Investigation on ground coupled heat pump application in the Guangdong region

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Investigation on ground coupled heat pump application in the Guangdong region

 

Author: Sun, Jiaju
Title: Investigation on ground coupled heat pump application in the Guangdong region
Degree: M.Eng.
Year: 2014
Subject: Ground source heat pump systems.
Dwellings -- Heating and ventilation.
Hot-water heating.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: ix, 67 leaves : color illustrations ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2760619
URI: http://theses.lib.polyu.edu.hk/handle/200/7641
Abstract: Although ground coupled heat pump (GCHP) systems are becoming attractive air-conditioning systems in some regions in recent years, the significant drawback for their wider applications is the high initial cost. Besides, more energy is rejected into ground by a GSHP system installed in cooling-dominated buildings than the energy extracted from ground on an annual basis so that imbalance can result in the degradation of system performance. One of the available options that can resolve these problems is to apply the ground-coupled heat pump (GCHP) systems with supplemental heat rejecters for rejecting extra thermal energy when they are installed in cooling-dominated buildings. This paper presents a practical hourly simulation of the GCHP system by modeling the heat transfer of its main components. The computer program developed on this hourly simulation model can be used to calculate the operating performance of the GCHP system according to the building load. The design methods and running control strategies of the GCHP system for a sample building are investigated. The simulation results show that a properly designed GCHP system can effectively reduce both the initial cost and the operating cost of an air-conditioning system compared with the traditional GCHP system used in cooling-dominated buildings. A ground-coupled heat pump (GCHP) with domestic hot water (DHW) supply has been proposed in this paper for space cooling/heating and DHW supply for residential buildings in hot-climate areas. A sample system, applied for a small residential cottage located in Guangdong, is hourly simulated for a typical meteorological year. The conventional GCHP system and an electric heater for DHW supply are also modeled and simulated on an hourly basis for comparison purpose. The results obtained from this case study show that the GCHP system can effectively alleviate the imbalanced loads of the ground heat exchanger (GHE) and can offer almost 95% DHW demand. The energy saving for DHW heating is about 70% compared with an electric heater.

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