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Calculation Of Exhaust Energy

05/17/2016 6:52 AM

I have data of exhaust energy and energy dissipated to cooling circuits in a engine at full rated load.

Now I have to calculate exhaust energy and energy dissipated to cooling circuits at different loads.

Can you please guide me how should I proceed with the calculation.

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#1

Re: Calculation of exhaust Energy

05/17/2016 7:17 AM

Using the concept of an energy balance: Input = output + accumulation.

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#2
In reply to #1

Re: Calculation of exhaust Energy

05/17/2016 7:24 AM

Thank you for your response.

How can we find the accumulated energy?

Accumulation energy is related to which factors. Please give some formula if it is there.

and if not please tell the process for calculation.

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#7
In reply to #2

Re: Calculation of exhaust Energy

05/17/2016 8:41 AM

There is no accumulation in the case of an engine.

Please explain why the fundamental concept of Conservation of Energy is an insufficient explanation for the methodology of carrying out an energy balance.

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#3

Re: Calculation of exhaust Energy

05/17/2016 7:38 AM

Use algebra!

It might be proportional!

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#4
In reply to #3

Re: Calculation of exhaust Energy

05/17/2016 8:01 AM

Your answer says you are uncertain. You are saying it might be propotional and after that you are talking about common sense.

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#8
In reply to #4

Re: Calculation of exhaust Energy

05/17/2016 9:22 AM

Yeah and others call it my punch line!

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#5

Re: Calculation Of Exhaust Energy

05/17/2016 8:11 AM

Read about Heat transfer ( conduction, radiation & convection) and study some examples. I assure you can solve your problem.

Or the easier way around, get IR cam, some features let you know how much exhaust energy is going out your engine. some call it flux.

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#6

Re: Calculation Of Exhaust Energy

05/17/2016 8:19 AM

Based on your replies to my esteemed colleagues' suggestions, my advice is to return to your university texts and notes and remind yourself of some basic second year thermodynamics.

If after doing this, you still cannot proceed, I suggest you seek some tutoring.

None of us are able to provide equations for you as we do not have the details of the system in question. The basics of the required approach are given in the previous posts.

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#9

Re: Calculation Of Exhaust Energy

05/17/2016 9:38 AM

Just assume it's proportional.

That should make the math easy.

If it's actually critical to have an exact proportional calculation at different loads, I imagine someone else would have been given this assignment.

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#11
In reply to #9

Re: Calculation Of Exhaust Energy

05/18/2016 12:26 AM

Thank you for your response. But I am said that it won't be propotional and I have to calculate the exact energy in exhaust gas and cooling circuit. Is there any way in which I can do it?

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#12
In reply to #11

Re: Calculation Of Exhaust Energy

05/18/2016 4:27 AM

Take lyn's advice. Any deviation from proportional will be small, and how would anybody know? It would take some quite sophisticated measurements to try to find the actual figures.

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#10

Re: Calculation Of Exhaust Energy

05/17/2016 10:37 AM

If your cooling circuits are designed for full load, anything less than that is not a problem...anything greater than that is beyond design limits...

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