Disclosed herein is a method for producing heating comprising condensing a vapor working fluid comprising (a) E-CF3CH═CHF and (b) at least one tetrafluoroethane of the formula C2H2F4. Also disclosed herein is a heat pump apparatus containing a working fluid comprising (a) E-CF3CH═CHF and (b) at least one tetrafluoroethane of the formula C2H2F4. Also disclosed herein is a method for raising the maximum feasible condenser operating temperature in a heat pump apparatus suitable for use with HFC-134a, comprising charging the heat pump with a working fluid comprising (a) E-CF3CH═CHF and (b) at least one tetrafluoroethane of the formula C2H2F4. Also disclosed herein is a method for replacing HFC-134a refrigerant in a heat pump designed for HFC-134a comprising providing a replacement working fluid comprising (a) E-CF3CH═CHF and (b) at least one tetrafluoroethane of the formula C2H2F4.

Disclosed herein is a method for producing heating comprising condensing a vapor working fluid comprising (a) E-CF3CH═CHF and (b) at least one tetrafluoroethane of the formula C2H2F4. Also disclosed herein is a heat pump apparatus containing a working fluid comprising (a) E-CF3CH═CHF and (b) at least one tetrafluoroethane of the formula C2H2F4. Also disclosed herein is a method for raising the maximum feasible condenser operating temperature in a heat pump apparatus suitable for use with HFC-134a, comprising charging the heat pump with a working fluid comprising (a) E-CF3CH═CHF and (b) at least one tetrafluoroethane of the formula C2H2F4. Also disclosed herein is a method for replacing HFC-134a refrigerant in a heat pump designed for HFC-134a comprising providing a replacement working fluid comprising (a) E-CF3CH═CHF and (b) at least one tetrafluoroethane of the formula C2H2F4.

In an air-conditioning apparatus including a refrigerant circulating circuit A and a heat medium circulating circuit B that performs passing of heat to and from the refrigerant circulating circuit A, the heat medium circulating circuit is a closed circuit, the maximum pump head Pp of a pump of the heat medium circulating circuit is 150 kPa or more, and a pressure near at least a suction side of the pump is set to a charged pressure that is maintained equal to or higher than the atmospheric pressure during operation of the pump.

The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises a fluoroolefin and at least one other component. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, aerosol propellants, and fire suppression and fire extinguishing agents.

The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises a fluoroolefin and at least one other component. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, aerosol propellants, and fire suppression and fire extinguishing agents.

Systems and methods are provided for detecting low refrigerant charge in a refrigeration system. Specifically, the present invention provides systems and methods for comparing refrigerant charges of the refrigeration system during at least substantial shut down.

In one aspect, a system for recharging a refrigeration system of a vehicle is provided. The system includes a refrigerant delivery device configured to removably couple to a recharge port of the refrigeration system. The refrigerant delivery device comprises a controller, a refrigerant container, and at least one sensor. The controller is configured to communicatively couple with User Equipment (UE) of a user over a communication channel. The refrigerant container stores a refrigerant. The at least one sensor is configured to measure one or more parameters of the refrigeration system. The controller is configured to transmit, via the communication channel, the one or more parameters of the refrigeration system to the UE, receive, via the communication channel, one or more commands from the UE to perform a recharge process for the refrigeration system, and selectively deliver the refrigerant to the refrigeration system in response to the one or more commands.

A system for starting a refrigeration system includes a liquid line regulating valve, a liquid line charging valve, a suction line expansion valve, a suction line charging valve, and a controller. The controller is configured to override normal operation of the refrigeration system and transmit a demand signal to enable partial system operation. The controller is configured to operate the liquid line regulating valve and the liquid line charging valve to charge a receiver tank, gradually increase the demand signal to a predetermined level of partial system operation, and release the liquid line charging valve to normal operation. The controller is configured to operate the suction line expansion valve and the suction line charging valve to charge a suction line, gradually increase the demand signal to full system operation, and release the liquid line regulating valve, the suction line expansion valve, and the suction line charging valve to normal operation.

A system for starting a refrigeration system includes a liquid line regulating valve, a liquid line charging valve, a suction line expansion valve, a suction line charging valve, and a controller. The controller is configured to override normal operation of the refrigeration system and transmit a demand signal to enable partial system operation. The controller is configured to operate the liquid line regulating valve and the liquid line charging valve to charge a receiver tank, gradually increase the demand signal to a predetermined level of partial system operation, and release the liquid line charging valve to normal operation. The controller is configured to operate the suction line expansion valve and the suction line charging valve to charge a suction line, gradually increase the demand signal to full system operation, and release the liquid line regulating valve, the suction line expansion valve, and the suction line charging valve to normal operation.

The disclosure relates to apparatuses and methods for indicating status of multi-phase vacuum-assisted recovery of refrigerant from a vehicle. One apparatus for multi-phase vacuum-assisted recovery of refrigerant from a vehicle includes a compressor that removes refrigerant from the vehicle during a first phase and a second phase of a recovery process. The apparatus also includes a vacuum pump to assist the compressor in the removal of refrigerant from the vehicle during a second stage of the recovery process. Further, the vacuum pump is fluidly connected in series with the compressor during the second phase of the recovery process. The apparatus additionally includes one or more status lights and at least one processor to determine a status of the recovery process. At least one of the status lights is illuminated to represent a status of the recovery process, and at least one is visible from 360 degrees around the apparatus.