变温入流条件下的U形地埋管换热能效
Heat transfer efficiency of U-shape buried pipes under variable inlet water temperature conditions
摘要：
针对变温入流工况下地埋管换热能效系数的变化特征，将其表示为最大埋管换热温差比φ与热泵机组出口水温差比σ的乘积，利用基于多极理论的U形地埋管三维传热模型，模拟分析了建筑负荷、埋管流量、主机性能对地埋管换热能效的影响规律，为优化地埋管地源热泵系统的设计提供技术支持。
Abstract：
According to the varied characteristics of heat transfer efficiency coefficient under the variable inlet water temperature condition of U-shape pipes, decomposes the coefficient into the parameter product of the biggest heat transfer temperature difference ratio of buried pipes (φ) and the outlet temperature difference ratio of heat pump units (σ). Analyses the effect of building load, buried pipe flow rate and unit performance on the heat transfer efficiency of buried pipes by using the three-dimensional heat transfer model of U-shape buried pipes based on the multi-pole theory, and provides technical support for the optimization design of ground-source heat pump systems.
Keywords:buried pipe, variable inlet temperature, heat transfer efficiency coefficient, ground-source heat pump system, heat transfer model of buried pipe