HP BladeSystem Family - Critical Facilities Round Table
HP BladeSystem Family - Critical Facilities Round Table
HP BladeSystem Family - Critical Facilities Round Table
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Fans<br />
• Fan Laws<br />
− Volume of air flow varies as (fan diameter)³ and as rpm<br />
− Pressure developed varies as (fan diameter)² and as (rpm)²<br />
− Power absorbed by the fan varies as (fan diameter) 5 and as (rpm)³<br />
− Sound pressure varies as (air speed) 6<br />
• Fan Concepts<br />
− Pressure<br />
− Airflow<br />
• Significant Tradeoffs have to be made<br />
− Larger fans move more air but take more power<br />
− Smaller fans need higher rpm to move the same amount of air<br />
− Higher rpm means higher noise for a given size fan<br />
− There are physical limits on how fast a fan can go<br />
− More fans = more power and more cost
Change language