Compressor-assisted Triple-effect H₂O/LiBr Absorption Cooling Cycles

In recent years, with the depravation of environment problems, LiBr absorption refrigeration units attracts more and more people's attention for its many merits such as electricity-saving, little environment pollution etc. The electric-compressor refrigeration units do better than double-effect LiBr absorption refrigeration units in the aspect of general energy using. In order to compete with the existing electric-compressor refrigeration units in wider space, developing triple-effect absorption refrigeration units is a general tendency.Now,the key difficulty that obstacle the development of the triple-effect absorption units is how to prevent the high temperature generator from eroding condition of GH temperature. With focus on the problem, this thesis makes a deeper research on the base of former contributions, which include three parts: 1,To programme the properties of lithium bromide-water scope at high temperatures; 2,To establish four compressor-assisted triple-effect absorption cycles and make a computer simulation; 3,To give the cycle a feasible analysis, make an exergy analysis from the aspect of energy using and provide energy saving advices.Simulation results indicate that the COP of general triple-effect absorption units can reach 1.59, which is about 30% higher than that of the double-effect units which is about 1.2. Compressor-assisted triple-effect absorption units can guarantee lower the GH temperature from 217.6℃to under190℃with a little decline of COP which is about 4.4%. The temperature decrement is distinct which extensively reduce the eroding problem. The tendency of temperature decrement becomes mores obvious as the compression ratio increases. The exergy analysis data shows that at the same temperature decrement, cycleⅠhas the highest energy loss while cycleⅢthe lowest.