What is in the OBC SB-10 Update? The Ontario Architects Association Perspective Ontario Gets Serious about Energy Use in New Buildings 1 Introduction OBC Introduced SB-10 in 2007 Prescribed minimum energy performance MNECB-1997 + ASHRAE 90.1-2004 Update published in July 2011, effective Jan 2012 Implementation of ASHRAE 90.1-2010 + ASHRAE 189.1-2009 envelope values Three methods of compliance Performance (3 baselines in performance) Prescriptive + envelope trade-off Prescriptive Today will focus on prescriptive path 2 OBC Compliance Paths Today’s Focus OBC Compliance 90.1 Prescriptive + Chapter 2 90.1-2010 + Chapter 2 90.1 + Chapter 2 Mandatories 25% Less than MNECB MNECB Mandatories Energy Modeling against MNECB prescriptive 90.1 Mandatories Energy modeling against 90.1 prescriptive 5% Less than 90.1 2010 10 Energy modeling against 90.1 + Chapter 2 prescriptive ASHRAE 90.1-2010 / SB-10 Prescriptive Path Outlines minimum performance parameters for: Wall, Roofs, Windows elements etc. 11 Prescriptive and performance paths for insulation Weighted U-value allowed for some trade-offs within element type Envelope Trade-off calculations required for trade-offs across element types Maximum fenestration-to-wall ratio 40% Installed lighting power density Receptacle requirements Labeling (insulation, fenestration) HVAC plant minimum performance requirements (boilers, chillers) HVAC distribution performance requirements (fans, pumps) etc 90.1 Adoption as Building Code Most widely adopted building energy standard in North America British Columbia Vancouver 90.1-2004 90.1-2007 Ontario 12 90.1-2010 + 189.1-2009 envelope 90.1 History of Energy Improvements 13 Energy Use of All Buildings – By Age of Construction Zero energy buildings by year 3300 Total Energy Intensity (ekWh/m²) 500 400 300 200 100 0 Before 1920 1920-1959 1960-1969 1970-1979 1980-1989 Year building was contructed 1990-1999 2000-2004 Ref: Commercial and Institutional Building Energy Use, NRCAN 2005 14 90.1-2010 Section 3 Definitions, Abbreviations and Acronyms OK sounds boring… BUT How to interpret RATED R-VALUE How to interpret SPANDREL How to interpret METAL ROOF How to interpret ADOPTING AUTHORITY How to interpret BASELINE BUILDING DESIGN How to interpret ATTIC ROOF How to interpret SKYLIGHT How to interpret FENESTRATION AREA How to interpret F-FACTOR, U-FACTOR, C-FACTOR How to interpret CONTINUOUS INSULATION! AND LOTS OF OTHER STUFF! Read this section! (hint spandrel, U-factor, Continuous Insulation) 15 FYI: Spandrel sucks! 90.1-2010 Section 4 Administration and Enforcement Interpretations, claims of exemption and rights of appear are specified by the authority having jurisdiction Conflict with other laws, codes etc, to be determined by authority having jurisdiction Normative Appendices are considered a part of the standard Interpretations can be asked directly to ASHRAE 16 Informal or Formal 90.1 Section 5 90.1 Requirements SB-10 Revisions 17 90.1 – Air Barriers / Vestibules 5.4.3.1 Continuous Air Barrier Clearly identified or otherwise noted on construction documents for each assembly The joints, interconnections and penetrations shall be detailed or otherwise noted 5.4.3.1.A. Air Barrier Materials, Assemblies and Systems 18 (1) The air barrier materials, assemblies and systems that are in conformance with Part 5 of Division B of the Building Code shall be deemed to be in compliance with Sentence 5.4.3.1.3 and Sentence 5.4.3.2. 