Technical documentation
Subject to modifications
40 of 131
4.4.1. Installation conditions
of the cogeneration plant
For the operation of the Hoval combined heat and power plants, the relevant standards
must be observed.
4.4.2. Combustion air
The necessary engine combustion air is drawn in either depending on or independently
from the room air. For example, air from the machine room can be drawn in as combustion
air for the gas engine. Corresponding ventilation of the boiler room must be ensured by
the customer. The machine room ventilation in a Hoval combined heat and power plant
must be designed in such a way that an opening of at least 30 x 30 cm to the outside
ensures the necessary air exchange. Also, any baffles required over the ventilation
openings must be installed on site.
There must be no sources of pollutants in the machine room (ammonia compressors for
refrigeration or similar). The combustion air must meet the following requirements:
Free from pollutants (in particular, free from ammonia and chlorine)
Air temperature as constant as possible within the range 10 °C - 35 °C with low
temperature fluctuations.
CAUTION
Engine damage!
Ammonia and chlorine in the intake air can damage the engine and shorten the service
life of the lubricating oil. No air containing ammonia or chlorine may be sucked into the
intake line.
If the air from the interior does not meet these requirements, the intake line must be
moved to the outside. The power of the plant is inversely proportional to the temperature
of the combustion air and the altitude of the machine location (in metres above sea level).
NOTICE!
Fresh air ducting
The outside air flow must not be led directly to the front of the air filter, so that the cold
outside air can be mixed with the warmer air in the machine room at low outside
temperatures.
4.4.3. Extract air
The extract air emitted by the plant is technically clean air. The values of CO and CO2 in
the exhaust gas of Hoval combined heat and power plants are CO max. = 120 ppm , CO2
= 11,80 %.
Please contact the Hoval technicians if the exhaust gas values are out of range !
The exhaust gases from the gas engine are directed away in the exhaust system under
positive pressure. The mass flow is approx. 85 m³/h (at 20 kW
el
).
