Water is heated by hot air in a heat exchanger. The flow rate of the water is 12 kg s-1 and that of the air is 2 kg s-1. The water enters at 40 °C and the air enters at 460 °C. The overall heat transfer coefficient of the heat exchanger is 275 W m-2 K-1 based on a surface area of 14 m2. a) Determine the effectiveness of the heat exchanger if it is: i. parallel-flow type; ii. cross-flow type (both fluids unmixed). b) Calculate the heat transfer rate for the two types of heat exchangers. c) Calculate the outlet temperatures of the hot and cold fluids for the conditions given for the two types of heat exchangers. Data: Cp,Air = 1059 J kg-1 K-1 Cp,Water = 4178 J kg-1 K-1
Water is heated by hot air in a heat exchanger. The flow rate of the water is 12 kg s-1 and that of the air is 2 kg s-1. The water enters at 40 °C and the air enters at 460 °C. The overall heat transfer coefficient of the heat exchanger is 275 W m-2 K-1 based on a surface area of 14 m2. a) Determine the effectiveness of the heat exchanger if it is: i. parallel-flow type; ii. cross-flow type (both fluids unmixed). b) Calculate the heat transfer rate for the two types of heat exchangers. c) Calculate the outlet temperatures of the hot and cold fluids for the conditions given for the two types of heat exchangers. Data: Cp,Air = 1059 J kg-1 K-1 Cp,Water = 4178 J kg-1 K-1
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
Water is heated by hot air in a heat exchanger. The flow rate of the water
is 12 kg s-1 and that of the air is 2 kg s-1. The water enters at 40 °C and
the air enters at 460 °C. The overall heat transfer coefficient of the heat
exchanger is 275 W m-2 K-1 based on a surface area of 14 m2.
a) Determine the effectiveness of the heat exchanger if it is:
i. parallel-flow type;
ii. cross-flow type (both fluids unmixed).
b) Calculate the heat transfer rate for the two types of heat exchangers.
c) Calculate the outlet temperatures of the hot and cold fluids for the
conditions given for the two types of heat exchangers.
Data:
Cp,Air = 1059 J kg-1 K-1
Cp,Water = 4178 J kg-1 K-1
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