Compaq ProLiant DL320 Ultra-Dense Server Deployment in Compaq Racks

Compaq ProLiant DL320 Ultra-Dense Server Deployment in Compaq Racks 42
13AS-0900A-WWEN
Input Current and Thermal Dissipation Calculations
The input power is necessary for determining the input current and thermal dissipation. For a
given input power, the input current varies depending on the input voltage level.
The relationship among the current, the voltage, and the power for the power supply input is as
follows:
For example,
Input Current = 100 W /110 V = 0.91 A
Input Current = 100 W /208 V = 0.48 A
The thermal dissipation can be calculated from the input power as follows:
For example,
Thermal Dissipation = 100 × 3.41 = 341 BTUs/hour
Thermal Dissipation = 200 × 3.41 = 682 BTUs/hour
The easiest way to calculate the thermal dissipation for the entire rack is to add the input power
requirements for all the servers and other units populated in a rack and then multiply the total
input power by 3.41. The total thermal dissipation helps determine cooling and environmental
requirements for the populated rack.
The following section, “Measured Input Power,” further explains the effects on input power and
thermal calculations from adding or removing subsystem components.
Input Current = Input Power / Input Voltage
Thermal Dissipation = Input Power × 3.41