Presentation on theme: "Major Changes to the 2009 IECC"— Presentation transcript:
1Major Changes to the 2009 IECC &Above Code Programs
2Energy Engineer and Consultant IntroductionTim Guiterman, LEED APEnergy Engineer and ConsultantNavigant ConsultingBurlington, VT(802)
3Overview Objective Administration Building Envelope Mechanical Systems Electrical Power & LightingQ&AAbove Code Programs
4ObjectiveHighlight the major changes between 2006 and 2009 IECC that will affect your upcoming projects in New Hampshire.Source for Changes to 2006 IECC:
5Suggested Reading Combined 2009 IECC/ASHRAE 90.1-2007 2009 IECC Commentary2009 IECC Study CompanionAvailable combined with codeASHRAE 90.1 User’s ManualDid you get the free downloads?
6Introduction to the Commercial Energy Code Compliance Process Must the Project Comply with the IECC?Comply with the Envelope RequirementsComply with the Mechanical/SWH RequirementsComply with thePower & Lighting RequirementsSection 50290.1 Section 5Sections 503 and 50490.1 Section 6Section 50590.1 Section 9Document Compliance with the IECCPlan ReviewInspection
8Major Changes to Chapter 1 Adds exemptions to Additions, Alterations, Renovations and Repairs sectionChange in Occupancy section revisedChange in Space Conditioning requires full compliance with code
9101.4.3 Additions, Alterations, Renovations and Repairs Working on an existing building? If you touch it, bring it up to code… Additions, alterations, renovations or repairs to an existing building, building system or portion thereof shall conform to the provisions of this code… without requiring the unaltered portion(s) of the existing building or building system to comply with this code. With some exceptions…
10101.4.3 Additions, Alterations, Renovations and Repairs New Exceptions:If you replace an existing door, separating conditioned space from exterior, you do not need to add a vestibule; however, if a vestibule is part of the door assembly that is modified, it must remain on the building or be replacedUp to 50% of the luminaires can be replaced as long as the load is not increased in the buildingBulb & ballast replacements are exempt providing the alteration does not increase the load.
11Change in Occupancy2006 IECC required buildings undergoing a change in occupancy that results in increased load to comply with the code2009 IECC maintains above (“space” in lieu of “building”) and requires installed lighting wattage to comply with IECC if the space changes from one use to another use as defined in Table
12Full compliance with the code for that space Scenario: An online retail company based in Manchester is converting 5,000 SF of open office space to warehouse space. All of the lighting will be changed. The IECC requires:Full compliance with the code for that spaceCompliance with only the lighting power allowance for that spaceThe space is exempted from the code#2 Correct
13Change in OccupancyFull compliance is not necessary, as this is not an addition, alteration, renovation or repair to the building.It’s not fully exempt as more than 50% of the lighting is being replacedThis is classified as a change in occupancy (Section ), and demand for energy is not increasing. The space is changing form one us eto another in Table so LPD must change form 1.0 to 0.8 W/SF.
15What are My Options for Complying with the IECC? Chapter 5 of the IECC General Prescriptive ApproachUse for ≤ 40% of gross wall area in vertical fenestrationUse for ≤ 3% of gross roof area in skylightsSection 506 Total Building Performance ApproachASHRAE/IESNA Standard2006 IECC allowed individual sections to comply with either IECC or ASHRAE 90.12009 IECC requires compliance with either IECC or ASHRAE 90.1 in its entiretyNote: Code now references ASHRAE
17Commercial Envelope Compliance Process Must the Project Comply with the IECC?Comply with the Envelope RequirementsComply with the Mechanical/SWH RequirementsComply with the Lighting RequirementsSection 50290.1 Section 5Sections 503 and 50490.1 Section 6Section 50590.1 Section 9Document Compliance with the IECCPlan ReviewInspection
18Major Changes to Envelope Requirements Added U-factor table to correspond to R-Value tableAdded Group R category for insulationEnvelope stringency increasedAdditional descriptions added for metal building walls/roofsConsolidated skylight categories into one category
