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 one or more compressors (14,24), a gas cooler (105), a flash tank (106), one or more evaporators (12,22), a heat reclaim system (110), valves (120,122,124,126), and a control system (105). The heat reclaim system receives a working fluid from the one or more compressors and the gas cooler. The heat reclaim system is fluidly coupled, through a first supply line (111), to the one or mor compressors, and fluidly coupled, through a second supply line (113), to the gas cooler. The valves regulate a flow of the working fluid from the one or more compressors and the gas cooler to the heat reclaim system. The control system receiving at least one feedback signal from the heat reclaim system and, in response to the at least one feedback signal, operates the valves to regulate an amount of the working fluid circulated into the heat reclaim system from the one or more compressors and the gas cooler.

Abstract: A refrigeration system having a primary receiver, a secondary receiver, a first gas bypass valve, and second gas bypass valve, a feed control valve, and a controller. The primary receiver has a primary receiver operating pressure and is configured to collect a refrigerant circulated by the refrigeration system. The secondary receiver includes a liquid refrigerant inlet fluidly coupled to a primary receiver liquid refrigerant outlet. The feed control valve is coupled between the primary receiver liquid outlet and the secondary receiver liquid refrigerant inlet. The controller operates the feed control valve to control a flow of a liquid refrigerant from the primary receiver to the secondary receiver.

Abstract: A refrigerated display case door glass panel assembly includes a first pane of glass and a second pane of glass bounding a sealed space between the panes, and an electrically conductive coating applied to a surface of the first pane. The coating extending across at least a majority of a viewing area of the first pane. A first pair of electrical buses spaced apart from one another and electrically connected to the coating at respective first and second ends of the first pane, the first and second ends being opposite one another, and a second pair of electrical buses spaced apart from one another and electrically connected to the coating at respective third and fourth ends of the first pane. The third and fourth ends being opposite one another and adjacent to the first and second ends.

Abstract: A refrigeration system includes a refrigeration subsystem and a coolant subsystem. The refrigeration subsystem is configured to circulate a refrigerant between an evaporator (12,22) within which a refrigerant absorbs heat and a gas cooler/condenser (2) within which the refrigerant rejects heat to provide cooling to a temperature-controlled space. The coolant subsystem includes a heat exchanger (61) coupled to the refrigeration subsystem at an outlet of the gas cooler/condenser and configured to transfer heat from the refrigerant exiting the gas cooler/condenser to an external coolant when the external coolant flows through the heat exchanger, a control valve (64), and a controller (50) configured to operate the control valve to control a flow of at least one of the refrigerant or the external coolant through the heat exchanger based on a temperature of the external coolant relative to a temperature of the refrigerant exiting the gas cooler/condenser.

Abstract: Systems and methods for deploying a defrost heater include a rod heater bracket that includes a body including a first edge and a second edge opposite the first edge. The bracket includes at least one L-shaped slot formed in the body. The L-shaped slot includes an opening along the first edge, and a groove located adjacent to the second edge and configured to retain at least a portion of a rod heater adjacent an evaporator of a refrigerated display case. The rod heater bracket includes a tab configured to be adjusted between an open position to allow access to the groove through the second edge and a closed position to block access to the opening between the second edge and the groove.

Abstract: A refrigerated display case chassis includes a first insulated panel and a second insulated panel. The first insulated panel has a first foam layer bounded by a first pair of thermally conductive sheets. The first insulated panel forms a first wall of the refrigerated display case chassis. The second insulated panel has a second foam layer bounded by a second pair of thermally conductive sheets. The second insulated panel forms a second wall of the refrigerated display case chassis. The second insulated panel mates with the first insulated panel to form a thermally insulated joint where, in cross-section, one sheet of the first pair of thermally conductive sheets terminates at a surface of the second foam layer. The thermally conductive sheets have a greater thermal conductivity than the first or second foam layers.

Abstract: A thermoelectric cooling system includes a first circuit, a second circuit, a circuit heat exchanger, and a thermoelectric subsystem. The first circuit is configured to circulate a first refrigerant. The second circuit is configured to circulate a second refrigerant. The circuit heat exchanger includes a circuit heat exchanger first passage and a circuit heat exchanger second passage. The circuit heat exchanger first passage is coupled to the first circuit and configured to receive the first refrigerant from the first circuit and provide the first refrigerant to the first circuit. The circuit heat exchanger second passage is coupled to the second circuit and configured to receive the second refrigerant from the second circuit and provide the second refrigerant to the second circuit. The thermoelectric subsystem includes a thermoelectric subsystem first heat exchanger and a first thermoelectric cell. The thermoelectric subsystem first heat exchanger has a thermoelectric subsystem first heat exchanger passage.

Abstract: Systems and method for operating a refrigeration system include a heat exchanger configured to remove heat from a refrigerant and discharge the refrigerant into a conduit. A temperature sensor, a pressure sensor, and a pressure control valve are located along the conduit. A controller is configured to determine that the refrigerant leaving the heat exchanger is outside of a subcritical region based on the measured temperature or measured pressure of the refrigerant. A target temperature is determined based at least in part on a pseudo-subcooling temperature value and the measured temperature of the refrigerant. A supercritical pseudo-saturated pressure is determined based on the target temperature. A pressure offset is determined based on the target temperature, a maximum operating pressure of the refrigeration system, and an offset factor. The pressure control valve is operated to drive the pressure to a target pressure based on the pressure offset and the pseudo-saturated pressure.

