[Greenbuilding] Shipping container home

[Sacie Lambertson]

Does look like a lovely space.  Are those shipping containers insulated?
If so, must not be much there.  I love leaving the exterior as was.

Sacie


On Fri, Nov 29, 2013 at 11:26 AM, Benjamin Pratt <benjamin.g.pratt at gmail.com
> wrote:

> Don't know the details of it's construction. But it looks like a nice
> space.
>
> http://www.offgridworld.com/ugly-duckling-shipping-container-home-built-by-artist-is-a-beautiful-swan-on-the-inside/
>
>
> On Tue, Nov 19, 2013 at 7:26 AM, nick pine <nick at early.com> wrote:
>
>> Sean Rauch wrote:
>>
>> -We live in Manitoba Canada and plan to build just outside of Winnipeg
>>
>> http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/
>> International/pvwattsv1_intl.cgi says 3.13 kWh/m^2 (992 Btu/ft^2) of sun
>> falls on a south wall on an average December day in Winnipeg.
>>
>> The stat file at http://apps1.eere.energy.gov/buildings/energyplus/cfm/
>> weather_data3.cfm/region=4_north_and_central_america_wmo_
>> region_4/country=3_canada/cname=CANADA says the average December temp is
>> -14.1 C (6.6 F) with a -12.1 high.
>>
>> -I'm working with a model right now that has 2000 square feet of living
>> space spread out over two floors
>>
>> ... eg 32'x32'x16'-tall, with a 1024 ft^2 ceiling and 2048 ft^2 of walls.
>>
>> -We're planning the basic south facing windows with thermal mass inside
>> to collect as much winter sun as possible.
>>
>> That could work. If the house has no internal heat gains and it's 75 F on
>> an average day and 65 after 5 cloudy days in a row (with a 2^-5
>> probability), 65 = 6.6 + (75-6.6)e^(-5x24/RC) makes time constant RC = 759
>> hours. With US R30 walls and an R60 ceiling  and  R30 night- and cloudy-day
>> window insulation and a 1/R = G = 1024/60+2048/30 = 85 Btu/h-F cloudy-day
>> conductance, it would need C = 759hx85Btu/h-F = 64.8K Btu/F of room temp
>> thermal mass, eg 64.8K/25 = 2591 ft^3 of concrete or 4048 ft^3 of
>> cylindrical rock gabions, about 25% of the house volume, or more, with less
>> night window insulation.
>>
>> -The house wont be off grid but I don't want to rely on the grid for any
>> of the climate control demands of the house.
>>
>> It might have a shiny massy ceiling heated by passive air heaters, with a
>> thermostat and a slow low-power ceiling fan to mix down hot ceiling air as
>> needed to keep the house exactly 70 F for 5 cloudy days, or 70 F during the
>> day and 60 at night. Here's a nice air heater:
>> http://www.builditsolar.com/Projects/SpaceHeating/solar_barn_project.htmWith hot ceiling air and colder air outdoors, you might use R2 twinwall
>> polycarbonate with 80% solar transmission instead of a single layer in
>> balmy Montana. Gary Reysa and I tried this scheme in 2010, with one big
>> mistake, an uninsulated partition wall that turned the air heater into an
>> air cooler at night... http://www.builditsolar.com/
>> Experimental/dCube/Barra/BaraBox.htm
>>
>> With no windows (use flat screen TVs and outdoor cameras), the house
>> would need about (65-6.6)85 = 5K Btu/h or 119K Btu/day (collect 20K Btu/h
>> for 6 hours) or 596K Btu for 5 cloudy days in a row. At (say) 160 F, a 1
>> ft^2 twinwall air heater would gain 0.8x992-6h(160-6.6)1ft^2/R2 = 460 Btu
>> on an average day, so the house could have 119K/460 = 260 ft^2 of air
>> heater glazing, eg an 8'x32' south wall. A 1024 ft^2 ceiling with a 3
>> Btu/h-F-ft^2 slow 2-sided airfilm conductance would be about
>> 20KBtu/h/3KBtu/h-F = 7 F cooler than the hot air around it when collecting
>> heat on an average day, and a 5.5"x32' air heater flow path with A = 14.7
>> ft^2 and H = 8' would make the air heater air
>> (20K/(16.6x14.7sqrt(8)))^(2/3) = 9.4 F warmer than the air near the
>> ceiling, so the ceiling would be 160-9.4-7 = 144 F on an average day.
>>
>> A 1000 cfm ceiling fan could keep the house 70 F with a
>> 70+5KBtu/h(1/3K+1/1K) = 77 F ceiling, and (144-77)C = 596K makes C = 4.3K
>> Btu/F for 5 cloudy days in a row, ie 4.2 psf, eg 0.8 inches of water, or
>> deeper water in trays that cover less ceiling surface.
>>
>> Have fun :-)
>>
>> Nick
>>
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>
>
>
> --
>
>
> b e n j a m i n p r a t t
>
> professor art+design
> the university of wisconsin stout
>
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