[Greenbuilding] Slab heat loss calculation

Alan Abrams alan at abramsdesignbuild.com
Mon Aug 26 17:41:17 CDT 2013


sorry, that should be 4.75 *kilo*BTU's/SF/yr, etc...

AA


On Mon, Aug 26, 2013 at 5:40 PM, nick pine <nick at early.com> wrote:

> Alan Abrams <alan at abramsdesignbuild.com> wrote:
>
>  the Current Project calls for 9" of subslab geofoam rated at R-4.2 per
>> inch, and clocks in with a specific space heat demand of 4.75 Btus/SF/year.
>> The house contains 1735 SF of *treated* floor area...
>>
>
> 4.75x1735 = 8421 Btu/year, ie 8421/100K = 0.0824 therms per year.
>
>
>  changing to 2" of foam increases the SSHD to 5.90 Btus/SF/year, requiring
>> about 20 additional therms of natural gas to make up the difference.
>>
>
> 5.90x1735 = 10237 Btu/year, ie 10237/100K = 0.102 therms per year.
>
> Nick
>
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-- 
Alan Abrams*
**certified professional building designer, AIBD
certified passive house consultant, PHIUS*
*certified passive house builder, PHIUS**
*Abrams Design Build LLC
*sustainable design for intentional living*
cell     202-437-8583
alan at abramsdesignbuild.com
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