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October 12, 2017

Quick installation of commercial self-contained units at the Custom House in Boston, MA

September 10, 2016

Understanding the basics of ANSI/AHRI 920-2015: Performance Rating of DX-Dedicated Outdoor Air System Units

  • ASHRAE realized that standard methods of efficiency rating (EER for example) do not accurately reflect the efficiency of a packaged DOAS system.  Instead, the...

June 1, 2015

Dedicated Heat Recovery is not a new topic.  In 2003 ASHRAE published an article detailing the technology and advantages of dedicated heat recovery chillers (DHRC) – see link below.  However, these systems become increasingly beneficial with the advent of modular chill...

December 1, 2014

Modular chillers offer a unique set of advantages to conventional machines - which we'll cover in a future post.  The focus here will be on incorporating a modular chiller in a variable flow system.  We will touch on the basics here.  More information can be found in t...

August 1, 2014

Here are a few helpful equations that we've found helpful through the years.  Future posts will build on this list, and the back of our line card will have a summary of them all. 

Cooling tonnage:

TONS = ((evap gpm) x (evap ΔT)) / (24) 

*assumes evap ΔT in degrees F,...

June 3, 2014

In some cases, it benefits the system to incorporate some means of false-loading on the compressors.  Both Rawal valves and Hot Gas Bypass provide a solution for this.  In both cases, we're able to trick the compressor into staying on-line even if we do not have the lo...

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United CoolAir - Minimizing Install Time & Costs @ Custom House Boston

October 12, 2017

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