Working Principle - Elsteam HPN Series User, Installation And Maintenance Manual

HighPressure Humidifier - Constant Pressure 21.1.EN 5

4 Working principle

The high-pressure humidifier performs an adiabatic humidification by atomization of softened water or
standard water at high pressure.
The system is composed by a central unit, a network control unit (HPNCTRL), a distribution rack and the
droplet separator (at the end of the humidification section, only for AHU installation).
The central unit maintains the pressure in the distribution network at a constant value (established based
on the model of nozzles used) as the number of active network sections varies.
The HPNCTRL, for proportional control of the distribution network, is installed in the environment to be
humidified or inside the AHU, managing section solenoids to make proportional production and
feed/drain solenoids to activate/empty the distribution network. One HPNCTRL must be installed for each
zone to control. The HPNCTRL card receive proportional or ON/OFF signal from the controlling system
and provide signals to the distribution networks solenoids and to the central unit. The HPNCRTL unit
opens the drain solenoid to empty the distribution rack when the control signal is 0.
The droplet eliminator is used to stop the droplets of water that are not completely evaporated before
they enter in the duct.
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