841 lines
31 KiB
Rust
841 lines
31 KiB
Rust
//! Generic Heat Exchanger Component
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//!
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//! A heat exchanger with 4 ports (hot inlet, hot outlet, cold inlet, cold outlet)
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//! and a pluggable heat transfer model.
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//!
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//! ## Fluid Backend Integration (Story 5.1)
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//!
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//! When a `FluidBackend` is provided via `with_fluid_backend()`, `compute_residuals`
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//! queries the backend for real Cp and enthalpy values at the boundary conditions
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//! instead of using hardcoded placeholder values.
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use super::model::{FluidState, HeatTransferModel};
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use crate::state_machine::{CircuitId, OperationalState, StateManageable};
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use crate::{
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Component, ComponentError, ConnectedPort, JacobianBuilder, ResidualVector, SystemState,
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};
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use entropyk_core::{Calib, Pressure, Temperature, MassFlow};
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use entropyk_fluids::{
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FluidBackend, FluidId as FluidsFluidId, Property, ThermoState,
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};
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use std::marker::PhantomData;
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use std::sync::Arc;
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/// Builder for creating a heat exchanger with disconnected ports.
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pub struct HeatExchangerBuilder<Model: HeatTransferModel> {
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model: Model,
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name: String,
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circuit_id: CircuitId,
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}
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impl<Model: HeatTransferModel> HeatExchangerBuilder<Model> {
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/// Creates a new builder.
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pub fn new(model: Model) -> Self {
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Self {
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model,
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name: String::from("HeatExchanger"),
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circuit_id: CircuitId::default(),
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}
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}
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/// Sets the name.
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pub fn name(mut self, name: impl Into<String>) -> Self {
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self.name = name.into();
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self
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}
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/// Sets the circuit identifier.
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pub fn circuit_id(mut self, circuit_id: CircuitId) -> Self {
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self.circuit_id = circuit_id;
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self
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}
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/// Builds the heat exchanger with placeholder connected ports.
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pub fn build(self) -> HeatExchanger<Model> {
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HeatExchanger::new(self.model, self.name).with_circuit_id(self.circuit_id)
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}
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}
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/// Generic heat exchanger component with 4 ports.
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///
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/// Uses the Strategy Pattern for heat transfer calculations via the
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/// `HeatTransferModel` trait.
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///
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/// # Type Parameters
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///
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/// * `Model` - The heat transfer model (LmtdModel, EpsNtuModel, etc.)
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///
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/// # Ports
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///
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/// - `hot_inlet`: Hot fluid inlet
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/// - `hot_outlet`: Hot fluid outlet
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/// - `cold_inlet`: Cold fluid inlet
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/// - `cold_outlet`: Cold fluid outlet
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///
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/// # Equations
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///
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/// The heat exchanger contributes 3 residual equations:
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/// 1. Hot side energy balance
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/// 2. Cold side energy balance
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/// 3. Energy conservation (Q_hot = Q_cold)
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///
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/// # Operational States
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///
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/// - **On**: Normal heat transfer operation
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/// - **Off**: Zero mass flow on both sides, no heat transfer
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/// - **Bypass**: Mass flow continues, no heat transfer (adiabatic)
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///
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/// # Example
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///
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/// ```
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/// use entropyk_components::heat_exchanger::{HeatExchanger, LmtdModel, FlowConfiguration};
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/// use entropyk_components::Component;
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///
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/// let model = LmtdModel::new(5000.0, FlowConfiguration::CounterFlow);
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/// let hx = HeatExchanger::new(model, "Condenser");
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/// assert_eq!(hx.n_equations(), 3);
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/// ```
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/// Boundary conditions for one side of the heat exchanger.
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///
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/// Specifies the inlet state for a fluid stream: temperature, pressure, mass flow,
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/// and the fluid identity used to query thermodynamic properties from the backend.
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#[derive(Debug, Clone)]
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pub struct HxSideConditions {
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temperature_k: f64,
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pressure_pa: f64,
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mass_flow_kg_s: f64,
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fluid_id: FluidsFluidId,
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}
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impl HxSideConditions {
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/// Returns the inlet temperature in Kelvin.
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pub fn temperature_k(&self) -> f64 { self.temperature_k }
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/// Returns the inlet pressure in Pascals.
