Abstract
The basis of existing national and international standards for derating naturally aspirated and turbo-charged diesel engines for temperature, altitude, and humidity is recapitulated. The effect of site ambient conditions on the permissible rating of modern turbo-charged and charge-air cooled engines, with fixed and rematched turbo-chargers, is discussed. The effect of turbo-charger and charge-air cooler limitations on the engine rating is examined, including the use of air-to-air charge cooling. Consideration is given to the installation details which affect the engine performance, e.g. air-intake temperature, cooling water, etc.
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