http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최원재(W. J. Choi),김현우(H. W. Kim),백승문(S. M. Baek),강현준(H. J. Kang),이호생(H. S. Lee),정석권,윤정인(J. I,Yoon) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
Recently, technical trend for industrial machines is focused on enhancing of speed and accuracy. For high speed and high accuracy, a thermal deformation must minimize in industrial machines. To minimize the thermal influence, accuracy industrial machines need to be adopted a cooling system with high precision. In this study, we suggest a cooling system using PMV(Pulse Modulation Valve) control. In this system, we use a compressor which is able to be driven in condition of unloading. And a vapor refrigerant from the suction side of the compressor is injected back into the compressor suction side again using a PMV. The PMV control can be used by this method. Also, by comparing with the existing steady speed compressor method on identical operating conditions, we evaluated the efficiency and reliability of the new method. This method showed the efficiency and performance improved by lower compressor work using the vapor injection without compressor stop. And the COP of this system decreased when load capacity of compressor was decreasing. This result will be used for a basis data of comparative experiment with inverter control and manufacture of high accuracy water cooling system
이호생 (H. S. Lee ),오승택 (S. T. Oh ),김현우 (H. W. Kim ),최원재 (W. J. Choi ),윤정인 (J. I. Yoon ),이상규 (S. G. Lee ) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
In this study, modified cascade cycles which are two staged Intercooler and pre-expander types are simulated and designed, then compared performance with basic cascade process which is the base in liquefaction process. These are included methane, ethylene and propane cycles. The COP of two staged intercooler type and pre-expander type were showed about 12.6% and 23.6% higher than basic cascade process, and specific power was decreased about 28.0%.