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ANSI/ASHRAE/IESNA

Standard 90.1-2007

Top 10 things youshould 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 energy-efficient design of buildings except low-rise residential buildings”

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1090.1 applies to the entire building

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10Applies to Entire Building

Envelope

HVAC

Service water heating

Power

Lighting

Electric motors

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9Certain system controls are mandatory

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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3Fan pressure optimization forDDC/VAV systems

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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)

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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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1Already part of state/local energy codes

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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)

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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

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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 Criteriahttp://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 90.1-2004or

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

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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

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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

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ANSI/ASHRAE/IESNA

Standard 90.1-2007

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