Engineered Systems - April 2008 - (Page 35) ave you ever been flat-out wrong about something? Perhaps, in the middle of a discussion, you blustered, “No way!” … only to hear the oft-heard retort, “Dude, way.” Well, it hasn’t happened that often to me, but not because I’m always right. Rather just the opposite. When I don’t completely understand something, I’m usually bright enough not to be critical. You know the old adage that it’s better to keep silent and be thought an idiot than to open your mouth and remove all doubt? I had that tattooed on my chest just so I wouldn’t forget. But one day, I stood in the project war room on a mission critical facility, and pontificated, “Of the two schemes we are evaluating, I guarantee you that one just won’t fly.” And what was the concept? I didn’t know it at the time, but it was the very concept I would be passionately advocating for just four weeks later. SOME BACKGROUND My firm was fortunate enough to be chosen to be on the team for a significant data center facility with a 70,000-sq-ft raised floor area (RFA). For context, that’s a data hall the size of a football field, with a load around 100 W/sq ft. The estimated cooling load for the facility was nominally 2,000 tons with N+1 redundancy. The concept designers who had been working on the job prior to our arrival had two cooling schemes in mind. Both were variable primary, but one was a water cooled centrifugal plant with variablespeed chillers and evaporative cooling towers. The second was a glycol condenser loop utilizing dry coolers and compressorized computer room air conditioning (CRAC) units. The owner’s operating staff was aghast at the thought of having hundreds of compressors throughout the building whose eventual replacement and maintenance could very well become overwhelming. w w w. esmag a zin e. c o m 35 http://www.esmagazine.com
Table of Contents Feed for the Digital Edition of Engineered Systems - April 2008 Engineered Systems - April 2008 Contents Editor’s Note Back2Basics HVAC Challenge Case In Point Commissioning Building Automation Energy Wiz HVACR Designer Tips This Time, Water Cooled Was All Wet Cleanroom Design In 10 Easy Steps It's Not The Heat, It's The Humidity Issues & Events Computers and Software Products Glossary Classifieds Advertiser Index Tomorrow’s Engineer Engineered Systems - April 2008 Engineered Systems - April 2008 - (Page Intro) Engineered Systems - April 2008 - Engineered Systems - April 2008 (Page 1) Engineered Systems - April 2008 - Engineered Systems - April 2008 (Page 2) Engineered Systems - April 2008 - Engineered Systems - April 2008 (Page 3) Engineered Systems - April 2008 - Contents (Page 4) Engineered Systems - April 2008 - Contents (Page 5) Engineered Systems - April 2008 - Contents (Page 6) Engineered Systems - April 2008 - Contents (Page 7) Engineered Systems - April 2008 - Editor’s Note (Page 8) Engineered Systems - April 2008 - Editor’s Note (Page 9) Engineered Systems - April 2008 - Back2Basics (Page 10) Engineered Systems - April 2008 - Back2Basics (Page 11) Engineered Systems - April 2008 - HVAC Challenge (Page 12) Engineered Systems - April 2008 - HVAC Challenge (Page 13) Engineered Systems - April 2008 - Case In Point (Page 14) Engineered Systems - April 2008 - Case In Point (Page 15) Engineered Systems - April 2008 - Case In Point (Page 16) Engineered Systems - April 2008 - Case In Point (Page 17) Engineered Systems - April 2008 - Case In Point (Page 18) Engineered Systems - April 2008 - Case In Point (Page 19) Engineered Systems - April 2008 - Case In Point (Page 20) Engineered Systems - April 2008 - Case In Point (Page 21) Engineered Systems - April 2008 - Case In Point (Page 22) Engineered Systems - April 2008 - Case In Point (Page 23) Engineered Systems - April 2008 - Case In Point (Page 24) Engineered Systems - April 2008 - Case In Point (Page 25) Engineered Systems - April 2008 - Commissioning (Page 26) Engineered Systems - April 2008 - Commissioning (Page 27) Engineered Systems - April 2008 - Building Automation (Page 28) Engineered Systems - April 2008 - Building Automation (Page 29) Engineered Systems - April 2008 - Energy Wiz (Page 30) Engineered Systems - April 2008 - Energy Wiz (Page 31) Engineered Systems - April 2008 - HVACR Designer Tips (Page 32) Engineered Systems - April 2008 - HVACR Designer Tips (Page 33) Engineered Systems - April 2008 - This Time, Water Cooled Was All Wet (Page 34) Engineered Systems - April 2008 - This Time, Water Cooled Was All Wet (Page 35) Engineered Systems - April 2008 - This Time, Water Cooled Was All Wet (Page 36) Engineered Systems - April 2008 - This Time, Water Cooled Was All Wet (Page 37) Engineered Systems - April 2008 - This Time, Water Cooled Was All Wet (Page 38) Engineered Systems - April 2008 - This Time, Water Cooled Was All Wet (Page 39) Engineered Systems - April 2008 - This Time, Water Cooled Was All Wet (Page 40) Engineered Systems - April 2008 - This Time, Water Cooled Was All Wet (Page 41) Engineered Systems - April 2008 - This Time, Water Cooled Was All Wet (Page 42) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 43) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 44) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 45) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 46) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 47) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 48) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 49) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 50) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 51) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 52) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 53) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 54) Engineered Systems - April 2008 - Cleanroom Design In 10 Easy Steps (Page 55) Engineered Systems - April 2008 - It's Not The Heat, It's The Humidity (Page 56) Engineered Systems - April 2008 - It's Not The Heat, It's The Humidity (Page 57) Engineered Systems - April 2008 - It's Not The Heat, It's The Humidity (Page 58) Engineered Systems - April 2008 - It's Not The Heat, It's The Humidity (Page 59) Engineered Systems - April 2008 - It's Not The Heat, It's The Humidity (Page 60) Engineered Systems - April 2008 - It's Not The Heat, It's The Humidity (Page 61) Engineered Systems - April 2008 - It's Not The Heat, It's The Humidity (Page 62) Engineered Systems - April 2008 - It's Not The Heat, It's The Humidity (Page 63) Engineered Systems - April 2008 - Issues & Events (Page 64) Engineered Systems - April 2008 - Issues & Events (Page 65) Engineered Systems - April 2008 - Issues & Events (Page 66) Engineered Systems - April 2008 - Issues & Events (Page 67) Engineered Systems - April 2008 - Issues & Events (Page 68) Engineered Systems - April 2008 - Computers and Software (Page 69) Engineered Systems - April 2008 - Products (Page 70) Engineered Systems - April 2008 - Products (Page 71) Engineered Systems - April 2008 - Products (Page 72) Engineered Systems - April 2008 - Glossary (Page 73) Engineered Systems - April 2008 - Classifieds (Page 74) Engineered Systems - April 2008 - Classifieds (Page 75) Engineered Systems - April 2008 - Classifieds (Page 76) Engineered Systems - April 2008 - Advertiser Index (Page 77) Engineered Systems - April 2008 - Tomorrow’s Engineer (Page 78) Engineered Systems - April 2008 - Tomorrow’s Engineer (Page 79) Engineered Systems - April 2008 - Tomorrow’s Engineer (Page 80)
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