Research On Configuration And Operation Strategy Optimization Of Heating System With Electricity As The Core

In 2019,China’s building sector accounted for about 33%of the total social energy consumption,and the total carbon dioxide emissions accounted for about 38%of the total social emissions.The electricity consumption for building operation is 1.89 trillion k Wh,and the zero-carbon electricity generated by clean energy accounts for about 30%,and the rest is coal-fired gas-fired electricity.With the development of the"coal-to-electricity"project,my country is gradually replacing traditional coal-fired boilers and using electric equipment for heating.However,at the same time as power growth,due to the large difference in demand for electricity between peaks and valleys,the waste of electricity in the valley period gradually increases.In this regard,our country proposes a method of"shaving peaks and filling valleys"to relieve the pressure on the power grid.The state has issued a number of policies to encourage all types of enterprises to actively implement electric heating,research and explore new energy and clean energy power generation,and gradually expand the proportion of thermal storage and heat pump heating.Beijing has also introduced a peak-valley electricity price policy,which provides favorable support for the use of valley electricity.As a clean heating method,air source heat pump heating has developed rapidly in the"coal-to-electricity"project.However,how to optimize the system configuration and operation strategy according to the characteristics of building load is worthy of our continuous exploration.This paper firstly introduces the operation principles and advantages and disadvantages of the electric boiler heating system,the electric boiler regenerative heating system,the air source heat pump heating system and the air source heat pump regenerative heating system.and the total life cycle cost for a simple economic analysis.The results show that the air source heat pump thermal storage heating system has obvious economic advantages under a certain peak and valley electricity price.In order to study the operation characteristics of the air source heat pump regenerative heating system,this paper first uses the TRN-Build tool to build a 35000m²office building model to obtain the hourly heat load in the heating season.Then use TRNSYS simulation software to build the thermal storage heating system model.The optimal configuration of the system is studied by orthogonal test method.Taking the rated heat capacity of the heat pump unit,the volume of the hot water storage tank and the full storage temperature as the influencing factors;the cumulative electricity consumption and annual cost of the heating season as the evaluation indicators,25 sets of experiments were carried out and the optimal configuration scheme was selected.The optimal configuration scheme is obtained as follows:on the basis of the conventional scheme designed according to the regulations,the rated heat capacity of the heat pump is selected to be 0.8 times,the volume of the hot water storage tank is selected to be 0.9 times,and the full storage temperature is 53°C.The results show that the optimal configuration scheme reduces the cumulative electricity consumption by 2%compared with the conventional scheme,and the annual cost is reduced by 11.2%.On the basis of the optimal configuration scheme,the system operation strategy is optimized.The operation strategy is:according to the heat load required for the next day,the full storage temperature of the day is determined.The results show that the optimal configuration scheme after the optimization of the operation strategy reduces the cumulative electricity consumption by 8.7%in the heating season;the cumulative electricity cost is reduced by 5.4%.Finally,this paper takes an office building in Beijing as the research object,conducts a field test on the gas boiler heating system of the building,and obtains the operating energy consumption of the system.Then,according to the optimal configuration and optimization strategy method of the air source heat pump heat storage heating system in Chapter 4,the heating system model is built,and the TRNSYS simulation results are obtained.The comparison results of the two systems show that:compared with the gas boiler heating system,the air source heat pump regenerative heating system reduces the standard coal consumption in the heating season by 70.28%;the CO₂ emission reduces by 536.33 tons;the total life cycle cost is reduced by 29.51%;Economic goodness increased by 11.02%.