7
ENG
“optiMist” +0300065EN - rel. 1.6 - 18/06/2021
1. INTRODUCTION AND MOUNTING
1.1 optiMist description
optiMist is an evaporative cooler and humidifi er that atomises water in
fi ne droplets which then spontaneously evaporate, removing heat from
the humidifi ed and cooled air.
optiMist uses a vane pump to pressurise the water, subsequently
atomising it through special nozzles.
The sophisticated control system combines the action of an inverter,
which regulates the speed and consequently the fl ow-rate of the pump,
with two solenoid valves that activate only the necessary nozzles,
allowing the system to always work at the ideal pressure to atomise the
water, across a wide range of fl ow-rates.
The eff ect of cooling the air is due to the spontaneous evaporation of
the droplets of water: the change in state from liquid to vapour occurs by
subtracting energy from the air that, as a consequence, is cooled.
Each kilogram of water evaporated absorbs 0.69 kW of heat from the air.
optiMist is a complete evaporative cooling and humidifi cation system
that can be used to treat the air in an AHU (air handling units) and to
both humidify and to indirectly cool the renewal air, in order to increase
the energy effi ciency of the AHU.
1.2 Components of the system
optiMist is comprised of
•
a pumping station that pressurizes the water (4-15 bar). It also contains
the electronic controller that completely manages the pumping
station, controlling the temperature/humidity in each section. Since it
is equipped with an inverter and pressure sensor, it manages to control
the fl ow of water produced at any moment, thus ensuring maximum
precision and minimum energy and water consumption.
•
distribution and atomisation system of pipes for transporting the
pressurised water, which contain the atomisation nozzles and drain
valves;
•
droplet separator;
•
temperature and/or humidity probes or control through external
signal;
•
water treatment system: typically this is a reverse osmosis demineraliser
that supplies water with a low mineral salt content to the optiMist.
1.3 Confi guration of the optiMist system
The optiMist system can be confi gured to:
1.
Control the air humidity, installing a pumping station and a distribution
system (with two-step modulation) in the AHU humidifi cation
section.
Fig. 1.a
2.
Control indirect evaporative cooling (IEC) by installing a pumping
station and a distribution system (with two-step modulation) in the
upstream section of the AHU heat recovery unit.
Fig. 1.b
3.
Control both humidifi cation and evaporative cooling with a pumping
system that will serve the two distribution systems, each with one-
step modulation.
Fig. 1.c
The confi guration for indirect evaporative cooling applications is of
particular importance. Besides humidifi cation of the air in the winter,
optiMist can be used in the summer to cool the discharged air in the
summer before it enters a heat recovery unit.
This confi guration is explained in the detail in the chapters below.
optiMist humidifi ers are available for:
•
fl ow-rates: 50 l/h (EC005...), 100 l/h (EC010...) 200 l/h (EC020..), 400 l/h
(EC040..), 800 l/h (EC080..) and 1000 l/h (EC100..);
•
power supply voltage: D = 230 V 50 Hz; U= 230 V 60 Hz;
