Engineered Systems - August 2008 - (Page 27)

main gambling area under the atrium, which was perpetually in cooling mode), or the water could not be adequately cooled without passing the dewpoint and introducing condensation problems. Natural ventilation would have been a good method of ventilation with the tall, central atrium using natural stack effect to allow the hot air to rise upwards and out of the building, but without alternate (non-air) means of heating and cooling the space, it would have been ineffective. THE SOLUTION The most efficient solution turned out to be a displacement cooling system. This system would take advantage of the standard raised casino floor and the stack effect created by the atrium. The displacement cooling also reduced our cooling load in the occupied space (the lower 8 ft above the floor), as convective heat from overhead lighting and equipment never reaches the occupied space. This lowered the amount of supply air required and allowed us to use higher temperatures for the supply air. The non-mixing low velocity delivery also eliminated the drafts that can occur with conventional UFAD systems. At the same time, we could address the constant cooling load of the central space separately from the varying perimeter loads in the double façade void area. We installed dedicated fancoil units in the double façade to handle the heating and cooling loads from the outside skin in the space between the inside layer of fabric and the outside layer of glazing. A picture truly is worth a thousand words, and Figure 1 shows how the double façade and the displacement cooling system function together to condition the casino. DOUBLE FAÇADE The final design incorporates an interior opaque wall of fabric to create the double façade. We met the city’s life within the building requirement by including a lighting system in the void between the skins that mimics the look of normal building operations. The inside skin addressed the issue of sun glare on the security cameras as no natural light penetrated into the casino gaming space. A double façade is a passive way of reducing or eliminating the effects of the skin loads due to seasonal temperature variations. The design is particularly effective because it doesn’t fight the laws of physics. Low-level intake louvers and high-level exhaust louvers throughout the façade handle the air between the two skins. In addition, dedicated air fancoil units were installed at ground level within the double façade to assist with air movement in the void space when necessary. You can’t control Mother Nature But you can control your environment Keep your workspace clean, comfortable and productive AIR CURTAINS • MAKE-UP AIR SYSTEMS Mars Air Systems featuring ARES • Dynaforce Mars Air Doors “The only choice for an “Air of Quality”! 800-421-1266 Tel: (310) 532-1555 • www.marsair.com Input 137 at www.esmagazine.com/instantproductinfo “Fast and easy.” DuraDrive Fastest, easiest to install. New TAC DuraDrive VBB/VBS Series ball valves and actuators all feature quick release technology. It’s easy to make the smart choice. Choose TAC DuraDrive. Think fast. Go to: www.tac.com/duradrive Input 146 at www.esmagazine.com/instantproductinfo w w w. esmag a zin e. c o m ESM08084Tac.indd 1 Pr od u Av ct L ai ite On la r lin ble atu re e 27 7/18/08 10:18:19 AM http://www.marsair.com http://www.marsair.com http://www.esmagazine.com/instantproductinfo http://www.tac.com/duradrive http://www.tac.com/duradrive http://www.esmagazine.com/instantproductinfo http://www.esmagazine.com

Table of Contents Feed for the Digital Edition of Engineered Systems - August 2008

Engineered Systems - August 2008 Contents Editor's Note Back2Basics HVAC Challenge Case In Point Commissioning Building Automation Efficiency Incentives HVACR Designer Tips Glass Box to Grand Casino Looking Radiant In Green Mechanical Products Sourcebook Q&A: Dehumidification In Schools Building Oversight Management: M&V And More Products Classifieds Advertiser Index Tomorrow's Environment

Engineered Systems - August 2008

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.