發(fā)布時間：2019-06-22 16:58

【摘要】：提出R404A直接接觸凝結(jié)換熱的制冷循環(huán),分析R404A直接接觸凝結(jié)制冷循環(huán)的熱力性能,并與常規(guī)雙級壓縮制冷循環(huán)的性能進(jìn)行對比。得出結(jié)論:在一定的冷凝溫度、蒸發(fā)溫度和過冷液體的過冷度下,直接接觸凝結(jié)制冷循環(huán)存在最佳的飽和液體溫度,并在此最佳的飽和液體溫度下,獲得最優(yōu)的性能和最小的冷凝熱負(fù)荷,隨著過冷液體的過冷度增大和蒸發(fā)溫度升高,直接接觸凝結(jié)制冷循環(huán)的性能系數(shù)增加、冷凝熱負(fù)荷減少,獲得最優(yōu)性能的最佳飽和液體溫度值提高。過冷液體的過冷度為25℃時,直接接觸凝結(jié)制冷循環(huán)的最佳性能系數(shù)較雙級壓縮制冷循環(huán)的最佳性能系數(shù)提高6.2%。直接接觸凝結(jié)制冷循環(huán)的最小冷凝熱負(fù)荷較雙級壓縮制冷循環(huán)的最小冷凝熱負(fù)荷減小1.8%。
[Abstract]:The refrigeration cycle of R404A direct contact condensation heat transfer is proposed. The thermodynamic performance of R404A direct contact condensation refrigeration cycle is analyzed and compared with that of conventional two-stage compression refrigeration cycle. It is concluded that there is the best saturated liquid temperature in the direct contact condensation refrigeration cycle under certain condensation temperature, evaporation temperature and undercooling degree of subcooled liquid, and at this optimal saturated liquid temperature, the optimal performance and minimum condensation heat load are obtained. with the increase of supercooling degree and evaporation temperature of supercooled liquid, the performance coefficient of direct contact condensation refrigeration cycle increases and the condensation heat load decreases. The optimum temperature value of saturated liquid with the optimal performance is improved. When the undercooling degree of supercooled liquid is 25 鈩，

本文編號：2504789