Thermodynamic analysis of a cascade refrigeration system

A noble integration of a cascade refrigeration system with a two-stage compression chiller is proposed. The compression and the absorption systems have a cascade inter-cooler/evaporator and the compression system has two compressors working in series. This system runs by a driving unit which can be a micro-turbine or a solid oxide fuel cell. The system components are modeled and analyzed through the energy and exergy approaches. The performance parameters of the systems and the second law efficiency are calculated in different operating conditions. The results show that the maximum irreversibilities happen in the generator and the first stage compressor, and the total destruction is higher when a micro-gas turbine is used as the prime mover. It appears that energy and exergy are consumed up to 260% and 188% more efficiently in the proposed system compared to a traditional single-stage compression refrigeration system.

کلیدواژه ها:

cascade refrigeration ، two-stage compression ، exergy analysis ، energy utilization factor