A perfectly insulated, concentric tube countercurrent heat exchanger is used to cool lubricating oil using water as a coolant (see figure below). Oil enters the outer annulus at a mass flow rate of 2 kg.s-¹ with a temperature of 100 °C and leaves at 40 °C. Water enters the inner tube at a mass flow rate of 1 kg.s-1 with a temperature of 20 °C and leaves at 80 °C. Use specific heats of oil and water as 2089 J.kg ¹K-¹ and 4178 J.kg- 1K-1, respectively. There is no phase change in both the streams. Under steady-state conditions, the number of transfer units (NTU) is (in integer). 40°C Water 20°C 100°C 80°C Oil
A perfectly insulated, concentric tube countercurrent heat exchanger is used to cool lubricating oil using water as a coolant (see figure below). Oil enters the outer annulus at a mass flow rate of 2 kg.s-¹ with a temperature of 100 °C and leaves at 40 °C. Water enters the inner tube at a mass flow rate of 1 kg.s-1 with a temperature of 20 °C and leaves at 80 °C. Use specific heats of oil and water as 2089 J.kg ¹K-¹ and 4178 J.kg- 1K-1, respectively. There is no phase change in both the streams. Under steady-state conditions, the number of transfer units (NTU) is (in integer). 40°C Water 20°C 100°C 80°C Oil
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:A perfectly insulated, concentric tube countercurrent heat exchanger is used to cool
lubricating oil using water as a coolant (see figure below). Oil enters the outer annulus
at a mass flow rate of 2 kg.s-¹ with a temperature of 100 °C and leaves at 40 °C. Water
enters the inner tube at a mass flow rate of 1 kg.s-1 with a temperature of 20 °C and
leaves at 80 °C. Use specific heats of oil and water as 2089 J.kg ¹K-¹ and 4178 J.kg-
1K-1, respectively. There is no phase change in both the streams. Under steady-state
conditions, the number of transfer units (NTU) is
(in integer).
40°C
Water
20°C
100°C
80°C
Oil
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