Paul W. Francisco University of Illinois at Urbana Champaign

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Kristopher McKinney
6 years ago
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1 Paul W. Francisco University of Illinois at Urbana Champaign 1

2 (it s not really that scary) 2

3 15 cfm/person originated from smell tests in the 1930s (Yaglou et al. 1936) and more or less again in 1983 (Cain et al.; Fanger et al.) How much air did we need to not be offended by each other s body odor? Used bioeffluents (and 1930s hygiene) as a surrogate for IAQ Suggested might actually want 20 cfm/person Or 25 cfm for schools Or even 50% more for schools if the children hadn t bathed or changed their underwear in a week 3

4 4

5 TVOC TVOC Number (n) Mean (ppb) Geo-mean (ppb) Pre-Wx all Post-Wx all Pre-Wx Post-Wx Pre-Wx Post-Wx T-test p-value Yellow indicates statistical significance 5

6 Carbon dioxide (CO 2 ) TVOC Number (n) Mean (ppm) Geo-mean (ppm) Pre-Wx all Post-Wx all Pre-Wx Post-Wx Pre-Wx Post-Wx T-test p-value Yellow indicates statistical significance 6

7 Radon, 1 st floor Radon Number (n) Mean (pci/l) Geo-mean (pci/l) Pre-Wx all Post-Wx all Pre-Wx Post-Wx Pre-Wx Post-Wx T-test p-value Green indicates statistical significance at p <

8 Radon, basement TVOC Number (n) Mean (pci/l) Geo-mean (pci/l) Pre-Wx all Post-Wx all Pre-Wx Post-Wx Pre-Wx Post-Wx T-test p-value Green indicates statistical significance at p <

9 Children experienced fewer headaches Statistically significantly fewer in homes Fewer respiratory ailments in children, not statistically significant Reductions in eczema and skin allergies in children in both groups, difference between groups not statistically significant 9

10 Adults had less psychological distress Difference between groups not statistically significant Statistically significant improvement in reported overweight adults in homes relative to homes 10

11 12 Radon level (pci/l) Dec Jan Feb Mar Apr May Jun Fan on Individual 8-hour radon reading Period average 11

12 40 % change in radon associated with ventilation operation Unadjusted difference in means Regression estimate 95% confidence interval for regression estimate (Site number) By site, from lowest to highest regression estimate Results expressed as a percent of average fan-off radon level over the monitoring period. 12

13 Standard 62.2 is under continuous maintenance Committee meets twice a year Changes can be proposed from within or from outside To be approved changes must get supermajority in committee successfully pass through public review Full new edition incorporating all approved changes released every 3 years 2016 edition should be out in the spring 13

14 17 (!) new changes got approved for publication in the 2016 edition The good news most do not have MAJOR impacts on many homes in weatherization The bad news some proposals that would have made things easier did not complete the process 14

15 Technical Multifamily Minimum airflow requirement for installation Local exhaust Controls Variable ventilation strategies Unvented space heaters 15

16 Non technical Multifamily Clarification of requirements Sound Measurement Makeup air Combined exhaust/intake Terminology Definitions References 16

17 Multifamily used to be split between 62.1 (4+ stories) and 62.2 (1 3 stories). Addendum g brought all multifamily dwelling units into 62.2 corridors, common spaces, mechanical rooms, etc. still

18 Requirements integrated into the rest of the standard (addendum m) Had been in its own special section (Section 8) Makes importance placed on multifamily appear greater To accommodate, term house or building replaced with dwelling unit, e.g. whole dwelling unit ventilation 18

19 No multifamily building was ever allowed to get an infiltration credit Addendum j allows infiltration credit for horizontallyattached Duplexes Triplexes Row houses Etc. Reduce credit based on common wall area 19

20 Consider a triplex, each unit is 40 x 25 with 8 ceilings Total surface area per unit is 1000x x x2 = 3040 sq. ft. Infiltration credit (as a percentage of single family calculation): End units get ( )/3040 = 2840/3040 = 93.4% Middle unit gets ( )/3040 = 2640/3040 = 86.8% 20

21 Compartmentalization Standard 62.2 had said that one way to demonstrate compartmentalization was to measure airtightness of 0.2 CFM50 per square foot of envelope area Changed to 0.3 Note: this is NOT a mandatory threshold 21

