Inside an Egyptian Malqaf at +48°C (+118°F): Nobody Overheated

Inside an Egyptian Malqaf at +48°C (+118°F): Nobody Overheated It is three in the afternoon in Cairo, the air is +48°C (+118°F), and the north wind blowing across the rooftop feels like the breath of an oven. Then you drop one storey down — and the same wind arrives cool. No electricity. No machine. Just a scoop of mud on the roof. This is the malqaf: the Egyptian wind-catcher, built into desert houses three thousand years before air conditioning existed. In this episode we slice an Egyptian courtyard house open and trace a single breath of hot wind through the whole machine — the half-metre mud-brick walls that lag the heat to midnight, the mashrabiya screens that shade while they breathe, the sunken courtyard that traps the cold of night, the malqaf and the stack effect that move the air, and the chain of water — weeping zir jars, the marble salsabil, the fountain — that chills it on the way in. Six ideas, no moving parts, no power. The same answer the badgir of Persia and the barjeel of the Gulf arrived at, separately, against the same sun. They didn't fight the heat. They engineered around it. Subscribe for the engineering the modern world forgot.