地埋换热系统水力工况及经济性分析

发布时间：2018-08-09 18:43

【摘要】：土壤源热泵技术响应了节能，环保，低碳的号召，在我国以及世界其他地域被广泛应用。本文主要以实际工程案例为依托，归纳了目前实际工程中常见的几种室外水平管的连接方式，在局部井群基础上，设计计算并分析它们的水力分布情况，并进一步分析他们各自优缺点。介绍了地下车库（地下建筑）的水平管连接方式，分析不同流速、垂直埋管埋深、环路长度等方面对系统水力工况的影响。结合不同水平管连接方式的初投资以及它们的基本特点，选取一种较合理的设计方案，使系统在满足设计要求的同时，降低运行成本和维修成本，对实际工程应用有一定参考价值。首先，本文简述了地埋换热系统的发展与应用。然后指出了在实际工程中，热泵系统在设计和施工阶段不同程度存在的问题，在此基础上，重点分析土壤源热泵系统水力工况和初投资的重要性。其次，对地埋换热系统的水力工况理论进行了分析，分别从水力失调、水力稳定性以及水力平衡三个方面出发，分析了他们对水力工况的影响。然后以管径、埋深等若干方面来具体分析其对水力分布的影响。汇总了目前实际工程中常见的几种水平管连接方式，以肥乡实际案例为依托来计算分析它们水力分布。然后，对地埋换热系统的设计和施工阶段的要点进行说明。概述了地埋换热系统的基本组成，然后介绍了系统井群的布置和地埋管连接方式。通过合理的系统布置，能够使系统局部和整体水量分布基本均匀一致，提高系统运行稳定性。施工阶段的每一个环节都很关键，安全可靠的系统，才能够使系统在合理的设计水力工况下运行。最后，对地埋换热系统经济性进行分析。从整体、局部初投资进行计算分析，对比了常见几种水平管连接方式的特点，为不同情况下合理选取设计施工方案提供一定理论支持。在此基础上，分析了系统运行费用和节能热回收。
[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.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU83

【相似文献】