Analysis Of Distributed Energy Supply System With Ground Source Heat Pump On 3E Benefits

The increase of building energy consumption in total social energy consumption is becoming more and more significant,building energy consumption is the operation energy consumption of buildings,mainly electric energy and heat energy consumption,accounting for about 1/3 of the total energy consumption of our society.Under this background,distributed energy as a new way of energy supply,which distributes on the user side and combines power supply,heating,cooling and energy storage technologies,has attracted wide attention.Combined Cooling Heating and Power(CCHP)is one of the means to realize distributed energy supply,which fully reflects the characteristics of multi-level utilization of distributed energy supply.Ground source heat pump(GSHP),as an efficient energy source with low-grade energy,coupled with CCHP,has become the research focus of researchers today,which pays attention to the environmental friendliness of the system.In this paper,the energy supply system of different types of ground source pumps is optimized and analyzed,taking economy,environmental protection and energy saving as indicators.Firstly,the principle and characteristics of each equipment model in the combined power supply system are introduced and analyzed,and the mathematical models of different equipment operation are established.Then,Dalian area is taken as the model application area,and the hourly cooling and heating load of hotel buildings in this area is simulated according to its climatic characteristics all year round.Secondly,the optimization models of single energy supply system,coupled system of ground source heat pump and CCHP-GHSP system are established;the capacity allocation of each equipment and the optimal scheduling of the whole year's operation are carried out according to the corresponding operation strategies;and then,the 3E Benefits evaluation system aiming at economy,energy saving and environmental protection is established.Then,the key operating parameters of each system,such as heating ratio and cooling ratio,are optimized and analyzed,and the necessity of setting them is explained.Sensitivity analysis of parameters such as power price and natural gas price is carried out.Finally,the system configurations of ground source heat pump(GSHP),coupled ground source heat pump(GSHP)and CCHP-GHSP systems,as well as the differences of each evaluation index and 3E Benefits are compared and analyzed,and the selection principles of different systems in practical projects are also discussed.