CH Radiator sizing

Hi,
I am going to be replacing my aging Central Heating system (30 years). The current radiators are just single panel and I am thinking od replacing them with double convectors to save space.
Can anyone tell me an easy way to work out what size radiators I need in each room, without employing a heating engineer to tell me.
Thanks
Jimmy
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On Mon, 26 Apr 2004 13:00:47 +0100, Jimmy Gibson

The radiator manufacturers have software that will do a reasonable job for you, Jimmy.
I've found the Myson one the best, but it's not on their web site right now. Is your email address correct? If so, I'll send you a copy.
Basically, you have to go round and measure each surface and feed the numbers in. It will calculate the heat loss for the room and you go from there.
.andy
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Hi Andy
Any chance of emailing me a copy
Thanks Paul.
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Andy Hall wrote:

My email is correct so you can email me a copy.
Many thanks - I kne someone would be able top help
Jimmy
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Andy Hall wrote:

Sorry, replied to wrong message and forgot to change email addr.
My email is corrct so you can send a copy by email.
Thanks very much.
Jimmy
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On Mon, 26 Apr 2004 16:39:38 +0100, Jimmy Gibson

On its way, and to Paul
.andy
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| | | >My email is corrct so you can send a copy by email. | > | >Thanks very much. | > | >Jimmy | | | On its way, and to Paul | Any chance someone could forward a copy to me too? I've been using the web based calculator on the B&Q website for rough sizings but have no way of telling how accurate the results actually are.
E-Mail address is: seri (at) dextrous (dot) net (I hope that doesn't open the floodgates of spam)
Many many thanks in advance
Seri
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wrote:

In the post, although what Hotmail will do to it is another matter!
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Years ago, Stelrad gave away a free program (MS-DOS based) that calculated your heat loss, and told you the BTU each room required, as well as offering boilers to suit.
I just had a quick look on the web, and they are charging 20 for it on CD at the moment.
I also remember at our local Plumb Centre they had a cardboard wheel calculaty thingy for calculating radiator sizes. I am sure the nice man at your plumb centre or other supplier would let you use theirs if you were buying from him.
I might have a copy of the old Stelrad program lurking in an old box of disks somewhere...
You could also have a search on the web for "heat loss calculation program". There are a few expensive programs that have free demos available. If they are limited to 1 use, or 30 days, it would be ideal for you.
Bob
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http://www.radcalcs.com /
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On Mon, 26 Apr 2004 16:48:46 +0100, "Mistatee"

Unfortunately this site typically comes up with very inaccurate answers :-(
.andy
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wrote:

Oh yes indeedy! :((
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too high, too low or just crap ?
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dave @ stejonda

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On Mon, 26 Apr 2004 17:38:54 +0100, "dave @ stejonda"

The latter two. Couldn't make up my mind between them.
Fortunately I didn't go out to buy on the strength of it. :)
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On Mon, 26 Apr 2004 17:38:54 +0100, "dave @ stejonda"

Dave, I've replied to your email with the Myson attachement as a ZIP.
.andy
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wrote:

If your old radiators provide sufficient heat, replace them with new ones of similar output. I was once given rule-of-thumb estimates for old steel panel designs (unfinned) of 400btu/ft2 for singles and 600btu/ft2 for doubles. These rough estimates were at a temperature difference of 100F. Conversion to kW, m2 and deltaC left as an exercise for the reader.
Note that if you intend to fit a condensing boiler, you should base any calculations on cooler water temperatures. I forget the exact figure that is used, but it shouldn't be too hard to find. (It might be 70C against 80C).
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Jimmy Gibson wrote:

Thanks to everyone for the useful links,info and software(Andy)
Jimmy
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