Question

How long would it take a 20Kw heater to warm up 1000 litres of water from 15 degrees to 55 degrees in hours? specific heat of water = 4.18kJ.

also

How much heat would a block of ice melting at 200Kg per hour absorb?

thanks if anyone can help!
How much heat is needed?
q = mass H2O x specific heat H2O x delta T.
Then J/s x s = 20,000 watt. Solve for s and convert to hours.

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