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Energy Codes and the Building Envelope
Civil Engineering and Architecture © 2010 Project Lead The Way, Inc.
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Goal of Energy Efficient Design
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Goal of Energy Efficient Design Conserve Natural Resources Save the Environment Preserve Ozone Layer Create Healthier Living Spaces Reduce Costs 2
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Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities A Few Acronyms ASHREA = American Society of Heating, Refrigerating, and Air-Conditioning Engineers ICC = International Code Council IECC = International Energy Conservation Code
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Codes, Standards, and Model Codes
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Codes, Standards, and Model Codes Code Specifies how the building must be constructed Example: Indiana State Building Code Standard Describes how a building should be constructed Example: ASHRAE Model Code Recommendation for a code that may be adopted by a state or local jurisdiction Often adopted and modified by local jurisdictions Examples: IBC, IECC
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Commercial Energy Usage
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Commercial Energy Usage Office, retail, and service buildings are the largest consumers of energy in the United States About half of this energy is consumed by lighting Energy Codes and Standards set a minimum level of energy performance with which the building must comply
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Commercial Energy Codes
Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Commercial Energy Codes Commercial energy codes apply to all buildings EXCEPT: One- and two-family residential buildings Multi-unit residential buildings three stories or less in height
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Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Energy Codes Codes and standards may be enforced at the state, local, or jurisdictional level Voluntary Energy-Efficiency Programs Home Energy Rating System (HERS) ENERGY STAR Good Cents LEED
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Commercial Energy Codes
Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Commercial Energy Codes A few states have adopted the most recent versions (dark green) Some states have no statewide energy code (white) Most have adopted an older version of ASHRAE/IECC but will typically update as code requirements periodically change Most recent standard/model code is ASHRAE /2009 IECC Courtesy US DOE
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We’ll Look at ASHRAE/IESNA Standard 90.1-2007
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities We’ll Look at ASHRAE/IESNA Standard 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
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2009 IECC Climate Zones Keystone Library
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities 2009 IECC Climate Zones Keystone Library The Keystone Library Renovation project in Noblesville, Indiana, is within Zone 5 of the 2009 IECC Climate Zones. Code requirements are based on climate zones
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Commercial Energy Codes
Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Commercial Energy Codes Building Envelope Lighting Mechanical Service Water Heating COMMERCIAL Commercial energy codes address four broad categories: building envelope, lighting, mechanical (HVAC), and service water heating. We will concentrate on the energy code requirements for the building envelope in this presentation.
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What is a Building Envelope?
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities What is a Building Envelope? Roof/ceiling Exterior walls Vertical fenestration (glazing) and skylights Lowest floor Slab edge Below grade walls
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Building Envelope Sealing Vapor Barrier Insulation Fenestration
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Building Envelope Filling small spaces in building envelope with a soft waterproof material Sealing Membrane that restricts the movement of moisture Vapor Barrier Material used to reduce the transmission of heat Insulation Glass used in the building envelope Fenestration Four important considerations with respect to the building envelope are sealing, vapor barrier, insulation, and fenestrations.