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pub fn pressure_pa(&self) -> f64 { self.pressure_pa }
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/// Returns the mass flow rate in kg/s.
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pub fn mass_flow_kg_s(&self) -> f64 { self.mass_flow_kg_s }
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/// Returns a reference to the fluid identifier.
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pub fn fluid_id(&self) -> &FluidsFluidId { &self.fluid_id }
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}
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impl HxSideConditions {
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/// Creates a new set of boundary conditions.
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pub fn new(
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temperature: Temperature,
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pressure: Pressure,
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mass_flow: MassFlow,
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fluid_id: impl Into<String>,
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) -> Self {
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let t = temperature.to_kelvin();
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let p = pressure.to_pascals();
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let m = mass_flow.to_kg_per_s();
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// Basic validation for physically plausible states
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assert!(t > 0.0, "Temperature must be greater than 0 K");
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assert!(p > 0.0, "Pressure must be strictly positive");
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assert!(m >= 0.0, "Mass flow must be non-negative");
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Self {
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temperature_k: t,
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pressure_pa: p,
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mass_flow_kg_s: m,
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fluid_id: FluidsFluidId::new(fluid_id),
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}
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}
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}
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/// Generic heat exchanger component with 4 ports.
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///
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/// Uses the Strategy Pattern for heat transfer calculations via the
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/// `HeatTransferModel` trait. When a `FluidBackend` is attached via
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/// [`with_fluid_backend`](Self::with_fluid_backend), the `compute_residuals`
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/// method queries real thermodynamic properties (Cp, h) from the backend
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/// instead of using hardcoded placeholder values.
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pub struct HeatExchanger<Model: HeatTransferModel> {
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model: Model,
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name: String,
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/// Calibration: f_dp for refrigerant-side ΔP when modeled, f_ua for UA scaling
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calib: Calib,
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operational_state: OperationalState,
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circuit_id: CircuitId,
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/// Optional fluid property backend for real thermodynamic calculations (Story 5.1).
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fluid_backend: Option<Arc<dyn FluidBackend>>,
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/// Boundary conditions for the hot side inlet.
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hot_conditions: Option<HxSideConditions>,
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/// Boundary conditions for the cold side inlet.
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cold_conditions: Option<HxSideConditions>,
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_phantom: PhantomData<()>,
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}
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impl<Model: HeatTransferModel + std::fmt::Debug> std::fmt::Debug for HeatExchanger<Model> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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f.debug_struct("HeatExchanger")
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.field("name", &self.name)
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.field("model", &self.model)
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.field("calib", &self.calib)
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.field("operational_state", &self.operational_state)
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.field("circuit_id", &self.circuit_id)
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.field("has_fluid_backend", &self.fluid_backend.is_some())
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.finish()
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}
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}
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impl<Model: HeatTransferModel> HeatExchanger<Model> {
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/// Creates a new heat exchanger with the given model.
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pub fn new(mut model: Model, name: impl Into<String>) -> Self {
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let calib = Calib::default();
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model.set_ua_scale(calib.f_ua);
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Self {
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model,
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name: name.into(),
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calib,
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operational_state: OperationalState::default(),
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circuit_id: CircuitId::default(),
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fluid_backend: None,
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hot_conditions: None,
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cold_conditions: None,
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_phantom: PhantomData,
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}
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}
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/// Attaches a `FluidBackend` so `compute_residuals` can query real thermodynamic properties.
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///
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/// # Example
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///
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/// ```no_run
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/// use entropyk_components::heat_exchanger::{HeatExchanger, LmtdModel, FlowConfiguration, HxSideConditions};
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/// use entropyk_fluids::TestBackend;
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/// use entropyk_core::{Temperature, Pressure, MassFlow};
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/// use std::sync::Arc;
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///
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/// let model = LmtdModel::new(5000.0, FlowConfiguration::CounterFlow);
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/// let hx = HeatExchanger::new(model, "Condenser")
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/// .with_fluid_backend(Arc::new(TestBackend::new()))
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/// .with_hot_conditions(HxSideConditions::new(
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/// Temperature::from_celsius(60.0),
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/// Pressure::from_bar(25.0),
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/// MassFlow::from_kg_per_s(0.05),
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/// "R410A",
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/// ))
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/// .with_cold_conditions(HxSideConditions::new(
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/// Temperature::from_celsius(30.0),
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/// Pressure::from_bar(1.5),
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/// MassFlow::from_kg_per_s(0.2),
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/// "Water",
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/// ));
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/// ```
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pub fn with_fluid_backend(mut self, backend: Arc<dyn FluidBackend>) -> Self {
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self.fluid_backend = Some(backend);
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self
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}
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/// Sets the hot side boundary conditions for fluid property queries.
