Thermodynamic Analysis of a Solar Combined Ejector Absorption Cooling System
The objective of this paper is to investigate theoretically a solar driven 60 kW absorption cooling system. The system is constituted of a combined ejector single-effect absorption cycle coupled with a linear Fresnel solar concentrator and using water/lithium bromide as working fluid. The combined e...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Journal of Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/7090524 |
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| _version_ | 1832558444637323264 |
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| author | Doniazed Sioud Raoudha Garma Ahmed Bellagi |
| author_facet | Doniazed Sioud Raoudha Garma Ahmed Bellagi |
| author_sort | Doniazed Sioud |
| collection | DOAJ |
| description | The objective of this paper is to investigate theoretically a solar driven 60 kW absorption cooling system. The system is constituted of a combined ejector single-effect absorption cycle coupled with a linear Fresnel solar concentrator and using water/lithium bromide as working fluid. The combined ejector single-effect absorption cycle exhibits high performances, almost equal to that of double-effect absorption device. However, higher driving heat temperatures are required than in the case of conventional single-effect machines. A mathematical model is set up to analyze the optical performance of the linear Fresnel concentrator. Simulations are carried out to study the overall system performance COPsystem and the performances of the combined absorption machine COPcycle for generator driving temperatures and pressures in the ranges 180°C – 210°C and 198 kPa – 270 kPa, respectively. Further, the effect of operating parameters such as the cooling medium and chilled water temperatures is investigated. A maximum cycle performance of 1.03 is found for a generator pressure of 272 kPa and chilled and cooling water temperatures of 7°C and 25°C, respectively. A case study is investigated for a typical summer Tunisian day, from 8:00 to 18:00. The effect of ambient temperature and solar radiation on cycle and system performances is simulated. The optical performances of the concentrator are also analyzed. Simulation results show that between 11:00 and 14:00 the collector efficiency is 0.61 and that the COPcycle reaches values always higher than 0.9 and the COPsystem is larger than 0.55. Globally the performances of the investigated cycle are similar to those of double-effect conventional absorption system. |
| format | Article |
| id | doaj-art-43657473e8eb479f9454be3125a63e59 |
| institution | Kabale University |
| issn | 2314-4904 2314-4912 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Engineering |
| spelling | doaj-art-43657473e8eb479f9454be3125a63e592025-02-03T01:32:16ZengWileyJournal of Engineering2314-49042314-49122018-01-01201810.1155/2018/70905247090524Thermodynamic Analysis of a Solar Combined Ejector Absorption Cooling SystemDoniazed Sioud0Raoudha Garma1Ahmed Bellagi2Energy Engineering Department, Ecole Nationale d’Ingénieurs de Monastir (ENIM), University of Monastir, TunisiaEnergy Engineering Department, Ecole Nationale d’Ingénieurs de Monastir (ENIM), University of Monastir, TunisiaEnergy Engineering Department, Ecole Nationale d’Ingénieurs de Monastir (ENIM), University of Monastir, TunisiaThe objective of this paper is to investigate theoretically a solar driven 60 kW absorption cooling system. The system is constituted of a combined ejector single-effect absorption cycle coupled with a linear Fresnel solar concentrator and using water/lithium bromide as working fluid. The combined ejector single-effect absorption cycle exhibits high performances, almost equal to that of double-effect absorption device. However, higher driving heat temperatures are required than in the case of conventional single-effect machines. A mathematical model is set up to analyze the optical performance of the linear Fresnel concentrator. Simulations are carried out to study the overall system performance COPsystem and the performances of the combined absorption machine COPcycle for generator driving temperatures and pressures in the ranges 180°C – 210°C and 198 kPa – 270 kPa, respectively. Further, the effect of operating parameters such as the cooling medium and chilled water temperatures is investigated. A maximum cycle performance of 1.03 is found for a generator pressure of 272 kPa and chilled and cooling water temperatures of 7°C and 25°C, respectively. A case study is investigated for a typical summer Tunisian day, from 8:00 to 18:00. The effect of ambient temperature and solar radiation on cycle and system performances is simulated. The optical performances of the concentrator are also analyzed. Simulation results show that between 11:00 and 14:00 the collector efficiency is 0.61 and that the COPcycle reaches values always higher than 0.9 and the COPsystem is larger than 0.55. Globally the performances of the investigated cycle are similar to those of double-effect conventional absorption system.http://dx.doi.org/10.1155/2018/7090524 |
| spellingShingle | Doniazed Sioud Raoudha Garma Ahmed Bellagi Thermodynamic Analysis of a Solar Combined Ejector Absorption Cooling System Journal of Engineering |
| title | Thermodynamic Analysis of a Solar Combined Ejector Absorption Cooling System |
| title_full | Thermodynamic Analysis of a Solar Combined Ejector Absorption Cooling System |
| title_fullStr | Thermodynamic Analysis of a Solar Combined Ejector Absorption Cooling System |
| title_full_unstemmed | Thermodynamic Analysis of a Solar Combined Ejector Absorption Cooling System |
| title_short | Thermodynamic Analysis of a Solar Combined Ejector Absorption Cooling System |
| title_sort | thermodynamic analysis of a solar combined ejector absorption cooling system |
| url | http://dx.doi.org/10.1155/2018/7090524 |
| work_keys_str_mv | AT doniazedsioud thermodynamicanalysisofasolarcombinedejectorabsorptioncoolingsystem AT raoudhagarma thermodynamicanalysisofasolarcombinedejectorabsorptioncoolingsystem AT ahmedbellagi thermodynamicanalysisofasolarcombinedejectorabsorptioncoolingsystem |