Abstract: A method of determining a composition of a blended working fluid in a climate control system includes detecting a characteristic of a working fluid flowing through a fluid conduit at a location of the fluid conduit using a sensor; calculating a first concentration of a first refrigerant of the blended working fluid at the location; and calculating a second concentration of the second refrigerant of the blended working fluid at the location. The calculating the first concentration of the first refrigerant is based on the characteristic and stored information. The stored information includes a first stored value of the first refrigerant and a second stored value of a second refrigerant. The calculating the second concentration of the second refrigerant is based on the characteristic and the stored information. The calculating is based only upon the characteristic and the stored information.

Abstract: A method of determining a composition of a blended working fluid in a climate control system includes detecting a characteristic of a working fluid flowing through a fluid conduit at a location of the fluid conduit using a sensor; calculating a first concentration of a first refrigerant of the blended working fluid at the location; and calculating a second concentration of the second refrigerant of the blended working fluid at the location. The calculating the first concentration of the first refrigerant is based on the characteristic and stored information. The stored information includes a first stored value of the first refrigerant and a second stored value of a second refrigerant. The calculating the second concentration of the second refrigerant is based on the characteristic and the stored information. The calculating is based only upon the characteristic and the stored information.

Abstract: A refrigeration control system includes: a refrigerant including a blend of a first refrigerant and a second refrigerant; an accumulator; a compressor that receives the refrigerant from the accumulator and compresses the refrigerant; a first heat exchanger disposed downstream of the compressor; a receiver disposed downstream of the first heat exchanger; a first valve disposed between the liquid-to-suction heat exchanger and the receiver; a second valve disposed between the receiver and a second heat exchanger, the second heat exchanger, where the second heat exchanger receives the refrigerant from the second valve and at least partially vaporizes the refrigerant and outputs the at least partially vaporized refrigerant to the liquid-to-suction heat exchanger; and a control module configured to selectively adjust a speed of the compressor based on adjusting (a) a temperature of air output from the second heat exchanger and into a space toward (b) a setpoint temperature within the space.

Abstract: A refrigeration control system includes: a refrigerant including a blend of a first refrigerant and a second refrigerant; an accumulator; a compressor that receives the refrigerant from the accumulator and compresses the refrigerant; a first heat exchanger disposed downstream of the compressor; a receiver disposed downstream of the first heat exchanger; a first valve disposed between a liquid-to-suction heat exchanger and the receiver; a second valve disposed between the receiver and a second heat exchanger, wherein the second heat exchanger receives the refrigerant from the second valve and at least partially vaporizes the refrigerant and outputs the at least partially vaporized refrigerant to the liquid-to-suction heat exchanger; and a control module configured to selectively adjust a speed of the compressor based on adjusting (a) a temperature of air output from the second heat exchanger and into a space toward (b) a setpoint temperature within the space.

Abstract: A charging device includes: a first inlet configured to receive a first refrigerant in vapor form; a second inlet configured to receive the first refrigerant in liquid form; a third inlet configured to receive a second refrigerant in liquid form, where the second refrigerant is a different type of refrigerant than the first refrigerant; an outlet configured to output the first and second refrigerants to a refrigeration system; a first valve fluidly connected between the first inlet and the outlet; a second valve fluidly connected between the second inlet and the outlet; a third valve fluidly connected between the third inlet and the outlet; and a control module configured to selectively open the first, second, and third valves and charge the refrigeration system with target amounts of the first and second refrigerants, respectively.

Abstract: Exemplary embodiments are disclosed systems configured for using setpoint changes for defrosting evaporator coils. Also disclosed are exemplary methods of using setpoint changes for defrosting evaporator coils.

Abstract: A charging device includes: a first inlet configured to receive a first refrigerant in vapor form; a second inlet configured to receive the first refrigerant in liquid form; a third inlet configured to receive a second refrigerant in liquid form, where the second refrigerant is a different type of refrigerant than the first refrigerant; an outlet configured to output the first and second refrigerants to a refrigeration system; a first valve fluidly connected between the first inlet and the outlet; a second valve fluidly connected between the second inlet and the outlet; a third valve fluidly connected between the third inlet and the outlet; and a control module configured to selectively open the first, second, and third valves and charge the refrigeration system with target amounts of the first and second refrigerants, respectively.

Abstract: A vapor compression system includes a compressor including a compression stage for compressing a working fluid, a first heat exchanger downstream from the compressor that receives and cools the working fluid, a second heat exchanger downstream from the first heat exchanger and upstream from the compressor that receives and heats the working fluid, and an accumulator positioned between the second heat exchanger and the compression stage. The accumulator defines an interior volume for containing a vapor phase and a liquid phase of the working fluid, and the accumulator includes an inlet to receive the working fluid from the second heat exchanger and an outlet to allow the vapor phase of the working fluid to exit the accumulator and flow towards the compression stage. The accumulator atomizes the liquid phase of the working fluid into droplets and introduces the droplets into the vapor phase of the working fluid exiting the accumulator.