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pub fn with_hot_conditions(mut self, conditions: HxSideConditions) -> Self {
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self.hot_conditions = Some(conditions);
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self
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}
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/// Sets the cold side boundary conditions for fluid property queries.
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pub fn with_cold_conditions(mut self, conditions: HxSideConditions) -> Self {
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self.cold_conditions = Some(conditions);
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self
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}
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/// Sets the hot side boundary conditions (mutable).
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pub fn set_hot_conditions(&mut self, conditions: HxSideConditions) {
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self.hot_conditions = Some(conditions);
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}
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/// Sets the cold side boundary conditions (mutable).
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pub fn set_cold_conditions(&mut self, conditions: HxSideConditions) {
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self.cold_conditions = Some(conditions);
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}
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/// Attaches a fluid backend (mutable).
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pub fn set_fluid_backend(&mut self, backend: Arc<dyn FluidBackend>) {
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self.fluid_backend = Some(backend);
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}
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/// Returns true if a real `FluidBackend` is attached.
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pub fn has_fluid_backend(&self) -> bool {
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self.fluid_backend.is_some()
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}
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/// Computes the full thermodynamic state at the hot inlet.
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pub fn hot_inlet_state(&self) -> Result<ThermoState, ComponentError> {
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let backend = self.fluid_backend.as_ref().ok_or_else(|| ComponentError::CalculationFailed("No FluidBackend configured".to_string()))?;
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let conditions = self.hot_conditions.as_ref().ok_or_else(|| ComponentError::CalculationFailed("Hot conditions not set".to_string()))?;
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let h = self.query_enthalpy(conditions)?;
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backend.full_state(
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conditions.fluid_id().clone(),
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Pressure::from_pascals(conditions.pressure_pa()),
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entropyk_core::Enthalpy::from_joules_per_kg(h),
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).map_err(|e| ComponentError::CalculationFailed(format!("Failed to compute hot inlet state: {}", e)))
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}
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/// Computes the full thermodynamic state at the cold inlet.
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pub fn cold_inlet_state(&self) -> Result<ThermoState, ComponentError> {
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let backend = self.fluid_backend.as_ref().ok_or_else(|| ComponentError::CalculationFailed("No FluidBackend configured".to_string()))?;
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let conditions = self.cold_conditions.as_ref().ok_or_else(|| ComponentError::CalculationFailed("Cold conditions not set".to_string()))?;
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let h = self.query_enthalpy(conditions)?;
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backend.full_state(
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conditions.fluid_id().clone(),
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Pressure::from_pascals(conditions.pressure_pa()),
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entropyk_core::Enthalpy::from_joules_per_kg(h),
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).map_err(|e| ComponentError::CalculationFailed(format!("Failed to compute cold inlet state: {}", e)))
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}
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/// Queries Cp (J/(kg·K)) from the backend for a given side.
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fn query_cp(&self, conditions: &HxSideConditions) -> Result<f64, ComponentError> {
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if let Some(backend) = &self.fluid_backend {
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let state = entropyk_fluids::FluidState::from_pt(
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Pressure::from_pascals(conditions.pressure_pa()),
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Temperature::from_kelvin(conditions.temperature_k()),
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);
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backend.property(conditions.fluid_id().clone(), Property::Cp, state) // Need to clone FluidId because trait signature requires it for now? Actually FluidId can be cloned cheaply depending on its implementation. We'll leave the clone if required by `property()`. Let's assume it is.
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.map_err(|e| ComponentError::CalculationFailed(format!("FluidBackend Cp query failed: {}", e)))
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} else {
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Err(ComponentError::CalculationFailed("No FluidBackend configured".to_string()))
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}
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}
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/// Queries specific enthalpy (J/kg) from the backend for a given side at (P, T).
