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Ask Slashdot: Large-Scale DIY Outdoor Cooling of Cairo's Tahrir Square?

timothy posted more than 3 years ago | from the squares-must-be-different-over-there dept.

Hardware Hacking 259

ClimateHacker writes "The struggle for freedom is still ongoing in Egypt and one of the many challenges that face the demonstrators in Tahrir Square is the sweltering heat. Skies are mostly clear and temperatures can reach up to 44 degrees Celsius (111 F) with hardly any shade. The risk of life-threatening heat stroke is quite real. I ask clever Slashdotters out there for novel DIY passive and active ambient cooling techniques. Perhaps some ideas could be a model for saving energy on cooling elsewhere."

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It's not difficult (5, Insightful)

ribuck (943217) | more than 3 years ago | (#36718062)

Making shade is the obvious solution. Anything from portable gazebos to improvised Berber tents to poles and shade-cloth. Shade is going to be more efficient than anything else at keeping people cooler.

If water can be spared, a fine mist of water in one part of the square would let people who have gotten too hot cool themselves down.

Re:It's not difficult (1)

Sique (173459) | more than 3 years ago | (#36718076)

That's why the oriental bazaar is either roofed or full of little stands with shade-cloth. And that's why oriental plazas often have small artificial creeks and lots of fountains - it's all for the cooling.

Re:It's not difficult (-1, Troll)

Anonymous Coward | more than 3 years ago | (#36718128)

Leave it to an Egyptian to ask for help when they've lived in the desert for thousands of years. Just tie ropes to the touts around the pyramids and to all the other con artists (wait, will there be any Egyptians left?) and attach them to spin a giant cooling fan. That will also make visiting Cairo a nice thing to do and maybe tourists will start coming back. As is, based on my previous experience with Cairo where every single person wanted my money, "oh well".

Walk into Israel and ask for a hand out. They get along well with their neighbors.

Summary of snobbery (3, Insightful)

Mathinker (909784) | more than 3 years ago | (#36718270)

And that's why the original question strikes me as stinking of colonialistic snobbery. OTOH, if some genius here can somehow, with only second- to third-hand knowledge of what kind of resources are really available and what conditions are really like over there, come up with a solution which will make their life easier, I'm all for it.

I'm not holding my breath.

Re:Summary of snobbery (2)

Joce640k (829181) | more than 3 years ago | (#36718468)

And that's why the original question strikes me as stinking of colonialistic snobbery.

We're going to tell desert people how to keep cool...!

How about some air conditioned shoes...

Re:It's not difficult (0)

Anonymous Coward | more than 3 years ago | (#36718086)

just as the metal used in freezer-cooler boxes absorb heat, and that I've seen that implemented for football players who play in the heat, this can be deployed as small units for public usage as supplemental cooling stations.

Re:It's not difficult (-1)

Joce640k (829181) | more than 3 years ago | (#36718326)

Making shade is the obvious solution.

Rly??? LOL!

PS: The correct response to a question like this is to mock the asker...

Re:It's not difficult (0)

Anonymous Coward | more than 3 years ago | (#36718376)

Nice. If the government doesn't turn off your water ''cause you might be helping the terrorists"
.

Re:It's not difficult (1)

MichaelSmith (789609) | more than 3 years ago | (#36718380)

Also use reflective fabric for the shade-cloth. Reflect sunlight back in to the air.

Re:It's not difficult (1)

Zzootnik (179922) | more than 3 years ago | (#36718484)

I looked thru the discussion and couldn't find this one elsewhere....
A Blimp. A Really Big, Shade Producing Blimp.
Or failing that, maybe some thousands of individual mylar balloons?
In either case, park them strategically, and should provide some shading for the square.

Re:It's not difficult (2)

nospam007 (722110) | more than 3 years ago | (#36718510)

For cooling, Misting Tents are better than simple tents.

http://www.bigfogg.com/product262.html [bigfogg.com]

Re:It's not difficult (1)

Skal Tura (595728) | more than 3 years ago | (#36718666)

with mist there might be temp cooling, but the problem is that it makes the air more humid, which makes it for more than the moment even worse.

overtime the surroundings will become more humid.

