Re: don't bother ... with numbers - Saab Performance Bulletin Board - Saabnet.com
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Re: don't bother ... with numbers
Posted by Todd 83-900T (more from Todd 83-900T) on Wed, 14 Aug 2002 14:40:41
In Reply to: don't bother ..., Kevin K [Profile/Gallery]
, Wed, 14 Aug 2002 12:49:33
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For fun lets assume that you get the water down to 0 C. The enthalpy increase due to the heat transfer to the water from 0C to 100C at 1 atm is
Cp_H20 * (T_hot - T_cold)
Cp(H20) = 4.184 kJ/kg K
4.184 * 100 = 418.4 kJ/kg
Now the enthalpy of evaporation (100C, 101325) is 2257 kJ/kg so the heat absorbed would be 2257 + 418.4 = 2675 kJ/kg.
If you didn't cool the water down the heat absorbed would be, (T of water = 30C)
4.184*(100 - 30) = 292.8 kJ/kg
2257 + 292.8 = 2549.8 kJ/kg
So the precent increase in the heat absorbed by cooling it down is
100*(2675 - 2549)/2549 = 5 %.
What's your time and effort worth?
Todd
posted by 128.110.4...
Posts in this Thread:
- Dumb Q.... Brad, WASSAAB, etc.... ice in ww reservoir?, Taylor (one of many), Wed, 14 Aug 2002 11:48:24
- It wont hurt,Only can help,Free & easy,Im doing it n/m, Taylor, Thu, 15 Aug 2002 09:26:25
- temp fix more work then its worth...., ckpaden, Wed, 14 Aug 2002 15:24:20
- It won't hurt it, WASSAAB, Wed, 14 Aug 2002 14:10:06
- Re: Dumb Q.... Brad, WASSAAB, etc.... ice in ww reservoir?, Craig, Wed, 14 Aug 2002 13:06:41
- don't bother ..., Kevin K , Wed, 14 Aug 2002 12:49:33
- Re: Dumb Q.... Brad, WASSAAB, etc.... ice in ww reservoir?, Stephen, Wed, 14 Aug 2002 12:38:06
- Sorry for the "(one of many)" - Dumb IE auto-fillin n/m, Taylor, Wed, 14 Aug 2002 11:50:14
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