Abstract: A refrigeration system includes a gas cooler/condenser configured to remove heat from a refrigerant, a temperature sensor configured to measure a temperature of the refrigerant leaving the gas cooler/condenser, a pressure sensor located along the high pressure conduit and configured to measure a pressure of the refrigerant leaving the gas cooler/condenser, a pressure control valve operable to regulate the pressure of the refrigerant leaving the gas cooler/condenser, and a controller. The controller is configured to determine whether the refrigerant leaving the gas cooler/condenser is in a subcritical region based on at least one of the measured temperature of the refrigerant or the measured pressure of the refrigerant.

Abstract: Systems and methods relate to a temperature-controlled case. The temperature-controlled case includes a housing that defines a temperature-controlled space and an opening for providing user access to the temperature-controlled space. The case also includes a cooling element in thermal communication with the temperature-controlled space. The case further includes a modular plenum coupled to the housing and positioned behind the cooling element relative to the opening, wherein the modular plenum includes: at least one fan removably coupled to the modular plenum, wherein the at least one fan induces an air flow through the cooling element, and at least one electrical connector coupled to the modular plenum and positioned proximate each of the at least one fan for providing electrical power to each of the at least one fan.

Abstract: A refrigeration system includes a first compressor system, a second compressor system, a first conduit, a heat exchanger, a second conduit, and a third conduit. The first compressor system includes a plurality of first compressors. The second compressor system includes a plurality of second compressors. The first conduit is configured to provide refrigerant from the first compressor system to the second compressor system. The second conduit is fluidly coupled to the first conduit and configured to provide the refrigerant from the first compressor system to the heat exchanger. The third conduit is configured to provide the refrigerant from the second compressor system to the heat exchanger.

Abstract: A refrigeration system includes an evaporator within which a refrigerant absorbs heat, a gas cooler/condenser within which the refrigerant rejects heat, a compressor operable to circulate the refrigerant between the evaporator and the gas cooler/condenser, a high pressure valve operable to control a pressure of the refrigerant at an outlet of the gas cooler/condenser, and a controller. The controller is configured to automatically generate a setpoint for a measured or calculated variable of the refrigeration system based on a measured temperature of the refrigerant at the outlet of the gas cooler/condenser. The setpoint is generated using a stored relationship between the measured temperature and a maximum estimated coefficient of performance (COP) that can be achieved at the measured temperature. The controller is configured to operate the high pressure valve to drive the measured or calculated variable toward the setpoint.

Abstract: Various embodiments disclosed herein related to a multistage oil separator. The oil separator includes a housing having a nozzle and defining an internal space and an oil outlet; a body disposed within the internal space, the body including a mixed fluid inlet configured to receive a coolant and oil mixture and a nozzle that receives at least a portion of the coolant and oil mixture from the mixed fluid inlet and discharges coolant and oil into the internal space of the housing; and, a wall disposed proximate to the nozzle of the body, wherein at least a portion of the discharged coolant and oil impacts the wall to direct the at least the portion of coolant and oil towards the nozzle of the housing. The oil separator functions to separate the coolant from the oil discharged from a compressor in a cooling system.

Abstract: A support assembly includes a body and a bearing assembly. The body defines a first opening. The bearing assembly is selectively repositionable within the first opening. The bearing assembly includes a housing, a socket, and a ball. The housing defines a second opening. The socket is positioned at least partly within the second opening and coupled to the housing. The ball bearing is positioned within the socket. The ball bearing is configured to rotate with respect to the housing. The bearing assembly is selectively repositionable between a first position, where the ball bearing extends from the body, and a second position, where the ball bearing does not extend from the body.

Abstract: A refrigeration system includes a receiver, a gas bypass valve, a parallel compressor, and a controller. The gas bypass valve and the parallel compressor are fluidly coupled to an outlet of the receiver in parallel and configured to control a pressure of a gas refrigerant in the receiver. The controller is configured to switch from operating the gas bypass valve to operating the parallel compressor to control the pressure of the gas refrigerant in the receiver in response to a value of a process variable crossing a switchover setpoint. The value of the process variable depends on an amount of the gas refrigerant produced by the refrigeration system. The controller is configured to automatically adjust the switchover setpoint in response to the amount of the gas refrigerant produced by the refrigeration system being insufficient to sustain operation of the parallel compressor.

Abstract: A refrigeration system includes a refrigeration circuit and a coolant circuit separate from the refrigeration circuit. The refrigerant circuit includes a gas cooler/condenser, a receiver, and an evaporator. The coolant circuit includes a heat exchanger configured to transfer heat from a refrigerant circulating within the refrigeration circuit into a coolant circulating within the coolant circuit, a heat sink configured to remove heat from the coolant circulating within the coolant circuit, and a magnetocaloric conditioning unit configured to transfer heat from the coolant within a first fluid conduit of the coolant circuit into the coolant within a second fluid conduit of the coolant circuit. The first fluid conduit connects an outlet of the heat exchanger to an inlet of the heat sink, whereas the second fluid conduit connects an outlet of the heat sink to an inlet of the heat exchanger.

Abstract: A CO2 refrigeration system includes a plurality of compressors configured to circulate a CO2 refrigerant, a suction line configured to deliver the CO2 refrigerant to the compressors, an oil separator configured to separate oil from the CO2 refrigerant, and an oil return line configured to deliver the oil from the oil separator to the suction line. The oil mixes with the CO2 refrigerant in the suction line before reaching the compressors.

