Study On Suitability Of Solid State Electric Heat Storage In Campus Buildings In Severe Cold Region

In recent years,with the rapid development of the national economy,the demand for non-renewable energy such as coal is getting higher and higher,while the output value of it is decreasing year by year.At the same time,China’s wind curtailment rate and water curtailment rate both remain high,and a lot of clean electricity is wasted.China’s electricity peak-to-valley ratio is only 1:0.07,and the solid heat storage and low valley electric heating can effectively balance the power grid and achieve the effect of cutting peaks and filling valleys.The topic in this paper is under the guidance of national document "Guidance on promoting clean heating in town areas in northern heating areas"(City Construction[2017]No.196)and the Liaoning Provincial Government Document " Notice on Promoting the Three-Year Rolling Plan for Clean Heating in Liaoning Province(2018-2020)"(Liao Zheng Ban Fa[2017]No.116),commissioned by the Liaoning Provincial Department of Housing and Construction.Taking Liaoning Province primary and secondary school buildings and university buildings as research objects,simulating and analyzing the feasibility of solid heat storage electric heating systems which using clean electrical energy such as wind power and photovoltaic power in terms of energy consumption,economic benefits and environmental benefits.Based on the investigation and analysis of the heating status in various regions of Liaoning Province,this project uses Sketch-Up to establish the architectural model for selected primary school teaching buildings,middle school teaching buildings,middle school student apartments,college teaching buildings,and college student apartments.Using EnergyPlus,the simulation results are given to show the energy consumption of various buildings under solid heat storage electric heating systems.When the five types of buildings adopt the solid electric heat storage system,the standard coal consumption per unit area during the heating period is:1.91kgce/m2,2.21kgce/m2,4.21kgce/m2,3.01kgce/m2,6.72kgce/m2.It is concluded that compared with the municipal heating network heating system,the solid heat storage electric heating system is more energy-efficient.The order of energy saving from high to low is:primary school teaching buildings>middle school teaching buildings>college teaching buildings,middle school student apartments>>college student apartments.Based on the energy consumption simulation analysis,the economic and environmental benefits of the solid heat storage electric heating system applied to the above five types of buildings are studied.The annual operating cost of various building units by using solid electric heat storage heating system is 11.06 yuan/(a·m2),11.87 yuan/(a·m2),18.2 yuan/(a·m2),13.83 yuan/(a·m2),23.68 yuan/(a·m2).Annual value per unit area of various building units by using solid electric heat storage heating system is 21.4 yuan/m2,22.21 yuan/m2,28.53 yuan/m2,24.16 yuan/m2,34.02 yuan/m2.The analysis results show that the economic benefits are ranked from high to low in college teaching buildings>primary school teaching buildings>secondary teaching buildings>secondary student apartments>college student apartments.From the perspective of environmental benefits,the CO2 emission reduction of the most important pollutants per year in the solid electric heat storage heating system is extremely high.The reduction of CO2 emission per unit area during the heating period of the five above types of buildings is 9.855 kg/(a·m2),10.127 kg/(a·m2),16.524 kg/(a·m2),6.818 kg/(a·m2),10.325 kg/(a·m2).Therefore,the environmental benefits are ranked from high to low as secondary school student apartments>college student apartments>middle school teaching buildings>primary school teaching buildings>college teaching buildings.After analysis,the solid heat storage electric heating system which using wind power and other clean electric energy is proved to be practical in all types of primary and secondary school buildings,college student apartments and college teaching buildings under the set conditions.Due to the flexible use of teaching buildings in colleges and universities,the energy conservation of solid thermal storage electric heating systems in different university teaching buildings needs to be further analyzed according to actual working conditions.