Air-conditioning installation for motor vehicle, has electronic board that permits calculation of mass flow of refrigerant fluid at level of expansion unit based on area of passage section of expansion unit

摘要

The installation has an electronic board (401) connected with a supercritical refrigerant fluid system (10). The board permits calculation of a mass flow of refrigerant fluid at the level of an expansion unit (12) based on an area of a passage section of the expansion unit, a coefficient of density of a refrigerant fluid, and a pressure of the refrigerant fluid at the inlet of the expansion unit.