地埋換熱系統(tǒng)水力工況及經濟性分析
[Abstract]:Ground-source heat pump (GSHP) technology has been widely used in China and other parts of the world because of energy saving, environmental protection and low carbon. In this paper, based on practical engineering cases, several kinds of connection modes of outdoor horizontal pipes are summarized, and their hydraulic distribution is calculated and analyzed on the basis of local wells. And further analysis of their respective strengths and weaknesses. This paper introduces the connection mode of horizontal pipe in underground garage (underground building), and analyzes the influence of different velocity of flow, buried depth of vertical buried pipe and length of loop on hydraulic condition of the system. Combined with the initial investment of different horizontal pipe connection modes and their basic characteristics, a more reasonable design scheme is selected to reduce the operation cost and maintenance cost of the system while meeting the design requirements. It has certain reference value for practical engineering application. Firstly, the development and application of buried heat transfer system are briefly described in this paper. Then it points out the problems existing in different degrees in the design and construction of the heat pump system in practical engineering. On this basis, the importance of the hydraulic condition and initial investment of the ground-source heat pump system is analyzed emphatically. Secondly, the theory of hydraulic condition of buried heat transfer system is analyzed, and their influence on hydraulic condition is analyzed from three aspects: hydraulic imbalance, hydraulic stability and hydraulic balance. Then the influence of pipe diameter and buried depth on hydraulic distribution is analyzed in detail. This paper summarizes several kinds of horizontal pipe connection modes in practical engineering at present and calculates and analyzes their hydraulic distribution based on the actual case of Fertilizer Township. Then, the main points of the design and construction phase of the buried heat transfer system are explained. The basic composition of buried heat transfer system is summarized, and then the layout of system well group and the connection mode of buried pipe are introduced. Through reasonable system arrangement, the local and overall water distribution of the system can be basically uniform, and the stability of the system can be improved. Every link in the construction stage is very critical. Only a safe and reliable system can make the system run under reasonable design hydraulic conditions. Finally, the economy of buried heat transfer system is analyzed. Based on the calculation and analysis of the whole and local initial investment, the characteristics of several common horizontal pipe connection modes are compared, which provides certain theoretical support for the reasonable selection of design and construction schemes under different conditions. On this basis, the operating cost of the system and energy saving and heat recovery are analyzed.
【學位授予單位】:河北工程大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:TU83
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