An electric windshield defroster is used to remove 0.25-in of ice from a windshield. The properties of

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An electric windshield defroster is used to remove 0.25-in of ice from a windshield. The properties of the ice are Tsat = 32°F, uif = hif = 144 Btu/lbm, and v = 0.01602 ft3/lbm. Determine the electrical energy required per square foot of windshield surface area to melt this ice and remove it as liquid water at 32°F. What is the minimum temperature at which the defroster may be operated? Assume that no heat is transferred from the defroster or ice to the surroundings.
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Thermodynamics An Engineering Approach

ISBN: 978-0073398174

8th edition

Authors: Yunus A. Cengel, Michael A. Boles

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