Concept explainers
(a)
The outlet temperatures of both streams in steady operation using the LMTD method.
(a)
Explanation of Solution
Given:
The mass flow rate of steam
The specific heat of steam
The temperature of steam inlet
The mass flow rate of other steam
The specific heat of other steam
The temperature of other steam inlet
The overall heat transfer coefficient
The area of heat exchanger
Calculation:
Calculate the rate of heat transfer
Calculate the rate of heat transfer
Calculate the Logarithmic mean temperature
Calculate the heat transfer rate
Solve the above equation to obtain the outlet temperature of hot steam
Thus, the outlet temperatures of hot steam is
(b)
The outlet temperatures of both streams in steady operation using the effectiveness–NTU method.
(b)
Explanation of Solution
Calculation:
Calculate the product of mass flow rate of hot stream and specific heat
Calculate the product of mass flow rate of cold steam and specific heat
Calculate the heat capacity ratio
Calculate the number of transfer units
Calculate the effectiveness of this parallel-flow heat exchanger
Calculate the maximum heat transfer rate
Calculate the heat transfer rate
Calculate the outlet temperature of cold steam
Calculate the outlet temperature of hot steam
Thus, the outlet temperatures of hot steam is
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Chapter 22 Solutions
Fundamentals of Thermal-Fluid Sciences
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