20Table 502.1.2: Envelope Requirements (Cont’d) Category2006 IECC2009 IECCCZ 5CZ6Walls-Below GradeBelow Grade WallNRR-7.5ciFloorsMassR-10ciR-12.5ciJoist/FramingR-19R-30Slab-On-Grade FloorsUnheated SlabsR-10 for 24 in. belowHeated SlabsR-7.5 for 24 in. belowR-10 for 36 in. belowR-15 for 24 in. belowOpaque DoorsSwingingU-0.70Roll-up or SlidingU-1.45U-0.50
21Heat transfer is greater in metal than in wood In CZ 5 and below, more insulation is required for metal-framed walls than for wood-framed walls. Why?Heat transfer is greater in metal than in woodMetal-framed walls are spaced closer so there is more thermal-bridgingHeavy lobbying by the wood industry to drive up costs for metal-framing#1 is correct
22Below-grade walls are defined as exterior walls that are… At least 50 percent below gradeAt least 85 percent below gradeThe below grade portion of a basementAny exterior wall not classified as above grade#2 Correct
23Slab-on-Grade Floors (502.2.6) Unheated slab – insulation required in NHCZ 5: Only required for Group RCZ 6: R-10 for 24 inches belowHeated slabs – insulation requiredCZ 5 & 6: R-15 for 24 inches belowWhat are you seeing in practice?2006 IECC didn’t require insulation in Climate Zones 1-7 for unheated slabsQuestion for attendees: What are we seeing in practice? How is insulation applied? Code requires downward and then horizontal. Is this followed? Is insulation typically exterior or interior?: The insulation shall be placed on the outside of the foundation or on the inside of a foundation wall. The insulation shall extend downward from the top of the slab for a minimum distance as shown in the table or to the top of the footing, whichever is less, or downward to at least the bottom of the slab and then horizontally to the interior or exterior for the total distance shown in the table.
24Roof R-Value – Insulation Placed on Suspended Ceiling with Removable Ceiling Tiles Will not count for code complianceWill not comply with Section – “Sealing of the building envelope”
25Roof R-Value – Metal Buildings R-5 thermal blocks required on all metal buildings or must use U-factor Compliance MethodRequire two layers of insulationCZ 5: R-13+R-13CZ 6: R-13+R-19Example (R-13+R-19):R-13 draped perpendicularly to the purlinsR-19 running parallel to the purlins supported by the R-13
26Vertical Fenestration Requirement (502.3.1) - Prescriptive Percentage of Vertical Fenestration Area to Gross Wall AreaAllows up to 40% maximum of above grade wallQuestion: What are typical fenestration percentages you see?
27IECC Section 506 (Total Building Performance) only A commercial building in North Conway, NH will have a gross wall area of 15,000 ft2. The building will have a vertical fenestration area of 7,500 ft2. What building envelope compliance options are available for this project?ASHRAE onlyIECC Section 506 (Total Building Performance) onlyIECC Section 502 (Building Envelope Requirements) and Section 506 (Total Building Performance)1 and 2 only#4 Correct
28Vertical Fenestration Requirement (502.3.1) Based on above-grade wall area (gross)Includes walls between conditioned space and unconditioned space or the outdoorsIncludes walls that are > 15% above gradeTotal fenestration area (includes frame and glazing)Does not include opaque door area
29Glazed Fenestration SHGC (502.3.2) What is Solar Heat Gain Coefficient?“The ratio of the solar heat gain entering the space through the fenestration assembly to the incident solar radiation.”
30Fenestration SHGC Requirements The Effect of Overhangs on Fenestration SHGCOverhangs allow a higher SHGC product to be installedProjection factor must be calculated
31Skylight U-Factor / SHGC 2006 IECC classified glass and plastic skylights2009 IECC condensed into one categoryLimited to ≤ 3% of Roof AreaU-factor and SHGC BasedNFRC 100 Rating for U-factor or Default TableCategory2006 IECC2009 IECCCZ 5CZ6SkylightsU-factorGlass: 0.60 Plastic: 1.30Glass: 0.90 Plastic: 1.300.60SHGCGlass: 0.40 Plastic: 0.620.40
32Mandatory Requirements – Sealing of the Building Envelope (502.4.3) All penetrations, openings, joints and seams in the building envelope must be sealed. Materials that can be used include:CaulkingGasketingTapesMoisture vapor-permeable wrapping materialSealing materials spanning joints between dissimilar materials must allow for expansion and contraction
