what is ashrae 90.1?
DESCRIPTION
MIke Tillou, PE, LEED AP, delivered this presentation to the Boston ASHRAE chapter.TRANSCRIPT
What is ASHRAE 90.1?
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What is ASHRAE 90.1-2010?
1
Learning Objectives
P id i f ASHRAE St d d 90 1 i l di hi t- Provide an overview of ASHRAE Standard 90.1, including history, scope, and process for maintaining the standards
- Describe the energy savings comparison of 90.1-2010 to 90.1-2004- Discuss approved changes to 90.1-2010- Describe future improvements for 90.1-2013
What is ASHRAE 90.1?
Mi i St d d f th- Minimum Standard for the energy efficiency of buildings and building components.
- Covers:- Building Envelope- Heating, Ventilation and Air
Conditioning EquipmentConditioning Equipment- Lighting- Service Water Heating- Some building process loads- Electrical motors and transformers
History of ASHRAE 90.1
Consensus Standard:- Stakeholders include: manufacturer’s, designers,
code officials, trade organizations and user groups.- All changes must be moved forward and approved by g y
a majority of the members on the committee- Follows the requirements established by ANSI.
Cost effective:- All items are evaluated for cost effectiveness
Prescribed set of financial criteria updated every 3- Prescribed set of financial criteria updated every 3 years
- This is a unique feature of ASHRAE 90.1.
Regionalization by Climate Zone
DRY (B) MOIST (A)MARINE (C)
Warm-Humid below White Line
Continuous Maintenance:- Began in 2001- New versions every 3 years - Addendum published continuouslyy- Full Committee meetings 4 times a year- Monthly Sub-committee calls
Sub-Committees:- Building Envelope
Mechanical- Mechanical- Electrical- Energy Cost Budget
F t d C li- Format and Compliance
Compliance with Standard 90.1
Appendix G Performance Rating Method
M th d l t l l t th f b d- Methodology to calculate the energy performance beyond the minimum requirements of the standard.
- Requires hourly energy simulation.
- Establishes the baseline reference building criteria
Appendix G is referenced by
- USGBC for LEED energy performance credits
- The Federal Building Energy Tax credit
- ASHRAE Standard 189.1 Green Building Standard
- Local green building standards
ASHRAE 90.1-2010
Why?
Why?
Measuring Our Progress - PNNL Progress Indicator
Progress Indicator Construction Weighting
B ildi t t 80% f t ti- Building prototypes cover 80% of construction area
- Assigned by areag yMaximum impact by area: Retail, warehouse, apartment, education, office
- Assigned by climate zoneAssigned by climate zoneMaximum impact by climateo Zones 3-5 have 73% of construction volumeo Zones 2-5 have 91% of construction volumeo Zones 2 5 have 91% of construction volume
Energy Performance Results by Prototype
Did we reach our goal?
QUESTIONS?
How did we get there?
New Addenda
Addenda Goals
Technically justifiedTechnically justified
Simplicity
Flexibility
Enforceable
What’s New in ASHRAE 90.1-2010?
R i d Titl P d SRevised Title Purpose and Scope
Building EnvelopeC ti Ai B iContinuous Air BarrierConstrained Glazing RequirementsMinimum Skylight Areas
HVAC ImprovementsEquipment EfficienciesWaterside Design gAirside DesignOutside Air
Li hti I tLighting Improvements
Title Purpose and Scope
2 SCOPE2. SCOPE2.1 This standard provides:
a. minimum energy-efficient requirements for the design, construction and a plan for operation and maintenance of:construction, and a plan for operation and maintenance of:- new buildings and their systems- new portions of buildings and their systems
t d i t i i ti b ildi- new systems and equipment in existing buildings- new equipment or building systems specifically
identified in the standard that are part of industrial or manufacturing processesor manufacturing processes
b. criteria for determining compliance with these require-ments.
Addition allows previously un-regulated energy uses to be brought into the scope of the standard
Addenda Finished but not Approved
•BB – Envelope, opaque and fenestration*•BU – Datacenters*BU Datacenters•CX – 40% WWR option*•CY – Economizers*•DF – Elevators* - Denotes high profile addenda
Addenda Finished but not Approved
Addendum bb Increased Wall InsulationAddendum bb - Increased Wall InsulationExample –Zone 5 Steel Framed•
2.67”
What’s New in 90.1-2010 – Building Envelope
Building Envelope –Air Barrier (bf)
- clearly identify components on construction documents.
- Detail all joints, interconnections, and penetrations
- Shall extend over all surfaces of the building envelope
Sh ll b d i d t i t i ti d- Shall be designed to resist posi-tive and negative pressures from wind, stack effect, and mechanical ventilation.
