Heat generated by a HP ProLiant DL380p Gen8 entry EU servers

This depends on your usage pattern, but I think your 2.432 kW number may be overkill.

In terms of your room's ambient temperature, the thresholds of the DL380p platform are:

Ambient temps warn at 42°C
Thermal shutdown occurs at 46°C.

This can be overridden/ignored, but that's a target to keep in mind. Here's the heat map and spot temperatures for a very busy DL380p Gen8 system described in detail below.

enter image description here

The BTU figure you see from the HP Quickspecs is a maximum, but we know that you won't be running these servers at full utilization. In a SMB scenario, It doesn't make sense to engineer for worst-case power/heat loads. These are extremely efficient servers and I've had success running them in less-than-ideal environments (warehouses, closets, bathrooms...)

However, HP does say: BTU = Volts X Amps X 3.41, so your calculation is correct.

Real-life power utilization figures...

For a DL380p with that spec (or slightly more powerful E5-2620 single-CPU configuration), with a light duty cycle I see:

System Information
        Manufacturer: HP
        Product Name: ProLiant DL380p Gen8

model name  : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
cpu MHz     : 2000.000

hpasmcli> SHOW POWERMETER
Power Meter #1
    Power Reading  : 62

hpasmcli> SHOW POWERSUPPLY
Power supply #1
    Present  : Yes
    Redundant: Yes
    Condition: Ok
    Hotplug  : Supported
    Power    : 35 Watts
Power supply #2
    Present  : Yes
    Redundant: Yes
    Condition: Ok
    Hotplug  : Supported
    Power    : 35 Watts

For an extremely busy DL380p Gen8 with TWO E5-2643 v2 3.5GHz CPUs, running with a 8 internal SAS disks, 192GB RAM, fully-populated PCIe slots and no power saving settings enabled, I see:

enter image description here