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re: what i will do with my extra $200 per month?
16 aug 2005
wrote:
>...i don't care what they say abt the unvented ones. they are not only
>potentially dangerous....they will also create a lot of moisture inside
>the home form the combustion process
>
>you don't want that moisture nor that co potential either one. do you?
you might enjoy the moisture, as well as the extra heat. the lower heating
value of natural gas is 930 btu/ft^3. the higher value is 1027, 10% more,
with condensation.
warming outdoor air with average humidity ratio w = 0.0025 in january in
phila from 30 to 70 f makes the indoor rh 16%. if an average house leaks
224 cfm and an average family evaporates 2 gallons per day indoors, the rh
rises to 20%. if an average house with 400 btu/h-f of thermal conductance
and 600 kwh/mo of indoor electrical use burns 13.2k btu/h of unvented gas
for heat, that raises the rh to 29%.
more caulking helps too...
nick
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