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Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Question

A container holding 12 kg of water at 60 °C is placed in a freezer that is
kept at -30 °C. The room temperature is 20 °C. The water freezes and comes into thermal equilibrium with the interior of the freezer. (Specific heat for water and for ice are 4186 and 2000 J/(kg C) respectively. The latent heat of fusion for water is 33.5x10^4 J/kg ).
a) How much heat is extracted from the water/ice in this process?
b) What is the minimum amount of electrical energy required by the refrigerator to do this? Hint: The refrigerator operates between reservoirs at temperatures of 20 °C and -30 °C.

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