Ground & Water Source Heat Pumps
Topic: Performance parameters of ground and water source heat pumps (@ about 1400 CFM & 8 GPM)
The table below is useful for evaluating the lifecycle costs of ground and water source heat pumps with relative efficiency ratings of "standard", "high" and "ultrahigh":
| Reference | Standard | High | Ultrahigh | |
|---|---|---|---|---|
| WSHP | ARI EER[EIR] (85°F, cooling) | 12.2[0.280] | 14.0[0.244] | 14.3[0.239] |
| WSHP | ARI COP[EIR] (70°F, heating) | 4.14[0.242] | 4.57[0.219] | 4.70[0.213] |
| GSHP | NW EER[EIR] (56°F, cooling) | 15.5 [0.220] | 20.2[0.169] | 23.4[0.146] |
| GSHP | NW COP[EIR] (50°F, heating) | 3.76[0.266] | 4.15[0.241] | 4.30[0.233] |
For water source heat pumps utilizing a fluid cooler in the maritime Pacific Northwest, Standard ARI Conditions are recommended with condenser water available at 85°F in the summertime for cooling, and 70°F in the wintertime for heating.
For groundsource heat pumps in the maritime Pacific Northwest, design conditions were estimated to provide 56°F condenser supply water temperature in the summertime for cooling, and 50°F in the wintertime for heating.
Equipment efficiencies are defined for eQuest in terms of the Electric Input Ratio (EIR), which is simply the inverse of the COP. Divide EER by 3.412 to obtain COP.
Compare the above performance numbers with those of the WSEC 2006 and ASHRAE 90.1 Appendix G, ... [TBD]
The following manufacturer and equipment model published data was used to compile the above table (note the relative subjectivity of the terms 'standard', 'high' and 'ultrahigh'):
Standard & High-Efficiency: ClimateMaster, Genesis Series, High and UltraHigh Efficiency
Ultrahigh Efficiency: Florida Heat Pump, ES Series, Two Stage R-410A