However it might work, as long as new air comes in which is not that humid. :)

Re:It's not difficult (1)

StripedCow (776465) | more than 3 years ago | (#36718532)

May I suggest to use tin-foil to reflect the light?

Reflected sunlight might be an effective demonstration tool.

Re:It's not difficult (0)

Anonymous Coward | more than 3 years ago | (#36718598)

Also, the tinfoil will be extremely effective to block the mind control rays the government may be employing.

Radiant barrier is what you seek (0)

Anonymous Coward | more than 3 years ago | (#36718618)

What you are looking for is called Radiant Barrier. If you feel like paying double or triple what the product is worth, visit your local big box hardware store. Otherwise hop on Ebay and buy a roll or two (usually 250' x 4') and use however is needed. Radiant barrier is strong - does not tear easily. Fully blocks all radiant heat.

Re:It's not difficult (1)

Skal Tura (595728) | more than 3 years ago | (#36718678)

cover the plaza with solar panels :D :D
Use the solar panel generated electricity half for ACs and whatever else is needed on the plaza, rest sold back to network ;)

Re:It's not difficult (1)

Xest (935314) | more than 3 years ago | (#36718636)

Mount some solar panels up high and use them to power cooled tents- shade from the panels, and cooling in the tents!

Re:It's not difficult (1)

hairyfeet (841228) | more than 3 years ago | (#36718654)

I would also add improvised camelbaks like those used by the US military would probably help. Dehydration in those temps is VERY real and VERY dangerous whereas a couple of two liters filled with water frozen the night before with a hose or surgical tubing would not only provide cooling as the ice melts but a source of fresh drinking water.

Evaporative cooling towers are standard .... (5, Informative)

tinkerghost (944862) | more than 3 years ago | (#36718064)

Pheonix Az & several other cities use tall evaporative towers to cool plazas -- pump water to the top & let it cascade down over tera-cotta tiles. The evaporation drops the air temperature and the cooler air combined with the dropping water forces the cooler air out the bottom of the tower.

Re:Evaporative cooling towers are standard .... (2)

CrazyDuke (529195) | more than 3 years ago | (#36718138)

Assuming the need for a temporary setup, the park is only about 2 blocks away from the Nile River. It should be possible to use a pump truck or something to pump the water in. There are some things to look out for, though. For instance, the smell of raw river water, blocking city streets with the temporary line, and the political football it gives to any opposition if (even decommissioned) fire-fighting equipment is used for a political event. E.G. politicians in the US will take emergency equipment out of service during a disaster to use as a photo opportunity instead to generate publicity and fake "leadership" imagery.

Re:Evaporative cooling towers are standard .... (-1)

Anonymous Coward | more than 3 years ago | (#36718364)

Damn commies gotta turn everything possible into hate-speech.

Re:Evaporative cooling towers are standard .... (5, Informative)

Anonymous Coward | more than 3 years ago | (#36718308)

A tall tower open at the bottom to the square and at the top can be made to generate a significant up-draft of air, cooling the street-level. The top of the tower needs to heat up in sunlight to generate the up-draft. This system exists in a number of mosques and old, traditional buildings in Egypt to cool the street-level covered walkways. You need to have a tall building with a stair-well or similar open tower at the down-wind end of the square, and to cover the area leading up to the tower.

All shade and covers should be removed at night to maximise the cooling of the earth, and re-covered when earth has stopped cooling - this can actually be quite late, when the sun is low, and does not mean getting up in the early dawn.

Evaporative cooling, like the bush-air-conditioner, can be used if the local humidity is low. Wet the shading fabric and it will cool with evaporation. It becomes unpleasant as the local humidity rises, so use the minimum water to keep the fabric damp and no water if the fabric stays damp.

Re:Evaporative cooling towers are standard .... (0)

Joce640k (829181) | more than 3 years ago | (#36718478)

Let's build tall towers, yay!

Tarp. (0, Troll)

the_raptor (652941) | more than 3 years ago | (#36718070)

Get a tarp.
Get some poles.
Profit.

Which is what I saw the protesters doing months ago. You get some shade, drink lots of water, and avoid heavy exertion. Basic hot weather protocol, which is all those protesters are going to bother to do. This isn't fucking rocket science, but this is one of the most retarded Ask Slashdots I have ever read.

