ASHRAE Standard 62 – What Now?daytonashrae.org/downloads/presentations/ASHRAE_Dayton_62.pdf ·...
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Transcript of ASHRAE Standard 62 – What Now?daytonashrae.org/downloads/presentations/ASHRAE_Dayton_62.pdf ·...
Alec Carnes PE, LEED APAlec Carnes PE, LEED AP
© Heapy Engineering LLC All Rights Reserved
IAQ Design Overview
ASHRAE Standard 62 – What Now?
Program / Learning ObjectivesProgram / Learning Objectives
!! Importance of Building IAQImportance of Building IAQ!! ASHRAE 62.1ASHRAE 62.1--2007 Overview2007 Overview!! Ventilation EffectivenessVentilation Effectiveness!! Variations in Occupancy or AirflowVariations in Occupancy or Airflow!! Relationship to USGBC LEEDRelationship to USGBC LEED--NC v 2.2NC v 2.2
Why is IAQ Important?
!! Not Just Code ComplianceNot Just Code Compliance!! Medical Liability Concerns Medical Liability Concerns !! Employee Health ConcernsEmployee Health Concerns!! Cost of Poor IAQCost of Poor IAQ
Medical Liability Concerns:Medical Liability Concerns:!! ADA requirements of ADA requirements of biobio--chemically chemically
handicappedhandicapped –– describes people with describes people with multiple chemical sensitivity (MCS)multiple chemical sensitivity (MCS)
!! Poor IAQ (a.k.a Sick Building Syndrome Poor IAQ (a.k.a Sick Building Syndrome ––SBS) is the leading cause of MCS SBS) is the leading cause of MCS according to the World Health according to the World Health OrganizationOrganization
Indoor Air Quality
Medical Liability Concerns:!! EPA stated that the health risks EPA stated that the health risks
associated with breathing associated with breathing indoorindoor air are air are 2 to 5 times the risk of breathing 2 to 5 times the risk of breathing outdooroutdoorair.air.
!! EPA has poor IAQ cited as the 4EPA has poor IAQ cited as the 4thth
highest cancer risk (3500 to 6000 annual highest cancer risk (3500 to 6000 annual deaths)deaths)
Indoor Air Quality
Medical Liability Concerns:!! World Health Organization estimates that World Health Organization estimates that
30% of all buildings suffer from Sick 30% of all buildings suffer from Sick Building Syndrome.Building Syndrome.
!! Improved IAQ in buildings aids in Improved IAQ in buildings aids in protecting Owners, Developers, and protecting Owners, Developers, and Professional Consultants.Professional Consultants.
Indoor Air Quality
IAQ and the Building Code:!! IMC/OMC Chapter 4 IMC/OMC Chapter 4 –– VentilationVentilation
!! Based on ASHRAE 62Based on ASHRAE 62--19991999!! Prescriptive Requirements for Prescriptive Requirements for
VentilationVentilation!! Permits Permits ““Engineered SystemsEngineered Systems””
based on ASHRAE 62.1based on ASHRAE 62.1--2004 or 2004 or most recent versionmost recent version
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Ventilation for Acceptable Indoor Air Ventilation for Acceptable Indoor Air
Quality StandardQuality Standard!! Industry Standard of Care for IAQ Industry Standard of Care for IAQ
Systems Design and EvaluationSystems Design and Evaluation!! Prerequisite for the LEED Prerequisite for the LEED –– NC v2.2 NC v2.2
Building Rating System (EQp1: Minimum Building Rating System (EQp1: Minimum IAQ Performance)IAQ Performance)
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Options for ComplianceOptions for Compliance!! Outdoor Air QualityOutdoor Air Quality
!! Standard requires a survey of the Standard requires a survey of the project site to determine quality of project site to determine quality of OAOA
!! Limit values for various air Limit values for various air contaminantscontaminants
!! Ohio EPA WebsiteOhio EPA Website
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Options for ComplianceOptions for Compliance!! Natural VentilationNatural Ventilation
!! Based on Space Floor Area Based on Space Floor Area –– Both Both Interior and Perimeter SpacesInterior and Perimeter Spaces
!! Limitation on Distance of Interior Limitation on Distance of Interior Spaces from Perimeter OpeningsSpaces from Perimeter Openings
!! Acceptable for Compliance to USGBC Acceptable for Compliance to USGBC LEEDLEED--NC v 2.2 EAp1 NC v 2.2 EAp1 –– Minimum IAQ Minimum IAQ PerformancePerformance
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Options for ComplianceOptions for Compliance!! Ventilation Rate ProcedureVentilation Rate Procedure
!! Forced Airflow to Building SpacesForced Airflow to Building Spaces!! Must provide the required airflow Must provide the required airflow
throughthrough--out the occupied range of out the occupied range of operationoperation
!! Must be appropriately dehumidified Must be appropriately dehumidified to limit moisture problemsto limit moisture problems
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Ventilation Rate ProcedureVentilation Rate Procedure
!! Required ventilation is calculated based Required ventilation is calculated based on occupancy and floor areaon occupancy and floor area
