How To Size A Waterside Economizer Part 1: How ASHRAE 90.1 Updates Have (Or WILL) Change Chilled Water Design

Has your state adopted ASHRAE 90.1-2010 or beyond into its commercial building code? If so, then it is highly likely that you should be incorporating either waterside or airside economizing into your cooling design. The Standard has effectively made air or waterside economizing a requirement in virtually every…

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How To Develop Cooling Tower Life Cycle Cost Analysis: Introduction

How To Develop Cooling Tower Life Cycle Cost Analysis: Introduction

Cooling towers cost money. Cooling towers save money. In between those two statements lies a host of variables that must be evaluated in order for the engineer to make an informed decision on behalf of…

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Thinking Beyond Plate & Frame Heat Exchangers for Waterside Economizing

By Chad Edmondson

  “What type of heat exchanger is best for my waterside economizer application?”

 It’s a question we get asked a lot.  With the increased requirement for either an air or waterside economizing in ASHRAE 90.1 – 2010, we expect to get asked even more – especially since the DOE expects states to adopt the revised standard into their non-residential building codes by as early as next month.

 U-Factor Versus Real-World-Factor

Conventional engineering logic has always leaned toward plate and frame technology for waterside

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Designing Waterside Economizer Piping to Meet ASHRAE 90.1 - 2010

By Chris Edmondson 

Gone are the days of optional air or waterside economizing.  Gone also are the days of waterside economizers piped in parallel.  In other words, the “either/or” operation of the chillers and economizers that we’re all accustomed to will soon be a thing of the past.

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