[TR] Water pumps.

[Dave]

Do not conflate delta T and heat flow.  That is similar to conflating volts and watts.  Or cash flow and assets.  A reduction in delta T due to an increase in flow rate doesn't mean less heat is removed.  You may be reducing the temperature of any given atom by half but you are reducing the temperature of twice as many atoms, therefore the heat transfer is the same.


 

 

Dave Massey, also a real engineer.


 (Why does the underwear gnome episode of South Park come to mind?)

 

-----Original Message-----
From: Michael Marr <mmarr at albiontechnical.com>
To: Jeff Scarbrough <fishplate at gmail.com>
Cc: Triumphs (triumphs at autox.team.net) <triumphs at autox.team.net>
Sent: Thu, May 11, 2017 7:38 am
Subject: Re: [TR] Water pumps.

The units of the heat transfer coefficient are BTU/sq ft-deg.  There is no time element in those units.  Changing the rate of flow through a heat exchanger, assuming the entering temperature stays the same, and operating within the design limits of the heat exchanger, simply changes the leaving temperature of the fluid.

And, I am a real engineer....

Mike

Michael Marr
Albion Technical Services
Mobile:  630-202-0065

Sent from my iPad

> On May 11, 2017, at 07:08, Jeff Scarbrough <fishplate at gmail.com> wrote:
> 
> On Wed, May 10, 2017 at 11:31 PM, Michael Marr
> <mmarr at albiontechnical.com> wrote:
>> The flow rate of the fluid through the heat exchanger does not affect how much heat is transferred.
> 
> This is true, but...
> 
> When warm fluid is replaced by cooler fluid, the delta T increases,
> resulting in faster heat transfer.
> 
> There is a happy medium, and I'm sure that back in the day, real
> engineers spent a lot of time with different vanes and pulley sizes
> until they found a combination that works.  Or maybe they just got
> lucky?
> 
> Jeff Scarbrough
> Corrosion Acres, Ga.
> 
> ** triumphs at autox.team.net **
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