Btu's of flowing water

Glenn Sossin_2

I made this chart up a while back. It should help you. It uses the generic 500 value for water (8.33lbs x 60min/hr)

Paul B_5

Flowing water Btu formula

What are the formulas for lets say a 10,20, or 30 deg temp drop /or temp gain of flowing water at say 1 gpm. Paul

Chris_91

Q = 500*gpm*delta T

The 500 is assuming you're pumping 100% water. The number reduces to 490-480 depending on concentration of glycol.

Delta T in F.

ALH_4

Specific heat

And the 500 is multiplied by the specific heat of the solution (based on glycol manufacturer supplied numbers). Water is 1 btu/lb-°F. 50% Dowfrost solution is 0.85 btu/lb-°F.

The 500 comes from water weighing 8.33lb/gal multiplied by 60 min/hour.

Dennis10

Paul, here's one I use when I need to figure out the flow rate for a zone at variuos delta t's Zone's BTU's divided by 500 divided by the delta T desired = the zone flow rate.

Glenn Sossin_2

wrong attachment

Sorry attached the wrong file. This is an excel sheet that lets you plug in various flow rates, delta t values, etc.