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# Steam coil

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Member Posts: 1,418
I have a steam coil, the coil is used with a blower motor to blow hot air in a gymnasium, the coil is 2 x 18 x 36. And 4 x18 x 36. There both x 2 what is the Edr of the coil

• Member Posts: 998
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You will need to find out the CFM, how many rows of fins, how many fins per inch.
• Member Posts: 15,840
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Assuming this is hooked up with a steam trap, disconnect the condensate line after the trap. Run a temp copper line from the trap into a barrel of water and submerge the condensate line in the barrel. Weigh the barrel with enough water in it to cover the condensate line. Turn on fan and steam and run for 5 min and shut off. Weigh barrel and subtract barrel and water initial weight. Multiply weigh difference by x12. the answer will be the # of pounds of steam used per hour.

Multiply pounds of steam x 1000 to get btus. Devide by 240 to get square ft of steam or edr.

or do it the easy way and call the equipment mfg
• Member Posts: 1,418
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I’ll look for manufacturers plate on unit , they did just replace the fan
• Member Posts: 1,194
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Also will need ot know steam pressure, and EAT (entering air temp)

If you can determine CFM of the blower by looking up the fan curve from the mfg and checking amp draw and reference to the RPM of the fan wheel. Then use temp rise to determine BTU output.

(Delta T) * 1.08 * CFM = BTU/hr

Divide by 240 for EDR (depending on steam pressure)