Presentation on theme: "Major Changes to the 2009 IECC & Above Code Programs."— Presentation transcript:
Major Changes to the 2009 IECC & Above Code Programs
Introduction Tim Guiterman, LEED AP Energy Engineer and Consultant Navigant Consulting Burlington, VT (802) 526-5114 Tim.Guiterman@navigant.com 2
Overview Objective Administration Building Envelope Mechanical Systems Electrical Power & Lighting Q&A Above Code Programs
Objective Highlight the major changes between 2006 and 2009 IECC that will affect your upcoming projects in New Hampshire. Source for Changes to 2006 IECC: http://www.energycodes.info/Code%20Q%20and%20A_files/MAJOR%20CHANGES %20BETWEEN%20THE%202006%20AND%202009%20IECC.pdf http://www.energycodes.info/Code%20Q%20and%20A_files/MAJOR%20CHANGES %20BETWEEN%20THE%202006%20AND%202009%20IECC.pdf
Suggested Reading Combined 2009 IECC/ASHRAE 90.1-2007 2009 IECC Commentary 2009 IECC Study Companion – Available combined with code ASHRAE 90.1 Users Manual Did you get the free downloads?
Introduction to the Commercial Energy Code Compliance Process 6 Must the Project Comply with the IECC? Comply with the Envelope Requirements Comply with the Mechanical/SWH Requirements Comply with the Power & Lighting 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
Major Changes to Chapter 1 Adds exemptions to Additions, Alterations, Renovations and Repairs section Change in Occupancy section revised Change in Space Conditioning requires full compliance with code 8
101.4.3 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… 9
101.4.3 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 replaced – Up to 50% of the luminaires can be replaced as long as the load is not increased in the building – Bulb & ballast replacements are exempt providing the alteration does not increase the load. 10
101.4.4 Change in Occupancy – 2006 IECC required buildings undergoing a change in occupancy that results in increased load to comply with the code – 2009 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 505.5.2 11
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: 1.Full compliance with the code for that space 2.Compliance with only the lighting power allowance for that space 3.The space is exempted from the code
What are My Options for Complying with the IECC? Chapter 5 of the IECC General Prescriptive Approach Use for 40% of gross wall area in vertical fenestration Use for 3% of gross roof area in skylights Section 506 Total Building Performance Approach ASHRAE/IESNA Standard 90.1-2007 – 2006 IECC allowed individual sections to comply with either IECC or ASHRAE 90.1 – 2009 IECC requires compliance with either IECC or ASHRAE 90.1 in its entirety Note: Code now references ASHRAE 90.1-2007
Commercial Envelope Compliance Process 17 Must the Project Comply with the IECC? Comply with the Envelope Requirements Comply with the Mechanical/SWH Requirements Comply with the 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
Major Changes to Envelope Requirements Added U-factor table to correspond to R-Value table Added Group R category for insulation Envelope stringency increased Additional descriptions added for metal building walls/roofs Consolidated skylight categories into one category 18
Table 502.1.2: Envelope Requirements (Contd) 20 Category2006 IECC2009 IECC CZ 5CZ6CZ 5CZ6 Walls-Below Grade Below Grade WallNR R-7.5ci Floors MassR-10ci R-12.5ci Joist/FramingR-19R-30 Slab-On-Grade Floors Unheated SlabsNR R-10 for 24 in. below Heated Slabs R-7.5 for 24 in. below R-10 for 36 in. below R-15 for 24 in. below Opaque Doors SwingingU-0.70 Roll-up or SlidingU-1.45U-0.50
In CZ 5 and below, more insulation is required for metal-framed walls than for wood-framed walls. Why? 1.Heat transfer is greater in metal than in wood 2.Metal-framed walls are spaced closer so there is more thermal-bridging 3.Heavy lobbying by the wood industry to drive up costs for metal-framing
Below-grade walls are defined as exterior walls that are… 1.At least 50 percent below grade 2.At least 85 percent below grade 3.The below grade portion of a basement 4.Any exterior wall not classified as above grade
23 Slab-on-Grade Floors (502.2.6) Unheated slab – insulation required in NH CZ 5: Only required for Group R CZ 6: R-10 for 24 inches below Heated slabs – insulation required CZ 5 & 6: R-15 for 24 inches below What are you seeing in practice?
