
100 LIGHT AND HEAVY VEHICLE TECHNOLOGY
that is, when the rate of heat emission equals the rate
at which heat is generated in the engine.
3 Interior heating for the vehicle is improved because
outside air may be directed through a heat exchanger
matrix, which can be conveniently heated by circu-
lating a portion of the engine coolant through it.
Advantages of air cooling
1 Warm-up of the engine is more rapid because of the
lower specific heat of the air cooling medium; heat is
less readily transferred from the engine metal to the
air being circulated around it, as a result of their
lower mean temperature difference.
2 The system is inherentl