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© 2009 Trane
ANSI/ASHRAE/IESNA
Standard 90.1-2007
Top 10 things youshould know about the energy standard
© 2009 Trane
ASHRAE Standard 90.1
Scope of 2007 Update
Incorporates 42 addenda published since 90.1-2004 was released
© 2009 Trane
ASHRAE Standard 90.1-2007
Purpose
“… Provide minimum requirements for the energy-efficient design of buildings except low-rise residential buildings”
© 2009 Trane
1090.1 applies to the entire building
© 2009 Trane
10Applies to Entire Building
Envelope
HVAC
Service water heating
Power
Lighting
Electric motors
© 2009 Trane
9Certain system controls are mandatory
© 2009 Trane
9Mandatory System Controls
Deadband: ≥ 5° F
Automatic shutdown (systems ≥ 15,000 Btu/h) 7-Day time schedules with
10-hr battery backup, or Occupancy sensor, or Manually operated timer
with 2-hr max duration, or Security system interlock
© 2009 Trane
9Mandatory System Controls
Setback(Requirements vary for different cooling and heating climates)
Optimum start if system supply air> 10,000 cfm
Automated shutoff control Ventilation (outdoor-air) dampers Exhaust dampers
© 2009 Trane
9Mandatory System Controls
Zone isolation 25,000 ft² maximum zone size on one floor Shut off airflow Central systems capable of stable operation
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8Lighting requirements
© 2009 Trane
1.2
1.3
1.3
1.1
1.0
1.5
1.2
90.1-2007
8Lighting Power Densities
Interior LPD, W/ft²
Hospital 1.6
Library 1.5
Manufacturing 2.2
Museum 1.6
Office 1.3
Retail 1.9
School 1.5
Space type 90.1-2001
Building area method
© 2009 Trane
8Lighting Power Densities
Space type 90.1-2001 90.1-2007
Interior LPD, W/ft²
Office, enclosed 1.5 1.1
Office, open plan 1.3 1.1
Conference 1.5 1.3
Training 1.6 1.4
Lobby 1.8 1.3
Lounge 1.4 1.2
Dining 1.4 0.9
Food prep 2.2 1.2
May trade powerbetween spacesMay trade powerbetween spaces
Space-by-space method
© 2009 Trane
8Interior Lighting Control
Must provide:
At least one control in each space
Automatic shutoff for buildings > 5,000 ft²
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7Applies to building alterations and additions
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7Alterations and Additions
Individual components must comply with requirements
When changing multiple components, annual energy use ≤ compliant design
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6Limitation onsystem fan power
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6 Air System Design & Control
Fan system power limitation: Applies to systems > 5 hp
Option Constant volume Variable volume
1) Nameplate hp hp ≤ CFMs x 0.0011 hp ≤ CFMs x 0.0015
2) System bhp bhp ≤CFMs x 0.00094 + A bhp ≤CFMs x 0.0013 + A
90.12007Change
90.12007Change
© 2009 Trane
Fan Power Limitation Pressure Drop Adjustment
A = Σ (PD x CFMdesign / 4131)
PD specified for Ducts Filters Gas-phase air cleaners Heat recovery devices Sound attenuation sections Other devices
90.12007Change
90.12007Change
© 2009 Trane
prescriptive HVAC requirements
Air System Design & Control
VAV fan control Motors ≥ 10 hp require one of
the following: Variable-speed drive Vaneaxial fan with variable-pitch blades Design wattage ≤ 30% at 50% air volume
DDC systems must include setpoint reset (fan-pressure optimization)
(was 15 hp)
90.12007Change
90.12007Change
© 2009 Trane
5Limitation onreheat with new energy
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simultaneous heating–cooling
Zone-Control Exceptions
Airflow must not exceed the larger of: Standard 62’s for requirements zone OA or 0.4 cfm/ft² or 30% of supply air or 300 cfm or Standard 62’s multiple-space
requirements
Site-recovered or site-solarenergy accounts for 75% of reheat
© 2009 Trane
simultaneous heating–cooling
Dehumidification Exceptions
Reducing supply airflow to 50%, or minimum ventilation rate
Systems < 6.67 tons that can unloadat least 50%
Systems < 3.3 tons
Systems with specific humidity requirements (museums, surgical suites)
75% of reheat/recool energy issite-recovered or site-solar
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4Requirement forair- and waterside energy recovery
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4aAirside Energy Recovery
Required if: Supply air capacity ≥ 5,000 cfm Minimum outdoor air ≥ 70%
Recovery system effectiveness ≥ 50%
Exceptions Labs, toxic exhaust, etc. Largest exhaust < 75% outdoor air Heating systems in hot climates Cooling systems in cool, marine climates
