7,28. Saturated steam at 29.8 psig is to be used to heat a stream of ethane at constant pressure. The ethane enters the heat exchanger at 60°F and 20 psia at a rate of 27 890 ft³/min and is heated to 200°F. The steam condenses and leaves the exchanger as a liquid at 80°F. The specific enthalpy of ethane at 20 psia is 450 Btu/lb at 60°F and 513 Btu/lbm at 200°F. (a) How much heat (Btu/min) must be provided to heat the ethane from 60°F to 200°F? (b) At what rate in ft3/min must steam be supplied to the heat exchanger?
7,28. Saturated steam at 29.8 psig is to be used to heat a stream of ethane at constant pressure. The ethane enters the heat exchanger at 60°F and 20 psia at a rate of 27 890 ft³/min and is heated to 200°F. The steam condenses and leaves the exchanger as a liquid at 80°F. The specific enthalpy of ethane at 20 psia is 450 Btu/lb at 60°F and 513 Btu/lbm at 200°F. (a) How much heat (Btu/min) must be provided to heat the ethane from 60°F to 200°F? (b) At what rate in ft3/min must steam be supplied to the heat exchanger?
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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Transcribed Image Text:728. Saturated steam at 29.8 psig is to be used to heat a stream of ethane at constant pressure.
The ethane enters the heat exchanger at 60°F and 20 psia at a rate of 27 890 ft³/min
and is heated to 200°F. The steam condenses and leaves the exchanger as a liquid at
80°F. The specific enthalpy of ethane at 20 psia is 450 Btu/lb at 60°F and 513 Btu/lbm
at 200°F.
(a)
How much heat (Btu/min) must be provided to heat the ethane from 60°F to
200°F?
(b) At what rate in ft3/min must steam be supplied to the heat exchanger?
Ans: a) Q = 188,928 Btu/min. b) 1605 ft³/min
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