Network Management age e and Data Center Thermal Management Can Live Together Ian Seaton Chatsworth Products, Inc.
Benefits of Hot Air Isolation 1. Eliminates reliance on thermostat 2. Eliminates hot spots 3. Eliminates obstacles to higher rack densities 4. Eliminates CRAH fan energy waste 5. Increases CRAH coil efficiency 6. Increases chiller efficiency through higher set points 7. Increases access to free cooling hours 8. Supports greater data center design flexibility
How good is good enough? Test Setup Thermocouples used to measure leakage (see figure 3) Including CRAH S&R All cabinets, tiles, and exhaust Pressure measured using differential transducer Under floor Room Ceiling return HA Figure 3:Test mapping, red TC location, green pressure location Flow measured Balometer and tile characterization
How good is good enough? 9% Leakage 17%L 1.7% Leakage 7.49⁰F ΔT 1.45⁰F ΔT
What does that 6⁰F difference buy us? Chiller Energy Savings: 35,000 kw/h @ 100 tons 175,000 kw/h @ 500 tons 350,000 kw/h @ 1000 tons Atlanta Dallas Denver Chicago Seattle More Free Cooling Hours Waterside Economizer 1471 extra hours 1177 extra hours 993 extra hours 1353 extra hours 658 extra hours
What does that 6⁰F difference buy us? Chiller Energy Savings: 35,000 kw/h @ 100 tons 175,000 kw/h @ 500 tons 350,000 kw/h @ 1000 tons Atlanta Dallas Denver Chicago Seattle More Free Cooling Hours Waterside Airside Economizer 1406 1471 extra hours 1430 1177 extra hours 530 993 extra hours 1353 974 extra hours 277 658 extra hours
What does that 6⁰F difference buy us? Chiller Energy Savings: 35,000 kw/h @ 100 tons 175,000 kw/h @ 500 tons 350,000 kw/h @ 1000 tons Atlanta Atlanta Dallas More Free Cooling Hours Waterside Airside Economizer More Free Cooling Hours Indirect Evaporative Economizer 1406 1471 extra hours 2078 extra hours 1430 1177 extra hours Dallas 2110 extra hours Denver Denver Chicago 530 993 extra hours 30 extra hours 1353 974 extra hours Chicago 1151 extra hours Seattle Seattle 277 658 extra hours 26 extra hours
Network Challenges to Airflow Management Cable distribution Cable management Non-standard airflow patterns
Cable distribution challenges
Cable distribution underfloor 90% increase in average airflow volume per perforated floor tile
Cable distribution overhead
Cable management within the cabinet Two large switches
Cable management within the cabinet Cold air required Cold aisle Hot aisle
Cable management within the cabinet Cold air path
Cable management within the cabinet: why it is important p = ƒ L ƥv 2 2 1.8 1.6 1.4 D 2 Hydraulic Diameter = 4A P Pressure (inh2o) 1.2 1 0.8 0.6 04 0.4 0.2 In 800mm 700mm cabinet with no large cabling: switch and effective airflow management g ducts: D = 5.6 8.4 4.4 4.6 0.98 0 0 10 20 30 40 50 60 CFM 0.2 H 2 O increase in p = 50% decrease in fan throughput
Switch Clearances and Airflow
Network Switch Airflow Recommended Front Cold Aisle Rear Hot Aisle
Network Switch Airflow Not Recommended..but Front Cold Aisle Rear Hot Aisle
Network Switch Airflow Not Recommended..but Front Cold Aisle Rear Hot Aisle
Network Switch Airflow Not Recommended..but Front Cold Aisle Rear Hot Aisle
Network Switch Airflow Not Recommended..but Front Cold Aisle Rear Hot Aisle
Network Switch Airflow Not Recommended..but Front Cold Aisle Rear Hot Aisle
Side-to-side switch airflow management Hot aisle cold aisle arrangement Chimney cabinet arrangement
Side-to-side switch airflow management Checklist: 1. Means of evacuating hot air 2. Means of keeping hot air away from fan in-takes 3. Means of minimizing obstructions to supply air 4. Means of managing cable without violating integrity of air delivery, evacuation and separation
Side-to-Front Breathing Switches
Rear-to-Front Breathing Switches Inlet Air Switch Exhaust Air
Does it really Matter? 518 kw IT load Inlet temperature ranges from 56⁰F to 85⁰F 82,500 CFM supplied 72⁰ set point (55-56⁰F supply) 44⁰F Chiller LWT Inlet temperature ranges from 73⁰F to 90⁰F 11 hot spots
Does it really matter? 72,000 CFM supplied Added hot aisle containment for core switches and storage 75⁰F supply air temperaturet 0 hot spots 33.5% CRAH energy savings 38% chiller energy savings Added cabinets with chimneys to entrance room Eliminated overhead duct delivery system Maximum inlet temperature for any equipment = 76⁰F
Summary of Topics Covered 1. Separation/containment is the essence of good airflow management 2. Good cable management practices enhance airflow management strategies 3. Network switches with non-standard airflow do not need to compromise airflow management best practices
QUESTIONS? Ian Seaton Global Technology Consultant On behalf of Chatsworth Products ianseaton62@hotmail.com (512) 809-5767