Update of the national energy code for buildings
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Update of the National Energy Code for Buildings. Outline. Recent history of the Energy Code development in Canada National Energy Code for Buildings (NECB) 2011 Impetus for updating the 1997 Model National Energy Code for Buildings Approach used in NECB and details. History.

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Update of the national energy code for buildings

Update of theNational Energy Code for Buildings


Outline

Outline

  • Recent history of the Energy Code development in Canada

  • National Energy Code for Buildings (NECB) 2011

    • Impetus for updating the 1997 Model National Energy Code for Buildings

    • Approach used in NECB and details


History

History

Model National Energy Code for Buildings 1997

  • Prescriptive approach: building envelope, HVAC, service water heating, lighting, electrical power

  • Engineering approach: performance  “Performance Compliance for Buildings”

    • reference and proposed building modeling

  • Model National Energy Code for Houses (MNECH) published in 1997


History cont d

History (cont’d)

  • Total life-cycle costing

  • Different construction requirements for different energy sources

  • Regional variations in energy costs

  • Not widely adopted


Decision to update

Decision to Update

  • June 2005 Canadian Commission on Building and Fire Codes (CCBFC) meeting

    • NRCan presentation and request for update

  • Motion

    • “Moved … and seconded … that CCBFC supports, as a first phase, the work on the technical basis for the development of the revisions to the MNECB as a progeny document on condition that the necessary support and funding for the project is provided from NRCan and/or others.”


Decision to update1

Decision to Update

  • Building Energy Codes Collaborative (BECC)

    • business plan

    • P/T support

    • funding from NRCan

  • February 2007 CCBFC meeting

    • “Moved by …, seconded by …, that the updating of the MNECB as a progeny document based on the BECC business plan be approved, subject to:

      • the process to develop the document would follow the policies and procedures of the Commission

      • the work would not compromise the capacity to complete the current and ongoing priorities of the coordinated codes development system”


Necb 2011

NECB 2011

  • Standing Committee on Energy Efficiency in Buildings (SC-EEB) formed in 2007

  • First meeting in December 2007

  • Task groups

    • Building Envelope

    • HVAC and Service Water Heating

    • Lighting and Power

    • Performance Compliance

    • Code Consolidation


Necb 20111

NECB 2011

  • Objective-based

  • Energy used by the building

  • Paths of compliance

    • Prescriptive path

    • Trade-off path (within the Part)

    • Performance path

  • Simple payback approach


Task group on building envelope

Task Group on Building Envelope

  • Maximum overall thermal transmittances (U-values) will not differ for different assembly construction

  • Thermal requirements categorized by climate zone, defined by heating degree days – six Canadian climate zones

  • Thermal requirements will be fuel source neutral

  • Limitation on the fenestration and door to wall ratio in the prescriptive path

  • Air barrier requirements are being introduced for building envelope assemblies


Task group on building envelope cont d

Task Group on Building Envelope (cont’d)

Existing Provisions

Table A-3.3.1.1.(1)

Prescriptive Requirements – Above-ground Building Assemblies

Forming Part of Sentence 3.3.1.1.(1)


Task group on building envelope cont d1

Task Group on Building Envelope (cont’d)

Proposed Approach

Table 1. Proposed Thermal Requirements for the NECB 2011

Notes to Table 1:

1– floors in contact with the ground with imbedded heating cables or heating or cooling pipes require full area insulation in all heating-degree day categories

2 - exception of overall thermal transmittance of 3.4 W/m2K for skylights not exceeding 2% of gross roof area

3 - exception of overall thermal transmittance of 4.4 W/m2K for doors not exceeding 2% of gross wall area


Task group on building envelope cont d2

Task Group on Building Envelope (cont’d)

  • The maximum allowable total vertical fenestration and door area to gross wall area (FDWR) will vary by climate zone:

