how many gallons per minute

Joe Mattiello_2

Is the 119 linear ft of baseboard all one loop? Assuming 600 btu per ft is approximately, 71,000 btu output. again assuming 20 delta T your flow rate require is approx 7 gpm, and your head would be 11.8 per 100 ft. Not knowing how many elbow, and valves on your run we can add 50% piping @ 119 x 1.5 = 179 linear ft. 11.8 X 1.79= 21 ft so your design would be 7 gpm @ 21 ft. couple of problem with that velocity 4.21 ft can cause erosion, and noise. Additionally, the circulator a 0014 will be larger, and more expensive to purchase, operate. Alternatively, you can split the loop down the center have better performance with only 3.5 gpm required. Your new system curve will be a lot better with 2.2 ft velocity, 3.5 gpm @ 3.5 ft of head. Now you can use a Taco 007. Hopefully this helps you with your pump selection. For your reference I have attached a submittal data sheet.
Joe Mattiello
Technical Support Technician
Tel. 401-942-8000 X 484
Fax. 401-942-2360
1160 Cranston St
Cranston, RI 02920
joemat@taco-hvac.com

shawn_10

I would like to know how how many gallon per minute I need for 119 linear ft. of bb I have it set up for 1 zone 3 split loops what other info. do i need to figure what size circ. i need.I have it set up off of 1 1/'4 pipe any thoughts would be appreciated.thank you

Rich Corcoran_33

GPM

is derived from the amount of heat you want to deliver. Your design temp will determine the output/ft of the baseboard. Once you know the btu's, divide by 10,000 (assuming a 20 delta T), this will give you gpm. Then look at a pipe chart to make sure you keep the velocity under 4 ft/sec. (avoids noise and the potential for pipe erosion.)

Once you determine the gpm, you can calculate the friction loss of the system and then select a pump.

RC

shawn_10

I have 70,000 btu that gives me 7 gpm now I dont have a pipe chats could someone tell me if I am under 4 ft per second

Brad White_9

7 GPM in a 1-1/4\" main

will be 1.5 FPS in new Sch. 40 steel and 1.79 FPS in Type L copper. Perfectly fine.

What size is the element tubing? 3/4"? 1"?

shawn_10

THE PIPING IS 3/'4 ELEMENT

Brad White_9

Figured it was...

Most element copper is Type M (thin wall). If 4 FPS velocity is your only criteria (it should not be, but if..), you could run up to 6 GPM and be at 3.72 FPS.

Your pressure drop rate per 100 feet of pipe would be 8.4 feet, way too high.

I would limit my element flow to 3 GPM in 3/4" pipe. This will yield a velocity of 1.86 FPS and a head loss of 2.49 feet per 100 feet of pipe. If your circuits are relatively balanced and proportional you should be ok.