FENDT 938 Vario MT - Page 45

Engine output depending on fuel quality
Dierent fuel qual
ities like temperature, density
and viscosity aect the actual output of the
engine. Our outputs are specified by fuel with a
density of 0.84 kg/dm3 and specific heat rate of
42,7 Mj/kg at a fuel temperature of +15°C.
The correction in % caused by the change of fuel
qualities is seen in the attached figures.
FIG. A. Engine output dependence on fuel
temperature. +35°C is the reference temp
(correction 0%). The fuel temperature is not only a
function of ambient conditions but also varies
according to the fuel system of the application
(tank size and location, return flow etc.).
FIG. B. Engine output dependence on fuel density.
Normal value is 0,84 kg/dm3 at +15°C.
FIG. C. Engine output dependence on fuel
viscosity. Normal value is 3 cSt at +20°C.
Note figure B and C only if the fuel quality is
changed.
In fig. A there are all the quality dependencies
caused by the change of the temperature. The fuel
density and viscosity can be seen in the produce
declaration given by the manufacturer.
The output correction is made as follows:
Correction percentages from figures A, B and C
are summed up. The given rated power is then
corrected with the resulting percentage.
GUID-12BEA2B2-6EB4-428A-A81F-9B5E9B27B324-low.jpg [Low]
Fig. 36
GUID-00C3A26A-88D6-4F74-8677-DEA36BEFF43F [V1]
1. General
1-42 R
ubber Track Tractor
79037495A