BUILDER FORUM SERIES: Heat Pumps Best Practices Air Barriers and - - PowerPoint PPT Presentation
BUILDER FORUM SERIES: Heat Pumps Best Practices Air Barriers and Step Code Presented by: Township of Langley Green Buildings Team Mikhael Horvath Enforma Engineering Inc Einar Halbig E3Ecogroup Green Buildings Team Community
Presented by: Township of Langley Green Buildings Team Mikhael Horvath – Enforma Engineering Inc Einar Halbig – E3Ecogroup
Kevin Ramlu Green Buildings Manager Sarah Maleska Technical Assistant Robert Baker Assistant Chief Inspector Ajeen Surendran Buildings Energy Specialist
Permitting License and Inspection Community Development Green Buildings
AGENDA
F on P9 compliance form to be filled
metrics relevant to our goals
development
submission and review
reporting
questions
training
future
R E G I S T E R A T W W W . H O M E P E R F O R M A N C E T R A I N I N G . C A
2011:
Adopted the Solar Hot Water Ready Regulation
2014 - 2017: Offered builders the voluntary Green
Building Rebate Program
2018:
Industry stakeholder consultation sessions and workshops to strategize ESC adoption
2019:
Adoption of use of Energy Step Code for new residential construction projects
2021:
Industry consultation for Part 3 non-residential Step Code adoption
2020: •
Assembled Green Buildings Team
retrofit program
non-res Step Code adoption
compliant
required
adoption
teamed up
rebate until Dec. 31st
website for details
New team member:
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*Polling code on next page
Einar Halbig – B.A.Sc., Energy Advisor, Managing Partner, E3 Eco Group Inc. Einar Halbig has over 25 years of education and experience in residential
efficient, safe and comfortable. Mikhael Horvath, P.Eng., LEED AP, IDL, Enforma Engineering Inc. Mikhael Horvath is a professional engineer and the president of Enforma Engineering Inc., which specializes in energy code compliance analysis and mechanical design for both Part 9 and Part 3 buildings. QUESTIONS IN CHAT BOX PLEASE
Mikhael Horvath, P.Eng.
Heat Pump Basics (the What)
Heat Pumps + Step Code (the Why & When)
Load Calculations & Mechanical System Design (the How)
Strengthening the Case for Heat Pump
(Footnote: you’re the Who, and wherever you are in BC can be the Where :-)
A heat pump is a device capable of moving heat energy in either of two directions. It can move heat from an external source into the controlled environment (heating – see image right) It can move heat out of the external environment into an external heat sink (cooling) NB: the ratio of heat energy moved to energy input is called the Coefficient of Performance.
energy with an input of 4 kW has a COP of 3.
furnace except the heat ‘engine’ is the refrigerant based rather than a gas-fired heat exchanger
manufacturers
(HRV or not)
per system vary widely with manufacturer and model
dependent on system type
separately
in ceiling and ducted to one or more rooms
system vary widely with manufacturer and model
dependent on system type
separately
heating and cooling for distribution by various means
separately
Split DX – Most Any Climate
Ducted Non-Ducted
Systems & Equipment Criteria – Option 1
Systems & Equipment Criteria – Option 2 (only option for Step 5)
HVAC characteristics contributing to MEUI
“If you fail to plan, you are planning to fail.”
~ Benjamin Franklin
calculations properly BUT
contractor is basing them on the correct inputs
important
for high performance buildings and will lead to
myriad of issues)
but you need to be able to verify they are based
In Theory: Theory = Practice In Practice: Theory ≠ Practice
design process
contractors to provide competitive bids with assurance of apples:apples comparison, and enhanced clarity concerning what scope of work.
sorted out beforehand rather than on site – no more surprise bulkheads!
being based on what’s right for the project rather than what may have been done previously or what is most
City of Richmond Step Code Project Approval Process
#3
Understand WHAT heat pump options are available and WHY it is an appropriate choice for your project. Put yourself in a position to answer the following questions:
efficiency targets of the project – MEUI, EnerGuide, etc.?
best achieves the comfort and cost criteria of the client?
#2
Understand HOW heat pumps (or at least the one you’re considering) perform with regards to energy efficiency,
position to answer the following questions:
it work?
temps, simultaneous heat/cool, etc.)
inverse relationship)
#1
PLAN to succeed:
design.
Understanding WHY and HOW will put you in a good position to evaluate.
track record AND will have available technical/maintenance support moving forward.
Einar Halbig
Managing Partner | E3 Eco Group Inc
member
Director & Founding Member
Agenda:
1) Why airtight? 2) Basic premise of air barrier systems 3) Some different air barrier systems 4) Roles and responsibilities 5) Best practices 6) Discussion.
