Mehran University Research Journal Of Engineering &
Technology (HEC Recognized In Category "X")
Publishing Since 1982.



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Heat Removal Under Various Wind Speeds

Keywords: Velocity Variation, Wide Streets, Narrow Streets, Area-Weighted Temperature.

Mehran University Research Journal of Engineering & Technology

Volume 30 ,  Issue 3

Rizwan  Ahmed  Memon,Muhammad  Aslam  Uqaili,Ashfaque  Ahmed  Hashmani

Abstract

This paper investigated the impact of velocity variation in wide streets. The building AR (Aspect Ratio) (Street-canyon-width-to-building-height i.e. W/H) has been calculated by varying the width of street canyon. The k-? turbulence model was applied to ideal street canyons of aspect ratio 0.5, 0.75 and 1.0 while the wind speed was varied from 0.5 to 4.0 m/s. The street canyon aspect ratio 1.0 was obtained by increasing the width of the street two times (i.e. W=1) as much as for AR0.5 (i.e. W=0.5). However, different results obtained from AR1 were compared with AR0.5 to analyze the impact of wide streets. Results show that the temperatures reduce with an increase in ambient wind speed. However, the impact of ambient wind speed was comparatively higher in narrow street canyons since temperature reduced by over 1.4 K with an increase of 3.5 m/s in ambient wind speed. On the other hand, in the case of AR1.0 the area weighted average temperature reduced by 1.3 K with an increase of 3.5 m/s in ambient wind speed. It is found that removing heat from narrower street canyons is comparatively difficult. Results show that the temperatures within the target street canyon of AR0.5 with ambient wind speed of 0.5 m/s were around 0.71 K higher than that in AR1.