SUMMARYA thermodynamic analysis has been carried out on a compression-absorption system that can be used for simultaneous heating and cooling applications. Refrigerant and absorbent pair of R-22 and DMETEG has been considered. The results are obtained for a system that can be used in dairy plants for pasteurization and chilling of milk for subsequent storage. Results show that by operating the system at marginally higher discharge pressures (about 30 bar) than normal (about 25 bar) one can achieve excellent performance despite the required large temperature lift. A comparison with a single stage vapour compression system shows that, the compression-absorption system yields much better overall performance especially when the temperature lifts are high.
SUMMARYAn experimental study has been carried out on a single-stage compression-absorption system for simultaneous heating and cooling with R22 and E181 (DMETEG) as the working fluid pair. An absorber, being the major component of the system, is designed to absorb the amount of vapour that can be handled by the selected refrigerant compressor. The designs of the other components of the system are based on the design result of the absorber. The experimental test results have been compared with the results obtained from the theoretical analysis of the system. Though the experimental results are found to match the theoretical results qualitatively, the performance of the experimental test rig is found to be lower than that of the theoretical predictions due to various heat losses from the system and non-ideal compression.
SUMMARYAn exergy analysis of a single-stage compression-absorption system with R22-E181 as the working fluid pair is carried out. Theoretical results obtained have been compared with those obtained from the experiment. Results show that the heat of mixing of the refrigerant vapour and solution at absorber and desorber contributes a significant amount to the internal entropy generation rates. A significant part of internal entropy generation rate is also due to non-isentropic compression of refrigerant vapour at higher absorber pressure. The exergetic efficiency of the system increases with the increase in absorber pressure due to reduction in internal irreversibilities. Higher value of weak solution concentration along with the increase in solution concentration difference results in higher exergetic efficiency of the system. Thus, a compression-absorption system performs better when operated at higher absorber pressure, and an improved system performance can also be achieved with higher value of weak solution concentration with higher possible solution concentration difference.
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