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Johnson Controls-Hitachi Air Conditioning

Paper Details How DX AC Systems Can Meet ASHRAE IAQ, Energy Standards

Feb. 26, 2013
The brief discusses direct-expansion air-conditioning "discharge-air-temperature" reset, plus continuous capacity modulation for refrigeration circuits.

Engineers designing HVAC systems for use in schools, hospitals, factories, and office buildings face a host of conflicts and tradeoffs when trying to comply with both ANSI/ASHRAE/IES Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, and ANSI/ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality. To help engineers achieve balance between the two, Rawal Devices Inc., manufacturer of temperature- and humidity-control solutions for 
industrial-, institutional-, and commercial-building applications, recently published a technical brief, “No More Tradeoffs: Designing DX AC Systems to Meet ASHRAE’s IAQ and Energy Savings Standards.”

The brief explores advantages and disadvantages of available solutions and reveals how making the right selection can improve a building’s energy efficiency and indoor-air quality (IAQ) without compromising performance.

“No More Tradeoffs: Designing DX AC Systems to Meet ASHRAE’s IAQ and Energy Savings Standards” is available for download at

About the Author

Scott Arnold | Executive Editor

Described by a colleague as "a cyborg ... requir(ing) virtually no sleep, no time off, and bland nourishment that can be consumed while at his desk" who was sent "back from the future not to terminate anyone, but with the prime directive 'to edit dry technical copy' in order to save the world at a later date," Scott Arnold joined the editorial staff of HPAC Engineering in 1999. Prior to that, he worked as an editor for daily newspapers and a specialty-publications company. He has a bachelor's degree in journalism from Kent State University.