Pre-cooling water applied to porous plates of evaporative cooling systems

Detalhes bibliográficos
Autor(a) principal: Fernandes, João Levi Bastos
Data de Publicação: 2022
Outros Autores: Yanagi Junior, Tadayuki, Moura, Giselle Borges de, Ribeiro, Alex de Oliveira
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/50892
Resumo: This study assessed the ways the thermal environment is influenced by pre-cooling the water employed in wetting the porous plates present in the evaporative cooling systems (ECS). The experiment was performed using two physical models constructed on a distorted and reduced scale, which simulated closed agricultural facilities equipped with ECS made up of porous cellulose panels. In one physical model, the plates were made wet using chilled water (ECScw), while in the other they were moistened using natural water, at environment temperature (ECSnw). Both inside the physical models and outside, in the external environment, the air dry-bulb temperature (tdb), black globe temperature (tbg) and air relative humidity (RH) were measured, at 10 sec intervals. Later, the environmental indices, ECSnw cooling effectiveness and ECScw performance factor were assessed. When the porous ECS plates were thoroughly wet using pre-cooled water, lowering of the thermal variables and comfort indices was seen to be greater than when wetting the plates was done using water at room temperature. An empirical equation was proposed to determine the cooling performance factor applied to the ECScw related to water temperature, tdb and air wet-bulb temperature.
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spelling Pre-cooling water applied to porous plates of evaporative cooling systemsEfeito do pré-resfriamento da água aplicada em placas porosas de sistemas de resfriamento evaporativoThermal environmentAir coolingAir conditioningChilled waterAmbiente térmicoResfriamento de arCondicionamento de arThis study assessed the ways the thermal environment is influenced by pre-cooling the water employed in wetting the porous plates present in the evaporative cooling systems (ECS). The experiment was performed using two physical models constructed on a distorted and reduced scale, which simulated closed agricultural facilities equipped with ECS made up of porous cellulose panels. In one physical model, the plates were made wet using chilled water (ECScw), while in the other they were moistened using natural water, at environment temperature (ECSnw). Both inside the physical models and outside, in the external environment, the air dry-bulb temperature (tdb), black globe temperature (tbg) and air relative humidity (RH) were measured, at 10 sec intervals. Later, the environmental indices, ECSnw cooling effectiveness and ECScw performance factor were assessed. When the porous ECS plates were thoroughly wet using pre-cooled water, lowering of the thermal variables and comfort indices was seen to be greater than when wetting the plates was done using water at room temperature. An empirical equation was proposed to determine the cooling performance factor applied to the ECScw related to water temperature, tdb and air wet-bulb temperature.Objetivou-se com o presente trabalho avaliar o efeito do pré-resfriamento da água usada no molhamento de placas porosas de sistemas de resfriamento evaporativo (SRE) sobre o ambiente térmico. O experimento foi realizado em dois modelos físicos construídos em escala reduzida e distorcida que simularam instalações agrícolas fechadas, equipadas com SRE composto por painéis porosos de celulose. Em um modelo físico, o molhamento das placas foi realizado por meio de água resfriada (SRAR) e o outro por meio de água natural à temperatura ambiente (SRAN). Mensurou-se a temperatura de bulbo seco do ar (tbs), temperatura de globo negro (tgn) e umidade relativa do ar (UR) no interior dos modelos físicos e no ambiente externo em intervalos de 10s. Posteriormente, foram calculados índices ambientais, a efetividade de resfriamento do SRAN e fator de desempenho do SRAR. O pré-resfriamento da água usada no molhamento de placas porosas de SRE propiciou maior redução nas variáveis térmicas e índices de conforto em relação ao molhamento com água à temperatura ambiente, sendo proposta uma equação empírica para a estimativa do fator de desempenho de resfriamento aplicada ao SRAR em função da temperatura da água, da t bs e da temperatura de bulbo úmido do arUniversidade Federal de Santa