Simulation And Analysis Of Energy Consumption Of Central Air Conditioning System In Passive Buildings

The research building of a university in Shandong is designed according to passive building requirements.The central air-conditioning system uses a ground source heat pump system for the cold and heat source,and the end unit uses a fan coil and an independent fresh air control system.The indoor sensible heat and cold load is undertaken by the high-temperature ground source heat pump unit,and the indoor latent heat and cold load and the wet load are borne by the new wind turbine unit.Taking the building as an example,this paper combines the actual measurement and the software simulation to simulate the cooling energy consumption of the central air-conditioning system of the building,and gives the system energy consumption change law under different working conditions.In this paper,DeST software is used to establish the energy consumption analysis model of the passive building project.The distribution of the building’s annual hourly cold,heat load and building sub-load is obtained.The typical day and the whole supply are given.In the cold season total cooling load,the proportion of sensible heat cooling load and latent heat cooling load is obtained by simulating the whole cooling season.The summer sensible heat load accounted for 25%~45%,which is the temperature and humidity independent control air conditioning system.The design provides the basis.Secondly,through the wetting diagram,the energy consumption composition and determination method of the conventional air conditioning system and the temperature and humidity independent control air conditioning system are analyzed,and the energy saving operation scheme of the temperature and humidity independent control air conditioning system is determined,that is,the high temperature ground source heat pump unit bears the indoor sensible heat load.The new wind turbine unit is responsible for indoor wet load and fresh air load.Finally,the performance of the heat pump unit was simulated by using the heat pump unit simulation software,and the performance curve of the heat pump unit under different working conditions was obtained.The simulation calculation of the energy consumption of the airconditioning system with independent control of temperature and humidity is carried out,and the economic conditions of the cold load undertaken by the high-temperature cold source are 25%~45%.Under the conditions of constant flow and constant temperature,the hightemperature ground source heat pump unit is simulated.The law of energy consumption changes,and then analyzes the energy consumption of the air conditioning system independently controlled by conventional air conditioning system and temperature and humidity,and gives the analysis results;provides reference for the design of temperature and humidity independent control central air conditioning system.