Why the fuck does your Western arse think it is smarter then the people who have lived in those climates for at least the past thousand years?

Re:Tarp. (1, Funny)

Anonymous Coward | more than 3 years ago | (#36718112)

Why the fuck does your Western arse think it is smarter then the people who have lived in those climates for at least the past thousand years?

Because we have air conditioning, internet and Haagen-Daaz and they still live on dirt floors kissing their cousins' camel?

Re:Tarp. (1)

Joce640k (829181) | more than 3 years ago | (#36718296)

Hand out some umbrellas, aka "parasols".

Para = stop
Sol = sun
Parasol = Sunstopper

While we're having a Spanish lesson, sombra=shadow and from that we get the word for hat: Sombrero ("shade maker") - hand out some wide brimmed hats.

Maybe some fans as well ... you know, the all the things people used to use before remote controls became a substitute for thinking.

Re:Tarp. (-1)

Anonymous Coward | more than 3 years ago | (#36718466)

"...Sombrero ..."

Let them also sing La Cucaracha and the protest will look like a Mariachi Convention.

Re:Tarp. (0)

Joce640k (829181) | more than 3 years ago | (#36718536)

My bad, I forgot "Spanish" is a synonym for "Stereotype Mexican" over there...

Sombrero just means 'hat', not necessarily the Mariachi type.

Doesn't change the fact that they're fscking Egyptians and have over 3000 years of experience dealing with sunlight. I'm not sure a bunch of orange-fingered basement dwellers can teach them much. If you want to help, send money to the people who are taking them food and water.

Re:Tarp. (0)

Anonymous Coward | more than 3 years ago | (#36718504)

And "umbrella" itself comes from "umbra" = shadow

Re:Tarp. (1)

Magic5Ball (188725) | more than 3 years ago | (#36718354)

It's a legitimate question, and 10 hours at slashdot saves an hour creeping @sandmonkey or @telecomix or any of the other places where this has been discussed, or an hour at the library.

Also, I concur with Mathinker at (#36718270) [slashdot.org]

Shade (1)

c0lo (1497653) | more than 3 years ago | (#36718082)

The shade of a tent cooled by Peltier elements powered by the PV panels on top of the tent. No moving parts.

Water will help as well... drink it plenty.

Re:Shade (2)

the_olo (160789) | more than 3 years ago | (#36718142)

Wouldn't that add to the heat? The waste heat transported by Peltier elements needs to be moved somewhere else, otherwise you'll just get more heat stemming from the thermodynamic inefficiency of the process.

Sure, the hot air might rise upwards and the tents might gain some cooling from such a setup, but I think this needs testing in real life in order to determine whether the real effect will be that of cooling, or warming.

Re:Shade (1)

Joce640k (829181) | more than 3 years ago | (#36718304)

You are correct...you could maybe spray the tents with water but the increased humidity in the plaza might be more uncomfortable than the heat.

Re:Shade (1)

c0lo (1497653) | more than 3 years ago | (#36718388)

Mount the Peltier elements outside the tent, with the cold side on the tent canvas (wasn't it evident?). Have the canvas wet to have a better heat conductivity.

Re:Shade (1)

the_olo (160789) | more than 3 years ago | (#36718404)

Yes, that's obvious, but what do you do about the unmanageably hot sides of the elements that hang outside the tents? They will emit heat into the air, the air will circulate and reheat the surroundings and possibly the insides of the tents... What about people who travel between the tents?

Re:Shade (1)

c0lo (1497653) | more than 3 years ago | (#36718438)

I'm betting at a max to a 30 centigrade between the hot and cold side. Say a 25-27C on cold to a 55-57C the hot side - not that hot to burn one when briefly touched.
In regards with the increased temperature outside - that's an opened system, with the convection eliminating most of it. Anyway, the balance of incoming energy is the same: the Peltiers are powered by PV-es, this the total heat eliminated cannot be higher than the incoming solar radiation.

Re:Shade (1)

Joce640k (829181) | more than 3 years ago | (#36718694)

Yes, that's obvious, but what do you do about the unmanageably hot sides of the elements that hang outside the tents?

They could be cooled using Peltier elements.

