Airheater-Heating with Thermal oil:
Injection- or quantity regulation

When the three-way valve is closed (A-AB) the secondary pump delivers the thermooil through the secondary flow pipe, through the air-heat exchanger, the secondary return pipe and through the secondary bypass. When the three-way valve opens a little bit (A-AB), some thermooil will inject from the primary main flow pipe to the secondary flow pipe. Simultaneously, the same quantity of thermooil leaves the secondary circuit over the three-way valve back to the primary main return circuit. The secondary circuit is always self-contained and so we do have two circuits with two different quantities of thermooil and now we are able to work with two different temperatures. For example we do have 230°C/ 200°C (DT 30) in the primary main circuit and 180°C/ 170°C (DT 10) in the secondary circuit.

The controller controls the three-way regulation valve (mounted in the main return pipe), dependent on the measured air temperature. According to the necessary requirement of energy the thermooil goes through the air-heat exchanger, through the three-way regulation valve (A-AB) and back to the main return pipe. The quantity of oil which is not used in the air-heat exchanger goes through the bypass and through the three-way regulation valve (B-AB) also back to the main return pipe. The inlet temperature at the air-heat exchanger is always the highest temperature from the main flow pipe. The temperature difference (D T) over the air-heat exchanger can be very big (less thermooil).

• The oil quantity will be adjusted continuously to the necessary air temperature.
• There are some big temperature differences in the air-heat exchanger which could create tensions and leakages.

• More and bigger primary pipelines
• More and bigger insulation
• More mountings

• The quantity regulation is a variable less exactly temperature regulation.
• The thermooil plant, build by the customer, will be more expensive because there are some extra costs for the pipelines and the insulation.
  

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Manufacturer of airheater with experience for years.

Mail: Regiomat AG - info@regiomat.com Erlenstrasse 50; CH-4106 Therwil / Switzerland Tel:   ++41-61-721'12'60 Fax:  ++41-61-722'12'66

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