National Energy Code of Canada for Buildings 2015 – Intent Statements
From: National Research Council Canada
Alternate format: National Energy Code of Canada for Buildings 2015: Intent Statements (PDF, 0.6 MB)
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Table of contents
- Title page
- Preface
- Division A Compliance, Objectives and Functional Statements
- Part 1 - Compliance
- Section 1.4. Terms and Abbreviations
- 1.4.1. Definitions of Words and Phrases
- Section 1.4. Terms and Abbreviations
- Part 2 - Objectives
- Section 2.2. Objectives
- 2.2.1. Objectives
- Section 2.2. Objectives
- Part 3 - Functional Statements
- Section 3.2. Functional Statements
- 3.2.1. Functional Statements
- Section 3.2. Functional Statements
- Part 1 - Compliance
- Division B Acceptable Solutions
- Part 3 - Building Envelope
- Section 3.1. General
- 3.1.1. General
- 3.1.1.1. Scope
- 3.1.1.2. Application
- 3.1.1.3. Compliance
- 3.1.1.4. Definitions
- 3.1.1.5. Thermal Characteristics of Building Assemblies
- 3.1.1.6. Calculation of Fenestration and Door Areas
- 3.1.1.7. Calculation of Overall Thermal Transmittance
- 3.1.1. General
- Section 3.2. Prescriptive Path
- 3.2.1. General
- 3.2.1.1. Protection of Insulation Materials
- 3.2.1.2. Continuity of Insulation
- 3.2.1.3. Spaces Heated to Different Temperatures
- 3.2.1.4. Allowable Fenestration and Door Area
- 3.2.2. Above-ground Components of the Building Envelope
- 3.2.2.1. Vestibules
- 3.2.2.2. Thermal Characteristics of Above-ground Opaque Building Assemblies
- 3.2.2.3. Thermal Characteristics of Fenestration
- 3.2.2.4. Thermal Characteristics of Doors and Access Hatches
- 3.2.3. Building Assemblies in Contact with the Ground
- 3.2.3.1. Thermal Characteristics of Walls in Contact with the Ground
- 3.2.3.2. Thermal Characteristics of Roofs in Contact with the Ground
- 3.2.3.3. Thermal Characteristics of Floors in Contact with the Ground
- 3.2.4. Air Leakage
- 3.2.4.1. General
- 3.2.4.2. Opaque Building Assemblies
- 3.2.4.3. Fenestration
- 3.2.4.4. Doors
- 3.2.4.5. Fireplace Doors
- 3.2.1. General
- Section 3.3. Trade-off Path
- 3.3.1. Simple Trade-off Path
- 3.3.1.1. Application and Limitations
- 3.3.1.2. Simple Trade-off Calculations
- 3.3.1. Simple Trade-off Path
- Section 3.4. Performance Path
- 3.4.1. General
- 3.4.1.1. Scope
- 3.4.1.2. Limitations
- 3.4.1. General
- Section 3.1. General
- Part 4 - Lighting
- Section 4.1. General
- 4.1.1. General
- 4.1.1.1. Scope
- 4.1.1.2. Application
- 4.1.1.3. Compliance
- 4.1.1.4. Definitions
- 4.1.1. General
- Section 4.2. Prescriptive Path
- 4.2.1. Interior Lighting Power
- 4.2.1.1. Exit Signs
- 4.2.1.2. Fluorescent Lamp Ballasts
- 4.2.1.3. Limits to Installed Interior Lighting Power
- 4.2.1.4. Determination of the Installed Interior Lighting Power
- 4.2.1.5. Calculation of Interior Lighting Power Allowance Using the Building Area Method
- 4.2.1.6. Calculation of Interior Lighting Power Allowance Using the Space-by-Space Method
- 4.2.2. Interior Lighting Controls
- 4.2.2.1. Interior Lighting Controls
- 4.2.2.2. Lighting Controls in Storage Garages
- 4.2.2.3. Determination of Primary and Secondary Sidelighted Areas