Re:Shade (1)

the_olo (160789) | more than 3 years ago | (#36718416)

You need to solve the problem of transporting the heat away, otherwise you're doing a thing that amounts to (pardon my French) shitting next to your dining table.

Re:Shade (1)

c0lo (1497653) | more than 3 years ago | (#36718462)

Convection - it's not like the heat extracted from the tent will start forming some kind of ponds outside, is it?

Now, look, I know what I'm saying is sound from the physics perspective. I also know that the problem is the cost (for the PV mainly), this is what it makes the solution impractical.

Re:Shade (1)

mdsolar (1045926) | more than 3 years ago | (#36718714)

No. The only extra heat would be owing to a change in albedo from the solar panels. Enhanced convection outside the tent should more than compensate that. You can't add more energy than is already entering the system with solar. you are just making use of the low entropy of few photons as it converts to higher entropy of many photons (of lower individual energy). The energy stays the same and the entropy conversion would happen anyway without the PV. You would get net heating if you used grid power since then you would be bringing energy in that was not already coming in anyway.

Re:Shade (1)

Kagetsuki (1620613) | more than 3 years ago | (#36718150)

Peltier elements are not only expensive, but not very effective at cooling areas. If you had an array of PV panels you'd be better off having them power fans.

Of course if you had unlimited resources or knew of where to get unbelievably cheap PV panels and massive and amazingly efficient and large Peltier elements a PV array roof with a Peltier cooled floor in the middle of an area like this would be pretty awesome. It's a shame it's probably economically impossible.

Re:Shade (1)

c0lo (1497653) | more than 3 years ago | (#36718408)

Peltier elements are not only expensive, but not very effective at cooling areas.

Not [ebay.com] that expensive (certainly lot less expensive than the PV - I reckon these are the bottleneck).
It is going to be expensive anyway - you are fighting 1kW/sqm incoming flux, with an outdoor temperature that makes a heat transfer against entropy a pain - with water not quite easily spared.

Re:Shade (1)

the_olo (160789) | more than 3 years ago | (#36718294)

Wouldn't that only add to the heat present in the system? Unless you solve the problem of moving the waste heat somewhere away from the place, you'll just introduce more heat produced by thermodynamic inefficiencies of the process involving transport of heat using Peltier elements - the laws of thermodynamics [wikipedia.org] , especially the first one, are ruthless.

True, the air heated by radiators attached to Peltier elements might get hot enough to raise upwards and travel away from the camp, but you'd need to perform real world tests to really know whether the effect that you achieve would be that of cooling, or warming.

Ask a silly question (0)

Hognoxious (631665) | more than 3 years ago | (#36718090)

Wear long, loose white clothes. Place a towel or something similar on/around your head, sort of like a hood.

I've heard that they do this with great success in some countries.

Re:Ask a silly question (1)

ShakaUVM (157947) | more than 3 years ago | (#36718220)

>>Wear long, loose white clothes.

Or black clothes, like the Bedouins:
http://www.nature.com/nature/journal/v283/n5745/abs/283373a0.html [nature.com]

Seriously, this entire Ask Slashdot is just hilarious to me. Our collective fat asses are supposed to tell desert natives how to keep cool and hydrated? Heh.

Re:Ask a silly question (0)

Anonymous Coward | more than 3 years ago | (#36718358)

Desert natives in Cairo? Really?

Re:Ask a silly question (0)

Anonymous Coward | more than 3 years ago | (#36718384)

You assume that there aren't any desert natives reading slashdot.

people power (0)

Anonymous Coward | more than 3 years ago | (#36718094)

The only cool and innovative thing I think would work is setting up a piezoelectric floor to power some mist fans. Otherwise, just get out of the farking sun and put up some shade.

Simple Distributed Cooling System (0)

Anonymous Coward | more than 3 years ago | (#36718108)

How about each person bringing in a small circular tub (1ft dia) that has 5ltrs of water and keeping it near to him/her.

Watercooling (2)

SharpFang (651121) | more than 3 years ago | (#36718132)

Water evaporating from clothes. Arrange for fire service to spray people with water from the trucks. This is quite common in outdoor festivals - the car moving very slowly through the crowd, and firemen pouring a mist of water over the crowd. This suffices for a hour or so, can be repeated as needed. Also, if anyone faints, or feels otherwise ill, they can be handed over to the fire truck to be taken out to a medical station..

