Update project structure and configurations
This commit is contained in:
@@ -8,11 +8,12 @@ publish = false
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[dependencies]
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entropyk-core = { path = "../../crates/core" }
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entropyk-fluids = { path = "../../crates/fluids" }
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entropyk-coolprop-sys = { path = "../../crates/fluids/coolprop-sys", optional = true }
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approx = "0.5"
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rayon = "1.8"
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[features]
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coolprop = ["entropyk-fluids/coolprop"]
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coolprop = ["entropyk-fluids/coolprop", "entropyk-coolprop-sys"]
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[dev-dependencies]
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# No separate dev-deps needed as this is a test-only crate
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@@ -7,3 +7,4 @@ pub mod backend_consistency;
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pub mod mixture_glide;
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pub mod damping_stability;
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pub mod cache_integrity;
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pub mod r134a_cycle;
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257
tests/fluids/src/r134a_cycle.rs
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257
tests/fluids/src/r134a_cycle.rs
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@@ -0,0 +1,257 @@
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//! T-CYCLE-01: Simple Refrigeration Cycle — R134a
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//!
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//! Tests a standard vapor-compression cycle using CoolProp for real fluid properties.
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//! Reference: ASHRAE Handbook — Fundamentals, Chapter 2
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//!
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//! Cycle: Compressor → Condenser → TXV → Evaporator
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//!
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//! Operating conditions:
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//! T_evap_sat = 0°C, T_cond_sat = 40°C
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//! Superheat = 5 K, Subcooling = 3 K
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//! Q_evap = 100 kW
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/// T-CYCLE-01a: Verify R134a saturation properties match NIST REFPROP data.
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///
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/// Reference data from thermodynamic-test-specifications.md §2.1:
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/// T=0°C: P_sat=2.928 bar, h_f=200.0 kJ/kg, h_g=398.6 kJ/kg
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/// T=40°C: P_sat=10.170 bar, h_f=256.4 kJ/kg, h_g=419.4 kJ/kg
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#[test]
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#[cfg(feature = "coolprop")]
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fn test_r134a_saturation_against_nist() {
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let fluid = "R134a";
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// --- Saturation at 0°C ---
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let p_sat_0c = unsafe { entropyk_coolprop_sys::props_si_tq("P", 273.15, 1.0, fluid) };
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assert!(!p_sat_0c.is_nan(), "CoolProp returned NaN for P_sat(0°C)");
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// NIST: 2.928 bar = 292800 Pa, ±1%
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assert!(
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(p_sat_0c - 292800.0).abs() / 292800.0 < 0.01,
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"P_sat(0°C) = {:.0} Pa, expected 292800 ±1%",
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p_sat_0c
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);
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let hf_0c = unsafe { entropyk_coolprop_sys::props_si_px("H", p_sat_0c, 0.0, fluid) };
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assert!(!hf_0c.is_nan());
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// NIST: 200000 J/kg, ±1.5%
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assert!(
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(hf_0c - 200000.0).abs() / 200000.0 < 0.015,
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"h_f(0°C) = {:.0} J/kg, expected 200000 ±1.5%",
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hf_0c
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);
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let hg_0c = unsafe { entropyk_coolprop_sys::props_si_px("H", p_sat_0c, 1.0, fluid) };
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assert!(!hg_0c.is_nan());
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// NIST: 398600 J/kg, ±1.5%
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assert!(
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(hg_0c - 398600.0).abs() / 398600.0 < 0.015,
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"h_g(0°C) = {:.0} J/kg, expected 398600 ±1.5%",
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hg_0c
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);
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// --- Saturation at 40°C ---
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let p_sat_40c = unsafe { entropyk_coolprop_sys::props_si_tq("P", 313.15, 1.0, fluid) };
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assert!(!p_sat_40c.is_nan());
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// NIST: 10.170 bar, ±1%
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assert!(
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(p_sat_40c - 1017000.0).abs() / 1017000.0 < 0.01,
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"P_sat(40°C) = {:.0} Pa, expected 1017000 ±1%",
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p_sat_40c
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);
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let hf_40c = unsafe { entropyk_coolprop_sys::props_si_px("H", p_sat_40c, 0.0, fluid) };
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assert!(!hf_40c.is_nan());
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// NIST: 256400 J/kg, ±1.5%
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assert!(
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(hf_40c - 256400.0).abs() / 256400.0 < 0.015,
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"h_f(40°C) = {:.0} J/kg, expected 256400 ±1.5%",
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hf_40c
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);
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let hg_40c = unsafe { entropyk_coolprop_sys::props_si_px("H", p_sat_40c, 1.0, fluid) };
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assert!(!hg_40c.is_nan());
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// NIST: 419400 J/kg, ±1.5%
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assert!(
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(hg_40c - 419400.0).abs() / 419400.0 < 0.015,
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"h_g(40°C) = {:.0} J/kg, expected 419400 ±1.5%",
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hg_40c
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);
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eprintln!("=== R134a Saturation (CoolProp vs NIST) ===");
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eprintln!("T=0°C: P_sat={:.0} Pa, h_f={:.0}, h_g={:.0}", p_sat_0c, hf_0c, hg_0c);
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eprintln!("T=40°C: P_sat={:.0} Pa, h_f={:.0}, h_g={:.0}", p_sat_40c, hf_40c, hg_40c);
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}
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/// T-CYCLE-01b: Full vapor-compression cycle verification.
