http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
An Adiabatic Analysis of Stirling Refrigerator with Real Gas Properties of Helium
Jong-Hoon Baik,Ho-Myung Chang 대한설비공학회 1996 International Journal Of Air-Conditioning and Refr Vol.4 No.-
A Finkelstein adiabatic analysis for Stirling refrigerators is performed with real gas properties of helium. The mass balance and the energy balance equations are formulated into the form that is convenient for incorporating an available computer code to calculated the helium properties. An efficient computer program is developed to find the cyclic steady state for the given values of the input parameters, such as the displaced mass ratio, the dead volume ratio, the total mass of helium or the refrigeration temperature. The calculated coefficient of performance (COP) for the refrigeration and the pressure variation are compared with the results obtained when helium is assumed to be an ideal gas. The relative errors in COP are presented as functions of the refrigeration temperature and the maximum cycle pressure.
Thermal Loss due to Non - Ideal Gas Behavior of Helium in VM Heat Pump
Jong-Hoon Baik,Ho-Myung Chang 대한설비공학회 1997 International Journal of Air-Conditioning and Refr Vol.5 No.-
A cycle analysis is performed to investigate how the non-ideal gas behavior of helium reduces the heating capacity of VM heat pumps. Since the operating pressures of VM heat pumps are as high as 1 to 20 ㎫, the compressibility factor of helium becomes clearly greater than 1 and the non-ideal gas behavior always represents a thermal loss in heating. To calcutlate the amount of the losses, an adiabatic cycle analysis is performed with the real properties of helium and the net enthalpy flows through the two regerators are numerically obtained. It is shown that the non-ideal gas losses could be as much as 8% in the heating capacity when the operating pressures are greater than 10㎫. The effects of the operating temperatures and the dead volumes on the loss are presented.