1/3 of conventional service costs for Konvekta CO2 MAC buses

By Simon Burkel, May 30, 2013, 11:44 2 minute reading

The German NIAG Group (Niederrheinische Verkehrsbetriebe Aktiengesellschaft) has equipped three new buses with Konvekta’s mobile air conditioning units that use CO2 as a refrigerant. The new systems help to save two thirds of the service costs for systems using conventional refrigerants. Konvekta’s R744 MAC systems considerably decrease fuel and energy consumption in buses and trains, and increase the operating range of electric buses. 

According to NIAG, the inspections for vehicles with air conditioning units that use CO2 as a refrigerant are much simpler and only require around a third of the service costs required for a standard R134a system. In addition the new CO2 based systems have functioned without fault and no repairs have been necessary. Further reasons for the savings are the favorable price for CO2 as a refrigerant, as well as the absence of a dryer and complex recovery and recycling cost of the plant.

Operating range of electric buses increased by 40% 
To increase the operating range of electric buses, Konvekta has developed a CO2 climate technology using a heat pump, which reduces the energy demand considerably. In addition the new system extends the lifetime of the sensitive and expensive batteries in electric buses as the combined air conditioning and heat pump unit takes over the temperature control of the batteries, enabling them to always work in an optimal temperature range in terms of power output. This extends the economic lifetime of the batteries and increases the operating distance by up to 40%. Konvekta’s CO2 air conditioning technology provided enables manufacturers of e-buses to offer a truly environmentally friendly vehicle for commercial transportation.
The advantages of the CO2 heat pump for buses:
  • Two-thirds of the required heating energy is taken from the ambient air and no additional energy from the battery is needed.
  • Faster conversion from energy to heat in comparison to a water circuit
  • Higher operating time as well as higher operating range due to conditioning of the battery.
  • CO2 heat pump can supply additional heat exchangers for heating and cooling 
Konvekta CO2 air conditioning for trains reduces energy consumption by 10%
In cooperation with the Deutsche Bahn, Konvekta ran a prototype train using hybrid drive and CO2 air conditioning. Konvekta developed and tested an environmentally friendly CO2 air conditioning system that can reduce energy use for air conditioning by up to 10%. In addition the new hybrid system of Westfrankenbahn achieves up to 25% less fuel consumption and allows emission-free driving in stations. The new technology responds to the stricter eligibility criteria in relation to the engine operation in sensitive areas, which require new technical solutions.


By Simon Burkel

May 30, 2013, 11:44

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