Experimental study on the control characteristics of each channel in a semiconductor chiller

Abstract

The characteristics of a semiconductor chiller system with EEV have been experimentally studied Three experiments on temperature changes (increase and decrease), load variation, and control precision were conducted to investigate the operating characteristics of the semiconductor chiller. The power consumption was 8.9 kW during increase in temperature. The required time was 37.5 min for CHI and 39.5 min for CH2. Moreover, the time required for falling temperature was 26.5 min The control precision for partial load operation was relatively low compared to that of a full load operation. In addition, the CH2 equipped with a step motor showed better control precision The power consumed by the chiller for process cooling water was 1.8 kW, which was one-half of that consumed during the refrigeration cycle. The objective of this study is to provide an optimal control guideline for the semiconductor chiller design. © 2011 The Korean Society of Mechanical Engineers.