Heat and mass transfer in falling films technology applied to the generator and the rectifier of an ammonia-water absorption refrigeration cycle
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng fra |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.ijrefrig.2021.11.033 http://hdl.handle.net/11449/230642 |
Resumo: | Powering ammonia-water absorption refrigeration cycles with solar energy demands an operating temperature above 170 ∘C for the proper generator operation when conventional flooded generator technologies are used. However, the falling film technology operates at a lower temperature due its superior heat and mass transfer performance. Therefore, an experimental investigation focused on the energy balance along with a heat and mass transfer analysis between liquid and vapor ammonia-water mixtures in the generator and the rectifier have been developed. Four experimental sets of runs were carried out for oil temperatures at 111 and 136 ∘C, strong solution mass fraction between 0.37 and 0.47, two rectification temperatures at 34 and 63 ∘C, and a strong solution mass flow rate of 0.016-0.027 kgs−1. Heat transfer rates for both components were computed by overall energy balances over the components. Moreover, the latent heat and sensible heat rate were calculated. The results indicated that the heat transfer process in the rectifier was lower for the minimum generation temperature. The maximum heat transfer coefficients for the liquid and vapor phase were respectively 5476 and 26Wm−2∘C−1. Analogously, the maximum mass transfer coefficients between the liquid film and vapor phase were 1.27·10−4 and 3.25·10−2ms−1. |
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Heat and mass transfer in falling films technology applied to the generator and the rectifier of an ammonia-water absorption refrigeration cycleTransfert de chaleur et de masse dans la technologie des films tombants appliquée au générateur et au rectificateur d'un cycle frigorifique à absorption d'ammoniac-eauAbsorption Refrigeration cycleAmmonia-waterGenerationHeat and mass transferRectificationRefrigerationPowering ammonia-water absorption refrigeration cycles with solar energy demands an operating temperature above 170 ∘C for the proper generator operation when conventional flooded generator technologies are used. However, the falling film technology operates at a lower temperature due its superior heat and mass transfer performance. Therefore, an experimental investigation focused on the energy balance along with a heat and mass transfer analysis between liquid and vapor ammonia-water mixtures in the generator and the rectifier have been developed. Four experimental sets of runs were carried out for oil temperatures at 111 and 136 ∘C, strong solution mass fraction between 0.37 and 0.47, two rectification temperatures at 34 and 63 ∘C, and a strong solution mass flow rate of 0.016-0.027 kgs−1. Heat transfer rates for both components were computed by overall energy balances over the components. Moreover, the latent heat and sensible heat rate were calculated. The results indicated that the heat transfer process in the rectifier was lower for the minimum generation temperature. The maximum heat transfer coefficients for the liquid and vapor phase were respectively 5476 and 26Wm−2∘C−1. Analogously, the maximum mass transfer coefficients between the liquid film and vapor phase were 1.27·10−4 and 3.25·10−2ms−1.SISEA - Renewable and Alternative Energy Systems Laboratory Escola Politécnica at University of São PauloGrupo de Energía y Termodinámica Facultad de Ingeniería Mecánica Universidad Pontificia Bolivariana, Circular 1 No. 70-01Sao Paulo State University -Unesp Campus of Itapeva Rua Geraldo Alckmin, 519, 18409−010 ItapevaSao Paulo State University -Unesp Campus of Itapeva Rua Geraldo Alckmin, 519, 18409−010 ItapevaUniversidade de São Paulo (USP)Universidad Pontificia BolivarianaUniversidade Estadual Paulista (UNESP)Narváez-Romo, BeethovenZavaleta-Aguilar, Elí W. [UNESP]Simões-Moreira, José R.2022-04-29T08:41:20Z2022-04-29T08:41:20Z2022-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article276-287http://dx.doi.org/10.1016/j.ijrefrig.2021.11.033International Journal of Refrigeration, v. 135, p. 276-287.0140-7007http://hdl.handle.net/11449/23064210.1016/j.ijrefrig.2021.11.0332-s2.0-85127190909Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengfraInternational Journal of Refrigerationinfo:eu-repo/semantics/openAccess2022-05-11T17:32:42Zoai:repositorio.unesp.br:11449/230642Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:47:14.250035Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Heat and mass transfer in falling films technology applied to the generator and the rectifier of an ammonia-water absorption refrigeration cycle Transfert de chaleur et de masse dans la technologie des films tombants appliquée au générateur et au rectificateur d'un cycle frigorifique à absorption d'ammoniac-eau |
