1. (a) Hot oil at a flow rate of 5.5 kg/s (average cp = 1.92 kJ/kgK) enters an existing counter-flow exchanger at 435 K and is cooled by water entering at 325 K (under pressure) and flowing at a rate of 7.2 kg/s and the water exit temperature is 350 K. The overall heat transfer coefficient based on the outside area is 685 W/m²K (Average specific heat of water is 4.187 kJ/kgK). (i) Calculate the exit oil temperature. (ii) Calculate the heat transfer area. (b) The fluid in (a) enters an existing co-current-flow exchanger at the same conditions. (i) Calculate the heat transfer area. (ii) Explain the performance of both heat exchangers.
1. (a) Hot oil at a flow rate of 5.5 kg/s (average cp = 1.92 kJ/kgK) enters an existing counter-flow exchanger at 435 K and is cooled by water entering at 325 K (under pressure) and flowing at a rate of 7.2 kg/s and the water exit temperature is 350 K. The overall heat transfer coefficient based on the outside area is 685 W/m²K (Average specific heat of water is 4.187 kJ/kgK). (i) Calculate the exit oil temperature. (ii) Calculate the heat transfer area. (b) The fluid in (a) enters an existing co-current-flow exchanger at the same conditions. (i) Calculate the heat transfer area. (ii) Explain the performance of both heat exchangers.
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:1.
(a)
Hot oil at a flow rate of 5.5 kg/s (average cp = 1.92 kJ/kgK) enters
an existing counter-flow exchanger at 435 K and is cooled by
water entering at 325 K (under pressure) and flowing at a rate of
7.2 kg/s and the water exit temperature is 350 K. The overall heat
transfer coefficient based on the outside area is 685 W/m²K
(Average specific heat of water is 4.187 kJ/kgK).
(i)
Calculate the exit oil temperature.
(ii) Calculate the heat transfer area.
(b)
The fluid in (a) enters an existing co-current-flow exchanger at the
same conditions.
(i)
Calculate the heat transfer area.
(ii)
Explain the performance of both heat exchangers.
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