Research On The Matching Relationship And Scheme Comparison Of Solar Powered Desiccant Air Conditioning System

Solar energy is a kind of clean,non-polluting and sustainable energy.The solar radiation intensity has a positive synchronous relationship with the change of air conditioning cooling load.Its access is not limited by factors,such as traffic.Making a good use of solar energy is one of the effective ways to solve the energy shortage problem in some areas,for example,islands far away from the mainland.Liquid desiccant dehumidification air conditioning system has many advantages.It can control indoor temperature and humidity independently,with the functions of disinfection and sterilization of air.Accordingly,it will not cause environmental pollution,with merits of energy saving and high efficiency meanwhile.In addition,liquid desiccant air conditioning can also make full use of low-grade waste heat and waste heat to achieve solution regeneration and strong energy compatibility.Solar liquid desiccant air conditioning system combines solar energy and liquid desiccant technology closely.The system has both the advantages of the two.This system can achieve energy selfsufficiency,without relying on the grid,fuel,gas and other traditional energy forms.This paper presents two solutions for dehumidification air conditioning systems,direct and heat pump.The mathematical model of the main components of the system is established by using 1000 kW building cooling load as module.In the different building cooling load index,the amount of fresh air per unit area,building heat and humidity ratio conditions,the main components are matched for further calculation.The main components include solution dehumidification units,indoor air conditioning end,high temperature chillers,solar collectors and photovoltaic power generation devices.The optimal combination of each part is calculated.The results show that the size of the dehumidifier is determined by the fresh air volume,and the building heat.Moreover,humidity ratio has a greater influence on the equipment capacity of the end of the indoor air conditioner,the high temperature chiller,the solar collector and the PV power plant.The greater the fresh air volume,the greater the size of the solution dehumidification unit.The greater the heat and humidity ratio,the smaller the indoor air conditioning end,the high temperature chiller,the solar collector and the photovoltaic power plant.The economy of the solution dehumidification air conditioning system and the area of the solar energy conversion device used in the two systems were analyzed and compared.The results show that the initial investment of the solar energy direct solution dehumidification air conditioning system is obviously lower than that of the heat pump type dehumidification air conditioning system.While the area of the solar energy conversion device is much higher than that of the former.Therefore,solar direct solution dehumidification air conditioning system should be preferred used if there is no restrictions on the area.Energy self-contained solar-driven solution dehumidification air conditioning system provides a new choice for the construction of air conditioning system design,especially in remote islands and other areas short of conventional energy.This study can be used as a theoretical reference for the design of such building air conditioning systems.