Abstract: A vapor compression system includes an indoor heat exchanger, an outdoor heat exchanger, a compressor, a first valve, and a second valve. The compressor has an inlet connected to a suction flow and an exit connected to a discharge flow. The first valve is movable to connect the discharge flow to one of the indoor and outdoor heat exchangers. The second valve is movable to connect the suction flow to one of the indoor and outdoor heat exchangers.

Abstract: A system may include a first compressor, a second compressor, a first heat exchanger and a second heat exchanger. The first compressor has a first inlet and a first outlet. The second compressor is a sumpless compressor and has a second inlet and a second outlet. The second compressor provides working fluid discharged from the second outlet to the first compressor. The first heat exchanger is disposed upstream of the second compressor and provides working fluid to the second compressor. The second heat exchanger is disposed upstream of the first compressor and provides working fluid to the first compressor.

Abstract: A refrigerant control system includes: a charge module configured to determine an amount of refrigerant that is present within a first portion of a refrigeration system within a building; and an isolation module configured to selectively open and close an isolation valve of the refrigeration system and to, via the isolation valve, maintain the amount of refrigerant within the first portion within the building below a predetermined amount of the refrigerant.

Abstract: A refrigerant control system includes: a charge module configured to determine an amount of refrigerant that is present within a refrigeration system of a building; a leak module configured to diagnose that a leak is present in the refrigeration system based on the amount of refrigerant; and at least one module configured to take at least one remedial action in response to the diagnosis that the leak is present in the refrigeration system.

Abstract: A refrigerated food container system includes a container defining an inner volume and a thermoelectric module arranged in thermal contact with at least one surface of the container. The thermoelectric module includes a first thermoelectric cooling device and a second thermoelectric cooling device in thermal contact with the first thermoelectric cooling device. A control module is configured to provide a first voltage to the first thermoelectric cooling device and provide a second voltage to the second thermoelectric cooling device.

Abstract: Systems and methods for purging lubricant from a first compressor to a second compressor are provided. A control module receives a lubricant purge command, shuts the second compressor to an OFF-mode while the first compressor remains in the ON-mode, restricts working fluid from an outlet of the second compressor from flowing into the first compressor and allows compressed working fluid discharged from an outlet of the first compressor to flow into the inlet of the second compressor such that lubricant in the second compressor flows into the first compressor.

Abstract: A refrigerant control system includes: a charge module configured to determine an amount of refrigerant that is present within a refrigeration system of a building; a leak module configured to diagnose that a leak is present in the refrigeration system based on the amount of refrigerant; and at least one module configured to take at least one remedial action in response to the diagnosis that the leak is present in the refrigeration system.

Abstract: A refrigerant control system includes: a charge module configured to determine an amount of refrigerant that is present within a first portion of a refrigeration system within a building; and an isolation module configured to selectively open and close an isolation valve of the refrigeration system and to, via the isolation valve, maintain the amount of refrigerant within the first portion within the building below a predetermined amount of the refrigerant.

Abstract: A refrigerant control system includes: a charge module configured to determine an amount of refrigerant that is present within a refrigeration system of a building; a leak module configured to diagnose that a leak is present in the refrigeration system based on the amount of refrigerant; and at least one module configured to take at least one remedial action in response to the diagnosis that the leak is present in the refrigeration system.

Abstract: A refrigeration system includes first and second compressors, a condenser, first and second evaporators, and a valve. The first compressor is fluidly connected to first suction and discharge lines. The second compressor is fluidly connected to second suction and discharge lines. The second suction line is fluidly connected to the first discharge line. The condenser receives refrigerant from the second compressor. The first evaporator receives refrigerant from the condenser and discharges refrigerant to the first suction line. The second evaporator receives refrigerant from the condenser and discharges refrigerant to the second suction line. The valve is disposed between the first evaporator and the first suction line. The first suction line receives refrigerant when the valve is in a first position. The second suction line receives refrigerant when the valve is in a second position. The first compressor is bypassed when the valve is in the second position.

Abstract: A refrigeration system includes first and second compressors, a condenser, first and second evaporators, and a valve. The first compressor is fluidly connected to first suction and discharge lines. The second compressor is fluidly connected to second suction and discharge lines. The second suction line is fluidly connected to the first discharge line. The condenser receives refrigerant from the second compressor. The first evaporator receives refrigerant from the condenser and discharges refrigerant to the first suction line. The second evaporator receives refrigerant from the condenser and discharges refrigerant to the second suction line. The valve is disposed between the first evaporator and the first suction line. The first suction line receives refrigerant when the valve is in a first position. The second suction line receives refrigerant when the valve is in a second position. The first compressor is bypassed when the valve is in the second position.

Abstract: A refrigeration system includes first and second compressors, a condenser, first and second evaporators, and a valve. The first compressor is fluidly connected to first suction and discharge lines. The second compressor is fluidly connected to second suction and discharge lines. The second suction line is fluidly connected to the first discharge line. The condenser receives refrigerant from the second compressor. The first evaporator receives refrigerant from the condenser and discharges refrigerant to the first suction line. The second evaporator receives refrigerant from the condenser and discharges refrigerant to the second suction line. The valve is disposed between the first evaporator and the first suction line. The first suction line receives refrigerant when the valve is in a first position. The second suction line receives refrigerant when the valve is in a second position. The first compressor is bypassed when the valve is in the second position.