Episode 660: Andrew K. Persily, PhD - Understanding Indoor CO2, Building Ventilation and Their Affects on IEQ
Posted: Fri Apr 08, 2022 6:48 pm
Show Resources:
Show Discussion:
12:03:55 From LaNguye : IAQ Radio is financing Don's lifestyle with his correct answers to trivia!
12:04:14 From cliff zlotnik : TRivia: At what time does counting solar mean time begin?
12:05:45 From Donald Weekes : Midnight at Greenwich, UK
12:06:17 From cliff zlotnik : correct Don, send your address
12:07:17 From LaNguye : Congratulations Andy for your fellowship.
12:08:12 From Donald Weekes : Cliff: That was one I knew w/o looking it up.
12:08:35 From cliff zlotnik : WOW!!!!
12:08:45 From Donald Weekes : Congrats, Andy on the NIST Fellowship!
12:12:20 From AAH : 1994 - Womble, Develop Baseline Info on Bldg and IAQ BASE'94, Part I-Study Design, Bldg Selection, and Bldg Descriptions, Healthy Buildings, 95, 1305-1310, 1995.
12:16:42 From Kishor Khankari : What it would take those in the building design and operation to realize that "Buildings are for People" so that our buildings human-centric?
12:19:44 From LaNguye : Andy did a fabulous job as Chair.
12:24:23 From Kishor Khankari : Breathing zone of occupants is the most critical zone in occupied space. Don't you think current building design guidelines are "beating around the bush".
12:25:25 From AAH : Question: Andy - does your dissatisfaction curve vs CO2 still stand? [Persily, The Relationship Between Indoor Air Quality and CO2, Proc 7th Int. Conf IAQ Climate, 2, 1996]
12:33:11 From Donald Weekes : Andy: What are your thoughts about the CO2 measurements in schools and used for determining that the IAQ in the school is 'acceptable', or 'not acceptable.\
12:34:24 From Kishor Khankari : Traditionally emphasize is placed on quantity of air rather than how well the air distributed to breathing zone. How can we change this thinking?
12:36:11 From Lukas Jenkins (Edifice Rx) : For smaller buildings without ducted OA, due to operable windows and code allowing this, how about CO2 demand control to circulate air throughout the occupied space for local CO2 dilution. Say one room has higher CO2 due to occupancy but other rooms in the building have low CO2. Thoughts?
12:36:32 From Lukas Jenkins (Edifice Rx) : Room by room CO2 sensors, 1 AHU.
12:38:44 From AAH : Question: Andy - over the years I have found both the outdoor air and indoor air to be normally distributed (including longitudinally). Have you also seen this?
12:44:56 From David Miller : https://nap.nationalacademies.org/read/11170/chapter/5
12:53:18 From Kishor Khankari : Please share the link for this tool
12:53:36 From Ya Gotta Have Faith : https://pages.nist.gov/CONTAM-apps/webapps/CO2Tool/#/
12:59:21 From AAH : Persily, Analysis of ventilation data from the US Environmental Protection Agency building assessment survey and evaluation (BASE) study, NISTIR 7145, 2004
13:00:08 From LaNguye : when is this coming out Andy ?
13:00:59 From Lukas Jenkins (Edifice Rx) : Follow up question for Andy in the after thoughts based on Cliff’s paraphrasing of my question and Andy’s response. So in a 1 AHU scenario if one were to monitor CO2 in every office would fan recirculation be a plausible “demand control strategy” to keep spaces close to the bldg. average vs. CO2 building up in one space but then low in common area. CO2 demand recirculation I’ll call it as we are under the premise the codes don’t have OA ducted into the building and windows would be the “ventilation” but we still want to keep CO2 low or balanced space by space rather than building up.
13:01:06 From Lukas Jenkins (Edifice Rx) : Thanks Andy!
13:02:02 From Andrew Persily : https://link.springer.com/referencework ... -10-5155-5
13:10:35 From Victor Cafaro : Great show
13:11:14 From Lukas Jenkins (Edifice Rx) : Great show! A lot of food for thought as we reinvent IAQ HVAC and infection control with energy consumption in mind and sensors for demand control ventilation!
