am I wasting energy like this

tanith

:rotfl: I understood every word of it :rotfl: thanks.......

Graham1

Sorry for the equations. All it really means is heat flow through a solid (the bedroom walls) is proportional to the temperature gradient (temperature difference inside to outside, divided by the wall thickness). By turning off the bedroom radiators the bedroom temperature is less and so the heat flow to the outside is less and less energy is consumed. The energy to heat the air inside the bedrooms is the same whether they are heated in the morning (when the c/h is turned on) or in the evening (when the radiators are turned from off to on).

tomstickland

The OP asked whether having unheated bedrooms would mean that the rest of the system would have to put out more heat due to the extra heat sink.

I say the answer is that having the bedroom radiators off will save energy as long as the door is closed.

If the bedroom is heated then there is heat loss to the outside world, but no heat flow throught he internal wall.
If the bedroom is not heated then you can treat the bedroom as a void half way through a double thickness wall. There will be less heat loss through a thicker wall and the void would be at half the temperature of the inside and outside. So the bedroom will receive heat from the rest of the house, but the overall rate of loss will be less than if the bedroom was heated. Neat eh?

chatta

tomstickland wrote:

The OP asked whether having unheated bedrooms would mean that the rest of the system would have to put out more heat due to the extra heat sink.

I say the answer is that having the bedroom radiators off will save energy as long as the door is closed.

If the bedroom is heated then there is heat loss to the outside world, but no heat flow throught he internal wall.
If the bedroom is not heated then you can treat the bedroom as a void half way through a double thickness wall. There will be less heat loss through a thicker wall and the void would be at half the temperature of the inside and outside. So the bedroom will receive heat from the rest of the house, but the overall rate of loss will be less than if the bedroom was heated. Neat eh?

Impressed me So leave them off with door closed

ailuro2

Is there room for a curtain that could be pulled over to stop the heat escaping upstairs a bit?
Or box in the stairs to make more of a barrier?

mikeywills

Tanith just a quick note,
the recommended temperature for a bedroom is 16 degrees, but it is 21 degrees for a lounge area. If you do not shut your bedroom door unfortunatley not only does the rising temperature make that room warmer, but the cool air from the bedroom is dropping into your lounge area, which if you have thermostats will cause your lounge/ open plan downstairs to pump out heat for longer than you need(unless your boiler is on a timer).
I would suggest that if you have your boiler set on a timer, put it on earlier in the evening, and switch it off some time before you go to bed at least 1 hour. If you find this still to warm, open a window in your bedroom after your heating has gone off to let the rising heat escape.
Wishing you a cool bedroom, soon.