Getting more from radiators

I am the most humorous and funniest person in the world.

Reply to
IMM
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Yeah, right.

Reply to
Phil Addison

They're not laughing *with* you, you know.

Reply to
Huge

Thank You.

Reply to
IMM

IMM burbled fatuously:

And you always tell the truth as well.

My my!

Reply to
The Natural Philosopher

In message , IMM writes

Still not got the hang of grammar though have you

Reply to
geoff

I am also the most honest person in the world too.

Reply to
IMM

I am the most literate person in the world.

Reply to
IMM

Now its fairly obvious how to easily calculate the size of the world that IMM lives in. Bringing a whole new slant to the catchphrase 'its a small world innit?'

Reply to
The Natural Philosopher

How big is Mars, now have had a stroll around it?

Reply to
IMM

(with a bit of cut and paste)

Reply to
Dave Plowman

In message , IMM writes

But not in the real one which the rest of us inhabit

Reply to
geoff

Maxie, I don't go to Mars.

Reply to
IMM

In article , Andy Hall writes

On the eco-hometec web site they claim that the maximum a 15mm pipe can carry is 9Kw - but we don't know if a condensing boiler is fitted. If not then the same web page states 4.25 Kw maximum at 1.5m/s flow.

Reply to
Andrew

In message , IMM writes

So why did you start going on about it?

Reply to
geoff

The suggestion of 9kW is not directly as a result of having a condensing boiler but because it *may* be possible to design the system around 70 degree flow and 50 degree return temperatures. However, for this to be possible, the radiators have to be derated to a factor of 60% of the data sheet value as opposed to the 89% or so for a conventional 82/70 degree system. That is not to say that a condensing boiler won't work if it is directly replacing an older 82/70 degree boiler. Typically it will increase its flow temperature accordingly when required to cover worst case weather conditions. However, the temperature drop may not be as much as 20 degrees any more and hence the heat transmission through the pipes is less. Heat output from the radiators is increased in this scenario because the mean water to air temperature is higher. Some condensing boilers can have their operating temperature limits set for different applications. For example on mine, I can set for

55, 70 or 85 degree maximum flow temperatures for UFH, condensing design or conventional design heat emitters.

The 6kW figure is given as a starting point in HVAC design guides as well as white papers on the Copper Development Association web site using a few metres of pipe. The CDA design guide then suggests, as I have done, to do the sums if the load is close to this figure. I tend to do the calculations as a matter of course if I am putting on radiators of capacity more than about a third of the rule of thumb number. It is a simple matter of looking up the numbers in tables and some addition and multiplication.

.andy

To email, substitute .nospam with .gl

Reply to
Andy Hall

Has somebody just farted.

Reply to
Hammer Chewer

No they are not.

snipped-for-privacy@hotmail.com is not snipped-for-privacy@easy.com

Reply to
Steve Firth

How do we know? We are not in your house.

Reply to
IMM

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