直接膨胀式土壤耦合热泵竖直单U形管换热器优化设计
Optimal design of vertical single U-tube heat exchanger in direct expansion ground-coupled heat pumps
摘要：
考虑回油模型、换热模型、压降校核模型及制冷剂的热物性参数，建立了竖直单U形管换热器的计算机优化程序。以某工程为例，预测了优化设计参数，并分析比较了优化前后系统的COP、运行费用及初投资。
关键词：直接膨胀式土壤耦合热泵,竖直单U形管换热器,回油,管径,压降,优化设计
Abstract：
Considering the oil return model, heat transfer model, pressure drop checking model and refrigerant thermo-physical parameters, establishes an optimal computer program. With a project example, predicts the optimum values of design parameters, and analyses and compares the system COP, operational and initial costs between before and after the optimal design.
Keywords:direct expansion ground-coupled heat pump, vertical single U-tube heat exchanger, oil return, pipe diameter, pressure drop, optimal design