A 3-ton earth-coupled heat pump system designed specifically for easy installation in modular classrooms, mobile office buildings, and mobile homes is being tested in a modular classroom in Johnston County, North Carolina. Approximately 2,000 gallons of saltwater is stored in plastic bladders underneath the building. The saltwater is circulated through the heat pump at a temperature that is conducive to efficient operation in both cooling and heating modes. The earth underneath the bladders exchanges heat with the water and provides long-term thermal storage. Heat is also exchanged between the storage water and the ambient air. A computer model predicted annual energy usage of approximately one-half that of a traditional air-source heat pump for a typical meteorological year. Data collected during the past year show that this prediction is being met for the heating mode. In the cooling mode, the earth-coupled heat pump used about 80% as much electricity as the air-source heat pump. However, the earth-coupled heat pump maintained the classroom at a lower temperature during the summer and was more heavily loaded. When differences in the building loads are taken into account, the measured performance is close to the model prediction.
Test of an earth-coupled heat pump with aboveground water storage
2001
8 Seiten, 8 Quellen
Aufsatz (Konferenz)
Englisch
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