George Kopf
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  • Berkeley, CA
  • United States
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Time for a shift in thinking
6 Replies

Thank you to my friend Mina Agarabi for bringing this article to my attention:…Continue

Started this discussion. Last reply by George Kopf Nov 8, 2013.

What is wrong with the Residential Energy Efficiency industry (and how to fix it)

Howdy Home Energy Pros,Over the course of the last 5 years, I have seen a lot happen within the Residential Energy Efficiency industry.While I don't claim to know everything, I have some thoughts on…Continue

Started Sep 24, 2013

Misting Aeroseal in Pressurized Home = Amazing Air Sealing Innovation

As a training program manager for a non-profit, I am often too busy managing my program to catch all of the latest and coolest innovations in our field.  Therefore, I will apologize in advance if I…Continue

Tags: innovation, aeroseal, sealing, air

Started May 24, 2013

Ahhh...home inspection! The things we find!
1 Reply

A colleague sent this along and I thought I would share.  Buckle up, folks.  This is what we're up against!…Continue

Started this discussion. Last reply by David Meiland Feb 7, 2013.

 

George Kopf's Page

Latest Activity

Bob Blanchette replied to George Kopf's discussion Heat loss from ducts
"I read the PDF you linked to, 1 cycle per hour is highly unrealistic but illustrates a point. According to page 3 It takes 5 minutes before the coil gets cold enough to start accumulating condensate. Getting the coil cold BEFORE turning the blower…"
May 12
Bob Blanchette replied to George Kopf's discussion Heat loss from ducts
"The ON delay is important also. Allowing the coil to get below 50 degrees before turning on the blower allows the coil to start dehumidifying immediately instead of the typical 3 minute wait. Few PSC systems implement a blower on delay. Off delay…"
May 12
John Proctor replied to George Kopf's discussion Heat loss from ducts
"Bob Almost everywhere (except places like Riyadh) there are occasions of dry in wet climates as well as high humidity in dry climates. However predominantly in many parts of the US and elsewhere, the majority of the time when the air conditioner is…"
May 11
Bob Blanchette replied to George Kopf's discussion Heat loss from ducts
"Then there is Oklahoma where it's wet one week and dry the next. Last weekend humidity was in the teens, this week it's about 50%. I've seen it get into the 80%+ range after a good rain. Ideally a system should be able to see the…"
May 11
John Proctor replied to George Kopf's discussion Heat loss from ducts
"Bob You are hitting on a important point -- the length of the time delays are very important. The typical 90 second time delay on some ACs is set to take advantage of the mass of the evaporator coil and get a higher SEER rating. The applicable SEER…"
May 11
Ed Minch replied to George Kopf's discussion Heat loss from ducts
"Bob I ghink you are referring to two different issues.  One is the time per cycle to help keep efficiency high and that is what variable speed systems are all about  - keep the thing running so its efficiency stays near max. The…"
May 11
Bob Blanchette replied to George Kopf's discussion Heat loss from ducts
"There is always that hot/cold blast for a minute or so after the system starts. It takes awhile for the temp drop between the furnace/coil and register to stabilize. The less times it has to do that per hour the better. Fan off delays do help, but…"
May 11
John Proctor replied to George Kopf's discussion Heat loss from ducts
"Bob your point about surface area is right on. To elaborate, put in the smallest AC/furnace that will do the job, put the air handler in the center, run the ducts to high inside wall deliveries or center of ceiling, run the duct on the floor of the…"
May 11
Bob Blanchette replied to George Kopf's discussion Heat loss from ducts
"Lets not forget cycling losses. Equipment that cycles 2x per hour will have a lower heat loss through ducts than a system that cycles 4-6 times per hour. each time the system cycles the first 5-10 minutes are spent stabilizing the duct temperature.…"
May 11
John Proctor replied to George Kopf's discussion Heat loss from ducts
"George: As Iain noted the ASHRAE 152 calculation is pretty good and has stood the test of time. There have been field tests that showed how well it did against monitored data. (I can send you some) More recently we have found…"
Apr 14
Blake Shurtz replied to George Kopf's discussion Heat loss from ducts
"Hi Iain, I am very interested in finding a better way to calculate duct losses in gains in the field- could your spreadsheet help me? Thanks, Blake"
Apr 13
George Kopf replied to George Kopf's discussion Time for a shift in thinking
"Agreed.  All of this comes down to finding what motivates each client:  money, environment, health, reducing dependence on foreign energy sources, etc.  Some of the biggest energy wasters aren't motivated by money, some are.…"
Nov 8, 2013
Bob Blanchette replied to George Kopf's discussion Time for a shift in thinking
"Target customers with high utility bills. Sometimes big money wasters aren't that expensive to fix and will give a quick payback time. Trying to sell $5,000 worth of services to somebody with a $100/mo utility bill ain't gonna happen.…"
Nov 8, 2013
George Kopf replied to George Kopf's discussion Time for a shift in thinking
"Kent, I would like to thank you for sharing your observations.  I completely agree.  All of this means we are taking a less than optimal approach.  I will keep you abreast of future postings. If you are interested, I am in the process…"
Nov 5, 2013
Kent Mitchell replied to George Kopf's discussion Time for a shift in thinking
"Hey George!  Health, more money, better sex, legacy for kids and grandkids, self image.... That's the end results of what we are selling! You are right about selling the sizzle not the steak.  Most Building…"
Nov 1, 2013
George Kopf's discussion was featured

Time for a shift in thinking

Thank you to my friend Mina Agarabi for bringing this article to my attention:http://www.linkedin.com/today/post/article/20131010122659-17000124-how-to-fix-the-american-skills-gap?trk=tod-home-art-list-large_0Put short:  there's a skills gap in America.  Thanks to ARRA, though, the Building Performance industry knows how to prepare people for these…See More
Oct 31, 2013

Profile Information

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Rising Sun Energy Center
Professional Certification
BPI Building Analyst
Website URL
http://www.risingsunenergy.org

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At 12:18pm on June 7, 2011, Tom White said…

Welcome, George to Home Energy Pros.  I'm glad to see that it's useful for you and your crews!

 

 

Tom

At 2:58pm on May 27, 2011, Diane Chojnowski said…

Hi George,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming 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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Hal Skinner replied to Hal Skinner's discussion How much heat energy is lost through the floor of a house?
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Alliant Energy's PowerHouse TV: Sealing Leaky Ductwork

"Very educational. thanks for sharing Tom."
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How much heat energy is lost through the floor of a house?

I am asking this as I do not recall anyone speaking of any study to this end.  Many comments about…See More
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