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CALCULATING BTU OUTPUT OF CAST IRON RADIATORS WITH HOT WATER
K HAYNES
Member Posts: 10
TRYING TO FIGURE OUT THE BTU OUTPUT OF MY CAST IRON RADIATORS. THEY ARE CURRENTLY USED WITH STEAM BUT IM GOING TO INSTALL A NEW BOILER AND USE THEM FOR HOT WATER. THEY MEASURE AS FOLLOWS 38" HIGH AND 5 TUBES PER SECTION . THE SYSTEM IS DESIGNED WITH A 180 DEGREE TEMP WHAT IS THE OUTPUT PER SECTION WITH THESE ANY HELP WILL BE GREATLY APPRECIATED
0
Comments
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Sections
How many section of radiator are there.A picture will help.0 -
The BTU
output for steam rads is 240 sq/ft.
HW in the same rads is another matter that depends on the water-temperature.
This can only be determined by a complete HL calculation.
180 is a pretty high design temp to use, the lower temp you can get away with, the more efficient the boiler you can use.
However, here`s some info from Burnham that should help determine what you have.
Dave0 -
From Burnham's table
Compared to 215°F (0.9 PSI) steam at 240 BTU/SF
@ 180°F: 170 BTU/SF (71%)
@ 170°F: 150 BTU/SF (62%)
@ 160°F: 130 BTU/SF (54%)
@ 140°F: 90 BTU/SF (37%)
@ 120°F: 50 BTU/SF (21%)
For 38" 5 tube slenders assume 5 SF/section at 215°F Steam, so 3.5 SF/section at 180°. 3.1 @ 170°, & 2.7 @ 160°.
Full structure heat loss calc should tell you how low you can go in water temp. w/ the existing radiation.0 -
nbc
Is that not what I posted in PDF?,, sheesh.
Dave0
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