Study Of Combined Cooling Heating And Power System Coupled With Ground Source Heat Pump

In recent years,the combined cooling heating and power(CCHP)system has been favored by both countries and scholars for its advantages of high energy efficiency and low emission of pollutants,However,its thermal power ratio adjustable range is sma ll,excess power can not access the Internet can not be ignored;The ground source heat pump system can take advantage of a small amount of high-grade electric energy to improve geothermal energy to produce cold or heat just to make up for the lack of CCHP system,to expand its thermoelectric ratio adjustment range,increase system flexibility.In this paper,a new type of CCHP system,which is coupled by ground source heat pump and CCHP system,This system plays a role in reducing the ut ilization of fo ssil fuels,increasing the utilization of clean energy and improving the energy efficiency.First of all,in the winter working condition,the jacket water of the CCHP system is used to preheat the inlet side of the ground source heat pump to couple the two parts together;In the summer conditions,the ground source heat pump and the CCHP system are coupled in parallel;and the mathematical models are respective ly established according to the energy,mass and solute balance of each component in the system.Then,the energy efficiency and exergy efficiency of the system are calculated by adjusting the flow distribution of the jacket water in the ground source heat pump and the absorption heat pump.Based on this,the design conditions in winter and summer are determined.Under the design conditions,Under the condit ion of design,the thermodynamic performance of the coupled system was researched by changing the load factor of internal combustion engine and ground source heat pump,and the control range of ther moelectric ity ratio and the utilization ratio of energy and the effic iency of exergy efficiency were obtained.Finally,taking the comprehensive index of economy,energy effic iency and environment as the optimization objectives,the balance between the components and the capacity of each component as the constraints,the optimal allocation and operation of the system are studied.Taking a hotel in Beij ing as an example,the optima l configuration and operation of each operation mode of typical day in winter and summer are compared.The comprehensive performance of the system under optimal operation condit ion is obtained and compared with the conventional sub-supply system.