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STDITR01ADP2090EV TECNOFRIGO TUSCANY srl
Purging and energy recovery
Bleeding and energy recovery are solutions aimed at energy saving, which recycle heat from the rotor or
by recovering heat of the moist air expelled. This reduces the energy required for the heating coil of the
regeneration air.
The “purge with a low dew point” is used to allow very low dew point. A marginal part of air-stream of
dry air is mixed with the inlet reactivation air, making more efficient drying of the rotor.
Reactivation air pre-heater coil
The pre-heater coil is an additional coil to further reduce energy costs. Generally it is installed on the
input of the reactivation air and consists of a heat exchanger (finned coil) and a control valve with a
proportional actuator. It may use steam or hot water, coming from the centralized system.
During normal operation, this coil works as the main coil, whereas the electric heater coil comes into
operation if the supply of heating becomes insufficient or it’s request more dehumidification capacity.
The control valve of the hot water or stream is factory assembled and supplied already connected to the
unit.
Reactivation air heater coil
Electric
The reactivation electric coil has steel elements, connected in star and divided into 2,3 or more groups
for the regulation in step with sequential insertion to have a modulation of the power. Optionally you
can use a continual modulation with a proportion management of the power to increase the efficiency
of the yield of the dehumidifier and save energy.
Steam
The reactivation steam coil consists of steel tubes aluminum fin ( in option a stainless steel version or
other material can be request), and includes a 2 way valve (supplied optionally) with a modulating
actuator to ensure a greater efficiency of the dehumidifier, acting on the flow rate of the steam.
Hot water
The reactivation coil with hot water consists of copper tubes and aluminum fins (in option stainless steel
or other material can be required), and it includes a 3-way valve (supplied as an option) with modulating
actuator, to ensure greater efficiency of the dehumidifier, acting on the water flow. The coil is approved
to the Pressure Equipment Directive (PED) for use in Europe with air and oxygen. If there is the risk that
the temperature falls causing frosts, you must install and connect a sensor according to the wiring
diagram. The sensor checks to see if the temperature is below the safety threshold, opening completely
the valve to make the hot water circulate inside the exchanger. If the temperature continues to fall, an
alarm will signal and the dehumidifier stops.
If there is the risk that the temperature falls causing frosts, we recommends adding the
antifreeze in the water, to avoid damage to the heat exchanger.
Electrical panel
The electrical panel is located inside the unit. Switches and indicators of operation are located outside
the dehumidifier.
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