Heat transfer system
A heat transfer system is a device for controlling the temperature of processing equipment during the production process .
technology
In order to heat or cool objects and materials during their production process, in the past 25 years, in addition to direct temperature control, indirect temperature control of the machines has become established. This is done using heat transfer systems. While conventional direct temperature control uses electrical heating elements or flame exhaust gases and a second media circuit has to be installed for cooling, heat transfer systems only need a single intermediate circuit to connect the heater and heat consumer, so that the heat transfer medium ( thermal oil or water) between the two can circulate. Due to the heat transfer medium, which is generally also referred to as heat transfer oil, thermal oil or thermal oil, heat transfer systems are often also referred to as thermal oil systems , thermal oil systems or hot oil systems. In the Asian region, these systems are often also run as Dowtherm heaters or HTF boilers .
Advantages of the heat transfer system
- Local overheating due to uncontrolled temperature peaks is excluded.
- A very precise, reproducible temperature control on the consumer can be achieved.
- Only a single heat transfer circuit is required, as heat transfer oils can be used in the temperature range from -40 to 400 ° C. Systems with water (hot water) are used in the range of 5 to 200 ° C. Complicated switching and media mixing when changing from a heating cycle to a cooling cycle are thus excluded. At the same time, the process can be automated and managed via a central process control system.
- The heater can be set up centrally (e.g. in a non-hazardous location) and the heat is fed to individual consumers via a branched pipe network.
- Compared to steam heating, the heat transfer takes place almost without pressure, as many heat transfer oils remain in the liquid phase up to a temperature of 350 ° C below ambient pressure.
- Heat transfer systems can be operated without constant supervision.
- Higher efficiency than direct heating
- Heat transfer oil is non-corrosive and therefore enables the use of conventional carbon steels for pipelines and tanks with extremely long service lives. It should be noted, however, that the heat transfer properties of heat transfer oils are only about half as good as those of water.
literature
- Walter Wagner: Heat transfer technology with organic fluids . Vogel Communications Group, Würzburg 2005, ISBN 978-3-8343-3204-2