Badger (cogeneration unit)

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Dachs is the brand name for small combined heat and power plants from SenerTec Kraft-Wärme-Energiesysteme GmbH in Schweinfurt . With a heating output of around 1  kW to 40 kW and an electrical output of 700 W to 20 kW, the "Dachs" is used in residential buildings ( micro-power-heat coupling ) and commercial properties.

history

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The Dachs was the first micro-cogeneration unit to be mass-produced and was initially called "Sachs Heiz-Kraft-Anlage (HKA)". The origins go back to the oil price shocks in the 1970s. At the automotive supplier Fichtel & Sachs in Schweinfurt , a heat pump was therefore developed from 1979 on , which was driven by a gas engine.

With the drop in the price of oil , the assessment of the market success of this heating concept deteriorated. The engine, which was specially developed for this application, was also suitable for driving a generator in a small combined heat and power unit due to its durability . From 1986, work was therefore carried out on the development of the "roof". The first prototypes were made in 1989. Extensive field tests began in the early 1990s.

With the start of series production, the “Sachs Energietechnik” department was founded in 1996 as “SenerTec Kraft-Wärme-Energiesysteme GmbH”. On the company's ten-year anniversary, the company had grown to around 100 employees and produced almost 3,000 badgers per year. SenerTec has been part of Baxi , a British heating technology manufacturer , since 2002 and is now part of the BDR Thermea group of companies , one of the leading heating device manufacturers in Europe, and now employs around 150 people.

Technical specifications

The "classic" badger works on the principle of combined heat and power . A water-cooled internal combustion engine drives a generator , which is also water-cooled . Further thermal energy is recovered through an exhaust gas and lubricating oil heat exchanger. The resulting heat can be used for heating and domestic water. The electricity generated is used in the home network. Surplus is fed into the public low-voltage network.

In the first generation of the roof , a single-cylinder four-stroke special engine with a displacement of approx. 580 cm³, which was specially developed for operation in heating systems, served as the drive unit. The Dachs is offered as standard for operation with liquid gas or natural gas . The electrical power is between 5.0 and 5.5 kW, depending on the type. The thermal output comes to values ​​between 10.3 kW ( RME ) and 12.5 kW (natural gas). With an additional condensation flue gas heat exchanger , this can be increased to 14.8 kW by using the calorific value .

According to the manufacturer, the electrical efficiency is 26–30%. The thermal efficiency is 59–63% without and 66–74% with utilization of the calorific value. This results in an overall efficiency (fuel utilization) of 88 to 99%.

At the ISH 2013, the company SenerTec presented a combined heat and power plant with around 20 kW electrical output. With this new Dachs, the Dachs Pro G / F 20.0, the overall efficiency is up to 102.4 percent. The system thus achieves energy efficiency class A +++.

In the meantime there are also systems with fuel cell technology in which natural gas is used as fuel. Inside the fuel cell heater, the hydrogen contained in the natural gas reacts with oxygen to form water. With the help of this controlled electrochemical reaction, the so-called cold combustion, the Dachs InnoGen produces heat and electricity at the same time with high efficiency ((250 - 700 W el , 210 - 950 W th ))

The second generation of the roof has been on the market since 2019. Now there are four Badgers, the 0.8 (fuel cell), the 2.9 (throttled single-cylinder), the 5.5 (single-cylinder, Dachs Classic) and the 20.0 (multi-cylinder). The electrical output of the second Dachs generation is between 0.8 and 20.0 kW, depending on the type. The thermal output of the product portfolio comes to values ​​between 1,100 W and 44 kW. According to the manufacturer, the electrical efficiency is between 26.5 and 37%. The thermal efficiency is between 55 and 72%. This results in an overall efficiency of 90.7-102.4%.

Awards

  • 2000: "Bavarian Energy Prize 2000"
  • 2004: Austrian Building Services Award
  • 2005: Cogen Europe Annual Award
  • 2009: CHPA Public Sector Award in Great Britain
  • 2012: German Energy Saving Prize
  • 2016/17: Plus X Award 2016/2017 for the Dachs InnoGen fuel cell heating system
  • 2019: "Iconic Award 2019: Innovative Architecture" in the "Product" category

Individual evidence

  1. ↑ a b Michael Mark: From the heat pump to the modular energy center. In: MicroPower Newsletter. Michael Boll, 2011, accessed June 20, 2020 .
  2. ↑ Wolfgang Suttor, Matthias Johler, Dietmar Weisenberger: The mini block-type thermal power station . 5th edition. CF Müller Verlag, Heidelberg 2009, ISBN 978-3-7880-7835-5 , p. 155 .
  3. ↑ Louis Stahl: SenerTec presents the Dachs Gen2 and a new fuel cell heater [ISH 2019]. In: Trade fair report from ISH 2019. Youtube, October 24, 2019, accessed on June 20, 2020 .
  4. ↑ Bavarian Energy Prize: Bavarian Energy Prize: Bavarian Energy Prize. Retrieved June 25, 2018 .
  5. ↑ Cogen - COGEN Europe - The European Association for the Promotion of Cogeneration. Retrieved June 25, 2018 (UK English).
  6. ↑ About the Plus X Award - innovation prize for technology, sport, lifestyle . In: Plus X Award . ( Online [accessed June 25, 2018]).
  7. ^ Badger 2.9 - Iconic World. Retrieved October 7, 2019 .

Web links