استراتژی بهره برداری بهینه از سیستم گرمایش ترکیبی متشکل از پمپ های حرارتی سانتریفوژ و دیگ های بخار گاز

Centrifugal heat pump has to be coupled with gas boiler to supply high temperature water in radiator heating system. Regarding to hybrid heating system (HHS), operation strategy has significant impact on its annual energy consumption and cost. In this paper, the optimal operation strategy of the HHS composed of sewage-source centrifugal heat pumps and gas boilers was analyzed. Firstly, the performance models of the system components, including terminal radiator, heat pump, gas boiler and water pump were established respectively. Secondly, with the aim at minimizing the operating cost of the system the optimal operation strategy of the system was analyzed. Finally, the annual operating cost and energy consumption of the HHS were compared with these of coal-fired boiler heating system. The results indicate that the HHS offers significant reductions in energy consumption (45.2%) and operating cost (13.5%). Therefore, the HHS has a promising application prospect, the results provide reference for scientific operation of the HHS.

China's rapid economic growth is inevitably accompanied by serious environmental problems, such as pollution, energy shortage and climate change [1]. In China, approximately 27.8% of the primary energy is consumed in non-industrial buildings [2]. In Northern China, 36% of the total building energy consumption is utilized for heating in urban areas [3]. Efficient energy use is considered to be a solution of addressing fossil fuel depletion, energy security, and global warming [4].

This paper presents a method for analyzing the optimal operation mode of a HHS. The operation strategy analysis for a HHS can provide simple and reasonable technical support for improving energy efficiency and decreasing operating cost. The main conclusions of this study can be summarized as follows. COP is the function of the load ratio, the outlet water temperature of the condenser and evaporator. Based on the function, energy consumption of heat pump in different operating conditions can be obtained easily.