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In many cases, the end of the year gives you time to step back and take stock of the last 12 months. This is when many of us take a hard look at what worked and what did not, complete performance reviews, and formulate plans for the coming year. For me, it is all of those things plus a time when I u...
Technical Brief Details How DX AC Systems Can Meet ASHRAE IAQ and Energy Savings Standards

WOBURN, Mass., Jan. 23, 2013 /PRNewswire/ -- Engineers designing commercial HVAC systems for use in schools, hospitals, factories or office buildings face a host of conflicts and tradeoffs when trying to comply with both ASHRAE Standard 90.1 for Energy Efficiency and ASHRAE Standard 62.1 for Indoor Air Quality (IAQ). To help engineers achieve a successful balance between the two, a new technical brief, "No More Tradeoffs: Designing DX AC Systems to Meet ASHRAE's IAQ and Energy Savings Standards" is now available to download from Rawal Devices, Inc. at

Over the past decades, ASHRAE 90.1 promoted energy efficiency as a predominant design factor in air conditioning equipment. Standards for building design, insulation, glass, and ventilation were affected by the amount of thermal energy brought in from the outside air. More recently, ASHRAE 62.1 emphasized IAQ requirements and focused on proper ventilation and humidity control for operations and health issues. Studies meanwhile have confirmed the problems caused by tight, energy-efficient buildings that do not have correct ventilation. As a result, engineers face a balancing act between energy savings and IAQ in AC system design.

The new technical brief, "No More Tradeoffs...," presents the solution as the use of the direct expansion (DX) air conditioning "discharge air temperature" reset concept (based upon outdoor air conditions), plus continuous capacity modulation for the refrigeration circuit. Discussing the limitations of DX AC design, the brief details the "temperature reset with capacity modulation" solution with sample data and calculations. Several effective approaches are explored, including the use of VFD and digital compressors, and the Rawal APR-E electronic control.

Download "No More Tradeoffs: Designing DX AC Systems to Meet ASHRAE's IAQ and Energy Savings Standards" from Rawal Devices, Inc., at

About Rawal Devices, Inc.

Rawal Devices is the manufacturer of highly efficient and cost-effective solutions that solve temperature and humidity control problems in industrial, institutional, and commercial building applications. Rawal's APR Control makes any standard air conditioning unit a variable-capacity system. The Rawal device permits the system to extend the cycle of operation, continuously matching capacity to changing load conditions while keeping the system in a dehumidifying mode. Rawal's unique combination of technology, expertise, and service ensures proper temperature and humidity control for greater indoor comfort, air quality, and energy savings. For more information, visit the website at

SOURCE Rawal Devices, Inc.

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