Graham Irwin
  • Fairfax, CA
  • United States
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Latest Activity

Graham Irwin commented on Home Energy Magazine's blog post Revisiting Electrification
"As we move toward more and more renewable energy in the grid, storage will be a key issue. The biggest challenge is providing renewable energy in winter, when solar energy is lowest. Not coincidentally, that's also when heating demand is…"
May 7
Graham Irwin posted an event

Passive House: Building A “Renewable Ready” California at Online

May 12, 2015 from 1pm to 2pm
In this webinar we will discuss cost­‐optimized, high­‐performance homes that meet the “Passive House standard” and how this can be achieved throughout California with minimal additional effort and cost. Attention will be paid to the economies of scale and construction cost reductions available in multi-family Passive House buildings.See More
Apr 30
Graham Irwin replied to George Kopf's discussion How does efficiency factor into a grid parity world?
"John, Interesting though, if you read this NREL article (https://financere.nrel.gov/finance/content/germany-solar-feed-in-ta...), it would suggest that we are spending as much as Germany per installed kW if federal tax credits and accelerated…"
Oct 23, 2014
Graham Irwin replied to George Kopf's discussion How does efficiency factor into a grid parity world?
"George, You raise a good question. The concept of "free and unlimited" energy is not new, in fact it is arguable that this idea is what got us into the trouble we're in to begin with (http://en.wikipedia.org/wiki/Too_cheap_to_meter).…"
Oct 23, 2014
Graham Irwin replied to Christopher Talarico's discussion Heating with Tankless Water Heater & Hydronic Air Handler vs. Gas Furnace
Sep 4, 2014
Graham Irwin replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Great information, thank you!"
Aug 5, 2014
Graham Irwin replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Useful information is the Coefficient of Performance (COP) of the whole house fan vs. alternatives. The true answer is more complicated than that, since all equipment has a COP "curve" that flattens out as the delta-T between inside and…"
Aug 5, 2014
Graham Irwin replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Thanks for the input. The next question to ask is "how much cooling power is delivered in each case?" Whole house fans work best when the house is hot and the air is cold. Either of those things change and they work less well. I am not…"
Aug 1, 2014
Graham Irwin replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Kurt, The "large fan" is a whole house fan moving anything from 1000-4000 CFM. By comparison, the ventilation system for the T24 prototype home we modeled was 67 CFM. As you might imagine, a fan that moves 1000-4000 CFM could use a lot of…"
Aug 1, 2014
Graham Irwin replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"I think it is important to check the energy consumption of such a large fan, even assuming it can be properly air-sealed and insulated. We are finishing up a study on 2013 Code vs. Passive House in each of California's climate zones and, while…"
Jul 31, 2014
Graham Irwin replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
May 1, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014

Profile Information

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

Comment Wall (1 comment)

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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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Passive House Testing Webinar with Kevin Brennan of the Passive House Academy at Online

September 29, 2015 from 1pm to 2pm
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