| Title |
Comparison of System Performances of Hot-gas Bypass and Compressor Variable Speed Control of Water Coolers for Machine Tools |
| Authors |
정석권(Seok-Kwon Jeong) ; 이단비(Dan-Bi Lee) ; 윤정인(Jung-In Yoon) |
| DOI |
http://dx.doi.org/10.6110 /KJACR.2012.24.1.001 |
| Keywords |
공작기계 ; 수냉각기 ; 핫가스 바이패스 ; 압축기 가변속 제어 ; PI 제어 로직 Machine tool ; Water cooler ; Hot-gas bypass ; Compressor variable speed control ; PI control logic |
| Abstract |
Recently, the needs of system performances such as working speed and processing accuracy in machine tools have been increased. Especially, the speed increment generates harmful heat at both moving part of the machine tools and handicrafts. The heat is a main drawback to progress accuracy of the processing. Hence, a cooler system to control temperature is inevitable for the machine tools. In general, two representative control schemes, hot-gas bypass and variable speed control of a compressor, have been adopted in the water cooler system. In this paper, comparisons of system performances according to the control schemes in a cooler for machine tools were conducted in detail. Each proportional-integral feedback controller for the two different control systems is designed. The system performances, especially the temperature control accuracy and coefficient of performance which is a criterion of energy saving, were mainly analyzed through various experiments using 1RT water cooler system with different two types of control scheme. These evaluations will provide useful information to choose suitable water cooler system for the engineers who design controllers of the cooler system for machine tools. |