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Numerical Simulation of Underground Heat Exchangers under Groundwater Advection Conditons

Author: WangZhongHua
Tutor: PanJian
School: South China University of Technology
Course: Geotechnical Engineering
Keywords: Ground source heat pump Seepage Heat Seepage coupling Porosity
CLC: TU831
Type: Master's thesis
Year: 2011
Downloads: 88
Quote: 0
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Abstract


Ground source heat pump is an energy-saving, environmental protection, in line with the concept of sustainable development of air conditioning. In China, the huge consumption of resources and serious environmental pollution is the most important issue facing the current stage of development. Ground source heat pump as a source of renewable energy technologies in China has broad prospects for development. Study of ground source heat pump applications, involving the shallow hydrogeological conditions of the earth. Geotechnical physical properties affecting ground source heat pump operating characteristics; groundwater seepage from the practical point of view of theoretical research and engineering operation of ground source heat pump have a significant impact, the key factors that determine the success of ground source heat pump design. This paper first describes the characteristics of ground source heat pump, the principle and research status and progress, and then discusses a heat pump that will be involved in some of the parameters concepts and mathematical physics model. Then the soil as a saturated porous medium, and after considering groundwater seepage, establish a vertical U-tube ground heat infiltration coupled model simulation buried soil heat transfer process and ambient temperature field distribution. Papers pretreatment modeling software GAMBIT to build a physical model, numerical simulation and post-processing and numerical analysis software FLUENT. This paper analyzes the different porosity and seepage under the U-temperature field distribution around the heat exchanger, and analyze the impact of these factors on the heat exchanger thermal resistance. When no seepage, pipe temperature field around the axisymmetrical ambient thermal resistance (in winter) or decreased (summer); along the buried boundary outward temperature gradually increased, pipe center at a distance of 6.5m at temperatures close to initial geotemperature. When considering the seepage pipe to close the distance on the horizontal direction where the temperature is close to the initial temperature, thermal resistance greatly reduced, and is conducive to the heat exchanger buried and geotechnical; due to seepage existence, heat downstream migration, resulting in upstream smaller thermal resistance, the downstream thermal resistance, especially when performing well group layout to consider this factor. In addition, the seepage under the conditions of different porosity pipe small changes in ambient temperature distribution; but by day for the heat changes can be seen that the influence of porosity or larger, for less groundwater resources in the region, the porosity a greater impact on the design. However, when the need to consider groundwater seepage, as the flow velocity increases, the percolation itself Geotechnical temperature field is far greater than the impact of the porosity can even ignore the influence of porosity on the temperature field. Finally, by comparing the distribution of the temperature field in the different flow velocity obtained with the increase of the flow velocity, the ground heat exchanger thermal resistance decreases gradually and thermal resistance tends to a constant when speeds up to 5m / d. Finally chapter describes the application of ground source heat pump in Wuhan and engineering examples when the porosity values ??(This article assumes 11% reduction) the impact of the project cost and running; further description of the geotechnical parameters value the importance of system design.

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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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