A concentric tubing apparatus (68) prevents heat gain in an air conditioning system (12). The heat gain results from heat generated in an engine compartment of a vehicle. To accomplish this, the tubing apparatus includes a first and second refrigerant tube...

A heat exchanger tube (22) especially for the inner heat exchanger (11) of a car's high pressure air-conditioning plant has: - an outer sleeve surface (27) that is concentrically arranged with the central axis; and a concentric central channel (29) flowed ...

An automotive air conditioning system includes a primary, refrigerant loop (10,12,14) and a low pressure secondary loop (22, 24, 26, 28) across which heat is exchanged by a chiller (16). A liquid coolant reservoir (24, 42) in the secondary loop has a provi...

A tube assembly for an auxiliary heating and air conditioning system includes an inner tube (12) extending longitudinally, an outer tube (18) extending longitudinally and disposed over the inner tube, the outer tube including a plurality of ribs (20A) for ...