!! This differs from the previous Standard This differs from the previous Standard (OBC) and can result in reduced airflow (OBC) and can result in reduced airflow requirementsrequirements
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Ventilation Rate ProcedureVentilation Rate Procedure
!! ReRe--circulation (Return) Air now classified circulation (Return) Air now classified by space typeby space type
!! Class 1 thru Class 4Class 1 thru Class 4!! Limits what classification of air that can Limits what classification of air that can
be returnedbe returned
!! This is more stringent than the previous This is more stringent than the previous version of the Standard (OBC)version of the Standard (OBC)
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Ventilation Rate ProcedureVentilation Rate Procedure!! MultiMulti--Zone Systems Zone Systems –– Typical ApplicationTypical Application
!! Each Space OA Requirement is calculated Each Space OA Requirement is calculated as a ratio to the heatas a ratio to the heat--load required airflowload required airflow
!! The highest ratio governs the entire The highest ratio governs the entire systemsystem
!! This is similar to the previous Standard This is similar to the previous Standard (OBC), but updated to reflect the new (OBC), but updated to reflect the new Occupancy and Area requirementsOccupancy and Area requirements
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Ventilation Rate ProcedureVentilation Rate Procedure
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Ventilation Rate ProcedureVentilation Rate Procedure
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Ventilation Rate ProcedureVentilation Rate Procedure!! Diversity and Variable OccupancyDiversity and Variable Occupancy
!! Diversity in Overall Building Occupancy is Diversity in Overall Building Occupancy is applied at the System Levelapplied at the System Level
!! Short Term Occupancy of each Space may Short Term Occupancy of each Space may be evaluated during the Occupied time be evaluated during the Occupied time periodperiod
!! Classroom, Theaters, LobbiesClassroom, Theaters, Lobbies
!! Limited in the previous versionLimited in the previous version
Indoor Air Quality
Variable Occupancy ExampleIndoor Air Quality
Interrupted Airflow ExampleIndoor Air Quality
ASHRAE 62.1-2007 Basics:!! IAQ Procedure for VentilationIAQ Procedure for Ventilation!! Performance Based Calculation and Performance Based Calculation and
ModelingModeling!! Contaminant SourcesContaminant Sources!! Contaminant ConcentrationsContaminant Concentrations!! Target Contaminant LevelsTarget Contaminant Levels!! Perceived IAQPerceived IAQ!! Air cleaning systemsAir cleaning systems
Indoor Air Quality
IAQ Procedure System Options:!! Mechanical Air CleaningMechanical Air Cleaning
!! Treat Airborne ContaminantsTreat Airborne Contaminants!! Particulate and Vapor (Fume)Particulate and Vapor (Fume)
!! Permits rePermits re--circulation of air and reduction of circulation of air and reduction of outdoor air requirementsoutdoor air requirements
!! Effective when ambient outdoor air quality is Effective when ambient outdoor air quality is subsub--standard standard –– Urban EnvironmentsUrban Environments
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! IAQ Procedure for VentilationIAQ Procedure for Ventilation!! Acceptable for Alternative Compliance to Acceptable for Alternative Compliance to
IMC/OMC IMC/OMC –– Chapter 4Chapter 4!! NOT Acceptable for Compliance to NOT Acceptable for Compliance to
USGBC LEEDUSGBC LEED--NC v2.2 EQp1 NC v2.2 EQp1 –– Minimum Minimum IAQ PerformanceIAQ Performance
Indoor Air Quality
ASHRAE 62.1-2007 Basics:!! Construction & StartConstruction & Start--up Requirementsup Requirements
!! Requires protection of occupied spaces Requires protection of occupied spaces adjacent to construction zonesadjacent to construction zones
!! Required Air Balance of SystemsRequired Air Balance of Systems!! Testing of Condensate Drain PansTesting of Condensate Drain Pans
!! Similarly Similarly –– ASHRAE 90.1 requires ASHRAE 90.1 requires commissioning of M/E Systems in commissioning of M/E Systems in buildings exceeding 50,000 SFbuildings exceeding 50,000 SF
Indoor Air Quality
Summary:!! ASHRAE 62.1ASHRAE 62.1--2007 is significantly more complex 2007 is significantly more complex
than current IMC/OMC requirements for than current IMC/OMC requirements for ventilationventilation
!! Generally, ASHRAE 62 will result in reduced Generally, ASHRAE 62 will result in reduced outdoor airflow requirements and, therefore, outdoor airflow requirements and, therefore, reduced energy consumptionreduced energy consumption
!! USGBC LEEDUSGBC LEED--NC v 2.2 has differing NC v 2.2 has differing requirements than IMC/OMC for minimum requirements than IMC/OMC for minimum ventilation requirementsventilation requirements
Indoor Air Quality
Questions?Questions?
IAQ Design Overview
ASHRAE Standard 62 – What Now?
Thank you!Thank you!Resources:www.ashrae.orgwww.usgbc.orgwww.heapy.com
© Heapy Engineering LLC All Rights Reserved
IAQ Design Overview
ASHRAE Standard 62 – What Now?