50
BA053101-en
Example for calulation at dynamometers V
t
= V
h
x (t in °C:273 Kelvin) x
λ
λ
= Supply degree of 0.85 (without Turbocharger)…approx. 1.9 (depending on engine and
manufacturer)
Example 1
Example 2
Car dyno,
Engine 5.547 liter,
Engine speed 5000 rpm,
Temperature 500°C,
λ
= 1.0
Truck dyno,
Engine 18.273 liter,
Engine speed 2300 rpm,
Temperature 500 °C,
λ
= 1.5
V
t
= 5.547 x 5000 x 0. 0363 x 1.2 x 500/273
x 1.0
V
t
= 18.273 x 2300 x 0,.0363 x 1.2 x 500/273
x 1.5
V
t
= 2212.71 m³/h
V
t
= 5029.49 m³/h
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6.2.3
Fresh Air Supply for the Test Room
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According to currently effective regulations in the Federal Republic of Germany, the air must be
renewed 10 to 15 times per hour in closed testing rooms with a surface area up to 100 m².
The air must be renewed 5 to 8 times per hour in rooms over 100 m².
An air throughput of approx. 5000 m³/h is required for a surface area of 100 m².
An inadequate fresh-air supply increases the burden on the test personnel and distorts the test
results.
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