Differences between revisions 2 and 3

Storing Energy in water as heat

Links eco/sunpower/SolarPanel , eco/water

E = cp dt m

cp = specific heat capacity 4.2 kJ/kgoC for water
dt = temperature difference between water stored and the surroundings
m = mass of water in kg

Example1

     Energy stored in a 1000 liter water reservoir
     If water is heated to 90C and surrounding temperature is 20C
     E = 4.2 (kJ/kgC) x (90 - 20) x 1000 (liter@1kg/liter)
       = 294000 kJ
       = 81.7 kWh  (1kWh = 3600kJ)

Example2

     How much energy (kWh) to heat geyser of 300l from 15C to 60C ?
     E = 4.2 (kJ/kgC) x (60 - 15) x 300
       = 56700 kJ
       = 15.8 kWh  (1kWh = 3600kJ)

heat of vaporization of water is 2256 kJ/kg

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-  ⇤ ← Revision 2 as of 2013-04-16 21:34:23 → 
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+   ← Revision 3 as of 2013-04-16 21:44:18 → ⇥
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  Comment:
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+  * heat of vaporization of water is 2256 kJ/kg