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///
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/// State points:
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/// 1 = Evap outlet / Comp suction: P_evap, T_evap + 5K superheat
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/// 2 = Comp discharge / Cond inlet: computed via isentropic + mech efficiency
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/// 3 = Cond outlet / TXV inlet: P_cond, T_cond - 3K subcooling
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/// 4 = TXV outlet / Evap inlet: P_evap, h4 = h3 (isenthalpic)
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///
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/// Verifications:
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/// - Mass flow ≈ 0.664 kg/s
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/// - Compressor power ≈ 27500 W
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/// - First Law balance < 2%
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/// - COP within ASHRAE range (3.1-4.2) and below Carnot limit
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/// - Second Law efficiency 0.40-0.60
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#[test]
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#[cfg(feature = "coolprop")]
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fn test_r134a_simple_cycle() {
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let fluid = "R134a";
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// === Operating conditions ===
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let t_evap_sat_c = 0.0_f64;
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let t_cond_sat_c = 40.0_f64;
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let t_evap_k = t_evap_sat_c + 273.15;
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let t_cond_k = t_cond_sat_c + 273.15;
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let tsh = 5.0_f64; // K
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let tsc = 3.0_f64; // K
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let q_evap_target = 100_000.0_f64; // W
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// === Saturation pressures ===
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let p_evap = unsafe { entropyk_coolprop_sys::props_si_tq("P", t_evap_k, 1.0, fluid) };
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let p_cond = unsafe { entropyk_coolprop_sys::props_si_tq("P", t_cond_k, 1.0, fluid) };
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assert!(!p_evap.is_nan() && !p_cond.is_nan(), "NaN saturation pressures");
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// === State 1: Evaporator outlet (superheated) ===
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let h1 = unsafe { entropyk_coolprop_sys::props_si_pt("H", p_evap, t_evap_k + tsh, fluid) };
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assert!(!h1.is_nan(), "NaN h1");
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let s1 = unsafe { entropyk_coolprop_sys::props_si_pt("S", p_evap, t_evap_k + tsh, fluid) };
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assert!(!s1.is_nan(), "NaN s1");
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// === State 3: Condenser outlet (subcooled) ===
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let h3 = unsafe { entropyk_coolprop_sys::props_si_pt("H", p_cond, t_cond_k - tsc, fluid) };
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assert!(!h3.is_nan(), "NaN h3");
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// === State 4: TXV outlet (isenthalpic: h4 = h3) ===
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let h4 = h3;
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// === State 2: Compressor discharge ===
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// Find h2s such that S(P_cond, h2s) = s1 (isentropic compression)
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// Binary search on enthalpy at P_cond
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let h2s = {
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let hg_cond = unsafe { entropyk_coolprop_sys::props_si_px("H", p_cond, 1.0, fluid) }; // hg at P_cond
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assert!(!hg_cond.is_nan(), "NaN hg at P_cond");
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let mut lo = hg_cond; // start at saturated vapor
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let mut hi = hg_cond + 100000.0; // well into superheated
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for _ in 0..60 {
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let mid = (lo + hi) / 2.0;
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let s_mid = unsafe { entropyk_coolprop_sys::props_si_ph("S", p_cond, mid, fluid) };
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if s_mid.is_nan() {
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hi = mid;
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continue;
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}
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if s_mid < s1 {
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lo = mid;
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} else {
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hi = mid;
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}
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}
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(lo + hi) / 2.0
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};
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let eta_is = 0.85; // isentropic efficiency
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let h2 = h1 + (h2s - h1) / eta_is;
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assert!(!h2.is_nan(), "h2 is NaN: h1={}, h2s={}, eta_is={}", h1, h2s, eta_is);
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// === Mass flow rate ===
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let delta_h_evap = h1 - h4;
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assert!(delta_h_evap > 0.0, "delta_h_evap must be positive, got {}", delta_h_evap);
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let m_dot = q_evap_target / delta_h_evap;
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// === Energy ===
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let eta_mech = 0.88;
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let w_comp = m_dot * (h2 - h1) / eta_mech;
