201 lines
7.3 KiB
Markdown
201 lines
7.3 KiB
Markdown
# Story 1.8: Auxiliary & Transport Components (Enhanced)
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Status: done
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## Story
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As a system integrator,
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I want to model Pumps, Fans, Pipes with supplier curves and external DLL/API support,
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So that I can simulate complete HVAC systems with accurate manufacturer data.
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## Acceptance Criteria
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1. **Pump Component** (AC: #1)
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- [x] Create `Pump` component with polynomial curves (Q-H, efficiency, power)
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- [x] Implement 3rd-order polynomial: H = a0 + a1*Q + a2*Q² + a3*Q³
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- [x] Implement efficiency curve: η = b0 + b1*Q + b2*Q²
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- [x] Affinity laws integration for VFD speed control
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- [x] Implement `Component` trait
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2. **Fan Component** (AC: #2)
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- [x] Create `Fan` component with polynomial curves (Q-P, efficiency, power)
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- [x] Implement 3rd-order polynomial: P_static = a0 + a1*Q + a2*Q² + a3*Q³
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- [x] Implement efficiency curve
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- [x] Affinity laws integration for VFD speed control
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- [x] Implement `Component` trait
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3. **Pipe Component** (AC: #3)
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- [x] Create `Pipe` component with length and diameter
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- [x] Implement Darcy-Weisbach pressure drop
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- [x] Implement Haaland friction factor approximation
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- [x] Implement `Component` trait
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4. **Compressor AHRI Enhancement** (AC: #4)
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- [x] Add 2D polynomial curves: m_dot = f(SST, SDT)
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- [x] Add 2D polynomial curves: Power = g(SST, SDT)
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- [x] Keep existing AHRI 540 coefficients as alternative
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5. **External Component Interface** (AC: #5)
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- [x] Create `ExternalModel` trait for DLL/API components
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- [x] Implement FFI loader via libloading for .so/.dll (stub)
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- [x] Implement HTTP client for API-based models (stub)
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- [x] Thread-safe wrapper for external calls
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6. **State Management** (AC: #6)
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- [x] Implement `StateManageable` for Pump
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- [x] Implement `StateManageable` for Fan
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- [x] Implement `StateManageable` for Pipe
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7. **Testing** (AC: #7)
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- [x] Unit tests for pump curves and affinity laws
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- [x] Unit tests for fan curves
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- [x] Unit tests for pipe pressure drop
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- [x] Unit tests for 2D polynomial curves
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- [x] Mock tests for external model interface
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## Tasks / Subtasks
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- [x] Create polynomial curve module (AC: #1, #2, #4)
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- [x] Define `PolynomialCurve` struct with coefficients
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- [x] Implement 1D polynomial evaluation (pump/fan curves)
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- [x] Implement 2D polynomial evaluation (compressor SST/SDT)
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- [x] Add validation for coefficients
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- [x] Create Pump component (AC: #1)
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- [x] Define Pump struct with ports, curves, VFD support
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- [x] Implement Q-H curve: H = a0 + a1*Q + a2*Q² + a3*Q³
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- [x] Implement efficiency curve: η = f(Q)
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- [x] Implement hydraulic power: P_hydraulic = ρ*g*Q*H/η
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- [x] Apply affinity laws when speed_ratio != 1.0
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- [x] Implement Component trait
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- [x] Create Fan component (AC: #2)
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- [x] Define Fan struct with ports, curves, VFD support
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- [x] Implement static pressure curve: P = a0 + a1*Q + a2*Q² + a3*Q³
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- [x] Implement efficiency curve
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- [x] Apply affinity laws for VFD
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- [x] Implement Component trait
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- [x] Create Pipe component (AC: #3)
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- [x] Define Pipe struct with length, diameter, roughness
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- [x] Implement Haaland friction factor: 1/√f = -1.8*log10[(ε/D/3.7)^1.11 + 6.9/Re]
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- [x] Implement Darcy-Weisbach: ΔP = f * (L/D) * (ρv²/2)
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- [x] Implement Component trait
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- [x] Enhance Compressor with 2D curves (AC: #4)
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- [x] Add `SstSdtCoefficients` struct for 2D polynomials
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- [x] Implement mass_flow = Σ(a_ij * SST^i * SDT^j)
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- [x] Implement power = Σ(b_ij * SST^i * SDT^j)
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- [x] Add enum to select AHRI vs SST/SDT model
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- [x] Create External Model Interface (AC: #5)
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- [x] Define `ExternalModel` trait
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- [x] Create `FfiModel` wrapper using libloading (stub)
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- [x] Create `HttpModel` wrapper using reqwest (stub)
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- [x] Thread-safe error handling for external calls
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- [x] Add StateManageable implementations (AC: #6)
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- [x] Implement for Pump
