I agree that the explanation given in the article seems wrong. I think the correct way to reason is to consider the building as whole as a system. There is pr

I agree that the explanation given in the article seems wrong. I think the correct way to reason is to consider the building as whole as a system. There is pressure difference between two sides of the building, one in the sun and one in the shade. It seems that jaali is best understood as air flow diffuser. It reduces the overall air velocity flowing trough the building and decreases the pressure. It's a good at mixing air, thus temperature behind jaali is lower but not as much lower as it would be with solid sun shade.