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攀This study was conducted by the research fund supported by Ministry of agriculture and forest. The article was submitted for publication in January 2007, reviewed in February 2007, and approved for publication by the editorial board of KSAM in April 2007. The authors are Youn Ku Kang, KSAM member, Post-Doctoral Researcher, National Institute of Agricultural Engineering(NIAE), Chung Su Han, KSAM member, Professor, Dept of Bio System Engineering, Chungbuk National University, Cheoungju, Korea, and Dong. Hyuk. Keum, Professor, Dept of Bio-Mechatronic Engineering, SungKyunKwan University, Suwon, Korea.Corresponding author; Y. K. Kang, Energy and Resources Engineering Laboratory, NIAE, Suwon, 441-100, Korea; Tel : +82-31-290-1902; Fax : +82-31-290-1945; E-mail: <ykk0977@rda.go.kr>.攀攀Heat pump systems are recognized to be heating and cooing systems. In this study, to check the practical application possibility of heat pump systems as low temperature storage systems and get basic data, apples of a long term storage items were stored and performance of low temperature storage and quality changes of apples were evaluated.Cooling coefficient of performance of the system was from 1.1 to 1.3. Although ambient air temperature varied widely from -13℃ to 29.6℃ during low temperature storage period from January to June, the average temperature of low temperature storage chamber was 1.1℃ at setting temperature of 1.5℃.Sucrose of apples stored by the heat pump decreased from initial sucrose of 15.4%(Brix number) to final sucrose of 14.3%. Weight loss ratio of apples was 9.7% and internal and external view of apples after low temperature storage were very satisfactory with the naked eye.