Page 201 - Handbook of Energy Engineering Calculations

required power output.

Related Calculations. Use this procedure to select any type of reciprocating
internal-combustion engine using oil, gasoline, liquefied -petroleum gas, or
natural gas for fuel.

HIGH-TEMPERATURE AND HIGH-ALTITUDE I-C ENGINE

PERFORMANCE

An 800-hp (596.8-kW) diesel engine is operated 10,000 ft (3048 m) above
sea level. What is its output at this elevation if the intake air is at 80°F
(26.7°C)? What will the output at 10,000-ft (3048-m) altitude be if the intake
air is at 110°F (43.4°C)? What would the output be if this engine were
equipped with an exhaust turbine-driven blower?

Calculation Procedure:

1. Compute the engine output at altitude
Diesel engines are rated at sea level at atmospheric temperatures of not more
than 90°F (32.3°C). The sea-level rating applies at altitudes up to 1500 ft

(457.2 m). At higher altitudes, a correction factor for elevation must be
applied. If the atmospheric temperature is higher than 90°F (32.2°C), a
temperature correction must be applied.
Table 2 lists both altitude and temperature correction factors. For an 800-
hp (596.8-kW) engine at 10,000 ft (3048 m) above sea level and 80°F

(26.7°C) intake air, hp output = (sea-level hp) (altitude correction factor), or
output = (800)(0.68) = 544 hp (405.8 kW).

TABLE 2 Correction Factors for Altitude and Temprature