EDR ?

Steamhead

some old convector literature- Dunham, Trane and Herman-Nelson. Do you know who made the convectors on that system?

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John Mills_3

convection cabinet

We're trying to size the radiation of a 2 pipe steam system. Most are convector cabinets more commonly found with hot water. In the cabinet is a fin-tube with 3/4" iron pipe surrounded by fins, like with hot water baseboard. The fins are 2" square. Any idea what the EDR of this is per linear foot?

DanHolohan

This should help

http://www.heatinghelp.com/newsletter.cfm?Id=81

It pays to wander off the Wall.

John Mills_3

I'm not sure the illustration in the picture is anywhere close. These are just convector cabinets. On Page 72 of Lost Art shows the cabinets but they are built in the wall. Inside them aren't radiators with sections but fin-tube like illustrated below on cast iron baseboard only 1 pass. Would the 3.4 sq ft per linear foot be right or should it be 1/2 that since it is 1 pass.

DanHolohan

Sorry, I misunderstood

Bryley has some ratings for odd fintubes but they're based on the element being in a baseboard size cabinet. He says nothing about convector cabinets, and that would make a difference, and so would the fins per foot (he gives those options).

Looking at the charts, though, it's generally about 650 BTUH per linear foot, based on hot water at 200 F, AWT. I imagine the output would be a bit higher within a cabinet.

John Mills_3

This is

STEAM!!! we have here. Was trying to come up with an EDR figure.

DanHolohan

I understand

you can interpolate from the hot water rating. First, get the total BTUH for that radiator with 200 degree hot water, based on what I told you, and remembering that I'm speculating (as are you) because we don't know the exact effect of the cabinet, and convert that to EDR (210 BTUH per sq. ft. EDR). Then, adjust the value to the same EDR at steam temperature. That would be 240 BTUH per sq. ft. EDR.

John Mills_3

Thanks Dan

my dry head moves a bit slowly on these wet issues We'll see what we can calculate now!