Benefits of RI, RB and IRCC 0508 - Copy

7/27/2019 Benefits of RI, RB and IRCC 0508 - Copy

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2008 Copyright Reflective Insulation Manufacturers Association International

The

Reflective Insulation ManufacturersAssociation International


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Benefits of ReflectiveInsulation, Radiant

Barriers and IRCCs

Presented on Behalf of

RIMA International


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Learning Objectives

Identify what reflective products areavailable, how they work and are installed

Review thermal performance in a buildingenvelope

Discuss Energy Code compliance, EnergyStar compliance and Federal Energy Taxcredits as they apply to reflective products

Understand how radiant barriers affect theHERS index

Examine green building attributes (LEED andNAHB Model Green Guidelines)


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RIMA-I MembersPlatinum

Members Astro-

Foil/InnovativeEnergy

Covertech

KdB Isolation SA RoyOMartin

Reflectix Inc

TVM BuildingProducts

Advanced Technology

Air-Cell Innovations Pty LtdAstro Reflective Insulation AS

Celplast Metallized Products

Cleveland Laminating Corp

Compac Corporation

Dunmore CorporationDuPont Tyvek

ESP/Low-E

Fi-Foil Company

Foil Barrier Insulation

Heartland Insulation SupplyIdeal Tape Company Inc

Innovative Energy, California

Innovative Insulation Inc.

Insulation Solutions, Inc.

Isolant S.A.LIT Works Co.

Louisiana Pacific

Midwest Low-EMWI Components

Polyair

Polyon Barkai Ind.

Prodex

PT Insfoil PradanasaktiRadiant Barrier Specialists

Radiant Guard

Resisto, a Div. of Soprema

STS Coatings

San Miguel Woven ProductSigma Technologies Intl

Solec

Valeron Strength Films

Venture Tape Corp


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Overview

Definitions & Standards

Types and Applications

Insulation & Building Science

Codes, National Accrediation,GreenQ&A


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Types of Products

Reflective Insulation

Radiant Barriers

Low-e Spray Coatings


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Definitions Reflective Insulation: one or more low

emittance materials (0.10 or less) installedadjacent to air spaces in an enclosed air space.

The low emittance surfaces reduce radiationacross the air space. The layer(s) reducesradiant heat and convective heat transfer

Reference Documents for Reflective

Insulation: ASTM C1224 - Standard Specification

ASTM C727 - Installation


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Examples of Reflective Insulation Applications

R-Values apply

Floor or Crawl Space

Enclosed Cavity

Commercial Ceiling

Metal Furring & Drywall

(not pictured) Creates

Enclosed Cavity

Masonry

Walls

Metal

Buildings


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Definitions Radiant Barriers: one or more low emittance

materials (0.10 or less) installed adjacent tolarge open air spaces. The primary function of

the low emittance surface(s) is to reduceradiation across the air space.

Reference Documents for ReflectiveInsulation:

ASTM C1313 - Standard Specification

ASTM C1158 - Installation


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Examples of Radiant Barrier Applications

Draped Method

Bottom of Roof

Rafter - Method

Deck Applied Method


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Low-Emittance

Products


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Definition of an IRCC

An Interior Radiation Control Coating is a non-thickness dependent, low emittance coating. Whenapplied to non-porousbuilding materialssuch as plywood,

OSB, metal sidingor plasterboard,according to themanufacturersInstallation

instruction,it lowers the normalsurface emittance ofthese materials to

0.24 or lower.


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An IRCC System

A building constructionconsisting of a low-emittance surface boundedby an open air space. AnIRCC is used for the sole

purpose of limiting heattransfer by radiation and isnot specifically intended toreduce heat transfer byconvection or conduction. (ASTM C 1321, section 3.2.3)

Thus, an IRCCS is similar to a Radiant Barrier System(RBS) but is somewhat less efficient due to its higheremissivity and is comprised of a coating on a buildingsurface, not a foil or film product.

IRCCS Spray-applied to underside of steel roof decking

and trusses in an ice hockey arena.


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Advantages of an IRCC

An IRCC is normally applied using airlessspray equipment, resulting in very low laborcosts and greatly reduced installation times.

