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Join Date: Feb 2014
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Designing a Plate Heat Exchanger

02/14/2014 1:58 PM

I need to design a plate heat exchanger for my design project and I wanted to know where should I start. It is a steam-air heat exchanger.
Values I have:

Need your help!

Temperature Inlet Steam160
Temperature Outlet Steam80
Temperautre Inlet Air25
Temperature Outlet Air40
Mass flow rate air kg/hr2954.4
Efficiency %93
Pressure0.6 Mpa
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#1

Re: Designing a Plate Heat Exchanger

02/14/2014 2:06 PM

It's quite evident that this project is beyond your skills-set. Your have given the sizing spec's required, on top of actually design the plate heat exchanger it's self.

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#2
In reply to #1

Re: Designing a Plate Heat Exchanger

02/14/2014 2:26 PM

If you need a start, I would say establish your required surface area first. That is a good start. Happy calculating!

You need farther direction, let us know.

And welcome to CR4....

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#3

Re: Designing a Plate Heat Exchanger

02/14/2014 3:10 PM

Search for "plate heat exchanger design", using one of the many search engines available. How to Search the Internet - Hannon Library

If that fails, go the the library and read a book on the subject.

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#4

Re: Designing a Plate Heat Exchanger

02/14/2014 3:55 PM

did you read the part about "wee don't do your homework"?

listing your % effecientcy parameter is a dead give away this is an assignment

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#5
In reply to #4

Re: Designing a Plate Heat Exchanger

02/14/2014 5:10 PM

93% is pretty good.

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#6
In reply to #5

Re: Designing a Plate Heat Exchanger

02/14/2014 8:27 PM

Okay you got me on this one?

Where is the other 7% of the energy transfer going?

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#7
In reply to #6

Re: Designing a Plate Heat Exchanger

02/14/2014 8:34 PM

Ambient loses for one.

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#8
In reply to #7

Re: Designing a Plate Heat Exchanger

02/14/2014 9:25 PM

But it's a steam to air exchange. Any degree of insulation around it will put the I (steam)/O(air) transfer ratio at 100%

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#9
In reply to #8

Re: Designing a Plate Heat Exchanger

02/15/2014 11:55 PM

Maybe better than 93%, but never fully 100%. (Unless Tambient ≥ Tsteam.)

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#10
In reply to #8

Re: Designing a Plate Heat Exchanger

02/16/2014 2:41 PM

Insulation around a plate heat exchanger?..... Ahhhhh, that tells me you never had to do maintenance on one. Am I correct to say that?

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#11

Re: Designing a Plate Heat Exchanger

02/17/2014 3:11 AM

A few telephone calls to plate heat exchanger suppliers with this information will yield some useful quotations. At that point, detailed design from first principles becomes futile.

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#12

Re: Designing a Plate Heat Exchanger

02/17/2014 8:59 AM

Guest 2307....

Repeat after me "latent heat of saturated steam"...."latent heat of saturated steam"

Some points to ponder:

- Your HX has steam going in and steam going out ???!!???

- You have selected a plate-frame type HX to heat air ???!!???/! ???

- Do you understand the difference between steam and condensate ???

- Why do so many HXs that are supplied with a saturated steam heating source, reject condensate at virtually the same temperature as the inlet steam ??

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