핫가스 바이패스를 이용한 워터쿨러의 정밀온도제어

Abstract

Recently, technical trend in machine tools is focused on enhancing of speed and accuracy. The water cooler was used to reduce thermal deformation and contraction due to high speed of machine tools. The apparatus was designed for hot-gas bypass system which a hot-gas can flows from outlet of compressor to the inlet of evaporator. This experiment is the intermediary study for precise temperature control through PID control. The results show that the evaporator pressure increased and refrigeration capacity decreased as the EEV opening step of hot-gas bypass increased. These results can be used as basic data for the design of effective water cooler. In addition, control period of an electronic expansion valve were considered to increment of lifetime of the machine tools and quality of product with a water cooler.