Page 32 - Uninterruptible Power Supplies

Standby Power Generating Sets
30 Chapter One

4

5 3 2 6
1

Plan

4

3
5 1 2 6

Elevation
1. Engine 5. Radiator with engine
2. Generator or motor driven fan
3. Combustion air intake 6. Air inlet-fan may not be
4. Exhaust system necessary
Figure 1.11 Typical arrangement for a local radiator-cooled diesel
engine–driven generating set.

and the arrangements for turbine air inlet and exhaust are much
larger than for a diesel engine, the layout will be constrained by the
turbine design. Figure 1.14 indicates a typical arrangement for a gas
turbine–driven generating set.

Direction of Airflow
The airflow within the engine room should preferably be arranged to be
in the direction from the generator to the engine and radiator; this
allows the generator to receive a supply of clean cool air. The generator
produces only a small amount of heat and is cooled by a flow of cooling
air which exits as clean warm air. The engine on the other hand pro-
duces a large amount of heat and various surfaces tend to produce oily
vapor which would adversely affect the generator windings.

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