Multiquip MQP50IZ, MQP20IZ Mechanical Installation —Ventilationand Cooling, Engine Cooling

MECHANICAL INSTALLATION —VENTILATION AND COOLING

Engine Cooling

Liquid-cooled engines are cooled by pumping coolant ( a mixture of water and antifreeze) through passages in the engine cylinder block and heads by means of an engine- driven pump. The engine, pump, and radiator (or liquid-to- liquid heat exchanger) form a closed-loop, pressurized cooling system. The most common genset configuration has a mounted radiator and engine-driven fan to cool the coolant and ventilate the generator room. Alternate methods for cooling the coolant include a mounted liquid to liquid heat exchanger, a remote radiator, or a remote liquid-to-liquid heat exchanger. These alternate methods are covered later in this section.

Ventilation and Cooling

Generator Sets create considerable heat that must be removed by proper ventilation. Outdoor installations rely on natural air circulation but indoor installations need properly sized and positioned vents for adequate air flow.

Vents and Ducts

For indoor installations, locate vents so incoming air passes through the immediate area of the installation before exhausting. Install the air outlet higher than the air inlet to allow for convection air movement.

Size the vents and ducts (Figure 24) so they are large	Figure 23. Wind Barrier
enough to allow the required flow rate of air. The "free
area" of ducts must be as large as the exposed area of
the radiator.
Wind will restrict free airflow if it blows directly into the air
outlet vent. If possible, locate the outlet vent so the effects
of wind are eliminated. See Figure 23.

Figure 24. Wind Barrier Installation

PAGE 60 — INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07)