HB-100/140/160Z1
Temperature Control Unit
Structure and function
O8285-EN 2017-12
29
4.3 Functional principle
The temperature control unit is a self-venting system. It comprises
a pump, a heating element and a cooling element and serves as a
pressure vessel for the heat transfer medium.
A temperature sensor measures the temperature of the heat
transfer medium in the temperature control unit and forwards it in
the form of an electrical signal to the controller input. Optionally, an
external temperature sensor mounted on the consumer can be
connected to the unit.
The heating and cooling elements of the unit are switched on
accordingly by the temperature controller until the heat transfer
medium has reached the required temperature. This temperature is
kept constant. The temperature controlled heat transfer medium is
fed to the consumers by means of a pump.
The heater comprises one or more heated elements.
With the indirect cooling, the cooling process takes place via a heat
exchanger that has cold water flowing through it. The cooling
water is supplied via the cooling water connection.
4.4 Heat transfer medium
Water is used as the heat transfer medium. It is automatically fed
to the temperature control unit via the cooling or system water inlet.
The heat transfer medium water is located in a closed circuit
without oxygen contact in order to prevent oxidation to a large
extent.
Water above 100 °C is under increased pressure (e.g. 4 bar for an
operating temperature of 140 °C), i.e. the boiling point of the water
is raised correspondingly by the static pressure prevailing in the
circuit.
