Alfa Laval HEV Series General Information

HEV
Door Curtains
General information & application
HEV door curtains are equipped with a water coil and gener-
ate a downward flow of warm air for a comfortable working
conditions in draughtfree surroundings with even tempera-
tures, even close to door openings.
HEV door curtains are designed for application in shops, fac-
tory halls and warehouses at entry doors, door openings of
loading areas and for doorways between spaces with differ-
ent temperatures to reduce draught at floor level, energy con-
sumption and eliminate humidity transfer. Thanks to a long air
throw, HEV door curtains are also applicable for local heating
of high room spaces.
Door curtains improve the level of comfort, increase the use-
ful area by reducing draught near to door openings and save
heating costs. The best door curtain effect is reached when
ventilation is balanced and the door opening is protected
from wind.

Characteristics

• Warm, effective door curtain
• Low sound level
• Three fan speed alternatives
• Adjustable air flow direction
• Possible to install either visible
or, if required, above the ceiling
• Minimized need of service
• Easy to install and operate

Construction

The frame construction is made of plastic coated, hot dip gal-
vanized steel plate, standard colour white RR20 (RAL 5820).
The heat transfer section is manufactured of copper tubes
and aluminium fins. Water is used as heat transfer medium.
The maximum working pressure of the finned coil is 10 bar.
The scattered fin spacing of the effective finned coil prevents
dust or dirt from gathering on it, and therefore a filter is not
needed. The heat transfer section is equipped with drainage.
HEV

Fans

The fans are centrifugal fans with low sound level.
The 1-phase motors have inbuilt overload protection (auto-
matic reset) and they are pre-wired to the joint junction box.
Protection class is IP23.
The air flow can be regulated by connecting the motor with
the selected fan speed or by using the fan speed regulator.
The maximum fan speed (3) is pre-set at the factory. The fan
Indoor air
speed can also be regulated by external control (see page 3).
Fan speed control is available as an optional extra (incl.
0-position and 3 alternative positions (separate delivery,
dimensions W64xH80xD75 mm).

Selection example

Door opening width is 3 m and maximum required heating
capacity 42 kW. The dimensioning temperature of water is
70/40°C, incoming air temperature is 20°C.
Model HEV-215 is selected, width 1.5 m, so two units are
needed. According to capacity table the capacity of HEV-215
at fan speed 3 is 21 kW, water flow is 0.17 l/s and flow resist-
ance is 4.5 kPa.