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  • the effect of vapour super-heating on hydrocarbon refrigerant condensation inside a brazed plate heat exchanger

    نویسندگان :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 990
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
      this paper investigates the effect of vapour super-heating on hydrocarbon refrigerant 600a (isobutane), 290 (propane) and 1270 (propylene) condensation inside a brazed plate heat exchanger. vapour super-heating increases heat transfer coefficient with respect to saturated vapour, whereas no effect was observed on pressure drop. the super-heated vapour condensation data shows the same trend vs. refrigerant mass flux as the saturated vapour condensation data, but with higher absolute values. a transition point between gravity controlled and forced convection condensation has been found for a refrigerant mass flux around 15– 18 kg m2 s1 depending on refrigerant type. the super-heated vapour heat transfer coefficients are from 5% to 10% higher than those of saturated vapour under the same refrigerant mass flux. the experimental heat transfer coefficients have been compared against webb (1998) model for forced convection condensation of super-heated vapour: the mean absolute percentage deviation between the experimental and calculated data is ±18.3%. hc-1270 shows super-heated vapour heat transfer coefficient 5% higher than hc-600a and 10–15% higher than hc-290 together with total pressure drops 20–25% lower than hc-290 and 50–66% lower than hc-600a under the same mass flux.

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