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The Application of Finite Element Method of Lines in the Research of Ground-Coupled Heat Pump under Ground Heat Exchanger within Transient Thermal Field

Author: HuangQiHua
Tutor: GaoJianLing；BaiYuXing
School: North China University of
Course: Structural Engineering
Keywords: Finite Element line method Ground source heat pump Transient temperature field COLSYS Axisymmetric unit Heat Transfer
CLC: TU831
Type: Master's thesis
Year: 2010
Downloads: 83
Quote: 1
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Abstract


This is the finite element method the transient temperature field analysis. Finite Element line method is a semi-analytical analysis method, since the early nineties of the last century, there have been many scholars and experts committed Finite Element line method applied research in the field of solid mechanics and considerable achievements. In recent years, our research group has been working to expand the application fields of Finite Element line method to heat transfer, and made a series of achievements, the chronological plane unit, unit analysis axisymmetric finite element of the steady-state temperature field line method calculation program. This article continues the line of the finite element method extends to the field of transient temperature field analysis. Therefore, the main work is the analysis of transient temperature field. In this article, will study the case of no internal heat source due to thermal conductivity and heat transfer problems, the temperature of the system, not only with its change of position in space, but also change over time, which the non-steady-state heat conduction process. Line method using the finite element space semi-discrete, already axisymmetric unit, flat unit; time discrete backward difference method, the backward difference greater error compared to the CN format, Galerkin format, but backward difference scheme is unconditionally stable and will not oscillate in △ t step also, Since this is the first time into the transient temperature field analysis, backward difference is more appropriate. This program is written in Fortran, and Fortran software to run the computer system installed. In order to facilitate the input and reading results, most of the program input and output data through txt document. The variable declaration modular form, and subroutine try to make the program structure clear, with a description of a large number of statements, and thus increase the readability of the program. Switch the variable array to save memory and improve computing speed. The program selection COLSYS ordinary differential equation solver, inherit and develop the achievements of their predecessors, so the program can also calculate the steady-state problem. The user can enter the desired coordinates of any point within an arbitrary time point and the computation time can be output, by calculating the corresponding calculation results. And the calculation process documentation, you can view and test the entire calculation process. Ground source heat pump pipe the design includes tubewell spacing, tubewell depths and tubewell number. Prior to this, you need to calculate the ground heat exchanger heat transfer, which involves on the ground to change the soil thermal properties, the buried pipe in the form of heat, and the heat transfer model. This article line with finite element method axisymmetric element analysis of temperature field of the vertical ground source heat pump underground heat exchanger buried around the system, a heating period for a period of time, backward difference time difference scheme discrete time selection, choose the appropriate time step simulation of transient temperature field, and thus a more accurate understanding of the heat surrounding the distribution of temperature field, to provide a reference for the design of the underground heat exchanger of ground source heat pump.

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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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