Dimensional analysis on the evaporation and condensation of refrigerant R-134a in minichannel plate heat exchangers
نویسندگان
چکیده
منابع مشابه
Experimental Study On R-134A Condensation Heat Transfer Characteristics In Plate And Shell Heat Exchangers
In this study, condensation heat transfer experiments were conducted with two types of plate and shell heat exchangers (P&SHE) using R-134A. An experimental refrigerant loop has been established to measure the condensation heat transfer coefficient of R-134A in a vertical P&SHE. Two vertical counter flow channels were formed in the P&SHE by stacking three plates of geometry with a corrugated tr...
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Evaporation of HFC134a inside smooth, horizontal tubes is studied. Te,;ts are made with pure refngerant and with oil-refrigerant mixtures. Heat flux has varied from 2 kW/n? to 10 kW/m . The inner diameter of the tubes are 12 mm. T1.1o evaporators are used, 4 and 10 m long. Oil content is varied from 0 to 2.5 mass percentage (synthetic oil, EXP-0275). Oil free HFC134a is found to have higher hea...
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Water vapor condensation and two-phase flow appear in plate heat exchangers being used as condensers. Analysis of water phase change and flow dynamics is an important but complicated task due to large change in water physical/transport properties across the water liquid-vapor interface boundary. In particular, a singular-link behaviour in Navier-Stokes (N-S) equations is present due to the larg...
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ژورنال
عنوان ژورنال: Applied Thermal Engineering
سال: 2006
ISSN: 1359-4311
DOI: 10.1016/j.applthermaleng.2006.03.015