Abstract: A fuel dispensing system includes a plurality of fuel dispensers, at least one tank configured to store fuel, at least one pump configured to pump the fuel from the tank to at least one of the fuel dispensers, and a fuel panel assembly configured to supply electric power to each of the fuel dispensers. The fuel panel assembly includes a plurality of overcurrent protection breakers, each overcurrent protection breaker provided for one of the fuel dispensers. The fuel panel assembly further includes a plurality of disconnect devices, each disconnect device provided for one of the fuel dispensers. The fuel panel assembly is provided within a single control panel enclosure.

Abstract: A support assembly includes a body, a first bearing assembly, a first fastener, and a leg. The body includes a first aperture centered on an axis. The first bearing assembly includes a first ball bearing. The first fastener is threadably engaged with the first aperture. The leg is selectively repositionable along the axis. The leg includes a support. The first fastener is configured to cooperate with the leg to cause repositioning of the support relative to the body in response to rotation of the first fastener within the first aperture.

Abstract: A support assembly includes a body and a bearing assembly. The body defines a first opening. The bearing assembly is selectively repositionable within the first opening. The bearing assembly includes a housing, a socket, and a ball. The housing defines a second opening. The socket is positioned at least partly within the second opening and coupled to the housing. The ball bearing is positioned within the socket. The ball bearing is configured to rotate with respect to the housing. The bearing assembly is selectively repositionable between a first position, where the ball bearing extends from the body, and a second position, where the ball bearing does not extend from the body.

Abstract: A refrigeration system for a temperature-controlled storage device includes a refrigeration circuit, a cooling circuit, and a controller. The refrigeration circuit includes a compressor driven by a brushless DC motor operable at multiple different speeds, a first heat exchanger, an expansion device, and a cooling unit in fluid communication via a first working fluid. The cooling circuit includes a pump and a second heat exchanger in fluid communication with the first heat exchanger via a second working fluid such that the first heat exchanger is liquid-cooled by the second working fluid. The controller operates the brushless DC motor at multiple different speeds to accommodate multiple different thermal loads experienced by the refrigeration system. Each of the speeds corresponds to a different thermal load. The controller modulates the speed of the brushless DC motor to maintain a desired temperature of a temperature-controlled space within the temperature-controlled device.

Abstract: 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.

Abstract: A temperature controlled case includes a housing that defines a temperature controlled space and a multi-circuit cooling element in thermal communication with the temperature controlled space. The multi-circuit cooling element includes two or more cooling coils. Each of the cooling coils is coupled to a different circuit structured to selectively circulate coolant through the multi-circuit cooling element. Each circuit is fluidly separate from each remaining circuit such that the coolant circulated through each circuit is not shared with each remaining circuit. The multi-circuit cooling element further includes a plurality of heat exchange fins coupled to each of the two or more cooling coils such that each of the heat exchange fins facilitates heat removal from the temperature controlled space by each of the two or more cooling coils.

Abstract: A heat exchanger for a temperature controlled case is disclosed herein. A temperature controlled case includes a housing that defines a temperature controlled space. The housing includes a duct that receives circulated air. A heat exchanger is coupled to the housing and disposed within the duct. The heat exchanger includes an intake face at a non-perpendicular angle relative to an air flow direction in the duct immediately upstream of the heat exchanger.

Abstract: An anti-condensing system includes a control panel configured to electrically couple between a power source and a temperature regulating display unit. The control panel includes a housing defining an interior cavity, a door selectively repositionable to facilitate accessing the interior cavity of the housing, and a circuitry assembly disposed within the interior cavity. The circuitry assembly includes a relay configured to couple to a heating element of the temperature regulating display unit, an overcurrent protection breaker coupled to the relay and directly integrated into the control panel such that the overcurrent protection device can be locked out at the control panel, and a control circuit coupled to the relay. The control circuit is configured to actively control the relay to prevent condensation from forming on the temperature regulating display unit.

Abstract: 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.

Abstract: Various embodiments disclosed herein related to a multistage oil separator. The oil separator includes a housing having a nozzle and defining an internal space and an oil outlet; a body disposed within the internal space, the body including a mixed fluid inlet configured to receive a coolant and oil mixture and a nozzle that receives at least a portion of the coolant and oil mixture from the mixed fluid inlet and discharges coolant and oil into the internal space of the housing; and, a wall disposed proximate to the nozzle of the body, wherein at least a portion of the discharged coolant and oil impacts the wall to direct the at least the portion of coolant and oil towards the nozzle of the housing. The oil separator functions to separate the coolant from the oil discharged from a compressor in a cooling system.

Abstract: A refrigeration system includes a subcooler configured to provide subcooling for a liquid refrigerant flowing through a first side of the subcooler by transferring heat from the liquid refrigerant to a gas refrigerant flowing through a second side of the subcooler. An expansion valve is located at an inlet of the second side of the subcooler and configured to control a flow of the gas refrigerant through the second side of the subcooler. A gas temperature sensor and a gas pressure sensor are configured to measure a temperature and pressure of the gas refrigerant. A liquid temperature sensor is configured to measure a temperature of the subcooled liquid refrigerant. A controller is configured to calculate a superheat of the gas refrigerant based on the measured temperature and measured pressure of the gas refrigerant and may compare the calculated superheat to a superheat threshold. If the calculated superheat is less than the superheat threshold, the controller may close the expansion valve.