Direct evaporative cooling performance of ambient air using a ceramic wet porous layer
| Autor: | Monssif Najim, N. Labsi, M’barek Feddaoui, Y. K. Benkahla, K. Sellami, M. Oubella |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Water flow 020209 energy General Chemical Engineering Drop (liquid) Humidity 02 engineering and technology General Chemistry 020401 chemical engineering Mass transfer visual_art 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium Ceramic 0204 chemical engineering Composite material Porous medium Porosity Physics::Atmospheric and Oceanic Physics Evaporative cooler |
| Zdroj: | Chemical Engineering Research and Design. 142:225-236 |
| ISSN: | 0263-8762 |
| DOI: | 10.1016/j.cherd.2018.12.009 |
| Popis: | Direct evaporative cooling is one of the efficient traditional strategies to provide summer comfort in a building or air-conditioning in storage rooms. The present paper concerns a new mathematical approach to analyse the influence of the effective parameters on the performance of direct evaporation from a porous layer. The ambient air flows over a porous material, fed with water. The evaporation of an amount of water into the air reduces its temperature and, at the same time, raises the air’s humidity. A mathematical model that accounts for simultaneous heat and mass transfer characteristics in the ambient air and water flow in corporating non-Darcian model in the porous region within vertical parallel walls is presented. The solution of the mathematical model is based on the finite volume method and the velocity-pressure coupling is treated with the SIMPLE algorithm. The results showed that the porous evaporative cooler could satisfy the cooling requirements in arid climates. An average drop of 15 °C of air temperature below the ambient temperature can be reached at the considered conditions. Therefore, the ambient air is satisfactorily cooled. Furthermore, the better cooling performance can be achieved for a high porosity with a thick porous medium and lower air velocity at the entrance. |
| Databáze: | OpenAIRE |
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