Assignment 2 - MODELLING IN ECOTECT
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Figure 2: the annual sun path around the model
Analysis of solar radiation
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Incident solar radiation on the outdoor facades
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Figure 3: Incident solar radiation during the summer (average daily values)
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Figure 4: Incident solar radiation during the autumn (average daily values)
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Figure 5: Incident solar radiation during winter (average daily values)
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Figure 6: Incident solar radiation during spring (average daily values)
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Season
_Radiation (Wh/m²)_
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North facing facade
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East facing facade
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South facing facade
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West facing facade
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Summer
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Daily direct radiation
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0
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1640
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1640
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1199
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Daily diffuse radiation
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246
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1179
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1179
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1179
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Daily radiation
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246
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2819
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2819
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2378
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Autumn
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Daily direct radiation
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0
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482
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482
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341
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Daily diffuse radiation
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63
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303
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303
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303
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Daily radiation
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63
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785
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785
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644
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Winter
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Daily direct radiation
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0
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184
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184
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107
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Daily diffuse radiation
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19
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91
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91
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91
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Daily radiation
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19
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275
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275
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198
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Spring
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Daily direct radiation
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0
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1355
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1355
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1117
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Daily diffuse radiation
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173
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831
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831
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831
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Daily radiation
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173
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2186
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2186
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1948
Daily diffuse radiation{*}: East, South and West facing facades always absorb the same amount of daily diffuse radiation, while a North facing façade absorbs about 5 times less diffuse radiation. Summer is the period where the diffuse radiation is the highest: on average, 1179 Wh/m²* *_are soaked up by a South, East or West façade per day. The diffuse radiation is a bit lower in spring, with on average 831 Wh/m² absorbed by a S/E/W facing façade per day. It reduces even more in autumn, with average daily values of 303 Wh/m², and reaches the lowest point during the winter days, with only 91 Wh/m²._*
Daily direct radiation: East and South facing facades soak up the same amount of daily direct radiation. West facing facades absorb about 1,5 times less direct radiation than those two other oriented facades. Of course, there isn't any direct radiation going to the North facing facade. Here again, summer is the period where the direct radiation is the highest: on average 1640 Wh/m² are soaked up by a South or an East facing façade. This value reduces a bit during spring, where only 1355 Wh/m² are absorbed. Then, it reduces until 482 Wh/m² on average per day during the autumn, and reaches the lowest point during the winter days, with only 184 Wh/m².
We can notice that a façade absorbs more direct radiation than diffuse radiation, but the diffuse radiation isn't negligible at all, as it represents about 38% of the daily solar radiation.
Incident solar radiation on the floor
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Analysis of solar exposure of a shaded window
Average hourly solar exposure
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Single day solar exposure
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Average daily solar exposure
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Analysis of the daylight factor distribution in the room adjacent to the window with shading device
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The daylight analysis has been calculated with the following conditions:
- sky luminance: 2000 lux (peculiar to Trondheim weather)
- sky luminance distribution model : overcast sky conditions
- average window cleanliness
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