- 4.2.2.4. Determination of Daylighted Area Under Roof Monitors
- 4.2.2.5. Determination of Daylighted Area Under Skylights
- 4.2.2.6. Special Applications
- 4.2.3. Exterior Lighting Power
- 4.2.3.1. Exterior Lighting
- 4.2.4. Exterior Lighting Controls
- 4.2.4.1. Requirements
- 4.2.1. Interior Lighting Power
- Section 4.3. Trade-off Path
- 4.3.1. General
- 4.3.1.1. Application
- 4.3.1.2. Limitation
- 4.3.1.3. Compliance
- 4.3.2. Installed Interior Lighting Energy
- 4.3.2.1. Determination of Installed Interior Lighting Energy
- 4.3.2.2. Determination of Lighting Power Density
- 4.3.2.3. Determination of Daylighted Area
- 4.3.2.4. Determination of Non-Daylighted Area
- 4.3.2.5. Determination of Effective Annual Operational Times
- 4.3.2.6. Determination of Operational Times
- 4.3.2.7. Determination of Factor for Daylight Harvesting
- 4.3.2.8. Determination of the Daylight Supply Factor for Sidelighting
- 4.3.2.9. Determination of the Daylight Supply Factor for Toplighting
- 4.3.2.10. Determination of Factors for Occupancy Control and Personal Control
- 4.3.3. Interior Lighting Energy Allowance
- 4.3.3.1. Determination of Interior Lighting Energy Allowance
- 4.3.3.2. Determination of Lighting Power Density
- 4.3.3.3. Determination of Daylighted Area
- 4.3.3.4. Determination of Non-Daylighted Area
- 4.3.3.5. Determination of Effective Annual Operational Times
- 4.3.3.6. Determination of Operational Times
- 4.3.3.7. Determination of Factor for Daylight Harvesting
- 4.3.3.10. Determination of Factors for Occupancy Control and Personal Control
- 4.3.1. General
- Section 4.4. Performance Path
- 4.4.1. General
- 4.4.1.1. Scope
- 4.4.1. General
- Section 4.1. General
- Part 5 - Heating, Ventilating and Air-conditioning Systems
- Section 5.1. General
- 5.1.1. General
- 5.1.1.1. Scope
- 5.1.1.2. Application
- 5.1.1.3. Compliance
- 5.1.1.4. Definitions
- 5.1.1. General
- Section 5.2. Prescriptive Path
- 5.2.1. Equipment Sizing
- 5.2.1.1. Load Calculations
- 5.2.2. Air Distribution Systems
- 5.2.2.1. Design and Installation of Ducts
- 5.2.2.2. Provision for Balancing
- 5.2.2.3. Duct Sealing
- 5.2.2.4. Leakage Testing of Ducts
- 5.2.2.5. Duct and Plenum Insulation
- 5.2.2.6. Protection of Duct Insulation
- 5.2.2.7. Cooling with Outdoor Air
- 5.2.2.8. Cooling by Direct Use of Outdoor Air (Air Economizer System)
- 5.2.2.9. Cooling by Indirect Use of Outdoor Air (Water Economizer System)
- 5.2.3. Fan System Design
- 5.2.3.1. Application
- 5.2.3.2. Constant-Volume Fan Systems
- 5.2.3.3. Variable-Air-Volume Fan Systems
- 5.2.3.4. Demand Control Ventilation Systems
- 5.2.4. Air Intake and Outlet Dampers
- 5.2.4.1. Required Dampers
- 5.2.4.2. Type and Location of Dampers
- 5.2.5. Piping for Heating, Ventilating and Air-conditioning Systems
- 5.2.5.1. Design and Installation of Piping
- 5.2.5.2. Provision for Balancing
- 5.2.5.3. Piping Insulation
- 5.2.5.4. Protection of Piping Insulation
- 5.2.6. Pumping System Design
- 5.2.6.1. Application
- 5.2.6.2. Variable-Flow Pumping Systems
- 5.2.6.3. Pumping Power Demand
- 5.2.7. Equipment Installed Outdoors
- 5.2.7.1. Manufacturer’s Designation
- 5.2.8. Temperature Controls
- 5.2.8.1. Temperature Controls
