Alberta Building Envelope Council South


ABEC November Luncheon


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Date(s) - 27/11/2019
11:30 am - 1:30 pm

The Winston Golf Club


Topic: Mechanical System and Building Envelope Working Together for Better Buildings

Participants will learn to understanding how mechanical systems affect and are affected by the building envelope. Building pressures differences, temperature gradients, comfort, condensation, moisture, thermal bridging, sizing and energy efficiency.

The presentation will investigate and gain a more complete understanding of the importance of the building envelope and its impact on equipment selection and equipment sizing.

Some of the items discussed will be:

  • What causes pressure differences within a building?
  • Methods to measure the pressure differences
  • Indoor air conditions (humidity levels and other air contaminants). What affects these and how can mechanical systems be used to manage them or just gain a better understanding of the interaction between the mechanical systems and the building envelope.

When talking about mechanical systems, I will be talking about heating (forced air and hydronic), cooling and ventilation. I will review the difference between sensible energy recovery and total energy recovery and how this may affect the building envelope.

Finally, we conclude the conversation by trying decide if an issue or concern is due to the mechanical system or the building envelope and how this problem could be resolved either mechanically or through changes in the building envelope or by looking at the two systems together.

Presenter: Stephen Farrell, P.L. (Eng.), C.E.M.

Stephen Farrell, P.L. (Eng.), C.E.M. studied mechanical engineering, and has over 25 years’ experience in mechanical system design and residential and commercial energy efficiency consulting. He owns and operates Acacia Engineering Ltd., VerdaTech Energy Management and Consulting Inc., and is partnered with a leading expert in the building envelope industry, Darrell Paul of Qualistat Building Performance Consultants.

Stephen has extensive experience in mechanical engineering design and consulting, with a focus on HVAC and plumbing design for commercial, institutional, industrial, multi-family and residential applications.

Stephen is also a Certified Energy Manager and his extensive experience in the energy efficiency field provides him with a solid understanding of how mechanical systems, the building envelope, and occupant behaviour impact the energy efficiency performance of a building. He has been actively involved with Natural Resources Canada in consulting on and managing various energy efficiency programs. His company VerdaTech has completed over 50,000 residential energy assessments and is a licensed service provider for NRCan’s ERS version 15, EnergyStar for New Homes and R-2000 programs.

He is a certified trainer for existing homes, new homes and MURBs and over the last 18 years, has trained in excess of 100 advisors. He also has presented various energy efficiency seminars for numerous organizations, including the City of Medicine Hat, Town of Banff, and City of Calgary. Stephen is also currently serving on the Metro Vancouver “Rate Our Home & Labelling” steering committee for energy labelling, labelling disclosure and integration with the BC Energy Step Code.


  • on the website by noon Monday (week of the luncheon) – please complete the form including your guest’s names.
  • $40 for members
  • $50 non-members
  • vegetarian meals now available upon request – please specify with your online registration.

No walk-in registrations – prepay ONLY on the website.

Become a Member, click here.
Membership Renewals, click here.



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