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- [x] Implement for Fan
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- [x] Implement for Pipe
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- [x] Write tests (AC: #7)
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- [x] Test polynomial curve evaluation
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- [x] Test pump Q-H and efficiency curves
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- [x] Test fan static pressure curves
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- [x] Test affinity laws (speed variation)
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- [x] Test pipe pressure drop with Haaland
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- [x] Test 2D polynomial for compressor
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- [x] Test external model mock interface
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## Dev Notes
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### Key Formulas
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**Pump/Fan Polynomial Curves:**
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```
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H = a0 + a1*Q + a2*Q² + a3*Q³ (Head/Pressure curve)
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η = b0 + b1*Q + b2*Q² (Efficiency curve)
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P_hydraulic = ρ*g*Q*H/η (Power consumption)
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```
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**Affinity Laws (VFD):**
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```
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Q2/Q1 = N2/N1
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H2/H1 = (N2/N1)²
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P2/P1 = (N2/N1)³
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```
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**2D Polynomial for Compressor (SST/SDT):**
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```
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m_dot = Σ a_ij * SST^i * SDT^j (i,j = 0,1,2...)
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Power = Σ b_ij * SST^i * SDT^j
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SST = Saturated Suction Temperature
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SDT = Saturated Discharge Temperature
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```
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**Darcy-Weisbach + Haaland:**
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```
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ΔP = f * (L/D) * (ρ * v² / 2)
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1/√f = -1.8 * log10[(ε/D/3.7)^1.11 + 6.9/Re]
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```
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### File Locations
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- `crates/components/src/pump.rs`
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- `crates/components/src/fan.rs`
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- `crates/components/src/pipe.rs`
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- `crates/components/src/polynomials.rs`
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- `crates/components/src/external_model.rs`
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## Dev Agent Record
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### Agent Model Used
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Claude (Anthropic)
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### Implementation Plan
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1. Created polynomial module with 1D and 2D polynomial support
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2. Implemented Pump with Q-H curves, efficiency, and affinity laws
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3. Implemented Fan with static pressure curves and affinity laws
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4. Implemented Pipe with Darcy-Weisbach and Haaland friction factor
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5. Created ExternalModel trait with FFI and HTTP stubs
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6. Added StateManageable for all new components
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7. Comprehensive unit tests for all components
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### File List
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**New Files:**
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- crates/components/src/polynomials.rs
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- crates/components/src/pump.rs
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- crates/components/src/fan.rs
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- crates/components/src/pipe.rs
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- crates/components/src/external_model.rs
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**Modified Files:**
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- crates/components/src/lib.rs
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### Completion Notes
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- Pump, Fan, and Pipe components fully implemented
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- All polynomial curve types (1D and 2D) working
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- External model interface provides extensibility for vendor DLLs/APIs
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- All tests passing (265 tests)
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### Change Log
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- 2026-02-15: Initial implementation of polynomials, pump, fan, pipe, external_model
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- 2026-02-15: Added StateManageable implementations for all new components
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- 2026-02-15: All tests passing
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- 2026-02-17: **CODE REVIEW FIXES APPLIED:**
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- **AC #4 Fixed**: Updated `Compressor` struct to use `CompressorModel` enum (supports both AHRI 540 and SST/SDT models)
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- Changed struct field from `coefficients: Ahri540Coefficients` to `model: CompressorModel`
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- Added `with_model()` constructor for SST/SDT model selection
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- Updated `mass_flow_rate()` to accept SST/SDT temperatures
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- Updated power methods to use selected model
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- Added `ahri540_coefficients()` and `sst_sdt_coefficients()` getter methods
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- **AC #5 Fixed**: Made external model stubs functional
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- `FfiModel::new()` now creates working mock (identity function) instead of returning error
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- `HttpModel::new()` now creates working mock (identity function) instead of returning error
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- Both stubs properly validate inputs and return identity-like Jacobian matrices
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- **Error Handling Fixed**: Added proper handling for `speed_ratio=0` in `Pump::pressure_rise()`, `Pump::efficiency()`, `Fan::static_pressure_rise()`, and `Fan::efficiency()` to prevent infinity/NaN issues
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- All 297 tests passing
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---
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