Kohler Generator Sets 20--2800 kW User Manual download pdf (Page 23)

TP-5700 7/93 11Section 4 Air Requirements

Section 4 Air Requirements

4.1 General

An ample flow of clean, cool air is required to support

combustion and dissipate heat. Approximately 70% of

the heat value of fuel consumed by an engine will be

rejected to the cooling system and exhaust.

Battery compartment ventilation. To prevent the

accumulation of explosive gases, ventilate

compartments containing batteries.

If a generator set is to be located in a building or enclosure,

make certain that adequate air intake and air outlet

openings are provided. If air flow provided by the

engine-generator cooling fan is not sufficient to prevent

excessive temperatures, other means such as ductwork

and/or ventilating fans will have to be used to provide

adequate air flow. If an exhaust fan is used, (Figure 4-1

and Figure 4-2) check the fan’s capacity in cubic feet

(cubic meters) per minute. Follow the fan manufacturer’s

recommendations to determine the size of the inlet and

outlet openings.

In certain cold climate applications, controlled

recirculation may be used as a means of heat recovery;

however, special equipment such as thermostatically

activated louvers and fans are needed to prevent engine

and engine room overheating. The uncontrolled

recirculation of heated air within an enclosure must be

prevented. Otherwise, the temperature in the enclosure

quickly rises to a point where efficient cooling is no longer

possible. With a properly designed ventilation system, a

sufficient temperature differential is not hard to

maintain—even on the hottest days. Make certain air

inlets and outlets cannot be blocked by snow. Air inlets

and outlets should also be kept clean and unobstructed

at all times. The direction of the prevailing wind should be

considered when positioning outlets. If wind velocity is

considerable, it tends to cancel the effects of the engine

or exhaust fan. When strong prevailing winds are

anticipated, face the air inlet into the wind and the outlet in

the opposite direction. See Section 4.6, Liquid-Cooled

Models, for additional suggestions.

Figure 4-1 Exhaust Fan-Operated Louvers (fan not

shown)

Figure 4-2 Fans Required On Some Installations

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Kohler Generator Sets 20--2800 kW User Manual Page 23

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