吸收式风冷冷风机组流程模拟和影响因素分析

Process Simulation and Influencing Factor Analysis of Absorption Air-cooled Chiller

阐述吸收式风冷冷风机组的制冷原理(溴化锂溶液吸收式制冷循环)。通过对一台制冷量为4.5 kW的住宅用吸收式风冷冷风机组应用Aspen Plus 8.0软件搭建模型并进行模拟,验证模型的正确性。研究在蒸发温度为7℃,冷凝温度为38℃工况下,分析稀溶液质量流量变化、发生温度变化对机组性能的影响。流程模拟结果表明,稀溶液质量流量由50 kg/h升高至300 kg/h时,发生温度由103.23℃降至80.70℃,蒸发器负荷由4.341 kW均匀升高至6.890 kW,机组性能系数由0.81均匀下降至0.59。稀溶液质量流量在100~150 kg/h范围内,机组综合性能较高。保持蒸发温度为7℃,冷凝温度为38℃不变,机组各设备热负荷随发生温度的升高相应提高。将发生温度设为90℃左右,机组的性能最优。

The refrigeration principle of an absorption air-cooled chiller （lithium bromide absorption refrigeration cycle ） is explained. A model for a residential absorption air-cooled chiller with a refrigerating capacity of 4.5 kW is built by Aspen Plus 8.0 software, and the simulation is conduct to verify the correctness of the model. The influence of the change of the mass flow rate of dilute solution and the change of generator temperature on the performance of the unit is analyzed under the conditions of an evaporation temperature of 7℃ and a condensing temperature of 38℃.The process simulation results show that when the mass flow of dilute solution increases from 50 kg/h to 300 kg/h, the generator temperature decreases from 103. 23℃ to 80.70℃, the evaporator load increases uniformly from 4. 341 kW to 6. 890 kW, and the unit performance coefficient decreases uniformly from 0.81 to 0.59. The mass flow of dilute solution is in the range of 100 kg/b to 150 kg/h, the comprehensive performance of the unit is relatively high. Keeping the evaporation temperature at 7℃ and the condensing temperature at 38℃, the heat load of each equipment of the unit increases with the increase of generator temperature. The performance of the unit is optimal when the generator temperature is set at about 90 ℃.