Cold-Climate Heat Pump COP Derating & Heating Load Balance Point Dataset
Empirical and thermodynamic performance matrix modeling variable-speed inverter air-source heat pumps. The dataset evaluates compressor capacity retention, Coefficient of Performance (COP) degradation, latent defrost penalties, building heating balance points, and auxiliary electric resistance strip staging requirements.
đŦ Dataset Methodology & Engineering Basis
Simulations model residential heating loads per ACCA Manual J and heat pump capacity curves conforming to AHRI 210/240 and NEEP cold-climate specifications. Defrost degradation is modeled below 40°F with dynamic frost accumulation curves and timed reverse-cycle penalties.
Governing Engineering Standards & Codes:
đ Tabular Data Preview (First 5 Rows)
Displaying 5 of 240 rows| Record_ID | Outdoor_Temp_degF | Indoor_Temp_degF | Nominal_Tonnage | Operating_COP | Effective_Heating_Cap_Btu_hr | Building_Heat_Demand_Btu_hr | Aux_Electric_Heat_kW | Balance_Point_Status |
|---|---|---|---|---|---|---|---|---|
| HL-HP-0001 | -15 | 70 | 2 | 1.4 | 10800 | 27200 | 4.81 | below_balance_point |
| HL-HP-0002 | -10 | 70 | 2 | 1.63 | 12360 | 25600 | 3.88 | below_balance_point |
| HL-HP-0003 | -5 | 70 | 2 | 1.85 | 13920 | 24000 | 2.95 | below_balance_point |
| HL-HP-0004 | 0 | 70 | 2 | 2.07 | 15480 | 22400 | 2.03 | below_balance_point |
| HL-HP-0005 | 5 | 70 | 2 | 2.3 | 17040 | 20800 | 1.1 | below_balance_point |
đ Data Dictionary & Variable Definitions
Complete schema definition describing each column, engineering unit of measure, data type, and thermodynamic description:
| Variable Name | Data Type | Unit | Engineering Description |
|---|---|---|---|
| Record_ID | string | â | Unique simulation vector identifier (HL-HP-0001 to HL-HP-0240) |
| Outdoor_Temp_degF | number | °F | Outdoor ambient dry-bulb temperature (-15.0°F to 50.0°F) |
| Indoor_Temp_degF | number | °F | Conditioned space indoor design setpoint (70.0°F) |
| Design_Heat_Loss_Btu_hr | number | BTU/h | Building envelope peak design heating load |
| Nominal_Tonnage | number | Tons | Heat pump nominal equipment frame (2.0 to 5.0 Tons) |
| Rated_Heating_Cap_47F_Btu | number | BTU/h | Rated heating capacity at AHRI 47°F rating point |
| Compressor_Speed | string | â | Inverter operating state (min, intermediate, max) |
| Operating_COP | number | ratio | Instantaneous thermodynamic Coefficient of Performance |
| Gross_Heating_Cap_Btu_hr | number | BTU/h | Uncorrected compressor thermal output before defrost derate |
| Defrost_Derate_Factor | number | fraction | Latent frost accumulation penalty factor (0.82 to 1.00) |
| Effective_Heating_Cap_Btu_hr | number | BTU/h | Net deliverable heating power to building envelope |
| Building_Heat_Demand_Btu_hr | number | BTU/h | Envelope thermal loss demand at current ambient temperature |
| Thermal_Deficit_Btu_hr | number | BTU/h | Unmet heating demand below thermal balance point |
| Aux_Electric_Heat_kW | number | kW | Electric resistance backup heat required to maintain indoor temperature |
| Balance_Point_Status | string | â | Regime classification (above_balance_point, below_balance_point) |
𧎠Interactive Companion Calculators
Test and explore these mathematical models dynamically in our client-side calculators:
Calculate thermal balance point, low-ambient COP derating, and backup heat staging.
đ Companion Research Whitepapers
Read the full mathematical derivations and thermodynamic proofs:
Thermodynamic modeling of cold-climate inverter derating, balance points, and auxiliary loads.
đ Academic Citation & Replication
When referencing this benchmark dataset in academic publications, university course syllabi, or engineering technical reports, please cite as follows:
BibTeX Entry:
@dataset{hvaclogic_cold_climate_heat_pump_cop_derating,
author = {{HVACLogic Open Engineering Research Group}},
title = {Cold-Climate Heat Pump COP Derating & Heating Load Balance Point Dataset},
year = {2026},
publisher = {HVACLogic Open Science},
url = {https://hvaclogic.org/datasets/cold-climate-heat-pump-cop-derating},
doi = {10.6084/m9.figshare.33477430}
}