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이상재(S.J.Lee),김대훈(D.H.Kim),이민규(M.K.Lee),권영철(Y.C.Kweon),장근선(K.S.Chang),윤준원(J.W.Yun),정지환(J.H.Jeong) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The purpose of this study is to investigate me characteristics of the air-side heat transfer and pressure drop on the fin pattern of six types of φ 9.52 nun finned-tube heat exchangers. An air-enthalpy Calorimeter is used in this experiment. Experiments are carried out by changing velocity (from 0.7 m/s to 1.5 m/s). From results, we can see that the air-side heat transfer coefficients and the pressure drop depend upon the geometry of the heat exchanger. With increasing the inlet air velocity, the heat transfer and the pressure drop increase linearly and exponentially, respectively. At the same heat transfer area, the heat transfers in the low velocities are nearly the same and those in 1.5 m/s have the maximum 3% difference. The pressure drops have the different trend for the fin patterns.
PWM압축기를 이용한 시스템에어컨의 난방운전 시 압축기 토출온도 상관식
이상헌(S.H. Lee),권영철(Y.C. Kwon),장근선(K.S. Chang),허삼행(S.H. Heo),김대훈(D.H. Kim),윤백(B. Youn) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.6
An experimental study has been performed to investigate the correlation on compressor discharge temperature of system A/C in heating mode. Indoor and outdoor temperatures, the heating capacity, compressor discharge temperature and loading time are measured by the psychrometric calorimeter. The system is controlled by applying the scroll compressor, which is operated by PWM valve and loading duty. With increasing outdoor temperature, the heating capacity increases. With increasing indoor temperature, it decreases. Also, with increasing loading duty the heating capacity increases. According to the increase in outdoor temperature and loading duty, compressor discharge temperature increases. From these experimental data, the correlation on compressor discharge temperature is proposed. It is expressed as a function of indoor temperature, outdoor temperature, and loading duty. The correlation obtained from the present study is agreed with the experimental data within 2℃.
용량가변 시스템 에어컨의 냉방운전 시압축기 토출온도 상관식
이상헌(S.H. Lee),권영철(Y.C. Kwon),장근선(K.S. Chang),김대훈(D.H. Kim),허삼행(S.H. Heo),윤백(B. Youn) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
An experimental study has been performed to investigate the correlation on compressor discharge temperature of capacity modulated system A/C in cooling mode. Indoor and outdoor temperatures, the cooling capacity, compressor discharge temperature and loading time are measured by the psychrometric calorimeter. The system is controlled by applying the scroll compressor, which is operated by PWM valve and loading duty. With decreasing outdoor temperature, the cooling capacity increases. But, with decreasing indoor temperature, it decreases. Also, with increasing loading duty the cooling capacity increases. According to the increase in outdoor temperature and loading duty, compressor discharge temperature increases. From these experimental data, the correlation on compressor discharge temperature is proposed. It is expressed as a function of indoor temperature, outdoor temperature, and loading duty. The correlation obtained from the present study is agreed with the experimental data within 3℃.