G103 PERFORMANCE EVALUATION OF OSCILLATING HEAT PIPE HEAT EXCHANGER FOR LOW TEMPERATURE WASTE HEAT RECOVERY(Heat pipe fundamental and application)

概要

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The performance of heat exchanger was evaluated to heat exchanger using oscillating heat pipe for waste heat recovery of low temperature. Oscillating heat pipe used in this heat exchanger was formed to the closed loop of the serpentine shape using copper tubes. Heat exchanger was formed to shell and tube type and composed of low-finned tube. R-22 and R-141b were used as the working fluids of tube side and their charging ratio was 40%. And, water was used as the working fluid of shell side. As the experimental parameters, the inlet temperature difference between heating and cooling part of secondary fluid and the mass velocity of secondary fluid were used. The mass velocity of secondary fluid was changed from 90kg/m^2s to from 190kg/m^2s. According to the test conditions, the performance tests were conducted to evaluate the waste heat recovery for low temperature. From the experiments, heat recovery rate was linearly increased to the increment of the mass velocity of secondary fluid and the inlet temperature difference of secondary fluid. Finally, the performance of heat exchanger was evaluated by using effectiveness-NTU method and it was found that waste heat recovery's economic value would be considered when NTU of it was became more than 1.5.
社団法人日本機械学会の論文
2000-10-01