Electric radiant heating

First test with a mat 150W/sqm: disappointing... it gets a bit warm, but there is hardly any radiant heat. The test piece will soon be moved under my desk at the exterior wall.
Something like that only works with well-insulated walls, it's not enough as a radiant heater.

There are also these mats with 250W/sqm... maybe more can be achieved with that.

Or I let them run on 400V then the power increases by a factor of 1.7... so a maximum of 434W/sqm would be possible, which is almost three times as much as tested above. Then it should work, but you probably also have to dissipate the heat and fully glue the mat down to stabilize it so it doesn’t deform. For example, stick it onto an aluminum plate with heat-resistant contact adhesive or similar.

I can already hear the outcries but stay calm: 400V is just electricity (ouch...). It’s all a question of duty cycle or actual heating. The conductors just must not overheat, that’s all.
Any ordinary hairdryer would burn out in seconds if a strong airflow did not cool the heating coils.

Regards,
Dirk

First test with a 150W/sqm mat: disappointing... gets a bit warm, but you can hardly speak of radiant heat.

I The workshop probably needs more than 120 watts/m². ...... But with 650 watts at 35m² I hardly believe you'll notice anything from the heater at all.

Was somehow to be expected

I can already hear the outcries but stay calm: 400V is just electricity (ouch...). It's all a question of duty cycle or actual warming. The conductors just must not overheat, that's all. Any banal hairdryer would burn out in seconds if a strong airflow didn't cool the heating coils

If your Horst wouldn't constantly obstruct, then the big power lines to the south could also be built. Then you can certainly tap more than 400V. You just need an extremely large fan so that the small mats don't overheat

I kick "our" Horst hard where the sun never shines whenever I see him... especially if Drehofer eventually has the route laid over our house, you never know with that guy... but then I'll build a receiving coil under the roof and heat with the alternating field

But I actually briefly considered just slapping modules on the roof and using the electricity for heating... well, I came back from that idea after about 1.5 seconds because that stuff doesn't produce power in the dark or bad weather and anyway, that's obviously economic nonsense.

Trial makes wise let's see when I take the next step, at the moment other things dominate.