Dennis Heidner
  • Kirkland, WA
  • United States
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Dennis Heidner's Page

Latest Activity

Dennis Heidner replied to Kyle Baker's discussion Solar ROI Calculator
"Are you sure it is a "25kW" system and not a "2.5kW" system.  25kW would be about 80 PV modules on the roof top (roughly),  and perhaps five or six Xantrex inverters (5kW each).  The majority of homes are 5kW or…"
Oct 14
Dennis Heidner replied to Ben Stallings's discussion radon mitigation with HRV?
"If the VOC and CO2 is coming from the basement floor drain... that's easy to test the hypothesis... move your Uhoo down next to the drain...because of the close proximity to the drain the gases would not have diffused as much and it should go…"
Oct 1
Dennis Heidner replied to Ben Stallings's discussion radon mitigation with HRV?
"There are a couple of important items in your post that started this thread.    First,  you believe you already have an indoor air quality problem (excluding the radon issues). Second, your wife is planning on having an art studio in…"
Sep 30
Dennis Heidner replied to Kyle Baker's discussion Solar ROI Calculator
"Or just use the PVWATTS calculator on the NREL website. https://pvwatts.nrel.gov/ It doesn't send information outside to third parties that might then send junk mail and call you at home."
Sep 28
Dennis Heidner replied to John Lile's discussion Air Sealing Manufactured Home
"Yup,  I'm not sure you want to even try tightening up a modular home built before 1975.  I think it's pretty risky.  These were not homes designed to last fifty+ years.  I've seen the fiberglass in those old walls…"
Sep 19
Dennis Heidner replied to John Lile's discussion Air Sealing Manufactured Home
"You made some very important observations. It's really important to think about how tight you air seal a modular home.  Replacement air for combustion devices such as stoves, furnaces and hot water heaters depend on those leaks. Tighten up…"
Sep 19
Dennis Heidner replied to John Lile's discussion Air Sealing Manufactured Home
"You didn't mention anything about the age of these homes.  Early mobile/modular homes (1960's) sometimes had walls that were made with 2" thick walls,  HVAC duct coupling between sides of a double wide - depended on the…"
Sep 19
Dennis Heidner replied to Ben Stallings's discussion high CO2 in a leaky house
"One  of the issues with the jump in readings - may also be related to the instrument design and its sensors.   If the CO2 reading is via an electrochemical sensor and not a nondispersive infrared sensor (NDIR), then its possible…"
Aug 30
Dennis Heidner replied to Ben Stallings's discussion high CO2 in a leaky house
"But he could use a Panasonic in the bedroom... Or the work area  that he sits in all day. Depending on the size of the house... the total continuous fresh air needs may only be 40cfm to 100cfm.   It doesn't sound like he's…"
Aug 30
Dennis Heidner replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"CO2 isn't the particular problem I was following up on.  It was the in ability of CO alarms to detect and report out low levells of CO until the appliances had gotten so bad that the CO was an immediate danger to life (short term…"
Aug 30
Dennis Heidner replied to Ben Stallings's discussion high CO2 in a leaky house
"I keep going back and pushing an ERV,  because they give you the ventilation, and you can have filtering on them to keep the pollen and dust outside... while also more or less maintaining the current RH balance.  If you tighten up the…"
Aug 30
Dennis Heidner replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"After we had discussions on this thread in this forum,  I started searching for and looking for CO detectors that would report the readings.  I'f figured that we'd see some movement and newer products. I did find some,  but…"
Aug 29
Dennis Heidner replied to Don Fugler's discussion Depressurization/make-up air issues in the group Kitchen Ventilation
"Have you done any more experiments to estimate combustion gas particulate while cooking? Presuming that the appliance isn't defective -- e.g. the flame is blue not yellow... If the carbon soot generally forms if the combustion process is too…"
Aug 29
Dennis Heidner replied to Ben Stallings's discussion high CO2 in a leaky house
"Look at one of the through the wall HRV/ERV's  Lumnos  about $1000  used in the bedroom and it still allows for the building envelop to be tightened.  It would also make a big difference on those numbers (if they are even…"
Aug 29
Dennis Heidner replied to Ben Stallings's discussion high CO2 in a leaky house
"What's breaking the bank?   If you want an accurate traceable instrument - expect to spend more than $500 and then spend about $200 for recalibrating the device periodically. Human bodies are pretty adaptable - if we are exposed to…"
Aug 28
Dennis Heidner replied to Ben Stallings's discussion high CO2 in a leaky house
"Don some of the newer CO2 sensors are pretty darn stable.  very stable,   much more predictable and easier to use.  The problem is there is no way of known what the maker of uHoo used.  A Non Dispersive IR sensor,  an…"
Aug 27

Profile Information

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

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