초록 ▼

A method and apparatus for determining refrigerant density and mass flow rate, and for pressurizing a refrigerant recovery tank while the refrigeration system is being recharged. The mass of a flowing refrigerant is automatically continually determined by reliable static means in a controlled rechar

A method and apparatus for determining refrigerant density and mass flow rate, and for pressurizing a refrigerant recovery tank while the refrigeration system is being recharged. The mass of a flowing refrigerant is automatically continually determined by reliable static means in a controlled recharging process. Flow-dependent pressure, such as the pressure drop across the orifice, and temperature data are taken from the recharging system and are connected to a data processor which uses the pressure and temperature data to determine the refrigerant density and the mass of the flowing refrigerant that has been used. The pressure of a source of recharging refrigerant can be maintained by withdrawing and heating liquid refrigerant and returning the resulting superheated vapor directly to the source of recharging refrigerant, and recharging operations can proceed during such pressure maintenance.

대표청구항 ▼

[ I claim:] [20.] A method of recharging an automotive refrigeration system, the method comprising the steps of:providing a source of refrigerant;transferring refrigerant between said source of refrigerant and said automotive refrigeration system.directing the transferred refrigerant from the source

[ I claim:] [20.] A method of recharging an automotive refrigeration system, the method comprising the steps of:providing a source of refrigerant;transferring refrigerant between said source of refrigerant and said automotive refrigeration system.directing the transferred refrigerant from the source of refrigerant through a conduit means to the automotive refrigeration system to be recharged;determining the temperature of refrigerant in the conduit means;determining a flow dependent pressure in said conduit means;determining the mass of refrigerant that is flowing through said conduit means with said determined temperature and pressure; andcontrolling the transfer of refrigerant in response to the determined mass of refrigerant.