Page 212 - Handbook of Energy Engineering Calculations

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installed indoors. Thus, a 60-kW set requires 390 ft /min (11.0 m /min) for
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combustion and 6000 ft /min (169.9 m /min) for the radiator. Note that in the
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smaller ratings, the combustion air needed is 6.5 ft /(min · kW) (0.18
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m /kW), and the radiator air requirement is 150 ft /(min · kW)(4.2 m /kW).
TABLE 4 Total Air-Volume Needs *

2. Determine maximum permissible air temperature rise
Table 4 also shows that with an ambient temperature of 95 to 105°F (35 to

40.6°C), the maximum permissible room temperature rise is 15°C (8.3°C).
When you determine this value, be certain to use the highest inlet-air
temperature expected in the engine locality.

3. Determine the heat radiated by the engine
Table 5 shows the heat radiated by typical internal-combustion engine

generating sets. Thus, a 60-kW radiator- and fan-cooled set radiates 2625
Btu/min (12.8 W) when the engine is fitted with a 25-ft (7.6-m) long exhaust
pipe and a silencer.

TABLE 5 Heat Radiated from Typical Internal-Combustion Units,

Btu/min (W) *