Roof R-Value – Insulation Placed on Suspended Ceiling with Removable Ceiling Tiles 24 Will not count for code compliance Will not comply with Section 502.4.3 – Sealing of the building envelope
Roof R-Value – Metal Buildings 25 R-5 thermal blocks required on all metal buildings or must use U- factor Compliance Method Require two layers of insulation CZ 5: R-13+R-13 CZ 6: R-13+R-19 Example (R-13+R-19): – R-13 draped perpendicularly to the purlins – R-19 running parallel to the purlins supported by the R-13
Vertical Fenestration Requirement (502.3.1) - Prescriptive Percentage of Vertical Fenestration Area to Gross Wall Area 26 Allows up to 40% maximum of above grade wall Question: What are typical fenestration percentages you see?
A commercial building in North Conway, NH will have a gross wall area of 15,000 ft 2. The building will have a vertical fenestration area of 7,500 ft 2. What building envelope compliance options are available for this project? 1.ASHRAE 90.1-2007 only 2.IECC Section 506 (Total Building Performance) only 3.IECC Section 502 (Building Envelope Requirements) and Section 506 (Total Building Performance) 4.1 and 2 only
Vertical Fenestration Requirement (502.3.1) 28 Based on above-grade wall area (gross) – Includes walls between conditioned space and unconditioned space or the outdoors Includes walls that are > 15% above grade Total fenestration area (includes frame and glazing) – Does not include opaque door area
Glazed Fenestration SHGC (502.3.2) 29 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.
Fenestration SHGC Requirements The Effect of Overhangs on Fenestration SHGC 30 Overhangs allow a higher SHGC product to be installed Projection factor must be calculated
Skylight U-Factor / SHGC 2006 IECC classified glass and plastic skylights 2009 IECC condensed into one category – Limited to 3% of Roof Area – U-factor and SHGC Based – NFRC 100 Rating for U-factor or Default Table 31 Category2006 IECC2009 IECC CZ 5CZ6CZ 5CZ6 Skylights U-factor Glass: 0.60 Plastic: 1.30 Glass: 0.90 Plastic: 1.300.60 SHGC Glass: 0.40 Plastic: 0.62 0.40
32 Mandatory 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: Caulking Gasketing Tapes Moisture vapor-permeable wrapping material Sealing materials spanning joints between dissimilar materials must allow for expansion and contraction
Mechanical Systems Compliance Process 34 Must the Project Comply with the IECC? Comply with the Envelope Requirements Comply with the Mechanical/SWH Requirements Comply with the 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
Major Changes to Mechanical Requirements Revises equipment efficiency tables for water-chilling packages Requires snow melt control Requires demand control ventilation (DCV) for certain spaces Removes exception for energy recovery ventilation for lab fume hood systems 15,000 cfm Lowers the system capacity for economizer requirement for NH climate zones 5A and 6A Introduces fan power limitations Reorganizes hydronic water loop heat pump section Introduces supply air temperature reset controls for multiple- zone systems 35
Section 503 Building Mechanical Systems 36 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)
Simple 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 503.2.3(1) through 503.2.3(5)] Section 503.3 Simple Systems Section 503.4 Complex Systems All buildings served by HVAC systems not covered under 503.3
A non-packaged HVAC system that is designed to serve multiple building zones would be referred to as a ______. 1.Simple system 2.Complex system 3.Variable air volume system 4.Unitary or packaged system
Equipment and System Sizing (503.2.2) 40 Output capacity SHALL NOT exceed sizing – Select the system which serves the greater load, heating or cooling – Exceptions Standby Equipment with Required Controls Multiple Units with Combined Capacities Exceeding Loads – Sequencing Controls Required
Multiple boilers-allowed to exceed load- if sequenced 41
According to Chapter 5, simple HVAC systems and equipment that meet the minimum equipment requirements listed in Tables 503.2.3 (1-11) shall be verified… 1.By an approved certification program, or if none exists, with manufacturers data 2.By the building official 3.Through testing procedures found in the ASHRAE Handbook of Fundamentals 4.By an onsite contractor at the time of equipment inspection
The 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. 1.35°F 2.45°F 3.40°F 4.50°F
45 Demand Controlled Ventilation (503.2.5.1) 2006 IECC had no DCV requirement 2009 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 economizer Automatic modulating control of the outdoor air damper, or A design outdoor airflow > 3,000 cfm Demand 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.
