Ok I have had a good look around, and I cannot find the answer, so I am
hoping someone here can help.

I have a radiator in the dining room, currently it has a twin entry
valve, this valve is leaking, I have shut it off for now but I will have
to replace it, extending one leg to the far end of the radiator, and
fitting a TRV. This radiator is fed from a manifold upstairs, and I am
not sure where exactly, and I would rather not have to lift carpets etc
to find it.

But at the same time I replace the valve, I want to add another radiator
on the other side of the wall in the living room, and want to know if
the 10mm copper pipe will supply enough heat.

What is the heat capacity of 10mm copper pipe?

thanks

Vernon

On Oct 13, 4:40*pm, Vernon wrote:
Ok I have had a good look around, and I cannot find the answer, so I am
hoping someone here can help.

I have a radiator in the dining room, currently it has a twin entry
valve, this valve is leaking, I have shut it off for now but I will have
to replace it, extending one leg to the far end of the radiator, and
fitting a TRV. This radiator is fed from a manifold upstairs, and I am
not sure where exactly, and I would rather not have to lift carpets etc
to find it.

But at the same time I replace the valve, I want to add another radiator
on the other side of the wall in the living room, and want to know if
the 10mm copper pipe will supply enough heat.

What is the heat capacity of 10mm copper pipe?


In my view the limit on pipe diameter is that you don't want the flow
velocity to be more than about 1 m/s so that the system is quiet. A
10mm pipe carries 0.080 kg/sec at 1 m/s (dropping pressure at 1,500 Pa/
m) http://www.cda.org.uk/megab2/build/tn39/appb1.htm

IIRC, You need about 0.100 kg/s for 4kWatt of radiator.

So, I'd say, if your two rads add up to less than 4kw in total you'll
be OK.

Robert

RobertL wrote:
On Oct 13, 4:40 pm, Vernon wrote:
Ok I have had a good look around, and I cannot find the answer, so I am
hoping someone here can help.

I have a radiator in the dining room, currently it has a twin entry
valve, this valve is leaking, I have shut it off for now but I will have
to replace it, extending one leg to the far end of the radiator, and
fitting a TRV. This radiator is fed from a manifold upstairs, and I am
not sure where exactly, and I would rather not have to lift carpets etc
to find it.

But at the same time I replace the valve, I want to add another radiator
on the other side of the wall in the living room, and want to know if
the 10mm copper pipe will supply enough heat.

What is the heat capacity of 10mm copper pipe?


In my view the limit on pipe diameter is that you don't want the flow
velocity to be more than about 1 m/s so that the system is quiet. A
10mm pipe carries 0.080 kg/sec at 1 m/s (dropping pressure at 1,500 Pa/
m) http://www.cda.org.uk/megab2/build/tn39/appb1.htm

IIRC, You need about 0.100 kg/s for 4kWatt of radiator.

So, I'd say, if your two rads add up to less than 4kw in total you'll
be OK.

Robert


Robert,
Thanks for that, I will have to check, the radiator in the dining room
is 700x1600 double panel but no convectors. Not sure what the output is,
but got to be close to 2.5kw?

In an earlier contribution to this discussion,
Vernon wrote:

Thanks for that, I will have to check, the radiator in the dining room
is 700x1600 double panel but no convectors. Not sure what the output
is, but got to be close to 2.5kw?

The rule of thumb I use for double unfinned rads is 2170 watts/M^2 at
dT=60 - which would give about 2.4kW (or less at a lower dT value).
--
Cheers,
Roger
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