Lucht circulatie in Data Centres een Low Speed Ventilation benadering Michiel de Jong, Low Speed...
9
Lucht circulatie in Data Centres een Low Speed Ventilation benadering Michiel de Jong, Low Speed Ventilation GreenIT EIA, Amsterdam, 2015
-
Upload
alexander-richard -
Category
Documents
-
view
214 -
download
0
Transcript of Lucht circulatie in Data Centres een Low Speed Ventilation benadering Michiel de Jong, Low Speed...
Lucht circulatiein Data Centres
een Low Speed Ventilation benadering
Michiel de Jong, Low Speed VentilationGreenIT EIA, Amsterdam, 2015
Low Speed Ventilation – The Netherlands [email protected]
1. To cool the servers, air is needed,
for 1[MW]IT ≡ 70[m3/s](or 2,6M[ton/year])
2. In conventional Data Centres, coolers are small.(money is earned with servers, not with coolers, .. therefore:
maximum space for servers & minimal space for cooling solutions)
3. However, .. small volumes for cooling & huge amounts of air=> high air speed
=> local pressure variations (Venturi-effect)=> ‘Hot spots’ ≡ systemic problem
Hot spots: 1) fans working against pressure 2) hot air flowing back to front
4. Problem conventionally addressed by applying over pressure=> 1) resistance (See pressure profile)
=> fan power & energy=> a) energy costs=> b) maintenance
=> maintenance costs=> downtime risk
=> c) higher investment
=> 2) leakage=> a) more air needed
=> higher speeds, etc
Low Speed Ventilation – The Netherlands [email protected]
5. Getting rid of high air speed1.) <= large cross section area for cooling
=> a) low speed=> no local pressure variations
=> no Hot spots
Low Speed Ventilation – The Netherlands [email protected]
3.) <= air availability : flow measurements instead of pressure control=> simple and predictive measurements
=> feedback for stable control=> control resilient to interruptions
2.) low resistance in the air trajectory=> low fan power
=> a) low energy consumption=> b) low maintenance
Low Speed Ventilation – The Netherlands [email protected]
6. CAPEX & OPEX => OPEX
=> less energy, less maintenance, less disturbances=> lower operational costs (PUE :1.18 => 1.11/1.07)
=> CAPEX=> less electrical infrastructure , less dry coolers, less control devices, less leakage prevention, smaller fans, etc. (5% E & MC)
7. Proven concept=> 4 Data Centres currently working
Low Speed Ventilation – The Netherlands [email protected]
8. SUMMARY
What LSV delivers;
0 Hardware comfort up (no hotspots)0 IT life time up (avoid high temps)0 TIER Reliability up (industrial components/
resilient climate control)0 Air reliability up (climate control based on air availability)0 Investment levels down (savings on E- and C-infrastructure)0 Maintenance down (lower fan speeds / less complex AC)0 Energy consumption down (lower fan power)0 Comfort personnel up (door to hot containment can be left
open during maintenance withoutinterrupting cooling)
Low Speed Ventilation – The Netherlands [email protected]
Alfa Laval – Sweden, Low Speed Ventilation – The [email protected] [email protected]
Air flow required: with PDC is IT power in [W], Cpa is heat capacity of air in [J/kg K], ρa is density of air in [kg/m3] and ΔT is temperature difference between hot & cold air in [K]
Pressure drop due to air speed:
with ΔPa is the pressure drop of the air in [Pa], ρa is the density of air in [kg/m3] and va the air speed in [m/s].
General layout DC with LSV:
APPENDIX
Raised floor/no outside air, Non-raised floor/no outside air, Raised floor/outside air, Non-raised floor / outside air
