On 06/05/2021 23:35, Rod Speed wrote:
Fredxx wrote
Rod Speed wrote
Fredxx wrote
Rod Speed wrote
Fredxx wrote
Rod Speed wrote
Robin wrote
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,

Because its true ?Â* Novel concept I realise.

as the chimney effect can sometimes be very good at providing a
good airflow.

They both have that. The difference is that the
horizontal radiators have the air moving over
much less of the radiator so the radiator has
more cold air moving over it and so you will
see more heat moving out of the radiator
into the airstream.

So at first sight it's not obvious which orientation is best.

Only for those who dont have a clue about the basics.

Only those with hindsight will think differently.

Wrong.

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.

But that isnt different with the two types of radiator.

What matter is the distance that the cold air at the bottom of
the radiator moves over before it gets to the top of the radiator.

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

Just did. And dont need a cite, just an explanation.

You haven't explained why a larger temperature difference within an
enclosed space such as a flue or the space around a radiator won't
create a bigger draught when we know the opposite is generally true.

This paper for instance:
Â* http://cit.edu.ly/wp-content/uploads/2018/02/15-091.pdf

University of Zawia, hardly one of the world's great universitys.

A preferred reference over one individual whose chosen speciality is
claimed to be chemistry.

Another of your bare faced lies. Your trademark.

My trademark is to cite the source of my accusations. You confirmed you
were a chemist in a thread titled "Ethanol".

If you can't recall then senility has crept up with you. Denial and
senility go together.

And they only use aspect ratios up to 2 and no verticals, so none of
that paper is relevant anyway.

It's infinitely better than any cite you've made to backup your claims.

No cite required with the basic physics at the front of the
radiator which is where most of the heat comes from and
it isnt a claim, its a fact with the length of the path of the
cold air from the bottom of the radiator, you pathetic
excuse for a flagrantly dishonest lying bull**** artist.

It is a fact that the aspect ratio of a radiator as well as the height
of the room vs radiator heigh determine the efficacy of a radiator. But
wider vs taller isn't always an optimum choice.

You are like T i m who resorts to abuse when their "facts" no longer
match real world examples, however hard they wish they did.


suggests the optimum aspect ratio of the radiator is highly
dependent on wall height.

Ah yes:

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