A water heater that will delivers 1kg of water per minute is required. The water is supplied at 20°C and an output temperature of 80°C is desired.
What should be the resistance of the heating element in the water if the line voltage is 220V?
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Explanation:
Power of water =2 kw=2000w
Mass of water =200kg
difference in temperature ΔT=70−10=60
o
C
Concept
energy required to heat the water = energy given by water in time t=pt
energy required to increase tempeature of water by 60
o
C,Q=msΔT
S= specific heat =4200J/kg
o
C
pt=msΔT
2000×t=200×4200×60
t=25200
or t=25.2×10
3
sec.
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