Steam or Thermal oil?

Today it is possible to heat the machines with Thermal oil heating system directly or indirectly.
For an example please see also the following technical information “Laundry Installation Technique”

The following disadvantages must be taken into account and are invitable when using high pressure steam:


Regiomat thermal oil heating plant for Laundries

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Behaviour of pressure:

  • Blue: with saturated steam
  • Red: with Thermal oil pressurless !!!

lf, as in the present case, steam is only used as heat carrier, condensates are produced at high temperatures. Pressure removal from this condensate creates big water and energy losses and simultaneously brings along troubles and installation problems. For smooth operation, a continuous maintenance of the water economy is necessary.

Careful attention is to be paid to the selection of the proper type of heating for hot-air dryers in the printing industry. In this regard, specific knowledge concerning the two heating media, steam and thermal oil, and the function of the machines to be heated is of vital importance. “Our objective is to warrant an optimum operating convenience, controi accuracy and operational safety with lowest possible energy consumption”.

An example of basic significance is the selection of the appropriate heating medium. Until now, for large laundries, the high - pressure steam plant was unchallenged and adequately popular everywhere. A satisfactory heat transmission and application on all laundry machineries were the positive features of this traditional old technique. The disadvantages listed below must be accepted and are considered to be almost inevitable.

Shattering power of the high steam pressure, acceptance and Installation obligations, Inspection obligations, water processing, chemical consumption, dally maintenance works, condensate losses, energy losses, corrosions. More armatures and devices are required compared to a thermo oil plant and altogether higher investment costs between 30 to 40 %.

In case of a conservative approach, it would have to continue for ever. Nothing could be more wrong as the most essential advantages of thermal oil plants in laundries were detected and efforts made to develop appropriate installation materials and devices.

Previously, high-pressure steam plants were uncontested and adequately known everywhere. Good heat transfer is a positive characteristic of this heating technology.

When a tumbler is directly connected to the thermal oil system air must be heated to a very high temperature at this end. This heating system is more suitable for this purpose at 220 – 240 °C, - as a reasonable heat recovery can be simply achieved. In case of heating by steam, 100% condensate would return to the boiler room at high temperatures.


Thermal oil heating

The operational safety (also for unskilled personal) and a longer life time are the advantages of a modern, "no-pressure ", thermal oil heating!

Due to the manifold use in the most different industrial branches it can be ascertained today that a well-planned and properly installed thermal oil plant offers specific advantages for the user.

The heat consumers are directly connected to the thermal oil heating system which is suitable for freely adjustable temperatures of up to 350°C. Important units are equipped with secondary circuits, consisting of injection valve and secondary pump etc., so that the operating temperature can be optimally regulated. A centralised thermal oil heating system with closed circuit operates fully automatic, safely without supervision and can be used for general purposes.

In close co-operation with machine manufacturers, Regiomat is involved in the planning and construction of entire installations, including delivery, assembly and commissioning as well as care-taking of such thermal oil heating systems.


Essential advantages of thermal oil compared to with steam:


Explanation of a thermal oil heating system Regiomat

In Regiomat high-temperature units using commercial thermal oils, a controlled circulation via the heater is guaranteed by means of the circulation pump. The thermal oil can freely expand between the heater and the expansion vessel via the expansion line which cannot be shut off. The nitrogen superposition in the expansion vessei warrants the required pressure equalization and seals against oxygen entrance. Thus, the thermal oil does not oxidize even at high temperatures and can therefore be used for more than 12 years!

A centralized thermal oil plant Is fully automatic, reliable and universally applicable and is In operation over decades In various branches of lines of Industry.


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1.   Heater
2.   Burner
3.   Circulation pump
4.   Expansion vessel
5.   Nitrogen system
6.   Gas collection bottle
7.   Autom. centralized air
8.   Cock with cap
9.   Shut-off valves
10. Strainer
11. Vibration absorber
12. Manometer
13. Nitrogen
14. Safety valve
15. Vacuum breaker
16. Manometer
17. Pressostat
18. Thermostat flue gas
19. Flow control
20. Thermostat main pipe
21. Temperature controller
22. Thermostat
23. Temperature gauge
24. Level switch
25. Rupture disk
26. Level control
27. Filling pump
28. Safety valve

Download this diagram here


The machine outfit is specified by the performance and quality requirements. Now, the questions concerning the installation should be clarified with the machine supplier so that the functional efficiency is warranted. At this stage, Regiomat brings in its experience regarding the layout. In this connection, the installation technique is taken seriously into consideration.

The coordination of the ventilation, air-conditioning, electrical, sanitary and heating equipment is the crucial point of our efforts. Specific knowledge regarding laundries is of vital significance for the appropriate selection and dimensioning in order to ensure an optimum and easy operation at the lowest energy consumption.

The questions relating to a reasonable heat recovery from waste air, sewage and waste gases etc. are of immediate importance. The most significant thing is, however, to use energy - saving equipment at the early stage of heat recovery.


Further Information

Grand Hotel Tschuggen, Arosa:
Reconstruction of a laundry from steam to thermaloil

tschuggen_thumb.jpg (13541 Byte)


Mail: Regiomat AG -
Gewerbestrasse 6, CH-4105 Biel-Benken / Switzerland
Tel:   ++41-61-721'12'60
Fax:  ++41-61-722'12'66

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