Design And Simulation Of Solar Liquid Desiccant Radiation Air-conditioning System In Hot Summer And Cold Winter Area

The current widespread used air-conditioning system is usually combined treatment of heat and moisture,determined the air supply volume according to the load of the room and the air enthalpy difference of air supply,using convection way to eliminate the indoor waste heat and wet.In this air-conditioning system,there is a great sense of hair and obvious noise,what's more,the use of return air and the condensed water plate often causes a decline in air quality even trigger "air conditioning disease.Therefore,the traditional air-conditioning system can't meet the increasing demand of the indoor environment comfort requirements.This paper presents a solar liquid desiccant radiation air-conditioning system for hot-summer and cold-winter zone.This air conditioning system based on the operating principle of independent control indoor temperatre and humidity,the indoor load is divided into two parts as cold(hot)and humidity,and use two separate air-conditioning subsystem respectively control them.The indoor cooling load is adjusted by the capillary radiant air conditioning system,while the indoor humidity is regulated by the solar liquid desiccant ventilation system,which can realize the independent control of indoor temperature and humidity.Air source heat pump is used air as the cooling heat source for the cooling medium cycle;it can transfer energy by a small amount of electric energy and it can be used in both heating and cooling,quite convenient and efficient.The capillary net with its large heat exchange area can effectively reduce the temperature difference when heating and cooling,so it can effectively improve the evaporation and condensation temperature of heat pump units,and improve the operating efficiency of the system.The solution regeneration heat came from solar energy,which is clean and environmental protection.What's more,this system can also used in winter heating and other season for venation,has high system utilization.This paper analyzed the system's stability during whole summer by using TRNSYS software.In addition,this paper comparative analyzed the indoor thermal comfort of simulation rooms respectively with solar liquid desiccant radiation air-conditioning system and the traditional central air conditioning system in the summer,including indoor temperature,relative humidity and air velocity in the different profile distribution.Through the above analysis,we can draw the following conclusions:in the whole summer air conditioning period,the solar liquid desiccant ventilation system is stable and can meet the requirements of different indoor and outdoor parameters;indoor thermal conform of the room with solar liquid desiccant radiation air-conditioning system is significantly better than the room with traditional central air conditioning system,mainly reflected in its indoor temperature distribution is more uniform,indoor relative humidity is all in the comfort range and indoor wind speed is low.This paper combined liquid desiccant ventilation system with radiation air conditioning system,and proposed a new type of temperature and humidity independent control air conditioning system.In this system,solar energy and heat pump technology are introduced in respond to the national "energy saving and emission reduction" policy,closely following the industry trend for low-energy buildings,and provide a useful reference for exploring comfortable and energy-saving air conditioning system in the area of hot-summer and cold-winter zone.