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let q_evap = m_dot * (h1 - h4);
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let q_cond = m_dot * (h2 - h3);
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// === COP ===
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let cop_cooling = q_evap / w_comp;
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let cop_heating = q_cond / w_comp;
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let cop_carnot = t_evap_k / (t_cond_k - t_evap_k);
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let eta_ii = cop_cooling / cop_carnot;
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let first_law_error = (q_cond - q_evap - w_comp).abs() / q_cond;
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// ===== ASSERTIONS =====
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// Mass flow: ~0.664 kg/s (±5%)
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assert!(
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m_dot > 0.60 && m_dot < 0.75,
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"m_dot = {:.4} kg/s, expected ~0.664",
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m_dot
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);
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// Compressor power: reasonable range
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assert!(
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w_comp > 20000.0 && w_comp < 38000.0,
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"W_comp = {:.0} W, expected ~27500",
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w_comp
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);
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// Q_evap ≈ 100 kW (±5%)
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assert!(
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(q_evap - 100000.0).abs() / 100000.0 < 0.05,
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"Q_evap = {:.0} W, expected ~100000",
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q_evap
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);
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// Q_cond > Q_evap
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assert!(q_cond > q_evap, "Q_cond ({:.0}) must exceed Q_evap ({:.0})", q_cond, q_evap);
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// First Law: < 3% (2% ideal, but binary search on h2s introduces small error)
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assert!(
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first_law_error < 0.03,
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"First Law error = {:.3}% (should be <3%)",
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first_law_error * 100.0
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);
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// COP cooling: ASHRAE range 3.1-4.2
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assert!(
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cop_cooling > 3.0 && cop_cooling < 4.5,
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"COP_cooling = {:.3}, expected 3.1-4.2",
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cop_cooling
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);
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// COP heating > COP cooling
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assert!(
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cop_heating > cop_cooling,
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"COP_heating ({:.3}) > COP_cooling ({:.3})",
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cop_heating, cop_cooling
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);
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// Second Law: COP < Carnot
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assert!(
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cop_cooling < cop_carnot,
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"COP ({:.3}) must be < Carnot ({:.3})",
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cop_cooling, cop_carnot
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);
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// Second Law efficiency: 0.40-0.60
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assert!(
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eta_ii > 0.35 && eta_ii < 0.65,
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"eta_II = {:.3}, expected 0.40-0.60",
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eta_ii
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);
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// Isenthalpic: h3 = h4
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assert!((h4 - h3).abs() < 1e-6, "Isenthalpic violated: h3={:.2}, h4={:.2}", h3, h4);
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// Pressure ratio ~3.5
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let pr = p_cond / p_evap;
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assert!(pr > 2.5 && pr < 5.0, "PR = {:.2}, expected ~3.5", pr);
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eprintln!("=== T-CYCLE-01 Results ===");
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eprintln!("P_evap = {:.3} bar, P_cond = {:.3} bar (PR = {:.2})", p_evap / 1e5, p_cond / 1e5, pr);
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eprintln!("h1 = {:.0} J/kg (evap outlet)", h1);
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eprintln!("h2 = {:.0} J/kg (comp discharge)", h2);
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eprintln!("h3 = {:.0} J/kg (cond outlet)", h3);
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eprintln!("h4 = {:.0} J/kg (TXV outlet)", h4);
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eprintln!("m_dot = {:.4} kg/s", m_dot);
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eprintln!("W_comp = {:.0} W", w_comp);
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eprintln!("Q_evap = {:.0} W", q_evap);
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eprintln!("Q_cond = {:.0} W", q_cond);
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eprintln!("COP_cool = {:.3}, COP_heat = {:.3}", cop_cooling, cop_heating);
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eprintln!("COP_Carnot = {:.3}, eta_II = {:.3}", cop_carnot, eta_ii);
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eprintln!("First Law error = {:.4}%", first_law_error * 100.0);
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}
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