Building Technology
Thesis: Natural cooling
Hello friends!

I have opted for natural coolong of building as my thesis topic. And this element has to be implemented either in heritage centre or a memorial. Which one do you think is better to work it out. Can you please suggest me some pretty useful place that I can do as my case study?
Arun Kumar
Thesis: Natural cooling
Arun, What about the "wind towers" of Yazd in Iran? Plus, there has been mention of other similar examples either in India or Pakistan. :)))
Frank John Snelling
Thesis: Natural cooling

As Frank said, wind towers are good examples which are also found in Kashan, Tabas, and Dezful,in alternative forms.

Another Iranian element is the "khishkhan," or lantern, which can be found in the same cities (except Dezful). "Shavadan," or "cool underground," is another response to hotness, which uses earth's coolness, which you can find in Dezful.
Peiman Amini
Thesis: Natural cooling

Can you tell me more about Dezful? I have book "Living with the Desert" which is a study of ancient and traditional ways in Iran of working with the environment.

Offhand, I recall vertical windmills and an icehouse. From another source I know of the system known as "qanats" from Iran. Qanats being a series of airwells along an underground man-made watercourse in the desert.

The architect Hassan Fathy (of Egypt) mentions the use of unglazed "cooling waterjars" placed at opening in walls, so the temperature of the airflow through the openings is reduced and the air humidified or moistened. What I would call the original low tech form of air-conditioning.
Frank John Snelling
Thesis: Natural cooling
Shavadan (Shabestan) is the usual underground floor which has been used vastly in Iran. But it has a few differences from its desertly relatives:

- Some of them are level 7 meters below the courtyard.
- Some have small water amounts of water flowing through them.
- Some has windcatchers (often tower-like) which connect them to upper floors.

Because Dezful, unlike the desert city of Yazd, has a humid climate, evaporation wouldn't help cooling. Some windcatchers (not always tower-like) systems are used to force the underground cooled air to move through the indoors.

Shavadan (locally shwadun) is often accessed by the pool-free courtyard. In 40+ degrees C in the summer outdoors, the earth has a constant temperature about 24- degrees C. If it is connected to the upper floor, cool air will enter the upper indoors by means of wind suction. Today, most of the shavadans have been ruined or deserted. Once, there were more in other places like Shushtar and ruined Arjan.

In fact, the only difference between Dezful and Yazd in the use of wind catchers is the way the coolness is produced: in Yazd, evaporation is the main factor besides the earth temperature, while in Dezful the earth's low temperature is the basis for the system.

The modern system of cooling by using the earth's low temperature is driving several canals through the soil and using some fans for moving air through the canals and entering indoors.
Peiman Amini
Thesis: Natural cooling
Peiman, I have already tried three times to post a "thank you" to you and three times my post goes missing; so there must be a Gremlin in here. :)))
Frank John Snelling
Thesis: Natural cooling
Dr. Mehdi Bahadori has done conducted excellent research work on natural cooling. I've had the privilege of doing my research work under him at Arizona State University, Tempe, USA. You may do a search under his name to locate his research work. I've also been involved with natural/passive cooling in my profession as an architect.
Afzal Ebrahim


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