Pre-cooling water applied to porous plates of evaporative cooling systems
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , |
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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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 |
_version_ |
1807835212384567296 |