SE- How to Determine Oil Temperature at Exit of Cylindrical Heat Exchanger?

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Homework Help Overview

The discussion revolves around determining the exit temperature of oil in a cylindrical heat exchanger, where the characteristics of the exchanger and properties of the fluids involved are known. The problem involves heat transfer between oil and water, with specific parameters provided for both fluids.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the initial approach of calculating heat transfer using the equation Q(oil)=m Cp dT, but express uncertainty regarding the mass flow rate of oil due to a lack of time information. There are questions about how to relate heat transfer rate to mass flow rate.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem and questioning the assumptions regarding mass flow rates and time. Some guidance has been offered regarding the relationship between heat transfer and mass flow, but no consensus has been reached.

Contextual Notes

Participants note the absence of certain information, such as the time variable needed to calculate mass flow, which is impacting their ability to proceed with the problem.

Bibinou
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Hello,
I have some problems in resolving this exercise.
Consider a cylindrical heat exchanger, whose you know all caracteristics (such as : inside diameter, outside diameter and its length). This exchanger is used to cool an oil phase with water.

We know the flow of water, its Cp and its temperature, moreover we also know the flow of oil, its Cp and its temperature.
We also know the global transfert coefficient K expressed in kW.m-².K-1

How can we determine the temperature of oil at the exit of the exchanger?

Thank you very much.
 
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What are your thoughts about the problem at the moment?
 
I don't know how to begin,
perhaps by computing Q(oil)=m Cp dT but I don't know the mass of oil given that I don't know the time => I can't deduce it from the flow
 
Bibinou said:
I don't know how to begin,
perhaps by computing Q(oil)=m Cp dT but I don't know the mass of oil given that I don't know the time => I can't deduce it from the flow
If you know the flow rate of the oil and of the water, you know dm/dt. How does dQ/dt relate to dm/dt?

AM
 

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