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Ancient Iranian Air Conditioning
(lemmy.world)
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this post was submitted on 24 Jul 2023
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This works fine in low humidity environments (deserts), but not in humid environments where the water cannot evaporate to absorb heat from air. And humid, hot environments are the most dangerous (see wet bulb temperature).
There are plenty of tutorials that explain and teach to build a swamp cooler—basically, all you need is a bucket with lid, a fan, wadding and water.
When a wind tower is integrated with a quanat system, it works even in humid.
The key is drawing in air through underground passages - either irrigation channels or just cellars. The ground acts as a cold store (heat sink), cooling incoming air before it enters the house.
The tower + wind catcher has no thermal role - it must simply create low pressure and keep the draft going.
Then it's not really a swamp cooler, but using the soil/rock as a giant heatsink to conduct heat from the air. That heat of course will warm up the rock over time reducing efficiency, but this could be countered by letting water flow through these channels. Giving a hybrid between evaporative/swamp cooling and heatsink. I'm sure some physicist who knows thermodynamics could elaborate further how well such a system would work.
Correct. The ground is a MASSIVE heat sink, but can only absorb and transmit heat so quickly (how much thermal conductivity it has; just the mathematical reciprocal of insulation/resistance). Having a large contact area and/or water helps a lot. If you can get down to the ground's natural/ambient water table, it'll conduct a lot better than dry dirt and rock (not to mention that evaporation can help with sufficient air flow).
If you make use of flowing water, probably it's just going to be a matter of the temperature of the source of water, as it'll likely eclipse (depending on rate and volume of flow) what gets absorbed by the ground. Unless it's a closed loop, in which case you're essentially just increasing the surface area of ground you're transmitting to (and you'll need to take advantage of convective flows like with the air, or you'll have to actively pump to keep the flow going).