46 Demand Controlled Ventilation (503.2.5.1) - Exceptions Systems with energy recovery per 503.2.6 Multiple zone systems without direct digital control of single zones communicating with central control panel Systems with design outdoor airflow < 1,200 cfm Spaces where supply airflow rate minus any makeup or outgoing transfer air requirement < 1,200 cfm
47 Demand Controlled Ventilation (503.2.5.1) The wall and duct-mounted carbon dioxide (CO2) sensors are designed especially for demand- controlled ventilation zone applications.
50 Energy Recovery Ventilation (503.2.6) 2006 IECC: Exception for lab fume hood systems 15,000 cfm 2009 IECC: Removed only this exception, maintained all others
Economizers (503.3.1) CLIMATE ZONESECONOMIZER REQUIREMENT 1A, 1B, 2A, 7, 8No requirement 2B, 3A, 3B, 3C, 4A, 4B, 4C, 5A, 5B, 5C, 6A, 6B Economizers on cooling systems 54,000 Btu/h a a 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%) Table 503.3.1(1) 2006 IECC: CZ 5A and 6A - Economizers required on all systems 135,000 Btu/h 2009 IECC: Revised to 54,000 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 11.0. Is an economizer required for this system? 1.Yes, the system is greater than 90,000 Btu/h 2.No, the system meets the 10.9 EER requirement for tading-off 3.Yes, economizers cannot be traded off in CZ 5 4.No, there is no economizer requirement in CZ5.
Supply and return ducts and plenums are required to be insulated to… 1.R-8 in all locations 2.R-5 in all locations 3.R-5 in unconditioned spaces; R-8 exterior 4.R-8 in unconditioned spaces; R-5 exterior 5.None of the above
54 Air System Design and Control (503.2.10) 2006 IECC: No Requirement 2009 IECC: HVAC systems with total fan system power > 5 hp to meet 503.2.10.1 and 503.2.10.2 – Allowable Fan Floor Horsepower – Motor Nameplate Horsepower
55 Allowable 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 503.2.10.1(1) Exceptions – Hospital 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 limitation – Individual exhaust fans 1 hp – Fans exhausting air from fume hoods
56 Motor Nameplate Horsepower Selected fan motor to be no larger than first available motor size greater than bhp Fan bhp on design documents Exceptions – Fans < 6 bhp, where first available motor larger than bhp has nameplate rating within 50% of bhp, next larger nameplate motor size may be selected – Fans 6 bhp, where first available motor larger than bhp has nameplate rating within 30% of bhp, next larger nameplate motor size may be selected bhp = brake horsepower
57 Hydronic Water Loop Heat Pump Systems (503.4.3.3) All of 503.4.3.3 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 (503.4.3.3.1) 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 capacity
58 Hydronic Water Loop Heat Pump Systems (503.4.3.3) – contd Heat rejection equipment Open- or closed-circuit cooling tower used Must have a separate heat exchanger to isolate cooling tower from heat pump loop Heat loss controlled by shutting down circulation pump on cooling tower loop and providing an automatic valve to stop flow of fluid Two position valve (503.4.3.3.3) Required on each hydronic heat pump with total pump system power > 10 hp
59 Supply-Air Temperature Reset Controls (503.4.5.4) 2006 IECC: No requirement 2009 IECC: Multiple zone HVAC systems to have controls to automatically reset supply-air temperature in response to building loads or outdoor air temperature Controls to be capable of resetting supply air temperature at least 25% of difference between design supply-air temperature and design room air temperature Exceptions Systems that prevent reheating, recooling or mixing of heated and cooled supply air 75% of energy for reheating is from site-recovered or site solar energy sources Zones with peak supply air quantities of 300 cfm
SECTION 505: ELECTRICAL POWER AND LIGHTING SYSTEMS
