| With global problems such as limited energy resources and environmental pollution becoming more and more serious,as well as the increasing demand for hot and cold electricity,the development trend of new energy and renewable energy grows rapidly,and development of clean energy has become a great development strategy of our country.Therefore,this paper proposes a multi-energy complementary regional energy supply system that combines solar energy,air energy and phase-change energy storage,which improves the utilization rate of clean energy,alleviates the mismatch between supply and demand of clean energy,reduces greenhouse gas emissions,and further realizes the goal of zero carbon.First of all,based on the cold region of jilin city outdoor meteorological conditions,a business park in jilin city buildings as the research object,using the De ST software to simulate the park construction hourly cold hot electric load calculation,get the heat load of 1.61×1010k J,treatment of annual accumulative total annual accumulative total cooling load of 4.15×109k J,Electric load treatment of annual accumulative total of 11×109k J.Hourly peak heat load is7,504.93k Wh,hourly cooling load is 4,041.11 k Wh,hourly electrical load is 983.98k Wh.Then,based on the load data calculated by simulation,the characteristics of the cold,hot and electric loads of the park buildings were analyzed respectively in typical days,hottest months,coldest months and month by month throughout the year.And the load characteristics of the system are analyzed.Secondly,a set of multi-energy complementary regional energy supply system based on phase change storage is designed in this paper.The operating principle,operating mode and control strategy of the system are introduced in detail.The system is divided into three subsystems:heating,cooling and power supply.According to the load results,the main equipment parameters of the system were selected,and TRNSYS was used to build the simulation platform of multi-energy complementary system.Based on the simulation results of the system,the winter typical day and summer typical day of the operation of each equipment and phase change storage tank phase change process,as well as the system in the heating season and refrigeration season of each equipment monthly heat production,monthly cooling capacity and monthly load demand matching situation,and the system monthly solar guarantee rate,monthly heat pump energy efficiency ratio were analyzed.In addition,the heat production,cooling capacity and electricity supply of each equipment in the multi-energy complementary energy supply system for one year are defined,as well as their proportion to the total annual cumulative heat production,cooling capacity and electricity supply.The results show that the performance coefficient of the system in heating season is 2.5 and that in cooling season is 2.59.Finally,the structural parameters of each component of the complementary energy supply system were optimized and the Design variable data set was generated by using the Design Experts software according to the predefined range of design variables.The proxy model of the objective function is established by RSM method,and the accuracy of the model is verified.The objective function is optimized to determine the optimal configuration of the system.The optimized parallel single row collector area is 29 m2,the volume of single phase change heat storage tank is 30 m3,the COP of heating air source heat pump is 2.9,the COP of cooling air source heat pump is 3.9,the volume of single ice storage tank is 14 m3,and the area of photovoltaic field is 116032 m2.The capacity of a single battery is 106 k Wh.After the system optimization,the COP of the optimized energy supply system is 5.75,the power price in the cooling season is 9820.25 yuan,and the primary energy saving rate of the system is 60.06%. |
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