5.4.3.4 Shall have vestibules, exceptions: Building entrances with revolving doors Doors not intended to be a building entrance Doors opening directly from a dwelling unit Building is less than 90 m² Doors separate from the building entrance that open unto a space under 280 m² Division 3 Chapter 2 Revision Mandatories insulation details introduced from MNECB 1997 5.5.3.5.1 Slabs 19 5.5.3.5.2 Continuity of Insulation Div 3 Ch 2 Revision to 90.1 – Thermal Bridging Can be Ignored for…. 5.5.3.7/8 For the purposes of Section 5, the effects of thermal bridging are waived for: 20 continuous steel shelf angles (or similar structural element) used to support the building facade provided there is a thermal break structural connections of load bearing elements where a thermal break cannot be achieved exposed structural projections of buildings where the total crosssectional area of the exposed element does not exceed 2% ties in masonry construction, flashing, and top exposed portion of foundation walls provided the exposure does not exceed 200 mm 90.1 Section 5 Building Envelope Climate Definitions Climate Zone Definitions for Ontario Zone Number Thermal Criteria Zone 5 HDD18 < 4000 Zone 6 4000 < HDD18 < 5000 Zone 7 HDD18 > 5000 If space is electrically heated, then ALWAYS use Zone 7 21 90.1 Chapter 5 Space Conditioning Categories 90.1 Section 5.5 Comply with Tables (SB5.5-5 thru -7) Minimum RATED R-values of insulation Maximum U-Factor, CFactor or F-Factor Appendix A tables Appendix A9 calculations 22 2-D calculations (e.g. Therm) 90.1 Chapter 5 How to Use Envelope Tables Determine Climate Zone 5, 6 or 7 Determine space conditioning category Determine envelope category Roof 23 Insulation above deck Metal Building Attic & other Walls above grade Non-Residential Residential Semi-heated Mass Metal Building Steel-framed Wood-framed & other Etc. Today’s examples will be: Climate Zone 6 Non-Residential 90.1 Chapter 5 – Building Envelope Requirements Climate Zone 5 (SB-10 revisions) 24 90.1 Section 5 – Above Grade Wall Requirements (SB-10 revisions) Steel Framed Wall: Includes curtain-wall / window-wall spandrel panel 25 26 ASHRAE Appendix A Steel-Frame Walls 27 ASHRAE Appendix A Assembly U/C/F-Factor Look-up Tables Roofs A2.2 Roofs with Insulation Entirely Above Deck A2.3 Metal Building Roofs A2.4 Attic Roofs with Wood Joists A2.4.2 Single Rafter Roofs A2.5 Attic Roofs with Steel Joists Walls A3.1A Above-Grade Concrete Walls and Masonry Walls 28 A3.1B U-Factors, C-Factors, Ru, Rc and HC for Concrete A3.1C U-Factors, C-Factors, Ru, Rc and HC for Concrete Block Walls A3.1D Effective R-Values for Insulation/Framing Layers Added to Above/Below Grade Mass Wall A3.2 Metal Building Walls A3.3 Steel-Frame Walls A3.4 Wood-Frame Walls A4.2 Below Grade Walls Exposed Floors A5.2 Mass Floors A5.3 Steel Joist Floors A5.4 Wood Joist Floors Slab on Grade Floors A6.3 Slab on Grade Floors Metal Cladding with Z-Girts 29 13 mm drywall 102 mm steel stud @ 400 mm oc 13 mm exterior sheathing 102 mm z-girt @ 600 mm oc with semirigid Metal siding Metal Cladding with Z-Girts Nominal R-15 Actual R-8.6 30 OBC Requirement: U-0.055 BTU/hr-ft²-°F Assembly: U-0.116 BTU/hr-ft²-°F Metal Cladding with Orthogonal Z-Girts and Spray Foam 31 13 mm drywall 102 mm steel stud @ 400 mm oc 13 mm exterior sheathing 51 mm z-girt @ 600 mm oc with spray foam 51 mm z-girt @ 600 mm oc with spray foam Metal siding Metal Cladding with X Z-Girts and Spray Foam Nominal R-24 Actual R-21 32 OBC Requirement: U-0.055 BTU/hr-ft²-°F Assembly: U-0.048 BTU/hr-ft²-°F