navigating mecb building envelope requirements - …winnipeg.csc-dcc.ca/img/content/winnipeg...
TRANSCRIPT
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Navigating MECB Building Envelope
Requirements
Harry Schroeder Manitoba Hydro
December 9, 2015
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The Path to Energy Efficiency
Conviction
Compulsory Targets
Communication
Compliance
Cash
The cornerstone of a viable Energy Policy for Europe European Energy Efficiency Industrial Forum 2010
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Think about it…
No single raindrop believes itself responsible for the flood
I thought – why doesn’t someone do something? – then I realized I was someone
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Energy Code Documents
Province of Manitoba Amendments: http://web2.gov.mb.ca/laws/regs/current/_pdf-regs.php?reg=213/2013
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Energy Code Documents
Which Code Applies? (General Guideline*)
For any Part 3 Building → NECB
For Part 9 Buildings • C. (600 m2 or less) → Section 9.36 • C. (300m2) + {.D. + .E. + .F3.} (300m2 or less) → Section 9.36 • C. (any area) + {.D. + .E. + .F3.) (> 300m2) → NECB • {.D. + .E. + .F3.} (300m2 or less) → Section 9.36 • {.D. + .E. + .F3.} > 300m2 → NECB • F2. (any area) + {.C. + .D. + .E. + .F3.} (any area) → NECB
*confirm with your AHJ
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Prescriptive
Trade-Off
Simple Detailed
Performance
Compliance Options
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U value – Thermal Transmittance/CondUctivity
RSI – Thermal Resistance (SI/metric)
Rimp – Thermal Resistance (imperial)
R= U=
Usi = Uimp x 5.678 Rimp=Rsi x 5.678
Calculating Overall Thermal Transmittance (U-value)
1 U
1 R
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Effective vs Nominal
Wood vs Steel Stud
Metal Framing
Material properties resources
Assembly properties resources
ASHRAE Fundamentals Handbook(s)
Calculating Overall Thermal Transmittance (U-value)
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“R” is important
Calculating Overall Thermal Transmittance (U-value)
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Calculating Overall Thermal Transmittance (U-value)
+ air films
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Calculating Overall Thermal Transmittance (U-value)
Coming soon to a distributor near you . . . or not
U-0.28
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http://cwc.ca/resources/wall-thermal-design/search-go-to-the-calculator/
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Calculating Overall Thermal Transmittance (U-value)
This is not an R-20 wall!!
16 ply 2x6 column
16” header
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Calculating Overall Thermal Transmittance (U-value)
Taken from NECB User’s Guide 2014
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Calculating Overall Thermal Transmittance (U-value)
½” Exterior gwb 6” ss @ 16” o/c 6 ” glass fibre batt ½” gwb
Surface Temperature = 11.6 C Reffective = 10.3 Wall thickness = 7.0”
https://windows.lbl.gov/software/therm/therm.html
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"Steel studs are designed to provide the maximum possible conductive energy transfer across a wall using the minimum amount of material — a thin web with cleverly designed heat transfer fins (flanges) on both sides to efficiently absorb heat on one side and reject it on the other. [...] It is pointless to insulate the cavity to fight this efficiency of heat transfer."
