TABLE OF CONTENTS - The Professional Green Building Council

Theme B: Creating a livable, healthy and environmentally viable citiesUnder these solar conditions, the irradiance that arrives at the outside surface ofexternal skin varied significantly. The variation is shown in Figure 4.Those two properties showed similar change patterns during the monitoring period.In morning, the irradiance reached the maximum value of 529.71 W/m 2 and startedto decrease as the sun move toward west through south.Starting from the condition when the sun was deviated toward east from exactsouth by 30.05, irradiance and illuminance in eastern side decreased significantly.On the contrary, the irradiance and illuminance on western side increaseddramatically.The maximum irradiance in eastern side was 64.68% of the irradiance in westernside. The difference between them was 289.18 W/m 2 . It appears that the influenceby direct solar radiation caused the result. The irradiance caused by the sun inwestern side was greater since it has the direct and diffused solar radiation. As thesun rises from east side, the direct solar radiation was strong factor that causestrong solar radiation in east, since diffused radiation from sky is not strong.However, the radiation in the west side has strong impact from direct sun andaccumulated diffused solar radiation from sky as the time period during which thesun was exposed to the earth increased. Hence, it is expected that greater coolingload will be caused in the western side of buildings.3.2 Temperature variation in cavityThe temperature in the cavity located in the eastern and western side showeddifferent variation pattern due to the variation of solar irradiance. The variation isshown in Figure 5-Figure 6. The cavity temperature in both east and west side hadsimilar variation pattern until the sun rise from east. During this period the lowesttemperature was 8.03 o C.In general, the cavity temperature in west side was greater than that in east side.The greatest temperature difference between the air inlet and outlet was 7.31 o C ineast side, and 12.82 o C in west side. It appears that this result occurred due to the542