Optimization Of School Heating (cold) Plan Based On Load Characteristics

Correctly predicting the load characteristics of a building is the basis for the choice of cold and heat source options and their optimization,and it is also an important basis for the control of the operation of the system in the later period.For campus area buildings,its load changes with the use of functions,hours,and usage rates of the individual buildings.The load characteristics of the campus are the combined results of multiple buildings combined together.This article takes the campus of a university in Beijing as an example.Through research,it obtains the schedules and use characteristics of different functional buildings in the campus.It combines the current energy management and control methods of the campus and winter heating operation control measures,and takes into account the winter and summer vacations of the school,using the DeST software to model the different functional buildings in the school district respectively.According to the room function and schedule,set the indoor temperature in different time periods.Through the simulation,obtain the 8760 h hourly cooling and heating load data report of each monomer building.According to the simulation of cooling and heating loads and the basic electric in the school district,it can be seen that there is a clear peak in the load between the school building and the student dormitory building.Finally,the time-dependent cooling and heating loads of different functional buildings are superimposed to obtain the whole year hourly cooling and heating load of the school district.Based on the characteristics of the load,this paper studied the campus' s conventional programs and renewable energy options and analyzed the energy saving conditions of combined cooling heating and power program comparing to the conventional program,finally the options of gas boiler + split air conditioner,ground source heat pump + gas boiler + split air conditioner and combined cooling heating and power + ground source heat pump + gas boiler + split air conditioner were selected respectively,using dynamic calculation methods to calculate the annual operating energy consumption of each program and making a comparision from economic,energy saving and environmental protection and other aspects for the three schemes and the impact of energy prices on the energy consumption costs of the system during the year was analyzed.The results show that under the benchmark scenario of the first option,the incremental investment recovery period of the third option is the shortest,which is 9.2 years.Considering the energy conservation rate,the third option can save 1590 tons of standard coal annually,and the energy saving rate is 32.4%.In respect of carbon emissions,the annual reduction of 2131.3 tons for the second option and 3912.2 tons for the third option and the energy efficiency of the third option can reach 84%.Therefore,under the current energy charging standards for the school district,through the comprehensive evaluation of different programs,the third option has good energy-saving and environmental benefits in schools and high energy efficiency,but the initial investment is high and the incremental investment recovery period is long,which increases investment risks.This article not only provides a method for school load analysis,but also provides a reference for the selection and optimization of school cold and heat source programs in northern regions.