-Joseph W. Lstiburek, Ph.D., in ASHRAE Journal
Calculating Overall Thermal Transmittance (U-value)
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Calculating Overall Thermal Transmittance (The “bigger” steel stud approach)
*The B.C. Experience
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Calculating Overall Thermal Transmittance (U-value)
3” XPS ½” exterior gwb 3 5/8” ss @ 16” o/c 3 ½ ” glass fibre batt ½” gwb
Surface Temperature = 18.2 C Reffective = 23.9 Wall thickness = 7.63”
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Calculating Overall Thermal Transmittance (U-value)
http://tc44.ashraetcs.org/research.html
ASHRAE RP 1365 - Thermal Performance of Building Envelope Details for
Mid‐ and High‐Rise Buildings (Final Report)
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Calculating Overall Thermal Transmittance (Climate Zones)
7A
7B
8
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Calculating Overall Thermal Transmittance (Opaque – Above Grade)
U 0.210 = R27 U 0.162 = R35
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In
Studs, joists, lintels, sill, plates
Sort of in
Columns/beams parallel to the envelope
Sort of out
Balcony slabs, beams/columns IF <2% of wall area
Out
Pipes, ducts, HVAC units, shelf angles, anchors, ties
Calculating Overall Thermal Transmittance (What’s in-What’s out)
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Calculating Overall Thermal Transmittance (What’s in-What’s out)
NECB Appendix A
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Expectation is for continuous insulation
Exception for structural members & switching insulation from interior to exterior -requires insulation for 4x the
intersecting distance
No exceptions for mechanical/electrical components
Calculating Overall Thermal Transmittance (What’s in-What’s out)
Figure taken from NBC 9.36 Appendix
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Calculating Overall Thermal Transmittance (What’s in-What’s out)
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Practical Design Details
http://www.bchydro.com/content/dam/BCHydro/customer-portal/documents/power-smart/builders-developers/final-mh-bc-part-1-envelope-guide.pdf
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Practical Design Details
With thanks to:
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Practical Design Details Girt Systems
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Calculating Overall Thermal Transmittance (U-value)
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Practical Design Details Cladding Systems
Engineered Assemblies Inc. Cascadia Clips
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Practical Design Details Connection Details
Fabreeka
Armatherm
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Practical Design Details Slabs/Balconies
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Practical Design Details Balconies
Balcony slab
Balcony support
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Practical Design Details Metal Buildings
U-Factor 0.27 SI U-Factor 0.048 imp R20.8 imp
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Practical Design Details Insulated Panel Systems
Image courtesy of METL-SPAN Image courtesy of Canadian Precast/Prestressed Concrete Institute
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Fenestration
2.0 2.0
MB Amendment
Currently no Solar Heat Gain (SHGC) requirements
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Fenestration
http://construct.ppg.com/
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Fenestration
COG= 0.18 (1.02) System=0.25 (1.42)
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Fenestration
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Fenestration Energy Star
http://oee.nrcan.gc.ca/pml-lmp/index.cfm?action=app.searchrecherche&appliance=WINDOWS
Fenestration
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Fenestration
National Fenestration Rating Council (NFRC)
http://search.nfrc.org/search/searchDefault.aspx
Fenestration
Requires conversion to SI
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Fenestration (FDWR)
FDWR ≤ (2000 – 0.2 x 5,670) / 3000 ≤ 0.29 or 29% (Winnipeg)
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Fenestration (FDWR)
We don’t want to go here!
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Fenestration – Curtain Wall
Spandrels
MB Amendment
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Fenestration – Curtain Wall
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Practical Design Details Some Good News!
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Practical Design Details Some Good News
Passive Solar Heat Gain
Good window selection can provide net energy gain
South exposure, Winnipeg
Up to 100 kWh/m2 net gain
Offset with solar shading
Static
Mechanical
Dynamic
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Practical Design Details Some Good News
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Practical Design Details Some Good News
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Doors
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Doors
National Fenestration Rating Council
http://search.nfrc.org/search/cpd/cpd_search_productline.aspx
Information primarily on residential style entry and garage doors
http://www.dasma.com/dasma-pages/DASMA-tehnical-data-sheets.asp
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Building Assemblies in Contact with the Ground
0.284 (R20) 0.757 (R7.5)
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Special Considerations
Grade beams above/below grade
Radiant floors
Slab on Grade -depth
Building Assemblies in Contact with the Ground
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Building Assemblies in Contact with the Ground
Manitoba amendment
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Building Assemblies in Contact with the Ground
Manitoba amendment
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Material properties in NBC
System properties in NBC & NECB
Windows & Doors
Walls/Roofs – not so much
No whole building air tightness requirement in NBC or NECB
Recommendation in the Appendix of NBC
Air Leakage
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Air Leakage
An Investigation of Airtightness in Manitoba’s Commercial Building Sector Red River College/Proskiw Engineering 2015
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Air Leakage
Some leaks are more obvious than others!
