I am curious about the zone map developed by LBL that is used for calculating Building Tightness Limits (BTL) The map is ubiquitous, but pretty crude. It certainly doesn't correspond to avg wind…Continue
"In the North, when the heat is needed most is at night and on colder, cloudy days. PV won't work, hence storage is necessary. Tons of batteries, or water thermal or masonry thermal. How much? depends on the house and the weather. This is a…"
"All well and good, but you still have to come up with solutions to provide electricity, space heat/cooling and HWH during the worst months of the year. I'm in a Northern heating climate so I've thought about this a lot. Seasonal…"
"I did a Web search on this recently;
NEC prohibits covering K&T with insulation. Must maintain a 3" air gap. Some states, under the auspices of Bonneville Power, have amended that rule; Calif, OR, WA, ID and also Nebraska.…"
"Good list. I'd like to comment on Myth #1 about registers.
Closing registers (and bedroom doors) will change room-to-room pressures and will also reduce airflow across the heat exchanger of the furnace.…"
"If you compare the energy codes of the late 1970s to the 2012 IECC you get this for Zone 6: Ceilings, R-19 to R-49, Walls, R-11 to R-25, Basements, R-0 to R-19, Windows, U-.5 to U.32, Air leakage, no requirement to 3ACH, Lighting, no…"
"The IBC is upgraded every 3 years nationally, as is the IECC (International Energy Conservation Code). Each state has the option of adopting these new codes. Currently, most states are using the 2006 or 2009 IECC. The 2012 code has been…"
"James, here's what I meant about masonry stoves or radiant floors in poorly insulated homes and it is based on experience with radiant floors.
Both heating sytems provide radiant heat which is physically welcome when a person is cold and…"
"Don't forget that masonry stoves work best (just like radiant floors) in poorly insulated houses when you need a radiant surface to feel warm. If you've gotten your home up to a reasonably high insulation level, then it is hard…"
"How about this idea that I saw used on mid-floor balloon framed floors; in the basement ceiling, drill a 2-1/2 to 3" hole in each bay adjacent to the foundation, insert a poly bag into the hole leaving the open end of bag down…"
" To the technical question asked, the map does include wind speed, but stack effect--i.e. indoor-outdoor temperature differences--is the bigger driver. The zones follow a combinations of wind and temperature.
I am the father (or at least…"
"Jim, I'm chuckling as I remember reading an article years ago about the development of the LBL number. I have looked since and not been able to find that article so I cannot reference it. If anyone knows its whereabouts I would appreciate a…"
I am curious about the zone map developed by LBL that is used for calculating Building Tightness Limits (BTL) The map is ubiquitous, but pretty crude. It certainly doesn't correspond to avg wind speeds where I live. Are there any other factors incorporated in that map? Using the wrong zone can result in a 15-20% error in the BTLFor reference, I'm attaching some maps from MontanaThanks, JimSee More
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