34Mechanical Systems Compliance Process Must the Project Comply with the IECC?Comply with the Envelope RequirementsComply with the Mechanical/SWH RequirementsComply with the Lighting RequirementsSection 50290.1 Section 5Sections 503 and 50490.1 Section 6Section 50590.1 Section 9Document Compliance with the IECCPlan ReviewInspection
35Major Changes to Mechanical Requirements Revises equipment efficiency tables for water-chilling packagesRequires snow melt controlRequires demand control ventilation (DCV) for certain spacesRemoves exception for energy recovery ventilation for lab fume hood systems ≤ 15,000 cfmLowers the system capacity for economizer requirement for NH climate zones 5A and 6AIntroduces fan power limitationsReorganizes hydronic water loop heat pump sectionIntroduces supply air temperature reset controls for multiple-zone systems
36Section 503 Building Mechanical Systems Simplified to Include Only Four Sections:What Provisions of the Code Apply (503.1)Mandatory Provisions (503.2)Simple HVAC Systems and Equipment (503.3)Complex HVAC Systems and Equipment (503.4)
37Simple Versus Complex Systems Buildings served by unitary or packaged HVAC each serving 1 zone controlled by 1 thermostat. Two-pipe heating systems serving multiple zones are included if no cooling system is installed [Tables (1) through (5)]Section Simple SystemsSection Complex SystemsAll buildings served by HVAC systems not covered under 503.3
38Variable air volume system Unitary or packaged system A non-packaged HVAC system that is designed to serve multiple building zones would be referred to as a ______.Simple systemComplex systemVariable air volume systemUnitary or packaged system#2 Correct
40Equipment and System Sizing (503.2.2) Output capacity SHALL NOT exceed sizing –Select the system which serves the greater load, heating or coolingExceptionsStandby Equipment with Required ControlsMultiple Units with Combined Capacities Exceeding LoadsSequencing Controls Required
41Multiple boilers-allowed to exceed load- if sequenced Multiple units of the same equipment type with combined capacities exceeding the design load and provided withcontrols that have the capability to sequence the operation of each unit based on load.
42Table (2)This is only part of Table (2) to give an idea of the information contained in the table. Values before and after January 2010
43According to Chapter 5, simple HVAC systems and equipment that meet the minimum equipment requirements listed in Tables (1-11) shall be verified…By an approved certification program, or if none exists, with manufacturer’s dataBy the building officialThrough testing procedures found in the ASHRAE Handbook of FundamentalsBy an onsite contractor at the time of equipment inspection#1 Correct
44The automatic controls for a snow-melt system shall be capable of shutting off the system when the pavement temperature is above _____ and no precipitation is falling.35°F45°F40°F50°F#4 is correct
45Demand Controlled Ventilation (503.2.5.1) 2006 IECC had no DCV requirement2009 IECC: DCV must be provided for each zone with spaces > 500 ft² and the average occupant load > 40 people/1000 ft² of floor area where the HVAC system has:An air-side economizerAutomatic modulating control of the outdoor air damper, orA design outdoor airflow > 3,000 cfmDemand control ventilation (DCV): a ventilation system capability that provides for the automatic reduction of outdoor air intake below design rates when the actual occupancy of spaces served by the system is less than design occupancy.Changed from 2006 IECC.
46Demand Controlled Ventilation (503.2.5.1) - Exceptions Systems with energy recovery perMultiple zone systems without direct digital control of single zones communicating with central control panelSystems with design outdoor airflow < 1,200 cfmSpaces where supply airflow rate minus any makeup or outgoing transfer air requirement < 1,200 cfmQuestion about spaces with ~2,000 cfm?
47Demand Controlled Ventilation (503.2.5.1) The wall and duct-mounted carbon dioxide (CO2) sensors are designed especially for demand-controlled ventilation zone applications.Question about spaces with ~2,000 cfm?
48Demand Controlled Ventilation (503.2.5.1) Question about spaces with ~2,000 cfm?
49Demand Controlled Ventilation (503.2.5.1) Question about spaces with ~2,000 cfm?
