ASHRAE Journal- September 2008

Non-POE Refrigeration Oil for HFC Equipment out C h e c k it e ebs our w for o r c a ll FREE E! SAMPL Benefits Compatible with all HFC refrigerants R134a, R404A, R407C, R410A, etc. No Hydrolysis unlike POE (Polyolester) lubricants No reaction with water! PVE bond energy enhances anti-wear effectiveness Anti-wear effectiveness is enhanced when compared to POE Better solubility with process fluids Capillary Tube Blockage Superior resistance due to lack of hydrolysis Possible to eliminate HVAC systems filter dryer Traditionally, the ventilation ductwork for a VAV system is sized for maximum cooling and minimum ventilation rates. The VAV damper controlling the airflow into the occupied zone for ACBs can be sized for the greatest of either the ventilation air or the air volume required to control the latent cooling requirements. As the duct velocities are too low to support traditional VAV damper control, a more effective and stable control methodology is required. The static pressure at the chilled beam plenum can be used as the velocity pressure input signal to modulate the position of the VAV valve for fan energy savings, and is particularly effective at managing highly variable latent loads. Care must be exercised to monitor the return air CO2 levels to ensure that the space is not underventilated. Additionally, a dew-point sensor on the chilled water supply line is necessary to give priority control of the ventilation air in the event that the latent load exceeded the limits of the dehumidification effect offered via the primary air supply. Night setback, chilled water, hot water, and primary air reset are all effective strategies in mitigating operational costs. These should be considered a fundamental aspect of building control, given their relatively low-cost-to-benefit ratio. Maintenance Current Customers Carrier ● Daikin ● Hitachi LG Electronics ● Panasonic Sanyo ● Tecumseh and more In a properly designed ACB project, the coil surfaces will not condense. The fins of the unit mounted coils will remain dry, and will not become tacky. Although not true for every space, maintenance vacuuming can be as infrequent as once every three to five years. Additionally, since the fin surfaces of an ACB are relatively well gapped, dust and dirt particles tend not to bridge the fin surfaces. ACBs equipped with rubber nozzles may need to be replaced as a result of dry rot within their service life. Maintenance is nearly a nonissue with active chilled beams and can be used to address a variety of challenging applications. Summary Although they are not the solution for every space within commercial and institutional buildings, the strengths of active chilled beams are becoming a more useful tool to handle challenging spaces in today’s high performance buildings. The difficulty of meeting comfort requirements with a mechanical system that is exceedingly transparent is becoming easier thanks to the growing popularity of decoupled ventilation systems and active chilled beams. References Idemitsu Lubricants America Corporation 2000 Town Center • Suite 1450 • Southfield, MI 48075 phone: fax: (248) 355-0666 (248) 355-9337 For product and purchase inquiries, visit our website: PVE-Idemitsu-usa.com www.info.hotims.com/19354-31 1. Rumsey, P. 2007. “Chilled beams in labs: eliminating reheat and saving energy on a budget.” ASHRAE Journal 49(1):18 – 25. 2. Feustel, H. 1994. “Hydronic radiant cooling systems.” Center for Building Science News. Berkeley, Calif.: Lawrence Berkeley National Laboratory (3). 3. Butler, D., et al. 2007. Chilled Beam Application Guidebook, second ed. Belguim: REHVA. 4. Zboril, V., et al. “Air flow distribution in rooms with chilled beams.” Proceedings of Roomvent 2007. September 2008 58 ASHRAE Journal http://PVE-Idemitsu-usa.com http://PVE-Idemitsu-usa.com http://www.info.hotims.com/19354-31

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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