[Greenbuilding] Windows

[Gennaro Brooks-Church]

>>>>Good question. People say my new kitchen layout needs a window over the sink, through a 2' north stone wall with outdoor insulation. I'd like to hang a flat-screen TV with an outdoor camera there, but why should it run when nobody's in the kitchen? I could turn it off along with the lights using a half-hour motion detector, but how can I turn it on without pushing a button to see the picture?>>>>>>>>>>>

you could always put a solar powered fish tank there :)

Gennaro Brooks-Church
Cell: 1 347 244 3016 USA
www.EcoBrooklyn.com




On Thu, Feb 19, 2009 at 7:22 AM, Nick Pine <nick at early.com> wrote:
> Benjamin Pratt writes:
>
>> ... As a non-engineer, I appreciate and admire nick's Math...  I was
>> actually thinking of getting him to help my argument that we need windows on
>> the south side of the building I work in, and how much they would save us in
>> the long run.
>
> NREL says the average daily max temp is less than 60 F from October through
> April in Eau Claire, WI, with 7759 F heating degree days (37/day) and 6990
> Btu/ft^2 of sun (999/day) on a south wall, so 1 ft^2 of U0.25 window with
> 50% solar transmission would save about 0.5x999-37DDx24hxU0.25 = 278
> Btu/day, or about 7x30x278 = 58.4K Btu/year, roughly $1, with natural gas at
> $2/therm.
>
> December is the worst-case month for solar house heating, when 790 Btu/ft^2
> falls on a south wall on an average 16.8 F day with a 25.3 high and an
> average daytime temp of about (16.8+25.3)/2 = 21.1, so 1ft^2 of U0.5
> twinwall polycarbonate air heater with 80% solar transmission would save
> about 0.8x790-6h(65-21.1)xU0.5 = 500 Btu/day.
>
> Gennaro Brooks-Church writes:
>
>> ... Why the hell are we using windows if energy efficiency is 90% of the
>> equation?
>
> Good question. People say my new kitchen layout needs a window over the
> sink, through a 2' north stone wall with outdoor insulation. I'd like to
> hang a flat-screen TV with an outdoor camera there, but why should it run
> when nobody's in the kitchen? I could turn it off along with the lights
> using a half-hour motion detector, but how can I turn it on without pushing
> a button to see the picture?
>
> Nick
>
>
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