Heat Pump Performance: ground_source
Heat pump COP and capacity fraction data as a function of outdoor temperature (air-source) or entering water temperature (ground/water-source) — covers air-source heating/cooling, cold-climate ASHP, ground-source, and water-source heat pumps
| heat pump type | outdoor temp F | capacity fraction (dimensionless) | cop (dimensionless) | notes | power input kW (kW) |
|---|---|---|---|---|---|
| ground_source | 20 | 0.65 | 2.6 | Ground-source heating; EWT 20F; requires anti-freeze in loop (propylene glycol 30%+); marginal loop condition indicating thermal depletion; COP drops significantly; loop upsizing recommended | 4.4 |
| ground_source | 30 | 0.78 | 3.2 | EWT 30F; marginal loop condition; anti-freeze (propylene glycol 20%) required below 32F EWT | 4.29 |
| ground_source | 40 | 0.9 | 3.8 | EWT 40F; colder loop reduces COP; typical late-winter condition in northern climates | 4.16 |
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