Delphi's system integrates a reservoir of PCM within the air-conditioning evaporator. During normal operation, PCM reservoir is kept cool such that the PCM material is maintained in a frozen state. When the air conditioning system is stopped, the PCM gradually liquefies or melts, drawing heat from the air to keep passengers cool and comfortable. The system can typically maintain target air temperature at the cabin vents for one to two minutes based upon the quantity of PCM in the reservoir. The system keeps the occupants comfortable throughout periods of stop-start driving while conserve fuel.
As per the release, Delphi technologies can reduce HVAC system fuel usage by 50 percent.The technology is now moving from testing to its first vehicle development program and is expected on the road by 2014.
Read the full press release.