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RayWohlfarth
Posts: **627**Member

Howdy Wall Citizens,

I have the first draft complete on my new book on Heating Rules of Thumb and Formulas. I was wondering if you have any rules of thumb, secret calculations, or formulas you like to use and think would be beneficial to other wrench twisters like myself. The book is about 180 pages already. I never knew how much we had to know.

Thanks

Ray

I have the first draft complete on my new book on Heating Rules of Thumb and Formulas. I was wondering if you have any rules of thumb, secret calculations, or formulas you like to use and think would be beneficial to other wrench twisters like myself. The book is about 180 pages already. I never knew how much we had to know.

Thanks

Ray

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## Comments

176MemberHow about the value of 231? Cubic inches in a gallon; add a decimal point & 2.31 feet water column equals 1 psi.

627MemberBoiler Lessons

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721MemberA cube of water 1 foot on each side weighs 62.4 pounds

Area of bottom of cube is simply = (12x 12) =144 square inches

So pressure on bottom is 62.4/144 = .4333 pounds/sq inch ( psi)

That's .433 psi /foot of depth

If using oil with a specific gravity of .7 that pressure is .7 x .4333 =0.30 psi/ft

Which means a hose of that oil 10 ft tall will make 3 psi at bottom.

(check SG, gasoline = ~.7 , think #2 oil is higher)

I did so much sonabouy design work I can't forget water weighs ~ 62.4 #/cubic foot ---- ( this is it's density)

627MemberBoiler Lessons

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721Member0.433 psi /foot of depth .... means 1,000 ft underwater it's 433 psi

And at bottom of Mariana Trench , the deepest known point in Earth's oceans. 36,070 feet depth means pressure is ~15,600 psi

(ignores that salt water is little heavier than 62.4 #/CF fresh water)

5,285Memberfuel oil 1" of vacuum for every foot of vertical lift + .5" vacuum for every foot of horizontal run.

1000 btu/lb of steam. lbs of steam =lbs of condensate. lbs of condensate/8.33=gallons of condensate.

Air handle capacity is 400-450 cfm/ton of cooling

3,353MemberWilson Services, Inc

Northampton, MA

www.wilsonph.com

[email protected]

3,353MemberWilson Services, Inc

Northampton, MA

www.wilsonph.com

[email protected]

627MemberBoiler Lessons

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2,192MemberOh wait.

My bad.

"72°F Mechanical, LLC"

Or email John at [email protected]

John is a professional Master Plumber, licensed by The Department of Buildings of The City of New York, and works extensively in NYC while consulting for clients in and out of state.

627MemberBoiler Lessons

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1,628Member--------------------------------------------------------------------------------------------

Formulas used to calculate annual energy costs:

Natural Gas (BtuHr loss of House / AFUE of appliance) X (Htg Load Hrs /100,000) X .77 X Gas rate per 100 cf = cost to heat.

L. P. Gas (BtuHr loss of House / AFUE of appliance) X (Htg Load Hrs /91,500) X .77 X Gas cost per gallon = cost to heat.

Oil (BtuHr loss of House / AFUE of appliance) X (Htg Load Hrs /138,000) X .77 X Oil cost per gallon = cost to heat.

Heat Pump (BtuHr loss of House / HSPF) X (Htg Load Hrs / 1,000) X .77 X Electric rate per kWh = cost to heat.

Electric Resistance (BtuHr loss of House / 3.143) X (Htg Load Hrs / 1,000) X .77 X Electric rate per kWh = cost to heat.

Cooling Costs (BtuHr gain of House / SEER) X (Cooling Load Hrs / 1,000) X .77 X Electric rate per kWh = cost to cool

627MemberBoiler Lessons

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11,140MemberHeat= 8.33v (delta t)

trainer for Caleffi NA

The magic is in hydronics, and hydronics is in me627MemberBoiler Lessons

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1,283Member2,193MemberNJ Master HVAC Lic.

Mahwah, NJ

Specializing in steam and hydronic heating