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Konvekta AES-Mode tested in Offenbach

Manufacturers of electric buses and also their component suppliers have been faced with many new challenges. Components such as the heating and air-conditioning system suddenly became just as important as the drive, because electromobility lacks the waste heat needed to keep the vehicle at the right temperature. It is precisely these components of the heating and air-conditioning system, which are responsible for the interior climate and the temperature, that not only determine the climate, but are also essential when it comes to energy saving and range. In various field measurements, many transport companies and bus manufacturers have found that conventional auxiliary heaters put such a strain on the already limited energy supply that the range was reduced by more than 50% at times.

A CO2 heat pump system, on the other hand, draws a large part of the required energy from the ambient air and not from the battery. This system operates more than 50% more efficiently than an all-electric system. The new software add-on module, the AES mode (Additional Energy Storage), makes the additional heater superfluous. Currently, every heat pump vehicle also has an auxiliary electric heater to absorb special temperature peaks in winter and for air conditioning before the start of the journey (preconditioning).

Thanks to the new AES mode module, the CO2 heat pump system 1.7 is able to distribute 100% of the generated energy according to demand. Thus, for example, it can also use 100 % of the available heat for hot water preparation. Another advantage of the system is that it can take over the entire preconditioning process independently, even at low temperatures. Thanks to the good cooperation and the open-mindedness for new developments, the OVB currently has the latest generation of Konvekta CO2 heat pumps with AES mode on test.

Field measurement in Offenbach

The OVB – Offenbacher Verkehrs-Betrieb is currently testing the new AES mode in its e-buses, with the aim of using energy more efficiently, cost-savingly and sustainably.

The electric auxiliary heater worked in the first heating phase with a COP (Coefficient of Performance) of 0.9 – the AES-Mode managed this process with a COP of >1.6. This means that in order to generate 1 kWh of heating energy, the electric auxiliary heater consumed up to 1.23 kWh of electricity, but the CO2 heat pump with AES-Mode only needs 0.63 kWh. In future, the transport company will no longer have to pay for this 0.63 kWh of energy.

© Konvekta
20.07.2022
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