VMAC – Vehicle Mounted Air Compressors
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T1 = 58F Current ambient temperature (Average from Form 2)
T2 = 124F Cooler intake temperature (Average from Form 2)
T3 = 100F Maximum expected ambient temperature that the truck
will see
Duty Cycle = 20% See Section 5.1
No. of speeds: 1 or 2 (Circle one)
Tmax = 151F See Table 4
Tx = T3+T2-T1 The expected cooler intake temperature at maximum
ambient temperature
Tx = _100_+_124_-_58_ = _166F_
Tmax = _151F_ & Tx = _166F_ If Tmax is greater than or equal
to Tx, the ventilation is OK. If Tmax is less than Tx, more ventilation
is required, or the duty cycle must be reduced when the ambient air
temperature is greater than:
T3-(Tx-Tmax) = _100_ - (_166_ - _151_) = _85F_
Conclusion: Ventilation must be increased or the duty cycle reduced
when the ambient temperature is greater than 85F
Table 5 – Example Ventilation Analysis
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