- 5.2.8.2. Temperature Control within Dwelling Units
- 5.2.8.3. Installation of Thermostats
- 5.2.8.4. Heat Pump Controls
- 5.2.8.5. Space Temperature Control
- 5.2.8.6. Ice- and Snow-Melting Heater Controls
- 5.2.8.7. Control of Temperature of Air Leaving the Supply Air Handler
- 5.2.8.8. Control of Space Temperature by Reheating or Recooling
- 5.2.9. Humidification
- 5.2.9.1. Humidification Controls
- 5.2.10. Heat Recovery
- 5.2.10.1. Heat-Recovery Systems
- 5.2.10.2. Heat Recovery from Dehumidification in Swimming Pools
- 5.2.10.3. Heat Recovery from Ice-making Machines in Ice Arenas and Curling Rinks
- 5.2.10.4. Heat Recovery in Dwelling Units
- 5.2.11. Shut-off and Setback Controls
- 5.2.11.1. Off-hours Controls
- 5.2.11.2. Airflow Control Areas
- 5.2.11.3. Seasonal Shutdown
- 5.2.11.4. Multiple Boilers
- 5.2.11.5. Loop Temperature Reset for Chilled- and Hot-Water Systems
- 5.2.12. Equipment Efficiency
- 5.2.12.1. Unitary and Packaged HVAC Equipment
- 5.2.12.2. Heat Rejection Equipment
- 5.2.12.3. Field-Assembled Equipment and Components
- 5.2.12.4. Service Water Heating Equipment Used for Space Heating
- 5.2.1. Equipment Sizing
- Section 5.3. Trade-off Path
- 5.3.1. General
- 5.3.1.1. Application
- 5.3.1.2. Application Limitation
- 5.3.1.3. Compliance
- 5.3.1.4. Definition
- 5.3.2. Compliance Calculation
- 5.3.2.1. HVAC Trade-off Index
- 5.3.2.2. Determination of Components to Be Included, γi
- 5.3.2.3. Determination of Trade-off Value of Components, ToV i
- 5.3.2.4. Determination of Base Value of Components, BaV i
- 5.3.2.5. Determination of Weighting Factor Linking the Component Efficiency Variation to the System Efficiency Variation, α i and β i
- 5.3.2.6. Determination of Climatic Parameter Relevant to the Component, XDD i
- 5.3.2.7. Determination of Trade-off Value of Component, ToV i
- 5.3.2.8. Coefficient Values: α1 i, α2 i, α3 i, β1 i, β2 i and β3 i
- 5.3.1. General
- Section 5.4. Performance Path
- 5.4.1. General
- 5.4.1.1. Scope
- 5.4.1.2. Limitations
- 5.4.1. General
- Section 5.1. General
- Part 6 - Service Water Systems
- Section 6.1. General
- 6.1.1. General
- 6.1.1.1. Scope
- 6.1.1.2. Application
- 6.1.1.3. Compliance
- 6.1.1.4. Definitions
- 6.1.1. General
- Section 6.2. Prescriptive Path
- 6.2.1. System Design
- 6.2.1.1. Regulations
- 6.2.2. Water Heating Equipment and Storage Vessels
- 6.2.2.1. Equipment Efficiency
- 6.2.2.2. Equipment Insulation
- 6.2.2.3. Solar Thermal Service Water Heating Equipment
- 6.2.2.4. Combination Service Water Heating and Space-Heating Equipment
- 6.2.2.5. Space-Heating Equipment Used for Indirect Service Water Heating
- 6.2.3. Piping
- 6.2.3.1. Insulation
- 6.2.4. Controls
- 6.2.4.1. Temperature Controls
- 6.2.4.2. Shutdown
- 6.2.4.3. Maintaining Temperature of Hot Service Water
- 6.2.5. Systems with More Than One End Use Design Temperature
- 6.2.5.1. Remote or Booster Heaters
- 6.2.6. Hot Service Water
- 6.2.6.1. Showers
- 6.2.6.2. Lavatories
- 6.2.7. Swimming Pools
- 6.2.7.1. Controls
- 6.2.7.2. Pool and Hot Tub Covers
- 6.2.8. Pressure Booster Systems
- 6.2.8.1. Size of Water Storage Tank
- 6.2.8.2. Pressure Control
- 6.2.1. System Design