Maria2022-08-08T19:59:42Z2022-08-08T19:59:42Z2022info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfFERNANDES, J. L. B. et al. Pre-cooling water applied to porous plates of evaporative cooling systems. Ciência Rural, Santa Maria, v. 52, n. 11, 2022. DOI: 10.1590/0103-8478cr20201015.http://repositorio.ufla.br/jspui/handle/1/50892Ciência Ruralreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessFernandes, João Levi BastosYanagi Junior, TadayukiMoura, Giselle Borges deRibeiro, Alex de Oliveiraeng2023-05-03T11:52:57Zoai:localhost:1/50892Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2023-05-03T11:52:57Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Pre-cooling water applied to porous plates of evaporative cooling systems
Efeito do pré-resfriamento da água aplicada em placas porosas de sistemas de resfriamento evaporativo
title Pre-cooling water applied to porous plates of evaporative cooling systems
spellingShingle Pre-cooling water applied to porous plates of evaporative cooling systems
Fernandes, João Levi Bastos
Thermal environment
Air cooling
Air conditioning
Chilled water
Ambiente térmico
Resfriamento de ar
Condicionamento de ar
title_short Pre-cooling water applied to porous plates of evaporative cooling systems
title_full Pre-cooling water applied to porous plates of evaporative cooling systems
title_fullStr Pre-cooling water applied to porous plates of evaporative cooling systems
title_full_unstemmed Pre-cooling water applied to porous plates of evaporative cooling systems
title_sort Pre-cooling water applied to porous plates of evaporative cooling systems
author Fernandes, João Levi Bastos
author_facet Fernandes, João Levi Bastos
Yanagi Junior, Tadayuki
Moura, Giselle Borges de
Ribeiro, Alex de Oliveira
author_role author
author2 Yanagi Junior, Tadayuki
Moura, Giselle Borges de
Ribeiro, Alex de Oliveira
author2_role author
author
author
dc.contributor.author.fl_str_mv Fernandes, João Levi Bastos
Yanagi Junior, Tadayuki
Moura, Giselle Borges de
Ribeiro, Alex de Oliveira
dc.subject.por.fl_str_mv Thermal environment
Air cooling
Air conditioning
Chilled water
Ambiente térmico
Resfriamento de ar
Condicionamento de ar
topic Thermal environment
Air cooling
Air conditioning
Chilled water
Ambiente térmico
Resfriamento de ar
Condicionamento de ar
description This study assessed the ways the thermal environment is influenced by pre-cooling the water employed in wetting the porous plates present in the evaporative cooling systems (ECS). The experiment was performed using two physical models constructed on a distorted and reduced scale, which simulated closed agricultural facilities equipped with ECS made up of porous cellulose panels. In one physical model, the plates were made wet using chilled water (ECScw), while in the other they were moistened using natural water, at environment temperature (ECSnw). Both inside the physical models and outside, in the external environment, the air dry-bulb temperature (tdb), black globe temperature (tbg) and air relative humidity (RH) were measured, at 10 sec intervals. Later, the environmental indices, ECSnw cooling effectiveness and ECScw performance factor were assessed. When the porous ECS plates were thoroughly wet using pre-cooled water, lowering of the thermal variables and comfort indices was seen to be greater than when wetting the plates was done using water at room temperature. An empirical equation was proposed to determine the cooling performance factor applied to the ECScw related to water temperature, tdb and air wet-bulb temperature.
publishDate 2022
dc.date.none.fl_str_mv 2022-08-08T19:59:42Z
2022-08-08T19:59:42Z
2022
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 FERNANDES, J. L. B. et al. Pre-cooling water applied to porous plates of evaporative cooling systems. Ciência Rural, Santa Maria, v. 52, n. 11, 2022. DOI: 10.1590/0103-8478cr20201015.
http://repositorio.ufla.br/jspui/handle/1/50892
identifier_str_mv FERNANDES, J. L. B. et al. Pre-cooling water applied to porous plates of evaporative cooling systems. Ciência Rural, Santa Maria, v. 52, n. 11, 2022. DOI: 10.1590/0103-8478cr20201015.
url http://repositorio.ufla.br/jspui/handle/1/50892
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal de Santa Maria
publisher.none.fl_str_mv Universidade Federal de Santa Maria
dc.source.none.fl_str_mv Ciência Rural
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
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