Otherwise, if you can't get cars, just get a bottle of water for yourself and pour it over yourself from time to time.

Re:Watercooling (1)

drinkypoo (153816) | more than 3 years ago | (#36718662)

Here you go! This is the ONLY realistic solution. Keep everyone wet. You're not going to be able to put shade up and keep it up in a space you don't really control.

Duh... (0)

Anonymous Coward | more than 3 years ago | (#36718136)

Scantily clad women with large fans (to fuel the fervor for women's rights, while cooling everyone off, of course.)

Get a job in an air conditioned office (3, Funny)

Rogerborg (306625) | more than 3 years ago | (#36718148)

And be part of the solution, you lazy smelly hippies.

Glas, cooled water (1)

ZeroExistenZ (721849) | more than 3 years ago | (#36718152)

I recently saw this and think it might work if you're looking for a more complex solution as all the obvious:

Have water run over a thin plate of some sort (glass is more aestethical pleasing) and have a stream of cold water run over it while your container or source of water is cooled. (your container before repumps the water fe.)

In these temperatures, place de device preferably in a enclosed improvised portable room (aka "tent").

The result should be a pleasing soothing sound of water, in cooled down high humidity where you can optionally get funky with a nice beer while you're protesting.

The obvious solution (2)

kubajz (964091) | more than 3 years ago | (#36718156)

Let's see... something that reflects heat, and has other possible benefits against an abusive government... hmmmm...

Have you considered a tinfoil hat [wikipedia.org] ?

Giant inflatable dome! (0)

Anonymous Coward | more than 3 years ago | (#36718212)

with air conditioners!

A wet towel around the neck (2)

wrwetzel (543389) | more than 3 years ago | (#36718224)

A wet towel around the neck is an efficient way to stay cool. The evaporating water cools the towel and the adjacent arteries and veins going between the brain and torso. Bill

Simple and effective, white sheets (0)

Anonymous Coward | more than 3 years ago | (#36718234)

I have seen two layers of shade work very well. The first layer absorbs the sunlight and the second layer spaced apart beneath creates a draft between the two layers which isolates the people below from the upper hot shaded material. White is much better at reflecting heat, dark colours absorb heat. Fans or moving air is more practical than cooling. So two white sheets spaced 50cm apart would be best. Keep the sheets as high up as possible.

Solar Updraft? (1)

imunfair (877689) | more than 3 years ago | (#36718242)

Obviously not a DIY solution - but I was wondering if a government wanting to do this on a large scale could actually use a solar updraft tower type design directly above the area that would suck hot air out and bring in a breeze and and (hopefully) cooler air from the surrounding vicinity. Bonus: you get power from it as well

http://en.wikipedia.org/wiki/Solar_updraft_tower [wikipedia.org]
http://science.slashdot.org/story/01/12/10/0610203/Thermal-Solar-Plant-To-Be-Erected-In-Australia [slashdot.org]

Thats hot? (0)

Anonymous Coward | more than 3 years ago | (#36718252)

Come live in Darwin, Australia where the temp gets as high as 40c with 100% humidity!!!.... Harden the f%$k up!! lol......

Ridiculous troll (0)

slasho81 (455509) | more than 3 years ago | (#36718268)

This sounds completely like a troll. First, the weather in Cairo is hot, but not 44 degrees C hot. Second, people do not hold prolonged protests in Tahrir nowadays. Third, protesting isn't supposed to be an easy activity. You're not guaranteed certain conditions like you're in a freaking office. Forth, any real protestor would worry about tear-gas and batons way more than they would about the heat.

Re:Ridiculous troll (4, Informative)

johndmartiniii (1213700) | more than 3 years ago | (#36718490)

This is not a troll. Or if he is, he has is head unwittingly in the right place.

There have been protests again in Tahrir for about a week. They ramped up on Friday and haven't really abated since. They also regularly happen on Fridays. The Egyptian army have been hesitant to use force again after a few recent incidents which got entirely out of hand. Here's a link to a local English translation daily on the protests this past weekend: http://www.almasryalyoum.com/en/node/475123 [almasryalyoum.com] .

