November Dinner Meeting


N_Alberta_Logo_Horizontal - TOP
University of Alberta Faculty Club
11435 Saskatchewan Drive
T6G 2G9

Wednesday, November 22, 2017
Cocktails - 5 PM

Dinner - 6 PM, Presentation to follow

Defending Primary-Secondary: A Review of Piping Design for Modern Condensing Boilers

Since the advent of the firetube condensing boiler, much design work has been done configuring systems to utilize this technology to maximum effect. This has led to the popularity of Primary-Only piping (also called Primary-Variable or Direct-Primary), where system return water is not tempered before returning to the boiler plant, promoting maximum condensation.


But while the benefits to this design can be worth pursuing, traditional Primary-Secondary piping remains the far more versatile, flexible, and adaptable design method, due to the hydraulic separation that takes place in decoupler. And it is not necessarily less efficient, as this depends on loop flow rates and “Delta-T”, and the mixing action that takes place as a result.


This presentation will explore the differences and advantages to each piping method.


  1. Hydronic Fundamentals – A quick review of basic engineering principles. What is hydraulic separation, and why does it matter? What’s the best way to arrange a system? What is the “Point of No Pressure Change,” and why does the system configuration depend on it?
  2. Delta-T and Decoupler Bypass – A review of the impact the system and heat-source loop flow rates, and corresponding Delta-T differences, will have on the mixing that takes place at the decoupler.
  3. Outdoor Reset – The impact that outdoor reset schedules will have on system Delta-T and flow rate.
  4. Pressure Drop – The impact that piping design will have on pressure drop at the boiler plant, why this limits design flexibility for Primary-Only systems, and why Primary-Only piping may cause issues in a retrofit.
  5. Operational Comparison – Comparison of the same system in operation when piped Primary-Secondary or Primary-Only, what the efficiency benefits are, and just how much fuel and electrical savings can realistically be expected.


Presenter: Tom Heckbert

Product Manager – Camus Hydronics



Members -  $50
Non- Members  - $65
Students  - $20

RSVP by November 20, 2017

Meeting Proudly Sponsored by Wesmech




  • When

  • Wednesday, November 22, 2017
    5:00 PM - 8:30 PM

  • Where

  • University of Alberta Faculty Club
    11435 Saskatchewan Drive
    Edmonton, Alberta T5J 1E3
    (780) 492-4231

Outlook Outlook
iCal iCal
Google Google
Yahoo! Yahoo!