A method for controlling a refrigerator includes providing an initial input value to a heater configured to supply heat to an evaporator, performing a continuous operation of the heater based on the initial input value to increase a temperature of the evaporator to a predetermined temperature, determining a period of time taken to increase the temperature of the evaporator to the predetermined temperature, determining whether the period of time is within a reference period of time, operating the heater based on a first input value that is equal to the initial input value based on a determination that the period of time is outside of the reference period of time, and operating the heater based on a second input value that is less than the initial input value based on a determination that the period of time is within the reference period of time.

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.

A method of automatically controlling a refrigerated device that includes a refrigeration system with an evaporator and an evaporator temperature sensor involves: (a) monitoring an output of the evaporator temperature sensor; (b) based upon monitored temperatures from (a), identifying when a rate of change in temperature indicated by the evaporator temperature sensor satisfies a set rate of change condition and determining if the temperature indicated by the evaporator temperature sensor when the rate of change satisfies to the set rate of change condition is consistent with a predefined expected temperature condition; (c) if the temperature indicated by the evaporator temperature sensor is consistent with the predefined expected temperature condition, taking a first refrigeration control action; and (d) if the temperature indicated by the evaporator temperature sensor is not consistent with the predefined expected temperature condition, taking a second refrigeration control action that is different than the first refrigeration control action.

An air-cooled refrigerator and a control method, a control system and controller for defrosting thereof are provided. The high-temperature air of the air-cooled refrigerator exchanges heat with the evaporator in the air duct and is sent into a refrigerating compartment through the operation of a fan; when the evaporator is gradually frosted, the heat-exchanged air suffers the resistance from the frosts on the evaporator during the flow and the fan slows down. Based on this principle, the fan speed can directly correspond to the frost accumulation mass of the evaporator. The actual frost accumulation mass of the evaporator can be directly determined by determining the fan speed. When the fans peed is decreased to a certain low speed, it means that there is much frost on the evaporator and the defrosting needs to be started timely. As a result, the problems of large energy consumption and poor fresh-keeping effect caused by the traditional control method of defrosting in advance or delayed defrosting can be solved, and the energy-saving and fresh-keeping effects of the air-cooled refrigerator can be improved.

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.

A method for controlling a refrigerator includes operating a heater of the refrigerator in a first mode to increase a temperature of an evaporator of the refrigerator to a predetermined temperature, the first mode comprising a continuous operation of the heater, determining a period of time taken to increase the temperature of the evaporator to the predetermined temperature, determining whether the period of time is within a reference period of time, maintaining operation of the heater in the first mode based on a determination that the period of time is outside of the reference period of time, and operating the heater in a second mode that is different from the first mode based on a determination that the period of time is within the reference period of time.

There is disclosed a controlling method for a refrigerator comprising: a first defrosting step of performing defrosting for an evaporator, the first defrosting step which ends when the temperature of the evaporator reaches a first temperature; a pressure difference sensing step of measuring a difference between the pressure in a first through-hole arranged between an inlet hole for drawing air from a storage compartment and the evaporator and the pressure in a second through-hole arranged between an outlet hole for discharging air towards the storage compartment and the evaporator by using one differential pressure sensor; and a second defrosting step of performing additional defrosting for the evaporator when the measured pressure difference is a preset pressure or more.

A heat pump system includes a heat exchanger coil and a heater configured to transfer heat to the heat exchanger coil. The heat pump system also includes a controller communicatively coupled to the heater. The controller is configured to activate the heater in response to determining that a detected temperature of the heat exchanger coil is below a threshold temperature for a threshold time period.

A method for controlling a refrigerator includes providing an initial input value to a heater configured to supply heat to an evaporator, performing a continuous operation of the heater based on the initial input value to increase a temperature of the evaporator to a predetermined temperature, determining a period of time taken to increase the temperature of the evaporator to the predetermined temperature, determining whether the period of time is within a reference period of time, operating the heater based on a first input value that is equal to the initial input value based on a determination that the period of time is outside of the reference period of time, and operating the heater based on a second input value that is less than the initial input value based on a determination that the period of time is within the reference period of time.

A dual redundant cooling system for a container is provided. The dual redundant cooling system includes a first cooling unit and a second cooling unit. The first cooling unit is positioned in a first cabinet attached to the container. The first cooling unit includes a first controller operating a first cooling loop to cool an interior of the container. The second cooling unit is positioned in a second cabinet attached to the container and adjacent the first cabinet. The second cooling unit includes a second controller operating a second cooling loop to cool the interior of the container. The first cooling unit and the first cooling loop are separate from the second cooling unit and the second cooling loop. The first controller and the second controller communicate a switch signal between each other so that either the first cooling unit is a primary cooling unit operating the first cooling loop or the second cooling unit is the primary cooling unit operating the second cooling loop. The switch signal switching the primary cooling unit. The system interface box positioned in the second cabinet and connected to the first cooling unit and the second cooling unit. The system interface box has a first switch adapted to power on or power off the first cooling unit and a second switch adapted to power on or power off the second cooling unit.