NON-ABSORBABLE GAS CONTROL IN THE ABSORBER/EVAPORATOR IN AN ABSORPTION CHILLER USING AN IMMERSED PLATE

摘要

Two-dimensional numerical computations on vapor flow in the absorber/evaporator in an absorption chiller have been performed in order to investigate how to control the non-absorbable gas behavior. An immersed plate was inserted from the top wall in the absorber/evaporator and its horizontal position was changed in three steps while its length is kept constant. The mean concentration of non-absorbable gas ranged from 0 to 10vol%. An immersed plate insertion is found to cause a flow recirculating region forms behind it. In such a recirculating region, non-absorbable gas is concentrated. Then, when the immersed plate is located away from the absorber, non-absorbable gas does not penetrate into the absorber and the overall heat transfer is kept high even at the mean non-absorbable gas concentration of 10vol%. It is concluded the insertion of an immersed plate can control the non-absorbable gas behavior and there exists an optimum position of an immersed plate for keeping the absorption ability of the absorber high.