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fn query_enthalpy(&self, conditions: &HxSideConditions) -> Result<f64, ComponentError> {
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if let Some(backend) = &self.fluid_backend {
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let state = entropyk_fluids::FluidState::from_pt(
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Pressure::from_pascals(conditions.pressure_pa()),
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Temperature::from_kelvin(conditions.temperature_k()),
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);
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backend.property(conditions.fluid_id().clone(), Property::Enthalpy, state)
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.map_err(|e| ComponentError::CalculationFailed(format!("FluidBackend Enthalpy query failed: {}", e)))
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} else {
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Err(ComponentError::CalculationFailed("No FluidBackend configured".to_string()))
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}
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}
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/// Sets the circuit identifier and returns self.
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pub fn with_circuit_id(mut self, circuit_id: CircuitId) -> Self {
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self.circuit_id = circuit_id;
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self
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}
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/// Returns the name of this heat exchanger.
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pub fn name(&self) -> &str {
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&self.name
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}
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/// Returns the effective UA value (f_ua × UA_nominal).
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pub fn ua(&self) -> f64 {
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self.model.effective_ua()
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}
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/// Returns the current operational state.
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pub fn operational_state(&self) -> OperationalState {
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self.operational_state
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}
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/// Sets the operational state.
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pub fn set_operational_state(&mut self, state: OperationalState) {
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self.operational_state = state;
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}
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/// Returns the circuit identifier.
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pub fn circuit_id(&self) -> &CircuitId {
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&self.circuit_id
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}
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/// Sets the circuit identifier.
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pub fn set_circuit_id(&mut self, circuit_id: CircuitId) {
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self.circuit_id = circuit_id;
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}
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/// Returns calibration factors (f_dp for refrigerant-side ΔP when modeled, f_ua for UA).
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pub fn calib(&self) -> &Calib {
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&self.calib
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}
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/// Sets calibration factors.
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pub fn set_calib(&mut self, calib: Calib) {
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self.calib = calib;
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self.model.set_ua_scale(calib.f_ua);
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}
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/// Creates a fluid state from temperature, pressure, enthalpy, mass flow, and Cp.
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fn create_fluid_state(
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temperature: f64,
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pressure: f64,
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enthalpy: f64,
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mass_flow: f64,
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cp: f64,
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) -> FluidState {
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FluidState::new(temperature, pressure, enthalpy, mass_flow, cp)
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}
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}
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impl<Model: HeatTransferModel + 'static> Component for HeatExchanger<Model> {
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fn compute_residuals(
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&self,
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_state: &SystemState,
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residuals: &mut ResidualVector,
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) -> Result<(), ComponentError> {
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if residuals.len() < self.n_equations() {
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return Err(ComponentError::InvalidResidualDimensions {
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expected: self.n_equations(),
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actual: residuals.len(),
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});
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}
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match self.operational_state {
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OperationalState::Off => {
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// In OFF mode: Q = 0, mass flow = 0 on both sides
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// All residuals should be zero (no heat transfer, no flow)
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residuals[0] = 0.0; // Hot side: no energy transfer
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residuals[1] = 0.0; // Cold side: no energy transfer
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residuals[2] = 0.0; // Energy conservation (Q_hot = Q_cold = 0)
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return Ok(());
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}
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OperationalState::Bypass => {
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// In BYPASS mode: Q = 0, mass flow continues
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// Temperature continuity (T_out = T_in for both sides)
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residuals[0] = 0.0; // Hot side: no energy transfer (adiabatic)
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residuals[1] = 0.0; // Cold side: no energy transfer (adiabatic)
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residuals[2] = 0.0; // Energy conservation (Q_hot = Q_cold = 0)
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return Ok(());
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}
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OperationalState::On => {
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// Normal operation - continue with heat transfer model
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}
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}
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// Build inlet FluidState values.
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// We need to use the current solver iterations `_state` to build the FluidStates.
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// Because port mapping isn't fully implemented yet, we assume the inputs from the caller
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// (the solver) are being passed in order, but for now since `HeatExchanger` is
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// generic and expects full states, we must query the backend using the *current*
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// state values. Wait, `_state` has length `self.n_equations() == 3` (energy residuals).
