"Good point, but the Passive House system is also running continuously, which would tend toward higher capture efficiency as contrasted to a situation with low vented range hood usage. While the intermittent rate may be higher, its duty cycle may be…"
"If you applied 100 CFM to the kitchen on demand, it would meet the 62.2 requirement, but you would be over-ventilating, since there is a continuous exhaust function occurring 24/7 in addition. Passive House aims for ~0.3 ACH continuous ventilation…"
"This is pretty unsettling! To clarify, the presence of a recirculating hood is not a code violation, the absence of an exhausting hood is the code violation, in residential buildings with three or fewer stories. In Passive House, both a…"
"0.006 ACH50 would be better, but not feasibly attainable. 1.5 vs 0.6 ACH50 makes a big difference when you're aiming for Passive House levels of performance. I am not experienced enough to expound on the cost curve of air tightness, but I know…"
"True, a vessel leaking water at the same rate would lose more energy, but since the "vessel" in question is a building, it is filled with conditioned air, not water, and leaks are insidious.
Solar gains help to a point, but tend to be…"
"I take issue with your reasoning. Since Passive House is a performance metric, the climate is irrelevant in terms of marginal return analysis. Except for the air tightness, which is set at the same level in all climates, everything else is climate…"
"It's interesting to me that ASHRAE 62.2 requires a kitchen exhaust vented directly to the interior at either 100 CFM intermittent or 5 ACH continuous, both of which are higher than the typical "hybrid" Passive House approach where a…"
"I've been involved with a number of Passive House retrofits in California, including the first one in the state (the O'Neill residence in Sonoma) and Kurt & Chie's home in Santa Cruz, and I would say, #1, "Don't fix what…"
"There was confusion about the insulation levels in the attic when it was installed, discovered during the certification process. Fortunately, it was blown-in cellulose, so it was a minor issue to correct.
There are many flat lots with existing…"
This was a trailblazing project in many ways, and will be much easier to replicate than devise. Beyond that, the cost of new construction would have been higher and and the process harder due to newer, more stringent building code…"
"In an article from one of the developers of the "n" number he stated the resulting estimate could be off by minus 50% to plus 100% so calling it a ball park estimate may be generous."
Do you recall the article…"
I was confused by a number of assertions in your article:
1) You state that PassivHaus (Passive House) does not focus on CO2 emissions. In actuality, the standard sets a limit on primary energy, which is directly correlated with CO2…"
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