Sizing replacement steamer w/hydro loop...(JohnNY)

JohnNY

How do you guys figure adding in the demand created by the hydronic loop on an EDR calculation for replacement?


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DanHolohan

Size for steam

and then look at the pick-up factor. That's what you have available for the hydronic zone.

Unknown

You don't want to add anything, John

All there is available is the difference between the actual EDR and the actual output of the steam boiler (which usually is a little greater than the actual pick-up factor).

Any more load will effect balance on the steam side, and any extra boiler size can cause water level problems.

Noel

David Sutton_6

Hi Noel

Unknown

Hi David

Busy this month?

Noel

JohnNY

I don't care what Mr. Sweeney says...

you guys are alright after all.

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JohnNY

Yeah but..

I may be making this more complicated than it is, and I have never seen this happen, but:
What if the loop is very large and pulls a substantial amount of heat from the boiler. Couldn't the loop prevent the water from boiling if the input is only sized for the steam side?


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DanHolohan

If you keep it

within the pick-up factor it will work, John.

JohnNY

I think...

...I may have miscommunicated my question.
The hydro loop is existing. The boiler is existing.
I have an EDR of about 400 sq. ft. on the steam side but about 30 feet of baseboard element in a cellar zone.
I'm sizing for a replacement and must renergize the loop as did the 1000 sq. ft. boiler I'm removing.

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Unknown

Ahh, I see.

> ...I may have miscommunicated my question. The

> hydro loop is existing. The boiler is

> existing. I have an EDR of about 400 sq. ft. on

> the steam side but about 30 feet of baseboard

> element in a cellar zone. I'm sizing for a

> replacement and must renergize the loop as did

> the 1000 sq. ft. boiler I'm removing.

>

> _A

> HREF="http://www.heatinghelp.com/getListed.cfm?id=

> 290&Step=30"_To Learn More About This

> Professional, Click Here to Visit Their Ad in

> "Find A Professional"_/A_

Unknown

Ahh, I see.

Multiply the actual EDR installed by 240 (as you did), add the btu output of the baseboard, and see if you are still below the gross steam output on the boiler that you selected. Don't add the pickup factor, in this equation, it's included in the baseboard amount.

Noel

JohnNY

Great

So 30' of fin tube (30 x ~580btu) is 17,400 divided by 240 = ~72 sq. ft.
Add 72 to my EDR.

Or

Convert my EDR to BTU and add the 17,400 to get my total BTU load.

Check?

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Unknown

number two

afterwards, you still need to make sure that the EDR rating on the new boiler is the same or bigger as the installed steam radiator's EDR, as always.

Noel