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논문 기본 정보

저자정보
(성균관대학교)
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2008년도 열공학부문/유체공학부문 춘계학술대회 논문집
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    초록·키워드

    The present study investigated the performance evaluation of heat exchangers for heat pump evaporators under frosting conditions. The plate and slit fin-and-tube heat exchangers with a tube diameter of 7㎜ were used. The evaporator which was 400×252×12.7 ㎜ (H×W×D) was tested for two different types of plate fins and slit fins with the pitch of 1.5㎜. The experimental parameters were face velocity and number of rows. The pressure drop of the slit fin-and-tube heat exchanger was increased while the heat transfer rate was decreased as the frost increased. This is because as the frost clings to the slits, the enhancement of heat transfer of the slit fin-and-tube heat exchanger decreased due to the decrease of the leading edge effect and the mixing effect of air. From the flow and heat transfer characteristics, the HGR was considered as an index to evaluate the performance of the heat exchanger. The HGR was over 1 under frosting conditions and it was concluded that it was a proper index for the capacity of the heat exchanger.

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      UCI(KEPA) : I410-ECN-0101-2009-550-018670497