The Researching And Analysising About Coupling Of Lithium Bromide Solution Thermal Parameters And Refrigeration Characteristics In Absorption Cycle

Lithium bromide absorption refrigeration cycle system is composed of the condenser,evaporator, absorber, generator and heat exchangers and other components. This paperdescribes in detail the lithium bromide absorption refrigeration cycle systems with boosterthat was designed and reconstructed independently, the control system of cooling tower fanvariable frequency and the design mixing tank for a constant temperature of coolant water andreducing the cooling tower fan power consumption. The application of test measurementcycle in the thermal parameters of the test equipment is introduced and the accuracy of theinstruments and the error of the cycle system is analyzed to ensure more accurate and reliabletest data and to be more stable, convenient and simple the control unit.Based on the thermal physical properties of lithium bromide solution, the lithiumbromide solution and gas-liquid equilibrium relationship and the relationship between P and T,calculate the physical parameters of lithium bromide solution value in different conditions andput the calculated value into the model of lithium bromide chiller by writing a computerprogram. The mathematical model of condenser, evaporator, absorber, generator, high and lowtemperature heat exchanger and booster in the double-effect lithium bromide refrigeration unitwith booster are established by simulink software and every modules are linked as a wholeunit module in some ways, and then entered the physical parameters and certain assumptionsinto the unit module to make the entire crew module simulation. Compared the simulationresults with test results, it is found that cooling capacity error of2.3%to8.0%, Condensingheat load error of1.5%to8.3%, COP of error of6.3%to18.8%, and the simulation results ofthe unit operation basicly meets the actual forecast.By adjusting the inside and outside thermal parameters of the lithium bromide absorptioncycle unit and coupled between the various parameters, analyze its influence on thecharacteristics of refrigeration unit. By analyzing the experimental data, the generatortemperature was also reduced, although cooling properties is decreased as reduction of theconcentration of the solution filling indirectly reduced the heat-driven heat source temperature,achieved full utilization of low temperature waste heat. Increasing the absorption of thepressure inside the absorber, could increase capacity and improve the refrigeration cyclesystem cooling capacity. Coupled between the various parameters and analyzed test results,appropriately increased evaporation temperature and decreased the concentration of thesolution filling, reduced the cooling water inlet temperature and the concentration of thesolution filling, increased the absorption pressure and reduce the concentration of the solution filling to ensure the cooling capacity to achieve that little change in the purpose of reducingdriving heat source temperature and increased the absorption pressure and the evaporationtemperature can significantly improve the cooling characteristics of the unit, minimize theunit size.