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  • SketchUp Models
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    • 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
    • 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
    • The Garden of Low Entropy
    • 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 >
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        • EBCx Workshop Series 16
        • EBCx Workshop Series 17
      • Portland General Electric
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National Building Control Information Program Reports (NBCIP)

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The Iowa Energy Center developed and published a number of very useful reports that are becoming more challenging to find on the internet.   There are three sets of reports as outlined below.

Return Fan Capacity Control Guide

If you are working with a variable air volume system that has a return fan, one of the major challenges is getting the return fan capacity to vary in a manner that tracks the supply fan capacity.  If you don't address this properly, you can have issues with ventilation (minimum outdoor air), and building pressurization.    This guideline looks at the five most common approaches to managing the return fan capacity and compares them from a design, installation, and operations standpoint.   The guideline is structured to include the following topics for each approach.
General Description 
  • General Description 
  • Advantages 
  • Limitations
  • Application Considerations
  • Key Design Issues/Considerations
  • ​Key Installation Issues/Considerations
  • Key Operating Issues/Considerations
  • Troubleshooting Table​
  • Sample Points List
  • Sample Narrative Sequence of Operations
  • Case Study
  • Additional Resources
Funding ran out before the final guideline was actually published. But the near final draft is technically correct; most of the edits that needed to be made were related to the presentation of the material rather than the technical content.   It contains quite a bit of useful information that was developed by knowledgeable people and went through a thorough peer review process.
Return Fan Application Guide (05_-_nbcip_return_fan_application_guide_-_10-26-11_near_final_draft.pdf)
File Size: 4932 kb
File Type: pdf
Download File

Duct Mounted Humidity Sensor Product Testing Report

Measuring moisture in the air is a very challenging undertaking and as a result, the sensors we use to do it are notoriously prone to error and require regular maintenance to ensure their accuracy.  In an effort to understand and document the issues, the Iowa Energy Center blind purchased multiple sensors from multiple vendors and tested them against lab standards and published the results.

Then, the took the sensors and installed them in operating system and retested them periodically over the course of a year to document the long term persistence of accuracy.  Those results were published in a supplement to the original report.

In addition to the comparison of sensors, the report includes basic information regarding how humidity is measured and how to go about selecting an appropriate humidity transmitter.  The report has been published for a while now, so it is likely that all of the manufactures have newer versions of the products that were tested.   But the fundamental information in the report still is valid as are the insights you will gain by reading it regarding longevity and the fact that all sensors are not created equal.
Humidity Sensor Reports (nbcip_humidity_sensor_reports.zip)
File Size: 2448 kb
File Type: zip
Download File

Wall Mounted CO2 Sensor Product Testing Report

These reports are similar in structure and content to the Duct Mounted Humidity Sensor Product Testing Reports.
Wall Mounted CO2 Sensors.zip
File Size: 7427 kb
File Type: zip
Download File

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