Heating Engineering

Environmentally friendly interior heating and cooling with synthetic capillary tube mats

The aim of this project, run by "Clina Heiz- und Kühlelemente GmbH", is to develop new applications for propylene synthetic capillary tube mats in the area of heating (e.g. floor heating) and cooling (e.g. cooling ceilings). This technology enables greater use to be made of regenerative energy sources for climate control in buildings.


The search for innovative, environmentally friendly interior heating and cooling systems is a task with huge potential for the future. For example, well, river or sea water could be used for cooling, and geothermal energy or heat from seasonal reservoirs could be used for heating. In this context, the ongoing development of polypropylene synthetic capillary tube mats, which can have a flow of warm or cold water passing through them, is a promising solution.

The aim of the project is to develop universal applications for polypropylene synthetic capillary tube mats in the area of heating and cooling of buildings. The studies focus on the development and optimisation of heatable and coolable structures (e.g. in concrete components), heatable and coolable heat transfer surfaces on structures (e.g. suspended ceilings, floors, radiant cooling panels). The new systems developed guarantee a high level of thermal comfort with low use of primary energy and direct use of environmental energy. Once the thermodynamic advantages of the capillary tube mats had been formulated and the products optimised, the partners verified their theoretical results in experimental tests.


  • Compared to conventional tube registers, synthetic capillary tube mats represent a more energy efficient solution because of the tight tube spacing (preferably 10 mm).
  • Ideal or good thermal physiological conditions in a shopping centre and in offices under summer conditions were successfully verified when using capillary tube mats in cooling ceilings. There is also potential for achieving significant energy savings.
  • Floor heating using synthetic capillary tube mats has significantly shorter heating-up times than conventional systems due to the lower inertia. The development potential is particularly high when using the mats in an adhesive layer on a dry screed slab.

More Project Information

Project number: 0327241A/B

Project period: 1999 - 2002

Project region: Germany (Berlin)

Project contact:

Herr Dipl. Ing. Chahed

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Source: German National Library of Science and Technology Hannover (TIB)