22 Addendum b For existing buildings, if the final ventilation requirement (considering deficits and infiltration) is less than or equal to 15 cfm then installation of a fan is NOT required Already commonly used in WAP 22

Significant changes for kitchens (addendum c) Defines enclosed kitchen openings to other spaces don t exceed 60 square feet Continuous kitchen exhaust not permitted for non

23 Significant changes for kitchens (addendum c) Defines enclosed kitchen openings to other spaces don t exceed 60 square feet Continuous kitchen exhaust not permitted for non enclosed kitchens For on demand kitchen exhaust 100 cfm if the fan is a range hood 300 cfm otherwise For existing buildings, still use 100 cfm as the baseline for the deficit calculation 23

24 Long standing confusion over what counts Addendum a refers to ANSI Standard Z765 Based on finished area Unfinished basement does not count 24

25 Standard 62.2 has long said there needs to be readilyaccessible override Addendum n lists two options, not intended to be exclusive: Fan switch Dedicated circuit breaker Controls must be labeled with text or icon In multifamily the control does not have to be readily accessible to the occupants 25

26 Language could be interpreted to overly limit kitchen fans Addendum p clarifies that if there is any kitchen fan speed that is at least 100 cfm and no more than 3 sones it is acceptable as demand controlled local exhaust 26

27 Addendum d clarifies that makeup air dampers can t be barometric or gravity in non powered makeup air systems In other words, you can t have everything be passive something has to be active 27

28 Some people were saying that measurement of exhaust flow at fan was not allowable Addendum r clarified that this is allowable, along with measurement anywhere along the system 28

29 Addendum h Minimum separation not required as long as manufacturer specs state that there is no more than 10% cross contamination Mainly for HRVs Cannot be used for kitchens 29

30 Addendum v provides structure for wide range of noncontinuous options Short term intermittent (same schedule, at least once every three hours) stays the same e.g. having a 60 cfm fan run for 20 minutes every hour counts the same as having a 20 cfm fan running continuously 30

31 New structure provides a method to determine equivalency of more advanced schedules, e.g. Temperature based Occupancy based Humidity based Etc. Requires that short term exposures do not exceed 5x annual average, provides calculation method 31

32 Addendum t removed the section that stated that unvented space heaters were out of scope Allows specifications to be placed regarding unvented space heaters 32

33 Update references (2 addenda) Make dwelling unit term consistent throughout Appendix A (existing buildings alternative compliance path) 33

34 but was being worked on (Possible 2019 preview) 34

35 Infiltration in vertically attached units Prospects: uncertain Improved compartmentalization specifications Prospects: uncertain Possible restrictions on ventilation type Prospects: likely Plan to have working group focused on these issues 35

36 Currently, standard has limits to net exhaust (prescriptive) Attempted to get reference to BPI 1200 method (performance) Commenters want other documents also referenced, e.g. NFPA 54 Prospects: High 36

37 Standard has complex equations Common in SWS/WAP to use simplified equation: Qinf = * CFM50 * wsf * S Public review comment objected to different path Some concerned that this equation assumes a specific ceiling height Prospects: High (in some form) 37

38 Now in scope, couldn t agree on requirements Broad range of views on the committee, from saying nothing to banning them Some consensus around prohibiting space heaters built to pre 2005 standards Prospects: High (for something, TBD) 38

39 Would allow reduced flow rate with improved filtration Not likely to impact weatherization Prospects: High 39

40 Would allow reduced flow rate if ventilation system provided intentional distribution Prospects: uncertain 40

41 Would reduce floor area portion of base ventilation rate from core equation by about 25% Prospects: uncertain 41

42 Well understood that interaction between infiltration and ventilation is different depending on whether ventilation is balanced or unbalanced Proposal would account for that difference Prospects: High 42

43 Decent existing fans can be used Need to use proper controls Existing fans can be replaced Make use of existing penetrations and wiring Exhaust is NOT required Use alternate option when conditions warrant Placing fans in kitchens or bathrooms can reduce required rates Intent of override cleaning, blower door testing, avoiding bringing in bad outdoor air when highly polluted (e.g. wildfires) 43

ASHRAE 62.2: What s New in 2016

ASHRAE 62.2: What s New in 2016 Rick Karg 2016 Residential Energy Dynamics, LLC What We Will Talk About Overview of mechanics of 62.2-2016. Logic behind the Standard. Sizing local ventilation (exhaust-only).