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2-4 Sun Fire V120 and Netra 120 Server User’s Guide • December 2001
2.3 Estimating Heat Dissipation
To estimate the amount of heat generated by a Sun Fire V120 or Netra 120 server so
that you can estimate the heat your cooling system must dissipate (see Section 2.2,
“Power Consumption” on page 2-3), convert the figure for the server’s power
consumption from watts to BTU per hour.
A general formula for doing this is to multiply the figure for the power consumption
by 3.415. For example, the heat that must be dissipated for a Sun Fire V120 server
containing a 650 MHz processor, a single 36 GB hard disk drive, and a single 512 MB
DIMM is:
58 x 3.415 = 198.07 BTU/hr
You can install up to 32 Sun Fire V120 or Netra 120 servers into a Sun StorEdge 72-
inch rack. To estimate the heat your cooling system must dissipate, add together the
nominal power consumption for each server in the rack, then multiply the result by
3.415. For example, 30 servers each containing a 650 MHz processor, containing a
single 36 GB hard disk and a single 512 MB DIMM will generate the following
amount of heat:
(30 x 58 W) x 3.415 = 5942.10 BTU/hr
What’s Next?
When you have used this chapter to estimate the power and cooling requirements
for your server, go to Chapter 3, which tells you how to assemble the DC input
power cables for the Netra 120 server; or if you are installing a Sun Fire V120 server,
go straight to Chapter 4 to find out how to install the optional hardware components
available for both servers.