The IECC Code Compliance Process 61 Must the Project Comply with the IECC? Comply with the Envelope Requirements Comply with the Mechanical/SWH Requirements Comply with the Power & Lighting Requirements Comply with the Power & Lighting Requirements Section 502 90.1 Section 5 Sections 503 and 504 90.1 Section 6 IECC Section 505 IECC Section 505 90.1-2007 Section 9 90.1-2007 Section 9 Document Compliance with the IECC Plan Review Inspection IECC Section 506 Building Performance Method IECC Section 506 Building Performance Method
Major Changes to Electrical/Lighting Systems Requirements Adds high-efficacy lighting requirement for dwelling units Requires separate controls for daylight zones Allows for use of photocell in tandem with other controls on certain exterior lighting applications Adds exempted lighting applications that can be excluded from total connected interior lighting power calculations Revises additional lighting power allowance calculations for retail areas Creates four exterior lighting zones based on lighting need 62
63 When do the Lighting and Power Requirements Apply? Original installed lighting system in a new building, addition, or tenant build-out Existing lighting system that is altered Change in occupancy that increases energy Exceptions: Historic buildings State or National listing Eligible to be listed Alterations where less than 50% of the luminaires are replaced and power is not increased Lighting within dwelling units Where 50% of permanently installed fixtures are high-efficacy lamps
High-Efficacy Lamps 64 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 wattage Lamp WattageEfficacy > 40 watts60 lumens/watt 15-40 watts50 lumens/watt < 15 watts40 lumens/watt
65 Whats Covered Under Electrical Power and Lighting Systems Requirements? Mandatory Interior Lighting Requirements Required Controls Wattage/Efficiency Limits Interior Lighting Power Allowances (watts/ft 2 ) Exterior Lighting Controls Required Controls Lamp Efficiency Exterior Lighting Power Allowances (watts/ft 2 ) Electric Metering
Interior Lighting Control (505.2): Basic Control Independent Lighting Control required for each space surrounded by floor-to-ceiling partitions Must be located in the space served, - or - Switched from a remote location Must have indicator that identifies the lights served and their status (off or on) Exemptions Security or emergency areas that must be continuously lighted Lighting in stairways or corridors that are elements of the means of egress 66 Intent: Allow occupants to control unneeded lighting!
Interior Lighting Control: Light Reduction 67 Light Reduction Controls must allow the occupant to reduce connected lighting By at least 50% In a reasonably uniform illumination pattern Intent: Allow occupants to moderate light levels to save energy! Note: Alternate Standard ASHRAE/IESNA 90.1-2007 does not require Light Reduction Control
Controlling all lamps or luminaires Dual switching of alternate rows of luminaires, alternate luminaires or lamps Switching middle lamp luminaires independently from the outer lamps Each luminaire or each lamp 68 Light Reduction Control Options SS Dimmer Switch D Alternating Luminaires Dimming SS Alternating lamps
Interior Lighting Control: Light Reduction Exemptions 69 Light Reduction Control Not required for the following: Areas with only one luminaire Areas controlled by occupancy sensor Corridors, storerooms, restrooms or public lobbies Sleeping units Spaces with <0.6 w/ft 2
Which of the following spaces must install light reduction controls? 1.Hotel sleeping unit 2.Public lobby in an office building 3.Office space with two luminaires 4.Restroom
Interior Lighting Control: Automatic Shutoff Automatic lighting shutoff control device required in all buildings larger than 5,000 ft 2 Building Defined: Any structure used or intended for supporting or sheltering any use or occupancy Building area surrounded by exterior walls and fire walls Exempted spaces Sleeping units Lighting for patient care When an automatic shutoff would endanger occupant safety or security 71 Intent: Eliminate after hours lighting waste!
