【作者】 施恂根；

【导师】 苏华；

【作者基本信息】 西华大学 ， 供热、供燃气、通风及空调工程， 2008， 硕士

【摘要】 地源热泵是一种可再生能源利用技术,近年来为我国研究热点。其中的关键是地下换热器的设计与安装,因此地下换热器一直是研究的重点。主要研究内容如下:(1)采用地下土壤原始温度场的模型,计算成都市地区不同深度的土壤温度变化,并分析了地表温度变化对土壤温度分布的影响。(2)对地源热泵地下换热模型进行了归纳总结,并建立了竖直双U型管地下换热器周围土壤温度场物理模型和数学模型。(3)采用ANSYS有限元APDL语言进行编程,并对竖直双U型管地下换热器周围温度场进行模拟,通过模拟分析得到了土壤热物性、管外温度、土壤类型以及回填料等因素对土壤温度场的影响。(4)采用ANSYS有限元APDL语言进行编程,并对群井地下换热器周围土壤温度场在全年内进行连续模拟,得出了全年每个月的温度场的变化。(5)采用VB语言编程,开发了竖直地下换热器设计程序,可计算得出单U型管和双U型管单位井的换热量以及井的深度。本文所提供理论模型、有限元数值计算的方法以及竖直地下换热器的设计计算程序,将为地源热泵工程的实际应用和进一步研究提供理论依据和参考价值。更多还原

【Abstract】 Ground source heat pump is one kind of the utilization of renewable energy technology, which has been research focus in China in recent years. Key is the design and installment of underground heat exchanger, which has been research emphasis. The main research contents of this paper are as following:(1) A original heat transfer model of the soil temperature field was adopted. The soil temperature different depth was calculated in Chengdu. The effect of soil temperature surface on the distribution of soil temperature was analyzed.(2) And models of ground heat exchange for ground source heat pump were reviewed and summarized. The physical and mathematical model of the heat transfer was established for vertical two U-tube for ground heat exchanger.(3) Vertical two U-tube ground heat exchanger was simulated by ANSYS using APDL language. Effects on soil temperature field of soil thermal physical properties、external tube temperature、soil type and different material of backfill etc were obtained.(4) The heat transfer around Multiple-well for ground heat exchanger was simulated by ANSYS using APDL language. Monthly variation of temperature field was obtained.(5) A program for the design of vertical ground heat exchanger was developed using VB. It can calculate heat transfer rate per depth of single U-tube and double U-tube and the depth of well.The theoretical model、numerical calculation method and the program for the design of vertical ground heat exchanger are helpful to further study on ground source heat pump.更多还原