HWA1-A & HWA1-H
Chillers and Air/Water heat pumps with axial fans
31
17
ACCESSORIES FOR NOISE LEVEL REDUCTION
17.1
SL
The silenced unit (with SL accessory) is provided with innovating thermo-acoustic shells on compressors. This insulation allows a
noise reduction up to 2dB(A). The special multi-layer structure allwos a thermal insulation which reduces the heat losses up to 6%
at very low outside temperatures.
17.2
SSL
The super silenced unit (with SSL accessory) is provided not only with the thermo-acoustic insulator on compressors but also with
a special diffuser installed on the fan. The diffuser structure improves the air flow efficiency and allows a fan speed reduction,
lowering the acoustic pressure by up to 4,9dB(A) and energy consumption by up to 27% with unchanged airflow. That could lead
to a saving up of a lot of money in energy costs per fan per year. Alternatively, you can get the greater efficiency to boost air
performance by up to 9% at energy consumption parity.
18
OPERATING LIMITS
18.1
EVAPORATOR WATER FLOW RATE
The nominal water flow rate is referred to a ∆T=5°C, between the evaporator’s inlet and outlet temperatures with nominal
capacity at 7°C of the produced water. The allowed maximum flow rate is corresponding to ∆T=4°C. Higher values may produce
too high pressure drops. The allowed minimum water flow rate is corresponding to ∆T=8°C. Insufficient values of water flow may
produce too low evaporating temperatures according to the operating status with the intervention of safety devices which would
stop the unit and, in some particular cases, the water can freeze in the evaporator coil which can breakdown the refrigeration
circuit or causes the increasing of the condensing pressure with the shutdown risk of the appliance and the compressor could be
damaged.
We enclosed below a most accurate table showing the minimum water flow that should be ensured for the plate heat exchanger
in order to have the proper operation of unit as a function of the model (
note:
the water flow switch is used for preventing the
freezing sensor from failure in the case of insufficient water flow but it does not ensure the minimum flow rate required in order
the unit can work properly).
AxiTop Diffuser
Maximum air flow rate at
constant energy consumption
Reduced noise at a
constant air volume
