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Experimental analysis of R22 and R407c flow through electronic expansion valve

机译：R22和R407c流经电子膨胀阀的实验分析

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摘要

The objective of this study is to present test results and to develop a dimensionless correlation on the basis of experimental data to predict the mass flow rate of R22 and its alternative refrigerant R407c through an electronic expansion valve (EEV). The mass flow rate was measured at a series of condensing temperatures, evaporating temperatures and degrees of subcooling at the EEV inlet with five opening setting degrees of the EEV. The experimental results were analyzed, and it was found that the operation condition, flow area and the thermophysical properties of the refrigerant would affect the mass flow rate through the EEV. A new correlation based on the Buckingham n theorem was developed to predict the mass flow rate of refrigerants through the EEV. The relative deviations of the predicted value by using this correlation are from -10.74% to 9.26% for R22 and from -14.20% to 22.10% for R407c. The average deviations and standard deviations are -0.79% and 5.02% for R22 and 0.67% and 8.08% for R407c, respectively. The relative deviation was analyzed in terms of the operation condition and flow area of the EEV. This correlation can be used to predict the mass flow rate through EEVs whose largest flow area is less than 2.544 mm~2.
机译：这项研究的目的是提供测试结果并在实验数据的基础上发展无量纲的相关性，以预测R22及其替代制冷剂R407c通过电子膨胀阀（EEV）的质量流量。在一系列的冷凝温度，蒸发温度和EEV入口处的过冷度下，以EEV的五个打开设定度测量质量流量。对实验结果进行了分析，发现制冷剂的工作条件，流通面积和热物理性质会影响通过EEV的质量流量。建立了基于白金汉定理的新的相关性，以预测通过EEV的制冷剂的质量流量。通过使用这种相关性，预测值的相对偏差对于R22为-10.74％至9.26％，对于R407c为-14.20％至22.10％。 R22的平均偏差和标准偏差分别为-0.79％和5.02％，R407c的平均偏差和标准偏差分别为0.67％和8.08％。根据EEV的运行条件和流通面积分析了相对偏差。该相关性可用于预测通过最大流量面积小于2.544 mm〜2的EEV的质量流量。

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