alternative to tricle vents, which co doent like!

[skier-hughes]

Excellent one Gareth, and also very easy to visualise.

 

[Gareth Hughes]

Interestingly, section 3 of the approved document does contain some advice that seems almost sane about historic buildings

And the glossary to the document defines "historic building" as, among other things, "vernacular buildings of traditional form and construction" which opens a pretty wide field for exemptions.

 

[Nemesis]

Try convincing the local BCO though...

 

[Gareth Hughes]

Try convincing the local BCO though...

It's quite simple - you just open the document at that page, and hit him over the head with it...

 

[Nemesis]

Aren't they made of wood though?

Will it have any effect?

 

[Penners]

Aren't they made of wood though?

Sorry, do you mean the document or the BCO?

 

[Nemesis]

The BCO.

 

[Gareth Hughes]

Small diameter holes drilled horizontally (from the inside face) to half the thickness of the opening light frame, meeting similar holes drilled up from the underside of the frame, making an inverted "L" shape in cross section which bypasses any draught sealing between the frame and the opening light. Our BCOs have accepted it.
(sorry, it's a bit difficult to describe without a drawing)

I should have said that it's also possible (and easier in many cases) to produce the same arrangement through the fixed head of the window frame - which has the advantage of introducing a draught where none but the very tall will be bothered by it.

 

[Penners]

No matter how diligent we strive to be in conserving the heat within our houses, there is no way of avoiding the need for ventilation.

Do you think there's any way of creating an effective ventilation system that also conserves all the energy that's been used to heat the building?

I know you can fit ventilation systems that include a method of heat recovery, but I wonder whether they do, in fact, recover more energy than they expend in carrying out their function.

Just idle musings...

 

[worms]

I wonder whether they do, in fact, recover more energy than they expend

From http://www.thermsaver.co.uk

As a guide, a typical system operating in Scotland from September to May continuously at 100 cubic metres per hour, would recover 2000 kilowatts with a fan running cost of 800 kilowatts, showing a net saving of 1200 units

I guess it also depends on the cost of the input energy in the system - if you are heating with home produced logs, then the 2000 Kw recovered might be worth less than the 800 Kw electricity used and at the other end of the scale if you are heating with electricity there is potentially a large saving. I'm not sure where the trade-off would be at the moment for those on gas or oil.

 

[bower1]

I've have a heat recovery vent fitted for the last 6 months. No idea if it works as I've had to block it up. Far too noisy in the wind. Typical.

 

[Essex]

Look at BedZed cowls with with passive heat recovery, could be quite fun atop a listed building!!!

 

[Penners]

I'm not entirely convinced that the Conservation Officer would agree with you!