Lowara GEMK Serie Instrucciones Para La Instalación Y El Uso página 86

3.11 Ventilation
Adequate ventilation of the room in which the diesel engine pump is installed is very important for correct operation.
It must:
- dissipate the radiative heat generated by the motor while running.
- ensure the inlet air flows properly and in a sufficient quantity to allow diesel engine combustion.
- cool the engine through the radiator (for water-cooled engines with radiator) or through the engine fan (for air-cooled engines
or with water-water exchangers).
For optimal operation, therefore, the air must enter through an opening with a fixed safety grille.
The minimum size of the air inlet and outlet apertures must be calculated according to the sum of the air
ATTENTION
flows required for cooling and combustion, considering also the radiation power of the diesel engines.
Consider also the electric motors, when applicable, and calculate the amount of air required.
To achieve the correct air flow, the fresh air is delivered through apertures located at the bottom of the room and, whenever
possible, on the opposite side, so that the air flows around the entire engine before being expelled from the room.
The air flow must also be correct for air-cooled diesel engines or for diesel engines fitted with water-water exchangers. Where
necessary, a forced air extraction system must be installed, guaranteed in the absence of mains power for a time required for
the fire-fighting system, and which starts simultaneously with the diesel engine.
A valid ventilation solution, suitable for most cases (water-cooled engines with radiator), is shown in figure 1, where the engine
fan sucks the cooling air from the room while the hot air is expelled through the radiator and vented outdoor.
The hot air from the radiator must not be allowed back into the room; therefore, you must make sure that
ATTENTION
the air vent is properly isolated and sealed (solution valid for water-cooled engines with radiator). This
way, continuous air exchange in the room is guaranteed.
In environments containing airborne particles, install pre-filtering systems to prevent clogging of the
radiator filters.
The fresh air needed to ensure proper air flow is delivered through openings located at the bottom of the
room and, whenever possible, in the wall opposite the radiator, so that the fresh air flows around the
entire engine before being expelled by the fan.
For safety purposes, in the case of continuously operating diesel pumps installed in an enclosed environment, and for
applications with high ambient temperatures, you should make sure that the cooling air reaching the radiator does not exceed
the admissible temperature for the radiator. If the temperature of the air reaching the radiator needs to be lowered, we
recommend using an auxiliary extractor fan whose capacity must be calculated using the same formula utilized for verification,
adopting the maximum ΔT value that enables proper operation of the radiator based on the values declared by the engine
manufacturer. Position the extractor fan higher up on the same wall through which the vent discharges the hot air; the extractor
must guarantee a head exceeding the vacuum created in the room by the radiator fan.
Anti-vibration
joints
Insulated
silencer
86
Expansion
coupling