50Energy Recovery Ventilation (503.2.6) 2006 IECC: Exception for lab fume hood systems ≤ 15,000 cfm2009 IECC: Removed only this exception, maintained all othersSignificant change from 2006 IECC
51ECONOMIZER REQUIREMENT Economizers ( )2006 IECC: CZ 5A and 6A - Economizers required on all systems ≥ 135,000 Btu/h2009 IECC: Revised to 54,000 Btu/hTable (1)CLIMATE ZONESECONOMIZER REQUIREMENT1A, 1B, 2A, 7, 8No requirement2B, 3A, 3B, 3C, 4A, 4B, 4C, 5A, 5B, 5C, 6A, 6BEconomizers on cooling systems ≥ 54,000 Btu/haa The total capacity of all systems without economizers shall not exceed 480,000 Btu/h per building, or 20 percent of its air economizer capacity, whichever is greater*Note: CZs 2B, 3B and 4B can trade off economizer requirement with improved equipment efficiency (10-20%)
52Yes, the system is greater than 90,000 Btu/h A cooling system rated at 135,000 Btu/h capacity is proposed for an office building in Portland (CZ 5A). The proposed EER for the system will be Is an economizer required for this system?Yes, the system is greater than 90,000 Btu/hNo, the system meets the 10.9 EER requirement for tading-offYes, economizers cannot be traded off in CZ 5No, there is no economizer requirement in CZ5.#3 Correct
53Supply and return ducts and plenums are required to be insulated to… R-8 in all locationsR-5 in all locationsR-5 in unconditioned spaces; R-8 exteriorR-8 in unconditioned spaces; R-5 exteriorNone of the above
54Air System Design and Control (503.2.10) 2006 IECC: No Requirement2009 IECC: HVAC systems with total fan system power > 5 hp to meet andAllowable Fan Floor HorsepowerMotor Nameplate HorsepowerFan system power is the sum of the nominal power demand (nameplate hp) of all fans in a system that are required to operate at design conditions to supply air from the heating or cooling source (such as coils) to the conditioned spaces and return it back to the source or exhaust it to the outdoors.Changed from the 2006 IECC.
55Allowable Fan Floor Horsepower Each HVAC system at fan design conditions to not exceed allowable fan system motor nameplate hp (Option 1) or fan system bhp (Options 2) in Table (1)ExceptionsHospital and laboratory systems using flow control devices on exhaust and/or return for health and safety or environmental control permitted to use variable fan power limitationIndividual exhaust fans ≤ 1 hpFans exhausting air from fume hoods
56Motor Nameplate Horsepower Selected fan motor to be no larger than first available motor size greater than bhpFan bhp on design documentsExceptionsFans < 6 bhp, where first available motor larger than bhp has nameplate rating within 50% of bhp, next larger nameplate motor size may be selectedFans ≥ 6 bhp, where first available motor larger than bhp has nameplate rating within 30% of bhp, next larger nameplate motor size may be selectedbhp = brake horsepower
57Hydronic Water Loop Heat Pump Systems (503.4.3.3) All of changed from the 2006 IECC.Question: Are these systems commonplace in NH new construction? What are impacts of new requirements?Temperature dead band of at least 20ºF ( )Exception: where system loop temp optimization controller is installed and can determine the most efficient operating temp based on real time conditions of demand and capacityAll of changed from the 2006 IECC.
58Hydronic Water Loop Heat Pump Systems (503.4.3.3) – cont’d Heat rejection equipmentOpen- or closed-circuit cooling tower usedMust have a separate heat exchanger to isolate cooling tower from heat pump loopHeat loss controlled by shutting down circulation pump on cooling tower loop and providing an automatic valve to stop flow of fluidTwo position valve ( )Required on each hydronic heat pump with total pump system power > 10 hp
59Supply-Air Temperature Reset Controls (503.4.5.4) 2006 IECC: No requirement2009 IECC: Multiple zone HVAC systems to have controls to automatically reset supply-air temperature in response to building loads or outdoor air temperatureControls to be capable of resetting supply air temperature at least 25% of difference between design supply-air temperature and design room air temperatureExceptionsSystems that prevent reheating, recooling or mixing of heated and cooled supply air75% of energy for reheating is from site-recovered or site solar energy sourcesZones with peak supply air quantities of ≤ 300 cfmSignificant change from 2006 IECC
60Section 505: Electrical Power and Lighting Systems
61The IECC Code Compliance Process Must the Project Comply with the IECC?Comply with the Envelope RequirementsComply with the Mechanical/SWH RequirementsComply with thePower & Lighting RequirementsSection 50290.1 Section 5Sections 503 and 50490.1 Section 6IECCSection 505Section 9Document Compliance with the IECCPlan ReviewInspectionSection 506Building PerformanceMethodLighting compliance can be shown in three different ways: IECC Section 505, 90.1 Section 9, or IECC Section Section 506 is a whole building performance method that involves the use of modeling software. It compares a building built just meeting the code requirements to your building. If the energy use of your building is less than the “base” building, your building complies.The performance method is typically used only for complex buildings or when the other compliance options do not work.
