To help keep his barn warm on cold days, a farmer stores 837 kg of solar-heated water (Lf = 3.35E+5 J/kg) in barrels. For how many hours would a 1.91 kW electric space heater have to operate to provide the same amount of heat as the water does, when it cools from 15.0 to 0 °C and completely freezes?

Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter21: Heat And The First Law Of Thermodynamics
Section: Chapter Questions
Problem 71PQ
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To help keep his barn warm on cold days, a farmer stores 837 kg of solar-heated water (Lf = 3.35E+5 J/kg) in barrels. For how many hours would a 1.91 kW electric space heater have to operate to provide the same amount of heat as the water does, when it cools from 15.0 to 0 °C and completely freezes?

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