1. By Graham Brooks

2. What is HVAC? Heating Ventilating Air Conditioning Cycle: Refrigeration Ductwork in buildings Units on roofs The refrigeration cycle

3. Datacenter HVAC vs. HVAC Unique design problem High electrical loads Specific Conditions -Humidity -Temperature Specialized Equipment Above ceiling ductwork

4. Design Conditions Temperature - Typically between 68-77 degrees F Prevent equipment overheating Humidity (Relative) - optimal between 40-55% at all times Humidity Low -> Electrostatic Discharge Humidity High -> Affects equipment (moisture)

5. Design Process &Considerations Load calculation -Determines necessary cooling Redundancy -Add backup unit -Uninterruptible power supply Ductwork -Ceiling diffuser(s) -Supply plenum with perforated floor -Cold air hits front of servers; hot air returned Air blowing directly out of unit

6. Closing Servers are critical -Internet -Business use -Commerce Specialized Units -expensive -ex: Liebert Questions? Liebert datacenter air handler

7. Photo Credits http://en.wikipedia.org/wiki/File:Datacenter- telecom.jpg http://en.wikipedia.org/wiki/File:Datacenter- telecom.jpg http://www.cpsc.gov/cpscpub/prerel/prhtml01/liebert.jpg http://www.cpsc.gov/cpscpub/prerel/prhtml01/liebert.jpg http://www.gruberpowerservice.com/applications/Cat alogManager/images/Liebert_AP648T-trans-340.gif http://www.gruberpowerservice.com/applications/Cat alogManager/images/Liebert_AP648T-trans-340.gif