Spandrel ?? Nominal R-14 Actual R-4.0 33 OBC Requirement: U-0.055 BTU/hr-ft²-°F Assembly: U-0.250 BTU/hr-ft²-°F Spandrel will be challenging (condensation?) With 1” XPS interior insulation Nominal R-19 Actual R-9.1 OBC Requirement: U-0.055 BTU/hr-ft²-°F Assembly: U-0.11 BTU/hr-ft²-°F With 2” XPS interior insulation Nominal R-24 Actual R-14.2 OBC Requirement: U-0.055 BTU/hr-ft²-°F Assembly: U-0.070 BTU/hr-ft²-°F 34 90.1 Section 5 – Maximum Fenestration Area 5.5.4.2.1 Vertical Fenestration Area 35 The total vertical fenestration area shall be less than 40% of the gross wall area Perhaps this is the reason why? R3 R2 Modern R4 Old 36 Glass and the Walls they’re in… - John Straube 37 90.1 Section 5 Fenestration Orientation 5.5.4.5 Fenestration Orientation “South” Fenestration Area must greater or equal to “west” and “east” Exceptions for nearly any site restrictions 38 As ≥ Aw and As ≥ Ae Topography, adjacent structures within 6 meters Exceptions for 5.5.4.4.1 (street side fenestration) 90.1 Section 5 – Fenestration Requirements (SB-10 revisions) 39 Window heat loss Flanking (and installation) Frame Edge of Glass Centre of Glass 40 Curtain Wall Plan View glazing system U-value 90.1 Section 5 – Determining Fenestration Performance 5.8.2 Vertical Fenestration U-Factors & SHGC shall be determined in accordance with: 41 Standard NRFC 100 or CSA-A440.2 or 90.1-2010 Table A8.2 – not recommended! 90.1 Section 5 – Determining Fenestration Performance FramePlus Online Can be used for estimating whole window performance Not for compliance! http://tools.enermodal.com /webframeplus 42 FramePlus Online Curtain-Wall Performance Curtain Wall System U-values [BTU/ft²-hr-°F] 0.50 Fenestration System U-value 0.45 0.40 Climate Zone 5 & 6 0.35 0.30 Climate Zone 7 0.25 0.20 Dbl SB60 Argon 0.15 Tpl SB60 Argon 0.10 0.05 0.00 0 43 2 4 6 8 10 12 14 Curtain Wall Frame Thermal Break Size in mm 16 18 20 FramePlus Online Punched Alum Window Performance Punched Aluminum Window U-values [BTU/ft²-hr-°F] 0.50 Climate Zone 5 & 6 Fenestration System U-value 0.45 0.40 Climate Zone 7 0.35 0.30 0.25 0.20 Dbl SB60 Argon 0.15 Tpl SB60 Argon 0.10 0.05 0.00 0 2 4 6 8 10 12 14 Aluminum Frame Thermal Break Size in mm 44 16 18 20 FramePlus Online Casement/Awning Alum Window Performance Casement/Awning Aluminum Window U-values [BTU/ft²-hr-°F] Fenestration System U-value 0.60 0.50 Climate Zone 5 & 6 0.40 Climate Zone 7 0.30 Dbl SB60 Argon 0.20 Tpl SB60 Argon 0.10 0.00 0 1 2 3 4 5 6 7 Aluminum Frame Thermal Break Size in mm 45 8 9 10 90.1 Section 5 Envelope Trade-Offs within Prescriptive Path – Area Weighted Area weighted U / C / F factors within Class of construction and Space conditioning category Can trade off: Steel Framed / Non-Residential Walls with Attic / Non-Residential Roof with Attic / Non-Residential Roof Metal Framing Vertical Fenestration Residential with 46 Steel Framed / Non-Residential Walls Metal Framing Vertical Fenestration Residential Complying with Prescriptive Envelope: Area Weighted U-Factor Gross Walls W1 Spandrel W2 Steel Frame Window 160,800 50,700 50,700 59,400 U-Factor 31.5% 0.154 31.5% 0.055 37.0% Uavg 0.104 Ravg 9.576 Reff 6.5 18.2 Gross Walls W1 Spandrel W2 Steel Frame Window 160,800 50,700 50,700 59,400 U-Factor 0.154 31.5% 31.5% 0 37.0% Uavg 0.077 Ravg 13.000 Reff 6.5 Infinite! Gross Walls W1 Spandrel W2 Steel Frame Window 160,800 25,300 76,100 59,400 U-Factor 15.7% 0.154 47.3% 0.022 37.0% Uavg 0.055 Ravg 18.195 Reff 6.5 45.5 U-Factor Target for Steel