| This study is based on the project of the “Heating and air conditioning program and corresponding system of building in Yangtze River Region”(project number: 2016YFC0700306).Air condition energy consumption accounts for more than 50% of the total building energy consumption,therefor designing a reasonable air-conditioning system and high-efficiency operating to reduce the energy consumption of air conditioning systems has been an aim in the HVAC field.In recent years,the advantages of liquid desiccant air conditioning systems have gradually been discovered.There are more and more related researches,and actual engineering projects are also emerging.However,the actual engineering applications are still at an exploratory stage.This paper mainly studies the application of the liquid desiccant air conditioning system in humid area,based on the characteristics of the building cooling and humidity load and the cooling and dehumidification treatment performance of the equipment,which has important guiding significance for its promotion and application in humid area.The paper is mainly divided into four parts: researches on building cooling and humidity load,researches on the cooling and dehumidification treatment performance of the equipment,operation scheme of liquid desiccant air conditioning system applying in humid area,and researches on the energy saving potential of the system applying in humid area.Firstly,this paper analyzes the cooling and humidity load characteristics in summer of public buildings in the humid area.The cooling and humidity load of business buildings,hotel buildings and commercial buildings in Guangzhou,Chongqing,and Fuzhou are simulated using the DeST software.The latent heat load accounts for 80% of the outdoor air load,thus the energy consumption of treatment the outdoor air is mainly used to eliminate the latent heat load.At the second,mathematical model was built to study the dehumidification unit and the heat pump liquid desiccant outdoor air handling unit.The result shows that,the inlet air temperature has little influence on the cooling and humidify treatment performance;high inlet air humidity ratio is beneficial to cooling and dehumidifying;the higher solution inlet moisture content is,the higher cooling and humidify treatment performance will be;the positive effect of liquid to gas ratio on the performance is gradually decrease.Results also shows that the more unit dehumidification capacity of the equipment,the more external cooling and heat sources are required,and the lower the equipment performance is.In order to further know the performance,the author an actual engineering tests was made for an operating heat pump liquid desiccant air condition.And then,the paper theoretically calculates the load distribution of the temperature control system and the humidity control system,and proposes a corresponding operation plan in combination with the seasonal variation of cooling and humidity load in humid areas.When the indoor sensible cooling load is large,it is better to lowing the temperature of supplying air and using the cold water of high temperature chiller to cool the outdoor air in advance.When the indoor sensible cooling load is low,the air handling unit should remove all thermal load.At last,this paper compares and analyzes the energy-saving potential of liquid desiccant air condition system in different types of public buildings in humid areas,and analyzes the differences of the energy-saving potential under different climatic conditions.The result shows that the liquid desiccant air condition system can save energy about 35% compared with traditional air source heat pump systems in business buildings in humid areas;improving the performance of high temperature chillers is the key to improving the overall system performance;the more stable the regional sensible heat load in summer is,the greater the potential for energy saving will be;the lower the outdoor temperature is,the better the performance of the air handling unit will be. |
PDF Full Text Request