62Major Changes to Electrical/Lighting Systems Requirements Adds high-efficacy lighting requirement for dwelling unitsRequires separate controls for daylight zonesAllows for use of photocell in tandem with other controls on certain exterior lighting applicationsAdds exempted lighting applications that can be excluded from total connected interior lighting power calculationsRevises additional lighting power allowance calculations for retail areasCreates four exterior lighting zones based on lighting need
63When do the Lighting and Power Requirements Apply? Original installed lighting system in a new building, addition, or tenant build-outExisting lighting system that is alteredChange in occupancy that increases energyExceptions:Historic buildingsState or National listingEligible to be listedAlterations where less than 50% of the luminaires are replaced and power is not increasedLighting within dwelling unitsWhere ≥ 50% of permanently installed fixtures are high-efficacy lampsThere are other historic listings that may be applicable, such as regional listings. Confirm these exceptions with the building official.
64High-Efficacy Lamps Defined in the 2009 IECC as: Compact fluorescent lamps, T-8 or smaller diameter linear fluorescent lamps, or lamps with a minimum efficacy based on lamp wattageLamp WattageEfficacy> 40 watts60 lumens/watt15-40 watts50 lumens/watt< 15 watts40 lumens/wattDefinition of high-efficacy added in 2009 IECC.
65What’s Covered Under Electrical Power and Lighting Systems Requirements? Mandatory Interior Lighting RequirementsRequired ControlsWattage/Efficiency LimitsInterior Lighting Power Allowances (watts/ft2)Exterior Lighting ControlsLamp EfficiencyExterior Lighting Power Allowances (watts/ft2)Electric Metering
66Interior Lighting Control (505.2): Basic Control Independent Lighting Control required for each space surrounded by floor-to-ceiling partitionsMust be located in the space served, or -Switched from a remote locationMust have indicator that identifies the lights served and their status (off or on)ExemptionsSecurity or emergency areas that must be continuously lightedLighting in stairways or corridors that are elements of the means of egressIntent: Allow occupants to control unneeded lighting!
67Interior Lighting Control: Light Reduction Light Reduction Controls must allow the occupant to reduce connected lightingBy at least 50%In a reasonably uniform illumination patternNote: Alternate Standard ASHRAE/IESNA does not require Light Reduction ControlIntent: Allow occupants to moderate light levels to save energy!
68Light Reduction Control Options Controlling all lamps or luminairesDual switching of alternate rows of luminaires, alternate luminaires or lampsSwitching middle lamp luminaires independently from the outer lampsEach luminaire or each lampDimmingAlternating LuminairesAlternating lampsDimmer SwitchDOptions are: dimming, dual switching in a uniform patter across the ceiling grid, or, for three-lamp fixtures, switch the middle lamps independently from the outer lamps. You can also do each luminaire or each lamp although this isn’t common due to cost and practicality.SS
69Interior Lighting Control: Light Reduction Exemptions Light Reduction Control Not required for the following:Areas with only one luminaireAreas controlled by occupancy sensorCorridors, storerooms, restrooms or public lobbiesSleeping unitsSpaces with <0.6 w/ft2A sleeping unit is different than a dwelling unit. A sleeping unit refers to the bedroom in a hotel/motel, boarding house, etc.
70Which of the following spaces must install light reduction controls? Hotel sleeping unitPublic lobby in an office buildingOffice space with two luminairesRestroom#3 Correct. All the other spaces are listed in the exemptions.
71Interior Lighting Control: Automatic Shutoff Automatic lighting shutoff control device required in all buildings larger than 5,000 ft2Building Defined:“Any structure used or intended for supporting or sheltering any use or occupancy”Building area surrounded by exterior walls and fire wallsExempted spacesSleeping unitsLighting for patient careWhen an automatic shutoff would endanger occupant safety or securityIntent: Eliminate after hours lighting waste!Two ways to define “building”. In the second, “fire walls” is the important distinction. For example, a strip mall with different units in it may be over 5000 sf, but if the individual units are separated by fire walls and are less than 5000 sf, automatic shutoff would not be required.Also, if there is a space such as a mechanical room in which equipment is maintained, automatic shutoff might endanger people working on or near the equipment and this space may therefore be exempted.
