Location
Davis, CA
"Don: thx for the excellent questions, as usual ! (hope this is not redundant; it is my second try in commenting on this)
re: combustion safety, I would stress source control as the first and most reliable measure (remove or minimize the indoor &…"
re: combustion safety, I would stress source control as the first and most reliable measure (remove or minimize the indoor &…"
"Selected updates with new Info:
COOKING EMISSIONS & VENTILATION
-- UK study of PM emission rates for 4 full meals. "Using a cooker hood (apparent capture efficiency > 90%) and frying in non-stick pans were found to significantly reduce emissions.…"
COOKING EMISSIONS & VENTILATION
-- UK study of PM emission rates for 4 full meals. "Using a cooker hood (apparent capture efficiency > 90%) and frying in non-stick pans were found to significantly reduce emissions.…"
"Brennan:
re: CMHC reports: if you don't have any luck, I can track down the big pile of hard copies I collected at CARB (may be in the Cal EPA library, or in my home file storage)."
re: CMHC reports: if you don't have any luck, I can track down the big pile of hard copies I collected at CARB (may be in the Cal EPA library, or in my home file storage)."
"Hi Dara:
thx for the update. Sounds like you made some progress.
CA still has a lot of natural draft and some (illegal) unvented gas log sets, but we are now pushing to decarbonize not only the grid but also (finally) buildings. So there may need…"
thx for the update. Sounds like you made some progress.
CA still has a lot of natural draft and some (illegal) unvented gas log sets, but we are now pushing to decarbonize not only the grid but also (finally) buildings. So there may need…"
"Dara:
thx for the reminder.
As I recall, CMHC funded some studies on this, which you probably did and know well, as would Don Fugler.
Also, Dave Grimrsud et al at U. Minn and Niren Nagda observed and recorded this problem in at least one home. …"
thx for the reminder.
As I recall, CMHC funded some studies on this, which you probably did and know well, as would Don Fugler.
Also, Dave Grimrsud et al at U. Minn and Niren Nagda observed and recorded this problem in at least one home. …"
"Hi Don: good questions, as usual.
Would be great to routinely get depressurization data -- not hard to do.
See my NAPHN 2019 slides near the end for example of P measurements for installed MA system, at ROCIS Range Hood page).
re: consequence #4:…"
Would be great to routinely get depressurization data -- not hard to do.
See my NAPHN 2019 slides near the end for example of P measurements for installed MA system, at ROCIS Range Hood page).
re: consequence #4:…"
"Just curious: Has the air district (or local AQ researchers) seen such anomalies before?"
"Luke:
re: hood flow rate and make up air recommendations, see my slides from NAPHN 2018 (p. 34 +) and the Tools section (aww Broan's online tool for MA system design), at http://rocis.org/range-hood-tools-and-presentations.
150 CFM might work in a…"
re: hood flow rate and make up air recommendations, see my slides from NAPHN 2018 (p. 34 +) and the Tools section (aww Broan's online tool for MA system design), at http://rocis.org/range-hood-tools-and-presentations.
150 CFM might work in a…"
"Interesting! Were similar changes seen in the regulatory AQ monitoring sites?
if not, can you rule out artifacts in your PM sensors re: changes in temperature, humidity, pressure etc.?"
if not, can you rule out artifacts in your PM sensors re: changes in temperature, humidity, pressure etc.?"
"HI Dennis;
good point re: PV benefit of load shifting re: waste heat.
I was referring to the whole cooling system, which is removing heat from a building. If the building shell and cooling system are not very efficient, then PV systems are still…"
good point re: PV benefit of load shifting re: waste heat.
I was referring to the whole cooling system, which is removing heat from a building. If the building shell and cooling system are not very efficient, then PV systems are still…"
"re: hard data, I recall seeing at least one study that showed some cooling from PV shade on roof. Suggest you contact David Sailor's groups at AZ State U. re: their project:
Impacts of Photovoltaic panels on urban climates and building energy use.…"
Impacts of Photovoltaic panels on urban climates and building energy use.…"
"Certainly did, using my eye & nose sensors.
1) smoke & lingering odors from frying bacon. Visiting family were doing that cooking (we rarely cook bacon).
Good news: the next time I cooked bacon, I put a lid over the pan, left it slighlty open on…"
1) smoke & lingering odors from frying bacon. Visiting family were doing that cooking (we rarely cook bacon).
Good news: the next time I cooked bacon, I put a lid over the pan, left it slighlty open on…"
"Hope they also measure indoor heat exposure (T, RH or Twet, radiant T) and compare to modeled estimates and overheating guidelines such as CIBSE TM 59 and Passive House."
"See list of Easy Ways to Reduce Exposure (and in some cases, toxicity) in the ROCIS Range Hood best practices guide and the NAPHN 18 slide show.
Cooking outside also helps keep the house cooler in the summer, but can add to outdoor air pollution and…"
Cooking outside also helps keep the house cooler in the summer, but can add to outdoor air pollution and…"
"I suspect your variable results are due to
1) mainly variation in type of candle, wick, and burn condition. There are lots of studies on this, and some on the toxicity of candle and incense emissions (the latter are really nasty).
2) particle sizes…"
1) mainly variation in type of candle, wick, and burn condition. There are lots of studies on this, and some on the toxicity of candle and incense emissions (the latter are really nasty).
2) particle sizes…"
"thx, Don.
See slides 16-17
BTW, it is a modeling study , based lab data and assumed outdoor PM2.5 levels and infiltration rates, and an electric stove.
"your exposure results may vary", e.g., if you have higher outdoor PM levels, higher emissions…"
See slides 16-17
BTW, it is a modeling study , based lab data and assumed outdoor PM2.5 levels and infiltration rates, and an electric stove.
"your exposure results may vary", e.g., if you have higher outdoor PM levels, higher emissions…"
Comments
Tom -
Would like you to be a member of the Low-cost monitoring group - to do so you need to be Don's or my friend so we can invite you. Easy to reset your password if that is a barrier.
Linda
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