Study On A New Absorption Refrigeration Cycle Used In Low Temperatures

A new auto-cascade absorption refrigeration cycle was proposed in this thesis to get low temperatures by utilizing low thermal potential energy based on an Overall reviews of innovations in absorption cycles during the past decade. In addition, a systematic research on this new cycle was carried out both theoretically and experimentally with different refrigerants/DMF (absorbent) as working fluids.The characteristics of this new cycle at different working conditions were calculated and analyzed carefully based on mass, heat, and phase equilibrium. Besides, the characteristics of a traditional single-effect absorption refrigeration cycle under the same condition are also calculated for comparison. The results show that this new cycle may achieve temperatures much lower than those obtained by traditional absorption ones. It has been approved that whether the heat capacities of the two streams in the condenser-evaporator match or not has a key effect on COP.In order to investigate the performance of this new cycle, a set of experimental apparatus was designed and setup, a series of experiments using R134a/DMF, R13+R134a/DMF, R32+R134a/DMF, and R13+R134a+R32/DMF as working fluids respectively were also carried out in this thesis, hi these experiments, this new cycle shows not only its ability to get low refrigerating temperatures but its potential in utilizing low thermal potential energy as driving power.The theoretical and experimental studies on this auto-cascade absorption refrigeration cycle, as a first try, were summarized to provide some suggestions in improving its performance, which are pretty useful for future studies.