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Haydau - biogas to warm and cool the hotel

Morschen, Niemcy
Innovative heating technology combines medieval and modern
Haydau - biogas to warm and cool the hotel
Haydau - biogas to warm and cool the hotel
Haydau - biogas to warm and cool the hotel
Haydau - biogas to warm and cool the hotel
Haydau - biogas to warm and cool the hotel
Haydau - biogas to warm and cool the hotel

The Hessian heritage convent Haydau has been converted into an international conference complex with modern hotel facilities. The power source is almost completely undertaken by the biogas plant situated nearby, which delivers not only electricity and heating, but also provides cooling water for the hotel's air conditioning. The heating and cooling water is transported by a roughly two kilometer long Flexalen pre-insulated pipe system.

The 13th century monastery Haydau is the best preserved Cistercian monastery in Hessen. The numerous extensions are evidence of its changing history: after the end of its monastic use in 1527, it was initially a fortification of the local count and was later converted to a hunting and summer residence for the Count of Hessen. It served as the Hessian State Domain, then as a dairy, prison and refugee camps. Despite numerous transformations through the different eras, the monastery retained its original character. It combines medieval charm with modern comforts. The first extensive renovation work from 1985 to 2001 saved the historic structures and opened the monastery to the  broader public. The construction over the last three years transformed the medieval monastery into a modern cultural and communication center with 136 hotel rooms, 27 meeting rooms, several apartments and a spacious spa area.


The energy for heating and cooling of the monastery complex is provided by a new, highly efficient biogas plant, which is located approximately two miles from the convention center. It does not only provide the basic heat supply for the buildings, but it also produces electricity, which is fed into the regional electricity grid. Our innovative, installation-friendly Flexalen system proved ideal for the job. The Polybutene medium pipes and connectors form a high-performance system that is pressure-and temperature-resistant up to 95° C and 8 bar.


Supply the historical building with an efficient heating and cooling solution, while preserving the historic spatial effect as well as possible. For an efficient energy transport, the pipes had to be well insulated to minimize energy loss, and protected against corrosion. To keep the construction and operating costs to a minimum, only system-tested pipelines were to be chosen. The pipes should be easy to install, require no maintenance and function safely for decades to come. 


Because of the conservation provisions, the reconstruction works were very demanding. In order to preserve the historic spatial effect as far as possible, the historic building was supplied with a modern temperature control unit during the rehabilitation work. The virtually invisible installed system provides radiant heat through the building envelope, which makes a particularly constant room temperature control possible. At the same time the building structure is permanently protected from moisture. The grounds of the monastery's newly-built hotel complex was equipped with a modern heating system and air conditioning.

As the Flexalen pipes are very flexible, the laying of a coil in practice turned out to be very installation-friendly. The installation of all refrigeration and heating lines could be done quickly and easily with just a few pipe joints. The connections were made by homogeneous welds on a tailor-welded fitting system. For the energy supply of the conference hotel and monastery, approximately 2.100 meters of our hassle-free and maintenance-free Flexalen system could be installed in no time.  

  • 2100 
  • meters of Flexalen
  • 136 
  • hotel rooms and apartments
  • 27 
  • meeting rooms
  • 260 KW
  • to meet the needs
Czas trwania
Michael Biewald
Technical advisor
Oddział: Thermaflex Germany
In der Haydau , 34326 Morschen, Niemcy
C7ca50b2 9f71 4823 b55c dcad69beacdb

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