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This study investigated the condensation heat transfer and pressure drop characteristics of refrigerants R134a, R32, R1234ze(E), and R410A in a horizontal multiport tube with rectangular minichannels, in the mass velocity range of 100–400?kg?m-2?s-1 and saturation temperature set at 40 and 60 °C. The effect of mass velocity, vapor quality, saturation temperature, refrigerant properties, and hydraulic diameter of rectangular channels on condensation characteristics is clarified. A new correlation is proposed for predicting the frictional pressure drop for condensation flow in minichannels. A heat transfer model for condensation heat transfer in rectangular minichannels is developed considering the flow patterns and effects of vapor shear stress and surface tension. Then, based on this model, a new heat transfer correlation is proposed. The proposed correlations successfully predict the experimental frictional pressure drop and heat transfer coefficients of the test refrigerants in horizontal rectangular minichannels.
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Details
- Original title: Condensation of refrigerants in a multiport tube with rectangular minichannels.
- Record ID : 30017771
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 67
- Publication date: 2016/07
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Indexing
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Themes:
Evaporators, condensers and other heat exchangers;
HFCs;
Heat transfer - Keywords: R410A; R134a; Geometry; Tube; Heat transfer; R32; R1234ze; Refrigerant; Condensation; Pressure drop
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- Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
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- Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
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