Absorption refrigerators can be driven by waste heat. Inparticular, the double- effect type of absorption refrigerator, whichis highly efficient, is drawing a great deal of attention as a wasteheat recovery system. This research examines the double-effectabsorption refrigerator driven by steam, assuming waste heat from thefuel cells is applied. In the start-up of the double-effectabsorption refrigerator, the solution temperature is almost equal tothe temperature of the air. Due to the large temperature differencebetween the solution and the heat sources, the solution isoverheated. In the worst case, it will be crystallized. Additionally,some solution is circulated due to the existence of a pressuredifference between the heat exchangers. If the solution pump isstarted before an adequate pressure difference is obtained, theabsorption refrigerator cannot be started normally. To investigatethese problems, a simulation model is constructed. An experiment isconducted to investigate the performance of this model. As a result,the validity of this model is confirmed and the detailed start-upcharac- teristics are clarified.
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