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Thermal performance of ice-making machine with a multi-channel evaporator

机译：带有多通道蒸发器的制冰机的热性能

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摘要

An experimental investigation is presented in this paper on the vapor compression refrigeration cycle used in an ice-making machine with a multi-channel evaporator. To study the operation performance of the refrigeration system in the ice-making machine, the fluid temperature distribution in multi-channel evaporating coils are tested and the dynamic variations in each cooling loop are investigated during the ice-generating phase. The results show that the external cooling loops have the largest temperature fluctuations caused by the large initial refrigerant injecting mass flow and the external environmental disturbances. For the inner cooling loops, the related temperature profiles of different test points have relative stable variations. To reduce the temperature fluctuations of the outside loops, it is suggested to reduce the initial refrigerant mass flow and adjust the initial opening of the thermal expansion valve. Moreover, it is the normal phenomenon for the slight temperature variations for the temperature curves of different test points, caused by the adjustment of thermal expansion valve. During the ice-making process, both the sensible heat removal phase and latent heat removal phase are experienced successively. To remove the sensible heat of water, the refrigerant system is operating in high efficiency with test points having a rapid linear temperature reduction. While for eliminating the latent heat of ice, it requires much more power supply, the relating test points have a temperature decrease with fluctuations. To improve the operation performance of ice machine, some suggestions and improvements are proposed.
机译：本文针对具有多通道蒸发器的制冰机中使用的蒸汽压缩制冷循环进行了实验研究。为了研究制冰机中制冷系统的运行性能，测试了多通道蒸发盘管中的流体温度分布，并研究了在制冰阶段各个冷却回路的动态变化。结果表明，外部冷却回路具有较大的温度波动，这是由较大的初始制冷剂注入质量流量和外部环境干扰引起的。对于内部冷却回路，不同测试点的相关温度曲线具有相对稳定的变化。为了减少外部回路的温度波动，建议减少初始制冷剂质量流量并调整热力膨胀阀的初始开度。此外，由于热力膨胀阀的调整，导致不同测试点温度曲线的温度略有变化是正常现象。在制冰过程中，先后经历显热除热阶段和潜热除尘阶段。为了去除水的显热，制冷剂系统以高效率运行，并且测试点的线性温度迅速降低。为了消除冰的潜热，它需要更多的电源，而相关的测试点却随着温度的降低而波动。为了提高制冰机的运行性能，提出了一些建议和改进。

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