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PERFORMANCE CHARACTERISTICS OF COOLER CONTROLED CAPACITY USING HOT-GAS BYPASS

DOI: 10.1615/ICHMT.2009.CONV.1320
page 9

Jun-Hyuk Choi
Department of Refrigeration and Air-Conditioning Engineering, Graduate School, Pukyong National University, #100, Yongdang, Namgu, Busan, 608-739, Korea

Seung-Moon Baek
Department of Refrigeration and Air-Conditioning Engineering, Graduate School, Pukyong National University, #100, Yongdang, Namgu, Busan, 608-739, Korea

Byoung-Ju Jin
Department of Refrigeration and Air-Conditioning Engineering, Graduate School, Pukyong National University, #100, Yongdang, Namgu, Busan, 608-739, Korea

Won-Jae Choi
Department of Refrigeration and Air-Conditioning Engineering, Graduate School, Pukyong National University, #100, Yongdang, Namgu, Busan, 608-739, Korea

Choon-Geun Moon
Daeil Co. Ltd., 1069-5 Dalsanri Gijang-gun Busan, Korea

Ho-Saeng Lee
School of Mechanical Engineering, College of Engineering, Pukyong National University, #100, Yongdang, Namgu, Busan, 608-739, Korea

Jung-In Yoon
School of Mechanical Engineering, College of Engineering, Pukyong National University, #100, Yongdang, Namgu, Busan, 608-739, Korea

Abstract

This paper presents the performance characteristics of hot-gas bypass capacity system for water cooler of machine tool. The system was designed for hot-gas bypass from outlet of compressor to the inlet of evaporator. The water cooler was used to reduce thermal deformation and contraction due to high speed of machine tools. The results show that maximum refrigeration capacity of 4.3 kW was obtained from 0 step of electronic expansion valve (EEV) in the chilled water outlet temperature of 25°C and the chamber temperature of 25°C and minimum refrigeration capacity of 0.41 kW was obtained from 375 steps of EEV at the chilled water outlet temperature of 16°C. Chilled water outlet temperature of 19°C and 16°C were not obtained from over 375 steps of EEV in the chamber temperature of 25°C. In this study, an EEV was used to control capacity for water cooler. The ranges of capacity control were from 100 to 10% to set the chilled water temperature of 25°C at the outdoor temperature of 35°C of general machine tools in Korea. It was found that there is the possibility of capacity control with hot-gas bypass system.

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