| Object:For a long time,due to the backward heating technology and the lack of heating technical guidance in southern Xinjiang,there are generally serious heating problems such as high heating energy consumption,serious outdoor environmental pollution and poor indoor comfort.Southern Xinjiang is rich in solar energy and biomass energy resources,but due to improper use of residents,the development and utilization of new energy efficiency is very low.Therefore,combining with the advantages of geographical resources in southern Xinjiang,seeking scientific energy use and various energy complementary heating methods can provide a new solution to the heating problem in southern Xinjiang.Methods:In this study,the typical residential area of 120.4 square meters of buildings of the Southern Xinjiang Corps was taken as the research object,analyzed and calculated the heat load of the buildings,and designed and selected the multi-energy complementary heating system.A set of automatic control system was developed to realize the automatic operation of the multi-energy complementary heating system coupled with solar energy,biomass energy and electric energy.With energy analysis and economic analysis as evaluation methods,the optimal control strategy of the system in different heating periods was explored through heating experiments.The TRNSYS simulation model was used to further explore the influence of operation parameters and equipment parameters on the operation performance of the heating system with solar energy fraction,effective heat collection of the collector,total boiler operation time,and total energy consumption of the system as the evaluation indicators,and the dynamic simulation analysis of the optimal control parameters of the system takes the life cycle cost as the optimization objective.Results:（1）Based on the calculation of building heat load,the main equipment parameters of the heating system are obtained:the solar collector is 24.32 m2,the biomass boiler is 15 k W,the electric heating pipe heater is 10 k W,the heat storage water tank is 3 m3,and the pipe diameter is DN25.（2）Based on the selection of multi-energy complementary heating system,the overall automatic control scheme,hardware,software,and Web cloud configuration platform of the system are designed to provide the application basis for the automatic operation of the heating system,thus realizing the automatic operation of the system and improving the safety and reliability of the system.（3）Through the operation experiment of the heating system,comparing the room temperature control strategy with the priority use of the thermal storage tank control strategy,it is found that under the condition of sufficient solar energy,the priority use of the thermal storage tank control strategy in the middle of the heating can increase the solar fraction by 10%,extend the heating time of the thermal storage tank,and reduce the operating cost and CO2 emissions of the system;At the end of the heating period,the average power consumption of heat storage tank heating for five consecutive days is only 0.22 k Wh,which can meet the indoor temperature.（4）The Hook-Jeeves algorithm is used to optimize the calculation.The upper and lower temperature difference of the collector cycle are 5℃and 1℃,the primary and secondary circuit flow rates are 24 kg/h·m2and 20 kg/h·m2,the collector area is 22.4 m2,the volume of the heat storage tank is 1.5 m3,and the minimum life cycle cost of the objective function is 191300 yuan.Conclusion:The design scheme and operation strategy of the multi energy complementary heating system constructed in this study can improve the stability of system heating,meet the indoor heat demand of residents in winter,and provide new ideas for solving the heating problems in the southern Xinjiang region. |
