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 Development Robert Baker Permitting License Assistant Chief Inspector and Inspection Green Buildings Kevin Ramlu Ajeen Surendran Sarah Maleska Green Buildings Manager Buildings Energy Specialist Technical Assistant
AGENDA • Update from Township • Live Polling • Heat Pump Best Practices • Air Barriers and Step Code • Closing
PART 9 – Section F of Compliance Form • TOL is now requiring Section F on P9 compliance form to be filled • Help us track GHG’s and other metrics relevant to our goals • Helps inform policy development • Modeler has data
Part 3 - Part 3 Energy Design Report • New provincial form • Simplifies data submission and review • Clarifies mixed use reporting • Reach out for any questions
Free Heat Pump/Forced Air Training • Retrofit heat pump/forced air installation training • Comprehensive training • FREE for contractors • On-demand/online • This will be a PRC requirement in the future • Unsure if free in the 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
A little history Adopted the Solar Hot Water Ready 2011: Regulation 2014 - 2017: Offered builders the voluntary Green Building Rebate Program Industry stakeholder consultation sessions and 2018: workshops to strategize ESC adoption Adoption of use of Energy Step Code 2019: for new residential construction projects
Onwards and upwards 2020: • Assembled Green Buildings Team • Committed sizeable funding to CleanBC retrofit program • UBC Scholar conducted study on Part 3 non-res Step Code adoption • Monitoring Step Code results Industry consultation for Part 3 non-residential 2021: Step Code adoption
Step Code for Residential Buildings • 2021 • GHG DPA - Step 3 is required • NON-GHG DPA - Step 2 is compliant • 2022 • GHG DPA – Step 3 is required • NON-GHG DPA – Step 3 is required • 2022 – onwards • Tracked results will inform future adoption
Green Building Rebate Program – New Construction • Township of Langley is a pioneer with GBRP • GBRP supports going above and beyond
Township + CleanBC Incentives - Retrofit • TOL + CleanBC have teamed up • TOL topping up • CleanBC DOUBLE rebate until Dec. 31 st • See CleanBC or TOL website for details
Green Buildings Energy Specialist New team member: • Ajeen Surendran • Building Permit application reviews • Models • Drawings • Compliance • Support for building community • Answer questions etc • asurendran@tol.ca
Polling time! • Any internet connected device can be used for voting (if you don’t have two screens, you may find voting on your phone more convenient) • Go to menti.com and enter the code on the top bar of the next screen to vote • Cast your vote(s) and results will appear automatically on the screen *Polling code on next page
Today’s Speakers 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 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 construction. He specializes in practical solutions that make a house more efficient, safe and comfortable.
Heat Pumps Mikhael Horvath, P.Eng.
Seminar Outline Heat Pump Basics (the What) • Fundamentals • System Variants Heat Pumps + Step Code (the Why & When) • Re-cap of key Step Code metrics: TEDI, MEUI, etc. • The impact of heat pumps on Step Code metrics Load Calculations & Mechanical System Design (the How) • Owning the inputs Strengthening the Case for Heat Pump • Lessons from history – the pitfalls of over-promising and under-delivering • Do heat pumps really save owners money? (Footnote: you’re the Who, and wherever you are in BC can be the Where : -)
Heat Pump Fundamentals & Various Configurations
The Refrigeration Cycle Explained (Hopefully :-) 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. Ex. A heat pump that moves 12 kW of heat energy with an input of 4 kW has a COP of 3.
Air-Source Heat Pumps (ASHP)
Air-to-Air ASHP – Central Air • Many of the same components as a furnace except the heat ‘engine’ is the refrigerant based rather than a gas-fired heat exchanger • Very much like a furnace with AC • Operational limits vary widely with manufacturers • Pros: • Equipment is not visible • Ventilation is integral to system (HRV or not) • Easily coupled with backup heat • Cons: • Large duct distribution req’d (typ.) • Less readily zoned (typ.)
Air-to-Air ASHP – Ductless Split • Indoor fancoil unit located in each room or connected rooms (typ. wall mounted) • Operational limits & number of zones per system vary widely with manufacturer and model • Simultaneous heat/cool availability dependent on system type • Pros: • Intrinsically highly zoned • Cons: • Equipment is visible • Requires ventilation to be provided separately • Backup heat if provided is separate
Air-to-Air ASHP – Ducted Split • One indoor fancoil unit per zone – recessed in ceiling and ducted to one or more rooms • Operational limits & number of zones per system vary widely with manufacturer and model • Simultaneous heat/cool availability dependent on system type • Pros: • Intrinsically well zoned • Equipment is not visible • Cons: • Requires ventilation to be provided separately • Backup heat if provided is separate
Air-to-Water ASHP • HP unit in mechanical room supplies hydronic heating and cooling for distribution by various means • Operational limits vary widely with mfr. • Simultaneous heat/cool not available • Pros: • Lotsa options – forced air, in-floor, etc. • Highest efficiencies (COPs) • Equipment need not be visible • Easily coupled with backup heat, solar, etc. • Cons: • Less readily zoned (typ.) • Requires ventilation to be provided separately • Backup heat if provided is separate • Simultaneous heat/cool not available
Air-to-Water ASHP – Dedicated to DHW Heating Split DX – Most Any Climate Ducted Non-Ducted
Heat Pumps + the BC Energy Step Code
Step Code Performance Criteria
Performance Criteria – Envelope - TEDI
Performance Criteria – Systems - % < ERS Systems & Equipment Criteria – Option 1
Performance Criteria – Systems - MEUI Systems & Equipment Criteria – Option 2 (only option for Step 5)
MEUI wrt Mechanical Systems HVAC characteristics contributing to MEUI • Heating Efficiency (AFUE, EF, HSPF, COP) • Space Heating • Domestic Hot Water • Cooling Efficiency (EER/SEER, COP) • Distribution energy • Furnace fan energy • HRV fan energy • Pumping energy • AC unit fan energy • Domestic Hot Water Heating Energy
Step Code Performance Criteria - Recap
Load Calculations & Mechanical Design “If you fail to plan, you are planning to fail.” ~ Benjamin Franklin
Critical: Heating & Cooling Load Calculations
You Own the Inputs (Garbage In = Garbage Out) • Contractor is Responsible for carrying out load calculations properly BUT • You, the builder are responsible for ensuring the contractor is basing them on the correct inputs • Key parameters: • Building envelope assemblies (no brainer) • Accurate window data <- very important • Intentional ACH assumption <- very important • ‘Conservative assumptions’ are not appropriate for high performance buildings and will lead to over-sizing of equipment (and its subsequent myriad of issues) • You don’t need to be able to do the calculations but you need to be able to verify they are based on the correct inputs
Load Calcs ≠ Mechanical Design In Theory: • Rather, load calcs are one of the first steps in mechanical Theory = Practice design process • Load calcs + competent installer ≈ mechanical design In Practice: • Mechanical design = load calcs + installation plan Theory ≠ Practice
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