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There are 2 main principles:
1. cooling solution must be TARGETED AT NATURAL COOLING SPOTS on the human body (why waste energy cooling the hole costume/body when you can cool several spots and make the body FEEL cool. And workers stay more in costum

There are 2 main principles: 1. cooling solution must be TARGETED AT NATURAL COOLING SPOTS on the human body (why waste energy cooling the hole costume/body when you can cool several spots and make the body FEEL cool. And workers stay more in costum

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yes! if they put it on the INSIDE of the suit.

Hi Justin,
First of all: you are right, combining sodium hypochlorite (bleach) with ammonium nitrate/ureea can lead to toxic fumes and even explosions - which is not what we want.
That's why i suggested the packs to be worn inside the suits (so no contact with infected areas or disinfectants); they would be properly disposed separately.

Second: if you lower the amount of active substance to medium should "increase" the actual end temperature of the cold packs (and/or add a protective layer between the pack and the skin; like your clothes :) ) temperature should not drop so low so vasoconstriction should not be an issue
Also made some improvement suggestions for the cold packs of the futiure in a comment on my idea - on the purpose of avoiding ice burns; same could be applied to avoid vasoconstriction

Also note that on the purpose of just recharging your clothes with endothermic reactions there are several other materials/reactions that can be used

I suggested the existing ice packs because they are already here + components are cheap + all the waste can be used / recycled.

Other reactions could have components & waste that are safe to use with bleach - but they are not readily available; need money and time to develop and study the consequences and may need extra waste disposal measures. The components are more costly; etc.

They are possibilities for improvement the future (1-2 years from now maybe)
but for the crisis that is now we should work with something we can use now.

Hi Deborah,
I will answer below:
1. a. you can incorporate the cold packs into newly designed suits by making pockets on the INSIDE (= no contamination) - and put an elastic band or laces to make it stick to the skin for cold transfer; or people just press them from time to time on the skin.
1.b. in the existing suits (that don't have special pockets) - you can use duct tape on the margins of the packs to stick it to the suits (duct tape is cheap and easy to use and transport; if is made of paper = also recyclable/biodegradable; or can be burned after use without releasing any chemicals)
They will be taken off the suite after the suite is taken off the person, so they will never be in contact with the contaminated area.

2. Several cold packs are made to be applied directly on the skin & prevent cold burns from the factory; the "coldness" can be easily adapted by the factory by simply putting less or more active substance when they are made. Also there can be a protective layer of clothes between the pack and the skin; cold burns will never be an issue - if correctly used

3. Size of the packs can also be easily adjusted from the factory, along with the coldness. They are very low tech (small bag with active substance inside a bigger bag with water) and the size of the bags can be easily adjusted - if big enough quantities are ordered to be worth it

3.b. Also there can be made improved ones witch can be activated several times (several small bags with active substance inside instead of a big one; think bubble wrap with active substance inside) = small bursts of coldness when you want them instead of a bigger one

4. i don't have access to a PPE suite or INSTANT COLD PACKS since i'm not in the medical industry - but i will try to make some pictures by using regular packs put inside regular clothes - so people can understand it better.
If anyone has access to the supplies needed - they are most welcomed if they can work on it and adapting it to show a prototype of the real thing.
It would only take 10 minutes to fit several packs inside a suit with duct tape.