title |
Heat and mass transfer in falling films technology applied to the generator and the rectifier of an ammonia-water absorption refrigeration cycle |
spellingShingle |
Heat and mass transfer in falling films technology applied to the generator and the rectifier of an ammonia-water absorption refrigeration cycle Narváez-Romo, Beethoven Absorption Refrigeration cycle Ammonia-water Generation Heat and mass transfer Rectification Refrigeration |
title_short |
Heat and mass transfer in falling films technology applied to the generator and the rectifier of an ammonia-water absorption refrigeration cycle |
title_full |
Heat and mass transfer in falling films technology applied to the generator and the rectifier of an ammonia-water absorption refrigeration cycle |
title_fullStr |
Heat and mass transfer in falling films technology applied to the generator and the rectifier of an ammonia-water absorption refrigeration cycle |
title_full_unstemmed |
Heat and mass transfer in falling films technology applied to the generator and the rectifier of an ammonia-water absorption refrigeration cycle |
title_sort |
Heat and mass transfer in falling films technology applied to the generator and the rectifier of an ammonia-water absorption refrigeration cycle |
author |
Narváez-Romo, Beethoven |
author_facet |
Narváez-Romo, Beethoven Zavaleta-Aguilar, Elí W. [UNESP] Simões-Moreira, José R. |
author_role |
author |
author2 |
Zavaleta-Aguilar, Elí W. [UNESP] Simões-Moreira, José R. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidad Pontificia Bolivariana Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Narváez-Romo, Beethoven Zavaleta-Aguilar, Elí W. [UNESP] Simões-Moreira, José R. |
dc.subject.por.fl_str_mv |
Absorption Refrigeration cycle Ammonia-water Generation Heat and mass transfer Rectification Refrigeration |
topic |
Absorption Refrigeration cycle Ammonia-water Generation Heat and mass transfer Rectification Refrigeration |
description |
Powering ammonia-water absorption refrigeration cycles with solar energy demands an operating temperature above 170 ∘C for the proper generator operation when conventional flooded generator technologies are used. However, the falling film technology operates at a lower temperature due its superior heat and mass transfer performance. Therefore, an experimental investigation focused on the energy balance along with a heat and mass transfer analysis between liquid and vapor ammonia-water mixtures in the generator and the rectifier have been developed. Four experimental sets of runs were carried out for oil temperatures at 111 and 136 ∘C, strong solution mass fraction between 0.37 and 0.47, two rectification temperatures at 34 and 63 ∘C, and a strong solution mass flow rate of 0.016-0.027 kgs−1. Heat transfer rates for both components were computed by overall energy balances over the components. Moreover, the latent heat and sensible heat rate were calculated. The results indicated that the heat transfer process in the rectifier was lower for the minimum generation temperature. The maximum heat transfer coefficients for the liquid and vapor phase were respectively 5476 and 26Wm−2∘C−1. Analogously, the maximum mass transfer coefficients between the liquid film and vapor phase were 1.27·10−4 and 3.25·10−2ms−1. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-04-29T08:41:20Z 2022-04-29T08:41:20Z 2022-03-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.ijrefrig.2021.11.033 International Journal of Refrigeration, v. 135, p. 276-287. 0140-7007 http://hdl.handle.net/11449/230642 10.1016/j.ijrefrig.2021.11.033 2-s2.0-85127190909 |
url |
http://dx.doi.org/10.1016/j.ijrefrig.2021.11.033 http://hdl.handle.net/11449/230642 |
identifier_str_mv |
International Journal of Refrigeration, v. 135, p. 276-287. 0140-7007 10.1016/j.ijrefrig.2021.11.033 2-s2.0-85127190909 |
dc.language.iso.fl_str_mv |
eng fra |
language |
eng fra |
dc.relation.none.fl_str_mv |
International Journal of Refrigeration |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
276-287 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128858209124352 |