Dynamic Modeling And Performance Analysis Of PV/T-Heat Pump Driven Liquid Desiccant Air Conditioning Based On TRNSYS

With the continuous advancement of urbanization in China,reducing HAVC(Heating,Ventilation and Air-conditioning)energy consumption has gradually become a significant measure of building energy conservation.Therefore,LDAC(Liquid Desiccant Air Conditioning)has become a research hot-spot in recent years as the reason that it is able to achieve the independent control of temperature and humidity,and it is environmental-friendly and energy efficiency.Researchers proposed a variety of HLDAC(Hybrid Liquid Desiccant Air Conditioning)systems which use low grade energy and renewable energy.On the one hand,there is still room for improvement in energy efficiency of HLDAC system.On the other hand,solar energy fluctuates over time and is greatly affected by weather conditions,it is significant to study the dynamic performance of HLDAC system which driven by solar energy.Therefore,is this paper,an efficient liquid desiccant air conditioning system its dynamic performance is studied.The main research work and contributions of this paper are as follows:(1)Study of PV/T-heat pump driven liquid desiccant air conditioning system.Based on the research and improvement of high efficiency LDAC system,a PV/T-heat pump driven liquid desiccant air conditioning system is proposed.The PV/T technology can make full use of solar radiation which achieve the cascade utilization of solar energy.It generates two kinds of energy simultaneously which named high-grade electric energy and low-grade thermal energy,to power electrical components and liquid desiccant regeneration,respectively.Using heat pump to realize the simultaneous utilization of renewable energy and low-grade energy in LDAC system,which can further improve the system energy utilization efficiency.(2)Dynamic modeling of the system based on TRNSYS.Combined the mathematical models of PV/T collector,heat pump unit,dehumidifier,regenerator and other core components in the system with the function of user-design in TRNSYS,the TRNSYS modules based on above mathematical models of those components are created through setting input/output parameters and compiling the source code.Combining the modules in the TRNSYS component libraries,dynamic simulation platform of PV/T-heat pump driven liquid desiccant air conditioning system based on TRNSYS is also established.(3)System performance analysis of static and dynamic properties.Using the dynamic TRNSYS platform of PV/T-heat pump driven liquid desiccant air conditioning system and control variable method,the influence of setting parameters and operating parameters of each subsystem on system performance is analyzed through static simulation,the dynamic performance of the system over time under different operating parameters and weather conditions is studied by dynamic simulation.The simulation results can be used to further study the control strategy and energy efficiency optimization of the system.