It is not unreasonable for protesters in Cairo to be concerned about this sort of thing at all. The biggest protests happened in the middle of the winter when cold is a serious issue, particularly at night. Up until the beginning of July the weather has been quite mild, but just this week we have had two 40+C days. Yesterday was still stifling at 38C. Today is a breath of fresh air (sort of) at 32C, but it is always about 4-6 degrees hotter downtown, even with the river right there. It can be terribly dangerous. It's easy to get dehydrated or to develop heat/sun stroke rapidly without realizing it.

Misters (0)

Anonymous Coward | more than 3 years ago | (#36718272)

simple : use misters .Water comes in , goes through nozzles to make tiny droplets , then the fan pushes the air and moisture.
These devices have been in use in large spaces in Florida for years.Keep a place cool ? Use a mister.
Even available as rentals 8)

FTB

Just do your usual thing (0, Troll)

dmesg0 (1342071) | more than 3 years ago | (#36718276)

Blame Israel for the heat as well. You'll feel much better immediately.

Re:Just do your usual thing (0, Offtopic)

Sulphur (1548251) | more than 3 years ago | (#36718310)

Blame Israel for the heat as well. You'll feel much better immediately.

Israel planted enough trees that it changed the climate.

Re:Just do your usual thing (1)

chomsky68 (1719996) | more than 3 years ago | (#36718454)

Israel planted enough trees that it changed the climate.

By sucking the Dead Sea dry and causing an environmental catastrophe.

Re:Just do your usual thing (0)

Anonymous Coward | more than 3 years ago | (#36718494)

I didn't know that they already had salt sucking genetic modified trees.

They don't stop to amaze me.

Re:Just do your usual thing (1)

dunkelfalke (91624) | more than 3 years ago | (#36718572)

There are plants that do just that - for example mangrove.

Water. Lots and Lots. (2)

Jeremy Lee (9313) | more than 3 years ago | (#36718284)

Spray a firehose upwards through something that will make a fine mist. Most will evaporate, sucking vast amounts of heat out of the air, which will flow downwards onto the crowd, along with the remaining chilled water. You want pressure rather than sheer volume.

Burlap/canvas tents can be cooled with a constant trickle over them in the same way.

Slightly less messy might be a series of hoses that carry chilled water from a tank out to modified hot-water-bottles strapped to people, and then away again, maybe even back to the tank to close the system. Rip a few fridges apart and put the cooling pipes in the tank. Run any waste water over the hotside pipes and then into the drains.

It's like CPU cooling, just on a larger scale: :-)

Re:Water. Lots and Lots. (1)

Jeremy Lee (9313) | more than 3 years ago | (#36718318)

For extra effect, put the burlap tents under the firehose spray, and try to get the mist to block the sun. (Small artificial clouds.)

Synthetic Cooling Towel Equivalent and Water (1)

amanicdroid (1822516) | more than 3 years ago | (#36718298)

I realize the initial request was for large scale cooling options but an affordable equivalent to synthetic cooling towels would help drastically. Draped over the neck, the towels take advantage of evaporative cooling.

Sadly with the lack of foresight there's probably not enough time to organize sponsorship from one of the multiple companies competing for market dominance but I'm sure our resourceful /.ers can recommend an equivalent like say a damp cotton/polyester blend rag.

My suggestion (1)

benjamindees (441808) | more than 3 years ago | (#36718302)

After consulting Google maps and images, I see the environment is roughly:

1) Flat terrain, near the Nile river
2) Mostly concrete
3) Standing-room only

So I would say the solution would mostly comprise

1) Shade,
2) Drinking lots of water, and
3) Air flow

Setting up awnings shouldn't be too difficult. It should be possible to filter, bottle and chill water on site. Procuring some large fans and some type of power supply should be possible as well.

Just asking (0)

Anonymous Coward | more than 3 years ago | (#36718314)

Why is the square a circle?

Re:Just asking (0)

Anonymous Coward | more than 3 years ago | (#36718360)

Same reason a boxing ring is rectangular I'd expect.

Easy. (0)

Anonymous Coward | more than 3 years ago | (#36718446)

It's a squared circle.

Wet down the pavement (1)

mattr (78516) | more than 3 years ago | (#36718322)

In addition to the above posts about reflecting away heat from above, may I suggest you wet down the pavement in advance.
This will reduce the heat coming from the hot pavement below which may otherwise reach dangerous temperatures.
 