Interior Lighting Control: Automatic Shutoff Options 1.Control lights on a scheduled basis (automatic time switch) Time-of-day controller Controls 25,000 ft 2 and not more than one floor, or 2.Occupant sensor Turn lights off within 30 minutes of occupant leaving the space 3.Signal from another control or alarm that indicates the area is unoccupied 72 Automatic Lighting Shutoff Compliance Options Courtesy Britt-Makela Group
Interior Lighting Control: Automatic Shutoff Override Readily accessible Within view of the lights or area controlled Manually operated 2 hour override Controls an area 5,000 ft 2 Exemptions Can be over 2 hour override in malls and arcades, auditoriums, single- tenant retail space, industrial facilities and arenas when using captive key override Override in malls and arcades, auditoriums, single-tenant retail space, industrial facilities and arenas can cover up to 20,000 ft 2 73
Automatic lighting shutoff is not required in buildings that are a maximum of ______ square feet. 1.10,000 2.7,500 3.5,000 4.2,500
75 Daylight 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, or The distance to a ceiling height opaque partition, or One-half the distance to adjacent skylights or windows
Daylight 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 less The daylight zone width is assumed to be: the width of the window plus 2 feet on each side, or the window width plus distance to opaque partitions, or the window width plus one-half the distance to adjacent skylight or vertical fenestration, whichever is least. 76
77 Daylight Zone Control Daylight zones – Must have individual control of the lights independent of general area lighting
Interior Lighting Power Limits (505.5) 78 Connected Interior Lighting Power must not exceed Interior Lighting Power Allowance 1.Calculate Interior Lighting Power Allowance Building Area type allowance Additional allowances 2.Calculate proposed connected lighting power Wattage calculation rules Exempted lighting 3.Compare values: proposed wattage must be less than or equal to allowed wattage Intent: Eliminate waste from sloppy lighting design and application!
79 Interior Lighting Power Allowances Building Area Type Note: Alternate Standard ASHRAE/IESNA 90.1-2007 provides whole building and space-by-space options Table 505.5.2
80 Interior Lighting Power Allowance Calculation First, choose an appropriate Building Area Type from the allowance table (505.5.2). – Building Area includes all spaces that are associated with that business or function type. For example a space with: Corridors, Restrooms, A lobby, and Office space …would be considered an Office Building Area Type Then...multiply the lighting power density (W/ft 2 ) by the building square footage to get allowed watts for compliance
81 A 200,000 ft 2 office building that contains corridor, restrooms, break rooms and a lobby is given 1.0 W/ft 2 for the entire building Office: 200,000 ft 2 1.0 W/ft 2 = 200,000 W Office - Example Table 505.5.2
82 Interior 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 types Museum:40,000 ft 2 Retail:5,000 ft 2 Cafeteria:10,000 ft 2 Use the more specific building area type where more than one area type exists in the building Sum the individual (lighting power density X area square footage) values for Total Power Allowance
83 Museum: 40,000 ft 2 at 1.1 W/ft 2 = 44,000 W Cafeteria:10,000 ft 2 at 1.4 W/ft 2 = 14,000 W Retail:5,000 ft 2 at 1.5 W/ft 2 = 7,500 W Total watts allowed = 65,500 W Multiple Occupancy Building - Example Table 505.5.2
Additional Retail Lighting Power Allowance (Table 505.5.2 – Footnotes) 84 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!
