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Green Building Bible, Fourth Edition
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Renewable Energy: Exhuast air heat pumps

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  1.  
    • CommentAuthorBowman
    • CommentTimeNov 19th 2007
     
    Having spent another Sunday afternoon with the heating on, the fire blazing and the kitchen door open, while any eco-credentials I may have drift off in to the countryside with smell of roast lamb and the heat of the cooker, this mornings research turned up this:

    http://www.ochsner.com/

    Our next refurb, due to start in a couple of weeks is definitely having exhaust air heat recovery, and with gas unavailable, any thoughts?
    • CommentAuthortony
    • CommentTimeNov 19th 2007
     
    Don't put cooker extract into it what ever you do. Probably a heat exchanger on the exhaust air would be good enough as it will recover 80%+ of the wasted heat and the heat pump bit is too expensive to justify for only this application. By all means get a heat pump as well
    • CommentAuthortony
    • CommentTimeNov 19th 2007
     
    Don't put cooker extract into it what ever you do. Probably a heat exchanger on the exhaust air would be good enough as it will recover 80%+ of the wasted heat and the heat pump bit is too expensive to justify for only this application. By all means get a heat pump as well
    • CommentAuthorBowman
    • CommentTimeNov 19th 2007
     
    Hi Tony,

    We weren't going to, our plan was to have a high power recirculating cooker hood, then extract elsewhere in the kitchen. Built in dehumidifier in the bathroom which will also help boost the bathroom temperature a bit.

    With a load of extra insulation, draft proofing, energy saving bulbs, and A rated appliances expect to reduce electricity bills by 50% minimum, maybe as much as 66%
    • CommentAuthorPeter A
    • CommentTimeNov 21st 2007
     
    Hi Bowman,if you get a chance check out the NIBE or ISOEnergy sites for the Fighter Exhaust Air Heat Pumps.
    • CommentAuthorBowman
    • CommentTimeNov 22nd 2007
     
    Hi Peter,

    Yes we've looked at the NIBE as well, we also found this http://www.beyondpollution.com/products.htm at $400 US. At the moment though we're leaning away from the all in one solution mainly due to COP and ROI, basically we would be able to halve our heating bills/CO2 but that's about it while remaining largely reliant on fossil fuels. Our current (this week!) favourite is a Calimax 80/20 wood pellet stove/boiler, Navitron Solar, and a thermal store, with Villavent MHRV, about £6.5K before any grants. In theory we could cut our heating/DHW bills by 75% giving us a 5 year payback compared to LPG at current prices.

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