Dennis Heidner
  • Kirkland, WA
  • United States
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Dennis Heidner replied to Jim Tenhundfeld's discussion LED's and motion sensors
"Yes,  and the reason why it is occurring is that the motion detector is powered only through the light bulb.  There are several ways to solve the problem. 1) feed back to the daylight photo sensor (easy to test... cover it with tape)...…"
Feb 2
Dennis Heidner replied to John Proctor's discussion Unvented Gas Space Heaters – Continued Delays
"John,  of the byproducts listed,  the CO, NOx and H2O I suspect are the most important to consider.   For the unvented heaters used in a cold dry climate during the winter time -- probably adds just a portion of the H2O that would be…"
Feb 2
Dennis Heidner replied to Mary Sinkler's discussion Lighting replacement - 300 watt LED flood light
"Have you looked how much light you need in the backyard and where you need the light?  Often a one for one replacement is a gross overkill.  You may be able to significantly reduce the size (lumen equivalent) of the light.  Also are…"
Jan 16
Dennis Heidner replied to Sean Lintow Sr's discussion Water Saver or Gimmick? in the group Best Practices (Residential)
"Grey water can really be a problem if it sits too long in the pipes or the back of a toilet.  That soap or extra stuff that makes it grey water really needs to be filtered out and processed before re-use.  Bacteria such as legionella is…"
Oct 13, 2016
Dennis Heidner commented on Home Energy Magazine's blog post My Apartment in Tokyo
"Alan,   Were you able to make observations about number of lightbulbs, sizes and types?   Are they moving away from incandescent,  halogens and CFL's to LEDs? Window coatings/treatments?  Single pane, double pane?…"
Jun 6, 2016
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, 2016
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, 2016
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, 2016
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, 2016
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

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Energy efficiency, building envelop, renewables, building modeling

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