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자료유형
학술저널
저자정보
저널정보
대한설비공학회 설비공학논문집 空氣調和·冷凍工學 論文集 제11권 제4호
발행연도
1999.7
수록면
472 - 483 (12page)

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The evaporation heat transfer and pressure drop characteristics for HFC-134a in flat plate type heat exchangers with enhanced beads were experimentally investigated. Three plate type evaporators with different geometric condition of U-turn area were tested. Mass fluxes were tested over the range of 83 ㎏/㎡s to 166 ㎏/㎡s, and heat fluxes were varied from 4 ㎾/㎡ to 12 ㎾/㎡. Evaporation temperature was 5℃ with inlet qualities of 0.1 to 1.0.
There was no notable difference in the heat transfer coefficient by geometric variation of U-turn area, but the third plate with cross-ribbed channel at U-turn area was better than others in the evaluation using volume goodness factor comparison. Also, the mixtures of HFC-134a and PAG oil was tested to determine oil effects on heat transfer and pressure drop. As oil concentration was increased, heat transfer coefficient was increased by 22-48% up to the 3 wt.%, but decreased by 14-22% at the 4 wt.%. The pressure drop was increased by the maximum of 100% as oil concentration was increased.

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