Frames Walls: 0.055 47 Envelope Trade-Offs within Prescriptive Path – Building Envelope Trade-off 90.1 Section 5.6 comply with: 5.1General 5.4 Mandatories 5.7 Submittals 5.8 Product information and installation requirements the envelope performance factor is less than or equal to budget building Appendix C calculations Software Tool: ComCheck 48 Do not try this at home! OBC version being developed ComCheck Software (Version 3.9.1 Shown) OBC Version being developed Exceeding 60% fenestration will still be a challenge with only envelope trade-offs 49 Complying with Prescriptive Envelope: Building Envelope Trade-Off: Wall Insulation Gross Walls W1 Spandrel W2 Steel Frame Window 160,800 50,700 50,700 59,400 31.5% 31.5% 37.0% U-Factor 0.154 0.055 Reff 6.5 18.2 -7% below code Gross Walls W1 Spandrel W2 Steel Frame Window 160,800 50,700 50,700 59,400 31.5% 31.5% 37.0% U-Factor 0.154 0 Reff 6.5 Infinite! -2% below code Gross Walls W1 Spandrel W2 Steel Frame Window 160,800 25,350 76,050 59,400 15.7% 47.3% 37.0% U-Factor 0.154 0.036 Reff 6.5 28 +0.1% above code Gross Walls W1 Spandrel W2 Steel Frame Window 50 160,800 33,800 67,600 59,400 21.0% 42% 37.0% U-Factor 0.154 0.022 +0.1% above code Reff 6.5 45.5 Complying with Prescriptive Envelope: Building Envelope Trade-Off: Walls and Punched Window Envelope W1 Steel Frame Code Punched Window 160,800 80,400 80,400 U-Factor 50% 0.055 0.45 50% -5% below code Reff 18.2 Envelope W1 Steel Frame Code Punched Window 160,800 80,400 80,400 U-Factor 50% 0.011 0.45 50% +0.1% above code Reff 91 Envelope W1 Steel Frame Hi-Perf Double Punched Window 160,800 56,250 35% 104,550 65% Envelope W1 Spandrel Super Windows (3pl) 51 160,800 8,000 153,000 U-Factor 0.055 Reff 18.2 0.32 +0.1% above code U-Factor 5% 0.154 95% 0.22 +2% above code Reff 6.5 Building Envelope Compliance Summary FWR Prescriptive Weighted U-Value / SHGC Envelope Trade-Off Whole Building Energy Model ≤40% ≤40% ≤40% in baseline ≤40% in baseline Compared to Tables SB5.5-5 thru -7 Compared to Tables SB5.5-5 thru -7 and HVAC / Electrical prescriptive targets Fenestration Tables SB5.5-5 thru -7 Walls Roof 52 and within same Tables SB5.5-5 thru -7 assembly type and conditioned space 90.1 Section 6: 90.1 Requirements SB-10 Revisions 53 Mostly just Canadian Standards HVAC Section 6 Heating/Cooling Peformance Mandatory 54 Minimum Equipment Efficiencies Tables 6.8.1 A-K Equipment not regulated by NAECA shall have permanent label stating compliance with 90.1 Equipment Air Conditioners Heat Pumps Minimum Efficiency COP 3.2 – 3.8 COPc >3.2 COPh > 2.2 Chillers Air Cooled COP IPLV > 3.6 Reciprocating COP IPLV > 5.6 Centrifugal COP IPLV > 5.9 Furnaces > 78% AFUE or > 80% thermal efficiency Boilers Heat Rejection under 88 kW / 300 MBH 80% Over 733 kW / 2500 MBH 82% Axial Fan Open-circuit >3.23 L/(s-kW) Centrifugal Fan Open-circuit >1.7 L/(s-kW) Axial Fan Closed-circuit >1.7 L/(s-kW) Centrifugal Fan Closed-circuit 0.59 L/(s-kW) 90.1 Section 6 – Variable Fan/Pump Control 6.5.3.2.1 All Fan motors > 7.4 kW / 10 hp shall have one of: Variable speed drive Variable pitch blades (axial fans) Other controls capable of achieving 30% energy consumption at 50% design flow 6.5.4.1 Systems having a total pump system power greater than 7.5 kW / 10 hp shall be variable speed 55 Differential pressure transducer located where greatest pressure difference will occur 90.1 Section 6 – Exhaust Air Heat Recovery 50% energy recovery required for most multizone systems Exempt if 56 the