Exergoeconomic Analysis of a Mechanical Compression Refrigeration Unit Run by an ORC
To improve the efficiency of a diesel internal combustion engine (ICE), the waste heat carried out by the combustion gases can be recovered with an organic Rankine cycle (ORC) that further drives a vapor compression refrigeration cycle (VCRC). This work offers an exergoeconomic optimization methodol...
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| Format: | Article |
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MDPI AG
2023-11-01
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| Series: | Entropy |
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| Online Access: | https://www.mdpi.com/1099-4300/25/11/1531 |
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| author | Daniel Taban Valentin Apostol Lavinia Grosu Mugur C. Balan Horatiu Pop Catalina Dobre Alexandru Dobrovicescu |
| author_facet | Daniel Taban Valentin Apostol Lavinia Grosu Mugur C. Balan Horatiu Pop Catalina Dobre Alexandru Dobrovicescu |
| author_sort | Daniel Taban |
| collection | DOAJ |
| description | To improve the efficiency of a diesel internal combustion engine (ICE), the waste heat carried out by the combustion gases can be recovered with an organic Rankine cycle (ORC) that further drives a vapor compression refrigeration cycle (VCRC). This work offers an exergoeconomic optimization methodology of the VCRC-ORC group. The exergetic analysis highlights the changes that can be made to the system structure to reduce the exergy destruction associated with internal irreversibilities. Thus, the preheating of the ORC fluid with the help of an internal heat exchanger leads to a decrease in the share of exergy destruction in the ORC boiler by 4.19% and, finally, to an increase in the global exergetic yield by 2.03% and, implicitly, in the COP of the ORC-VCRC installation. Exergoeconomic correlations are built for each individual piece of equipment. The mathematical model for calculating the monetary costs for each flow of substance and energy in the system is presented. Following the evolution of the exergoeconomic performance parameters, the optimization strategy is developed to reduce the exergy consumption in the system by choosing larger or higher-performance equipment. When reducing the temperature differences in the system heat exchangers (ORC boiler, condenser, and VCRC evaporator), the unitary cost of the refrigeration drops by 44%. The increase in the isentropic efficiency of the ORC expander and VCRC compressor further reduces the unitary cost of refrigeration by another 15%. Following the optimization procedure, the cost of the cooling unit drops by half. The cost of diesel fuel has a major influence on the unit cost of cooling. A doubling of the cost of diesel fuel leads to an 80% increase in the cost of the cold unit. The original merit of the work is to present a detailed and comprehensive model of optimization based on exergoeconomic principles that can serve as an example for any thermal system optimization. |
| first_indexed | 2024-03-09T16:50:57Z |
| format | Article |
| id | doaj.art-7dbd7ffee62f459ea808f0ccdf2a8437 |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-09T16:50:57Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-7dbd7ffee62f459ea808f0ccdf2a84372023-11-24T14:41:02ZengMDPI AGEntropy1099-43002023-11-012511153110.3390/e25111531Exergoeconomic Analysis of a Mechanical Compression Refrigeration Unit Run by an ORCDaniel Taban0Valentin Apostol1Lavinia Grosu2Mugur C. Balan3Horatiu Pop4Catalina Dobre5Alexandru Dobrovicescu6Department of Engineering Thermodynamics, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, RomaniaDepartment of Engineering Thermodynamics, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, RomaniaLab Energet Mech & Electromagnetism (LEME), University of Paris Nanterre, 50 Rue Sevres, F-92410 Ville d’Avray, FranceDepartment of Thermodynamics, Technical University of Cluj-Napoca, 400114 Cluj-Napoca, RomaniaDepartment of Engineering Thermodynamics, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, RomaniaDepartment of Engineering Thermodynamics, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, RomaniaDepartment of Engineering Thermodynamics, National University of Science and Technology Politehnica Bucharest, 060042 Bucharest, RomaniaTo improve the efficiency of a diesel internal combustion engine (ICE), the waste heat carried out by the combustion gases can be recovered with an organic Rankine cycle (ORC) that further drives a vapor compression refrigeration cycle (VCRC). This work offers an exergoeconomic optimization methodology of the VCRC-ORC group. The exergetic analysis highlights the changes that can be made to the system structure to reduce the exergy destruction associated with internal irreversibilities. Thus, the preheating of the ORC fluid with the help of an internal heat exchanger leads to a decrease in the share of exergy destruction in the ORC boiler by 4.19% and, finally, to an increase in the global exergetic yield by 2.03% and, implicitly, in the COP of the ORC-VCRC installation. Exergoeconomic correlations are built for each individual piece of equipment. The mathematical model for calculating the monetary costs for each flow of substance and energy in the system is presented. Following the evolution of the exergoeconomic performance parameters, the optimization strategy is developed to reduce the exergy consumption in the system by choosing larger or higher-performance equipment. When reducing the temperature differences in the system heat exchangers (ORC boiler, condenser, and VCRC evaporator), the unitary cost of the refrigeration drops by 44%. The increase in the isentropic efficiency of the ORC expander and VCRC compressor further reduces the unitary cost of refrigeration by another 15%. Following the optimization procedure, the cost of the cooling unit drops by half. The cost of diesel fuel has a major influence on the unit cost of cooling. A doubling of the cost of diesel fuel leads to an 80% increase in the cost of the cold unit. The original merit of the work is to present a detailed and comprehensive model of optimization based on exergoeconomic principles that can serve as an example for any thermal system optimization.https://www.mdpi.com/1099-4300/25/11/1531exergy analysisdiesel engineheat exchangerexergy destructionexergoeconomic correlationexergoeconomic cost assessment |
| spellingShingle | Daniel Taban Valentin Apostol Lavinia Grosu Mugur C. Balan Horatiu Pop Catalina Dobre Alexandru Dobrovicescu Exergoeconomic Analysis of a Mechanical Compression Refrigeration Unit Run by an ORC Entropy exergy analysis diesel engine heat exchanger exergy destruction exergoeconomic correlation exergoeconomic cost assessment |
| title | Exergoeconomic Analysis of a Mechanical Compression Refrigeration Unit Run by an ORC |
| title_full | Exergoeconomic Analysis of a Mechanical Compression Refrigeration Unit Run by an ORC |
| title_fullStr | Exergoeconomic Analysis of a Mechanical Compression Refrigeration Unit Run by an ORC |
| title_full_unstemmed | Exergoeconomic Analysis of a Mechanical Compression Refrigeration Unit Run by an ORC |
| title_short | Exergoeconomic Analysis of a Mechanical Compression Refrigeration Unit Run by an ORC |
| title_sort | exergoeconomic analysis of a mechanical compression refrigeration unit run by an orc |
| topic | exergy analysis diesel engine heat exchanger exergy destruction exergoeconomic correlation exergoeconomic cost assessment |
| url | https://www.mdpi.com/1099-4300/25/11/1531 |
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