Bitte wählen Sie ihr Lieferland und ihre Kundengruppe
When a pressure-charged diesel engine is used in rail traction or other applications in which the charge air, when cooled at all, is ultimately cooled by atmospheric air, the temperature of the air entering the cylinders is necessarily above the ambient air temperature. Apart from any effect of atmospheric pressure, the rated power output of any given engine is then governed by the ambient air temperature, the engine being progressively derated with increasing air temperature. If a refrigerator is used to cool the charge air to below ambient temperature, the rated power output of the engine may be increased. For this purpose, the compression type vapour cycle refrigerator appears to be the most suitable. By using it to cool the charge air to as low a temperature as is practicable, after heat has been extracted from it by a conventional charge air cooler, savings in overall bulk, cost and weight of an engine with refrigerator can be achieved compared with a larger unrefrigerated engine developing the same power.