Summary

Currently, the ASHRAE 140 validator only runs 8 cases (600, 610, 620, 630, 900, 910, 920, 930) but ASHRAE 140 specifies 18 test cases.

Missing Cases

Low Mass (600 series) - Missing:

• Case 640: Thermostat setback (heating set to 10°C overnight 23:00-07:00)
• Case 650: Night ventilation (fan ON 18:00-07:00, heating disabled)
• Case 600FF: Free-floating (no HVAC, track temperatures)
• Case 650FF: Free-floating with night ventilation

High Mass (900 series) - Missing:

• Case 940: Thermostat setback (same as 640 but high mass)
• Case 950: Night ventilation (same as 650 but high mass)
• Case 900FF: Free-floating (no HVAC, high mass)
• Case 950FF: Free-floating with night ventilation

Special Cases - Missing:

• Case 960: Sunspace (2-zone building with inter-zone coupling)
• Case 195: Solid conduction (no windows, no infiltration, no internal loads, bang-bang control)

Implementation Requirements

1. Free-Floating Mode: Implement HVAC mode where heating/cooling is disabled and zone temperatures are tracked (not controlled)

2. Thermostat Setback: Extend HvacSchedule to support time-based setpoint changes (already partially implemented in ashrae_140_cases.rs)

3. Night Ventilation: Implement scheduled ventilation fan that runs during specific hours (already defined in NightVentilation struct)

4. Multi-Zone Support: Case 960 requires 2-zone thermal model with inter-zone conductance through common wall

5. Case 195: Special case with:

   • No windows
   • No infiltration (0 ACH)
   • No internal loads (0 W)
   • Bang-bang control (heating = cooling = 20°C)

Current Status

• Case definitions exist in src/validation/ashrae_140_cases.rs ✅
• Validator only runs 8 cases in src/validation/ashrae_140_validator.rs ❌

Files to Modify

• src/validation/ashrae_140_validator.rs: Add missing cases to validation loop
• src/sim/engine.rs: May need free-floating mode support
• src/sim/schedule.rs: Verify thermostat setback works correctly
• src/sim/ventilation.rs: Verify night ventilation calculation

References

• ASHRAE 140-2023 standard
• Case specifications in docs/ASHRAE140_MVP_ROADMAP.md
• Case definitions in src/validation/ashrae_140_cases.rs