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∑ (summation) UxA (proposed) ≤ ∑ UxA (prescriptive)
Some exclusions
Example: (opaque wall area ≤ 0.21)
10% of wall area U=0.24 (R23.6)
40% of wall area U=0.23 (R24.7)
50% of wall area U=0.18 (R31.5)
Total U=0.206 (R27.6)
Simple Trade Off
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Building with 25% glazing
Prescriptive ∑ UxA
75% x 0.21 + 25% x 2.0 = 0.68
Proposed ∑ UxA
U value of opaque wall = 0.28 (R20)
75% x 0.28 + 25% x Uwindow ≤ 0.68
U window (max) = 1.88
Simple Trade Off (Fenestration/Opaque)
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Building with 40% glazing
Prescriptive ∑ UxA
71% x 0.21 + 29% x 2.0 = 0.73 (maximum FDWR)
Proposed ∑ UxA
U value of window= 1.4
60% x Uwall + 40% x 1.4 ≤ 0.73
U wall (max) = 0.28 (R20.0)
Simple Trade Off (Fenestration/Opaque)
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Reference building is still from prescriptive approach
Trade off between any envelope components
Proposed building must not use more energy than the prescriptive building
Complex calculations when considering above grade vs components in contact with the ground
Quickly leads to performance path with modeling
Detailed Trade Off
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Checklists
Taken from NECB User’s Guide 2014
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Checklists
http://www.firecomm.gov.mb.ca/codes_energy.html compliance checklist
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Still based on Prescriptive values
Unlimited trade-offs between components and systems
Design Flexibility
Case Studies- Sherwood Developments
Performance
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Additional Training
www.rrc.ca/techsolutions
CSC – January 20, 2016 Opportunities & Insights with Energy Modeling
Red River College Intro to the Manitoba Energy Code for Buildings
Section 9.36 Energy Efficiency in Housing and Small Buildings (sold out-waiting list)
Manitoba Energy Code Exams (MECB or Section 9.36)
Introduction to CANQUEST Modeling
Advanced CANQUEST Modeling
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Questions/Comments?
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DESIGN, BUILD, MARKET & MANAGE
The Waterfront
102 Units built in 2000
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DESIGN, BUILD, MARKET & MANAGE
The Excelsior
48 Units + 5 Commercial built in 2005
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DESIGN, BUILD, MARKET & MANAGE
The Renaissance
41 Units built in 2007
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SHERWOOD’S HISTORY
CEDARCREST CONSTRUCTION
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SHERWOOD’S HISTORY
CEDARCREST CONSTRUCTION
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OUR DESIGN
OUTPERFORMS THE INDUSTRY STANDARD
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THE ENCLAVE
PHASE1 162 UNITS
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NEW BUILDINGS PROGRAM
$2.00 per sqft incentive
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ENERGY MODELING
MIN. REQUIREMENT 33% BETTER THAN MNECB 1997
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MAKE UP AIR UNIT
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DESIGN TEAM MEETING
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AIR SOURCE HEAT PUMPS & HEX HOT WATER PRE-HEAT SYSTEMS
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ENERGY MODELING
Cost of Utilities Annual Savings For Each Device Capital Cost VS Operating Cost
Detailed Calculations Provided
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HEX - DOMESTIC HOT WATER PRE-HEAT SYSTEM
Enclave phase1 built 45% better than MNECB 1997
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ENCLAVE PH. 5 UNDERWAY
Enclave phase 5 designed 24% better than current MECB
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PERFORMANCE PATH BENEFITS
Window to gross wall ratio would fail
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TYPICAL WALL TYPE
EFFECTIVE VS NOMINAL R-VALUE
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ENERGY CODE INCREASES VALUE OF BUILDINGS
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Informed buyers & renters follow the news
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