The Internet abounds with information on the topic of thermal output.
I’ve collected the following formulas and placed them here for my quick reference.
Watts

=

0.293

*

BTUHr

Watts

=

3,530

*

Tons

BTUHr

=

3.41

*

Watts

Tons

=

0.000283

*

Watts

For example,
 PacketLight PL1000TN Optical Transport Unit PSU rated at 70 watts is
238.7 BTUHr = 3.41 * 70 watts
 HP ProLiant DL120 Generation 7 (G7) PSU rated at 570 watts is
1943.7 BTUHr = 3.41 * 570 watts
 Dell PowerEdge R410 Rack Server with NonRedundant PSU rated at 480 watts is
1636.8 BTUHr = 3.41 * 480 watts
Volts will change the wattage; consider the following calculation.
Power (watts) = Voltage (volts) * Current (amperes)
If you are looking for information on sizing the thermal footprint of a datacenter there are other factors to take into consideration in addition to server and network equipment.
For example,
 People (see note 1)
 Lighting
 Powered devices (nonIT gear)
 Windows (sun light)
 Heat conduction via exterior (outside) facing walls
 Raised/nonraised floor
 Humidity
When I set out to research the formula for determining a system’s thermal output I found myself caught up in the additional information I came across. To me that’s like finding $5 bill in my pocket.
Note 1
There is general agreement that the human body will produce ~100 watts. The following link has a brief discussion on the topic – interesting I thought.
http://hypertextbook.com/facts/2003/WeiLiangMok.shtml
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