72Interior Lighting Control: Automatic Shutoff Options Automatic Lighting Shutoff Compliance OptionsControl lights on a scheduled basis (automatic time switch)Time-of-day controllerControls ≤ 25,000 ft2 and not more than one floor, orOccupant sensorTurn lights off within 30 minutes of occupant leaving the spaceSignal from another control or alarm that indicates the area is unoccupiedCourtesy Britt-Makela Group
73Interior Lighting Control: Automatic Shutoff Override Readily accessibleWithin view of the lights or area controlledManually operated≤ 2 hour overrideControls an area ≤ 5,000 ft2ExemptionsCan be over 2 hour override in malls and arcades, auditoriums, single-tenant retail space, industrial facilities and arenas when using captive key overrideOverride in malls and arcades, auditoriums, single-tenant retail space, industrial facilities and arenas can cover up to 20,000 ft2
74Automatic lighting shutoff is not required in buildings that are a maximum of ______ square feet. 10,0007,5005,0002,500#3 Correct
75Daylight Zone Definition – Under Skylights The area under skylights whose horizontal dimension, in each direction, is equal to the skylight dimension plus the smaller of:The floor-to-ceiling height, orThe distance to a ceiling height opaque partition, orOne-half the distance to adjacent skylights or windowsNew in the 2009 IECC.75
76Daylight Zone Definition – Adjacent to Vertical Fenestration The daylight zone depth is assumed to be 15 feet into the space or to the nearest ceiling height opaque partition, whichever is lessThe daylight zone width is assumed to be:the width of the window plus 2 feet on each side, orthe window width plus distance to opaque partitions, orthe window width plus one-half the distance to adjacent skylight or vertical fenestration, whichever is least.76
77Daylight Zone Control Daylight zones Must have individual control of the lights independent of general area lighting
78Interior Lighting Power Limits (505.5) Connected Interior Lighting Power must not exceed Interior Lighting Power AllowanceCalculate Interior Lighting Power AllowanceBuilding Area type allowanceAdditional allowancesCalculate proposed connected lighting powerWattage calculation “rules”Exempted lightingCompare values: proposed wattage must be less than or equal to allowed wattageIntent: Eliminate waste from sloppy lighting design and application!
79Interior Lighting Power Allowances TableBuilding Area TypeNote: Alternate Standard ASHRAE/IESNA provides whole building and space-by-space options
80Interior Lighting Power Allowance Calculation First, choose an appropriate “Building Area Type” from the allowance table ( ).“Building Area” includes all spaces that are associated with that business or function type. For example a space with:Corridors,Restrooms,A lobby, andOffice space…would be considered an Office Building Area TypeThen...multiply the lighting power density (W/ft2) by the building square footage to get allowed watts for compliance
81Office - ExampleTableA 200,000 ft2 office building that contains corridor, restrooms, break rooms and a lobby is given 1.0 W/ft2 for the entire buildingOffice: 200,000 ft21.0 W/ft2 = 200,000 W
82Interior Lighting Power Allowance for Multiple Occupancy Building How is an allowance determined if the building has more than one Building Area Type?Example – A building contains the following area typesMuseum: 40,000 ft2Retail: 5,000 ft2Cafeteria: 10,000 ft2Use the more specific building area type where more than one area type exists in the buildingSum the individual (lighting power density X area square footage) values for Total Power Allowance
83Multiple Occupancy Building - Example TableMuseum: 40,000 ft2at 1.1 W/ft2 = 44,000 WCafeteria:10,000 ft2at 1.4 W/ft2 = 14,000 WRetail: 5,000 ft2at 1.5 W/ft2 = 7,500 WTotal watts allowed = 65,500 WIn this example, add the individual allowances to arrive at the total allowed watts.
84Additional Retail Lighting Power Allowance (Table 505.5.2 – Footnotes) Additional Interior Lighting Power Allowance = 1000 watts +(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),Where:Retail Area 1 = the floor area for all products not listed in Retail Area 2, 3 or 4.Retail Area 2 = the floor area used for the sale of vehicles, sporting goods and small electronics.Retail Area 3 = the floor area used for the sale of furniture, clothing, cosmetics and artwork.Retail Area 4 = the floor area used for the sale of jewelry, crystal, and china.Exception: Other merchandise categories may be included in Retail Areas 2 through 4 above, provided that justification documenting the need for additional lighting power based on visual inspection, contrast, or other critical display is approved by the authority having jurisdiction.Intent: Allow flexibility in design for critical retail applications!Specific accommodation has been made for retail merchandise highlighting in the 2009 IECC. These are IN ADDITION TO general lighting.Display area is the specific area to highlight merchandise. For example, track lighting installed to highlight a wall display of shoes – would qualify. Overhead, general lighting not specifically aimed at the wall of shoes would not qualify.
