Condensation Heat Transfer Characteristics of R22, R134a, R410A and R407C on Single Horizontal Plain and Finned Tubes
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This paper presents experimental results of the condensation heat transfer characteristics for pure refrigerants R22 and R134a, binary refrigerant R410A and non-azeotropic mixture R407C on single horizontal smooth and finned tubes. The experiments were conducted at saturated temperature (35 oC and 40 oC), inlet coolant temperature (25 oC and 30 oC) and coolant mass flow rate (100 - 800 kg/h) resulting refrigerant mass flux of 20 – 400 kg/m2s for smooth and finned tubes. For finned tubes, the pitch to height ratio varies from 0.5 to 3.08. Experimental results confirmed that the heat flux and the overall heat transfer coefficient for R22, R134a, R410A and R407C increase when coolant mass flow rate, saturation temperature and fin height increase or as both coolant inlet temperature and fin pitch decrease. The heat flux and the overall heat transfer coefficient for R410A were correlated with the investigated parameters. Comparison among four refrigerants; R410A provides better condensation heat transfer characteristics and it yields higher condensation heat transfer coefficients than those of other refrigerants by 8 to 27%. However, the condensation heat transfer coefficients of R407C are much lower than those of other refrigerants for all investigated parameters. As a replacement of R22, R410A has more advantages than R407C in view of condensation heat transfer characteristics
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