HP ProLiant DL380 Compaq ProLiant DL380 Generation 2 Server High-Density Deplo - Page 39

Compaq ProLiant DL380 Generation 2 Server High-Density Deployment in Compaq Racks 39 Compaq Confidential - Need to Know Required 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: Input Current = Input Power / Input Voltage 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: Thermal Dissipation = Input Power × 3.41 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. Measured Input Power Table 18 lists the measured input power of the ProLiant DL380 Generation 2 server with varying subsystem components to illustrate the effects of adding or removing optional components. The "typical" input power values were measured during idle/normal operations. Table 18. Measured Input Power for Selected Server Configurations Configuration Number 1 2 ProLiant DL380 Generation 2 Server Configuration 1x1.13-GHz, 2 x 128 MB, 0x HDD (minimum/base configuration) 2 x 1.26-GHz, 6 x 1-GB, 6 x 36-GB, 3 x 10 W PCI Load Cards (maximum tested configuration) Typical Power Input 226 W 421 W 14UH-0701A-WWEN