A-10
Engineering Guide CDA3000
Appendix A Formula bank
k
C11
Specific basic cutting force for face cross-section 1 mm x 1 mm
k
C
Specific cutting force for various face thicknesses h
p Total pressure N/m²
P Drive capacity kW
Q
F
Delivery m³/s
V Specified throughput kg/h
γ Specific drive power kWh/kg
η Fan efficiency/pump efficiency
For fans:
η ≈ 0.3 at 1 kW
η ≈ 0.5 at 10 kW
η ≈ 0.65 at 100 kW
The following table shows the specific drive power for various thermo-
plasts:
Drive capacities in process engineering
Fan
Pump
Extruder
Table 7.8 Drive capacities in process engineering
Thermoplast
Specific drive power
in kWh/kg
ABS 0,2 to 0.3
CAB 0.1 to 0,2
Table 7.9 Specific drive power for various thermoplasts
Drive capacities in
process engineering
P
Q
F
p⋅
η
------------=
P
Q
F
p⋅
η
------------=
PVϒ⋅=
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