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Consider the heating of a house by a furnace, which serves as a heat-source reservoir at a high temperature TF. The house acts as a heat-sink reservoir at temperature T, and heat IQI must be added to the house during a particular time interval to maintain this temperature. Heat IQ can of course be transferred directly from the furnace to the house, as is the usual practice. However, a third heat reservoir is readily available, namely, the surroundings at temperature To, which can serve as another heat source, thus reducing the amount of heat required from the furnace. Given that TF=810 K, T=295 K, T-265 K, and IQ1 = 1000 kJ, determine the minimum amount of heat QF which must be extracted from the heat-source reservoir (furnace) at TF. No other sources of energy are available.

Consider the heating of a house by a furnace, which serves as a heat-source reservoir at a high temperature TF. The house acts as a heat-sink reservoir at temperature T, and heat IQI must be added to the house during a particular time interval to maintain this temperature. Heat IQ can of course be transferred directly from the furnace to the house, as is the usual practice. However, a third heat reservoir is readily available, namely, the surroundings at temperature To, which can serve as another heat source, thus reducing the amount of heat required from the furnace. Given that TF=810 K, T=295 K, T-265 K, and IQ1 = 1000 kJ, determine the minimum amount of heat QF which must be extracted from the heat-source reservoir (furnace) at TF. No other sources of energy are available.

Introduction to Chemical Engineering Thermodynamics
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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Consider the heating of a house by a furnace, which serves as a heat-source reservoir at a high temperature TF. The house acts as a heat-sink reservoir at temperature T, and heat Q must be added to the house during a particular time interval to maintain this temperature. Heat IQ can of course be transferred directly from the furnace to the house, as is the usual practice. However, a third heat reservoir is readily available, namely, the surroundings at temperature To, which can serve as another heat source, thus reducing the amount of heat required from the furnace. Given that TF=810 K, T=295 K, T=265 K, and |Q| = 1000 kJ, determine the minimum amount of heat QF which must be extracted from the heat-source reservoir (furnace) at TF. No other sources of energy are available.
Transcribed Image Text:Consider the heating of a house by a furnace, which serves as a heat-source reservoir at a high temperature TF. The house acts as a heat-sink reservoir at temperature T, and heat Q must be added to the house during a particular time interval to maintain this temperature. Heat IQ can of course be transferred directly from the furnace to the house, as is the usual practice. However, a third heat reservoir is readily available, namely, the surroundings at temperature To, which can serve as another heat source, thus reducing the amount of heat required from the furnace. Given that TF=810 K, T=295 K, T=265 K, and |Q| = 1000 kJ, determine the minimum amount of heat QF which must be extracted from the heat-source reservoir (furnace) at TF. No other sources of energy are available.
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