용량가변형 압축기를 이용한 수냉각기의 정밀온도제어 특성

Abstract

This paper presents the characteristics of temperature control on PWM(Pulse Width Modulation) valve period variation in water cooler. The water cooler was used to reduce thermal deformation and contraction due to high speed of machine tools. In this study, we suggest a high accuracy water cooling system using PWM valve control. In this system, we use a compressor which is able to be driven in condition of unloading to improve the efficiency of PWM valve control. By varying PWM valve period on identical operating conditions, we evaluated the efficiency and reliability of the new method. This study shows that the COP of this system decreased when load capacity of compressor was decreasing. And precision of this system using PWM valve was higher than ON/OFF type. This result will be used for a basis data of comparative experiment with inverter control and manufacture of high accuracy water cooling system.