Dennis Heidner
  • Kirkland, WA
  • United States
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Dennis Heidner replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"Dan, Solar PV and solar H2O work in northern climates...They can still provide the desired goal in cool areas.  But the Heat Pump Hot Water Heater option may be a problem if you are trying to use one in a climate zone 5 or above.  It may…"
Apr 28
Dennis Heidner replied to Dan Antonioli's discussion Net Zero Energy Hot Water
"What climate zone are you in?  Where would the hot water heater be set?  Northern climates with a heat pump in a cool/cold room can be counter productive.   Place the same HPHW inside a house in a hot humid climate and you may see…"
Apr 28
Dennis Heidner replied to Dave Hahn's discussion Airflow "through" a building or "beneath" the exterior cladding
"The last picture with fiber cement - looks like the pattern you might see from water. Is the fiber cement board on firring?  Blind nailing?  Did they paint the fiber board after installation and seal up the overlapping --- leaving only the…"
Apr 7
Dennis Heidner replied to Tim Kendzia's discussion Cooling effect from solar panels
"We have PV panels on our roof,  we tracked the panel temps, microinverter temps,  and attic temps for a couple of years.  We did see a definite reduction in attic temps under the panels.  Five degrees F is reasonable.  But…"
Apr 7
Dennis Heidner replied to Bruce Navin's discussion LED's interfering with Garage Door Openers
"So this is an old post... with some new comments on it.   The problem is not likely coming from the LED bulbs - alone.  It probably is a combination of old analog garage door openers and general RF noise in the neighborhood... with the…"
Dec 3, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"For Rod, second part... When I see really large electric services... my first reaction my be "what a waste",  but when I stop and catch my breath and take the time to ask why... something more useful is generally discovered.   My…"
Nov 29, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"Rod,  I did see earlier that you had calculated the loads.  The key is even though a consumer device may not have the accuracy... you can still use it to find the "phantom loads".   You need to use that spread sheet of…"
Nov 29, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"Note to readers 0.5A instead of 5A for reading with A/D.... the edit to correct that didn't apparently take because of timeouts... likewise  0.1A instead of 1Amp.. "
Nov 28, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"Rod, I have some of the CT's that you referenced in the openenergymonitor system.  They are at "best" 3% devices...  the openenergysystem is likely to have system error/uncertainty in/around 10%.   The utility meters…"
Nov 28, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"1200A service... really?  or did you mean 200A.  That size service would likely result in its own large transformer (probably ground mounted)... and likely three phase to home. The electrician likely did the audio/video system as well as a…"
Nov 28, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"yes,  I'd think even for a very large house / residence that you'd want to look carefully at the loads and decide which of the motors you want to put on timers and upgrade to more efficient motors ASAP. Besides well pump, if the…"
Nov 28, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"Yup,  but it also looks like for the tariffs above residential services that they include riders for KVA... if the right conditions are…"
Nov 27, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"It's not just the CT's that you need to worry about.   The CT will pick up the current and provide a voltage across a "load" resistor that can be measured.   The system accuracy of the external measurement is dependent…"
Nov 27, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"I think you met the reply for Rod Frost."
Nov 27, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"I have TEDS,  they ARE NOT REVENUE grade.  The 1000's and 5000's have serious problems in which they can under report or over report (randomly)... they are really only useful for getting a rough feel.  And I've been…"
Nov 23, 2015
Dennis Heidner replied to Rodney Fox's discussion Utility Meter Accuracy
"In the case of the threads original author... that would mean that the readings the utility would be taking and basing their monthly charges would be LOWER not higher than the authors digital data logger.  E.g. the worst case if the meter was…"
Nov 20, 2015

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Company
Rextorgroup
Professional Interests
Energy efficiency, building envelop, renewables, building modeling

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At 12:25pm on March 21, 2013, Diane Chojnowski said…

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