Re:Wet down the pavement (1)

kvvbassboy (2010962) | more than 3 years ago | (#36718570)

Heh.. I come from an equally hot place, where it is hard to stand out for more than 5 or 10 minutes, let alone the whole day. The problem with wetting down the pavement is that the water evaporates literally in 10 minutes (since it is water spread over a large area). I don't know if they can spare enough man power to keep repeating this process.

Like other posters said, the only feasible option is constructing a shade preferably with a very good reflective material. Drink water and yoghurt to keep yourself refreshed.

Re:Wet down the pavement (1)

Jeremy Lee (9313) | more than 3 years ago | (#36718590)

Except in the short-term it acts like a sauna, transmitting the trapped heat in the pavement into hot saturated air.

For outdoor cooling... (1)

crow_t_robot (528562) | more than 3 years ago | (#36718346)

Burn hydrocarbons. Lots of them.

Love,
The real "ClimateHacker."

Universal studio (1)

jellomizer (103300) | more than 3 years ago | (#36718362)

A couple years ago I was at universal studios in August (a hot time to be in Florida) what they had was a kiosk of misting stations just some pipes pumping a fine mist of water to a group of 10 people at a time. For about a minute in those you feel better for about 15 minutes. But you could store a large tub of water and a gas pump and place these at key locations. After you are done you take it apart and pack it away.

Uhmm... (0)

Anonymous Coward | more than 3 years ago | (#36718370)

Are you seriously trying to suggest DIY temperature cooling techniques to people who have been living in the desert for mileniums?
This is hilarious... Or else, really really condescendent, almost racist.

Re:Uhmm... (1)

Anonymous Coward | more than 3 years ago | (#36718406)

It is condescendent, but not racist. It would be more racist to assume "all those desert people" don't need any advice about cooling techniques because surviving in the heat should practically be in their blood.

Re:Uhmm... (1)

Lennie (16154) | more than 3 years ago | (#36718452)

Sounds really strange to me too.

Maybe the young city people are out of touch with their roots ? ;-)

International Aid (1)

TheRaven64 (641858) | more than 3 years ago | (#36718378)

Ask the RAF to fly them over some British weather. We'd be happy to spare it, really!

Re:International Aid (0)

benjamindees (441808) | more than 3 years ago | (#36718402)

Unfortunately it's a package deal and also comes with British teeth.

Vegitation (2)

MichaelSmith (789609) | more than 3 years ago | (#36718396)

A couple of years ago in Penang I took a tour of the botanical gardens. A short section of the tour took us through a stretch of native forest. The microclimate in the forest was much more comfortable than other areas. So break up the concrete and replace it with trees. I know this may not sound very feasible in the short term but it is the only way to beat the climate in the long term.

You're kidding (1)

EEDAm (808004) | more than 3 years ago | (#36718512)

You have got to be kidding me. You seriously thing anyone on Slashdot has anything to teach the people of Egypt anything about how to stay cool in the heat, in a civilisation that has been running countless generations of agrarian workers out in the fields on the Nile delta for ten / twelve hour days for oooohh, over ('scuse me) FIVE THOUSAND (ahem) years and the millions of city dwellers who also make their livelihoods substantially outdoors? Either this is an epic troll or epically short of self-awareness.

Re:You're kidding (1)

kvvbassboy (2010962) | more than 3 years ago | (#36718612)

Not really. You would be surprised at how insufficient many of the ideas are. Add this to the fact that the majority of the people these days are used to the indoor environment, and are no longer agrarian workers slogging out in the sun. New thoughts and ideas are always welcome.

Re:You're kidding (1)

Jeremy Lee (9313) | more than 3 years ago | (#36718652)

Well, I'm Australian. We have heat and deserts too, you know. Not everyone here is from Minnesota or Canada.

Yes, it's a long shot. Most of the solutions will be obvious repetitions, which alone can be reaffirming, but we live in hope that one person out there has solved this so thoroughly and elegantly that we will be amazed by their ingenious solution.

People have made excimer lasers from tinfoil and air. I know one guy who invented a nanopore water filter that removes 99.99% of contaminants and is made from mud, coffee grounds, and a cow turd.

