Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates
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...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Universidad Nacional de Colombia
2017-10-01
|
| Series: | Dyna |
| Subjects: | |
| Online Access: | https://revistas.unal.edu.co/index.php/dyna/article/view/59564 |
| _version_ | 1828952531449937920 |
|---|---|
| author | Flavio Alves-Damasceno Luciano Barreto-Mendes Tadayuki Yanagi Junior Jofran Luiz de Oliveira Jairo Alexander Osorio-Saraz |
| author_facet | Flavio Alves-Damasceno Luciano Barreto-Mendes Tadayuki Yanagi Junior Jofran Luiz de Oliveira Jairo Alexander Osorio-Saraz |
| author_sort | Flavio Alves-Damasceno |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-14T06:54:45Z |
| format | Article |
| id | doaj.art-2a4885cdee1d4b8a96c66feee41478a5 |
| institution | Directory Open Access Journal |
| issn | 0012-7353 2346-2183 |
| language | English |
| last_indexed | 2024-12-14T06:54:45Z |
| publishDate | 2017-10-01 |
| publisher | Universidad Nacional de Colombia |
| record_format | Article |
| series | Dyna |
| spelling | doaj.art-2a4885cdee1d4b8a96c66feee41478a52022-12-21T23:12:44ZengUniversidad Nacional de ColombiaDyna0012-73532346-21832017-10-018420311812510.15446/dyna.v84n203.5956446958Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous platesFlavio Alves-DamascenoLuciano Barreto-MendesTadayuki Yanagi JuniorJofran Luiz de OliveiraJairo Alexander Osorio-SarazThe 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.https://revistas.unal.edu.co/index.php/dyna/article/view/59564Greenhousemathematical modelingsimulationheat and mass transfer |
| spellingShingle | Flavio Alves-Damasceno Luciano Barreto-Mendes Tadayuki Yanagi Junior Jofran Luiz de Oliveira Jairo Alexander Osorio-Saraz Assessment of evaporative cooling efficiency in greenhouses equiped with wetted porous plates Dyna Greenhouse mathematical modeling simulation heat and mass transfer |
| title | 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_short | 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 |
| topic | Greenhouse mathematical modeling simulation heat and mass transfer |
| url | https://revistas.unal.edu.co/index.php/dyna/article/view/59564 |
| work_keys_str_mv | AT flavioalvesdamasceno assessmentofevaporativecoolingefficiencyingreenhousesequipedwithwettedporousplates AT lucianobarretomendes assessmentofevaporativecoolingefficiencyingreenhousesequipedwithwettedporousplates AT tadayukiyanagijunior assessmentofevaporativecoolingefficiencyingreenhousesequipedwithwettedporousplates AT jofranluizdeoliveira assessmentofevaporativecoolingefficiencyingreenhousesequipedwithwettedporousplates AT jairoalexanderosoriosaraz assessmentofevaporativecoolingefficiencyingreenhousesequipedwithwettedporousplates |