EXPERIMENTAL STUDY ON A TWO-STAGE COMPRESSION AIR-SOURCE HEAT PUMP WATER HEATER SYSTEM
Air-source heat pump (ASHP) water heater is a device for hot water in which heat is absorbed from air by heat pump through consuming a little electricity. While there are some disadvantages of ordinary single-stage heat pump in low-temperature environment, such as high compression ratio, scarce heating ability and low efficiency. Two-stage compression refrigeration cycle was put forward to be used in the air-source heat pump to solve the low temperature adaptability of ASHP in this paper. Combining the single-stage heat pump, a two-stage compression air-source heat pump water heater was designed, and the experimental instrument of prototype has been built up for experimental study. Some conclusions are obtained through actual tests. Compared with single-stage compression cycle, the two-stage cycle’s compression ratio is much less, and the heating ability is generally higher. The COP of the two-stage system surpasses the single-stage cycle when the ambient temperature falls to 5℃, and it could keep to about 1.5?? when the ambient temperature is -20℃.
Air-source heat pump Two-stage compression Water heater
W.B.Wu S.M.JIN
Institute of Air-Conditioning and Refrigeration, Nanjing University of Technology Nanjing, 210009￡?China
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）