Figure a canyon like environment. This can

Figure 2.

9 Photo showing a large amount of air conditionersFigure 2.9 shows that another source of wasted heat are the air conditioners hanging outside the wall of buildings. They take in cool air and extract warm air into the atmosphere. These human activities generate a large amount of wasted heat that causes a higher temperature in the area. The maximum temperature record in Whampoa is 32.1 °C, which is 0.4 °C higher than the maximum in temperature in Shatin.

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The lower temperature in Shatin can be backed by the fact that there are little wasted heat produced in the area.There are no commercial building in the area, the only source of wasted heat are from the vehicles that are passing by.Poor air ventilation in Whampoa are also the reasons why whampoa has a higher temperature than during daytime and nighttime than Shatin.  Figure 2.10 The wall effect and the urban canyon effect The “wall effect” occurs when outer building are blocking the wind from the inner buildings.

The buildings in Whampoa are built in a very compacted way, as a result the inner buildings will be a lot warmer than the outward building due to the fact the wind is blocked. This prevents cooling effect of wind and heat to escape. The “wall effect” does not occur in buildings in Shatin. As shown in figure 2.6, the buildings in Shatin are built in a linear way along the street so wind cannot be blocked since there are no outer buildings.The “canyon effect” occurs when a street is flanked by tall building side by side creating a canyon like environment.

This can be seen clearly in figure 2.8. “Street canyons” increases the temperature in the area as air circulation in the streets is insufficient when they are trapped by the tall building on the two sides.

As an result,  air circulation occurs at roof level instead of occurring at ground level. Having lots of traffic also worsen the “canyon” effect as the heat and pollutants produced from vehicles being unable to leave due to insufficient air circulation. The “canyon effect’ does not occur in Shatin, figure 2.

5 and 2.6 shows that the buildings in Shatin are often separated from the road through vegetation. The road in Shatin cannot be flanked by the building in the area that is only 3 or 4 floors tall. 


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