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Study on Inner Heat Source of Underground Heat Exchanger and the Ground Coupled Heat Pump’s Performance

Author: LiXinGuo
Tutor: MaYiTai
School: Tianjin University
Course: Engineering Thermophysics
Keywords: Ground source heat pump Underground heat exchanger Internal heat source Quasi - steady-state simulation Fuzzy Intelligent Control Heat exchange unit well depth costs
CLC: TU833
Type: PhD thesis
Year: 2004
Downloads: 1065
Quote: 24
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Abstract


In this paper, the internal heat source type underground heat exchanger theoretical model to study the establishment of the physical and mathematical models of the internal heat source type buried soil heat and moisture to pass around the heat exchanger. Different from the conventional heat transfer model, the internal heat source model to consider soil type, thermal properties and moisture migration and other factors, will be buried in the soil, the heat exchanger processing equivalent internal heat source, to carry out the underground heat exchanger and the surrounding soil biography Numerical simulation of heat and temperature. First single U-shaped vertical ground heat exchanger in different soil physical properties, heat transfer and temperature field of soil around the different operating conditions to carry out the numerical simulation. Another row and then focus only take the heat of the U-shaped vertical ground heat exchanger pipe group, analog or only exclusive hot single-season operating conditions of heat transfer and soil temperature change, and both take heat hot double cropping operating conditions under heat and soil temperature change, long-term operation of the heat exchanger performance, effectiveness and service life analysis of underground pipes. Buried heat exchanger performance is the basis of the application of ground source heat pump design, establish on-site experimental system for different buried underground heat exchanger, such as the well pipe pile pipe, single U, double U-tube, to carry out experimental research, study different soil physical properties, different backfill material, the number of different buried, and different operating conditions of a single well heat exchanger performance. Single well based on the study of the heat exchanger, and the Tianjin ecological residential buildings use characteristics and local hydrogeological conditions, the establishment of the experimental system set by the pile pipe and well pipe underground heat exchanger of ground source heat pump demonstration projects portfolio . The system developed a set of computer data acquisition and monitoring system, the data acquisition of the entire ground source heat pump system. On this basis, to carry out ground source heat pump air conditioning in summer and heating in winter, experimental study of the operating characteristics of the variation of the key research cycle performance of ground source heat pump system, the underground temperature and thermal energy storage. GSHP system simulation study, the mechanism modeling method, and the introduction of fuzzy intelligent control method of the analysis of ground source heat pump system parts: building underground pipes - single screw water source heat pump - the relationship between the heat exchanger and the use of modular modeling method of ground source heat pump system, the establishment of the physical model and the quasi-steady-state mathematical model. Different from conventional simulation scrambling climacteric or non-steady-state simulation, the first time the amount of outside interference for the dynamic simulation of continuous change, Matlab / Simulink platform preparation emulator simulated winter conditions, and The experimental values ??for comparison to verify the correctness of the model. The paper first proposed a heat exchange unit depth cost indicators, the indicators comprehensive evaluation analysis of the heat exchanger, the heat exchanger performance and economy. Analysis of ground source heat pump with conventional heating and air conditioning mode of economic analysis of ground source heat pump, energy saving and environmental protection. The purpose of this paper is the application of ground source heat pump technology, a combination of different geological conditions, building structure and regional meteorological conditions to carry out exploratory research, and look forward to the application and popularization of the ground source heat pump has a guiding value.

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CLC: > Industrial Technology > Building Science > Housing construction equipment > Air-conditioning, heating, ventilation,and its equipment > Heating
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