2009 IECC VS ASHRAE 90.1 MASTER 121410

Insert power co logos…

2009 Interna3onal Energy Conserva3on Code

Comparing IECC 2009 & ASHRAE 90.1-‐2007

Thank You for AJending!

Your Instructors: Ken Baker -‐ K energy Sharon PaJerson -‐ Eco Edge

Acknowledgements The following were either financial or content contributors to this training: The following were either financial or content contributors to this training: •  Utah State Energy Program •  Questar Gas Company •  Rocky Mountain Power Company •  Northwest Energy Efficiency Alliance (NEEA) •  Eric Makela – BriJMakela Group •  Pacific Northwest Labs •  Department of Energy (DOE) •  Washington State University & Rich Prill •  Building Codes Assistance Project •  Maryland Department of Housing and Community Development •  Mike DeWein, BCAP/Alliance to Save Energy •  K energy •  Eco Edge


Overview of Key Differences

ASHRAE/IESNA Standard 90.1-‐2007

  Slight changes to ligh3ng requirements

  More stringent ves3bule requirements

  Performance approach

New ASHRAE Standard

•  Defini3on of “residen3al” building •  Semi-‐heated space designa3on (3.4 Btu/h/h2 to 15 or 20) •  Glazing within 15 to 30 degrees of ver3cal & skylight maximums •  Window-‐to-‐Wall-‐Ra3o (WWR) •  Provisions for above-‐ and below-‐grade walls •  Thermal requirements for opaque and non-‐opaque assemblies •  Allowable maximum U-‐factor •  Allowable damper leakage rates •  HVAC equipment oversizing •  Opera3on and Maintenance (O&M) Manuals •  Certain HVAC equipment systems •  Space-‐by-‐Space method to ligh3ng power density limits •  Ligh3ng controls, allowances, excep3ons and exterior LPDs

Key Differences – ASHRAE vs. IECC

Source Comparison of Standard 90.1-07 and the 2009 IECC

with Respect to Commercial Buildings Prepared by the Pacific Northwest National

Laboratory for the U.S. Department of Building Energy Codes Program

December 2009

http://www.energycodes.gov/publications/research/documents/codes/90-1_iecc_comparison_final_12-16-2009.pdf

Helpful Inform

a3on

Defini3on of “residen3al” building

ASHRAE 90.1-2007 IECC 2009

Spaces in buildings used primarily for living and sleeping. Residential spaces include dwelling units, hotel/motel guest rooms, dormitories, nursing homes, patient rooms in hospitals, lodging houses, fraternity/sorority houses, hostels, prisons, and fire stations.

Includes R-3 buildings, as well as R-2 and R-4 buildings three stories or less in height above grade. (not R-1, hotels and motels) All else is considered commercial.

Result: In some instances, a building built to the 2009 IECC would have less rigorous thermal envelope provisions than if built to ASHRAE 90.1-‐07.


Scope & Applica3on

OR

But Not Both

Either

501.1 Scope Pick Only One Compliance Approach

Code Compliance Process Must the Project Comply with the

IECC?

Comply with the Envelope

Requirements

Comply with the Mechanical/SWH

Requirements

Comply with the Power & Lighting

Requirements

Section 502 90.1 Section 5 Sections 503 and 504 90.1 Section 6 Section 505 90.1 Section 9

Document Compliance with

the IECC

Plan Review

Inspection


Commercial Envelope Requirements

What is the Building Thermal Envelope?

Roof/Ceiling Assembly

Wall Assembly

Ver3cal Fenestra3on and Skylights

Floor Assembly

Slab Edge

Below Grade Wall Assembly

Semi-‐heated space designa3on

ASHRAE 90.1-2007 IECC 2009

Has a specific designation of semi-heated space (3.4 Btu/h/ft2 up to 15 or 20 for climate zone 5 or 6) and comparable thermal envelope provisions that are less rigorous than those for heated spaces. (Tables 5.5-1 through 5.5-8 for the appropriate climate zone)

No such provision for semi-heated; only conditioned or unconditioned. (Table 502.2(1))

Result: Semi-‐heated spaces under Standard 90.1-‐07 generally have more rigorous thermal envelope requirements under 2009 IECC.