[OT a tiny bit] -Tel aviv, Bangalore removed trees (4, Interesting)

lkcl (517947) | more than 3 years ago | (#36718550)

slighly off-topic: two major cities - tel aviv and bangalore - cut down large numbers of trees in order to make room for more people. the immediate result was a rise of 10 Centigrade in bangalore (from 45C to 55C). in tel aviv's case, not only did the temperatures rise but also migrating birds no longer have a stop-over point half way along their route between the two hemispheres.

not that planting some saplings in a public place is going to help in the immediate short-term, i appreciate...

Direct ingestion of ice (1)

Kludge (13653) | more than 3 years ago | (#36718566)

The most energy efficient way to cool people is to pour ice directly into them. Give each person an styrofoam cup of crushed ice to eat. The low temperature of the ice plus the heat of fusion will pull a lot of heat.

Re:Direct ingestion of ice (1)

benjamindees (441808) | more than 3 years ago | (#36718628)

The most energy efficient way to cool people is to pour ice directly into them.

Only if you ignore the energy required to produce the ice.

I don't understand (0)

Anonymous Coward | more than 3 years ago | (#36718568)

What does this story have to do with bitcoin? :)

Refreshing! (1)

Giovanny (2273376) | more than 3 years ago | (#36718602)

I would strongly suggest the use of water-cannons. Not only would water-cannons control protestors but they would also keep them refreshed and cool during their protests!

tap the cool Earth & water underground (0)

Anonymous Coward | more than 3 years ago | (#36718606)

As above, shade, water mist, & vegetation are options, however in the desert water is in short supply (that's why it's call desert, duh :)) Capture the wind as some house architecture in the region does. Dig down several feet, there is ample cool water there, and, the temperature is MUCH cooler. Use windmill for power.

Space blanket awning and beach umbrellas (1)

AC-x (735297) | more than 3 years ago | (#36718614)

I'd suggest anything that can create shade, either making some space blanket [wikipedia.org] awning (something like this perhaps [setsail.com] ) or try to get hold of cheap beach umbrellas.

The umbrellas can also be painted with slogans etc.

2 Layer Shade (0)

Anonymous Coward | more than 3 years ago | (#36718692)

2 layer shade.

Basically 2 suspended layers with an air gap in the middle.
Top layer blocks sun, but absorbs some heat, which is radiated in all directions, including downwards.
second layer easily blocks this radiated heat and air currents remove the heat from the layer of air inbetween.

I read about it when going to camp in Hungary (35C) and wanted to be able to sleep in my tent after sunrise.
Anyway, it works very well and apparently is used to great effect at the burning man festival (which is in the desert)

I used Ropes, Tarp, Poles and Pegs.

J.

water cannon (0)

Anonymous Coward | more than 3 years ago | (#36718696)

water cannon

WEll let's see.. (2)

Lumpy (12016) | more than 3 years ago | (#36718702)

The following is what I have done at Burning Man festivals in the past.

1 - space blanket.... Yes a space blanket. they reflect 98% of Infrared and visible light. it makes a HUGE difference in the desert heat.
2 - water soaked white neck wrap. The evaporation effect of that wet cloth around my neck makes a GIANT difference in low humidity.
3 - water soaked white turban. Again.. Evaporation is your friend.
4 - white umbrella..... seeing a trend here? if you are in bright sun the best thing you can do is reflect as much of it's energy away from you as possible.
5 - wet clothing.. Again white, again wet.... isn't physics neat!

The biggest problem is pesky deserts dont have a constant supply of water. Someone needs to complain to the planet engineers about this oversight.
What I have discovered is that most people that live in those regions already know how to keep cool. It's the idiot Americans that cant understand why people don't die instantly when they dont have AC in their cars or homes that cant figure out how to stay cool outside.

Actually that was unfair. It's pretty much any Idiot that is lacking in education and lives in a 1st world society no mater what the country.

And yes, I am an American... Most of us really are pretty stupid when it comes to common sense and life skills.

An easy solution (0)

Anonymous Coward | more than 3 years ago | (#36718710)

Move demonstrations here [wikipedia.org] . It is a cooler place, and given how things are going on in Egypt after Mubarak fall, I don't think the world will ever notice a difference.

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