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Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Sealing Requirements All fenestration, openings, joints, and seams in the building envelope must be sealed with one of the following Caulk Gasket Tape Moisture vapor-permeable wrapping material
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Insulation Requirements
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Building Envelope Requirements for Climate Zone 5 This table is based on the 2009 International Energy Code Requirements for nonresidential buildings and provides the insulation maximum U for the entire assembly and the required insulation R-value
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Roof Insulation Requirement Keystone Library
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Roof Insulation Requirement Keystone Library Insulation entirely above deck: R-20 c.i. Where c.i. = continuous insulation SURFACING INSULATION METAL DECK STEEL OPEN WEB JOIST
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Wall Insulation Requirement Keystone Library
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Wall Insulation Requirement Keystone Library Mass wall above grade: R-11.4 c.i. What types and thicknesses of insulation would meet the code in this application? BRICK AIR GAP A masonry or concrete wall is considered a mass wall. So the existing walls in the Keystone building are mass walls. The new second floor wall may be something other than a mass wall. R-11.4 INSULATION 8” CMU
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Floor Insulation Requirements Keystone Library
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Floor Insulation Requirements Keystone Library Mass floor (slab-on-grade) unheated: no requirement Note: When required, this perimeter insulation must be placed around the exterior edge of the slab. Accepted perimeter insulation configurations
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Opaque Door Requirements Keystone Library
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Opaque Door Requirements Keystone Library Opaque doors have < 50% glass area Door type Swinging door: U (or less) Overhead door: U (or less)
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Reminder: U-Factor The rate of heat loss through the window
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Reminder: U-Factor The rate of heat loss through the window The lower the U-factor, the less heat is lost Reciprocal of R-value (1/R)
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Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Fenestration All areas (including the frames) in the building envelope that let in light Examples include windows, plastic panels, clerestories, skylights, glass doors that are more than one-half glass, and glass block walls A skylight is a fenestration surface having a slope of less than 60 degrees from the horizontal plane
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Fenestration Requirements
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Fenestration Requirements Fenestration selection is often strongly influenced by energy codes U-Factor and Solar Heat Gain Coefficient may be specified in codes Wonder Window, Co.
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Fenestration Requirements Keystone Library
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Fenestration Requirements Keystone Library Fenestration area must be less than 40% maximum of above grade wall area Building Envelope Requirements for Climate Zone 5 The insulation requirements for fenestrations is given in terms of U-factors and Solar Heat Gain Coefficients.
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Fenestration Requirements Definitions
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Fenestration Requirements Definitions Curtain Wall – Fenestration products used to create an external non-load bearing wall that is designed to separate the exterior and interior environments Storefront – A nonresidential system of doors and windows mulled as a composite fenestration structure that has been designed to withstand heavy use Entrance Door – Fenestration products used for ingress, egress, and access in nonresidential buildings, including but not limited to, exterior entrances that utilize latching hardware and automatic closers that contain over 50% glass specifically designed to withstand heavy use and possible abuse
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Solar Heat Gain Coefficient (SHGC)
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Solar Heat Gain Coefficient (SHGC) The fraction of incident solar radiation admitted through a window Expressed as a number between 0 and 1 The lower a window's solar heat gain coefficient, the less solar heat it transmits
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Overhangs and Fenestration Requirements
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Overhangs and Fenestration Requirements Overhangs can decrease requirement for SHGC (in some climates) Calculate the Projection Factor, PF
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Solar Heat Gain Coefficient (SHGC)
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Solar Heat Gain Coefficient (SHGC) Southern climates with high cooling loads SHGC is more important than the U-factor in promoting energy efficiency Choose lowest SHGC possible Northern climates with insignificant cooling loads Choose highest SHGC to promote solar heat gain during cold weather
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SHGC Requirements Keystone Project
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities SHGC Requirements Keystone Project If : U-0.40 or less Otherwise: no requirement
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Vestibule Requirements
Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Vestibule Requirements A small entrance area between the outer door and the interior door Required at entrance leading to spaces ≥ 3000 ft2 Doors must have self-closing devices Exceptions: Buildings in climate zone 1 Doors from guest room or dwelling Doors for vehicles, material handling, and adjacent personnel doors DOE
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Energy Codes Civil Engineering and Architecture® Unit 3 – Lesson 3.3 – Services and Utilities Resources Barlett, R., Halverson, M.A., & Shankle, D. L. (year). Understanding building energy codes and standards. Publication no. PNNL-14235: U. S. Efficient Windows Collaborative. (n.d.). Retrieved December 15, 2009, from Department of Energy. (n.d). Building energy codes program. Retrieved December 15, 2009, from International Code Council (2009). International energy conservation code and ANSI/ASHRAE/IESNA standard energy standard for buildings except low rise residential buildings. Country Club Hills, IL: Author.
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