  • FDWR = 0.40 for HDD < 4000FDWR ≤ (2.590 X 10-8)∙HDD2 – (3.516 X 10-4)∙HDD + 1.392, for 4000 ≤ HDD ≤ 7000FDWR = 0.20 for HDD > 7000


Task group on building envelope cont d3

Task Group on Building Envelope (cont’d)


Task group on building envelope cont d4

Task Group on Building Envelope (cont’d)

  • Building envelope trade-off compliance path

    • Scaled down version of the full performance path, considering only building envelope elements

    • Demonstration that the building envelope will not use more energy than it would if all components were to comply with the prescriptive path


Task group on lighting and electrical power

Task Group on Lighting and Electrical Power

Lighting

  • Lighting requirements are generally being harmonized with ASHRAE 90.1 2010

  • Additional requirements for automatic control devices, including automatic daylighting controls

  • Lighting power allowances for building exteriors will be introduced for more exterior lighting applications


Task group on lighting and electrical power cont d

Task Group on Lighting and Electrical Power (cont’d)

Lighting (cont’d)

  • Lighting Power Density (LPD) tables updated

Lighting Power Densities

Using the Building Area Method

Building Area Type W/m2

Automotive facility9.79

Convention center11.30

Courthouse11.51

Dining: bar lounge/leisure10.87

Dining: cafeteria/fast food10.01

Dining: family10.11


Task group on lighting and electrical power cont d1

Task Group on Lighting and Electrical Power (cont’d)

Lighting (cont’d)

  • LPD tables updated

Lighting Power Densities Using the Building Method


Task group on lighting and electrical power cont d2

Task Group on Lighting and Electrical Power (cont’d)

Lighting (cont’d)

  • New lighting trade-off compliance path

    • for interior lighting only

    • quantify the impact of daylighting/daylight dependent and other controls

    • compare the overall lighting energy use of a building to a prescriptive baseline


Task group on lighting and electrical power cont d3

Task Group on Lighting and Electrical Power (cont’d)

Electrical Power

  • Few technical changes are proposed

  • New voltage drop requirements for feeder conductors and branch circuit conductors


Task group on hvac and service water heating

Task Group on HVAC and Service Water Heating

  • For prescriptive path, values for efficiency ratings, insulation thicknesses, etc., are being updated

  • New requirements

    • maximum temperature set points for vestibules

    • more requirements for when cooling is installed

    • more requirements for heat recovery systems


Task group on hvac and service water heating cont d

Task Group on HVAC and Service Water Heating (cont’d)

  • New HVAC and service water heating trade-off compliance paths that consider system efficiencies as opposed to individual component efficiencies – would include losses through the ducts and pipes


Task group on hvac and service water heating cont d1

Task Group on HVAC and Service Water Heating (cont’d)

Trade-off Path for HVAC (similar for SWH)

where

i - counter for number of components included, as per Article 5.3.2.2, for the given HVAC system

α1i - constant weighting factor to link the component efficiency variations of component i to system efficiency variations as per Article 5.2.3.10

α2i - first order weighting factor to link the component efficiency variations of component i to system efficiency variations as per Article 5.2.3.10

α3i - second order weighting factor to link the component efficiency variations of component i to system efficiency variations as per Article 5.2.3.10

ToVi - Specified value of component i for the proposed building as per Article 5.3.2.5

BaVi - Base value specified for component i the reference building as per Article 5.3.2.6


Task group on building performance compliance

Task Group on Building Performance Compliance

  • Contents of the supplement “Performance Compliance for Buildings” is being shifted to either the Code, the explanatory appendix to the Code, or a proposed users guide

    • Criteria/systems that are in the proposed building will be included in the reference building (e.g., cooling)

  • The goal is to base compliance on building energy targets – for a subsequent version of the NECB


Necb 20112

NECB 2011

  • Public review of the proposed changes will take place in the fall of 2010

    www.nationalcodes.ca


Necb 20113

NECB 2011

Questions?


Update of the national energy code for buildings

www.nrc-cnrc.gc.ca/irc


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