【作者】 王思思；

【导师】 沈国民；

【作者基本信息】 华中科技大学 ， 供热、供燃气、通风及空调工程， 2008， 硕士

【摘要】 利用地能资源的地源热泵被称之为21世纪最有效的供热制冷高效绿色环保技术,以地球表面浅层地热资源作为冷热源,利用清洁的、近乎无限可再生的能源,是一种既可供热又可制冷的高效节能空调系统。地源热泵空调系统利用大地作为冷热源,通过中间介质在埋设于地下的封闭环路中循环流动,与大地进行热量交换,进而由热泵实现对建筑物的空调。国内对地源热泵的研究尚处于初级阶段,地源热泵空调系统的性能预测、系统的优化设计等方面的研究还很不完善,也缺乏相应的规范,这在很大程度上制约了地源热泵的应用。因此,本文就土壤源热泵系统展开动态仿真研究。典型的土壤源热泵是通过埋地热交换器从土壤吸热或向土壤放热。夏季空调时,室内的余热经过热泵转移,并通过地埋换热器释放到土壤中,同时为冬季蓄存热量;冬季供暖时,通过地埋换热器从土壤中取热,经过热泵将热量供给用户,同时,在土壤中蓄存冷量,以备夏季空调用。此类热泵主要包括三套系统:地下埋管换热器、热泵系统及用户末端。本文以作为地源热泵主要研究方向的土壤源热泵为研究对象,采用机理建模方法对热泵机组的压缩机、冷凝器、膨胀阀和蒸发器以及地埋管和空调末端分别建立了仿真数学模型,利用能量守恒、质量守恒定律,将其有机地集合起来,构成整个热泵机组的仿真数学模型,在对热泵机组仿真数学模型研究的基础上,耦合房间负荷及地下换热器的动态数学模型,并利用仿真软件Matlab/Simulink建立整个土壤源热泵系统的仿真模型,进行夏季运行工况的动态运行仿真,来分析了影响土壤源热泵机组运行性能的诸多因素以及预测热泵的运行特性,为系统优化设计、运行提供理论基础。更多还原

【Abstract】 The ground source heat pump (GSHP) system is a highly energy-efficient and environment-protecting system using the renewable energy, which is considered as one of the most promising air-conditioning systems and has a broad application prospect. Ground-source heat pump air-conditioning systems use middle medium planted on the ground in the closed loop in circulation, and the earth to heat exchange, thereby achieving the heat pump to the air-conditioned buildings. Domestic on the study of Ground-source heat pump is still in the initial stage, and the research of ground-source heat pump systems on performance prediction, the optimal design and other aspects is still very imperfect, but also lack of corresponding norms, which largely restricted to Ground- source heat pump applications.Typical ground-source heat pump is absorbing from the soil or releasing heat to the soil. In the summer, indoor residual heat is transferred by heat pump ,and through underground heat exchangers release to the soil and the heat is stored for the winter; in the winter, heat pump absorb heat from the soil by underground heat exchanger, then supply heat to users, while the cold is stored to the soil, preparing for summer air-conditioning use. Such heat pump system including three parts: underground heat exchangers, heat pump systems and end users.This paper is a study on ground-coupled heat pump, which is the most major research direction of ground-source heat pump; we establish a physical & mathematical dynamic simulation model respectively in accordance with the compressor, condenser, expansion valve, evaporator, underground heat exchangers and end users of the GCHP system. These models are then intrinsically assembled into a complete simulated mathematical model of the ground source heat pump set by using the laws of energy conservation and quality conservation as well, as is on the base of a simulated mathematical model of the heat pump coupled with room load and underground heat exchanger. Establish the dynamics simulation of the ground source heat pump system by Matlab/simylink to imitate the dynamic operation principle of the system in the summer, an analysis has been made of the very factors affecting the operation performance of the ground source heat pump set and the forecast of the operation of the heat pump. The conclusion provides theoretical basis to optimize the system design and operation.更多还原