Poll: Heating Concepts

[Harry Bloomfield]

Eh?

You seem to be querying how UFH works?

 

[EFLImpudence]

I've repeatedly said that thermostat location appears to be crucial to everything we've been discussing but, despite my having repeatedly asked the question, no-one has yet told me where the thermostat is in a Willi system,

That wouldn't take much searching.
It's in the Willis, which is just an immersion heater in a tube.

so I have been guessing/assuming that it is within the Willis heater.

Of course.

If so, the situation is identical to that with an internal immersion, with the stat switching off the heating when the desired water temp gets level with the Willis.

No it isn't. It is dependent on the temperature in the tube; not in the cylinder.

One variant of 'common sense' would tend to agree with that.

Then use that variant.

However, if that's what happens, I presume it would have to be (probably slowly) by conduction, since I can't see why ('by convection') heated water should fall through the cooler water below the heater?

So what? If some hot has risen then some other not quite so hot must fall.

As above, if the Willis has a thermostat (which I strongly suspect that it probably does), then I see no difference from any other immersion+stat.

Because the Willis gets a supply of water from the bottom of the cylinder.

 

[EFLImpudence]

When this is settled, are you familiar with magnetism?

 

[ericmark]

Warm air, or water, rises. The heat source is in the floor, the floor area will be warmer the air above it, therefore it will rise. The air current will be rising in the middle, because the walls will be cooler. Basic common sense, in my view!

Good point. Looking at round houses

your answer is clearly correct. Which is why I selected "it depends" also with under floor heating the air current would be up in the centre and down the sides.

Centre of house, internal wall of living room, we have an open fire. I have made a unit to connect it to the AC, so no need to open a window in the summer for the exhaust, it has never been used by me to heat the house, main problem is air goes up the chimney and is replaced through every crack and gap in all doors causing drafts, as there is no ducting for combustion air, so it is for emergency use only as a fire.

The room has two radiators at 90° to each other on outside walls, under windows, not ideally placed, but they work, both with electronic TRV heads which do not connect to the wall thermostat, which clearly can't be opposite to both of the radiators, and the room L shaped, so no ideal place for either radiators or wall thermostat, but it works.

I have no idea how the air circulates, it clearly does, but at moment thermometer on table 21.3°C wall thermostat 21°C (only shows in 0.5°C increments) radiator behind me 20°C (only shows in 1°C increments) and other radiator 17.2°C behind a settee, and been a warm day today, so heating has not been running. The room below living room showing 17.8°C. There is a lot if insulation between the rooms, as it was a garage. In the main today room has been heated with inferred from the sun, so warmer than the rest of the house. Wife's bedroom North side of the house, 15°C with so many easy read temperatures my bedroom 19.1°C and the utility room unheated 13.8°C and hall 15°C TRV and 18°C wall thermostat, and dinning room 14°C on the TRV the rest do not connect to phone or PC, there is with the heating not running a huge variation throughout the house. Even within the same room. Some can be explained away by height of the sensor, or proximity to outside, but my feet are not cold, so the air clearly does circulate to some extent.

 

[Harry Bloomfield]

When this is settled, are you familiar with magnetism?

Pleeeeaaase, not another endless thread!

 

[ericmark]

When this is settled, are you familiar with magnetism?

ELECTRIC LOVE
My love is like a dynamo
With woven wire for hair,
And when she brushes it at night
The sparks run crackling there.
Oh she is the magnetic field
In which I pass my days,
And she will always be to me
ELECTRIC in her way.
No insulated force is she;
Galvanic rather , seeing
Hers is the current keeping bright
My filament of being
Oh yes,my love's a dynamo
Who charges all the air ;
My love is an Electrolux
Who sings upon the stairs..