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 refrigeration assembly includes a receiver tank, a heat exchanger, a first piping assembly, and a second piping assembly. The receiver tank has a fluid outlet and a fluid inlet that receives a working fluid. The heat exchanger is disposed within the receiver tank. The heat exchanger has coiled tubing that is fluidly coupled to the fluid inlet and to the fluid outlet. The first piping assembly is disposed between and is fluidly coupled to the fluid inlet and the coiled tubing. The first piping assembly has a first double riser and a first P-trap. The second piping assembly is disposed between and is fluidly coupled to the fluid outlet and the coiled tubing. The second piping assembly includes a second double riser and a second P-trap.

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: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for determining if a product in a refrigerated display case has likely spoiled. The method can include: obtaining, from one or more thermal cameras installed in a refrigerated case, multiple images of the inside of the refrigerated case; determining, based on the multiple images, a surface temperature of one or more products contained in the refrigerated case; determining that the surface temperature of at least one product violated a spoilage temperature for a period of time; and in response to determining that the surface temperature of at least one product violated a spoilage temperature for a period of time, providing, for display on a user computing system, a graphical interface indicating that the product is likely spoiled.

Abstract: A refrigeration system includes an evaporator configured to receive a flow of refrigerant and transfer heat into the refrigerant within the evaporator to provide cooling for a temperature-controlled space, an expansion valve operable to modulate the flow of refrigerant into the evaporator, a liquid level sensor configured to measure a level of liquid accumulated within a component of the refrigeration system, and a controller configured to operate the expansion valve to increase the flow of refrigerant into the evaporator or decrease the flow of refrigerant into the evaporator based on the level of liquid measured by the liquid level sensor.

Abstract: A method includes receiving, by a processing device and from a variable frequency drive coupled to one or more compressors, operation information of the one or more compressors. The method also includes comparing the operation information of the one or more compressors to an operation threshold and determining that the operation information satisfies the operation threshold. The method also includes changing, based on the determination that the operation information of the one or more compressors satisfies the operation threshold, an operation parameter of a component of the refrigeration system. Changing the operation parameter increases at least one of: (i) a velocity of a working fluid in a piping assembly fluidly coupled to the one or more compressors, or (ii) a flow rate of an oil in the piping assembly flowing into the one or more compressors.

Abstract: A cooling system includes a distribution system and a cooling unit. The distribution system is configured to circulate a distribution system refrigerant. The distribution system includes a distribution system pump, a main cooler, a distribution system input conduit, and a distribution system output conduit. The main cooler is configured to receive the distribution system refrigerant from the distribution system pump. The distribution system input conduit is configured to receive the distribution system refrigerant from the main cooler. The distribution system output conduit is configured to receive the distribution system refrigerant from the distribution system input conduit and to provide the distribution system refrigerant to the distribution system pump. The cooling unit is configured to circulate a cooling unit refrigerant. The cooling unit includes a cooling unit pump, an upstream receiver, a condenser, a downstream receiver, and an evaporator.

Abstract: A controller for a refrigeration system includes a processing circuit having one or more processors and memory. The processing circuit is configured to calculate a superheat of a gas refrigerant exiting a first side of a subcooler based on a measured temperature and a measured pressure of the gas refrigerant and compare the calculated superheat to a superheat threshold. In response to a determination that the calculated superheat is less than the superheat threshold, the processing circuit closes an expansion valve to restrict a flow of the gas refrigerant through a second side of the subcooler. In response to a determination that the calculated superheat is equal to or greater than the superheat threshold, the processing circuit operates the expansion valve to drive a temperature of a subcooled liquid refrigerant exiting the second side of the subcooler to a subcooled liquid temperature setpoint.

Abstract: A display case includes multiple walls that define an inner volume, a door, a door actuator, a gesture sensor, and a controller. The door is transitionable between an open position for access to the inner volume and a closed position. The door actuator is configured to transition the door between the open position and the closed position. The gesture sensor is configured to detect a gesture performed by a user. The controller includes a processing circuit configured to obtain sensor data from the gesture sensor that indicates the gesture performed by the user. The processing circuit is further configured to determine if the user has performed a reference gesture using the sensor data. The processing circuit is further configured to operate the door actuator to transition the door between the open position and the closed position in response to determining that the user has performed the reference gesture.

Abstract: A diagnostics system for a display case includes a display case, a display device, and a remote controller, according to some embodiments. The display case includes a local controller, a refrigeration apparatus, and multiple sensors. The remote controller includes a processing circuit configured to receive diagnostics data from the local controller of the display case, according to some embodiments. The processing circuit is configured to identify one or more events using the diagnostics data and assign a rank to each of the one or more events. The processing circuit is configured to promote the rank of each of the one or more events based on an amount of time that each of the one or more events persists. The processing circuit is configured to operate the display device to notify a user regarding the one or more events and the rank of each event.

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.