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/sci/ - Science & Math


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1896780 No.1896780 [Reply] [Original] [archived.moe]
Quoted by: >>1896851

So ima thinking earth is hot and some people need to work outside so why not have liquid cooled cloths like astronauts have. What do you think would have more cooling capacity, 5lbs of watter ice melting, dry ice sublimating, or liquid nitrogen boiling?

>> No.1896807
Quoted by: >>1896844

Or.. you can just get used to the heat. I used to think the average 101F in Arizona phoenix was bad, but now I don't even notice.

>> No.1896844
Quoted by: >>1896866

>>1896807
and were you digging ditch or paving roads?

If we produce a viable product someone will buy it to improve productivity or something, perhaps after a few years osha will require it like all the other safety shit. I'm thinking if you can keep someone cool for two hours then load in fresh coolant you would have a successful product.

>> No.1896851
Quoted by: >>1896876 >>1897038

>>OP
Water ice melting. The heat capacity of water is insane.

Ice 38.09 J/(mol K)
Water 75.327 J/(mol K)
CO2 36.94 J/(mol K)
Nitrogen 29.12 J/(mol K)

>> No.1896860
Quoted by: >>1896869

Imagine how difficult it would be to do manual labor in a space suit.

>> No.1896866

>>1896844
Well I won't deny it'd save on having to drink so much water here to deal with sweating a ton.

>> No.1896869

>>1896860
I would rage if they made me wear it. I have trouble wearing anything but pants.

>> No.1896871
Quoted by: >>1896882

this is quite possibly the most retarded thread i have ever read. this is dumber than the stuff you find in /b/

>> No.1896876

>>1896851
Derp J/(g·K) should be used because its 5lb mass. Ice wins out by more!

Ice 2.05
Water 4.1813
Carbon Dioxide 0.839
Nitrogen 1.040

>> No.1896882

>>1896871
I know something dumber, starts with an R, ends with a N. Play the game.

>> No.1897038

>>1896851
Specific heat capacity is not what we are after. What we need is the entropy of fusion, vaporisation and sublimations.

>> No.1897176
Quoted by: >>1897385

dry ice 645 kJ·kg entropy of sublimation
nitrogen 200 kJ·kg entropy of vaporisation
water 333.55 kJ·kg entropy of fusion

>> No.1897343
Quoted by: >>1897385

dry ice 645 kJ·kg
water 333.55 kJ·kg

Looks bad for water right?
Well lets say we then take the now melted ice and bring it from 0°c to 20°c that will extract 83 more kJ·kg and if the ice was -20°c we can add in another 42 kJ·kg giving us a total of 458.55 kJ·kg.

This is still lower than dry ice but it dose not have a suffocation hazard.

>> No.1897385
Quoted by: >>1897510

>>1897343
>>1897176

Herp a Derp, guys. He is asking about Watter, not water. Whats the entropy of Watter fusibliminating?

>> No.1897510
Quoted by: >>1898495

>>1897385
http://sco.wikipedia.org/wiki/Watter

>> No.1897676

I estamate that someone working might burn 200 kcal per hour, this is the same as 836.8 kJ this would be about two kg of ice each hour.

>> No.1897683
Quoted by: >>1897958

The only people who work outside are poor. Poor people can't buy space suits.

>> No.1897958

>>1897683
Companies that work for the government make bank. Its called cost plus contracting, they get payed whatever they spend plus 10-20% so the more they spend the more they earn. Why not have them spend some of this my way?

>> No.1898103
Quoted by: >>1898134

We have those. They're called coldsuits. You pretty much can't go outside without one except in the dead of winter.

>> No.1898134

>>1898103
So... I'm going to make billions on this idea?

>> No.1898495

>>1897510

wow, what language is that? or si that some ebonics?

>>
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