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Evaporative Cooling

Evaporative cooling is : - Lightweight, durable and non-toxic -Easy to activate and re-usable -Offers many hours of cooling relief and protection - Ce-mark certified -Cheap

Photo of oğulcan Mercan
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In order do cool protective equipment wee need;
-A cheap solution  to supply it many people 
-A solution which do not increase virus risk ( must not loose outside protection anytime. ( e.g. flowing cold air inside from  a  surface hole on wearing etc. )
-Must be portable.
-Must not cause extra energy consumption neither as electricty or as human effort (e.g carrying a cooler source)
-Must not slow down the user (e.g. with extra weight, connection to a cooler source etc.)

-Africa is hot
-Evaporation is endothermic (an endothermic process absorbs heat and cools the surroundings.)
-A layer of thin wearing is light, has no risk and does not restrict mobility 

Here is a simple solution:

-Simply dunk the item in water for approximately 1 - 2 minutes
-Gently squeeze out the excess water



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Photo of OpenIDEO

Hi Oğulcan! Thanks so much for joining the conversation with your amazing insights, expertise and passion. Congratulations on making our highlights list, we were really impressed by the potential your idea has to help rapidly equip care communities in the fight against Ebola and we hope that it will inspire the community to contribute more to the cause. Thank you!

Photo of Howard Boyle

Will humidity be created inside the PPE..? if the wet vest is worn under PPE..?

Photo of oğulcan Mercan

thanks for question. Lets Imagine you need to refresh humidity while working. Since you won't be able to take off PPE the vest must be worn over it. The trick is the contact part of PPE and vest. If it is not isolating coldness already it is enough. To increase affect may be more temperature conductive textile material be used on those parts.

Photo of Rainer Winkler

Hi, all. I agree, you have to wear it over the PPE. It should also be so tight that there are no or very thin air layers that block heat transfer from the skin.

The PPE material is not a problem, as there is a big area to be covered, it will block heat transfer only a bit.

Every cloth weared under it is a problem, so it should be minimized.

The effect should be best during daytime or in hot buildings, as the relative humidity is relatively low then. During the night when relative humidity approaches 100% it should be counter productive.

What I miss is a detailed analysis, because the heat transfer through this material is critical. It should be low.

I had only a short glance on the page of the producer. What I need are hard numbers on heat flow and heat conductance. The informations there are not specfic for users of a PPE that is impermeable to humidity and where cooling by evaporative clothing may be the only available cooling for the worker.

With kind regards, Rainer

Photo of oğulcan Mercan

Anything that increases the rate of evaporation of a system will make evaporative cooling more effective.

This includes:

Lowering ambient humidity
Decreasing atmospheric pressure
Increasing ambient temperature (though this one is obviously counterproductive)
Increasing surface area of evaporation
Choosing different evaporative media
Adding air movement/wind

This means we may have other options to cope with environment counter affects.
So it is true that relative humidity is important but it just decrease the affect will not prevent totaly.
It is known that one gram of evaporation of water decreases half celcius of one kg water. Vest is said to decrease 10 to 15 fahrenheight comparing to environment and it must be tested at high humidty also to see graph changing with humidity.