城市热网与浅层地热能复合型集中供热系统性能分析
Performance analysis of central heating system combining urban heating network with geothermal energy
摘要：
提出一种城市热网与地热能复合型集中供热系统，即在热力站处用吸收式换热机组替代常规的水-水换热器，利用一、二次网之间的大传热温差驱动热泵提取浅层地热能供热。以该系统为研究对象，建立了各部分的数学模型，对系统的性能进行了模拟分析。结果表明，吸收式换热机组的COP为1.25，在集中热源不扩容、能耗不变的情况下，该系统可提高热网供热能力25%，可以有效缓解目前北方地区集中供热热源严重不足的问题；与传统集中供热系统相比，该系统的增量投资可在4.3年左右回收，具有较好的经济性和发展前景。
Abstract：
Presents a central heating system combining the urban heating network with geothermal energy. In the heating station of this system, the water-to-water heat exchanger is replaced by the absorption heat exchange unit, through which the heat is supplied to the user. The shallow geothermal energy is extracted by the heat pump, which is driven by the large heat transfer temperature difference between the primary and secondary network. Taking the new system as the study object, establishes the mathematical models of all parts, and then simulates and analyses the performance of the system. The results show that the COP of the absorption heat exchange unit is 1.25, and the heating capacity of the heating network is improved by 25% on condition that the central heat source is not expanded and the energy consumption does not increase, which could effectively alleviate the serious shortage situation of the northern central heating source. Compared with the conventional central heating system, the incremental investment of the system could be recovered in about 4.3 years. Therefore, the system has better economic effect and development prospect.
Keywords:urban heating network, geothermal energy, central heating, absorption heat exchange unit, mathematical model, economic effect