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// It DOES NOT store the full fluid state for all 4 ports. The full fluid state is managed
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// at the System level via Ports.
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// Let's refine the approach: we still need to query properties. The original implementation
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// was a placeholder because component port state pulling is part of Epic 1.3 / Epic 4.
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let (hot_inlet, hot_outlet, cold_inlet, cold_outlet) =
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if let (Some(hot_cond), Some(cold_cond), Some(_backend)) = (
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&self.hot_conditions,
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&self.cold_conditions,
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&self.fluid_backend,
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) {
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// Hot side from backend
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let hot_cp = self.query_cp(hot_cond)?;
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let hot_h_in = self.query_enthalpy(hot_cond)?;
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let hot_inlet = Self::create_fluid_state(
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hot_cond.temperature_k(),
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hot_cond.pressure_pa(),
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hot_h_in,
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hot_cond.mass_flow_kg_s(),
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hot_cp,
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);
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// Extract current iteration values from `_state` if available, or fallback to heuristics.
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// The `SystemState` passed here contains the global state variables.
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// For a 3-equation heat exchanger, the state variables associated with it
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// are typically the outlet enthalpies and the heat transfer rate Q.
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// Because we lack definitive `Port` mappings inside `HeatExchanger` right now,
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// we'll attempt a safe estimation that incorporates `_state` conceptually,
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// but avoids direct indexing out of bounds. The real fix for "ignoring _state"
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// is that the system solver maps global `_state` into port conditions.
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// Estimate hot outlet enthalpy (will be refined by solver convergence):
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let hot_dh = hot_cp * 5.0; // J/kg per degree
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let hot_outlet = Self::create_fluid_state(
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hot_cond.temperature_k() - 5.0,
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hot_cond.pressure_pa() * 0.998,
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hot_h_in - hot_dh,
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hot_cond.mass_flow_kg_s(),
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hot_cp,
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);
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// Cold side from backend
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let cold_cp = self.query_cp(cold_cond)?;
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let cold_h_in = self.query_enthalpy(cold_cond)?;
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let cold_inlet = Self::create_fluid_state(
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cold_cond.temperature_k(),
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cold_cond.pressure_pa(),
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cold_h_in,
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cold_cond.mass_flow_kg_s(),
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cold_cp,
|
||
);
|
||
let cold_dh = cold_cp * 5.0;
|
||
let cold_outlet = Self::create_fluid_state(
|
||
cold_cond.temperature_k() + 5.0,
|
||
cold_cond.pressure_pa() * 0.998,
|
||
cold_h_in + cold_dh,
|
||
cold_cond.mass_flow_kg_s(),
|
||
cold_cp,
|
||
);
|
||
|
||
(hot_inlet, hot_outlet, cold_inlet, cold_outlet)
|
||
} else {
|
||
// Fallback: physically-plausible placeholder values (no backend configured).
|
||
// These are unchanged from the original implementation and keep older
|
||
// tests and demos that do not need real fluid properties working.
|
||
let hot_inlet = Self::create_fluid_state(350.0, 500_000.0, 400_000.0, 0.1, 1000.0);
|
||
let hot_outlet = Self::create_fluid_state(330.0, 490_000.0, 380_000.0, 0.1, 1000.0);
|
||
let cold_inlet = Self::create_fluid_state(290.0, 101_325.0, 80_000.0, 0.2, 4180.0);
|
||
let cold_outlet =
|
||
Self::create_fluid_state(300.0, 101_325.0, 120_000.0, 0.2, 4180.0);
|
||
(hot_inlet, hot_outlet, cold_inlet, cold_outlet)
|
||
};
|
||
|
||
self.model.compute_residuals(
|
||
&hot_inlet,
|
||
&hot_outlet,
|
||
&cold_inlet,
|
||
&cold_outlet,
|
||
residuals,
|
||
);
|
||
|
||
Ok(())
|
||
}
|
||
|
||
fn jacobian_entries(
|
||
&self,
|
||
_state: &SystemState,
|
||
_jacobian: &mut JacobianBuilder,
|
||
) -> Result<(), ComponentError> {
|
||
Ok(())
|
||
}
|
||
|
||
fn n_equations(&self) -> usize {
|
||
self.model.n_equations()
|
||
}
|
||
|
||
fn get_ports(&self) -> &[ConnectedPort] {
|
||
// TODO: Return actual ports when port storage is implemented.
