Page 417 - Handbook of Energy Engineering Calculations

1800 to 2200 Btu/(bhp · h) (0.71 to 0.86 kW/kW). Using the higher value, we
see the jacket-water heat rejection by this engine is (1000 bhp)[2200 Btu/(bhp
· h)] = 2,200,000 Btu/h (644.8 kW).

2. Determine the jacket-water temperature rise
DEMA reports that a water temperature rise of 15 to 20°F (8.3 to 11.1°C) is

common during passage of the cooling water through the engine. The
maximum water discharge temperature reported by DEMA ranges from 140
to 180°F (60 to 82.2°C). Assume a 20°F (11. 1°C) water temperature rise and
a 160°F (71.1°C) water discharge temperature for this engine.

TABLE 3 Approximate Rates of Heat Rejection to Cooling
Systems *

3. Determine the air inlet and outlet temperatures
Refer to weather data for the locality of the engine installation. Assume that

the weather data for the locality of this engine show that the maximum dry-