On 06/05/2021 17:40, Rod Speed wrote:


"Robin" wrote in message
...
On 06/05/2021 12:55, jon wrote:

What is this nonsense, heat is dissipated by radiation, convection or
conduction so how come efficiency becomes a problem.

As I think I said the last time this came up, my physics is nowhere
near good enough to decide "by inspection" whether a vertical or
horizontal radiator is better at transferring heat to a room.

Yes, you clearly have that problem. Plenty of us dont.

I don't know why you say that, as the chimney effect can sometimes be
very good at providing a good airflow. So at first sight it's not
obvious which orientation is best. Only those with hindsight will think
differently.

And (like some others)

Who have the same problem.

I saw too many /known/ unknowns - e.g laminar flow? temperature of air
exiting top? chimney effect? - quite apart from the possible unknown^2

None of that matters. What matters is the vertical distance.

There is no chimney effect with a radiator.

The gap between the radiator and the wall and radiator height will
determine air speed over the radiator.

If you think differently, please feel free to cite an explanation why
this isn't the case.

Ah yes:

https://groups.google.com/g/uk.d-i-y...m/lwVTe0U-U3YJ