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ASHRAE Std 62 update An Outline

ASHRAE Std 62.1-2007 Ventilation for Acceptable Indoor Air Quality ASHRAE 62.1 update: Overview - Where are we now?. ASHRAE Std 62 update An Outline. General comments General requirements Ventilation requirements Construction and O/M requirements Questions.

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ASHRAE Std 62 update An Outline

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  1. ASHRAE Std 62.1-2007 Ventilation for Acceptable Indoor Air QualityASHRAE 62.1 update:Overview - Where are we now?

  2. ASHRAE Std 62 updateAn Outline • General comments • General requirements • Ventilation requirements • Construction and O/M requirements • Questions

  3. ASHRAE Standard 62What’s Its History? • 62-2001 • Prescriptive • Commissioning • O&M • Combustion air • Filtration • 62-1999 • IAQ-Health disclaimers • Smoking disclaimers • Clarified CO2as ventilation metric 62-1981Alternative Air Quality Proc. 62.1-2007Updated 1970 1980 1990 2000 2010 • 62-1989 • Removed Thermal Comfort • Ventilation Rate Proc. • IAQ Proc. • 62.1-2004 • Commercial and High Rise Res. • Enforceable code language • ETS vent. rates not covered • Vent. Rate. Proc. Modified • Occupant and area vent. rates 62-1973first issued

  4. ASHRAE Standard 62.1-2007 & Related Activities… • Std 62.1-2007 is the most current version • IMC adopted methodology and rates in 2007 Supplement • Several educational courses are available from ASHRAE

  5. 62.1-2007 Purpose • 1.1 Specify minimum ventilation rates and other measures intended to provide IAQ that is acceptable to human occupants and that minimizes adverse health effects. • 1.2 Intended for regulatory application to new buildings, and additions • 1.3 Guide the improvement of IAQ in existing buildings.

  6. 62.1-2007 Scope • 2.1 All spaces intended for human occupancy. • 2.2 Defines requirements for ventilation, air-cleaning design, commissioning, installation and O&M • 2.3 Additional requirements and other standards may apply (labs, healthcare, industrial, etc.) • 2.4 May be applied to both new and existing buildings, not intended to be used retroactively • 2.5 Does not prescribe specific ventilation rates for smoking spaces

  7. 62.1-2007 Scope Con’t • 2.6 Ventilation requirements based on chemical, physical, & biological contaminants • 2.7 Consideration or control of thermal comfort is not included • 2.8 Contains requirements, in addition to ventilation related to certain sources

  8. 62.1-2007 Scope Con’t • 2.9 Acceptable IAQ may not be reached in all buildings meeting these requirements because of special conditions noted • Definition Acceptable Indoor Air Quality: air in which there are no known contaminants at harmful concentrations as determined by cognizant authorities and with which a substantial majority (80% or more) of the people exposed do not express dissatisfaction

  9. General Requirements4.0 Outdoor Air Quality • 4.1 Regional Air Quality • Must determine NAAQS attainment status www.EPA.gov • If nonattainment, air cleaning is required in some cases • 4.2 Local Air Quality • Conduct observational site survey to identify local sources of air contaminants

  10. General Requirements4.0 Outdoor Air Quality • 4.3 Documentation • Regional air quality compliance status • Local survey information • Conclusions regarding acceptability of outdoor air quality

  11. General Requirements 5.0 Systems and Equipment • 5.1 Natural Ventilation. Must meet minimum requirements for location and size of openings • 5.2 Ventilation Air Distribution. • Must provide means to adjust (balance) • Must be sure that mixing occurs in RA/OA mixing plenums

  12. General Requirements 5.0 Systems and Equipment • 5.3 Exhaust Duct Location. Operate exhaust ducts(with harmful contaminants) at negative pressure • 5.4 Ventilation System Controls. Control to assure proper ventilation under any operating condition • 5.5 Airstream Surfaces. Use materials that have documented resistance to microbial growth and erosion

  13. General Requirements 5.0 Systems and Equipment • 5.6 Outdoor Air Intakes. Separate OA intake from outdoor contaminant sources • Must comply with default minimum separation distances in Table 5-1. Examples: • Loading dock 25 ft • Dumpster 15 ft • Surface below intake 1 ft • Cooling tower exhaust 25 ft • Must limit rain water penetration (using hood, proper velocity, etc.) or manage water that penetrates • Must use bird screens and prevent bird nesting

  14. General Requirements 5.0 Systems and Equipment • 5.7 Local Capture of Contaminants. • Discharge air from non-combustion equipment with exhaust vents must be exhausted to outdoors • 5.8 Combustion Air. Provide combustion air and exhaust air for indoor fuel-fired appliances • Products of combustion from vented appliances shall be vented directly outdoors.

