Onetap :
On Nov 24, 3:26*pm, jgharston wrote:
Money Box Live on the Radio. Started with the announcer saying:
"As winter comes, households will be turning up the heat".


Agh!!!!!

Why does whatever you set the heating to in July suddenly
become too cold in December? *IT'*S *THE* *SAME* *FECKING*
*TEMPERATURE*!!!!!!!!!!!!


Journalists' nonsense or a figure of speech, but not incorrect.

Thermostats work on the air temperature which could, given an ideal
heating system, remain constant at, say, 21 degC.

Human comfort is based on heat losses by convection (air temperature),
radiation and cooling by evaporation. So, in cold weather, the
surrounding radiant surfaces (walls, floors, ceilings) are colder so
you feel colder although the air temperature stays constant. You lose
more heat by radiation. ISTR that human comfort conditions are best
controlled by a temperature sensor in a b;ack ball of about 6"
diameter; can't recall what it's called though.

There's also the effect of air movement. When it's cold outside and
there's a hot radiator pumping out heat, the air moves around quite a
lot. That movement affects human comfort but has no effect on a
thermostat. The colder it is outside, the more air movement there is.
The effect is quite pronounced in this house where the radiators were
all installed on the walls opposite the windows, and still noticeable
with the more usual arrangement of radiators under the windows.

--
Mike Barnes