Improving the performance of a commercial absorption cooling system by using ejector: A theoretical study
<p>Absorption cooling systems (ACS) have lower coefficients of performance (COP) compared to direct expansion (DX) cooling systems. Nevertheless, ACS offers a green alternative to typical DX systems. In this study, a numerical model was developed for the commercial low-capacity Robur® absorpti...
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| منشور في: |
2023
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| _version_ | 1864513529507217408 |
|---|---|
| author | Hamza K. Mukhtar (17821004) |
| author2 | Saud Ghani (7205633) |
| author2_role | author |
| author_facet | Hamza K. Mukhtar (17821004) Saud Ghani (7205633) |
| author_role | author |
| dc.creator.none.fl_str_mv | Hamza K. Mukhtar (17821004) Saud Ghani (7205633) |
| dc.date.none.fl_str_mv | 2023-05-01T00:00:00Z |
| dc.identifier.none.fl_str_mv | 10.1016/j.csite.2023.102967 |
| dc.relation.none.fl_str_mv | https://figshare.com/articles/journal_contribution/Improving_the_performance_of_a_commercial_absorption_cooling_system_by_using_ejector_A_theoretical_study/25036415 |
| dc.rights.none.fl_str_mv | CC BY 4.0 info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Engineering Electrical engineering Fluid mechanics and thermal engineering Absorption cooling Cooling system Ammonia-water Robur chiller Ejector |
| dc.title.none.fl_str_mv | Improving the performance of a commercial absorption cooling system by using ejector: A theoretical study |
| dc.type.none.fl_str_mv | Text Journal contribution info:eu-repo/semantics/publishedVersion text contribution to journal |
| description | <p>Absorption cooling systems (ACS) have lower coefficients of performance (COP) compared to direct expansion (DX) cooling systems. Nevertheless, ACS offers a green alternative to typical DX systems. In this study, a numerical model was developed for the commercial low-capacity Robur® absorption cooling system (RACS). The model was developed based on mass, concentration, and energy balance equations, in addition to heat transfer equations. The model results were validated against experimental data available in the literature for the same cooling unit yielding a good agreement. Hence, to improve the COP of the RACS, a vapor ejector was introduced between the generator and the condenser. An improvement of 70.6% in the COP was obtained at the design condition. A parametric analysis was implemented to study the significance of the key parameters in the RACS performance. It was found that the increase in the ambient temperature not only increased the activation temperature, but it also decreased the COP and increased the circulation ratio (CR). Consequently, in hot environments, lowering the evaporator temperature is recommended to avoid the need for higher CR. Optimizing the nozzle throat and the mixing tube diameter improves the ejector performance, and hence the RACS performance, as long as the ejector operates under critical conditions. Finally, the absorber coil was found to have the most significance on the RACS performance in comparison with the rectifier coil and the refrigerant heat exchanger.</p><h2>Other Information</h2> <p> Published in: Case Studies in Thermal Engineering<br> License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.csite.2023.102967" target="_blank">https://dx.doi.org/10.1016/j.csite.2023.102967</a></p> |
| eu_rights_str_mv | openAccess |
| id | Manara2_6efaff4e8ecd98e99a633f5f2b2a881d |
| identifier_str_mv | 10.1016/j.csite.2023.102967 |
| network_acronym_str | Manara2 |
| network_name_str | Manara2 |
| oai_identifier_str | oai:figshare.com:article/25036415 |
| publishDate | 2023 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| rights_invalid_str_mv | CC BY 4.0 |
| spelling | Improving the performance of a commercial absorption cooling system by using ejector: A theoretical studyHamza K. Mukhtar (17821004)Saud Ghani (7205633)EngineeringElectrical engineeringFluid mechanics and thermal engineeringAbsorption coolingCooling systemAmmonia-waterRobur chillerEjector<p>Absorption cooling systems (ACS) have lower coefficients of performance (COP) compared to direct expansion (DX) cooling systems. Nevertheless, ACS offers a green alternative to typical DX systems. In this study, a numerical model was developed for the commercial low-capacity Robur® absorption cooling system (RACS). The model was developed based on mass, concentration, and energy balance equations, in addition to heat transfer equations. The model results were validated against experimental data available in the literature for the same cooling unit yielding a good agreement. Hence, to improve the COP of the RACS, a vapor ejector was introduced between the generator and the condenser. An improvement of 70.6% in the COP was obtained at the design condition. A parametric analysis was implemented to study the significance of the key parameters in the RACS performance. It was found that the increase in the ambient temperature not only increased the activation temperature, but it also decreased the COP and increased the circulation ratio (CR). Consequently, in hot environments, lowering the evaporator temperature is recommended to avoid the need for higher CR. Optimizing the nozzle throat and the mixing tube diameter improves the ejector performance, and hence the RACS performance, as long as the ejector operates under critical conditions. Finally, the absorber coil was found to have the most significance on the RACS performance in comparison with the rectifier coil and the refrigerant heat exchanger.</p><h2>Other Information</h2> <p> Published in: Case Studies in Thermal Engineering<br> License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.csite.2023.102967" target="_blank">https://dx.doi.org/10.1016/j.csite.2023.102967</a></p>2023-05-01T00:00:00ZTextJournal contributioninfo:eu-repo/semantics/publishedVersiontextcontribution to journal10.1016/j.csite.2023.102967https://figshare.com/articles/journal_contribution/Improving_the_performance_of_a_commercial_absorption_cooling_system_by_using_ejector_A_theoretical_study/25036415CC BY 4.0info:eu-repo/semantics/openAccessoai:figshare.com:article/250364152023-05-01T00:00:00Z |
| spellingShingle | Improving the performance of a commercial absorption cooling system by using ejector: A theoretical study Hamza K. Mukhtar (17821004) Engineering Electrical engineering Fluid mechanics and thermal engineering Absorption cooling Cooling system Ammonia-water Robur chiller Ejector |
| status_str | publishedVersion |
| title | Improving the performance of a commercial absorption cooling system by using ejector: A theoretical study |
| title_full | Improving the performance of a commercial absorption cooling system by using ejector: A theoretical study |
| title_fullStr | Improving the performance of a commercial absorption cooling system by using ejector: A theoretical study |
| title_full_unstemmed | Improving the performance of a commercial absorption cooling system by using ejector: A theoretical study |
| title_short | Improving the performance of a commercial absorption cooling system by using ejector: A theoretical study |
| title_sort | Improving the performance of a commercial absorption cooling system by using ejector: A theoretical study |
| topic | Engineering Electrical engineering Fluid mechanics and thermal engineering Absorption cooling Cooling system Ammonia-water Robur chiller Ejector |