An investigation of air-coupled absorbers for an ammonia-water absorption system operating in extreme ambient conditions was conducted. Heat and mass transfer modeling was used to predict the performance of round-tube corrugated-fin absorbers for a 2.64-kW absorption chiller operated at high ambient temperatures. A single-pressure ammonia-water test facility was used in conjunction with a temperature- and humidity-controlled air-handling unit to evaluate the absorbers at design and off-design conditions. Absorber performance was studied over a range of air temperatures and flow rates, inlet solution temperatures, and concentrated solution flow rates and concentrations. At design conditions, round-tube corrugated-fin absorbers of 394 and 551 fins per meter (FPM) demonstrated comparable performance, and measured heat transfer rates were predicted well. Results from this investigation can be used to guide the development of air-coupled heat and mass exchangers for compact absorption heat pumps.

对用于在极端环境条件下运行的氨水吸收系统的空气耦合吸收器进行了研究。传热和传质模型用于预测在高环境温度下运行的2.64 kW吸收式制冷机的圆管波纹翅片吸收器的性能。单压氨水测试设备与温度和湿度受控的空气处理单元一起使用，以评估设计和非设计条件下的吸收器。在空气温度和流速，入口溶液温度以及浓溶液流速和浓度范围内研究了吸收器的性能。在设计条件下，每米394和551翅片（FPM）的圆管波纹翅片吸收器表现出可比的性能，并很好地预测了测得的传热速率。这项研究的结果可用于指导紧凑型吸收式热泵的空气耦合热质交换器的开发。