Search Results

Engine independent AC-systems, or parking cooling systems for non-idling air conditioning are getting more and more important, because extremely uncomfortable conditions during breaks or a disproportionate amount of fuel consumption for engine idling during breaks are not longer accepted. For cost, weight and package reasons today only thermal storage systems are ready for series production of in series production. The benefits (comfort and fuel savings) and test results of such a system are shown. Future developments of fuel cells or new alternator/battery-systems will probably change this evaluation.

Load maps show the relative frequency of ambient temperatures and driving states divided in several classes. They are a means to determine the yearly average of performance or power consumption of an automotive air-conditioning system. The load maps for California, Central and Southern Europe are used to illustrate the differences in power consumption. The possible power savings using an evaporator control concept are discussed and assessed as an example for an new technique which has low effect at high load but large impact at part load conditions.