Experimental And Theoretical Study On Regeneration Of Lithium Chloride Solution In Vacuum

The temperature and humidity independent control air conditioning system is a relatively new type of air conditioning system.In recent years,with the energy crisis and people's demand for a higher living environment,the temperature and humidity independent control air conditioning system is also being popularized rapidly.The temperature and humidity independent control air conditioning system is divided into two parts,one is the cooling part and the two is the dehumidification part.The regeneration of solution in desiccant dehumidification is the focus of this study.The purpose of this study is to study the effect of various factors on the evaporation of lithium chloride solution in vacuum.It provides a theoretical basis for the design of the later stage and regeneration equipment.The main contents of this paper include three parts: the research on solution regeneration at home and abroad is the first part,the simulation calculation of lithium chloride solution in the vacuum state and the calculation of the related properties of lithium chloride solution are second parts.The main physical properties are saturation temperature,surface tension,density,dynamic viscosity,thermal conductivity,specific heat and dilution enthalpy and the experimental setup,data analysis and experimental results are compared with the simulation results in third parts.Experimental conditions: the temperature difference is 10?-16?,the initial concentration of solution is 24%-30%,the pressure is 6kPa-10 kPa and the equivalent thickness is 7mm-16 mm.The evaluation standard is the amount of evaporation,and the time of regeneration is 20 min.It is concluded that the evaporation capacity of lithium chloride solution in vacuum is affected by various factors.Based on the above theoretical analysis and experimental data analysis,the following conclusions can be drawn:(1)When the solution concentration is 30%,the pressure is 3kPa-18 kPa and the temperature difference is 14 degrees,the water evaporation decreases with the increase of equivalent thickness,and decreases rapidly with the increase of pressure.When the pressure range is 14kPa-18 kPa,the evaporation increases first and then decreases with the increase of the equivalent thickness,and the evaporation of water drops slowly with the increase of pressure.The maximum value occurs when the equivalent thickness is 10 mm.In a spherical bottle,when the pressure is 3kPa,the evaporation decreases with the increase of the equivalent thickness,when the pressure range is 6kPa-10 kPa,the evaporation increases first and then decreases with the increase of the equivalent thickness.It increases first and then decreases with the increase of pressure.The maximum value occurs when the pressure is 8 kPa and the equivalent thickness is 10 mm.So under this experimental condition,the maximum value of evaporation will occur when the equivalent thickness is 10 mm or the pressure is 8 kPa.In addition,the conical evaporator is better than the spherical evaporator in the vacuum evaporation regeneration process of Li Cl solution.(2)When the solution concentration is 30%,the pressure is 6kPa-10 k Pa,and the temperature difference is 10-16 C,in conical flask,the evaporation of water increases with the increase of temperature and decreases with the increase of pressure.In the spherical bottle,the evaporation of water increased with the increase of temperature.When the temperature difference was 10,12 and 16,the evaporation of water decreased with the increase of pressure.(3)When the solution concentration is 24%-30%,the pressure is 6kPa-10 kPa,the temperature difference is 14 degrees,in the conical bottle,the evaporation of water rises first and then decreases with the increase of concentration,and the maximum value occurs when the concentration is 28%,and the evaporation of water decreases with the increase of pressure.The evaporation of water in the spherical bottle rises first and then decreases with the increase of concentration,and the maximum value occurs when the concentration is 28.The evaporation of water decreases with the increase of the pressure in the concentration of 24%,26% and 28%.