Introduction And Assembly; Description Of Humifog; Components In The System; Humifog System Configurations - Carel humiFog multizone User Manual

1.1 Description of humiFog

humiFog is a humidifier and adiabatic cooler that atomises demineralised
water into very fine droplets that evaporate spontaneously in the air,
which is humidified and cooled.
humiFog uses a volumetric pump to pressurise the water, which is
atomised by special stainless steel nozzles.
The sophisticated control system combines the action of an inverter,
which controls the speed and consequently the flow-rate of the pump,
with a series of solenoid valves that activate only the nozzles that are
necessary, allowing the system to always operate at the ideal pressure
to atomise the water, across a wide range of flow-rates (a 5-100 % flow
range working with a constant pressure of 14-100% for operating while
controlling the flow).
The effect of cooling the air is due to the spontaneous evaporation of
the droplets of water: the change in state from liquid to steam occurs by
subtracting energy from the air that, as a consequence, is cooled. Each
kilogram of water evaporated absorbs 0.69 kWh of heat from the air.
humiFog is a complete humidification and/or adiabatic cooling system
that can be used both in AHUs (air handling units) and to humidify or cool
industrial environments by spraying water directly into the environments.
The term zone refers to both AHUs and industrial environments.

1.2 Components in the system

humiFog is made up of:
•
a pumping unit that delivers the water at high pressure (25-70 bars).
It also contains the electronic controller that completely manages the
pumping unit, controlling the temperature/humidity in a zone (either
AHU or environment) and managing any other zones connected to
the pumping unit;
•
The pumping unit can be set to operate:
-
with flow control (maximum precision, minimum energy and water
consumption, only single zone applications);
-
at constant pressure (suitable for multizone applications where one
pumping unit supplies the humidification and/or cooling system in
different zones);
•
distribution and atomisation system: system of pipes carrying the
pressurised water that house the atomisation nozzles and, in general,
the capacity-control solenoid valves and drain solenoid valves;
•
droplet separator (only when installed in an AHU);
•
temperature and/or humidity probes (if necessary);
•
water treatment system: typically this is a reverse osmosis demineraliser
that supplies water with a low mineral salt content to the humiFog.
1.3 humiFog system configurations
The humiFog system can be used in the following configurations:
•
single zone: for humidification and/or cooling applications in a AHU or
an industrial environment;
•
multizone: for applications where one pumping unit (master) is
used to supply multiple zones with pressurised water. The master
will control one zone, in the sense that in relation to the zone probe
readings or the external controller, it will activate and control the
distribution and atomisation system so as to maintain the humidity or
temperature level. All other zones will have a controller (slave electrical
panel) that communicates with the master, and in relation to the zone
probe readings or the external controller will activate and control the
distribution atomisation system so as to maintain the humidity or
temperature level.

1. INTRODUCTION AND ASSEMBLY

One important configuration is for indirect adiabatic cooling applications:
a pumping unit can be used to humidify the air in winter and to cool
the discharged air in summer before it enters a heat recovery unit. This
configuration is explained in detail in the chapters below.
humiFog humidifiers are available for:
•
maximum flow-rates respectively of 100 l/h,(UA100..) 200 l/h (UA200..),
320 l/h (UA320..), 460 l/h (UA460..), 600 l/h (UA600..);
•
type of cabinet: H=single zone master; Z=multizone master; S=slave
cabinet;
•
power supply voltage: D= 230 V 50 Hz; U= 208 V 60 Hz;
•
shows the version of the launched product (1 - 4)
•
damper: 0=without damper; 1=with damper (only versions with 100
and 200 l/h flow-rate)
•
features of the pump and circuits: 0= brass; 1=stainless steel; 2=
stainless steel, silicon free

1.4 Supply water characteristics

Why does humiFog require demineralised water?
Humifog only works with demineralised water, to ensure:
•
minimum maintenance;
•
no blockage of the nozzles;
•
no dust (the droplets that evaporate do not leave mineral salts in the
AHU/environment);
•
more hygiene.
The use of demineralised water is also required by standards such as
UNI8883 , VDI6022, VDI3803
humiFog must only be supplied with treated water, based on the limit
values listed below. In normal circumstances, this means that the water
must be treated using a reverse osmosis system.
recommended supply water characteristics
(**)
bH (pH)
Specific conductivity at 20°C (**) (σR, 20°C) for steel
pump
Specific conductivity at 20°C (**) (σR, 20°C) for brass
pump
Total hardness (**) (TH)
Temporary hardness
Total quantity of dissolved solids (cR)
Dry residue at 180° (R180°C)
Iron + Manganese
Chlorides
Silicon dioxide
Chlorine ions
Calcium sulphate
( * ) values depend on the specific conductivity; in general:
C 0,65 * σ ; R 0,93 * σ
R, 20 °C 180
R
(**) main values to keep in consideration for every type installation.
Important: If the specific conductivity is less than 30 μS/cm, the
stainless steel pump should be used.
(**)
Important: for conductivity values around "0", contact CAREL
INDUSTRIES for operating suggestions.
Caution: for conductivity higher than 1000 μS/cm, it is required to
pre-treat the water before subjecting it to reverse osmosis.
Caution: the pump is able to operate at a maximum temperature of
40°C.
7 "humiFog multizone - pumping
unit of
min. max.
measure
6,5
μS/cm 0
μS/cm 30
mg/l CaCO3 0
mg/l CaCO3 0
mg/l (*)
mg/l (*)
mg/l Fe+Mn 0
ppm Cl 0
mg/l SiO2 0
mg/l Cl- 0
mg/l CaSO4 0
R, 20 °C
unit" +0300066EN - rel. 1.2 - 10.12.2015
ENG
limits
8,5
30
50
25
15
(*)
(*)
0
10
1
0
5
Tab. 1.a