George Kopf
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  • Berkeley, CA
  • United States
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3 PG&E Execs fired - 1 Chief of Staff at the CPUC Resigns

In case you missed…Continue

Tags: bruno, san, CPUC, PG&E

Started 1 hour ago

Real Estate Professionals need our support - but how?

I recently had the good luck to meet Craig Foley.  Craig is a Real Estate Professional and Building Performance advocate and he sent me this article he wrote:…Continue

Tags: realtors, agent, mls, appraisers, appraisal

Started 1 hour ago

Extremely long wait for hot water
3 Replies

Hello Home Energy Pros,I have a customer I am advising who complains of extremely long wait times for hot water.  He has a rather large house (4,000 + sq. ft.) and two tankless water heaters.  Can…Continue

Tags: heater, tankless, heating, water

Started this discussion. Last reply by Hal Skinner on Thursday.

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.

 

George Kopf's Page

Latest Activity

George Kopf posted discussions
1 hour ago
Hal Skinner replied to George Kopf's discussion Extremely long wait for hot water
"When it comes to remodeling, nobody knows nothin til ya open up the wall!  lol   :"" AW MAN!  Where the h--- is THAT pipe goin to???"  Yup been there done that. :)"
Thursday
George Kopf replied to George Kopf's discussion Extremely long wait for hot water
"Hal,  The answer to all of these great questions is:  don't know. But these are the exact questions the home owner I am helping needed to know to ask the plumbing contractor when they come out next week!  Thank you.  Very…"
Thursday
Hal Skinner replied to George Kopf's discussion Extremely long wait for hot water
"Hi George. Are we looking at 2 tankless wter heaters that are NOT located very near where the hot water faucets are, very near the kitchen, very near ther bathrooms?  Would relocating them closer to those areas be an option?  Sounds like…"
Thursday
George Kopf posted a discussion

Extremely long wait for hot water

Hello Home Energy Pros,I have a customer I am advising who complains of extremely long wait times for hot water.  He has a rather large house (4,000 + sq. ft.) and two tankless water heaters.  Can anyone recommend strategies (measures, behaviors, upgrades, etc.) that will let him get hot water quicker?  He is planning a whole house energy upgrade so there may be an opportunity for plumbing work.  Any input is welcome.Thanks in advance!George KopfSee More
Thursday
George Kopf replied to Benjamin Gromicko's discussion New Approach to Driving Demand for Energy Upgrades: Educating Real Estate Professionals
"Ben, I really appreciate the work you are doing.  Your video is spot on.  Kudos."
Sep 5
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

Profile Information

Company
CLEAResult
Professional Certification
BPI Building Analyst, Home Energy Pro Energy Auditor
Website URL
http://www.clearesult.com/

Comment Wall (2 comments)

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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

 
 
 

Home Energy Pros

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Latest Activity

George Kopf posted discussions
1 hour ago
Profile IconSharon Cannizzo, Katrina Ball, Mary Patterson and 1 more joined Home Energy Pros
3 hours ago
Craig Bird replied to Hal Skinner's discussion What this RCC will do on an exterior wall compared to standard paint. in the group The RCC Classroom (Radiant Control Coatings)
"I agree and studies done will agree with you in those cases too - it makes sense when there is…"
13 hours ago
Hal Skinner replied to Hal Skinner's discussion What this RCC will do on an exterior wall compared to standard paint. in the group The RCC Classroom (Radiant Control Coatings)
"You might want to check out this discussion in my…"
17 hours ago
Craig Bird replied to Hal Skinner's discussion What this RCC will do on an exterior wall compared to standard paint. in the group The RCC Classroom (Radiant Control Coatings)
"In this scenario the walls were made of R35 rigid foam. Even if ex-employee of big energy company…"
18 hours ago
Sean Lintow Sr replied to Kevin Jordan's discussion air infiltration total
"Sorry I don't have anything handy but pull a search for EqLA equivalent leakage…"
Sunday
Erik Henson commented on Andrew Navolio's blog post MEEA assists with Home Energy Certification programs
"It seems to me like we are trying to re-invent the wheel.  There are several available…"
Saturday
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Saturday

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