|
Fläkt Woods
Fläkt Woods Energy Saving Technology
Twin Wheel System
The Fläkt Woods Twin Wheels and Controls package
is helping specifiers gain significant energy savings from air
handling units providing fresh air to active chilled beams.
In any application with a high density of
occupation within rooms, dew-point temperature control can now be
achieved using the Fläkt Woods Wheels and Controls package to
maintain room conditions. This has the dual effect of reducing the
cooling load on the cooling coil and eliminating the requirement for
reheat on the heater battery during the summer cycle, thus
contributing to significant energy savings.
How it works
This system uses both a hygroscopic thermal wheel
and a non-hygroscopic thermal wheel with a cooling coil in between.
The non-hygroscopic wheel reheats the air from the cooling coil,
eliminating the need for a reheater. At the same time, it cools the
extract air. This cooled extract air goes onto the hygroscopic wheel
and this provides enough cooling recovery to reduce a typical
cooling load by half.
The package does not require a regeneration
heater or adiabatic humidifiers.
Conclusions
Calculations show considerable energy savings
over systems without any form of heat recovery. In practice, with
today’s emphasis on energy recovery, most systems will include some
method of heat recovery. Nevertheless, this system shows a marked
efficiency improvement in the summer cycle and is better in the
winter cycle than most systems with some form of heat recovery.
The Fläkt Woods Wheels and Controls package
should also be considered for applications such as:
Chilled Beam Systems – the system dehumidifies
the fresh air so that there is no risk of ‘rain’ in the zones served
by three chilled beams. The system halves the fresh air cooling load
and eliminates the need for a reheater.
Fan Coil Systems – the dehumidification of the
fresh air to the fan coils will result in reduced moisture drop-out
on the fan coils, reducing energy costs.
Displacement Ventilation Systems – full fresh air
systems without humidifiers reduce the maintenance liability usually
associated with humidifier systems, with energy savings.
(Click on image for larger display)
Operation: The operation of the system is as
follows : (refer to fig. 1)
Summer
E-G Outdoor air is initially cooled by the Fläkt
Woods Wheels and Controls package.
G-H It is further cooled and dehumidified, using the cooling coil,
to the required dew-point temperature.
H-C The supply air is then reheated to the required supply condition
using the Fläkt Woods Wheels and Controls package, which extracts
heat from the return air.
Winter
E-F Outdoor air heated by frost coil to 2ºC (only
if required).
F-G Outdoor air heated and humidified by the Fläkt Woods Wheels and
Controls package.
G-C Supply air further heated by the Fläkt Woods Wheels and Controls
package.
C-J Heated to design condition by the heater battery.
 Request information:
Flakt Woods Air Handling
Equipment Fans AHUs Car Park Ventilation Grilles
Request information:
Flakt Woods Energy Recovery & Car
Park Ventilation Fans AHUs Chilled Beams
|