12:03:55 From LaNguye : IAQ Radio is financing Don's lifestyle with his correct answers to trivia!
12:04:14 From cliff zlotnik : TRivia: At what time does counting solar mean time begin?
12:05:45 From Donald Weekes : Midnight at Greenwich, UK
12:06:17 From cliff zlotnik : correct Don, send your address
12:07:17 From LaNguye : Congratulations Andy for your fellowship.
12:08:12 From Donald Weekes : Cliff: That was one I knew w/o looking it up.
12:08:35 From cliff zlotnik : WOW!!!!
12:08:45 From Donald Weekes : Congrats, Andy on the NIST Fellowship!
12:12:20 From AAH : 1994 - Womble, Develop Baseline Info on Bldg and IAQ BASE'94, Part I-Study Design, Bldg Selection, and Bldg Descriptions, Healthy Buildings, 95, 1305-1310, 1995.
12:16:42 From Kishor Khankari : What it would take those in the building design and operation to realize that "Buildings are for People" so that our buildings human-centric?
12:19:44 From LaNguye : Andy did a fabulous job as Chair.
12:24:23 From Kishor Khankari : Breathing zone of occupants is the most critical zone in occupied space. Don't you think current building design guidelines are "beating around the bush".
12:25:25 From AAH : Question: Andy - does your dissatisfaction curve vs CO2 still stand? [Persily, The Relationship Between Indoor Air Quality and CO2, Proc 7th Int. Conf IAQ Climate, 2, 1996]
12:33:11 From Donald Weekes : Andy: What are your thoughts about the CO2 measurements in schools and used for determining that the IAQ in the school is 'acceptable', or 'not acceptable.\
12:34:24 From Kishor Khankari : Traditionally emphasize is placed on quantity of air rather than how well the air distributed to breathing zone. How can we change this thinking?
12:36:11 From Lukas Jenkins (Edifice Rx) : For smaller buildings without ducted OA, due to operable windows and code allowing this, how about CO2 demand control to circulate air throughout the occupied space for local CO2 dilution. Say one room has higher CO2 due to occupancy but other rooms in the building have low CO2. Thoughts?
12:36:32 From Lukas Jenkins (Edifice Rx) : Room by room CO2 sensors, 1 AHU.
12:38:44 From AAH : Question: Andy - over the years I have found both the outdoor air and indoor air to be normally distributed (including longitudinally). Have you also seen this?
12:44:56 From David Miller : https://nap.nationalacademies.org/read/11170/chapter/5
12:53:18 From Kishor Khankari : Please share the link for this tool
12:53:36 From Ya Gotta Have Faith : https://pages.nist.gov/CONTAM-apps/webapps/CO2Tool/#/
12:59:21 From AAH : Persily, Analysis of ventilation data from the US Environmental Protection Agency building assessment survey and evaluation (BASE) study, NISTIR 7145, 2004
13:00:08 From LaNguye : when is this coming out Andy ?
13:00:59 From Lukas Jenkins (Edifice Rx) : Follow up question for Andy in the after thoughts based on Cliff’s paraphrasing of my question and Andy’s response. So in a 1 AHU scenario if one were to monitor CO2 in every office would fan recirculation be a plausible “demand control strategy” to keep spaces close to the bldg. average vs. CO2 building up in one space but then low in common area. CO2 demand recirculation I’ll call it as we are under the premise the codes don’t have OA ducted into the building and windows would be the “ventilation” but we still want to keep CO2 low or balanced space by space rather than building up.
13:01:06 From Lukas Jenkins (Edifice Rx) : Thanks Andy!
13:02:02 From Andrew Persily : https://link.springer.com/referencework ... -10-5155-5
13:10:35 From Victor Cafaro : Great show
13:11:14 From Lukas Jenkins (Edifice Rx) : Great show! A lot of food for thought as we reinvent IAQ HVAC and infection control with energy consumption in mind and sensors for demand control ventilation!