Flashing flow mechanisms of HFC-134A and HFC-410A through short-tube orifices
Conference proceedings article
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Author list: Nilpueng K., Wongwises S.
Publisher: Hindawi
Publication year: 2011
ISBN: 9780791838921
eISSN: 1745-4557
Languages: English-Great Britain (EN-GB)
Abstract
In this study, the flow mechanisms of HFC-134a and HFC-410A, including flow pattern, pressure distribution, temperature distribution, and mass flow rate inside short-tube orifice are presented and compared under the same working temperature. The test runs are performed at condenser temperature ranging between 35 and 45ฐC, evaporator temperature ranging between 2 and 12ฐC, and degree of subcooling ranging between 1 and 12 ฐC. The results show that the temperature distribution along the short-tube orifice obtained from HFC-410A is slightly higher than that obtained from HFC-134a. On the other hand, the pressure distribution between both refrigerants shows the large difference. It is also found that the tendency of mass flow rate obtained from HFC-134a almost coincides with those obtained HFC-410A as the operating conditions and short-tube orifice size are varied. However, the average mass flow rate of HFC-134a is slightly lower than that of HFC-410A. Copyright ฉ 2011 by ASME.
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