The couple is building new and going for MN Powers "Triple E" new construction program : http://www.mnpower.com/powerofone/one_home/new_construction/
>From the web-site: Homeowners and builders can qualify for special incentives up to $2,000 by meeting specific energy standards. These standards<http://www.mnpower.com/powerofone/one_home/new_construction/tierstandards.htm>cover thermal integrity (insulation, windows and doors, exterior wind barriers), airtight construction, moisture control, appliances, lighting, ventilation and heating system performance for air and water. Homes built to Triple E standards provide the homeowner with lower energy costs, a healthier indoors, improved building durability and increased market value. Hear from people who have built qualifying Triple E homes<http://www.mnpower.com/powerofone/one_home/new_construction/buildingup/November06BuildingUp.pdf> . With electric HW and the boiler, they dont have enough roof space (40W X 32H with shading issues on lower portion) to do what they want. I know so little about heat pumps, I dont feel I have the knowledge to reccommend. The home is 60-70feet from the Rainy River to the front and there in zero space behind the home. The lot is 75-100 feet wide. I think it is past the time for heating changes..... I was only called in to deal with possible PV. Jesse On Sun, Aug 28, 2011 at 6:30 PM, Darryl Thayer <daryl_so...@yahoo.com>wrote: > If this is a new house someone should have calculated the design heat > loss. Or the UA if you know the loss BTU per hour/degree F multiply by the > the dgreee Days, I would guess about 10,000, then multiply by 24 hours/day > So (heat loss(BTUh/DegreeF)xHDD about 10,000x24 h/d)= annual heat loss in > BTU/yr. I find that when the house is built most of the time this is > close. For super insulated i find many times the heat loss is higher. > > I have worked on some net zero houses in Minnesota. > All the houses net zero, have a heat pump. A heat pump will reduce the > annual heating consumption to about 1/2 to 1/3 of electric resistance. > > Many people use the tax credit to pay for the complete heat pump > installation. BUT heat pumps are very limited in the output temperature. > The heat source can not exceed about 110 to 115 VERY Max, higher > temperature will require electric resistance. The heat pump can heat hot > water to almost 130F using what is called a desuper heater. > > My net zero experiance finds that the PV takes up so much space they can > not affort solar thermal. Suprizing as this may sound, PV for heat pump and > heat pump for hot water and space heating. > Darryl > *From:* Jesse Dahl <dahlso...@gmail.com> > *To:* RE-wrenches <re-wrenches@lists.re-wrenches.org> > *Sent:* Saturday, August 27, 2011 2:57 PM > > *Subject:* Re: [RE-wrenches] Electric boiler usage? > > Wrenches, > > I've talked to the homeowners today about the system. They are using > www.warmboard.com subflooring and are talking to the manufacturer about > boiler size and load. I'm hoping they have some data. Im guessing they > spec a boiler. Another factor we have here is dual fuel and off-peak heating > rates. > > This does seem tricky!! > > > Jesse > > Sent from my iPhone > > On Aug 27, 2011, at 8:50 AM, Ian Woofenden <ian.woofen...@homepower.com> > wrote: > > > > > Hi Jesse, > > > > If your client were mine, I'd be recommending a heat pump, which would > lower the electrical load significantly. It will be a larger up-front > investment, but will likely have a positive economic return, and an > immediate reduction in grid fossil fuel use. Whether air-source or > ground-source would depend on the climate and budget. If they were willing > to let go of the radiant floor delivery system, a couple of mini-splits > might do the job (depending on the climate). An HVAC contractor I work with > recently speced a single mini-split for a 1,000 sf home in our moderate > climate -- installed cost was $1,000. I'm putting a kWh meter on it, so > someday I'll have data. > > > > I strongly recommend that you have your client add a reconditioned kWh > meter (available for less than $50 from a couple of sources), so that they > have a measure of actual ongoing performance of whatever heating system they > decide on. > > > > Projecting your electrical usage for boiler or heat pump will be tricky, > since it will be based on your heating degree days and the overall R-value > of your house. Local heating contractors _should_ be able to give you an > estimate based on generalized tables. Sometimes they only work in dollars, > but converting to kWh is easy. But I don't think their estimate will be > specific to the heat gain/loss of that specific house, but just based on an > average and the cubic footage. > > > > I'll be interested to see what decisions are made and how it plays out. > > > > Ian > > > >> Wrenches, > >> > >> I am working with a family that wants to install a grid tied system that > will offset, as close as possible, 100% of it's electrical usage. We have > calculated for almost all the loads except the electric boiler. > >> Problem, they don't know which boiler they will be using. The home will > be 1800sq ft, it will have the in floor heat between the floor joists and > the joists will then be insulated with foil-faced insulation. > >> Has anyone calculated a boiler like this out for annual electrical > usage? > >> > >> > >> Thanks as always, > >> > >> Jesse > > > > -- > > Ian Woofenden <ian.woofen...@homepower.com>, Senior Editor, Home Power > magazine > > Subscriptions: $24.95 per year PO Box 520, Ashland, OR 97520 USA > 800-707-6585 (US), 541-512-0220 > > or download free sample issue at <http://www.homepower.com> > > _______________________________________________ > > List sponsored by Home Power magazine > > > > List Address: RE-wrenches@lists.re-wrenches.org > > > > Options & settings: > > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > > > List rules & etiquette: > > www.re-wrenches.org/etiquette.htm > > > > Check out participant bios: > > www.members.re-wrenches.org > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > > >
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