Also, a water based IRCC can be safelyinstalled in existing structures where thecosts of installing foil or film products maybe prohibitive or impractical. An IRCC may

also be used in many manufacturedproducts (such as infrared heat reflectors ofautomotive parts) where it is impractical toadhere foil or film radiant barriers.


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Building Science


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Reflective Insulation

RI: An enclosed air space with a low-

emittance surface.

Radiation is suppressed

MI: An enclosed air space filled with

solid fibers.Convection is suppressed


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Radiation is Suppressed by aLow-emittance Surface

Key Words: emittance, reflectance

Opaque materials zero transmission

Reflectance: fraction n incident radiation that

is not absorbed.

Emittance: (actual rad.)/(blackbody rad.)

A blackbody absorbs all incident radiation.

approximated by carbon black


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Emissive Power (Radiation)

All surfaces above absolute temperaturegive off radiation.

Expressions for Heat Flux (Btu/ft2hr)

0.1713x10-8( T + 460 )4 for blackbody

E( 0.1713x10-8( T + 460 )4 ) for real surface

F12E( 0.1713x10-8(( T1 + 460 )

4- (( T2 + 460 )4

for net exchange


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Radiation from a Surface Increases as theTemperature of the Surfaces Increases

Total Emissive Power of a Blackbody

Surface

25

75

125

175

225

275

0 25 50 75 100 125 150 175

Temperature (F)

E

missivePower

(Btu/ft^2.h

)


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Net Exchange Between Large ParallelSurfaces


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Net Exchange between LargeParallel Surfaces

The Net Exchange for this arrangement

of surfaces is given by:

F12 = 1/( 1/e1 + 1/e2 1)e1 e2 F12

1.00 1.00 1.00

0.87 0.87 0.77

0.87 0.22 0.21 73%

0.87 0.03 0.03 96%


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Diagram from ASTM C 1340 AtticRadiation Terms Radiant Barrier Theory


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Results in the Attic

Attic Radiant Barrier Winter

1. Reduces radiation heat transfer from thesurface of the attic floor insulation to the roofdeck.

2. Increases the surface temperature of theattic floor insulation.

3. Reduces the temperature difference from

bottom of the insulation to top of theinsulation.

4. Reduces the heat flow out of the conditionedspace.

5. Solar gain will be reduced.


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Side View of Wall

Exterior l l Interior Enclosed Air Space100 F l l 70 F Large Parallel Surfaces

l l 3.5 Inches Across

l lHeat Flux

Total Cond Conv Rad E warm E cold

35.84 1.54 8.66 25.64 0.87 0.87

11.17 1.54 8.63 1.00 0.87 0.03

10.68 1.54 8.63 0.54 0.03 0.03


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Reduce Convection by ChangingGap Size

Wall Cavity as Before

Description R (1-D) Conventional Units

wood-wood 0.84wood-foil 2.69

foil-foil 2.81

wood-foil-wood 6.73Wood-foil-foil-wood 12.41


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Hybrid System Consisting of Polyurethane and aReflective System in the Enclosed Air SpaceNominal 2x6 Frame Wall

Wall Cavity R vs. R* of Foam

(Reflective Insulation System)

5

7.5

10

12.5

15

17.5

20

3 4 5 6 7

R-per-inch of Foam

WallCavityR 0.5 in.

1.0 in.

1.5 in.

2.0 in.


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Summary Statements

RIS, RB, and IRCC utilize surfaces with lowemittance and high reflectance to reduce heatflow.

Reflective air spaces are well understood with R-

values that can be measured and calculated.

RB have demonstrated savings that result fromreduced radiation transport and cooler attic air

spaces.

Hybrid systems can be tailored to provideexcellent systems with demonstrated thermalcharacteristic.


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Green

LEED or NAHB Guidelines

Reduce Energy Use Primary

Benefit

Materials and Resources

Regional Materials


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Green Building;is the practice of increasing theefficiency with which buildings use resourcesenergy, water and materials while reducing buildingimpacts on human health and the environment,through better siting, design, construction, operation,

maintenance, and removal the complete buildingcycle.Wikipedia

The greatest benefits of radiant barriers and reflectiveinsulation used in Green Building are energyefficiency and comfort for a calculable return oninvestment through Energy Efficient Design andenergy modeling.