  15. General Requirements 5.0 Systems and Equipment • 5.9 Particulate Matter Removal. Use a filter with a MERV 6 (or greater) upstream of dehumidifying coils and other wet-surface devices in supply stream

  16. General Requirements 5.0 Systems and Equipment • 5.10 Dehumidification Systems. • Must limit indoor RH to 65% or less at design dew point condition • Exception to RH limit: where occupancy requirements or processes dictate higher RH conditions. • Intake airflow must be greater than relief/exhaust during cooling (to minimize moist air infiltration)

  17. General Requirements5.10 Dehumidification Systems At 75F, 65% rh gives a 13F “safety margin” before condensation 65% RH limit 62°F DP

  18. General Requirements 5.0 Systems and Equipment • 5.11 Drain Pans. Assure drainage without flooding or carryover • Slope: 1/8” per foot toward outlet • Drain: At lowest point, large enough to prevent overflow • Drain seal: P-trap or other seal for negatively pressurized drain pans to prevent ingestion of air while allowing complete drainage (fan on or off) • Pan size: length at least 1/2 coil height or as necessary to limit carryover

  19. General Requirements 5.0 Systems and Equipment • 5.12 Finned Tube Coils and Heat Exchangers • Use drain pan • Select to limit coil pressure drop to 0.75 in.wc.@ 500 fpm face velocity • If higher pressure drop, provide access on both sides for maintenance

  20. General Requirements 5.0 Systems and Equipment • 5.13 Humidifiers and Water Spray Systems • Use potable water (or better) • No downstream devices within absorption distance • 5.14 Access for Inspection, Cleaning and Maintenance.

  21. General Requirements 5.0 Systems and Equipment • 5.15 Building Envelope and Interior Surfaces • Weather barrier to prevent water penetration into envelope • Vapor retarder or other means to prevent condensation on cold surfaces within envelope • Seal all seams, joints, penetrations to limit infiltration • Insulate pipes, ducts expected to have surface temperature below surrounding dew point

  22. General Requirements 5.0 Systems and Equipment • 5.16 Buildings with Attached Parking Garages. Limit infiltration of vehicular exhaust • Maintain garage pressure at or below adjacent occupied space • Or, use a vestibule • Or, otherwise design to minimize air migration from garage to occupied space

  23. General Requirements 5.0 Systems and Equipment • 5.17 Air Classification and Recirculation. Limit recirculation or transfer of “dirty” air to “cleaner” spaces • 5.17.1 Classification - Designate air leaving each space using Table 6.1 • Class 1: Low contaminant concentration (office) • Class 2: Moderate concentration (dining room) • Class 3: Significant concentration (sick room) • Class 4: Highly objectionable or potentially harmful concentration

  24. General Requirements 5.0 Systems and Equipment • 5.17.1 Classification Manage recirculation as follows • Class 1 to anywhere • Class 2 to self, similar Class 2 or Class 3 or Class 4 • Class 3 to self • Class 4 to outdoors

  25. General Requirements 5.0 Systems and Equipment • 5.17.2 Re-designation of air class • Air Cleaning. May reclassify air cleaned by passing it through an appropriate air-cleaning system • Transfer. Mixed classes are re-designated. • Energy Recovery. Energy recovery from class 2 (exhaust) airstreams must have no more than 10% leakage into a class 1 airstream.

  26. General Requirements 5.0 Systems and Equipment • 5.18 Requirements when building has both ETS and ETS-Free areas. Does not purport to achieve acceptable IAQ in ETS areas. • Spaces must be classified as ETS or ETS-Free • Air must be kept separate by means of walls, automatic door closers and pressurization

  27. General Requirements 5.0 Systems and Equipment • 5.18 (continued) • Recirculation or transfer from ETS to ETS-Free is prohibited • ETS areas must be exhausted to the outdoors

  28. Ventilation Requirements 6.0 Procedures • 6.1 General. Ventilation Rate Procedure or IAQ Procedure for outdoor airflow values for mechanical ventilation systems • 6.1.1 Ventilation Rate Procedure. Prescribes rates & procedures based on typical space contaminant sources & source strengths

  29. Ventilation Requirements 6.0 Procedures • 6.1.2 IAQ Procedure. Requires calculation of rates based on analysis of contaminant sources, concentration targets and perceived air quality targets.

  30. Construction Requirements 7.0 Construction/Start-Up • 7.1 Construction Phase • Don’t operate air handlers without filters • Protect building materials • Protect occupied areas • Limit migration of construction contamination into occupied space

  31. Construction Requirements 7.0 Construction/Start-Up • 7.1.5 Air Duct Construction shall be in accordance with the SMACNA duct construction standards and NFPA standards governing installation of HVAC systems • 7.2 System Start-Up. Balance airflow values, test drain pans, clean up before starting, test damper controls

  32. Construction Requirements 7.0 Construction/Start-Up • 7.2.6 Documents including balance report, construction drawings and design criteria with assumptions shall be provided to Owner

  33. Operating Requirements 8.0 Operation & Maintenance • 8.2 Operations and Maintenance Manual. • Develop and maintain a building operations and maintenance manual which shall include a maintenance schedule with frequencies of tasks. BuildingOperationManual

  34. Operating Requirements 8.0 Operation & Maintenance • 8.3 Ventilation System Operation. Operate in accordance with Building Operations Manual • 8.4 Ventilation System Maintenance. Maintain in accordance with Building Operations Manual.

  35. Operating Requirements 8.0 Operation & Maintenance • 8.4.1.4 Coil drains. Drain pans shall be inspected at least once a year and cleaned if required • 8.4.1.8 Outside Air Flow Verification. For units >2,000 cfm the outside air flow shall be tested a minimum of every 5 years and adjustments shall be made to have the design flow provided to system

  36. ASHRAE 62.1 • Standard is under continuous maintenance process • You can propose a change to the standard • Notice of proposed changes appears in ASHRAE Standards Action • You can comment on proposed changes • You can request an interpretation

  37. ASHRAE 62.1 • User’s manual for 62.1-2007 • IMC & UMC Code adoption • ALI Short Course and Professional Development Course • eLearning course • IAQ Design Guideline is in the works • Next publication of ASHRAE 62.1, 2010

  38. Questions? ASHRAE 62.1 update:Overview - Where are we now?

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