Performance Study And Optimization Of Air Source Heat Pump Space Heating And Cooling System With Different Terminals

In this paper,the variable inlet water temperature(IWT)control strategy is proposed.Compared with the traditional fixed IWT 7 in summer and 40 in winter,the IWT varies with outdoor air temperature,as field test and simulation result shows,this system has turned out to be a energy saving system.In the traditional central air-conditioning system,the embedded fan coil is widely used.The small temperature difference terminal which has better heat transfer capacity is adopted to improve the efficiency of the heat pump and the indoor load demand is satisfied at the same time.In addition,the location of it has been changed from ceiling to the floor,which will lead to the better indoor air distribution.Due to poor outdoor air quality in recent years,it is necessary to equip airconditioning system with ventilator.It can decrease CO2 density and improve indoor air distribution,especially in winter.What's more,it can filter about 2/3 of small particles less than 2.5 ?m and the majority of small particles less than 10 ?m.