ASHRAE Journal- September 2008

Ventilation Air Ceiling Coil Coil Ventilation + Induced Air (1:3 Ratio) Induced Air Figure 2: Chilled beam, which is a ceiling-mounted induction unit. with a significant, perhaps 60%, reduction in coil load and energy use. The energy reduction occurs because with a greatly reduced outside airflow, air-handling unit coil load is reduced, even though the space cooling load is essentially the same. The chilled beams have no moving parts, require no electrical connection and require no maintenance beyond an occasional vacuuming of the induction coils. Non-air sources should be considered for laboratory spaces with high sensible cooling loads to reduce energy use. Air-distribution design and zoning offer additional opportunities to reduce the amount of outside air used for cooling and ventilation. The most obvious approach is to provide separate laboratory systems for laboratory spaces and to serve nonlaboratory spaces with systems that recirculate air and may have reduced pressure and filtration requirements. In some designs, laboratory spaces and office spaces can be intermixed, making separate systems for air distribution more difficult. Another opportunity is using transfer air to reduce the cooling load served directly by supply air. For example, in a recent project a freezer alcove was attached to a large open lab. The general laboratory exhaust grilles for the large open lab were located in the freezer alcove above the freezers. With this significant airflow, much of the load from the freezers was captured in the exhaust air before entering the room, reducing the required supply airflow to the space and the amount of outside air used for cooling. In a similar issue, fume hoods located in small enclosed rooms increase energy use. A preferred approach is to locate hoods in larger spaces, where hood exhaust requirements more closely align with cooling and minimum air change supply air requirements or in open alcoves off larger spaces to reduce airflow. Creative zoning and air-distribution system design can be used to reduce the amount of outside air used for cooling and energy use. Reducing Exhaust and Exhaust Makeup Go ahead, get more green this year. Sure, Carlyle compressors are green, but did you know using Carlyle can also lead to more green in your pocket—as much as $15,000 per store? Carlyle’s reliability means more than just a longer lasting compressor (a recent study of supermarket refrigeration racks showed our average life span is 9.9 years versus 5.2 years for the leading competitor), it means reduced downtime, less scrap waste going into the environment, and significant savings in repair and replacement costs. And for supermarket applications Carlyle offers our Compound Cooling compressor, the most energy efficient low temperature compressor in the industry. So why not consider the option that allows you to save time, money and the environment? There’s never been a better time to go green. For more information regarding Carlyle’s reliability data and the cost savings per store, visit www.CarlyleCompressor.com. A second driver in the amount of outside air used for cooling and ventilation is the airflow required to make up exhaust from laboratory spaces and equipment. Devices such as fume hoods, biological safety cabinets, snorkels, and canopy hoods are used to provide containment and local capture of odors and harmful materials and to remove heat and moisture. Equipment exhaust requirements can vary greatly between different facilities. In biomedical research facilities, there is a trend towards less chemical use and fewer exhaust devices, making it unlikely that September 2008 www.info.hotims.com/19354-10 ASHRAE Journal 29 http://www.CarlyleCompressor.com http://www.CarlyleCompressor.com http://www.info.hotims.com/19354-10

Table of Contents Feed for the Digital Edition of ASHRAE Journal- September 2008

ASHRAE Journal- September 2008 Section: Contents Contents Section: Commentary Options for Sustainability Section: Industry News The Silk Route for Energy Solar Thermal Is Unrealized Opportunity Industry Groups Sue City of Albuquerque Section: Letters Letters Section: Meetings and Shows Meetings and Shows Section: Feature Articles Article-Radiant Floor Cooling Systems Article-HVAC Design for Sustainable Lab Article-Mixed Mode Ventilation Article-Single- Design Considerations For Active Chilled Beams Article-Acoustic Design In Green Buildings Article-Teams, Contracts & BIM Section: Building Sciences Some Old Lessons Distilled Section: Washington Report Energy in Federal Buildings Section: Products HVAC&R Product Showplace Section: Emerging Technologies Toplighting & Lighting Controls For Commercial Buildings Section: Special Products Fans & Blowers Section: Classified Ads Classified Ads Section: Advertising Index Advertising Index

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