Let us use a heat pump to cook dinner! You set up a heat pump that has 40 % of its theoretical maximum COP, and you want to use heat from the kitchen at 24°C to supply 600 W of heat energy for boiling soup. Assume the soup is mostly water and that you want to heat it to 100°C. (a) How much electrical energy must the heat pump use? The heat pump uses _______J of electrical energy. (b) How much better is this than simply using an electric hot plate to supply the 600 W of heat energy? Using a heat pump is _____ times better than using an electric hot plate.
Let us use a heat pump to cook dinner! You set up a heat pump that has 40 % of its theoretical maximum COP, and you want to use heat from the kitchen at 24°C to supply 600 W of heat energy for boiling soup. Assume the soup is mostly water and that you want to heat it to 100°C. (a) How much electrical energy must the heat pump use? The heat pump uses _______J of electrical energy. (b) How much better is this than simply using an electric hot plate to supply the 600 W of heat energy? Using a heat pump is _____ times better than using an electric hot plate.
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter18: Heat Engines, Entropy, And The Second Law Of Thermodynamics
Section18.4: Heat Pumps And Refrigerators
Problem 18.3QQ
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Let us use a heat pump to cook dinner! You set up a heat pump that has 40 % of its theoretical maximum COP, and you want to use heat from the kitchen at 24°C to supply 600 W of heat energy for boiling soup. Assume the soup is mostly water and that you want to heat it to 100°C.
(a) How much electrical energy must the heat pump use?
The heat pump uses _______J of electrical energy.
(b) How much better is this than simply using an electric hot plate to supply the 600 W of heat energy?
Using a heat pump is _____ times better than using an electric hot plate.
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