Calculating System Thermal Output - Juniper MX204 Hardware Manual

Table 27 on page 71 lists the power requirements for the fully configured AC-powered routers operating
under typical voltage conditions.
Table 27: MX204 Router AC Router Power Requirements at Typical Temperature (25° C)
Chassis Configuration
Fully configured chassis running at high activity
Table 28 on page 71 lists the power requirements for the fully configured AC-powered routers operating
under maximum voltage conditions.
Table 28: MX204 Router AC Router Power Requirements at Maximum Temperature (55° C)
Chassis Configuration
Fully configured chassis running at high activity

Calculating System Thermal Output

After you have calculated the power consumption for your configuration, you can use that information to
determine the system thermal output (BTUs per hour). To do so, multiply the power consumption in watts
by 3.41.
For example, in Table 27 on page 71
high activity at 25° C typical temperature to be 240 W. Using that information we can calculate the system thermal
output for the configuration:
Power consumption in watts * 3.41 = system thermal output in BTU/hr
240 W * 3.41 = 818.4 BTU/hr
SEE ALSO
MX204 Power System Description | 33
Replacing an MX204 AC Power Supply | 128
AC Power Cord Specifications for MX204 Routers | 40
Power Requirement at 25°
C (Watts)
240 W
Power Requirement at 55°
C (Watts)
280 W
we calculated the power consumption for a fully configured chassis running at
Power Requirement
(Watts) with 90%
Efficiency
266 W
Power Requirement
(Watts) with 90%
Efficiency
311 W
71