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New Mexico State University (2021)

Thermodynamic Aspects of Urban Landscaping

Kanaan, Ahmed

Titre : Thermodynamic Aspects of Urban Landscaping

Auteur : Kanaan, Ahmed

Université de soutenance : New Mexico State University

Grade : Doctor of Philosophy (PhD) Mechanical Engineering 2021

Résumé
Strategies to conserve water have been implemented by many municipalities in the US Southwest to minimize quantities of water used for irrigating urban landscapes. One argument made in the desert southwestern United States for replacing natural grass with xeric or artificial landscapes is that water is not needed for irrigation. This strategy not only ignores the numerous benefits derived from the turf-grasses, but it fails to recognize the energy savings for the buildings surrounded by green landscapes. Quantitative analysis of the effect and importance of different types of landscapes on urban heat load and the subsequent energy consumption inside those buildings is of great practical need. An experiment was conducted at New Mexico State University to evaluate and study the heat effect from this landscapes and a comparison between them in terms of the amount of heat transferred to urban, as well as the amount of water used in the process of cooling and comparing it with the amount of water required in generating electrical energy. Based on the heat balance equation to utilize the heat input to the building, and to identify the dominant heat load mechanisms. Also, determine heat dissipation from artificial turf and the amount of water needed to cooling down the surface to the neutral grass. Our results show that over- all heat load from the xeric landscape is noticeably higher than the one from grass landscape. Based on these data, we assess the potential for energy and water savings by utilizing turf-grass landscaping. For the artificial turf, the over a 24-h period the amount of water (3.00 to 5.00 mm) required to maintain artificial turf at temperatures like irrigated natural turf grass. Based on this data, we are assessing the energy saving and water-saving with grassland landscapes. Also, we found that the difference between turf grass and xeric landscaping in cooling load is $406 annually, where it was considered the amount of water spent in the generating electrical energy. Through the above and relying on practical results, natural grass is better in term of heat load and the amount of water required in the irrigation process.

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Page publiée le 7 décembre 2021