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 |
* |
BTU-Hr |
|
Watts |
= |
3,530 |
* |
Tons |
|
BTU-Hr |
= |
3.41 |
* |
Watts |
|
Tons |
= |
0.000283 |
* |
Watts |
For example,
- PacketLight PL-1000TN Optical Transport Unit PSU rated at 70 watts is
238.7 BTU-Hr = 3.41 * 70 watts - HP ProLiant DL120 Generation 7 (G7) PSU rated at 570 watts is
1943.7 BTU-Hr = 3.41 * 570 watts - Dell PowerEdge R410 Rack Server with Non-Redundant PSU rated at 480 watts is
1636.8 BTU-Hr = 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 (non-IT gear)
- Windows (sun light)
- Heat conduction via exterior (outside) facing walls
- Raised/non-raised 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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