Efficient Thermal Management
New two-phase cooling as a building block for compliance with RDE and Euro 7: Classic combustion engines must also make a contribution on the way to climate-neutral transport in 2050. By reducing thermal losses, fuel consumption and exhaust emissions can be further reduced.
Almost six percent less fuel consumption in the WLTC
While the highest possible wall temperature is desired in the partial load range, it should be as low as possible in the full load range to protect the components. This is also made possible by the new two-phase cooling system: “By reducing the pressure, we achieve significantly lower temperatures at full load than conventional cooling systems”, says Arnold. “This also increases the service life of the engine.”
To demonstrate the potential of two-phase cooling, IAV has equipped a conventional turbocharged 1.4-liter gasoline engine with the new technology. Tests show that this reduces fuel consumption in the WLTC by 5.6 percent. The lower coolant mass flow also contributes to this: Depending on the operating point, it is only one to two percent compared with conventional liquid cooling, meaning the coolant pump requires significantly less drive power.
Increased customer interest, new exhaust regulations
“With our comprehensive and long-standing engineering expertise, we are the right partner in the transformation”, says Matthias Krause, Head of the Internal Combustion Engine Design department.
«We not only provide our customers with the best solutions for efficient and flexible thermal management, but also ensure that everything functions optimally in the overall system.”»
— Head of the Internal Combustion Engine Design department
Interest in the two-phase cooling system is currently receiving a boost from the increasing global requirements for exhaust gas emissions and CO2 output. In January 2021, for example, the second stage of the RDE test procedure for measuring real driving emissions will come into force. When the standard was introduced in September 2017, a vehicle was still allowed to emit 2.1 times the legally stipulated limit value. Next January, this conformity factor will drop again to 1.5.
“With the increasing demands on emissions, all reasonable savings potentials must be raised. Two-phase cooling can make a very good contribution in many engines”, says Krause.
