Kohler 20--2800 kW manual Air-Cooled Generators

In many installations it may be desirable to install louvers in the inlet and outlet openings. Louvers may be either stationary or movable. In areas of great temperature variation, it is often best to install movable louvers that can be thermostatically adjusted to regulate air flow and room temperature. See Figure 4-3 and Figure 4-4.

If the set is to be installed in an atmosphere highly contaminated with impurities such as dust, chaff, etc., it may be necessary to install a filter in the inlet opening. Furnace-type filters have been very satisfactory. Again, a certain amount of air flow is lost that must be compensated for by increasing the size of the opening.

The following are minimum air inlet and outlet recommendations:

1.If louvers are used, the size of the opening should be increased approximately 50%.

2.If window screening is used, the opening should be increased approximately 80%.

3.If furnace filters are used, the opening should be increased 120%.

4.2 Air-Cooled Generators

Air-cooled generator sets are available with three basic types of air cooling systems that are discussed separately on the following pages. For air-cooled models 4 kW and smaller, size the air inlet and outlet openings at least 1 square foot (0.092 m2). For larger sets determine inlet and outlet size on the basis of 0.25 square feet (0.023 m2) for each 1000 watts of capacity. A 5000-watt set, for example, requires inlets and outlets of 1.25 square feet (0.115 m2) each:

0.25cu. ft. x 5 kW = 1.25 cu. ft. (0.023 m2 x 5 kW = 0.115 m2)

Air requirements are listed in each model’s specification sheet. Remember to increase the size of openings for louvers, screens, filters, etc. as described earler in this section.

Figure 4-3 Stationary Louvers for Air Inlet

Figure 4-4 Movable Louvers For Air Inlet

12 Section 4 Air Requirements TP-5700 7/93