Study on ground-coupled heat pump applications for heating and cooling services of buildings

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Study on ground-coupled heat pump applications for heating and cooling services of buildings

 

Author: Liu, Xing
Title: Study on ground-coupled heat pump applications for heating and cooling services of buildings
Degree: M.Eng.
Year: 2011
Subject: Ground source heat pump systems.
Geothermal resources.
Air conditioning.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: ix, 10-70 leaves : ill. (some col.), 1 map ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2449806
URI: http://theses.lib.polyu.edu.hk/handle/200/6243
Abstract: This proposed dissertation focused on the operating principles and heat transfer characteristics of ground-coupled heat pump (GCHP) applications in buildings for heating and cooling. The GCHP is an energy-saving technology which uses part of the geothermal energy and the energy storage capacity of the ground for higher coefficient of performance (COP) of a heat pump for space heating and cooling of a building. However, physical arrangement of the ground heat exchangers (GHE) for a GCHP would have different effectiveness. This project is to use a simulated software package to verify the effectiveness for using this new technology for space heating and cooling in Beijing-Tianjin-Tanggu areas. The main objective of this work is to evaluate a heat pump system using the ground as source of heat. A GCHP system has been simulated and tested in the lab. Results obtained during experimental testing are presented and discussed here. The COP of the GCHP system is determined from the measured data. A numerical model of heat transfer in the ground was developed for determining the temperature distribution in the vicinity of the pipe. The finite difference approximation is used for numerical analysis. It is observed that the numerical results agree with the experimental results. An economical comparison between the GCHP and a single cooling unit plus coal-fired boiler system has been finished. Comparisons of the economic characteristics and total cost between the GCHP and other heating systems including coal-fired boiler heating proves that the GCHP system is a useful and effective one to offer the heating and cooling loads for an air-conditioned room. The software simulation provided a clear picture of the GCHP systems including the entering water temperature (EWT), exiting water temperature (ExWT), COP of the GCHP system, borehole arrangement type and so on have been reported. The heating and cooling loads for a sample building as a case study and the system performance have been obtained. The study results proved that the GCHP can satisfy all the requirements of cooling and heating in summer and winter in northern part of China for residential buildings. Therefore, the GCHP as a new energy-saving system has many benefits which are expected to be much practical for energy retrofit for space heating and cooling in buildings in this area.

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