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Journals / Journal of Thermal Engineering / 2021 / Cilt: 7 - Sayı: 4

Energy and exergy analysis of a combined system: cascade organic Rankine cycle and cascade refrigeration cycle

Touaibi RABAH
Hasan KOTEN
Boudjema FADHILA
Selmane SALMA
Hemis MOHAMED
Pages
1139–1149
Publication Date
2022-10-18
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The results show that the combined system function with the couple (R717/R23) for cascade refrigeration cycle gives better exergy efficiency 50.03% compared to other couples, 49.57% for the couple (R717/R744), and 48.01% for the couple (R134a/R23).

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this paper, a new combined system is proposed for recovering thermal energy at medium temperature using a cascade organic Rankine cycle to feed a cascade refrigeration cycle.
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Key Findings & Data:Energy and exergy analysis is applied to the combined system to determine its performance using different working fluids under the same operating conditions taking into account the effect of some operating parameters and the selection of organic fluids on cycle performance.
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Conclusion & Impact:The results show that the combined system function with the couple (R717/R23) for cascade refrigeration cycle gives better exergy efficiency 50.03% compared to other couples, 49.57% for the couple (R717/R744), and 48.01% for the couple (R134a/R23).
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Organic rankine cycle · Cascade refrigeration · Exergy analysis

Abstract

In this paper, a new combined system is proposed for recovering thermal energy at medium temperature using a cascade organic Rankine cycle to feed a cascade refrigeration cycle. Energy and exergy analysis is applied to the combined system to determine its performance using different working fluids under the same operating conditions taking into account the effect of some operating parameters and the selection of organic fluids on cycle performance. The pair of organic fluid (Toluene/R245fa) used for the cascade organic Rankine cycle and the pairs (R717/R744, R717/R23, R134a/R23) used for the cascade refrigeration cycles. The results show that the combined system function with the couple (R717/R23) for cascade refrigeration cycle gives better exergy efficiency 50.03% compared to other couples, 49.57% for the couple (R717/R744), and 48.01% for the couple (R134a/R23). The thermodynamic evaluation shows that the operating temperatures, such as the cascade organic Rankine cycle evaporation temperature and the cascade refrigeration cycle evaporation temperature influence the performance of the combined system.

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Cite This Article

RABAH, T., KOTEN, H., FADHILA, B., SALMA, S., MOHAMED, H. (2022). Energy and exergy analysis of a combined system: cascade organic Rankine cycle and cascade refrigeration cycle. Journal of Thermal Engineering, Cilt: 7 - Sayı: 4, 1139–1149. https://ajindex.com/articles/566566

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