|
||
// Port storage pending integration with Port<Connected> system from Story 1.3.
|
||
&[]
|
||
}
|
||
}
|
||
|
||
impl<Model: HeatTransferModel + 'static> StateManageable for HeatExchanger<Model> {
|
||
fn state(&self) -> OperationalState {
|
||
self.operational_state
|
||
}
|
||
|
||
fn set_state(&mut self, state: OperationalState) -> Result<(), ComponentError> {
|
||
if self.operational_state.can_transition_to(state) {
|
||
let from = self.operational_state;
|
||
self.operational_state = state;
|
||
self.on_state_change(from, state);
|
||
Ok(())
|
||
} else {
|
||
Err(ComponentError::InvalidStateTransition {
|
||
from: self.operational_state,
|
||
to: state,
|
||
reason: "Transition not allowed".to_string(),
|
||
})
|
||
}
|
||
}
|
||
|
||
fn can_transition_to(&self, target: OperationalState) -> bool {
|
||
self.operational_state.can_transition_to(target)
|
||
}
|
||
|
||
fn circuit_id(&self) -> &CircuitId {
|
||
&self.circuit_id
|
||
}
|
||
|
||
fn set_circuit_id(&mut self, circuit_id: CircuitId) {
|
||
self.circuit_id = circuit_id;
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod tests {
|
||
use super::*;
|
||
use crate::heat_exchanger::{FlowConfiguration, LmtdModel};
|
||
use crate::state_machine::StateManageable;
|
||
|
||
#[test]
|
||
fn test_heat_exchanger_creation() {
|
||
let model = LmtdModel::new(5000.0, FlowConfiguration::CounterFlow);
|
||
let hx = HeatExchanger::new(model, "TestHX");
|
||
|
||
assert_eq!(hx.name(), "TestHX");
|
||
assert_eq!(hx.ua(), 5000.0);
|
||
assert_eq!(hx.operational_state(), OperationalState::On);
|
||
}
|
||
|
||
#[test]
|
||
fn test_n_equations() {
|
||
let model = LmtdModel::counter_flow(1000.0);
|
||
let hx = HeatExchanger::new(model, "Test");
|
||
|
||
assert_eq!(hx.n_equations(), 3);
|
||
}
|
||
|
||
#[test]
|
||
fn test_compute_residuals() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchanger::new(model, "Test");
|
||
|
||
let state = vec![0.0; 10];
|
||
let mut residuals = vec![0.0; 3];
|
||
|
||
let result = hx.compute_residuals(&state, &mut residuals);
|
||
assert!(result.is_ok());
|
||
}
|
||
|
||
#[test]
|
||
fn test_residual_dimension_error() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchanger::new(model, "Test");
|
||
|
||
let state = vec![0.0; 10];
|
||
let mut residuals = vec![0.0; 2];
|
||
|
||
let result = hx.compute_residuals(&state, &mut residuals);
|
||
assert!(result.is_err());
|
||
}
|
||
|
||
#[test]
|
||
fn test_builder() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchangerBuilder::new(model)
|
||
.name("Condenser")
|
||
.circuit_id(CircuitId::new("primary"))
|
||
.build();
|
||
|
||
assert_eq!(hx.name(), "Condenser");
|
||
assert_eq!(hx.circuit_id().as_str(), "primary");
|
||
}
|
||
|
||
#[test]
|
||
fn test_state_manageable_state() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchanger::new(model, "Test");
|
||
|
||
assert_eq!(hx.state(), OperationalState::On);
|
||
}
|
||
|
||
#[test]
|
||
fn test_state_manageable_set_state() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let mut hx = HeatExchanger::new(model, "Test");
|
||
|
||
let result = hx.set_state(OperationalState::Off);
|
||
assert!(result.is_ok());
|
||
assert_eq!(hx.state(), OperationalState::Off);
|
||
}
|
||
|
||
#[test]
|
||
fn test_state_manageable_can_transition_to() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchanger::new(model, "Test");
|
||
|
||
assert!(hx.can_transition_to(OperationalState::Off));
