Trying to identify and rate this convector
Mid 50s, cabinet 36 in L, 24in H, element 2inH x 5.5inD. 6-7fins per inch. Seems to be three tubes inside. Put a magnet to the fins, no reaction, so I'm thinking aluminum? Trying to get btu rating at 180deg.F. I'm thinking around 4000? Can't find this in Dan's book, anyone recognize it?
This post was edited by an admin on July 10, 2012 9:59 PM.
Thanks
Thanks for digging that out. Seems very similar except for the air vent assembly if you look close up, and heat output grills which are shorter on our convectors, but the measurements seem right on. Don't know if the EDR is constant whether steam or HW. Apparently you mulitplied the EDR by 180 and got the 6000+ number. Doesn't say copper so I'll assume aluminum if they were making them in the 50s. Thanks again.
Pipes are copper...
Fins are aluminum.
The EDR for hot water is 150 per square foot. The 180 assumes steam.
If that is an old Trane convector, attempting to convert it to hot water will cause it to sing due to restrictive orifice in the return.
ME
It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
HW
Thanks Mark, system is and will remain HW. I guess they use 150 as an average water temp --160 supply, 140 return(?)--not always easy to compare apples to apples with various manufacturers emitter ratings. some don't give EDR, just btu/hr at 180, 190, etc.
Yes, and no...
The EDR is Equivalent Developed Radiation, which is expressed in square feet of heat emitting area. When using hot water, with an average temperature across the emitter of 180 degree F water, then each square foot of EDR will emit 150 btu/sq ft/hr.
When used with steam at around 212 to 215 F, that EDR output number jumps to the 180 btu/hr/sq ft.
Didn't want you to be confused. Average fluid (yes, steam is considered a fluid) temperature and EDR output have some similar numbers, but mean different things.
If the convector WAS originally a Trane steam system, they had a 1/4" restrictive orifice in the outlet, that when you force water past it, causes it to whistle (Thanks Frank) like a train (Trane?)
ME.
It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
Great explanation
Thanks alot.
to befuddling things a bit
Mark my charts have 240 btu's per square fot for steam and 170 btu's for 180 degree hot water. If it had been used for steam and you are converting it to hot water make sure it has been well tested for corrosion ans for restrictors as Mark stated.
Cost is what you spend , value is what you get.
Opppss...
Charlie is correct. I have WAY too many numbers bouncing around in my head, and am getting too old to be trying to recollect from memory...
http://en.wikipedia.org/wiki/Equivalence_of_direct_radiation
Thanks for the catch Charlie.
ME
It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
No problem Mark
Thats why we all have bookshelves, they keep track of things better then we do. c
p.s. I double checked before I said anything incase I was wrong.
Cost is what you spend , value is what you get.
De-rating from being recessed
Then of course the EDR ratings probably don't take into account fully or partially recessed units. Or do they? Mine is 2/3 recessed. Back metal wall of cabinet is probably right up against the 3/4in sheathing. Got to be at least a 20% loss from that, eh? Seems like convectors and cousin baseboard inherently require relative short-cycling; give me cast iron any day.
This post was edited by an admin on July 10, 2012 9:59 PM.
