Let's look back at the Quetsion #4 where one fluid had convection coefficient of 100 150 W/m².K. Let's consider that we change the second fluid such that its convection coeffient become twice of what it was in Quetsion #4 of HW#4. The first fluid is the hot fluid which comes in at 78°C and exits at 62°C. The second fluid (i.e., the cold fluid) enters the heat exchanger at 35°C and exits at 67°C. Let us also consider that this is a concentric-tube heat exchanger. (a) Look at the inlet and outlet temperatures and explain if this is a counter-flow or a parallel-flow heat exchanger. (b) What is the overall heat transfer coefficient of the heat exchanger? (c) The heat capacity rate of the hot fluid was found to be 1080 W/°C. If the cold fluid is water (with a specific heat of 4180 J/kg-K), what is the required mass flow for the water? (d) What is the required heat transfer surface area?

Let's look back at the Quetsion #4 where one fluid had convection coefficient of 100 150 W/m².K. Let's consider that we change the second fluid such that its convection coeffient become twice of what it was in Quetsion #4 of HW#4. The first fluid is the hot fluid which comes in at 78°C and exits at 62°C. The second fluid (i.e., the cold fluid) enters the heat exchanger at 35°C and exits at 67°C. Let us also consider that this is a concentric-tube heat exchanger. (a) Look at the inlet and outlet temperatures and explain if this is a counter-flow or a parallel-flow heat exchanger. (b) What is the overall heat transfer coefficient of the heat exchanger? (c) The heat capacity rate of the hot fluid was found to be 1080 W/°C. If the cold fluid is water (with a specific heat of 4180 J/kg-K), what is the required mass flow for the water? (d) What is the required heat transfer surface area?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Section: Chapter Questions

Problem 1.1MA

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.

Question

DONT DO PROBLEM 4 it just here for reference. DO THE OTHER PROBLEM.

Let's look back at the Quetsion #4
where one fluid had convection coefficient of
100 150 W/m2.K. Let's consider that we change the second fluid such that its convection coeffient
become twice of what it was in Quetsion #4 of HW#4. The first fluid is the hot fluid which comes
in at 78°C and exits at 62°C. The second fluid (i.e., the cold fluid) enters the heat exchanger at
35°C and exits at 67°C. Let us also consider that this is a concentric-tube heat exchanger.
(a) Look at the inlet and outlet temperatures and explain if this is a counter-flow or a parallel-flow
heat exchanger.
(b) What is the overall heat transfer coefficient of the heat exchanger?
(c) The heat capacity rate of the hot fluid was found to be 1080 W/°C. If the cold fluid is water
(with a specific heat of 4180 J/kg-K), what is the required mass flow for the water?
(d) What is the required heat transfer surface area?

4. A heat exchanger is made of thin and conductive materials. It's overall heat transfer coefficient
was found to be 100 W/m².K. If the convection coefficient of one fluid is 150 W/m2.K, what is the
convection coefficient of the other fluid?

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