Proposed Lighting Power Calculation 85 Sum the wattage of all proposed connected lighting power This must include all lighting that is part of the design for the space including: – Overhead lighting – Task lighting – Decorative lighting Note: Wattage must be calculated based on actual power draw…not just nominal lamp rating
When documenting the total connected lighting power for a proposed building, what wattage should be used for a screw lamp holder? 1.Wattage of the light bulb proposed for the fixture 2.Maximum labeled wattage of the luminaire 3.300 watts per fixture 4.100 watts per fixture
Exemptions to Proposed Lighting Power Calculation Connected power for following not included in calculations: – Professional sports arena playing field – Sleeping unit lighting – Emergency lighting automatically off during normal building operation – Lighting in spaces specifically designed for use by occupants with special lighting needs including visual impairment and other medical and age related issues – Lighting in interior spaces specifically designated as a registered interior historic landmark – Casino gaming areas Lighting equipment used for the following exempt if in addition to general lighting and controlled by an independent control device – Task lighting for medical and dental procedures – Display lighting for exhibits in galleries, museums and monuments Theatrical, stage, film, and video production Used for photographic processes Integral to equipment or instrumentation installed by manufacturer Plant growth or maintenance Advertising or directional signage Food warming and food prep equipment (in restaurant buildings and areas) Lighting equipment that is for sale Lighting demonstration equipment in lighting education facilities Approved because of safety or emergency considerations, exclusive of exit lights Integral to both open and glass-enclosed refrigerator and freezer cases In retail display windows when the display is enclosed by ceiling-height partitions Furniture-mounted supplemental task lighting controlled by automatic shutoff 87
What if My Proposed Design Does Not Meet Code? Check calculations – Appropriate area type allowances used? – Actual lighting equipment wattages used? …and design – Reasonable illuminance levels provided? – Efficient light sources used? Use alternate Standard 90.1-2007* Use total Building Performance Method *Section 501.2 Application requires 90.1 to be used in its entirety (Envelope, Lighting, Mechanical) if used as an alternate compliance path 88
Exterior Lighting Control Requirements (505.2.4) For dusk-to-dawn lighting: astronomical time switch or photosensor For all other: astronomical time switch OR photosensor + time switch All time switches must have 10 hour battery backup 89
Exterior Efficiency Requirement (505.6.1) Building grounds lighting luminaires over 100 watts must have source efficacy of at least 60 lumens per watt 90 Exceptions: Controlled by motion sensor Any of the exterior lighting power allowance exceptions As approved for a historical, safety, signage, or emergency consideration
Exterior Lighting Power Limits (505.6.2) Connected Exterior Lighting Power must not exceed Exterior Lighting Power Allowance – Calculate exterior Lighting Power Allowance Lighting power densities by exterior function and by applicable lighting zone – Calculate proposed connected lighting power Wattage calculation rules Exempted lighting – Compare values: proposed wattage must be less than or equal to allowed wattage 91
Exterior Lighting Power Limits (505.6.2) 92 What areas are covered under exterior lighting allowances? – Tradable surfaces Common 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 surfaces Less common exterior lighted needs that cannot be traded for other needs. These applications have more specific security or task illuminance needs.
Tradable Surfaces 93 Uncovered parking lots and areas Walkways (under and over 10 feet wide) Stairways Pedestrian tunnels Main building entrances Other doors Entry canopies Free-standing and attached sales canopies Open sales areas Street frontage sales areas
Nontradable Surfaces Building facades Automated teller machines and night depositories Entrances and gatehouse inspection stations at guarded facilities Loading areas for law enforcement, fire, ambulance and other emergency vehicles Drive-up windows/doors Parking near 24-hour retail entrances 94
Exterior Lighting Zones [Table 505.6.2(1)] Lighting ZoneDescription 1Developed areas of national parks, state parks, forest land, and rural areas 2Areas predominantly consisting of residential zoning, neighborhood business districts, light industrial with limited nighttime use and residential mixed use areas 3All other areas 4High-activity commercial districts in major metropolitan areas as designated by the local land use planning authority 95
Exterior Lighting Zones Zone 1Zone 2Zone 3Zone 4 Base Site Allowance 500 W600 W750 W1300 W Tradable SurfacesUncovered Parking Areas Parking areas and drives0.04 W/ft 2 0.06 W/ft 2 0.10 W/ft 2 0.13 W/ft 2 Building Grounds Walkways less than 10 feet wide 0.7 W/linear foot 0.8 W/linear foot 1.0 W/linear foot Walkways 10 feet wide or greater 0.14 W/ft 2 0.16 W/ft 2 0.2 W/ft 2 Plaza areas Special Feature Areas Stairways0.75 W/ft 2 1.0 W/ft 2 Pedestrian Tunnels0.15 W/ft 2 0.2 W/ft 2 0.3 W/ft 2 96
Above Code Programs The field is advancing…quickly 99
Above Code Programs 100 Stretch Codes Green Building Rating Systems Green Building Codes Net Zero/Living Buildings Baseline: ASHRAE 90.1-2007 or 2009 IECC (New Hampshire Amendments)
Above Code Programs Why go beyond code? Owner-driven – Save energy – Marketing – Internal goals Jurisdictional requirement Designer-driven
What percent of projects that you work on exceed the energy code (best guess)? 1.Less than 25% 2.25% - 50% 3.50%-75% 4.75% + 5.Dont Know!
