Transcript ANSI/ASHRAE/IESNA Standard 90.1-2004

ANSI/ASHRAE/IESNA
Standard 90.1-2007
Top 10 things you
should know about the
energy standard
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ASHRAE Standard 90.1
Scope of 2007 Update
 Incorporates 42 addenda published since
90.1-2004 was released
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ASHRAE Standard 90.1-2007
Purpose
“… Provide minimum
requirements for the energyefficient design of buildings
except low-rise residential
buildings”
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10
90.1 applies to the
entire building
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10
Applies to Entire Building
 Envelope
 HVAC
 Service water heating
 Power
 Lighting
 Electric motors
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9
Certain system
controls are
mandatory
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9
Mandatory 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
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9
Mandatory 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
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9
Mandatory 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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8
Lighting
requirements
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8
Lighting Power Densities
Building area method
Interior LPD, W/ft²
Space type
90.1-2001
90.1-2007
Hospital
1.6
1.2
Library
1.5
1.3
Manufacturing
2.2
1.3
Museum
1.6
1.1
Office
1.3
1.0
Retail
1.9
1.5
School
1.5
1.2
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8
Lighting Power Densities
Space-by-space method
Interior LPD, W/ft²
Space type
90.1-2001
90.1-2007
Office, enclosed
Office, open plan
Conference
Training
1.5
1.3
1.5
1.6
1.1
1.1
1.3
1.4
Lobby
Lounge
Dining
Food prep
1.8
1.4
1.4
2.2
1.3
1.2
0.9
1.2
May trade power
between spaces
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8
Interior Lighting Control
Must provide:
 At least one control in
each space
 Automatic shutoff for
buildings > 5,000 ft²
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7
Applies to building
alterations and
additions
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7
Alterations and Additions
 Individual components must
comply with requirements
 When changing multiple
components, annual energy
use ≤ compliant design
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6
Limitation on
system fan power
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6 Air System Design &
Control
90.1
2007
Change
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
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90.1
2007
Fan Power Limitation
Change
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
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90.1
2007
prescriptive HVAC requirements
Change
Air System Design & Control
VAV fan control
 Motors ≥ 10 hp require one of
the following:
(was 15 hp)
 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)
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5
Limitation on
reheat 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-solar
energy accounts for 75% of reheat
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simultaneous heating–cooling
Dehumidification Exceptions
 Reducing supply airflow to 50%, or
minimum ventilation rate
 Systems < 6.67 tons that can unload
at least 50%
 Systems < 3.3 tons
 Systems with specific humidity
requirements (museums, surgical suites)
 75% of reheat/recool energy is
site-recovered or site-solar
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4
Requirement for
air- and waterside
energy recovery
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4a
Airside 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

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4b
Waterside Energy Recovery
 Must recover condenser heat for
service 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
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3
Fan pressure
optimization for
DDC/VAV systems
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3
Fan-Pressure Optimization
communicating BAS
VAV damper
position
duct
pressure
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3
Fan-Pressure Optimization
Control logic
Increase duct static setpoint
75%
Damper position
(% open) of
critical VAV box
No action
65%
Reduce duct static setpoint
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2
Mandatory
requirements for
equipment efficiency
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2
Examples of Mandatory Efficiency
Equipment type
Minimum efficiency
Self-contained, water-cooled
w/electric resistance heat
(20–100 tons)
11.0 EER
10.3 IPLV
Water-source heat pump
(1.5–5.25 tons)
12.0 EER (cooling)
4.2 COP (heating)
Centrifugal chiller,
water-cooled ( 300 tons)
6.10 COP
0.576 kW/ton
6.40 IPLV
0.549 IPLV
(at ARI rating conditions)
§6.4.1.1: “… Where multiple rating conditions
or performance requirements are provided, the
equipment shall satisfy all stated requirements …”
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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
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1
Already part of
state/local energy
codes
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ASHRAE Standard 90.1 and
Energy Codes
International Energy Conservation Code
(IECC)
 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
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ASHRAE Standard 90.1 adoption
Outside the U.S.
Canada
Similar or higher
efficiency levels
United States
ASHRAE Standard
90.1-2007
Brazil
Law 10295 (2004),
Energy Efficiency
Standards
China
Modifying for
high local ambient
wet bulbs
Thailand
Major changes
based on building
envelope studies
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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 Criteria
http://www.hnd.usace.army.mil/techinfo/ufc/
081602_UFC3-400-01.pdf
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ASHRAE Standard 90.1 and
LEED®-NC Version
2.2
 EAp2: Minimum energy performance

Mandatory provisions of 90.1-2004 and
 Prescriptive requirements of 90.1-2004
or
 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
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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
ASHRAE Standard 90.1-2007
Availability
www.ashrae.org
 Read online
Members $88
Others $110

Order from bookstore
(electronic or paper)

Check for addenda
(continuous maintenance)

Download compliance
forms
http://www.ashrae.org/template/
TechnologyLinkLanding/category/1638
Members $74
Others
$93
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ANSI/ASHRAE/IESNA
Standard 90.1-2007
Questions?
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