Climate Zones – 2009 IECC

IECC Table 502.2(1) – Climate Zone 5

ASHRAE Table 5.5-‐5

IECC Table 502.3

ASHRAE Table 5.5-‐5

IECC Tables 303.1.3(1) and (2) Default U-‐Factors

TABLE 303.1.3(1) DEFAULT GLAZED FENESTRATION U-FACTOR

TABLE 303.1.3(2) DEFAULT DOOR U-FACTORS

Labeling of Fenestra3on Products

ASHRAE 5.8.2.2

All manufactured fenestra/on products shall have a permanent nameplate . . .

Excep/on

When the fenestra3on product does not have such nameplate, the installer or supplier of such fenestra3on shall provide a signed and dated cer3fica3on for the installed

fenestra3on lis3ng the U-‐factor, SHGC, and the air leakage rate.

Glazing within 15 to 30˚ of ver3cal

ASHRAE 90.1-2007 IECC 2009

Considers glazing less than 60 degrees from the horizontal plane as skylights.

Considers glazing 15 degrees or less from vertical as skylights. (Glazing over 15 degrees from vertical is part of the wall.)

Result: Glazing in the 15 to 30-‐degree range under ASHRAE 90.1-‐07 would be considered skylights rather than ver3cal fenestra3on and, as such, could have lesser thermal requirements than under IECC 2009.

IECC Vs. ASHRAE Skylights and Walls

IECC 15 + degrees = Skylight ASHRAE 31 + degrees = Skylight

Roof/Skylight Area Roof/Skylight Area

Skylight Maximum

ASHRAE 90.1-2007 IECC 2009

The total skylight area shall be less than 5% of the gross roof area.

The total skylight area shall not exceed 3% of the gross roof area.

Result: IECC 2009 allows less skylight area.

Window-‐to-‐Wall-‐Ra3o (WWR)

ASHRAE 90.1-2007 IECC 2009

A WWR of less than 40% allows using a provision parallel to 2009 IECC.

ASHRAE allows you to exceed 40% window to wall area.

Glazing beyond the 40% maximum WWR requires a building to be evaluated under ASHRAE 90.1-2007.

Result: The WWR could be calculated differently under each op3on and cause confusion over which provisions to follow. Determining the % can also vary because of the difference in skylight defini3ons.

Provisions for above-‐ & below-‐grade walls

ASHRAE 90.1-2007 IECC 2009

Portions of walls above grade are treated as above grade and portions of the same walls that are below grade are treated as below grade.

Any wall that is <15% above grade and 85% or more below grade is considered entirely a below-grade wall. Similarly, a wall >15% above grade would be considered entirely an above-grade wall.

Result: Provisions for below-‐grade walls are generally less stringent than above-‐grade walls, and since a rela3vely small frac3on (15%) above grade pushes the en3re wall toward more rigorous above-‐grade criteria under the 2009 IECC, then IECC may be more stringent on average.

Opaque and non-‐opaque assemblies

ASHRAE 90.1-2007 IECC 2009

Doors that are more than one-half glass are considered fenestration.

Opaque doors are doors having less than 50% glass area and should b e considered as part of the gross area of above-grade walls that are part of the building envelope.

Result: The thermal requirements for opaque and non-‐opaque assemblies are not always iden3cal between the two documents, and in some instances ASHRAE 90.1-‐07 is more stringent and in others IECC 2009 is more stringent. For example, in climate zone 5, swinging opaque doors have an assembly maximum o U-‐0.500 in ASHRAE (residen3al) but U-‐0.70 in IECC 2009 Group R.

502.2.7 Opaque Doors

Doors having < 50% glass area

Swinging doors   Meet U-‐factor requirement

Roll-‐up of sliding doors   Climate Zones 1 – 3: U-‐1.45   Climate Zones 4 including

Marine – 8: U-‐0.50

502.4.7 Mandatory Requirements – Ves3bules now in ASHRAE

ASHRAE allows climate Zone 1, 2, and 3 exemptions to Vestibules

IECC allows climate Zone 1 and 2 exemptions

Loading Dock Weatherseals

ASHRAE 90.1-2007 IECC 2009

Required in Climate Zones 4 – 8 only.

Required if space is conditioned.

Result: In some cases, the allowable damper leakage rate in ASHRAE are higher than those in the IECC. Thus, in some cases, IECC is more stringent.

Allowable maximum U-‐factor

ASHRAE 90.1-2007 IECC 2009

Allows for an increase in the allowable maximum U-factor (reduction in required R-value) for certain roof/ceiling assemblies if the roof meets certain reflectance (high albedo) and emissivity requirements.

This allowance is not provided in the 2009 IECC.

