Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates

Detalhes bibliográficos
Autor(a) principal: Alves-Damasceno, Flávio
Data de Publicação: 2017
Outros Autores: Barreto-Mendes, Luciano, Yanagi Junior, Tadayuki, Oliveira, Jofran Luiz de, Osorio-Saraz, Jairo Alexander
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/30949
Resumo: The main objective of this study was to experimentally validate a mechanistic model for predicting the cooling efficiency (η) of wetted porous plates built with expanded clay. The expanded clay material was physically characterized by specific mass, surface area, and volume. The model was validated with dry bulb temperature (Tdb, °C) and air relative humidity (RH, %) data, which were continuously monitored in two different points, upstream and downstream the direction of the air passing through the porous plate. Data collection was carried out consecutively for a period of 10 days, between 11:00 a.m. and 4:00 p.m. Average values for η, simulated and observed, were 74.8 ± 7.4% and 68.3 ± 8.3%, respectively. Based on the developed model, it was observed that η was higher than 40% for Tdb > 30 °C and constant RH at 45%. The simulation for predictions indicates that the increase in the air temperature greater than 20 °C may affect negatively the production in greenhouses from states located in tropical and subtropical countries as Minas Gerais, Brazil, if some design criteria in the evaporative cooling system are not revised.
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spelling Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous platesEvaluación de la eficiencia de equipos de enfriamiento evaporativo usando placas porosas en invernaderosGreenhouseMathematical modelingSimulationHeat and mass transferInvernaderoModelo matemáticoSimulaciónTransferencia de calor y masaThe main objective of this study was to experimentally validate a mechanistic model for predicting the cooling efficiency (η) of wetted porous plates built with expanded clay. The expanded clay material was physically characterized by specific mass, surface area, and volume. The model was validated with dry bulb temperature (Tdb, °C) and air relative humidity (RH, %) data, which were continuously monitored in two different points, upstream and downstream the direction of the air passing through the porous plate. Data collection was carried out consecutively for a period of 10 days, between 11:00 a.m. and 4:00 p.m. Average values for η, simulated and observed, were 74.8 ± 7.4% and 68.3 ± 8.3%, respectively. Based on the developed model, it was observed that η was higher than 40% for Tdb > 30 °C and constant RH at 45%. The simulation for predictions indicates that the increase in the air temperature greater than 20 °C may affect negatively the production in greenhouses from states located in tropical and subtropical countries as Minas Gerais, Brazil, if some design criteria in the evaporative cooling system are not revised.El objetivo principal de este estudio fue validar experimentalmente un modelo mecánistico para predecir la eficacia de enfriamiento (η) de placas porosas construidas con arcilla expandida. El material de arcilla expandida fue físicamente caracterizado encontrando su masa específica, área superficial y volumen. El modelo fue validado con datos de temperatura de bulbo seco (Tdb, ° C) y humedad relativa del aire (humedad relativa,%) que fueron continuamente monitoreados en dos puntos diferentes, en contra y a favor de la dirección del aire que pasa a través de la placa porosa. La recolección de datos se llevó a cabo de forma consecutiva durante un período de 10 días entre las 11:00 y 4:00 p.m. Los valores medios de η, simulados y observados, fueron 74,8 ± 7,4% y 68,3 ± 8,3%, respectivamente. Basado en el modelo desarrollado, se observó que η fue mayor del 40% para Tdb> 30 ° C y HR constante en 45%. La simulación indicó que el aumento de la temperatura del aire puede afectar negativamente la producción en invernaderos en Estados como Minas Gerais, Brazil, si no se revisan algunos criterios de diseño en el sistema de enfriamiento por evaporación.Universidad Nacional de Colombia2018-10-05T20:01:33Z2018-10-05T20:01:33Z2017-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfALVES-DAMASCENO, F. et al. Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates. Dyna, [S.l.], v. 84, n. 203, p. 118-125, Dec. 2017.http://repositorio.ufla.br/jspui/handle/1/30949Dynareponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessAlves-Damasceno, FlávioBarreto-Mendes, LucianoYanagi Junior, TadayukiOliveira, Jofran Luiz deOsorio-Saraz, Jairo Alexandereng2018-10-05T20:01:34Zoai:localhost:1/30949Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2018-10-05T20:01:34Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates
Evaluación de la eficiencia de equipos de enfriamiento evaporativo usando placas porosas en invernaderos
title Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates
spellingShingle Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates
Alves-Damasceno, Flávio
Greenhouse
Mathematical modeling
Simulation
Heat and mass transfer
Invernadero
Modelo matemático
Simulación
Transferencia de calor y masa
title_short Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates
title_full Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates
title_fullStr Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates
title_full_unstemmed Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates
title_sort Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates
author Alves-Damasceno, Flávio
author_facet Alves-Damasceno, Flávio
Barreto-Mendes, Luciano
Yanagi Junior, Tadayuki
Oliveira, Jofran Luiz de
Osorio-Saraz, Jairo Alexander
author_role author
author2 Barreto-Mendes, Luciano
Yanagi Junior, Tadayuki
Oliveira, Jofran Luiz de
Osorio-Saraz, Jairo Alexander
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Alves-Damasceno, Flávio
Barreto-Mendes, Luciano
Yanagi Junior, Tadayuki
Oliveira, Jofran Luiz de
Osorio-Saraz, Jairo Alexander
dc.subject.por.fl_str_mv Greenhouse
Mathematical modeling
Simulation
Heat and mass transfer
Invernadero
Modelo matemático
Simulación
Transferencia de calor y masa
topic Greenhouse
Mathematical modeling
Simulation
Heat and mass transfer
Invernadero
Modelo matemático
Simulación
Transferencia de calor y masa
description The main objective of this study was to experimentally validate a mechanistic model for predicting the cooling efficiency (η) of wetted porous plates built with expanded clay. The expanded clay material was physically characterized by specific mass, surface area, and volume. The model was validated with dry bulb temperature (Tdb, °C) and air relative humidity (RH, %) data, which were continuously monitored in two different points, upstream and downstream the direction of the air passing through the porous plate. Data collection was carried out consecutively for a period of 10 days, between 11:00 a.m. and 4:00 p.m. Average values for η, simulated and observed, were 74.8 ± 7.4% and 68.3 ± 8.3%, respectively. Based on the developed model, it was observed that η was higher than 40% for Tdb > 30 °C and constant RH at 45%. The simulation for predictions indicates that the increase in the air temperature greater than 20 °C may affect negatively the production in greenhouses from states located in tropical and subtropical countries as Minas Gerais, Brazil, if some design criteria in the evaporative cooling system are not revised.
publishDate 2017
dc.date.none.fl_str_mv 2017-12
2018-10-05T20:01:33Z
2018-10-05T20:01:33Z
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 ALVES-DAMASCENO, F. et al. Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates. Dyna, [S.l.], v. 84, n. 203, p. 118-125, Dec. 2017.
http://repositorio.ufla.br/jspui/handle/1/30949
identifier_str_mv ALVES-DAMASCENO, F. et al. Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates. Dyna, [S.l.], v. 84, n. 203, p. 118-125, Dec. 2017.
url http://repositorio.ufla.br/jspui/handle/1/30949
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional de Colombia
publisher.none.fl_str_mv Universidad Nacional de Colombia
dc.source.none.fl_str_mv Dyna
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_ 1784550039505338368

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