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1) Recognize that Step Code requires airtightness testing, and there are levels of airtightness which MUST be met 2) Have a plan from the start: which air barrier system to use and how best to implement the details 3) Share knowledge with your Trades and collaborate 4) Have your Energy Advisor perform mid-construction testing to check your progress.
Key Take Aways: “Airtight On Purpose”
BC Energy Step Code- Moving to Net Zero Ready by 2032
Performance Compliance: Langley
Municipal Requirements
Township of Langley 2021: Step 2, or 3 if in DPA BC expected to require Step 3 end of 2021
(2.5ACH@50Pa)
Likely Step 4 by end of 2026 (1.5ACH@50Pa) Step 5 by 2032 (1.0 ACH@50Pa) What is your plan to adapt?
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1) Typical local houses around 3.5ACH@50Pa 2) Typical rowhouse units around 4.0ACH@50Pa 3) Reminder: Step Code 2 requires 3.0ACH@50Pa, and Step 3 requires 2.5ACH@50Pa
How are we doing so far?
Surprised? What would we expect before mandatory testing?
Airtightness Testing:
Testing will determine compliance, NOT visual checks:
How to Control Air Flow (ie How to Pass your Test)?
combination of materials installed within a building envelope to control airflow in and out of a building.
as townhome buildings, it also controls airflow between adjacent units.
Airtightness Testing of Rowhouse Units
Each unit will be tested for airtightness. Air leakage through the boundary of each unit gets measured: envelope and party walls.
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do mid-construction test
details are you?
airtightness targets
lower (tighter) over the years.
When to Test
Requirements of an Air Barrier System
Impermeable to air flow Continuous over the entire building
enclosure
Supported Able to withstand the forces that may
act on them during and after construction
Durable over the expected lifetime of
the building.
Source: BC Energy Step Code Builder Guide Air Barrier Components
Air barrier continuity is achieved through good details and the use of a variety of compatible components and sealants.
What are the Air Barrier Components:
What are the Air Barrier Components:
What are the Air Barrier Components:
What are the Air Barrier Components:
Air Barrier Systems (some):
barrier
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1) There is no single “Air Barrier Trade” 2) Portions of the air barrier are installed by different Trades 3) Trades need good drawing details to follow, and good site instruction 4) Trades people can unwittingly damage the air barrier 5) Easy to miss problems during visual checks 6) But still need to meet the airtightness target.
Challenges of Air Barrier Systems:
Integrated Design Process (IPD)- Apply it to Air Barrier Systems
“It takes a high performance design process to deliver an affordable, comfortable, healthy, sustainable, efficient high performance building.”
Roles and Responsibilities:
Architect: drawing details showing air barrier materials Envelope Engineer: reviewing drawing details, addressing
questions, checking work on site of exterior envelope
Site Superintendent/Air Boss: checking work on site,
getting questions to Architect or Envelope Engineer
Trades: knowing how your role affects the air barrier
system for this particular building; asking questions if not sure
Energy Advisor: testing the mid-construction and final
results.
Better Details:
Air barrier
materials shown and labelled
Air barrier
system shown.
Need a Plan for Continuous Air Barrier System:
Need a Plan for Continuous Air Barrier System:
Common Deficiencies in Air Barriers
Each Trade plays a crucial part in creating and maintaining the building’s air barrier.
Resources to Help and Learn More:
Township of Langley funding for mid construction
testing
CHBA BC “Building Science for New Homes” course BCIT courses BC Housing Guidelines
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Mid-Construction Airtightness Testing:
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Engage your EA During Construction:
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Engage your EA During Construction:
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Engage your EA During Construction:
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Case Study House:
Measured 1.8ACH@50Pa = 65 sq inch hole
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Only one level of rim joist NO HVAC ducts in attic/outside air barrier Master bedroom floor (over garage) spray foamed NO regular potlights with cans No basement Simple geometry.
What Makes This House Tight:
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1) Recognize that Step Code requires airtightness testing, and there are levels of airtightness which MUST be met 2) Have a plan from the start: which air barrier system to use and how best to implement the details 3) Share knowledge with your Trades and collaborate 4) Have your Energy Advisor perform mid-construction testing to check your progress.
Key Take Aways: “Airtight On Purpose”
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Questions? Thank you.
facilitating achievement of Upper Steps of the BC Energy Step Code
limits of heat pumps
past, leading to both disappointment and a lack of trust in equipment
reliable technical support when needed are key to a good installations and happy home owners
there are levels of airtightness which MUST be met
how best to implement the details
check your progress
registration/sign-in today acts as your proof
LUs
The Builder Forum Series is an ongoing program
Next session planned for early 2021
Greenbuildings@tol.ca