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Study on Application Characteristics of Ground-coupled Heat Pump Systems with Solar Thermal Collector in Beijing

Author: PanYuLiang
Tutor: XuWei
School: China Academy of Building Research Institute
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Solar Ground source heat pump The average soil temperature TRNSYS
CLC: TU831
Type: Master's thesis
Year: 2010
Downloads: 243
Quote: 0
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Abstract


Ground source heat pump technology as a new HVAC use of renewable energy technologies, energy-efficient technology is common in the field of building energy conservation international. Currently, one of the hot topics of the ground source heat pump technology research at home and abroad is a hybrid system combining with other hot and cold sources. However, due to the geographical conditions, the cost of the system, and climate characteristics, integrated technical characteristics and other reasons, the conclusions of the study abroad are not necessarily applicable to China's specific national conditions. Therefore, this research project adaptability and economy of the hybrid system of solar assisted heat source in the cold northern climate conditions, in order to provide reference for practical engineering design. From ground source and solar angle of the composite heat source, do the following research: ① Select the Beijing area monomers low density buildings baseline building using TRNSYS software modeling year hourly load simulation; ② according to specification as well as the actual situation, a ground source heat pump system, solar system design and the selection of some of the key parameters discussed; ③ TRNSYS software platform, namely the establishment of a ground source heat pump system, a hybrid system two modes of operation computing model; ④ select different drilling depth, select a few representative parameters, comparative analysis of the composite system with respect to a separate pipe system to enhance the role of the system performance and optimal operating mode selected; ⑤ the use of the optimized analysis software, full life-cycle cost minimum as the objective function, the choice Hooker - Katsuo optimization algorithm, optimized analysis of the economics of a separate pipe systems, hybrid systems; ⑥ underground temperature field of a ground source heat pump system trends and patterns of analysis and discussion. The main conclusions of this paper: (1) the poor operating conditions of the ground source heat pump system heating season, such as pipe size is not enough, the hybrid system can significantly improve the operating performance of the system; ② run mode optimal , pure winter heating case use of solar energy as an auxiliary heat source, this operating mode can be used as the preferred program of practical engineering design and operation; (3) the design of the underground heat exchanger system that takes into consideration the annual import and export temperature and ground heat cost the influence; ④ average soil temperature as a preferred parameters of the forecast system health. The ground temperature decrease with underground heat exchanger drilling costs related to conducting ground source heat pump system design, run the end of the period allowed under the conditions of this research, this value is about 2.0 to 2.4 ℃. Otherwise, we should increase the size of the underground heat exchanger or additional auxiliary heat source; ⑤ to select the design of solar energy systems in accordance with the principles of the heating season complement hot, not economic. Seasonal heat storage and other measures should be considered to reduce the the collector area selected, in the non-heating season by providing domestic hot water and other ways to maximize the use of solar energy systems; ⑥ conditions for application of the hybrid system should be in all causes ground heat exchanger size is not enough. Limited conditions, the paper only the health of the Beijing area solar - ground source heat pump system simulation studies, the results have yet to be experimental confirmation. The results of this thesis can provide a reference for solar - ground source heat pump system design, operation, and management.

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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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