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为了提高制冷循环的性能,我们提出了一个方法:采用喷射器使冷媒蒸气再循环。这种方法通过增加蒸发器入口处冷媒的干度(x)和质量流量来增加沸腾传热系数(a)。在本文中,我们用实验的方法研究了平板式蒸发器中a与x的关系,这种关系能够正常用于实际的盐水制冷装置。另外,我们研究了压降和x及质量流量△Pevp和a的比例关系。结果,得到了a和以及x的实验式。此外,通过这些实验式,我们计算出提高实际盐水制冷装置性能的再循环流量。因此,我们发现当再循环流量与制冷循环流量的比值在0.6-0.7时,与传统循环相比,盐水制冷装置的COP值可以提高5.2-7.2%。
In order to improve the performance of the refrigeration cycle, we propose a method: the ejector is used to recycle the refrigerant vapor. This method increases the boiling heat transfer coefficient (a) by increasing the refrigerant dryness (x) and mass flow at the evaporator inlet. In this paper, we experimentally study the relationship between a and x in a plate evaporator, which relationship can be used normally in an actual brine water cooling plant. In addition, we study the pressure drop and x and mass flow rate △ Pevp and a proportional relationship. As a result, the experimental formulas of a and x are obtained. In addition, through these experimental equations, we calculate the recirculation flow that increases the performance of an actual brine chiller plant. As a result, we found that when the ratio of recirculation flow to refrigeration cycle flow is between 0.6 and 0.7, the COP value of the brine chiller can be increased by 5.2-7.2% compared to the conventional cycle.