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首页> 外文期刊>International Journal of Refrigeration >Effect of sudden changes in evaporator external parameters on a refrigeration system with an evaporator controlled by a thermostatic expansion valve
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Effect of sudden changes in evaporator external parameters on a refrigeration system with an evaporator controlled by a thermostatic expansion valve

机译：蒸发器外部参数的突然变化对带有由恒温膨胀阀控制的蒸发器的制冷系统的影响

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摘要

A theoretical model is used to investigate the effect of sudden changes in the evaporator external parameters on the behaviour of a refrigeration system with a dry-expansion evaporator controlled by a thermostatic expansion valve. The analysis showed that even under stable operation, sudden changes in chilled water inlet conditions may result in unstable system for a certain period of time. Results were obtained for the 50 and 25% partial loads. The inlet chilled water temperature and mass flow rate were suddenly increased or decreased with factors F{sub}t and F{sub}m respectively. Instability of the system parameters such as evaporator and superheat temperatures, and TEV-outlet mass flow rate followed the sudden changes. The bulb temperature remained stable. Since the evaporator and the bulb temperatures are control parameters of the TEV-outlet mass flow rate, then the instability of the latter must be mainly due to the evaporator temperature instability. The unstable region vanished completely for the 50% partial loads, and continued for the 25% partial loads. The evaporator may get flooded depending on the factors applied. For example, with the 50% partial load, the evaporator has more potential to flood when sudden decrease is applied. The new stable values showed to be different than the initial ones due to the new balanced system operating parameters.
机译：使用理论模型来研究蒸发器外部参数的突然变化对具有由恒温膨胀阀控制的干式膨胀蒸发器的制冷系统的性能的影响。分析表明，即使在稳定运行的情况下，冷冻水入口条件的突然变化也可能在一定时间内导致系统不稳定。获得了50％和25％的部分负荷的结果。入口冷冻水温度和质量流量突然分别以因子F {sub} t和F {sub} m升高或降低。系统参数（例如蒸发器和过热温度）的不稳定性以及TEV出口的质量流量随突变而变化。灯泡温度保持稳定。由于蒸发器和灯泡温度是TEV出口质量流量的控制参数，因此后者的不稳定性必须主要归因于蒸发器温度的不稳定性。不稳定区域在50％的部分负荷下完全消失，并在25％的部分负荷下继续消失。取决于应用的因素，蒸发器可能会满溢。例如，在50％的部分负载下，当突然减少时，蒸发器有更大的泛洪潜力。由于新的平衡系统操作参数，新的稳定值显示出与初始值不同。

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