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Omar Abdelaziz, Ph.D., Oak Ridge National Laboratory
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Rice Keith, Ph.D., Oak Ridge National Laboratory
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Van D. Baxter, P.E., Oak Ridge National Laboratory
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In the U.S., there are 14.4 M electric-heated dwellings using 0.16 quad/year for heating in cold regions, e.g. ASHRAE climate regions IV and V. Conventional air-source heat pumps (ASHP) do not work well in such cold zones, due to high compressor discharge temperatures, large pressure ratios and inadequate heating capacities at low ambient temperatures. Consequently, noticeable portion of auxiliary strip heating has to be used to meet the building heating load. Two options of tandem compressors were studied, with one using two identical, single-speed compressors, and the other using two identical, vapor-injection compressors. The system modeling and laboratory testing results will be presented in the paper.
