Research On The Feasibility Of Using Distributed Energy Supply System For An Economic Zone In Southwest Region

With the increase of urban construction area,China’s urban building energy consumptions grow rapidly,much higher than the growth rate of the same period of energy supply.Energy has become an important development strategy in China.The supply system we studied in this paper belongs to a commercial center of the economic zone in the city.Construction Committee of the Business Economic Area makes an construction plan,which has a clear policy to improve energy efficiency and reduce building energy consumption,and builds a green,ecological,low-carbon model of economic zone.Based on the economic zone’s energy supply system as the research object,the optimization was studied by theoretical analysis.First,through the statistics of the climate design meteorological parameters of the economic zone,determine energy supply system’s cooling and heating periods,and use DeST software to simulate the buildings’ year-round air conditioning cooling load and air conditioning heat load in this economic zone.At the same time calculate the sanitary hot water heating load for the whole yearSecondly,in accordance with the annual heating and cooling load of buildings,natural gas is proposed to be used as primary energy for power generation.Choose CCHP system and river water source heat pump as compound distributed energy systems to establish an underground regional energy station.The energy station should provide centralized cooling and heating demand for the whole 800000 m2 building.Based on two systems’ process flow,CCHP system with indirect connected gas internal combustion engine and CCHP system with direct connected gas internal combustion engine directly,select the utilization of waste heat.Analyze the distributed energy systems’ operation mode in summer and winter.and ensure more efficient use of waste heat.Choosing the generator capacity by heat load,and follow this principle to compare various quantitative indicators of possible scenarios for gas engines,such as annual operating cost,total investment,proportion of comprehensive energy efficiency,waste heat utilization,annual operating hours.Using analytic hierarchy process(AHP)to sort of all programs,and select the program with the highest overall weight coefficient of internal combustion turbine.Ensure that air conditioning has first priority use of generator waste heat.Finally,calculate the average annual energy comprehensive utilization of distributed energy system.Set two energy system programs,one is CCHP and water source heat pump compound system,the other is water source heat pump systerm Compared to these two energy system programs’ internal rate of return,benefit of investment and energy consumption,we can see that the compond system with CCHP is more economical and more efficient.It is not only good to improve the overall efficiency of energy use,and response to the call of the national energy conservation and emissions reduction,but also conducive to save considerable energy costs for the enterprise and promote enterprise’s own development.