| In the face of the increasing energy consumption of air conditioning systems and the goal of achieving carbon neutrality as soon as possible,ensuring that people’s living environment to meet the comfort requirementsit,it is important to change the energy supply method of buildings.Therefore,the paper proposes an air conditioning energy supply system combining trigeneration and ice storage,which has the advantages of high energy efficiency,peak and valley reduction in summer,and reduction of dust,carbon dioxide and Freon emissions,so conducts a detailed study on it.Firstly,a comprehensive class A office building in Guangdong with a total construction area of 29,467 m~2,a cooling area of 20,200 m~2and a heating area of11,983 m2 is selected for the study.Using Sketchup to build the 3D model of the office building,and then importing TRNBuild to build the load calculation model of the building as well as solving it according to the time-to-time outdoor meteorological parameters and indoor thermal disturbance information of Guangzhou,the basic air-conditioning load of the office building is about 1,637 kW in the cooling season and about 400 kW in the heating season.The integrated cooling load index is100 W/m~2,and the integrated heat load index is 35 W/m~2.The maximum cooling load is 2008 kW,the maximum heat load is 425 kW,and the electricity load of the office building ranges from 750 to 1750 k VA.Secondly,in order to highlight the superiority of the trigeneration system proposed in this paper and to form a comparative analysis with it,the paper introduces the principle of the traditional energy supply system in detail,the system is built in TRNSYS after equipment selection,and studies the cooling and heating capacity,energy consumption and energy efficiency ratio of the system throughout the year in detail,it finds that the heat production of the gas boiler is 58,874.49kWh,the cooling capacity of the chiller is 3211937.47kWh and the natural gas consumption is 6,776.11m~3,and the primary energy converted electricity consumption is85,3308.29kWh,as well as the primary energy conversion power consumption is878979.34kWh through simulation.By analyzing the energy efficiency of the system,the average COP of the chiller is 5.98,and the system COP of the whole year is 3.72.Again,the same method as above is used to simulate and analyze the cooling and heating capacity,system energy consumption and system energy efficiency of trigeneration system.The heat supply of the heating plate exchange is 59433kWh,the cooling capacity of the lithium bromide unit(hot water condition)is 929713kWh,and the cooling capacity of the lithium bromide unit(flue gas condition)is 351442kWh,the cooling capacity of the electric chiller(conventional condition)is 769049kWh,as well as the cooling capacity of the electric chiller(ice storage condition)is1508194kWh.Through energy efficiency calculation,the system COP of the trigeneration system is 4.43,and the annual average COP of the lithium bromide unit is 0.89 as well as the annual average COP of the electric chiller is 4.54.Finally,a detailed comparison between the above-mentioned traditional energy supply system and the trigeneration+ice storage system is conducted in terms of energy saving,economy and environmental protection,and it is found that the energy saving rate of the traditional energy supply system is 11.76%and the annual operation COP is 3.72;the energy saving rate of the trigeneration+ice storage system is 19.6%and the annual average COP is 4.43.From the economic point of view,the initial investment of the traditional energy supply system is 6.06 million yuan and the static payback period is 3.7 years;the initial investment of the triple-supply+ice storage energy supply system is 7.3996million yuan and the static payback period is 2.74 years,so the system is more economical.From the perspective of environmental protection,it can be seen that the traditional energy supply system generates a large amount of carbon dioxide and aggravates the greenhouse effect,while the trigeneration system with flue gas and waste heat recovery to reduces the emission of pollutants,which is more energy-saving,environmentally friendly and economical,in line with the goal of energy saving and emission reduction and achieving carbon neutrality. |