© 2009 Trane
4bWaterside Energy Recovery
Must recover condenser heat forservice water heating (SWH) if: Facility operates “24/7” and Heat rejection > 6,000,000 Btu/h and Design SWH load > 1,000,000 Btu/h
Where required, meet smaller of: Recover 60% of rejected condenser heat or Preheat water to 85°F
© 2009 Trane
3Fan pressure optimization forDDC/VAV systems
© 2009 Trane
3Fan-Pressure Optimization
communicating BAS
ductpressure
VAV damperposition
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3Fan-Pressure Optimization
Damper position(% open) of
critical VAV box
75%
65%
Increase duct static setpoint
Reduce duct static setpoint
No action
Control logic
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2Mandatory requirements for equipment efficiency
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2Examples of Mandatory Efficiency
§6.4.1.1: “… Where multiple rating conditionsor performance requirements are provided, the equipment shall satisfy all stated requirements …”
Equipment type Minimum efficiency
Self-contained, water-cooled 11.0 EERw/electric resistance heat 10.3 IPLV(20–100 tons)
Water-source heat pump 12.0 EER (cooling)(1.5–5.25 tons) 4.2 COP (heating)
Centrifugal chiller, 6.10 COP 0.576 kW/ton water-cooled ( 300 tons) 6.40 IPLV 0.549 IPLV
(at ARI rating conditions)
© 2009 Trane
VFDs and Centrifugal Chillers
“… Where multiple rating conditions or performance requirements are provided, the equipment shall satisfy all stated requirements, unless otherwise exempted by footnotes in the table …”
from ASHRAE 90.1-2007,Section 6.4.1.1, Minimum Equipment Efficiencies
“… If a frequency conversion device or motor starter is furnished as part of the compressor circuit, the compressor power input shall be measured at the input terminals of the frequency converter or motor starter”
from ARI Standard 550/590-1998
Must meet full-load and part-load requirements
© 2009 Trane
1Already part of state/local energy codes
© 2009 Trane
ASHRAE Standard 90.1 and
Energy Codes
IECC–Chapter 8 adopts 90.1-2004 by reference
IECC–Chapter 7 describes an alternate path for compliance Includes many provisions of 90.1-2004 ASHRAE is proposing code changes to
increase stringency
International Energy Conservation Code(IECC)
© 2009 Trane
ASHRAE Standard 90.1 adoption
Outside the U.S.
United StatesASHRAE Standard90.1-2007
ThailandMajor changesbased on buildingenvelope studies
CanadaSimilar or higherefficiency levels
BrazilLaw 10295 (2004),Energy EfficiencyStandards
ChinaModifying forhigh local ambientwet bulbs
© 2009 Trane
ASHRAE Standard 90.1 adoption by
U.S. Department of Defense
“2-1 MANDATORY ENERGY AND WATER CONSERVATION CRITERIA. Family housing (residential) shall be designed and constructed in accordance with the latest Energy Star standards, per other appropriate service-specific criteria and guidance. Other facilities shall be designed and constructed in accordance with the latest edition of ASHRAE Standard 90.1.”
—Excerpt from Unified Facilities Criteriahttp://www.hnd.usace.army.mil/techinfo/ufc/081602_UFC3-400-01.pdf
© 2009 Trane
ASHRAE Standard 90.1 and
LEED®-NC Version 2.2
EAp2: Minimum energy performance Mandatory provisions of 90.1-2004 and
Prescriptive requirements of 90.1-2004or
Performance requirements of 90.1-2004 Section 11
EAc1: Optimize energy performance Awards points for improving performance
rating of the design building vs. baseline building per 90.1-2004
© 2009 Trane
LEED NC 2009 : EAp2
Minimum energy performance Option 1: performance compliance path
Mandatory provision (5.4, 6.4, 7.4, 8.4, 9.4, and 10.4) Baseline building complies with Appendix G Building PRM 10% better than 90.1-2007 for new construction, 5% better
for existing building
Option 2: prescriptive compliance path ASHRAE AEDG
small office buildings 2004 small retail buildings 2006 small warehouses and self-storage buildings 2008
Option 3: prescriptive compliance path Advanced Buildings Core Performance Guide
© 2009 Trane
Members $74Others $93
ASHRAE Standard 90.1-2007
Availability
www.ashrae.org Read online Order from bookstore
(electronic or paper) Check for addenda
(continuous maintenance) Download compliance
forms
Members $88Others $110
http://www.ashrae.org/template/TechnologyLinkLanding/category/1638
© 2009 Trane
ANSI/ASHRAE/IESNA
Standard 90.1-2007
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