8
Sun Server X3-2L Site Planning Guide • December 2012
■
Ensure that ventilation openings such as cabinet doors, for both the inlet and
exhaust of the server, provide a minimum open area of 35.5 inches
2
(231 cm
2
)
each. This size is equivalent to a 60 percent open area perforation pattern across
the front and rear area of a server that measures 17.4 inches x 3.4 inches (442 mm
x 87.1 mm). You must evaluate the impact of other open area characteristics that
are more restrictive.
■
Ensure that front and rear clearance of the server allows a minimum of 0.2 inches
(5 mm) at the front of the server and 3.15 inches (80 mm) at the rear of the server
when mounted. These clearance values are based on the inlet and exhaust
impedance (available open area) stated earlier and assume a uniform distribution
of the open area across the inlet and exhaust areas. These values also improve
cooling performance.
Note –
The combination of inlet and exhaust restrictions such as cabinet doors and
the spacing of the server from the doors can affect the cooling performance of the
server. You must evaluate these restrictions. Server placement is particularly
important for high-temperature environments.
■
Take care to prevent recirculation of exhaust air within a rack or cabinet.
■
Manage cables to minimize interference with the server exhaust vent.
■
Ensure that air temperature rise through the server is no greater than 68˚F (20˚C).
Related Information
■
“Operating Environment Requirements” on page 6
■
“Optimal Ambient Temperature” on page 7
■
“Optimal Ambient Relative Humidity” on page 7
Heat Dissipation Calculation
To calculate the heat generated by a server so that you can estimate the heat your
cooling system must dissipate, convert the figure for the server’s power requirement
from watts to BTU/hr. A general formula for doing this is to multiply the average
operating power requirement figure in watts by 3.412.
Related Information
■
“Operating Environment Requirements” on page 6
■
“Optimal Ambient Temperature” on page 7
■
“Optimal Ambient Relative Humidity” on page 7
■