Study And Simulation Of A Small Solar Absorption Air Conditioning System And Its Absorber

Studies and simulation is done on a small solar-powered adiabatic absorption refrigeration cycle. Based on the theory of the separation and respective aggrandizement on the heat and mass transfer, uses an absorber of adiabatic absorption with packing inside and circular cooling in the cycle. Evaporative exchangers are applied in the system as the condenser, evaporator and the radiator of the absorber. Because of the low pressure in the generator, a roots vacuum pump is used as a compressor between the generator and condenser. The system is powered by the hot water of 80℃. Results of the simulation have showed this novel absorption refrigeration cycle brings an improvement in the system performance.As the absorber is one of the most important components, how to improve the efficiency and reduce the volume of the absorber is also one of the difficulties of small solar-powered absorption refrigeration system, simulates and analyses the process of the absorption in Aspen Plus with a non-equilibrium stage model of RateFrac. This simulation adopts a method of ELECNRTL in simulating the process of LiBr electrolytical aqueous solution absorbs water vapor. With the results of the simulation on the packing with different sizes and types, a parameter optimization of the absorber could be done.Simulates the system process with Aspen Plus based on the simulation of absorption, and compares the results obtained from the simulation and thermodynamic calculation program. It further shows this solar-powered refrigeration cycle has a better performance. By the comparison between the thermodynamic parameters of LiBr solution obtained respectively from the electrolytical property method in Aspen Plus and the enthalpy- concentration map of LiBr saturated solution, analyses the source of deviation in the simulation, and proposes measures to further improvement.