Study of Heat Transfer Performance of a Loop Thermosyphon Using an Environment-friendly Refrigerants as a Working Fluid
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Abstract
The objective of this study is to investigate the performance of a loop thermosyphon (LTS) by using environment-friendly refrigerants as the working fluids. An LTS is made of copper pipes with total height of 1,000 mm. The cross-sectional area ratio of the vapor pipe to liquid pipe is 4.46. The R134a, R32, R404a, R407C and R410A refrigerants are used as working fluids with the 20% volume-filling ratio. The experiment was conducted in a vertical orientation and the samples were heated by the electrical heater in the range of constant heat flux at 8.36–50.15 kW/m2. A condenser was cooled by the cold water with inlet temperature of 25°C and 6.67×10–3 kg/s of mass flow rate. The results showed that each type of refrigerant affected heat transfer performance of the LTS differently. Specifically the R32, R134a, R410A, R407C and R404A have minimum total thermal resistance at 0.1124, 0.1140, 0.1145, 0.1180 and 0.1199°C/W respectively. It also has been found that R32, R404A and R410A have the minimum total thermal resistance with the 30 kW/m2 heat flux while R134a and R407C has the minimum total thermal resistance when exposed to the heat flux of 40 kW/m2.
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