largest single source of exhaust is less than 75% of O/A rate More than 60% of outdoor air heating from site solar or site recovered energy Operates less than 20 hr/week % Outdoor Air at Full Design Airflow Rate Design Supply Air Flow Rate ≥ 30% and < 40% > 2596 L/s > 5500 CFM ≥ 40% and < 50% > 2124 L/s > 4500 CFM ≥ 50% and < 60% > 1652 L/s > 3500 CFM ≥ 60% and < 70% > 944 L/s > 2000 CFM ≥ 70% and < 80% > 472 L/s > 1000 CFM >0 >0 > 80% 90.1 Section 7 90.1 Requirements SB-10 Revisions Canadian Standards 7.4.5.2 Heated exterior public pools and public spas shall be equipped with a pool cover 57 Unless 60% of their annual heating from site-recovered or solar sources 90.1 Section 8 8.4.2 Automatic Receptacle Control For private offices, open office and computer classrooms 50% of receptacles shall have either 58 Occupancy sensors On a schedule to turn off during unoccupied hours Any other means to ensure power is turned off during unoccupied hours Exceptions where it can be shown that equipment needs to be on continuously 90.1 Section 9 Occupant sensor or timer switch shall be used in: Classrooms and lecture halls Conference, meeting and training rooms Employee lunch and break rooms Storage and supply rooms (15 to 305 m²) Rooms used for document copying and printing Office spaces up to 76 m² Restrooms Dressing, locker and fitting rooms Exception for space 59 With multi-scene control Shop and laboratory classrooms where automatic lights would endanger safety or security 24-hour operation spaces 90.1 Section 9 Lighting Power Density Table 9.5.1 LPD using Building Area Method Building Area Type Automotive facility Convention centre Courthouse Dining: bar lounge/leisure Dining: cafeteria/fast food Dining: family Dormitory Exercise centre Fire station Gymnasium Health-care clinic Hospital Hotel Library Manufacturing facility Motel 60 ASHRAE 90.1 2007 2010 W/m2 W/m2 10 8.8 13 11.6 13 11.3 14 10.7 15 9.7 17 9.6 11 6.6 11 9.5 N/A 7.6 12 10.8 11 9.4 13 13 11 10.8 14 12.7 14 11.9 11 9.5 Reduction 12% 11% 13% 24% 35% 44% 40% 14% N/A 10% 15% 0% 2% 9% 15% 14% Table 9.5.1 LPD using Building Area Method Building Area Type Motion picture theatre Multifamily Museum Office Parking garage Penitentiary Performing arts theatre Police/fire station Post office Religious builidng Retail School/university Sports arena Town hall Transportation Warehouse Workshop 61 ASHRAE 90.1 2007 W/m2 13 8 12 11 3 11 17 11 12 14 16 13 12 12 11 9 15 2010 Reduction W/m2 8.9 32% 6.5 19% 11.4 5% 9.7 12% 2.7 10% 10.4 5% 15 12% 10.3 6% 9.4 22% 11.3 19% 15.1 6% 10.7 18% 8.4 30% 9.9 18% 8.3 25% 7.1 21% 2.9 81% Average reduction in LPD 19% What about Division 4? Division 4 of SB 10: 62 if the building is within the scope of Part 9 Div B of the OBC and, does not contain a residential occupancy, and does not use electric space heating, and, is intended for occupancy on a continuing basis during the winter months i.e. most Non-Residential Part 9 buildings Division 4 Building Envelope Largely the same as the SB5-5 Tables of Division 3 Fewer climate zone, space categories, envelope types If Vertical fenestration gross area exceeds 40% or Skylights exceed 5% 63 Use Division 3 paths (including trade-offs and energy modeling) SB-10 Division 4 – Building Envelope Requirements 64 SB-10 Division 4 – HVAC Requirements Multi-zone systems Revert to Division 3 (90.1-2010 + SB10 Revisions) Single-zone systems Use Division 3 90.1-2010 equipment performance values Plus details on next slide…. (largely reminiscent of 90.1-2010) 65 SB-10 Division 4 Single Zone HVAC Details (4) An air-conditioning system with a cooling capacity of 40 kW or more shall have an economizer, (a) controlled by appropriate high limit shut-off control, and (b) equipped with either barometric or powered relief sized to prevent excess pressurization of the building. 