Sun Microsystems Netra t1 100, User And Administration Manual

Page: 32 / 154

10 Netra t1 User and Administration Guide • June 2000
Example B
The power requirement for a Netra t1 system operating at 65% PSU efficiency and
containing:
■
440 MHz CPU
■
1 Gbyte RAM
■
Two 18 Gbyte disk drives
■
CD-ROM drive
is calculated as follows:
Note – To calculate the total power requirement for several Netra t1 systems
installed in a single rack or cabinet, add together the individual power requirement
figure (
TABLE 2-2
) for each Netra t1 you have installed.
Calculating the Heat To Be Dissipated
To calculate the heat generated by a Netra t1 system so that you can estimate the
heat your cooling system must dissipate, convert the figure for the system’s power
requirement (see “Calculating the Power Requirements for your Netra t1” on page 9)
from watts to BTU/hr. A general formula for doing this is to multiply the figure for
the power requirement by 3.415. For example, the heat that must be dissipated for
the system in:
■
Example A is 92.28 x 3.415=315.14 BTU/hr
■
Example B is 108.4 x 3.415=370.19 BTU/hr
What’s Next?
When you have used this chapter to calculate the power and cooling requirements
for your Netra t1 system, go to Chapter 3 which tells you how to assemble the DC
input power cables for the Netra t1 Model 100, or, if you are installing a Model 105
system, go straight to Chapter 4 to find out how to install the optional hardware
modules available for the Netra t1.
36.3 0.21 16
× ( )
13.8 2
× ( )
3.2 + + +
0.65
-----------------------------------------------------------------------------------------
108.4W =
SysAdmin.book Page 10 Friday, March 30, 2001 2:38 PM