Water (C, = 4.18kJ/kg K) at 80°C enters a counter flow heat exchanger with a mass flow rate of 0.5kg/s. Air (C, = 1kJ/kg K) enters at 30°C with a mass flow rate of 2.09kg/s. If the effectiveness of the heat exchanger is 0.8, the LMTD (in

Water (C, = 4.18kJ/kg K) at 80°C enters a counter flow heat exchanger with a mass flow rate of 0.5kg/s. Air (C, = 1kJ/kg K) enters at 30°C with a mass flow rate of 2.09kg/s. If the effectiveness of the heat exchanger is 0.8, the LMTD (in

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.17P

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Concept explainers

Basic Thermodynamic Processes

The word 'thermodynamics' can be divided into two words, 'thermo' and 'dynamics'. The word thermo deals with the heat and thermal phenomenon, whereas dynamics deals with forces or external agent that drives the heat flow or aids in the motion of heat.

Question

Find logarithmic mean temperature difference ?

Water (C, = 4.18kJ/kg K) at 80°C enters a counter flow heat exchanger with a
mass flow rate of 0.5kg/s. Air (C, = 1kJ/kg K) enters at 30°C with a mass flow
rate of 2.09kg/s. If the effectiveness of the heat exchanger is 0.8, the LMTD (in

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