New Buildings Institute (NBI) Core Performance Program Buildings < 70,000 ft2 20% - 30% Savings over ASHRAE 90.1-2004 Codified in Massachusetts Stretch Code Prescriptive path for LEED Energy & Atmosphere points (Eac1) o No energy modeling required 103
NBI Core Performance Program Design Process Strategies – Integrated Design Core Performance Requirements – Delivers consistent savings across building types, climates Enhanced Performance Strategies – Optional measures certain systems or building types Energy Modeling – Optional to pursue aggressive energy savings or show alternative compliance to prescriptive path 104
Green Building Rating Systems USGBC LEED / CHPS / Green Globes Third party certification programs Baseline energy code: ASHRAE 90.1-2007 Energy savings only one focus area – Sustainable Sites – Water Efficiency – Materials & Resources – Indoor Environmental Quality – Innovation & Design Collaborative for High Performance Schools (CHPS): – K-12 schools; Northeast-specific 105
Have you worked on a project that received a green building certification? 1.Yes 2.No 3.Maybe
Are you currently working on a project that is aiming to receive certification? 1.Yes 2.No 3.Maybe
Which rating system (s) have your projects utilized? 1.USGBC LEED (NC, EB, CI, etc) 2.NE-CHPS 3.Green Globes 4.All of the above 5.At least two of the above
Are you a LEED-Accredited Professional (AP) or LEED Green Associate? 1.Yes 2.No
Green Building Rating Systems Minimum Energy Performance: 110
Green Building Rating Systems 111 Source: USGBC
ASHRAE Standard 189.1 ANSI standard being developed in model code language Provides minimum requirements for high-performance, green buildings Applies 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 system Source: Introduction to Standard 189.1 www.ashrae.org/publications/page/927 112
ASHRAE Standard 189.1 SSSS WEWE EEEE IEQIEQ MRMR COCO Sustainable Sites Water Use Efficiency Energy Efficiency Indoor Environmental Quality Buildings Impact on the Atmosphere, Materials & Resources Construction and Operations Plans Source: Introduction to Standard 189.1 www.ashrae.org/publications/page/927 Topic Areas
International Green Construction Code High performance, green building code Consistent with I-Codes Allows ASHRAE 189.1 to be a compliance option Energy performance: 30% + 2006 IECC Expected full release in early 2012 Source: Introduction to Standard 189.1 www.ashrae.org/publications/page/927 114
Living Building Challenge No credits, just prerequisites Requires Net Zero Energy 115
Above Code Resources DOE Stretch Code Programs: www.energycodes.gov/why_codes/stretch_beyond.stm www.energycodes.gov/why_codes/stretch_beyond.stm NBI: http://newbuildings.orghttp://newbuildings.org DOE Net Zero Energy Commercial Building Initiative: www1.eere.energy.gov/buildings/commercial_initiative/ USGBC LEED: www.usgbc.orgwww.usgbc.org NE-CHPS: http://neep.org/public-policy/hpse/hpse-nechpshttp://neep.org/public-policy/hpse/hpse-nechps Green Globes: www.greenglobes.comwww.greenglobes.com ASHRAE 189.1: http://www.ashrae.org/publications/page/927http://www.ashrae.org/publications/page/927 IGCC: http://www.iccsafe.org/cs/IGCC/Pages/default.aspxhttp://www.iccsafe.org/cs/IGCC/Pages/default.aspx 116