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Climate 2019, 7(1), 1; https://doi.org/10.3390/cli7010001

On the Development and Optimization of an Urban Design Comfort Model (UDCM) on a Passive Solar Basis at Mid-Latitude Sites

1
Head of Architecture Engineering Department, Military Technical College, Kobry Elkobba, Cairo 11766, Egypt
2
Automobile Mechanical Engineering Department, Military Technical College, Kobry Elkobba, Cairo 11766, Egypt
3
Architecture Engineering Department, Military Technical College, Kobry Elkobba, Cairo 11766, Egypt
4
Architecture Department, Prince Sultan University, 66833 Riyadh, Saudi Arabia
*
Author to whom correspondence should be addressed.
Received: 11 November 2018 / Revised: 14 December 2018 / Accepted: 18 December 2018 / Published: 24 December 2018
(This article belongs to the Special Issue Climate Change Resilience and Urban Sustainability)
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Abstract

Urban climatology is a complex field owed to the intersecting parameters. In city planning, neighborhood fabric and vegetation plays a great role in modifying arid microclimates. This work presents an approach to enable urban designers to find the optimum land use parameters to achieve pedestrian thermal comfort. In this study, a model was developed based on ENVI-met simulations of two urban and suburban sites in Cairo, Egypt. Initial design parameters were; compactness degree, grass coverage, leaf area density, trees ground coverage, and asphalt and buildings areas. After regression analysis, the step-wise algorithm succeeded in creating the best fit of 94% R2 and 92% adjusted R2. The suggested Urban Design Comfort Model (UDCM) was examined using MATLAB to find the optimum design parameters. Optimum values were applied to generate primitive urban configurations using Grasshopper. The primitives were simulated again in ENVI-met to validate UDCM. The resulted value of Physiological Equivalent Temperature, PET at peak time was reduced from the initial result of ENVI-met (42.3 °C) in both sites to reach (38.7 °C) then (36.8 °C) after refinement with extra foliage. This approach, as a tool for urban designers, not only facilitates and speeds up urban form design process on a passive basis, but also provides deep insights on the development of UDCM considering all different city transects rather than two. View Full-Text
Keywords: urban development; optimization; PET; UDCM; ENVI-met; numerical simulations urban development; optimization; PET; UDCM; ENVI-met; numerical simulations
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fahmy, M.; Kamel, H.; Mokhtar, H.; Elwy, I.; Gimiee, A.; Ibrahim, Y.; Abdelalim, M. On the Development and Optimization of an Urban Design Comfort Model (UDCM) on a Passive Solar Basis at Mid-Latitude Sites. Climate 2019, 7, 1.

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