Graham Irwin
  • Fairfax, CA
  • United States
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  • Kaushal Bharath Raju
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Latest Activity

Graham Irwin replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
May 1
Graham Irwin replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"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…"
May 1
Graham Irwin replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"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…"
May 1
Graham Irwin replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"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…"
May 1
Graham Irwin replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"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…"
Apr 30
Graham Irwin replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"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…"
Apr 30
Graham Irwin replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"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…"
Apr 30
Graham Irwin replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"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…"
Apr 30
Graham Irwin replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"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…"
Apr 24
Graham Irwin commented on Chris Stratton's blog post We're Not Paying Enough Attention to Kitchen Ventilation
"Good idea to stop burning gas inside, induction cooktops eliminate combustion and deliver far more of the heat to the cookware, an additional benefit during cooling season."
Apr 3
Graham Irwin commented on Chie Kawahara's blog post Passive House Delivers 80% Energy Reduction in a 90-year-old House in Santa Cruz
"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…"
Mar 27
Graham Irwin commented on Chie Kawahara's blog post Passive House Delivers 80% Energy Reduction in a 90-year-old House in Santa Cruz
"David, 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…"
Mar 27
Graham Irwin replied to Luis Hernandez's discussion Calculating BTU lost per cfm leaks
"Remember to convert CFM (cubic feet per MINUTE) to cubic feet per HOUR (i.e. ft3/hr = CFM/60) if you want an answer in BTU/hr."
Jan 27
Graham Irwin replied to Luis Hernandez's discussion Calculating BTU lost per cfm leaks
"Bud, "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…"
Jan 27
Graham Irwin commented on Lenka Rihova's blog post PassivHaus – Is it the Future of Home Building?
"Tom, I would add that the DOE has integrated Passive House into their "Challenge Home" standard, which is the flagship program for Energy Star: http://apps1.eere.energy.gov/news/progress_alerts.cfm/pa_id=787 Personally, my intention…"
Feb 25, 2013
Graham Irwin commented on Lenka Rihova's blog post PassivHaus – Is it the Future of Home Building?
"Lenka, 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…"
Feb 25, 2013

Profile Information

Company
Essential Habitat
Professional Certification
Passive House Designer & Consultant
Website URL
http://www.essentialhabitat.com

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At 12:09pm on January 6, 2011, Diane Chojnowski said…

Hi Graham,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos andupcoming events. If you're blogging about home performance, this is the
place for you!

Don't forget to upload your profile photo. And,add your location on our Member Map!

Thanks!
Diane, HEP Moderator

 
 
 

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