Experimental Investigation On Heat And Mass Transfer In Falling Film Heat Pipe-Type Absorber

As an energy shortage and the slow development of renewable energy, improving the energy efficiency has become an important method to facilitate the energy crisis. Heat pump is an energy recovery system, it has been widely used in many field for its economy, reliability and environmental friendliness.The AHT system is a heat-driven energy saving system. It consumes only a little electrical energy, which can transfer the low temperature heat that can not be recycled to a high temperature, this will greatly save the energy consumption in production process. The AHT system has a good prospect in the field of waste heat recovery. As a key device, the heat and mass transfer efficiency of the absorber directly affect the performance of the AHT system.. In this paper, a heat-pipe type falling film absorber has been designed, based on falling film absorption and heat pipe exchanger, and an AHT system is proposed. The main works are as follows:(1) Process calculation of the whole AHT system and design of the heat-pipe type absorber;(2) Putting up the AHT experiment platform, checking and debugging the system;(3) A contrast heat and mass transfer experimental research of falling film absorption has been studied between smooth heat pipe and grooved heat pipe.Experimental results show that the heat pipe type absorber has a good performance in Lithium Bromide falling film absorption process, the spray density and absorbent pressure are the main factors affecting the heat and mass transfer. the membrane heat transfer coefficient of grooved tube has increased by 2-3 times as that of the smooth tube, also the mass transfer coefficient has doubled.