I'm trying to build a well-insulated and airtight bungalow. I will be putting a large wood-burning stove in, it will have a free standing flue going up through the ceiling and continuing ten foot until going outside. I was wondering if I coiled the intake pipe from the HRV round the flue would it heat the incoming air up?
I'm also incorporating four velux sun tunnels which use a small velux window 355mm diameter reflective tunnel to channel day light from the roof to the ceiling. I was wondering if I could capture any heat stored in these tunnels to be used in the HRV?
Any thoughts on this would be appreciated.
Thanks
Phil
Tonnot
posted on 07-01-07
have you considered a rocket stove?
these things are meant to be extra efficant.
Phil
posted on 07-01-07
Thanks Tonnot
Sorry new to all this. Is there a web site on this or could you tell me a bit more so i can search for it.
Phil
Tony
posted on 07-01-07
Yes you can recover heat from the flue pipe. There are down sides as this will cause the flue to both condense tar and water.
The light tubes you have in mind are a real waste of time except in very hot climates where you want light but not heat. Have a think about proper roof windows and light wells. It would not be practical to try to recover heat from either the tubes or the wells.
Bernard
posted on 07-01-07
Quote "" I was wondering if I coiled the intake pipe from the HRV round the flue would it heat the incoming air up? ""
If you heat the incoming air by cooling the flue you may reduce the thermal induced air flow below the minimum required for efficient combustion.
fostertom
posted on 07-01-07
Yes, best to seek a stove that's designed to do its extracting within the stove, taking max practicable heat out of the combustion gasses leaving just enough for reliable adequate flue 'draw'. Extract any more heat e.g. from the flue and there won't be enough gas buoyancy to create adequate draw. Some stoves are built into a brick core of the house which has airways that extract much of the heat effectively from the flue, but it's all carefully designed.
Another thing to seek is a closed stove that draws its combustion air from outside, not from the house's air space. The latter plays havoc with any attempt at a sealed/balanced heat recovery ventilation system.
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