66 (a) more than 1 400 L/s, and (b) more than 70% of the supply air quantity of the system. (7) Where a heat recovery ventilator is installed, the system shall have provisions to bypass or control the heat recovery ventilator to permit operation of the air economizer. (8) A heating, ventilating and air-conditioning system shall be controlled by a manual changeover or dual setpoint thermostat. (9) Except for a system requiring continuous operation, a heating, ventilating and airconditioning system that has a cooling or heating capacity greater than 4.4 kW and a supply fan motor rated for more than 0.5 kW shall be provided with a time clock that, (5) Outdoor air dampers for economizer use shall be provided with blade and jamb seals. (6) A heat recovery ventilator with a recovery effectiveness of 50% or more at the outside winter design temperature shall be provided where the quantity of the outdoor air supplied to the air duct distribution system is, (a) is capable of starting and stopping the system under different schedules for seven different daytypes per week, (b) is capable of retaining programming and time setting during a loss of power for a period of 10 hours or more, (c) includes an accessible manual override that allows temporary operation of the system for up to two hours, (d) is capable of temperature setback down to 13°C during off-hours, and (e) is capable of temperature setup to 32°C during off-hours. (10) Where separate heating and cooling equipment serves the same temperature zone, thermostats shall be interlocked to prevent simultaneous heating and cooling. (11) A heating, ventilating and air-conditioning system with a design supply air capacity greater than 5000 L/s shall have optimum start controls. SB-10 Division 4 – Lighting Requirements Largely taken from 90.1-2010 67 When should I expect an Energy Model to Demonstrate Compliance? Opaque wall assembly has lots of thermal bridging standard spandrel panel has very low insulating value z-girt walls steel frames walls without exterior insulation High amounts of glazing (>40%) Up to 65% with very best double glazed Up to 95% with triple glazed (super windows) Curtain wall and window wall buildings Likely Building Types 68 Condominiums Offices Performance Compliance Paths 25% less than MNECB 5% less than 90.1-2010 (without SB-10 revisions) Less than or equal to SB-10 (90.1-2010 + SB-10 revisions) Design must comply with mandatory requirements Reference complies with prescriptive requirements of: Overall building energy consumption 69 MNECB, 90.1-2010 or SB-10 proposed design vs. reference design regulated loads only 90.1-20XX Impact on the Market Product suppliers are paying attention 70 Closing Quotes Ludwig Wittgenstein (engineer, mathematician, philosopher) W.H. Auden (poet) “I don't know why we are here, but I'm pretty sure that it is not in order to enjoy ourselves.” “We are all here on earth to help others; what on earth the others are here for I don't know.” www.enermodal.com Kurt Vonnegut (writer) 71 "We are put on earth to fart around....don't let any one tell you any different." 72
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