- Section 6.3. Trade-off Path
- 6.3.1. General
- 6.3.1.1. Application
- 6.3.1.2. Application Limitation
- 6.3.1.3. Compliance
- 6.3.2. Calculation of Service Water Heating Trade-off Index
- 6.3.2.1. SWH Trade-off Index
- 6.3.2.2. Determination of Peak Daily Flow Ratio
- 6.3.2.3. Determination of Normalized Tank Area
- 6.3.2.4. Determination of Normalized Tank Diameter
- 6.3.2.5. Determination of Trade-off Values of Components, ToV i
- 6.3.2.6. Determination of Reference Heat Generator Efficiency, η ref
- 6.3.1. General
- Section 6.4. Performance Path
- 6.4.1. General
- 6.4.1.1. Scope
- 6.4.1.2. Limitations
- 6.4.1. General
- Section 6.1. General
- Part 7 - Electrical Power Systems and Motors
- Section 7.1. General
- 7.1.1. General
- 7.1.1.1. Scope
- 7.1.1.2. Application
- 7.1.1.3. Compliance
- 7.1.1.4. Definitions
- 7.1.1. General
- Section 7.2. Prescriptive Path
- 7.2.1. Electrical Distribution System
- 7.2.1.1. Monitoring
- 7.2.2. Voltage Drop
- 7.2.2.1. Feeders
- 7.2.2.2. Branch Circuits
- 7.2.3. Transformers
- 7.2.3.1. Transformer Selection
- 7.2.4. Electrical Motors
- 7.2.4.1. Efficiency
- 7.2.1. Electrical Distribution System
- Section 7.4. Performance Path
- 7.4.1. General
- 7.4.1.1. Scope
- 7.4.1. General
- Section 7.1. General
- Part 8 - Building Energy Performance Compliance Path
- Section 8.1. General
- 8.1.1. General
- 8.1.1.1. Scope
- 8.1.1.2. Application
- 8.1.1.3. Definitions
- 8.1.1. General
- Section 8.4. Performance Path
- 8.4.1. Compliance
- 8.4.1.1. General
- 8.4.1.2. Determination of Compliance
- 8.4.1.3. Limitations
- 8.4.1.4. Treatment of Additions
- 8.4.2. Compliance Calculations
- 8.4.2.1. General
- 8.4.2.2. Calculation Methods
- 8.4.2.3. Climatic Data
- 8.4.2.4. Thermal Mass
- 8.4.2.5. Space Temperature
- 8.4.2.6. Heat Transfer Between Thermal Blocks
- 8.4.2.7. Internal and Service Water Heating Loads
- 8.4.2.8. Building Envelope
- 8.4.2.9. Air Leakage
- 8.4.2.10. HVAC Systems Calculations
- 8.4.3. Annual Energy Consumption of Proposed Building
- 8.4.3.1. General
- 8.4.3.2. Operating Schedules, Internal Loads, Service Water Heating Loads and Set-point Temperature
- 8.4.3.3. Building Envelope Components
- 8.4.3.4. Interior Lighting
- 8.4.3.5. Purchased Energy
- 8.4.3.6. Outdoor Air
- 8.4.3.7. Space Temperature Control
- 8.4.3.8. Part-Load Performance Curves
- 8.4.3.9. Ice Plants
- 8.4.4. Building Energy Target of the Reference Building
- 8.4.4.1. General
- 8.4.4.2. Operating Schedules, Internal Loads, Service Water Heating Loads and Set-point Temperature
- 8.4.4.3. Building Envelope Components
- 8.4.4.4. Thermal Mass
- 8.4.4.5. Lighting
- 8.4.4.6. Purchased Energy
- 8.4.4.7. HVAC System Selection
- 8.4.4.8. Equipment Oversizing
- 8.4.4.9. Heating System
- 8.4.4.10. Cooling Systems
- 8.4.4.11. Cooling Tower Systems
- 8.4.4.12. Cooling with Outside Air
- 8.4.4.13. Heat Pumps
- 8.4.4.14. Hydronic Pumps
- 8.4.4.15. Outdoor Air
- 8.4.4.16. Space Temperature Control
- 8.4.4.17. Fans
- 8.4.4.18. Supply Air Systems
- 8.4.4.19. Heat-Recovery System
- 8.4.4.20. Service Water Heating Systems
- 8.4.4.21. Part-Load Performance Curves
- 8.4.1. Compliance
- Section 8.1. General
- Part 3 - Building Envelope