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Update of the National Energy Code for Buildings.

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Presentation on theme: "Update of the National Energy Code for Buildings."— Presentation transcript:

1 Update of the National Energy Code for Buildings

2 2 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

3 3 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

4 4 History (cont’d)  Total life-cycle costing  Different construction requirements for different energy sources  Regional variations in energy costs  Not widely adopted

5 5 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.”

6 6 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”

7 7 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

8 8 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

9 9 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

10 10 Task Group on Building Envelope (cont’d) Existing Provisions Table A (1) Prescriptive Requirements – Above-ground Building Assemblies Forming Part of Sentence (1) Assembly Description Principal Heating Source Electricity, Other Oil, Propane, Heat Pump Natural Gas Maximum Overall Thermal Transmittance (U-value), W/m 2 ºC Roofs Type I - attic-type roofs Type II - parallel-chord trusses and joist-type roofs0.230 Type III - all other roofs (e.g., concrete decks with rigid insulation) Walls Floors Type I - parallel-chord trusses and joist-type floors Type II - all other floors (e.g., concrete slabs with rigid insulation)

11 11 Task Group on Building Envelope (cont’d) Proposed Approach Heating Degree-Days of Building Location(1), Celsius degree-days Zone 4: < 3000 Zone 5: 3000 to 3999 Zone 6: 4000 to 4999 Zone 7A: 5000 to 5999 Zone 7B: 6000 to 6999 Zone 8: ≥ to 7000 Maximum Overall Thermal Transmittance (W/m 2 K) In Contact With the Ground Walls Roofs Floors for 1.2 m full area Above-Ground Component Walls Roofs Floors Fenestration Doors 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/m 2 K for skylights not exceeding 2% of gross roof area 3 - exception of overall thermal transmittance of 4.4 W/m 2 K for doors not exceeding 2% of gross wall area

12 12 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 7000

13 13 Task Group on Building Envelope (cont’d)

14 14 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

15 15 Task Group on Lighting and Electrical Power Lighting  Lighting requirements are generally being harmonized with ASHRAE  Additional requirements for automatic control devices, including automatic daylighting controls  Lighting power allowances for building exteriors will be introduced for more exterior lighting applications

16 16 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/m 2 Automotive facility9.79 Convention center11.30 Courthouse11.51 Dining: bar lounge/leisure10.87 Dining: cafeteria/fast food10.01 Dining: family10.11

17 17 Task Group on Lighting and Electrical Power (cont’d) Lighting (cont’d)  LPD tables updated Lighting Power Densities Using the Building Method Building Type (1) Lighting Power Density (W/m 2 ) Automotive facility8.8 Convention centre11.6 Courthouse11.3 Dining: bar lounge/leisure10.7 Dining: cafeteria/fast food9.7 Dining: family9.6 Dormitory6.6 Exercise centre9.5 Fire station7.6 Gymnasium10.8 Health-care clinic9.4 Hospital13.0 ……

18 18 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

19 19 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

20 20 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

21 21 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

22 22 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 , for the given HVAC system α1 i - constant weighting factor to link the component efficiency variations of component i to system efficiency variations as per Article α2 i - first order weighting factor to link the component efficiency variations of component i to system efficiency variations as per Article α3 i - second order weighting factor to link the component efficiency variations of component i to system efficiency variations as per Article ToV i - Specified value of component i for the proposed building as per Article BaV i - Base value specified for component i the reference building as per Article

23 23 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

24 24 NECB 2011  Public review of the proposed changes will take place in the fall of 2010

25 25 NECB 2011 Questions?

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