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A Study of the Characteristics of Ground Heat Exchanger under the Coupled Heat Conduction and Groundwater Advection Conditions

Author: LiuDongLin
Tutor: ZhouXun
School: Chinese Geology University (Beijing)
Course: Groundwater Science and Engineering
Keywords: Ground source heat pump Ground heat exchanger Groundwater seepage Water - thermal coupling Geothermal energy
CLC: TU831
Type: Master's thesis
Year: 2011
Downloads: 95
Quote: 1
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Abstract


The soil stream of heat pump for an environmentally friendly, energy-saving, efficient ground temperature air conditioning technology, also has a low noise, durable, reliable and very comfortable. Can be widely used in public buildings, commercial buildings, residential apartments, hospitals, schools and other buildings. Ground source heat pump technology for the sustainable development of our country, even to solve the problem of environmental pollution and energy crisis two global opportunity. Ground heat to the exact design of the heat exchanger is to ensure efficient ground source heat pump system, the key to stable operation. Ground heat and the heat exchanger of the surrounding soil is a combination of problems involving HVAC and hydrogeology. On the one hand, the thermal properties of the soil affect important factors pipe heat exchanger; On the other hand, groundwater seepage ground heat exchanger design factors can not be ignored, existing mathematical calculation models consider the impact of groundwater seepage, so that the ground heat exchanger design heat transfer than the actual large initial investment for the entire heat pump system. This paper describes the research status of ground source heat pump, a summary of existing heat transfer model and the soil as porous media, water seepage conditions - thermally coupled to the heat transfer process using mathematical formulas are derived. The thesis adopts the software Comsol3.5a numerical simulation to establish a physical model of the single U-tube simulation soil thermal conductivity λ = 1.5,3,4.5, porosity Φ = 0.1,0.3,0.6 and different groundwater velocity distribution of soil temperature impact, and made according to the size of the Pe values ??as to whether to consider the standard of the convective heat transfer simulation results derived by a single U tube buried spacing of 2.4 m will be able to avoid the phenomenon of thermal interference. The establishment of a cross-shaped Buried group physical model simulation results based on single U tube, the flow velocity v = 1e-6 m / s simulation calculated the cross-shaped arrangement of thermal interference phenomenon better than the matrix arrangement. In this paper, based on Darcy's law to build indoor heat exchanger sand box, the nine brass heat exchanger U-tube uniform rectangular arranged to simulate the ground with sand between the heat exchanger. U-tube 68 hours in the dry sand, saturated and seepage under the conditions of heat transfer experiments, the experimental results show that: the U-tube heat exchanger in the seepage under the conditions of a temperature difference of 5 ° C, significantly greater than the saturated sand conditions under temperature difference of 3 ° C and dry sand 1 ℃. And found through experiments under flow conditions on the downstream, upstream U-tube heat interference phenomenon.

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