Energy Storage in Water - kWh
Thermal heat energy stored in water
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Water is commonly used to store thermal heat energy. Energy stored - or available - can be calculated as
E = cp dt m (1)
where
E = energy (kJ, Btu)
cp = specific heat capacity (kJ/kgoC, Btu/lb oF) (4.2 kJ/kgoC, 1 Btu/lbmoF for water)
dt = temperature difference between water stored and the surroundings (oC, oF))
m = mass of water (kg, lbm)
Example - Energy stored in a 1000 liter water reservoir
If water is heated to 90oC and surrounding temperature (where the energy can be transferred to) is 20oC - energy stored can be calculated as
E = 4.2 (kJ/kgoC) (90 (oC) - 20 (oC)) 1000 (liter) 1 (kg/liter)
= 294000 kJ
= 81.7 kWh
- 1 J (Joule) = 0,1020 kpm = 2.778x10-7 kWh = 2.389x10-4 kcal = 0.7376 ft lbf = 1 (kg m2)/s2 = 1 watt second = 1 Nm = 1 ft lb = 9.478x10-4 Btu
Energy Stored in Water - Liters / kWh
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Related Topics
- Thermodynamics - The effects of work, heat and energy on a system
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Related Documents
- Energy Conversion Factors -
- Energy Density for various Storage Forms - Energy density by weight and volume for some common storage forms
