Building automation – impact on energy efficiency - Siemens ...

Remarks of Siemens
This section outlines how Siemens interprets the functions and processing
functions according to EN 15232:2012.
7. If the ventilation system serves only one room and is controlled to the indoor
temperature of that room, use "7.4 Heating and cooling control", even if the
control acts on the supply temperature. In the other cases, the types of
available controls must be differentiated.
Exercise care when using this type of temperature control, unless the
system is designed to prevent simultaneous heating and cooling.
8. An air washer that has a humidification efficiency of at least 95%, i.e. one
that can almost achieve the saturation of the escaping air is required for
dew point control. If the temperature of this nearly saturated air is also controlled,
its water vapor content is fixed. Therefore, the required effort in
terms of control equipment is relatively small. This solution is appropriate in
applications where the air that has been cooled to the dew point is largely
reheated by internal heat sources in the conditioned space. If this is not the
case, direct humidity control is – for energy efficiency reasons – preferable
for conventional air conditioning systems.
9. In the case of water spray humidification, a humidification efficiency that is
considerably lower than that of the dewpoint air washer suffices. This
means that a lower priced device can be used accordingly. It is, however,
important for the humidifier to be controlled within a sufficiently large output
range.
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