SINAMICS S120 Cabinet Modules
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
465/528
7. Calculating the power loss that can be transferred from the deionized water circuit to the raw water circuit
With the maximum raw water inflow temperature of 30 °C specified for this example, the power loss (cooling capacity)
P
L deion raw
that can be transferred from the deionized water circuit to the raw water circuit can be calculated from the
rated cooling capacity P
HEM rated
of the Heat Exchanger Module selected above and from the inflow temperature in the
deionized water circuit T
in deion
and the inflow temperature in the raw water circuit T
in raw
as follows:
P
L deion raw
= P
HEM rated
• (T
in deion
– T
in raw
) / 7 °C = 72 kW • (40 °C – 30 °C) / 7 °C = 103 kW.
The 103 kW power loss that can be transferred to the raw water circuit is significantly higher than the 58.2 kW total
power loss of the drive line-up calculated above. The total power loss can therefore be dissipated without any
difficulties.
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