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  • Home
    • What's New
  • Blog
    • Blog Support
  • SketchUp Models
    • SketchUp Resources
    • Bureaucratic Affairs Building HHW System Logic Exercise
    • Bureaucratic Affairs Building Scavenger Hunt
    • Chilled Water Plant System Diagram Exercise
    • The HIjend Hotel >
      • Chilled Water Plant Scoping Exercise
      • Ballroom AHU Scoping Exercise
      • Cooling Tower Scoping Exercise
  • Tools
    • Altitude Correction Factor
    • Economizer Evaluation Checklist
    • Eikon for Educators and WindLGC
    • Effective Duct Length Tool
    • Excel Third Axis Tool
    • Excel Time Value Conversion
    • Insulation Savings Tools
    • Logic Diagram Tool
    • Mixed Air Calculations
    • Monitoring Plan Spreadsheet
    • Pipe Friction Chart
    • Plot Digitizer >
      • Plot Digitizer Pump Curve Example
    • Square Law Spreadsheet
    • System Diagram Symbols
    • Thermodynamic Diagrams Spreadsheet
    • Universal Translator Data Analysis Tool
    • y = (m * x) + b Spreadsheet
  • Useful Formulas
    • Affinity Laws
    • Circular Equivalent Duct
    • Effective Duct Length
    • FT Guide Appendix C
    • HVAC Equations and Concepts
    • Hydraulic Diameter
    • Pump Power and Energy
    • "Square Law"
  • What's That Thing?
    • Cooling Towers
    • Pumps
    • Valves
  • Resources
    • Bill Coad's Writings
    • Control and Logic Diagram Standards
    • Data Logging Resources
    • EBCx Skills Guidebook
    • Energy Design Resources
    • Fisher Controls Valve Cavitation Bulletin
    • Functional Testing Guide
    • Honeywell Gray Manual
    • MCC Powers Bulletins
    • NBCIP Reports
    • PEC Tool Lending Library
    • PID Resources
    • Pneumatic Control Resources
    • Resource List
    • Scoping Resources
    • TAB Resources
    • Vintage Carrier Design Manual
    • VRF Systems
    • Williams' Wisdom
  • Videos
    • Bureaucratic Affairs HHW Logic Answers
    • Cooling Tower Flow Variation
    • Economizer Stratification
    • Functional Testing
    • Induction Principles
    • Monitoring Plans
    • Ripple Effects
    • Testing a Pump
    • Variable Flow Systems
  • Training
    • Materials from Classes and Presentations >
      • ACEEE
      • ASHRAE
      • ASHRAE - Engineers Notebook
      • BCxA and NCBC
      • BEST Institute
      • Case Studies
      • ERDC 2020 RCx Academy
      • ELPNW
      • ICEBO
      • Marriott AEP
      • Magazine Articles
      • NAVFAC
      • Pacific Energy Center Design, Performance and Commissioning Issues Classes >
        • PEC Class Materials Archive
      • Pacific Energy Center EBCx Project Review
      • Pacific Energy Center EBCx Workshop Series >
        • EBCx Workshop Series 12
        • EBCx Workshop Series 13
        • EBCx Workshop Series 14
        • EBCx Workshop Series 15 >
          • Student One On One Discussions
        • EBCx Workshop Series 16
        • EBCx Workshop Series 17
      • Portland General Electric
      • U of W >
        • U of W Archive
    • On Demand Training >
      • Fans, Ducts and AHUs
      • Induction Motor Principles
      • Introduction to Functional Testing
      • Scope of Work Documents
    • Training Opportunities
  • Contact
    • Copyright and Permissions

Variable Flow Pumping Systems

These videos look at different types of variable flow systems.  

Variable Flow System Overview and Evolution

The first video also contrasts variable flow with constant flow and illustrates how the quest for better efficiency pushed us from the constant flow systems - that were quite common when I first entered the industry in the mid 1970's - to variable flow systems and how advances in technology have allowed us to further optimize variable flow system operation.

Variable Flow Primary Secondary Heating Hot Water System Operation

This is a video I made to help a client document how their variable flow heating hot water system worked and explain it to the team working on the system.   It includes some of the basic principles behind pumps, two way and three way valves, variable speed drives, and balancing because you have to understand all of that to understand how the system works.  
The system uses thermostatic, self contained valves on the boiler loops and I discuss how they work and include schematics to illustrate this.

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