Journal
APPLIED THERMAL ENGINEERING
Volume 128, Issue -, Pages 1420-1429Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2017.09.131
Keywords
Defrosting; Compressor casing; Heat storage; Phase change material; Heat pump; Bypass cycle
Funding
- National Natural Science Foundation of China [51776006]
- Beijing Natural Science Foundation [3162008]
- Qinghai Province Scientific and Technological Application Research Project [2016-NN-142]
- Beijing Social Science Fund [S0011311201601]
- Beijing University of Technology [011000514117013]
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In this study, the defrosting system of an air source heat pump utilizing compressor casing heat storage combined with a hot gas bypass cycle (ASHP-CCHS-HGBC) was designed. The phase change material for defrosting was selected, the phase change heat storage exchanger was devised, and the ASHP-CCHS-HGBC test system was established. The power consumption, defrosting time, and the influence of the indoor exchanger outlet on the air temperature in the ASHP-CCHS-HGBC method were then compared with those of the reverse-cycle defrosting (RCD) and electric heating defrosting (EHD) methods. Experimental results reveal that the total defrosting time and consumption of the ASHP-CCHS-HGBC method was 100 s and 43.6 kJ, respectively. These values were lower by 10 s (9%) and 12.1 kJ (21.7%) relative to those of RCD. Moreover, the compressor suction temperature was increased by 10.1 degrees C during defrosting by ASHP-CCHS-HGBC. Under the normal heating operation for 2.5 h, 10 L hot water with a temperature of 30 degrees C was obtained, the compressor casing temperature was reduced by 4.6 degrees C. While defrosting, the air temperature of the indoor heat exchanger outlet declined to only 3.3 degrees C and exerted the least influence on the indoor temperature among those of the three defrosting methods. (C) 2017 Elsevier Ltd. All rights reserved.
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