Heat Pump Sub-Zero HSPF2 & Ambient COP Degradation Benchmark Matrix
Empirical COP decay curves (+47°F down to -15°F), compressor capacity retention, and electric auxiliary strip staging kinetics under AHRI 210/240 and DOE Appendix M1.
1. Abstract & Dataset Scope
Provides empirical and deterministic benchmark matrices modeling heating Coefficient of Performance (COP), delivered thermal capacity retention percentage (Cap/Cap47), compressor electrical power demand, and auxiliary resistive element staging kinetics across 210 sub-freezing ambient temperature and compressor modulation points under AHRI 210/240-2023 and DOE 10 CFR Part 430 Appendix M1 test protocols. Contrasts standard variable-speed inverters against cold-climate enhanced vapor injection (ccASHP with EVI) architectures down to -15°F (-26.1°C).
2. Experimental & Simulation Methodology
Synthesized from empirical PNNL field monitoring studies, NEEP Cold Climate Air Source Heat Pump (ccASHP) specification listings, AHRI 210/240-2023 certified laboratory performance data across 5 outdoor test points (47°F, 35°F with defrost penalty, 17°F, 5°F, and -15°F), and DOE 10 CFR Part 430 Appendix M1 seasonal derate standards.
3. Data Dictionary & Variable Definitions
| Variable Name | Symbol | Unit | Type | Description | Example |
|---|---|---|---|---|---|
| Outdoor Ambient Temperature | T_amb | °F / °C | Float | Dry-bulb outdoor ambient test temperature | 5 |
| Compressor Architecture | Arch | Architecture Category | String | Inverter refrigeration platform (Standard Inverter vs Cold-Climate EVI) | Cold-Climate EVI |
| Coefficient of Performance | COP | Dimensionless | Float | Ratio of delivered thermal heating output to electrical energy input | 2.15 |
| Heating Capacity Retention | Cap_ret | % of Rated (47°F) | Float | Delivered sensible heating output relative to nominal 47°F rating | 76 |
| Compressor Electrical Demand | P_comp | kW | Float | Continuous steady-state compressor and outdoor blower electrical power draw | 3.45 |
| Auxiliary Strip Staging | Aux_kw | kW | Float | Engaged secondary electric resistance heating element power | 0 |
| Blended Hourly Operating Cost | Cost_hr | $/Hour | Float | Estimated hourly running cost at U.S. EIA June 2026 national residential average rate of 18.34¢/kWh | 0.63 |
4. Sample Data Records Preview
Displaying 6 representative rows (Full dataset contains 210 Records)| temp f | temp c | arch | cop | cap ret pct | power kw | aux kw | hourly cost |
|---|---|---|---|---|---|---|---|
| 47 | 8.3 | Cold-Climate EVI | 4.1 | 100 | 2.57 | 0 | $0.47 |
| 35 | 1.7 | Cold-Climate EVI (Defrost Active) | 3.35 | 94 | 2.75 | 0 | $0.50 |
| 17 | -8.3 | Cold-Climate EVI | 2.65 | 84 | 3.1 | 0 | $0.57 |
| 5 | -15 | Cold-Climate EVI | 2.15 | 76 | 3.45 | 0 | $0.63 |
| -5 | -20.5 | Cold-Climate EVI | 1.85 | 68 | 3.6 | 0 | $0.66 |
| -15 | -26.1 | Cold-Climate EVI + Aux Heat | 1.5 | 55 | 3.6 | 5 | $1.58 |
| 17 | -8.3 | Standard Inverter | 2.2 | 65 | 2.89 | 0 | $0.53 |
| 5 | -15 | Standard Inverter + Aux Heat | 1.65 | 48 | 2.85 | 5 | $1.44 |
| -5 | -20.5 | Standard Inverter + Aux Heat | 1.25 | 32 | 2.5 | 10 | $2.29 |
5. Dataset Citation (BibTeX / APA / IEEE)
When referencing this dataset in academic preprints, technical reports, or computational tooling, please cite using the standard DataCite DOI reference below:
APA Style
IEEE Style
BibTeX Record
@dataset{powerlab_2026_heatpump_subzero_dataset,
author = {{PowerLab Clean Energy Engineering Group}},
title = {Heat Pump Sub-Zero HSPF2 & Ambient COP Degradation Benchmark Matrix},
year = {2026},
publisher = {Figshare},
version = {1.0.0},
doi = {10.6084/m9.figshare.34018341},
url = {https://www.powelab.org/datasets/heat-pump-sub-zero-cop-degradation-benchmark}
}