I'm doing a simulation (IES-VE) on using passive cooling strategies to lower indoor operative temperature for a double story house in Malaysia (tropical climate), But I'm facing a strange results.
I compared the operation temperature inside the house when the roof is extended by 0.6 m and by 1.2 m with the reference case (the normal roof without extension),
I found that when the roof is extended by 0.6 m, the indoor operative temperature was lower than the reference case
However, when I extended the roof by 1.2 m, the indoor operative temperature was higher that the 1st extension (0.6 m).
It is suppose to be decreased because the 2nd extension can provide more shading to the envelop of the building
the results and the pictures of the house with the 1st and 2nd extension are attached. wind direction diagram is also attached
hope to find an answer for that
thanks
If you're sure that you've done the modeling and simulation correctly, then there should be a bug in the program. Try contacting the developers or check their forum if someone else has already reported similar problem:
https://forums.iesve.com/
@Volodomyr Durmanov the effect of an indirect 2nd reflection doesn't seem to be greater than that of blocking direct solar radiation. Does it?!
In a hot-humid climate like that of your country, the passive cooling strategies don't focus on decreasing the indoor temperature through shading only. The shape and orientation of the building's mass can create better opportunities for natural ventilation - hence, natural cooling - for the building's envelope. From my point of view, you need to check the effect of the 120 cm overhang on the air movement around the building compared to the 60 cm one.
Indeed, I agree with colleagues who responded earlier. The thermal properties of the building material for the gable roof with 120 cm situation may have influenced the results and obstructed the effect of natural ventilation. Maybe you can try a shorter gable roof with a brise-soleil on the windows.
I believe the traditional Malay House managed to achieve a lower internal pressure by allowing opening on the leeward side of the building, that improved comfort. Ref: 'Building a Malay House' by Phillip Gibbs published by OUP if I recall correctly..
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