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  1. #1
    Join Date
    Jan 2019
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    Oklahoma
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    Chilled coveralls for attic work!

    I was thinking ice water, bird fountain pump, 18vdc-4ah battery, thermos(es), tubing glued to the inside of a pair or coveralls with a tube and tube heat exchange refrigeration circuit, such as the coo supply water meets the warm return water, keeping temperatures even.
    Upgrades include dry ice/alcohol sourced cooling, with alcohol/water refrigerant.
    Condensation?
    Mylar layer for outdoors?
    Let me know what you think, I'm trying it on the cheap. Have half of it already.

  2. #2
    Join Date
    Dec 2006
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    Vancouver, B.C.
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    Chilled coveralls for attic work!

    Quote Originally Posted by LandFish View Post
    I was thinking ice water, bird fountain pump, 18vdc-4ah battery, thermos(es), tubing glued to the inside of a pair or coveralls with a tube and tube heat exchange refrigeration circuit, such as the coo supply water meets the warm return water, keeping temperatures even.
    Upgrades include dry ice/alcohol
    sourced cooling,...

    I feel like alcohol has already been introduced...



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  4. #3
    Join Date
    May 2014
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    Just get a 'mining suit'. Read about them decades ago. High pressure compressed air. Just the change from high pressure to low pressure creates the refrigeration effect, with no change of state. Read about them decades ago.
    I do a triple evac with nitro to remove non condensables.

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  6. #4
    Join Date
    Dec 2006
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    Vancouver, B.C.
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    Honestly though, Im having a hard time visualizing what you are describing. Why the tube in tube HX? Im sure it would make more sense to me if you had a chicken scratch drawing to aid this discription, nothing fancy is necessary, just a scribble with your thoughts.

    When they came out with the electric heated jackets the first thought I had was does it cool also? The counter guy laughed at me and said no, its not a heat pump! I was honestly wondering if they used Peltier plates in the jacket. Im guessing because its a major corporation they were just looking for a quick buck in a simple idea and didnt want to tackle the inefficiency and complaints of low operational run times that would most likely coincide with peltier plates. I havent run the numbers to see how long it would work for but it may be something to consider also. Batteries are relatively cheep and Im sure you can buy the plates in bulk off Mouser for pretty cheep.


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  7. #5
    Join Date
    Dec 2006
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    Quote Originally Posted by BBeerme View Post
    Just get a 'mining suit'. Read about them decades ago. High pressure compressed air. Just the change from high pressure to low pressure creates the refrigeration effect, with no change of state. Read about them decades ago.
    Well that does seem like a pretty cheep option also.

    I gotta admit, whenever I go into an attic I always wonder how I can take LESS stuff up there with me, these suits and hoses and bottles seem like a bulky addition... I guess all great ideas start in the design stage then get refined to perfection after prototype has been confirmed successful.


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  8. #6
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    Dec 2006
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    Dry ice and thermoses....

    Ive put dry ice into pop bottles before, I would never strap that to my back though

    https://youtu.be/nZHGK37jBp8


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  10. #7
    Join Date
    Jan 2012
    Location
    Broomall, PA
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    Send the helper...?
    If I do a job in 30 minutes it's because I spent 30 years learning how to do that in 30 minutes. You owe me for the years, not the minutes.

  11. #8
    Join Date
    Jan 2019
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    Oklahoma
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    Thread Starter
    Quote Originally Posted by thatguy View Post
    Dry ice and thermoses....

    I’ve put dry ice into pop bottles before, I would never strap that to my back though

    https://youtu.be/nZHGK37jBp8


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    that thought had first occurred to me so, use a low temp/ alcohol capable pump. sublimate the dry ice in 100% rubbing alcohol (freezing point ~ -30f). All the CO2 is dispersed before hand and only ultra-low temp fluid is left. In turn the tubing size can be smaller.
    Think of higher voltage, less weight. More force amperage would be required.
    The prototype is a "simpler" version compatible with readily accessible ice machine at work. I figure it could keep a person pretty cool for a our or so with a gallon of ice in a 'cooler backpack.' Plus+ it holds colddrinks .

  12. #9
    Join Date
    May 2014
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    Be a real drag if the CO2 displaced too much oxygen, and you never make it out of an attic.
    I do a triple evac with nitro to remove non condensables.

  13. #10
    Join Date
    Aug 2002
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    Southold, NY
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    There already on the market.

    I wont use them......over 90 send someone else!

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  15. #11
    Join Date
    Nov 2006
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    SE Wisconsin
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    Instead of a thermos why not a Camelbak backpack?

    Then again, the extra weight you're carrying may offset the relief you might feel trying to stay cool.

    Just a thought and a penny in the pot.

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