Enhancement Of The Parallel And Series Mode Of The Ultrasonic Atomizer On The Ammonia-Water Falling Film Absorber

Abstract

Falling film absorber is widely used in the ammonia-water absorption refrigeration system, and the mass transfer area can be enlarged by the atomization device to overcome the shortages of low system energy efficiency and large system size. Ultrasonic atomizer can produced micron size droplets, so the liquid-vapor contact area can be further enlarged. Considering the large flight resistance of the small size droplets, the ultrasonic atomizer devices are located at the top of the absorber, and two installation strategies (i.e., parallel and series) are proposed. To analyze the improvement of the novel absorber with the installation of the atomizer, a mathematical model to describe the mass and heat transfer of the novel absorber is established. The model is verified by the reported data of literature, and the enhancement effects of the parallel and series installation strategies of the atomizer are discussed by the validated model. In the condition of this paper, compared with traditional falling film absorber, the ammonia absorbed rate is increased by 22.5% for the parallel installation strategy and 17% for the series installation strategy. Compared with the improvement of the cooling capacity, the energy consumption of the atomizer is worth.