Proceedings of the SAREK Conference (대한설비공학회:학술대회논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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An Experimental Study on Evaporation/Condensation Heat Transfer with Flow Direction in Brazed Plate Heat Exchanger using Refrigerant 410A

R410A를 이용한 브레이징 타입 판형열교환기에서 물 측 유동방향에 따른 응축/증발 성능 평가

  • Lee, Sung-Woo (School of Mechanical Engineering, Pusan National University) ;
  • Jeong, Young-Man (School of Mechanical Engineering, Pusan National University) ;
  • Lee, Jae-Keun (School of Mechanical Engineering, Pusan National University) ;
  • Lee, Dong-Hyuk (Digital Appliance Laboratory, LG Electronics)
  • Published : 2009.06.25
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Abstract

The plate heat exchanger(PHE) in heat pump has two flow streams of the refrigerant and water. The flow direction of the refrigerant, unlike that of water, can be changed by a 4-way valve depending on operating condition. Therefore the flow arrangement is a parallel flow for heating and a counter flow for cooling, respectively. In this study, the effects of the flow direction of the water on the heat transfer rate are investigated experimentally. The experiments are carried out for brazed plate heat exchangers under a parallel and counter flow conditions in evaporation and condensation. The experimental parameters in this study include the mass flux of the refrigerant 410A from 3 to $14\;kg/m^2s$ and the flow patterns for the pressure of PHE fixed at 0.97 and 2.46 MPa. The results show that both the heat transfer rate and frictional pressure drop across the PHE increase with the mass flux. The heat transfer rate of the refrigerant 410A for evaporation show great sensitivity to flow direction of the water. The heat transfer rate for evaporation with a counter flow are 5-30% higher than that with a parallel flow.

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