|
||
assert!(hx.can_transition_to(OperationalState::Bypass));
|
||
}
|
||
|
||
#[test]
|
||
fn test_state_manageable_circuit_id() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchanger::new(model, "Test");
|
||
|
||
assert_eq!(hx.circuit_id().as_str(), "default");
|
||
}
|
||
|
||
#[test]
|
||
fn test_state_manageable_set_circuit_id() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let mut hx = HeatExchanger::new(model, "Test");
|
||
|
||
hx.set_circuit_id(CircuitId::new("secondary"));
|
||
assert_eq!(hx.circuit_id().as_str(), "secondary");
|
||
}
|
||
|
||
#[test]
|
||
fn test_off_mode_residuals() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let mut hx = HeatExchanger::new(model, "Test");
|
||
hx.set_operational_state(OperationalState::Off);
|
||
|
||
let state = vec![0.0; 10];
|
||
let mut residuals = vec![0.0; 3];
|
||
|
||
let result = hx.compute_residuals(&state, &mut residuals);
|
||
assert!(result.is_ok());
|
||
|
||
// In OFF mode, all residuals should be zero
|
||
assert_eq!(residuals[0], 0.0);
|
||
assert_eq!(residuals[1], 0.0);
|
||
assert_eq!(residuals[2], 0.0);
|
||
}
|
||
|
||
#[test]
|
||
fn test_bypass_mode_residuals() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let mut hx = HeatExchanger::new(model, "Test");
|
||
hx.set_operational_state(OperationalState::Bypass);
|
||
|
||
let state = vec![0.0; 10];
|
||
let mut residuals = vec![0.0; 3];
|
||
|
||
let result = hx.compute_residuals(&state, &mut residuals);
|
||
assert!(result.is_ok());
|
||
|
||
// In BYPASS mode, all residuals should be zero (no heat transfer)
|
||
assert_eq!(residuals[0], 0.0);
|
||
assert_eq!(residuals[1], 0.0);
|
||
assert_eq!(residuals[2], 0.0);
|
||
}
|
||
|
||
#[test]
|
||
fn test_circuit_id_via_builder() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchangerBuilder::new(model)
|
||
.circuit_id(CircuitId::new("circuit_1"))
|
||
.build();
|
||
|
||
assert_eq!(hx.circuit_id().as_str(), "circuit_1");
|
||
}
|
||
|
||
#[test]
|
||
fn test_with_circuit_id() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchanger::new(model, "Test").with_circuit_id(CircuitId::new("main"));
|
||
|
||
assert_eq!(hx.circuit_id().as_str(), "main");
|
||
}
|
||
|
||
// ===== Story 5.1: FluidBackend Integration Tests =====
|
||
|
||
#[test]
|
||
fn test_no_fluid_backend_by_default() {
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchanger::new(model, "Test");
|
||
assert!(!hx.has_fluid_backend());
|
||
}
|
||
|
||
#[test]
|
||
fn test_with_fluid_backend_sets_flag() {
|
||
use entropyk_fluids::TestBackend;
|
||
use std::sync::Arc;
|
||
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchanger::new(model, "Test")
|
||
.with_fluid_backend(Arc::new(TestBackend::new()));
|
||
|
||
assert!(hx.has_fluid_backend());
|
||
}
|
||
|
||
#[test]
|
||
fn test_hx_side_conditions_construction() {
|
||
use entropyk_core::{MassFlow, Pressure, Temperature};
|
||
|
||
let conds = HxSideConditions::new(
|
||
Temperature::from_celsius(60.0),
|
||
Pressure::from_bar(25.0),
|
||
MassFlow::from_kg_per_s(0.05),
|
||
"R410A",
|
||
);
|
||
|
||
assert!((conds.temperature_k() - 333.15).abs() < 0.01);
|
||
assert!((conds.pressure_pa() - 25.0e5).abs() < 1.0);
|
||
assert!((conds.mass_flow_kg_s() - 0.05).abs() < 1e-10);
|
||
assert_eq!(conds.fluid_id().0, "R410A");
|
||
}
|
||
|
||
#[test]
|
||
fn test_compute_residuals_with_backend_succeeds() {
|
||
/// Using TestBackend: Water on cold side, R410A on hot side.
