Measured water heating performance of a vertical-bore water-to-water ground source heat pump (WW-GSHP) for domestic water heating over twelve months under simulated occupancy loads

Conference · Wed Jan 01 00:00:00 EST 2014

OSTI ID:1185428

Ally, Moonis Raza ^[1]; Munk, Jeffrey D ^[1]; Baxter, Van D ^[1]; Gehl, Anthony C ^[1]

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1. ORNL

This paper presents monthly performance metrics of a 5.275 kW (1.5 ton) WW-GSHP providing 227 L day-1 domestic hot water at 49 C. Daily water use is simulated as stipulated in the Building America Research Benchmark Definition capturing the living habits of the average U.S household. The 94.5m vertical-bore ground loop is shared with a separate GSHP for space conditioning the 251m2 residential home. Data on entering water temperatures, energy extracted from the ground, delivered energy, compressor electricity use, COP, WW-GSHP run times, and the impact of fan and pump energy consumption on efficiency are presented for each month. Factors influencing performance metrics are highlighted.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1185428
• Resource Relation: Conference: 11th IEA Heat Pump Conference, Montreal, Canada, 20140511, 20140516
• Country of Publication: United States
• Language: English

Related Subjects

ground source
heat pumps
water heating
renewable energy