Transcript Elevator pitch presentation Low Speed Ventilation

Lucht circulatie
in Data Centres
een Low Speed Ventilation benadering
Michiel de Jong, Low Speed Ventilation
GreenIT EIA, Amsterdam, 2015
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
Low Speed Ventilation – The Netherlands
[email protected]
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 speed
1.) <= large cross section area for cooling
=> a) low speed
=> no local pressure variations
=> no Hot spots
Low Speed Ventilation – The Netherlands
[email protected]
2.) low resistance in the air trajectory
=> low fan power
=> a) low energy consumption
=> b) low maintenance
3.) <= air availability : flow measurements instead of pressure control
=> simple and predictive measurements
=> feedback for stable control
=> control resilient to interruptions
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
0
0
Hardware comfort
IT life time
TIER Reliability
up (no hotspots)
up (avoid high temps)
up (industrial components/
resilient climate control)
0
0
0
0
0
Air reliability
Investment levels
Maintenance
Energy consumption
Comfort personnel
up (climate control based on air availability)
down (savings on E- and C-infrastructure)
down (lower fan speeds / less complex AC)
down (lower fan power)
up (door to hot containment can be left
open during maintenance without
interrupting cooling)
Low Speed Ventilation – The Netherlands
[email protected]
Fragen?
Question?
Dank voor uw aandacht
Low Speed Ventilation – The Netherlands
[email protected]
APPENDIX
Air flow required: 𝛷𝑙 =
𝑃𝐷𝐶
𝐶𝑃𝑎 𝜌𝑎𝑙 𝛥𝑇
Pressure drop due to air speed:
1
𝛥𝑃𝑎𝑙 = 2 𝜌𝑎 𝑣𝑎2
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]
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:
Raised floor/no outside air,
Non-raised floor/no outside air, Raised floor/outside air,
Alfa Laval – Sweden,
[email protected]
Non-raised floor / outside air
Low Speed Ventilation – The Netherlands
[email protected]