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http://dx.doi.org/10.5916/jkosme.2014.38.9.1027

A study on design for free cooling system using dry cooler  

Yoon, Jung-In (Department of Refrigeration and air-conditioning Engineering, Pukyong University)
Baek, Seung-Moon (Department of Refrigeration and air-conditioning Engineering, Pukyong University)
Heo, Jeong-Ho (Graduate School of Department of Refrigeration and air-conditioning Engineering, Pukyong University)
Kim, Young-Min (Jung-In Hitech LTD.)
Son, Chang-Hyo (Department of Refrigeration and air-conditioning Engineering, Pukyong University)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.38, no.9, 2014 , pp. 1027-1031 More about this Journal
Abstract
Free cooling system is used to reduce energy consumption of cooling system. Free cooling system is consisted of cooling group and dry-cooler in which heat exchange of chilled water and out air is conducted. Although this system has an excellent energy saving effect in place having cooling load regularly, data or material of design for free cooling system is lacked. In this study, characteristics analysis of free cooling system is conducted through software HYSYS with changing some facts. The main result is following as : Dry-cooler capacity is influenced by out air temperature, required chilled water temperature and LMTD(Logarithmic Mean Temperature Difference) of heat exchanger. As out air temperature is more low, dry-cooler capacity become increased. in addition, as required chilled water temperature is more high and LMTD is more low, the out air temperature range is widened for using dry-cooler. If out air temperature is below $0^{\circ}C$, antifreeze need to be used because freeze and burst can be occurred. In case of South Korea, antifreeze of 34% of ethylene glycol concentration is proper. When compressor load of R22, R134a and R407C is compared, considering environmental regulation and energy consumption, R134a is best working fluid.
Keywords
Free cooling system; Dry-cooler; Compressor load; Antifreeze; Refrigeration ability; HYSYS;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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5 Aspentech Software HYSYS v8.4.
6 J. I. Yoon, C. H. Son, J. H. Heo, and Y. M. Kim, "Analysis of energy reduction of free cooling system using dry cooler with regions," Proceedings of the 38th KOSME Spring Conference, pp. 173-174, 2014 (in Korean).