What’s New in 90.1-2010 – Building Envelope
M S th l i th E t W t (b )More South glazing than East or West (bn)- Building orientation- Land purchases and campus planning- No public review comments
Exceptions- Storefront, - Shaded building, Infill with nearby building on south, - Alterations with no increase in glazingg g
What’s New in 90.1-2010 – Building Envelope
Addi i l R iAdditional Requirements:
Cool roofs required in Zones 1-3q
Minimum Skylight area t th 5 000 ft ith- spaces greater than 5,000 sq.ft. with
ceilings > 15’- daylight area under skylights = ½ floor area
under the skylightunder the skylight
Suggestions for Compliance – Building Envelope
1. Plan building orientation early
2. Shade glass or use low SHGF
3. ‘Super’ glass & ‘Envelope Trade-off Option’
4 E l i t ti f hit t d4. Early integration of architecture and MEP engineering•
- Envelope design affects HVAC designp g g
- Energy modeling for comparing options and balancing efficiency with cost
What’s New in 90.1-2010 – HVAC
SScope- Equipment efficiency ratings- Energy recovery- Economizers- Duct sealing and leakage- Fan Power- Reheat limitations
What’s New in 90.1-2010 – HVAC
E i t Effi i ChEquipment Efficiency Changes - Unitary air conditioners and heat pumps - Single-zone VAV - Water-cooled and evap cooled air cond. and heat pumps. - Packaged terminal air conditioners and heat pumps - Water-to-water heat pumps- Water-to-water heat pumps - Computer room air conditioners (CRAC). - Variable-refrigerant-flow (VRF) multi-splits. - Chillers. - Glycol or brine in chillers - Cooling Towers- Liquid-to-liquid heat exchangers. - Heat pump pool heaters- Furnaces & water heatingFurnaces & water heating
What’s New in 90.1-2010 – HVAC
Waterside System DesignWaterside System Design - Two-position valves in water-cooled unitary products.
- Variable-flow and variable-speed pumping. p p p g
- Service water booster systems
- Pump pressure optimization
- Maximum flows in nominal pipe sizes.
- Pump head calculations
- Pipe insulation- Pipe insulation.
What’s New in 90.1-2010 – HVAC
M i fl i i l i iMaximum flows in nominal pipe sizes.
What’s New in 90.1-2010 – HVAC
Ai D i d C lOutdoor Air Design and Control- Economizers.
- Heat recovery economizer exception- Heat recovery economizer exception.
- Data center exceptions for air economizers.
- Waterside economizers for data centers.
- Dampers.
- Exhaust air energy recovery
Z l l d d t ll d til ti (DCV)- Zone-level demand-controlled ventilation (DCV).
- Ventilation optimization (ventilation reset).
- Garage ventilation controlsg
What’s New in 90.1-2010 – HVAC
Ai id E iAir-side Economizers-
What’s New in 90.1-2010 – HVAC
Economizer ExceptionsEconomizer Exceptions-
What’s New in 90.1-2010 – HVAC
Ai id D i d C t lAirside Design and Control- Supply air reset controls.
- Dual maximum control on VAV boxes.Dual maximum control on VAV boxes.
- Overhead heating temperature limit.
- VAV control on lab exhaust systems.
- VAV requirements for chilled water air-handling units serving a single-zone.
- Fan power limitation p
- Heat recovery pressure drop adjustments .
- Kitchen exhaust hoods
- Duct leakage —class A
What’s New in 90.1-2010 – HVAC
D l i l VAV bDual maximum control on VAV boxes.
What’s New in 90.1-2010 – HVAC
E R R iEnergy Recovery Requirements
What’s New in 90.1-2010 – Lighting
CCovers- Interior spaces of buildings
- Exterior building featuresExterior building features
- Exterior grounds lighting powered through the buildingE tiExceptions
- Emergency lighting that is normally off
- Lighting required by life safety statute
- Lighting in dwelling units
What’s New in 90.1-2010 – Lighting
Lighting Power Density changes
The LPD for most building areas and spaceThe LPD for most building areas and space types were reduced but in some instances the LPD was increased.
What’s New in 90.1-2010 – Lighting
Li hti ChLighting Changes
Exit Signs Limited to 5 Watts
Exterior allowance adjustments
Extended shutoff requirements to buildings <5,000 SF
Requires “manual on” for most lighting controls
Modified to only allow 50% on
Daylight switching requirements for areas with >1,000 SF of day-lit space
Allows a LPD credit if controls are added in addition to mandatory requirementsAllows a LPD credit if controls are added in addition to mandatory requirements
What’s New in 90.1-2010 – Lighting
A t ti D li hti C t l f P iAutomatic Daylighting Controls for Primary Sidelighted Areas > 1,000 sq.ft..
Suggestions for compliance – Lighting
S ti f liSuggestions for compliance- Minimize incandescent use
- Use efficient sources –e.g. super T-8Use efficient sources e.g. super T 8
- Use efficient fixtures
- Vary lighting levels according to need
- Incorporate automatic lighting controls
- Look for daylighting opportunities
What’s Next: 90.1-2013
ASHRAE Standard 90.1-2013
Expand to new areasCommercial/industrial equipmentWhere to startIdentify & engage stakeholders
Workplan Goal –Workplan Goal 40% Whole Building energy savings over 90.1-2004
90.1-2013 Looking Forward
1 Wh l B ildi D i Li k d C i i1. Whole Building Design – Linked Criteria2. Pilot a performance based compliance path
90.1-2013 Looking Forward
Changes Already Approved for Public Review
Exterior Wall Insulation improvements(Finally!)
Escalator/Moving Sidewalk controls
Maximum Glazing percentages by Building type in Appendix G
Efficiency Requirements for Commercial Refrigeration Equipment
Minimum Efficiencies for Air-to-Water ground source and ground water heat pumps
Minimum Transformer Efficiency requirements
90.1-2013 – Looking Forward
Ideas are welcome
Questions?Questions?
For more information please contact:
Mike TillouMike TillouCannon Design716.774.3550MTillou@cannondesign [email protected]
This concludes The American Institute of Architects Continuing Education Systems Program