Research On Energy Saving Operation Strategy Of Public Building Heating System

With the development of social economy,energy consumption is gradually increasing,in which building energy consumption accounts for a significant proportion of total energy consumption.Because of the particularity of its operation and management,public buildings have a great potential in energy saving.Therefore,the energy saving of public buildings has always been the focus of building energy saving.Due to its particularity in the process of use and management,intermittent heating is often used during the winter heating phase.In order to study the operation strategy of intermittent heating mode and the change of heat load in public buildings with different regions and different thermal characteristic parameters in different heating stages,the physical model of the case building is established in this paper.The thermal characteristic parameters of the building are set in the building model.In this paper,the De ST,simulating energy consumption.is used to simulate and analyze the case building on a time-by-time basis.Under the premise of ensuring indoor comfortable temperature,the operation strategy of intermittent heating in different heating stages of buildings with different thermal characteristic parameters in cold regions and severe cold regions,as well as the law and difference of heat load variation,are discussed.And the influence of outdoor meteorological parameters on building energy consumption is also analyzed.Through the research of this paper,the difference of the area where the building is located and the difference of the thermal characteristic parameters are the key factors affecting the operation strategy and the thermal load of the building.Through simulation and analysis,under the premise of ensuring indoor comfortable temperature during working time,the preheating time of energy-saving buildings in cold areas is 2h,2h and 1h in the early cold period,the high cold period and the last cold period,respectively.The preheating time of non-energy-saving buildings in different heating stages is 3h,3h and 2h.Under the intermittent heating condition,the heat load per unit area fluctuates greatly,and the energy saving rate is above 20%.The preheating time of energy-saving buildings in cold regions is 2h,3h and 2h in the early cold period,the high cold period and the last cold period,respectively..The preheating time of non-energy-saving buildings in different heating stages is 4h,5h and 4h,and the heat load per unit area fluctuates greatly.The energy-saving rate is above 17%.The regression parameters of building heat consumption,outdoor dry-bulb temperature and solar radiation intensity are simulated by least squares regression method.The weights of outdoor dry-bulb temperature and solar radiation intensity in different regions,heating stages and different types of buildings in the process of building energy consumption change are analyzed.According to the weights,the outdoor temperature of comprehensive weights in heating stage is calculated,and the reasons for different energy-saving operation strategies in different heating stages in cold regions and cold regions are analyzed.It is concluded that the outdoor temperature with the same heating strategy in cold regions is-2℃≤T′_out-solar<2℃,and-5℃≤T′_out-solar<0℃in cold regions.Intermittent operation strategy with preheating time of 2 hours can be recommended for energy-saving buildings in both regions when the comprehensive weight outdoor temperature is-5℃≤T′out-solar<0℃.The research results in this paper can provide some theoretical guidance for energy-saving operation strategies of public buildings in cold areas and cold areas in winter.