This paper presents recent measurements of heat transfer coefficients obtained during condensation of refrigerants R410A and R32 inside a commercial brazed plate heat exchanger cooled by water. The experimental data show the effect of refrigerant mass velocity, vapor quality, temperature difference (saturation to wall) and inlet vapor superheating. In particular the specific mass velocity is varied between 15 and 40 kg m-2 s-1 and the outlet vapor quality between 0.0 and 0.65. Inlet vapor superheating is varied between 5 and 25 K. The experimental data are collected for both fluids at around 36.5°C saturation temperature, which can be considered a usual temperature level for water cooled heat pump applications. The condensation heat transfer coefficient increases with mass velocity and mean vapor quality. It also increases with inlet superheating, particularly at low saturation to wall mean temperature difference. Finally the experimental measurements have also been compared with the calculated values from a model developed by present authors. The condensation heat transfer performances of the two high pressure refrigerants, R32 and R410A, are also compared.
Condensation of R32 and R410 inside a brazed plate heat exchanger
MANCIN, SIMONE;DEL COL, DAVIDE;ROSSETTO, LUISA
2012
Abstract
This paper presents recent measurements of heat transfer coefficients obtained during condensation of refrigerants R410A and R32 inside a commercial brazed plate heat exchanger cooled by water. The experimental data show the effect of refrigerant mass velocity, vapor quality, temperature difference (saturation to wall) and inlet vapor superheating. In particular the specific mass velocity is varied between 15 and 40 kg m-2 s-1 and the outlet vapor quality between 0.0 and 0.65. Inlet vapor superheating is varied between 5 and 25 K. The experimental data are collected for both fluids at around 36.5°C saturation temperature, which can be considered a usual temperature level for water cooled heat pump applications. The condensation heat transfer coefficient increases with mass velocity and mean vapor quality. It also increases with inlet superheating, particularly at low saturation to wall mean temperature difference. Finally the experimental measurements have also been compared with the calculated values from a model developed by present authors. The condensation heat transfer performances of the two high pressure refrigerants, R32 and R410A, are also compared.Pubblicazioni consigliate
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