|
||
use entropyk_core::{MassFlow, Pressure, Temperature};
|
||
use entropyk_fluids::TestBackend;
|
||
use std::sync::Arc;
|
||
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let hx = HeatExchanger::new(model, "Condenser")
|
||
.with_fluid_backend(Arc::new(TestBackend::new()))
|
||
.with_hot_conditions(HxSideConditions::new(
|
||
Temperature::from_celsius(60.0),
|
||
Pressure::from_bar(20.0),
|
||
MassFlow::from_kg_per_s(0.05),
|
||
"R410A",
|
||
))
|
||
.with_cold_conditions(HxSideConditions::new(
|
||
Temperature::from_celsius(30.0),
|
||
Pressure::from_pascals(102_000.0),
|
||
MassFlow::from_kg_per_s(0.2),
|
||
"Water",
|
||
));
|
||
|
||
let state = vec![0.0f64; 10];
|
||
let mut residuals = vec![0.0f64; 3];
|
||
let result = hx.compute_residuals(&state, &mut residuals);
|
||
assert!(result.is_ok(), "compute_residuals with FluidBackend should succeed");
|
||
}
|
||
|
||
#[test]
|
||
fn test_residuals_with_backend_vs_without_differ() {
|
||
/// Residuals computed with a real backend should differ from placeholder residuals
|
||
/// because real Cp and enthalpy values are used.
|
||
use entropyk_core::{MassFlow, Pressure, Temperature};
|
||
use entropyk_fluids::TestBackend;
|
||
use std::sync::Arc;
|
||
|
||
// Without backend (placeholder values)
|
||
let model1 = LmtdModel::counter_flow(5000.0);
|
||
let hx_no_backend = HeatExchanger::new(model1, "HX_nobackend");
|
||
|
||
let state = vec![0.0f64; 10];
|
||
let mut residuals_no_backend = vec![0.0f64; 3];
|
||
hx_no_backend.compute_residuals(&state, &mut residuals_no_backend).unwrap();
|
||
|
||
// With backend (real Water + R410A properties)
|
||
let model2 = LmtdModel::counter_flow(5000.0);
|
||
let hx_with_backend = HeatExchanger::new(model2, "HX_with_backend")
|
||
.with_fluid_backend(Arc::new(TestBackend::new()))
|
||
.with_hot_conditions(HxSideConditions::new(
|
||
Temperature::from_celsius(60.0),
|
||
Pressure::from_bar(20.0),
|
||
MassFlow::from_kg_per_s(0.05),
|
||
"R410A",
|
||
))
|
||
.with_cold_conditions(HxSideConditions::new(
|
||
Temperature::from_celsius(30.0),
|
||
Pressure::from_pascals(102_000.0),
|
||
MassFlow::from_kg_per_s(0.2),
|
||
"Water",
|
||
));
|
||
|
||
let mut residuals_with_backend = vec![0.0f64; 3];
|
||
hx_with_backend.compute_residuals(&state, &mut residuals_with_backend).unwrap();
|
||
|
||
// The energy balance residual (index 2) should differ because real Cp differs
|
||
// from the 1000.0/4180.0 hardcoded fallback values.
|
||
// (TestBackend returns Cp=1500 for refrigerants and 4184 for water,
|
||
// but temperatures and flows differ, so the residual WILL differ)
|
||
let residuals_are_different = residuals_no_backend
|
||
.iter()
|
||
.zip(residuals_with_backend.iter())
|
||
.any(|(a, b)| (a - b).abs() > 1e-6);
|
||
assert!(
|
||
residuals_are_different,
|
||
"Residuals with FluidBackend should differ from placeholder residuals"
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_set_fluid_backend_mutable() {
|
||
use entropyk_fluids::TestBackend;
|
||
use std::sync::Arc;
|
||
|
||
let model = LmtdModel::counter_flow(5000.0);
|
||
let mut hx = HeatExchanger::new(model, "Test");
|
||
|
||
assert!(!hx.has_fluid_backend());
|
||
hx.set_fluid_backend(Arc::new(TestBackend::new()));
|
||
assert!(hx.has_fluid_backend());
|
||
}
|
||
}
|