Green Building


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Qualifying for LEED Certification

Energy and Atmosphere;Optimize Energy PerformanceReflective Insulation can be used as an option to (or) in conjunction with other Insulationto add R-Value.

Radiant Barriers help reduce radiant heat transfer and improve the performance of roofand ceiling insulation.

Materials and Resources;Building Reuse, Maintain 50% of Interior non-structural elementsReflective Insulation and Radiant Barriers could be left in place as part of the existingwall, roof, floor or ceiling system.

Materials ReuseReflective Insulation and Radiant Barriers could be removed during demolition andreused in new construction.

Indoor Environmental Quality;Thermal Comfort: DesignReflective Insulation and Radiant Barriers can be used to improve building envelopesperformance and increase thermal comfort since they reduce radiant heat transfer.


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Qualifying for ENERGY STAR and NAHB

Reflective insulation and radiant barriers help you

qualify for the HERS Index Requirements

(Energy Star Qualified Homes)

Radiant barriers help you qualify for Renewable

energy/solar heating and cooling Using passive

Cooling

(NAHB Model Green Home Building Guidelines)


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Energy Star Compliance

R-values or

Credits in Software Programs

Impact Ceiling Heat Flow & HVACDucts and Systems located inunconditioned areas


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2. Energy Star Compliance

In order to be considered an Energy StarCompliant Home there must be a home energyrating which involves an analysis of the homes

construction plans and onsite inspectionresulting in a HERS Index score.

HERS Index of85 in climate zones 1-5

HERS Index of80 in climate zones 6-8

Reference IECC 2006 for Climate Zones


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U d t di th HERS


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Understanding the HERSRating

What is the HERS Index?

The HERS Index is a scoring systemestablished by the Residential Energy Services

Network (RESNET) in which a home built tothe specifications of the HERS ReferenceHome (based on the 2006 InternationalEnergy Conservation Code) scores a HERSIndex of 100, while a net zero energy home

scores a HERS Index of 0. The lower ahomes HERS Index, the more energy efficientit is in comparison to the HERS ReferenceHome.

U d t di th HERS


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Understanding the HERSRating

A home energy rating involves an analysis of a homesconstruction plans and onsite inspections. Based on thehomes plans, the Home Energy Rater uses an energyefficiency software package to perform an energyanalysis of the homes design. This analysis yields aprojected, pre-construction HERS Index. Uponcompletion of the plan review, the rater will work withthe bulder to identify the energy efficiency improvements

needed to ensure the house will meet ENERGY STARperformance guidelines. The rater then conducts onsiteinspection, typically including a blower door test (to testthe leakiness of the house) and a duct test (to test the

leakiness of the ducts).

Eff f R di B i


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Effect of Radiant Barrier onHERS Index Score

Radiant Barrier adds 3HERS Points to Energy Star

Compliance

Model

Attic

Floor

Walls A/C RB HERS

Charlotte R-30 R-13 Seer 14 None 85

R-30 R-13 Seer 14 Yes 82

Miami R-30 R-13 Seer 14 None 89

R-30 R-13 Seer 14 Yes 86

Las Vegas R-30 R-13 Seer 14 None 82

R-30 R-13 Seer 14 Yes 79


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Federal Tax Credits

Commercial Buildings: Taxpayers can enjoy a deduction ofup to $1.80 per square foot for buildings that achieve a 50%reduction in annual energy costs related to heating, cooling,water heating and interior lighting - costs that are defined bythe ASHRAE standard.

New Homes: A credit of up to $2,000 is available to homebuilders who build homes projected - and demonstrated - tosave at least 50% of the heating and cooling energy of acomparable home that meets the standards of the 2004International Energy Conservation Code (IECC) Supplement.

Existing Homes: Current homeowners are eligible fordifferent tax credits based on a variety of energy-efficiencymeasures - such as improving insulation - with a $500 cap.


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Questions?

Reflective InsulationManufacturers Association International

(RIMA International)

800/279-4123

www.rimainternational.org

Benefits of RI, RB and IRCC 0508 - Copy

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