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oai:figshare.com:article/34018341 2026-09-28T19:40:14Z category_26779 item_type_3 month_year_09_2026

Benchmark Matrix: Heat Pump Sub-Zero HSPF2 & Ambient COP Degradation Miad Saadidi (24671005) Mechanical engineering not elsewhere classified thermodynamics calculations show <p dir="ltr"># Heat Pump Sub-Zero HSPF2 & Ambient COP Degradation Benchmark Matrix</p><p><br></p><p dir="ltr">## 1. Overview & Physical Problem Background</p><p dir="ltr">Air-source heat pumps (ASHPs) experience non-linear thermal capacity collapse and Coefficient of Performance (COP) degradation as outdoor dry-bulb temperatures drop from nominal rating conditions (+47°F / 8.3°C) into deep sub-zero ambient regimes (-15°F / -26.1°C). </p><p><br></p><p dir="ltr">Under extreme cold conditions, standard single-stage and dual-stage inverters experience declining suction pressure, elevated compression ratios, and discharge temperature limits, triggering auxiliary electric resistance strip staging (5 kW to 15 kW elements). Conversely, cold-climate air-source heat pumps equipped with Enhanced Vapor Injection (ccASHP with EVI) maintain higher volumetric capacity and superior thermodynamic efficiency down to -15°F.</p><p><br></p><p dir="ltr">This benchmark dataset provides empirical and deterministic modeling data across 210 sub-freezing ambient temperature, compressor modulation, and system architecture points.</p><p><br></p><p>---</p><p><br></p><p dir="ltr">## 2. Tabular Schema & Variable Dictionary</p><p><br></p><p dir="ltr">| Field Name | Symbol | Unit | Type | Description |</p><p>| :--- | :--- | :--- | :--- | :--- |</p><p dir="ltr">| **Outdoor Ambient Temperature** | `T_amb` | °F / °C | Float | Dry-bulb outdoor ambient test temperature (-15°F to 47°F) |</p><p dir="ltr">| **Compressor Architecture** | `Arch` | String | String | Refrigeration platform: `Cold-Climate EVI` vs `Standard Inverter` |</p><p dir="ltr">| **Coefficient of Performance** | `COP` | Dimensionless | Float | Ratio of delivered sensible heating output to electrical energy input ($W_{th} / W_{elec}$) |</p><p dir="ltr">| **Heating Capacity Retention** | `Cap_ret` | % | Float | Delivered thermal capacity relative to nominal rating at 47°F |</p><p dir="ltr">| **Compressor Power Demand** | `P_comp` | kW | Float | Steady-state electrical power draw of compressor and outdoor fan |</p><p dir="ltr">| **Auxiliary Strip Power** | `Aux_kw` | kW | Float | Engaged secondary electric resistance element power staging |</p><p dir="ltr">| **Blended Hourly Operating Cost**| `Cost_hr` | $/hr | Float | Operating cost at U.S. national residential average tariff (18.34¢/kWh) |</p><p><br></p><p>---</p><p><br></p><p dir="ltr">## 3. Governing Standards & Methodology</p><p dir="ltr">* **AHRI Standard 210/240-2023:** *Performance Rating of Unitary Air-Conditioning & Air-Source Heat Pump Equipment*.</p><p dir="ltr">* **DOE 10 CFR Part 430, Subpart B, Appendix M1:** *Uniform Test Method for Measuring the Energy Consumption of Central Air Conditioners and Heat Pumps*.</p><p dir="ltr">* **NEEP ccASHP Specification:** *Northeast Energy Efficiency Partnerships Cold Climate Air-Source Heat Pump Performance Specification (v3.0)*.</p><p dir="ltr">* **ASHRAE Standard 90.1 / 103:** *Energy Standard for Buildings Except Low-Rise Residential Buildings*.</p><p><br></p><p>---</p><p><br></p><p dir="ltr">## 4. Canonical Replication & Interactive Model</p><p dir="ltr">* **Dataset Landing Page:** [https://www.powelab.org/datasets/heat-pump-sub-zero-cop-degradation-benchmark](https://www.powelab.org/datasets/heat-pump-sub-zero-cop-degradation-benchmark)</p><p dir="ltr">* **Interactive Heat Pump Sizing Engine:** [https://www.powelab.org/home-energy/heat-pump-cost-calculator](https://www.powelab.org/home-energy/heat-pump-cost-calculator)</p><p dir="ltr">* **Technical Whitepaper:** [https://www.powelab.org/research/heat-pump-cop-degradation-and-auxiliary-heat-kinetics](https://www.powelab.org/research/heat-pump-cop-degradation-and-auxiliary-heat-kinetics)</p> 2026-09-28T19:40:14Z Dataset Dataset 10.6084/m9.figshare.34018341.v1 https://figshare.com/articles/dataset/Benchmark_Matrix_Heat_Pump_Sub-Zero_HSPF2_Ambient_COP_Degradation/34018341 CC BY 4.0