higher humidity better cooling???
since water has a high capacity for energy storage, does it make sense that in aircooling, the room having higher humidity (30% vs 80% at same temperature) would give you lower temperatures on the CPU while aircooling it ...
does it make sense? |
It does. We examined this some time ago, and concluded that the difference would not be measurable.
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because of the low amount of water?
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There are tables of heat capacity of air at various humidities. You could look it up and see for yourself what difference it makes.
IIRC, humidity is taken into consideration when sizeing condensors and radiators on large commercial and industrial loads. |
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Have toyed with investigating but have found no data. |
I saw them in an HVAC text from the 60s I dug out of a university library last year. Sorry I couldn't even tell you the title.
It never occured to me that they were hard to find (and it didn't interest me since we're at near zero humidity here in Arizona 300+ days a year) |
Rough formula for calculating moisture content of air (works for me):
%RH*4.1561*EXP(0.0619*T) T is dry bulb air temp in °C result is in grams of water per m3 The rest should be plain sailing :) edit: IIRC, this is useable (ie <10% error) between 0 and 30°C edit2: pretty good stuff here- http://www.coolit.co.za/psychart/chapter1.htm (I think the Magnus formula is more trustworthy than mine...) |
Ta "lolito fr"
Think I could have looked harder. Will have a play(honour bound) and report anything interesting |
I looked up a few books today, and while I couldn't find any tables, I did find values for 0 and 100% humidity. You could probably use excel to plot the rest of the data points; its almost certainly linear, or at least very close to it.
0% = .24 (BTU/ft^3) 100% = .86 (at 70F and 1 Bar as I recall) So its actually pretty significant. |
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you think so? the most the average person would be confortable in is 55%-75% so like ,124BTU/ft^3 difference |
Using Air3.1 get :-
http://www.jr001b4751.pwp.blueyonder.co.uk/Moist.jpg A total effect on "C/Wradiator" of less than 4% with 25c ambient ( ~ 17% at 50c ambient) Edit - pasting data into Excel 97 produced arithmetic errors. Have corrected |
Corrected arithmetic errors in previous post
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