کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
645225 | 1457141 | 2015 | 13 صفحه PDF | دانلود رایگان |
• A compression-absorption double-stage (CADS) system is by the first time proposed.
• The compression power in cascade cycles was 45% lower than in compression cycles.
• The COP for proposed system was up to 45.2% higher than those with other systems.
• The systems operating with R134a achieved higher COP than those obtained using CO2.
• The irreversibilities for the CADS using R134a were 17% lower than using CO2.
This study reports a comparison from the first and second law of thermodynamics of a conventional vapor compression cooling system, a compression-absorption single-stage (CASS) system, and a compression-absorption double-stage (CADS) system operating with CO2 and R134a in the compression cycle and H2O/LiBr in the absorption cycles. The CADS system is being by the first time proposed in the literature. The performance of the systems were analyzed as function of diverse operating parameters. It was found that the electrical energy consumption in the refrigeration cycles was about 45% lower than in the classical compression refrigeration cycles using CO2 and R134a as refrigerants under the same operating conditions. The results showed that the COP for the CADS could be 50% higher than those obtained with the CASS system. The systems operating with R134a always achieved higher COP than those obtained using CO2. From the exergy analysis it was clear that the highest irreversibilities occurs in the absorber and the evaporator for both mixtures. It was also found that the irreversibilities of the proposed system using R134a in the compression cycle were 17% lower than those obtained with the system using CO2
Journal: Applied Thermal Engineering - Volume 87, 5 August 2015, Pages 273–285