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Thermodynamic modelling and parametric study of a low temperature vapour compression-absorption system based on modified Gouy-Stodola equation

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  • Jain, Vaibhav
  • Sachdeva, Gulshan
  • Kachhwaha, S.S.

Abstract

Present paper thermodynamically analyses a VCAS (vapour compression-absorption system) with carbon dioxide (compression section) and ammonia-water (absorption section) as refrigerants and determines the optimal condensing temperature of cascade condenser using modified Gouy-Stodola equation. The optimum cascade condenser temperature is found to be −13 °C for 175 kW refrigeration capacity at an evaporator temperature of −45 °C and condenser temperature of 35 °C. The optimum cascade condenser temperature maximises the overall COP, rational efficiency and minimises the total irreversibility rate of the VCAS system. The value of optimum condensing temperature and its corresponding maximum COP, and minimum irreversibility rate are discussed for a wide range of operating conditions. Further, a comparative study of TSVCS (two stage vapour compression system) used for low temperature refrigeration applications with VCAS shows that at design point, primary energy consumption is reduced by 60.6% and electrical COP is improved by 153.6% in VCAS as compared to conventional TSVCS. But the total irreversibility rate of VCAS is 38.4% higher than the TSVCS due to the use of low grade energy in vapour absorption system and hence the rational efficiency of VCAS is 14% low.

Suggested Citation

  • Jain, Vaibhav & Sachdeva, Gulshan & Kachhwaha, S.S., 2015. "Thermodynamic modelling and parametric study of a low temperature vapour compression-absorption system based on modified Gouy-Stodola equation," Energy, Elsevier, vol. 79(C), pages 407-418.
    • Handle: RePEc:eee:energy:v:79:y:2015:i:c:p:407-418
    DOI: 10.1016/j.energy.2014.11.027
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    References listed on IDEAS

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    Cited by:

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    2. Sun, Xiaojing & Zhuang, Yu & Liu, Linlin & Dong, Yachao & Zhang, Lei & Du, Jian, 2022. "Multi-objective optimization of heat exchange network and thermodynamic cycles integrated system for cooling and power cogeneration," Applied Energy, Elsevier, vol. 321(C).
    3. Sun, Dahan & Wang, Cong & Liu, Zekuan & Qin, Jiang & Liu, Zhongyan, 2024. "Experimental and simulation study on a new gradient waste heat recovery system with a wider application range," Energy, Elsevier, vol. 301(C).
    4. Muhsin Kılıç, 2022. "Evaluation of Combined Thermal–Mechanical Compression Systems: A Review for Energy Efficient Sustainable Cooling," Sustainability, MDPI, vol. 14(21), pages 1-38, October.
    5. Jain, Vaibhav & Sachdeva, Gulshan & Kachhwaha, Surendra Singh, 2015. "Energy, exergy, economic and environmental (4E) analyses based comparative performance study and optimization of vapor compression-absorption integrated refrigeration system," Energy, Elsevier, vol. 91(C), pages 816-832.
    6. Gado, Mohamed G. & Ookawara, Shinichi & Nada, Sameh & El-Sharkawy, Ibrahim I., 2021. "Hybrid sorption-vapor compression cooling systems: A comprehensive overview," Renewable and Sustainable Energy Reviews, Elsevier, vol. 143(C).

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