Simple equipment for measuring the coefficient of performance (COP) requires a basic thermodynamics approach and many coefficients of the gas state equation and saturated liquid line equation are affected by factors such as pressure, temperature, and volume. The coefficients used in these equations vary depending on the literature. In this study, the influence of a change in the coefficients on the precision of the COP calculation was examined. The enthalpy was calculated at seven points on the heat pump cycle, which were all reproduced adequately, with low errors, compared to the reference values. The errors of the calculated enthalpies increased when the coefficients deviated from their original values. The coefficients were changed by 14 different values between − 10 % and 10 %. However, the observed enthalpy differences between two points with similar states for either wet vapor or superheated vapor were consistent with the reference values for low values, because the same equations were used for Hou–Martin or saturated liquid lines, respectively. The absolute mean error of the COP exceeded 1.0 when the coefficients were increased by 2 %, and 0.793 at the maximum value when the coefficient decreased negatively. This worse precision could mean that different enthalpy equations were used in the process of the COP calculation, whose states were a mixture of wet and superheated vapor.

中文翻译：

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参数对R410a制冷剂性能系数估计的影响

测量性能系数 (COP) 的简单设备需要基本的热力学方法，而且气体状态方程和饱和液体线方程的许多系数都受压力、温度和体积等因素的影响。这些方程中使用的系数因文献而异。在这项研究中，检查了系数变化对 COP 计算精度的影响。焓是在热泵循环的七个点计算的，与参考值相比，这些点都得到了充分的复制，误差很小。当系数偏离其原始值时，计算的焓的误差增加。系数在 - 10 % 和 10 % 之间改变了 14 个不同的值。然而，对于湿蒸汽或过热蒸汽，在具有相似状态的两点之间观察到的焓差与低值的参考值一致，因为相同的方程分别用于 Hou-Martin 或饱和液体线。当系数增加2%时COP的绝对平均误差超过1.0，当系数负减少时最大为0.793。这种更差的精度可能意味着在 COP 计算过程中使用了不同的焓方程，其状态是湿蒸汽和过热蒸汽的混合物。当系数增加 2% 时为 0，当系数负减少时为最大值 0.793。这种更差的精度可能意味着在 COP 计算过程中使用了不同的焓方程，其状态是湿蒸汽和过热蒸汽的混合物。当系数增加 2% 时为 0，当系数负减少时为最大值 0.793。这种更差的精度可能意味着在 COP 计算过程中使用了不同的焓方程，其状态是湿蒸汽和过热蒸汽的混合物。