Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Drying and Low Temperature Storage System of Agricultural Products using the Air to Air Heat Pump (II) - Performance of Low Temperature Storage for Apples -

히트펌프를 이용한 농산물 건조 및 저온저장 시스템 (II) - 사과의 저온저장 성능 -

  • Kang, Y.K. (National Institute of Agricultural Engineering (NIAE)) ;
  • Han, C.S. (Dept. of Bio System Engineering, Chungbuk National University) ;
  • Keum, D.H. (Dept. of Bio-Mechatronic Engineering, SungKyunKwan University)
  • Published : 2007.04.25
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Abstract

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 $-13^{\circ}C$ to $29.6^{\circ}C$ during low temperature storage period from January to June, the average temperature of low temperature storage chamber was $1.1^{\circ}C$ at setting temperature of $1.5^{\circ}C$. 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.

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References

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