Posts in Category: Energy

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Reducing Duct Leakage in Existing Buildings: Aeroseal Technology 

October, 12, 2015 at 32:00 Categories: Energy engineering


Written by: Nicholas Neiley, Project Engineer

Unchecked, duct leakage can be a significant added cost in any ventilation system; particularly existing laboratory buildings. The cost to condition and deliver outdoor air can range from $7 to $12/cfm per year depending on local climate and utility costs. This can make any leakage on 100% outdoor air systems extremely expensive. During a recent controls upgrade project at Cornell University, significant utility savings were captured through the use of a duct sealing technology called Aeroseal.

The Baker Lab project initially included an upgrade the control system of a modern DDC system to address ongoing maintenance and energy efficiency concerns. During testing, balancing, and commissioning, it was identified that the existing ductwork systems had significant leakage, up to 30% in some locations. This was largely due to the existing ductwork systems utilizing clay flues in the original 1921 building construction. An Aeroseal vendor was contracted to seal all the exhaust risers and most supply risers.

 

Identifying and Fixing a $250,000 blunder 

July, 28, 2015 at 35:00 Categories: Building Commissioning Energy Energy Efficiency engineering

By: Scott Lance, EBCP, LEED AP O+M, Senior Project Engineer

Overview:

  • HEA was hired to provide commissioning services for a higher education dormitory.
  • During the test and balance (TAB) period of the project, it was discovered by the TAB contractor and HEA that the dual temperature system was unable to be balanced. It was also noted that the extremities of the two wings of all three floors could not provide any heat to the occupied dorm rooms. This resulted in parents pulling students out of school due to the dorms not being able to be heated and 85% redo of the building piping systems - a $250,000 error!

 

Greenbuild 2014: Impressions and Lessons Learned 

greenbuild1

So it’s that time of the year again….leaves are changing colors….pumpkin everything is abound….and time for Greenbuild 2014! This is my third Greenbuild, with Toronto -2012 & Flipadelphia – 2013 (go Mets!) being my predecessors, so we were going into New Orleans – 2014 with a good idea of what to expect and how to “attack” the conference.