Performance Evaluation of Compact Heat Exchanger

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  • コンパクト熱交換器に関する性能評価
  • コンパクト熱交換器に関する性能評価(第1報)流動性能と凝縮性能
  • コンパクト ネツコウカンキ ニ カンスル セイノウ ヒョウカ(ダイ1ポウ)リュウドウ セイノウ ト ギョウシュク セイノウ
  • ―第１報：流動性能と凝縮性能―
  • -1st Report: Flow Performance and Condensing Performance-

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Abstract

<p>The flow performance and condensation performance of the heat exchanger (ISC_HEX) which is extremely compact are experimentally investigated and analyzed to understand its characteristics in this study firstly. And then, the water to refrigerant ISC_HEX for practical use of Air To Water Heat Pump(ATW)is developed. The ratio occupied by the shape loss estimated from the measurement result of the pressure drop between the heat exchanger inlet and outlet is dominant. The pressure drop between the inlet and outlet of the heat exchanger at the 0.65 m/s velocity condition can be greatly reduced as compared with a conventional heat exchanger. The maximum hot water temperature 75°C was obtained under the control condition of a heat exchange capacity of 3.5 kW, using the refrigerant R410A. In this case, value of a heat exchange capacity for unit volume is 69.4 W/cm3 against to brazing plate heat exchanger is 3.3 W/cm3. The maximum heat exchange capacity of 5.8 kW is realized and the maximum outlet hot water temperature reached 58°C with the ISC_HEX, under exprimental conditions that change the heat exchange capacity, using the refrigerant R410A. Also, that the overall heat transfer coefficient reached 5500 to 8500 W/m2· K in our experiment using the ISC_HEX is clarified.</p>

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