Air conditioning system for vehicle

摘要

An air conditioning apparatus for a vehicle that includes a multi-stage compressor, an internal heat exchanger, an external heat exchanger, a heat exchanger switching circuit, a cooling expansion passage and a heating expansion passage. The compressor has at least two cylinder bores, one bore being smaller than the other. Refrigerant is compressed in two stages. Refrigerant is conducted from the large cylinder bore to the small cylinder bore via an intermediate chamber. The heat exchanger switching circuit connects the intake chamber of the compressor to one of the heat exchangers depending on whether heating or cooling is desired.