Center Thermal Management Can Live Together
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1 Network Management age e and Data Center Thermal Management Can Live Together Ian Seaton Chatsworth Products, Inc.
2 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
3 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
4 How good is good enough? 9% Leakage 17%L 1.7% Leakage 7.49⁰F ΔT 1.45⁰F ΔT
5 What does that 6⁰F difference buy us? Chiller Energy Savings: 35, tons 175, tons 350, 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
6 What does that 6⁰F difference buy us? Chiller Energy Savings: 35, tons 175, tons 350, tons Atlanta Dallas Denver Chicago Seattle More Free Cooling Hours Waterside Airside Economizer extra hours extra hours extra hours extra hours extra hours
7 What does that 6⁰F difference buy us? Chiller Energy Savings: 35, tons 175, tons 350, tons Atlanta Atlanta Dallas More Free Cooling Hours Waterside Airside Economizer More Free Cooling Hours Indirect Evaporative Economizer extra hours 2078 extra hours extra hours Dallas 2110 extra hours Denver Denver Chicago extra hours 30 extra hours extra hours Chicago 1151 extra hours Seattle Seattle extra hours 26 extra hours
8 Network Challenges to Airflow Management Cable distribution Cable management Non-standard airflow patterns
9 Cable distribution challenges
10 Cable distribution underfloor 90% increase in average airflow volume per perforated floor tile
11 Cable distribution overhead
12 Cable management within the cabinet Two large switches
13 Cable management within the cabinet Cold air required Cold aisle Hot aisle
14 Cable management within the cabinet Cold air path
15 Cable management within the cabinet: why it is important p = ƒ L ƥv D 2 Hydraulic Diameter = 4A P Pressure (inh2o) In 800mm 700mm cabinet with no large cabling: switch and effective airflow management g ducts: D = CFM 0.2 H 2 O increase in p = 50% decrease in fan throughput
16 Switch Clearances and Airflow
17 Network Switch Airflow Recommended Front Cold Aisle Rear Hot Aisle
18 Network Switch Airflow Not Recommended..but Front Cold Aisle Rear Hot Aisle
19 Network Switch Airflow Not Recommended..but Front Cold Aisle Rear Hot Aisle
20 Network Switch Airflow Not Recommended..but Front Cold Aisle Rear Hot Aisle
21 Network Switch Airflow Not Recommended..but Front Cold Aisle Rear Hot Aisle
22 Network Switch Airflow Not Recommended..but Front Cold Aisle Rear Hot Aisle
23 Side-to-side switch airflow management Hot aisle cold aisle arrangement Chimney cabinet arrangement
24 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
25 Side-to-Front Breathing Switches
26 Rear-to-Front Breathing Switches Inlet Air Switch Exhaust Air
27 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
28 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
29 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
30 QUESTIONS? Ian Seaton Global Technology Consultant On behalf of Chatsworth Products (512)
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