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Capacity of hydrostatic pump
1,0
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
0,0
0%
10%
20%
By-pass principle
Voith flow system
Saving
30%
40%
50%
60%
Fan speed
Fig. 5: Hydrostatic fan drive during traction, comparison of by-pass
principle and Voith flow system.
70%
80%
90%
average savings in annual cycle approx. 10%
engine output this may correspond to
7,200 l of fuel per year (table 2).
Some of the advantages of hydrodynamic
drives mentioned above also
apply to the hydrostatic drive:
- constant operating temperature of
cooling circuits,
- adapted power requirement, and
-a self-sufficient system.
In addition to this, the fan speed can
now be freely selected within a wide
range.
100%
Water
Electronic
control
Diesel
engine
Oil
Particularly advantageous, however, are
the high power density and the possibility
to expand the system to drive components
such as compressors or generators
at a constant speed. For the latter
this is done using purely hydraulic control
with an accuracy of ± 2.5 % (fig. 6).
Assumption:
Generator
Compressor
Cooler
group
Fig 6: Hydrostatic drive of several components by a multiple pump unit.
• max. pump drive power 100 kW
• mean power savings 10 kW
• 3,000 operating hours per year
Energy savings: 10 kW * 3 000 h/Jahr = 30 000 kWh/year
Fuel savings: 30 000 kWh * 200 g/kWh = 6 000 kg/year
Table 2: Energy- and fuel savings
6 000 kg / 0.83 kg/l ≈ 7 200 l/year
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