Engineered Systems - November 2008 - (Page 38)

CRITICAL CLEANING CRITICAL CLEANING DEMANDS GOODWAY. DEMANDS GOODWAY. The IAQ TOP 1O In areas that can be expected to occasionally become wet such as bathrooms and kitchens, using more moisture-tolerant materials such as fiberglass-faced gypsum board or cement board makes sense. Also, since gypsum board will wick water up, it is a good idea to set the board 3/8 to ½ in. above the floor and then fill the air gap with a moisture -resistant sealant. CHILLER TUBE CLEANERS FOR SMOOTH AND ENHANCED TUBES Goodway’s line of Ream-A-Matics® makes tough tube cleaning a simple, one-person operation. Each machine can use a variety of quick connect brushes and cleaning tools mounted to the tip of a rotating flexible shaft, along with a simultaneous water flush, to remove deposits. Both electric and air powered units are available, as well as units with reversible shaft rotation, a shaft feeder gun, chemical injection, and a 500 PSI power flush. So the next time you need to clean your chiller — clean it the good way. To find out more, call Goodway today at 800-333-7467, or visit us online at www.goodway.com. 7 ® SOILED DIFFUSERS You know that black soiling that you sometimes see on the ceiling around ventilation system supply diffusers? Well, it does not mean that you need to clean the ventilation system ducts. What it does mean is that there is a relatively high concentration of airborne particles in the indoor air, most of which are generated indoors. Dirt accumulates on the ceiling by the ventilation system supply diffusers because the supply diffuser air jet causes the laminar boundary layer of air attached to the ceiling to get thinner which increases the deposition rate of particles to the surface. This soiling looks bad and contributes to the occupants’ perception of poor IAQ. The solution is to clean the soiling around the diffusers. To minimize the frequency of reoccurrence, reduce the indoor concentrations of airborne particles by increasing the efficiency of the ventilation system air filters. PARTICLE EMISSIONS FROM VENTILATION SYSTEMS Another condition that causes occupants to become concerned regarding IAQ is when black particulate matter is emitted from the supply air diffusers such that every morning when you come to work there is a sprinkling of little dark particles on your desk. As your desk is right under a ventilation system supply diffuser, you correctly suspect that the ventilation system is the source of the particles. This is caused by the fiberglass sound liner in the ventilation system, which is old and has become brittle and is shedding small pieces of the black encapsulated fiberglass each morning when the system starts up. While these particles of sound liner are too large to remain airborne and be inhaled, they do settle onto surfaces where they are unsightly at best and at worst can cause skin irritation. The solution is to replace or repair the degrading sound liner with an encapsulant. In addition, cleaning the ventilation system ductwork of fiberglass particles that have been shed into the system is sometimes required. Changing the ventilation system drive to a VFD and programming it for a soft start also helps reduce the sudden acceleration of the air in the supply ducts on start up, thus reducing the movement of the shed fiberglass particles down the ductwork and out the supply air diffuser. AIR FILTRATION Keep the ventilation system and cooling coils clean with air filters that have a particle-removal efficiency equal to or greater than MERV 8 as determined by ASHRAE 52.2 and preferably MERV 11 or MERV 13. In areas that EPA has designated as non-attainment areas for ozone (e.g., Los Angeles and Houston areas), ozone that is brought in with the outdoor air can react with indoor air contaminants that are relatively benign, such as terpenes, to produce ultrafine aerosols and aldehydes such as formaldehyde that are potent respiratory irritants. In these ozone non-attainment areas, having air filters that reduce the concentration of ozone makes sense. Most air filters designed for www.goodway.com Innovative Maintenance Solutions Input 93 at www.esmagazine.com/instantproductinfo SHERLOCK REFRIGERANT LEAK MONITORING R-11 R-12 R-22 R-114 R-123 R-134A R-401A(MP39) R-401B(MP62) R-402A(HP80) R-404A(HP62) R-407C R-408A(FX10) R-409A(FX56) R-410A(Puron) R-500 R-502 R-507A(AZ50) R-717(NH3) Call the factory for list of additional refrigerants GE NE SI S tar ts i nt he be SHERLOCK CONTROLS SOLID STATE & GAS SPECIFIC INFRARED SENSOR ALARM INDICATION DEVICES EVERYTHING FOR ASHRAE 15-2004 AND MECHANICAL CODE COMPLIANCE 8 GENESIS INTERNATIONAL, INC. 1040 Fox Chase Industrial Drive Arnold, MO 63010 Phone: (636) 282-0011 Email:mail@genesis-international.com FAX: (636) 282-2722 Web:www.Genesis-International.com Input 136 at www.esmagazine.com/instantproductinfo 38 ESM09074Gen.indd 1 En gi neer ed S y stem s Qu The SHERLOCK Refrigerant Gas Monitoring System is an extensive family of monitoring panels, sensors, external alarms, and breathing apparatus designed to make any machine room code compliant. The SHERLOCK line includes electronic monitors with either two or three alarm levels. Each alarm level has two relay outputs for various functions including activating audio-visual alarm indication devices, energizing exhaust fans or notifying the building automation system. The SHERLOCK sensor modules utilize both solid state CMOS for engine room and ventline which meet most specifications and budget considerations or infrared (IR) sensor technology, when accuracy is extremely important. The IR will virtually eliminate all false alarming. SHERLOCK also can provide several varieties of Self Contained Breathing Apparatus to meet the requirements of most mechanical safety codes. gin SELF-CONTAINED BREATHING APPARATUS nin g! 9 ali ty t ha ts November 2008 8/14/07 11:30:24 AM http://www.goodway.com http://www.goodway.com http://www.goodway.com http://www.esmagazine.com/instantproductinfo http://genesis-international.com http://genesis-international.com http://www.esmagazine.com/instantproductinfo

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

Engineered Systems - November 2008 Contents Editor’s Note HVAC Challenge Back2Basics Case In Point Commissioning Building Automation HVACR Designer Tips Show Me The Motor Money The IAQ Top 10 Putting A Damper on Tragedy Special: Lighting Controls Computers & Software Products Glossary Classifieds Advertiser Index Tomorrow’s Environment

Engineered Systems - November 2008

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