Result: In climate zones 1-‐3, insula3on requirements may be less under ASHRAE 90.1-‐07.

ASHRAE Table 5.5.3.1


Commercial Mechanical Requirements

Shutoff Damper Controls

ASHRAE 90.1-2007 IECC 2009

Non-motorized dampers acceptable in Zones 1, 2 and 3.

Many more requirements.

Non-motorized dampers acceptable in buildings under 3 stories and for buildings of any height in Zones 1, 2, and 3.

HVAC equipment oversizing

ASHRAE 90.1-2007 IECC 2009

Does not limit HVAC equipment oversizing.

Limits HVAC equipment oversizing (Section 503.2.2). Heating and cooling equipment and systems shall not exceed the loads calculated in accordance with section 503.2.1 (references ASHRAE/ACCA Standard 183.)

Result: In some cases, the 2009 IECC would result in equipment that operates more efficiently on a seasonal basis.

Certain HVAC equipment and systems

ASHRAE 90.1-2007 IECC 2009

Tends to be more rigorous and, in some cases (e.g., fume hoods, cooling towers, dehumidification, and kitchen exhaust hoods), has requirements that are not in the IECC 2009.

Some of the HVAC equipment not listed in the IECC may be included in the IMC because it is a family of codes.

Result: The subtle differences between the two in this area could have an impact on the aggregate, in par3cular that ASHRAE requirements tend to be more rigorous.

Opera3ons & Maintenance Manuals

ASHRAE 90.1-2007 IECC 2009

Requires the delivery of Operation and Maintenance (O&M) manuals for the building systems. (Sections 6.7.2.2 and 8.7.2)

Requires that an operating and maintenance manual be provided to the building owner by the mechanical contractor. (Section 503.2.9.3)

Result: The requirements in ASHRAE are more detailed than IECC. For example, ASHRAE requires that rou3ne maintenance ac3ons shall be clearly iden3fied and requires the name and address of at least one qualified service agency.


Commercial Ligh3ng Requirements

Space-‐by-‐Space method to LPD limits

ASHRAE 90.1-2007 IECC 2009

Contains a Space-by-Space method as an alternative to the by-building-type prescriptive tables for lighting power limits (Section 9.6.1 and Table 9.6.1)

The interior lighting power is the floor area for each building area type listed in Table 505.5.2 times the value from Table 505.5.2 for that area. Each building area shall be treated as a separate area.

Result: A building complying via the Space-‐by-‐Space method may be subject to more or less rigorous requirements depending on the specifics of space types contained within the building.

Ligh3ng controls

ASHRAE 90.1-2007 IECC 2009

ASHRAE requires automatic lighting shutoff and has similar requirements for overriding automatic shutoff (e.g. 2 hours vs. 4 hours) and for sleeping unit controls as IECC.

IECC also has requirements for light reduction controls, holiday scheduling and daylight zone control that are not included in ASHRAE.

Result: IECC has somewhat more detailed and rigorous ligh3ng control requirements, in par3cular IECC has a sec3on on daylight zone control.

Interior retail ligh3ng allowances

ASHRAE 90.1-2007 IECC 2009

(Retail Area 1 x 1.0 W/ft2) (Retail Area 2 x 1.7 W/ft2) (Retail Area 3 x 2.6 W/ft2) (Retail Area 4 x 4.2 W/ft2)

(Retail Area 1 x 0.6 W/ft2) (Retail Area 2 x 0.6 W/ft2) (Retail Area 3 x 1.4 W/ft2) (Retail Area 4 x 2.5 W/ft2)

Result: ASHRAE has higher addi3onal retail ligh3ng allowances, i.e. IECC is more stringent.

Exterior ligh3ng power densi3es

ASHRAE 90.1-2007 IECC 2009

Table 9.4.5 lists LPDs for tradable vs. nontradable surfaces, but lighting zones are not designated.

Table 505.6.2(1) lists lighting zones and Table 505.6.2(2) lists LPDs for each of 4 lighting zones and for tradable and nontradable surfaces.

Result: In general, some of the exterior LPDs in IECC are lower (more restric3ve), but it varies by ligh3ng zone.


Ques3ons & Answers

Thank You for AJending!

Your Instructors: Ken Baker -‐ K energy Sharon PaJerson -‐ Eco Edge

2009 IECC VS ASHRAE 90.1 MASTER 121410

Documents

Transcript of 2009 IECC VS ASHRAE 90.1 MASTER 121410