The Dachs unit
The Dachs unit works on the principle of combined heat and power generation. An internal combustion engine drives a generator which, in turn, produces electrical energy. Around 90% of the heat that is produced by the engine and generator during this process is recovered and is fed directly into the building’s centralised heating and hot water system. The electrical output of the Dachs unit ranges between 5.0 and 5.5 kW, with a heat output of 12.3 to 12.5 kW. The Dachs unit works in parallel with the mains electicity supply. Heat and power are produced at the same time.
If serviced in accordance with the service schedule and maintenance instructions, the single-cylinder 4-stroke 580 cc special engine is designed for a very long service.
The specially-developed watercooled asynchronous generator is firmly bolted to the engine, which drives the generator via a singlestage gear. The nominal active power of 5.5 kW is achieved with up to 91% efficiency and a cos greater than 0.95.
The unit is housed in a sound-proofed and thermally insulated enclosure. The sound pressure level at a distance of 1 m is approx. 56 dB(A) in accordance with DIN 45635. To avoid structure-borne noise, all services are connected with flexible connections.
The controller (MSR2)
The unit is controlled according to the heat demand. The integral microprocessor controller maintains a constant electrical output. The MSR2, which can be monitored and operated on site by a laptop or remotely by an internet connection, regulates the Dachs unit, the heat generation and the heating, gas and electricity supply systems. The power supply system is monitored by the integrated grid protection. With the additional SE ancillary board the controller takes care of controlling domestic hot water demands and heating circuits as well. The software can be updated via an infrared interface.
Up to 10 modules may be networked and operated with the standard controller.
Servicing must to be carried out by an authorised SenerTec partner according to the maintenance schedule.
The flue gases are routed unpressurised into the boiler flue or into the chimney. The flue gas temperature is approx. 160°C. The flue gas temperature can be further reduced with the addition of a condensing exhaust heat exchanger (condensing unit). Fuel efficiency can be boosted to over 100% (in relation to LHV for the fuel used).
Monitoring and controlling the MSR2 can be carried out via on-site laptop or a internet connection. The integrated modem connects the controller to the SenerTec server.
The engine concept for the Dachs G/F unit (lean-burn engine) allows low NOx values. An integral catalyser converts CO and HC. Producing power and heat at the same time utilises almost 100% of the primary energy. Considerable amounts of primary energy can be saved and CO2 emissions avoided compared to conventional, separate power and heat generation.
Natural gas, LPG
5.0 – 5.5 kW electrical,
12.3 – 12.5 kW thermal.
12.3 – 12.5 kW thermal.
Up to 20 years, depending on the annual operating hours and providing the unit is serviced according to servicing schedule and maintenance instructions.
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