BTUH = GPM * Delta-T * 60 Min./Hr. * Weight_of_1_Gal_H2O

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lsayre
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Post by lsayre » Thu. Jan. 07, 2021 8:30 am

In the past I had always used 8.33 or 8.34 as waters weight in pounds per gallon when using the subject line equation, but waters weight per gallon is highly temperature dependent. To improve this equation for hot water boiler use substitute the following weights for 1 gallon of water:

For 140 degrees: 8.21
For 150 degrees: 8.18
For 160 degrees: 8.16
For 170 degrees: 8.13
For 180 degrees: 8.11
For 190 degrees: 8.07
For 200 degrees: 8.03
For 210 degrees: 8.00

Note for reference: At 68 degrees a gallon of water weighs 8.33 pounds. At 54.5 degrees it weighs 8.34 pounds.
Last edited by lsayre on Thu. Jan. 07, 2021 8:38 am, edited 2 times in total.

 
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Post by Rob R. » Thu. Jan. 07, 2021 8:36 am

Yes - if you follow Taco's instructions for sizing circulators you will see they give you a correction factor for the fluid depending on the temperature and makeup (glycol vs water).

 
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Post by franco b » Thu. Jan. 07, 2021 8:58 am

Water is lighter carrying it in a bucket with a handle, than holding out in front. Time of day and how you are feeling along with age can make it heavier too.

 
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Post by lsayre » Thu. Jan. 07, 2021 9:20 am

franco b wrote:
Thu. Jan. 07, 2021 8:58 am
Water is lighter carrying it in a bucket with a handle, than holding out in front. Time of day and how you are feeling along with age can make it heavier too.
It feels very heavy to me now.

Of course if you start with 8.33 pounds of water it will weigh 8.33 pounds at any temperature sans for when it starts boiling off, but its volume will be changing. A gallon is a specific unit of volume.
Last edited by lsayre on Thu. Jan. 07, 2021 9:24 am, edited 1 time in total.


 
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Post by fig » Thu. Jan. 07, 2021 9:23 am

I thought water is 8.8 lbs per gallon. When I worked at a chemical company that’s the weight they used when filling their steam jacket reactors.

 
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Post by lsayre » Thu. Jan. 07, 2021 9:30 am

The most 1 gallon of water weighs is 8.3452 pounds per gallon, and that happens at 4 degrees C. (39.2 degrees F.). But that is at atmospheric pressure. Water is said to be non-compressible, but that may not be fully true. You are likely talking of high pressure.
Last edited by lsayre on Thu. Jan. 07, 2021 9:32 am, edited 1 time in total.

 
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Post by Holdencoal » Thu. Jan. 07, 2021 9:31 am

I normally just add one thing to the bucket of water and it becomes lighter.

 
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Post by lsayre » Thu. Jan. 07, 2021 9:33 am

Holdencoal wrote:
Thu. Jan. 07, 2021 9:31 am
I normally just add one thing to the bucket of water and it becomes lighter.
It becomes lighter when I hand it to my son.


 
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Post by lsayre » Thu. Jan. 07, 2021 9:36 am

I should have stated that BTUH = BTU's per hour

 
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Post by lsayre » Thu. Jan. 07, 2021 9:55 am

For water at 26.69 PSIA (or 12 PSI above atmospheric pressure) and at 180 degrees F. weighs ~8.1 /Lbs./Gal.

http://www.peacesoftware.de/einigewerte/wasser_dampf_e.html

Per this calculator:
Density = 970.44 Kg./M^3 = 0.97044 g./CC

8.3452 x 0.97044 = 8.0985 Lbs./Gal.

The same water at 14.69 PSI (atmospheric pressure):

Density = 970.4047 Kg/M^3 = 0.9704047 g./CC

8.3452 x 0.9704047 = 8.0982 Lbs./Gal.

So water is somewhat compressible, but at residential hot water boiler pressures you would never notice it.

 
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Post by TashiaGerard » Wed. May. 19, 2021 5:00 pm

Is weight a big deal? Sorry I'm new to all this.

 
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Post by freetown fred » Wed. May. 19, 2021 8:17 pm

It's just numbers T!!!!!!!!! :) Just enough to confuse people!! LOL

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