Condensation of refrigerants in a multiport tube with rectangular minichannels |
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| Affiliation: | 1. Tokyo University of Marine Science and Technology, 2-1-6 Etchujima, Koto-ku 135-8533, Japan;2. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan;3. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan;1. Centro Universitario de la Defensa de San Javier (University Centre of Defence at the Spanish Air Force Academy), Ministry of Defense, Technical University of Cartagena, Santiago de la Ribera, Spain;2. Universidad Politécnica de Cartagena, Spain |
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| Abstract: | 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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