Vehicle Heating and/or Air Conditioning Method

Abstract

A method for the heating and/or air conditioning of the passenger compartment of an automobile using a reversible cooling loop in which flows a coolant containing 2,3,3,3-tetrafluoropropene. The method is particularly useful when outdoor temperature is lower than −15° C. The method can be used for hybrid automobiles designed for operating alternatively with a thermal engine and an electric motor.

1 - 8 . (canceled) 
     
     
         9 . A method for heating a passenger compartment of an automobile, the method comprising:
 heating outside air from a temperature of -15° C. or less in a reversible cooling loop by flowing a coolant, the reversible cooling loop comprising a first heat exchanger, an expansion valve, a second heat exchanger, a compressor and means for reversing the direction of flow of the coolant,   wherein the automobile comprises a thermal engine and/or an electrical battery,   wherein the coolant comprises 2,3,3,3-tetrafluoropropene.   
     
     
         10 . The method as claimed in  claim 9 , wherein the coolant comprises 80% to 98% by weight of 2,3,3,3-tetrafluoropropene. 
     
     
         11 . The method as claimed in  claim 9 , wherein the coolant comprises 90% to 98% by weight of 2,3,3,3-tetrafluoropropene. 
     
     
         12 . The method as claimed in  claim 9 , wherein the coolant comprises 95% to 98% by weight of 2,3,3,3-tetrafluoropropene. 
     
     
         13 . The method as claimed in  claim 9 , wherein the coolant consists essentially of 2,3,3,3-tetrafluoropropene.