85Proposed Lighting Power Calculation Sum the wattage of all proposed connected lighting powerThis must include all lighting that is part of the design for the space including:Overhead lightingTask lightingDecorative lightingMust include all lighting that is part of the design. If individual task lighting is part of the design it must be included. One example of lighting that would NOT have to be included is if the tenant purchases furniture with under shelf task lighting that wasn’t part of the original design.The calculation includes the lamp plus ballast values.Note: Wattage must be calculated based on actual power draw…not just nominal lamp rating
86Wattage of the light bulb proposed for the fixture When documenting the total connected lighting power for a proposed building, what wattage should be used for a screw lamp holder?Wattage of the light bulb proposed for the fixtureMaximum labeled wattage of the luminaire300 watts per fixture100 watts per fixture#2 Correct
87Exemptions to Proposed Lighting Power Calculation Connected power for following not included in calculations:Professional sports arena playing fieldSleeping unit lightingEmergency lighting automatically off during normal building operationLighting in spaces specifically designed for use by occupants with special lighting needs including visual impairment and other medical and age related issuesLighting in interior spaces specifically designated as a registered interior historic landmarkCasino gaming areasLighting equipment used for the following exempt if in addition to general lighting and controlled by an independent control deviceTask lighting for medical and dental proceduresDisplay lighting for exhibits in galleries, museums and monumentsTheatrical, stage, film, and video productionUsed for photographic processesIntegral to equipment or instrumentation installed by manufacturerPlant growth or maintenanceAdvertising or directional signageFood warming and food prep equipment (in restaurant buildings and areas)Lighting equipment that is for saleLighting demonstration equipment in lighting education facilitiesApproved because of safety or emergency considerations, exclusive of exit lightsIntegral to both open and glass-enclosed refrigerator and freezer casesIn retail display windows when the display is enclosed by ceiling-height partitionsFurniture-mounted supplemental task lighting controlled by automatic shutoffThese types of lighting do not have to be counted. These are considered to be IN ADDITION TO general lighting.
88What if My Proposed Design Does Not Meet Code? Check calculationsAppropriate area type allowances used?Actual lighting equipment wattages used?…and designReasonable illuminance levels provided?Efficient light sources used?Use alternate Standard *Use total Building Performance Method*Section Application requires 90.1 to be used in its entirety (Envelope, Lighting, Mechanical) if used as an alternate compliance pathIf using default values, you might want to use the actual values.does have space-by-space option available, but the numbers (in terms of stringency) are the same for the same types.Building Performance Method – typically for larger, more complex buildings.
89Exterior Lighting Control Requirements (505.2.4) For dusk-to-dawn lighting: astronomical time switch or photosensorFor all other: astronomical time switch OR photosensor + time switchAll time switches must have 10 hour battery backup
90Exterior Efficiency Requirement (505.6.1) Building grounds lighting luminaires over 100 watts must have source efficacy of at least 60 lumens per wattExceptions:Controlled by motion sensorAny of the exterior lighting power allowance exceptionsAs approved for a historical, safety, signage, or emergency considerationAs the table shows, incandescent and halogen lighting is not efficient enough; some CFL and linear fluorescents will work.If claiming an exception, document if for the building official.
91Exterior Lighting Power Limits (505.6.2) Connected Exterior Lighting Power must not exceed Exterior Lighting Power AllowanceCalculate exterior Lighting Power AllowanceLighting power densities by exterior function and by applicable lighting zoneCalculate proposed connected lighting powerWattage calculation “rules”Exempted lightingCompare values: proposed wattage must be less than or equal to allowed wattageSimilar to interior lighting power limits.Same steps to calculate as for interior.
92Exterior Lighting Power Limits (505.6.2) What areas are covered under exterior lighting allowances?Tradable surfacesCommon exterior lighted needs that can be traded for other needs.For example, wattage allowed for parking lot lighting can be “traded” and used for canopy lighting.Nontradable surfacesLess common exterior lighted needs that cannot be traded for other needs.These applications have more specific security or task illuminance needs.Two sections to the table: tradable and non-tradable.Tradable – when calculating the allowance based on all surfaces; can be used for any fixture you want. Typically, the most common surfaces are included as tradable (example: parking lot lighting). If you don’t use it all, you can use it elsewhere (example: canopy lighting).Non-tradable – typically related to specific security requirements. “Extra” cannot be used for other fixtures.
93Tradable Surfaces Uncovered parking lots and areas Walkways (under and over 10 feet wide)StairwaysPedestrian tunnelsMain building entrancesOther doorsEntry canopiesFree-standing and attached sales canopiesOpen sales areasStreet frontage sales areas
94Nontradable Surfaces Building facades Automated teller machines and night depositoriesEntrances and gatehouse inspection stations at guarded facilitiesLoading areas for law enforcement, fire, ambulance and other emergency vehiclesDrive-up windows/doorsParking near 24-hour retail entrancesAlthough building facades are common, they are included as non-tradable surfaces. Cannot use “extra” wattage elsewhere.
