fix: [Phase B.3] Fix free-floating temperature failures (#666)#677
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fix: [Phase B.3] Fix free-floating temperature failures (#666)#677
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- Disabled empirically-derived 6R2C correction factors (5.2, 1.74) - These factors were papering over calculation errors in h_tr_ms - Now using physics-based values directly Issue #665
- Remove incorrect 'if !ctf_primary' guard that was blocking CTF heat flux from zone air heat balance - CTF contribution now properly included in t_i_free calculation for ctf_primary cases (900FF, 950FF) - Result: Min temp improved from -8.10°C to -4.21°C (closer to reference -6.40 to -1.60°C) - Max temp changed from 81.27°C to 83.74°C (still far from reference 41.80-46.40°C - further work needed) Root cause: When ctf_primary=true, the CTF heat flux was being EXCLUDED from the zone air heat balance at line 1499, causing t_i_free to be calculated with the lumped 6R2C parameters instead of CTF's accurate thermal mass representation. Note: The max temperature issue persists (83°C vs 41-46°C target). This indicates additional thermal mass modeling issues beyond the scope of this fix. The ASHRAE 140 reference cases for 900FF require time constants of 120-200h, but current model produces ~26h.
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CTFSolver::new() initializes history with zero flux and uniform 20°C, causing unphysical heat flux values at simulation start for high-mass constructions (900FF, 950FF). Switch to with_warmup() which runs 7-day diurnal warmup cycles to establish realistic flux history before simulation begins. Tests: - test_ctf_wrapper_warmup_initializes_flux_history: verifies warmup - test_ctf_wrapper_without_warmup_vs_with_warmup: regression test Fixes #679
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Closing this PR - it contains the REGRESSION (6R2C factors set to 1.0, ctf_primary guard removed) instead of the correct fix. The proper fix has been merged via PR #687. |
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Summary
Fixes #666 and #679 by addressing two root causes of free-floating temperature failures in high-mass constructions (900FF, 950FF).
Issue #666 - CTF Flux Guard
When
ctf_primary=true, the CTF heat flux was being excluded from the zone air heat balance at line 1499 inthermal_model_physics.rs:Fix: Removed the
if !self.0.ctf_primaryguard so CTF heat flux is properly included.Issue #679 - Missing Warmup
CTFSolver::new()initialized history with zero flux and uniform 20°C, causing unphysical heat flux values at simulation start.Fix: Switched to
CTFSolver::with_warmup()which runs 7-day diurnal warmup cycles.Changes
src/physics/ctf_solver_wrapper.rs: ChangedCTFSolver::new()→CTFSolver::with_warmup(..., 20.0, 20.0, 7)src/sim/thermal_model_physics.rs: Removed incorrectif !ctf_primaryguardResults
Testing
test_ctf_wrapper_warmup_initializes_flux_historytest_ctf_wrapper_without_warmup_vs_with_warmup