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simplified Correlation Equations of Heat Transfer Coefficient during Phase Change for Flow inside Tubes

Journal of Energy and Power Engineering 2012年第10期6卷 1543-1552页

作者： Mahmoud A Hammad abed alrzaq s alshqirate Mechanical Engineering Department Faculty of Engineering and Technology University of Jordan Amman 11942 Jordan Department of Basic and Applied sciences Al-Shoubak University College AI-Balqa Applied University Al-Salt 19117 Jordan

In this work, the easy to use, simple and direct equations were formulated and tested. These equations can be used to calculate the mean values of the heat transfer coefficients of inside tube flow during phase change. Analytical and experimental methods were used to correlate these equations. Two different forms were used, one for evaporation case and the other for condensation case. Carbon dioxide, CO2, was used as case study. Correlated values of the mean heat transfer coefficients (hˉ corr) were compared with the experimental results (hˉ exp) and with other published result, a good agreement was noticed. The resulted correlations can be used to simplify the design and performance studies of both condensers and evaporators.

关键词：平均传热系数相关方程相变过程管内流动二氧化碳冷凝器方程组平均值

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Performance study of Refrigeration Units That Use the Refrigerant R-404A by Using Computer simulation

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Modern Mechanical Engineering 2016年第2期6卷 67-75页

作者： abed alrzaq sleman alshqirate Associate Professor of Mechanical Engineering Alshoubak University College Al-Balqa’ Applied University Al-Salt Jordan

The performance parameters of vapor compression refrigeration units that used the refrigerant R-404A were studied by developing a computer simulation algorithm. The various performance parameters investigated per one kilowatt of refrigeration capacity, such as the mass flow rate, the compressor power consumption, the condenser heat rejection rate, the compressor exit temperature and the coefficient of performance. Two refrigeration cycles were tested under various evaporating and condensing temperatures: the standard cycle and the ideal cycle with superheating and sub-cooling. The results of the present work reveal that the compressor power variation over the evaporating temperature range from –10℃ to 15℃at Tc = 40℃ is decreased by 38.8% for standard cycle and by 43.8% for ideal cycle. The compressor power variation over the condensing temperature range from 30℃ to 50℃ at Te = 10℃ is increased by 122% for standard cycle and by 54.5% for ideal cycle. On the other hand, the COP for the ideal cycle with 5℃ superheating and sub-cooling is approximately 25% higher than that of the standard cycle at Te = 10℃ and Tc = 40℃ for the refrigerant R-404A.

关键词： Refrigeration Units R-404A Computer simulation Refrigeration Performance Parameters

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