What is the best Cooling system for an open area?

[marc400317]

Hello All,
I was asked to design a high end cooling system for an overhang connected to a palace. this Overhang structure is 40meters x 20meters and is open area from 3 sides and meant to provide shade at the building entrance. the temperature can reach 50 degc in the summer and it's a dry weather. One of the suggestions were to install a water mist cooling system.I am asking what is the best system for this application? Budget shouldn't be a limitation.
Thank You

 

[Compositepro]

Evaporative cooling is clearly the way to go. Misting is the simplest and least expensive. But misting can be messy and is strongly affected by the wind.

For a high end installation you could consider a cooling tower that could be made to look like bell tower or minaret. Spray large drops of water in at the top and let them fall into a basin at the bottom. The falling droplets will create a strong draft of cool air that exits at the bottom that is mist free.

The more conventional solution is to use blowers to draw air through a wet mesh.

 

[IRstuff]

I personally am not particularly fond of misters, although I appreciate their physical effects. I'd be most concerned about the pedigree of the water and whether it's been standing and whether it's been otherwise contaminated with bugs and microbes.

TTFN
faq731-376

 

[willard3]

+3 for IRstuff.

Water mists are a prime way to transmit legionella.

 

[KiwiMace]

Misting doesn't really work either, unless you are sitting right next to it. You could evap cool the air in an AHU and flood the area with cool air from displacement diffusers. This should keep the occupied space cool enough. Wind will prevent anything working beyond installing port-a-cool units pointing downwind. Aesthetics is probably key too I suppose.

 

[Drazen]

i do not know about any other system than evaporative cooling.

if you are working on middle east, still evaporative cooling will be pretty good because they have dry climate as far as I konow.

the real problem is when client insists on evaporative cooling in very humid climate, which gives messy results...

 

[marc400317]

The thing is that we have a limitted space at the back of the building. I would rather place a package unit at the back that might use the same space. Though routing a duct from the back of the building to the overhang structure would be messy and look obvious unless someone could advise a way to make it aesthetically acceptable.

 

[Drazen]

are we talking about the same system? for outside adiabatic cooling you need water spray network and water source, not AHU.

quite small plastic pipes are easily integrated within some canopy.

 

[marc400317]

there's no space for an evap cooler under the overhang it must be placed at the back of the building and ducting the flow all the way from the back to the overhang. The evap cooler air supply would reach a max temp of 28deg, add 2deg for ducting energy gain, you're somewhere in the 30degc. However if we place a dx package unit instead of the evap cooler, it will take the same space, no need for water supply, and you'll use smaller ducts as airflow for dx is smaller I guess.