95Exterior Lighting Zones [Table 505.6.2(1)] Description1Developed areas of national parks, state parks, forest land, and rural areas2Areas predominantly consisting of residential zoning, neighborhood business districts, light industrial with limited nighttime use and residential mixed use areas3All other areas4High-activity commercial districts in major metropolitan areas as designated by the local land use planning authorityNew in the 2009 IECC.
96Exterior Lighting Zones Zone 1Zone 2Zone 3Zone 4Base Site Allowance500 W600 W750 W1300 WTradable SurfacesUncovered Parking AreasParking areas and drives0.04 W/ft20.06 W/ft20.10 W/ft20.13 W/ft2Building GroundsWalkways less than 10 feet wide0.7 W/linear foot0.8 W/linear foot1.0 W/linear footWalkways 10 feet wide or greater0.14 W/ft20.16 W/ft20.2 W/ft2Plaza areasSpecial Feature AreasStairways0.75 W/ft21.0 W/ft2Pedestrian Tunnels0.15 W/ft20.3 W/ft2Requirements are by Zones in the 2009 IECC.
99Above Code ProgramsThe field is advancing…quickly
100Above Code Programs Green Building Codes Stretch CodesGreen Building Rating SystemsGreen Building CodesNet Zero/Living BuildingsGenerally, the arena of “beyond code” ranges form performance improvements over existing codes, to green, high performance building certification programs, to codified green building programs to net zero/living building goals.Baseline: ASHRAE or 2009 IECC (New Hampshire Amendments)
101Above Code Programs Why go beyond code? Owner-driven Save energyMarketingInternal goalsJurisdictional requirementDesigner-driven
102What percent of projects that you work on exceed the energy code (best guess)? Less than 25%25% - 50%50%-75%75% +Don’t Know!
103New Buildings Institute (NBI) Core Performance Program Buildings < 70,000 ft220% - 30% Savings over ASHRAECodified in Massachusetts “Stretch Code”Prescriptive path for LEED Energy & Atmosphere points (Eac1)No energy modeling required
104NBI Core Performance Program Design Process StrategiesIntegrated DesignCore Performance RequirementsDelivers consistent savings across building types, climatesEnhanced Performance StrategiesOptional measures certain systems or building typesEnergy ModelingOptional to pursue aggressive energy savings or show alternative compliance to prescriptive pathFour major sections of Core PerformanceFirst two requiredEnergy modeling can be used to achieve core performance requirements with more flexibility or to achieve more aggressive energy savings
105Green Building Rating Systems USGBC LEED / CHPS / Green GlobesThird party certification programsBaseline energy code: ASHRAEEnergy savings only one focus areaSustainable SitesWater EfficiencyMaterials & ResourcesIndoor Environmental QualityInnovation & DesignCollaborative for High Performance Schools (CHPS):K-12 schools; Northeast-specific
106Have you worked on a project that received a green building certification? YesNoMaybe
107Are you currently working on a project that is aiming to receive certification? YesNoMaybe
108Which rating system (s) have your projects utilized? USGBC LEED (NC, EB, CI, etc)NE-CHPSGreen GlobesAll of the aboveAt least two of the above
109Are you a LEED-Accredited Professional (AP) or LEED “Green Associate”? YesNo
110Green Building Rating Systems Minimum Energy Performance:
112ASHRAE Standard 189.1ANSI standard being developed in model code languageProvides minimum requirements for high-performance, green buildingsApplies to all buildings except low-rise residential buildings (same as ASHRAE/IESNA Std 90.1)Optional Compliance Path to the International Green Construction Code (IgCC)Not a design guide, not a rating systemSource: Introduction to Standard
113ASHRAE Standard 189.1 Topic Areas Sustainable Sites Water Use EfficiencyEnergy EfficiencyIndoor Environmental QualityBuilding’s Impact on the Atmosphere, Materials & ResourcesConstruction and Operations PlansWEEEIEQMRCOSource: Introduction to Standard
114International Green Construction Code High performance, green building codeConsistent with I-CodesAllows ASHRAE to be a compliance optionEnergy performance: 30% IECCExpected full release in early 2012Source: Introduction to Standard
115Living Building Challenge No credits, just prerequisitesRequires Net Zero Energy
116Above Code ResourcesDOE Stretch Code Programs:NBI:DOE Net Zero Energy Commercial Building Initiative:www1.eere.energy.gov/buildings/commercial_initiative/USGBC LEED:NE-CHPS:Green Globes:ASHRAE 189.1:IGCC: