The present invention relates to a refrigerator and to an apparatus and method for refrigerator diagnosis. More particularly, the refrigerator converts product information and outputs a tone when a command for storing data and performing a diagnosis is inputted during operation. The refrigerator diagnosis apparatus receives the tone and diagnoses the state of or presence of defects in the refrigerator based on the data contained in the product information so as to analyze the cause of the defect and propose countermeasures to repair the refrigerator. Thus, the diagnosis of defects may be accurately and easily performed upon the occurrence of defect in the refrigerator.

A refrigerator and a method for controlling a refrigerator are provided. The method may include driving a refrigerating cycle including a first evaporator and a second evaporator by activating at least one compressor, supplying refrigerant to the first and second evaporators by controlling a flow adjuster, recognizing whether the refrigerant is unequally introduced into the first or second evaporator, by sensing a temperature of the first or second evaporator through at least one temperature sensor, reducing supply of the refrigerant to the first or second evaporator into which the refrigerant is unequally introduced, by adjusting the flow adjuster, storing information about an operation time of the flow adjuster, recognizing whether the at least one temperature sensor has malfunctioned, and determining an operation time of the flow adjuster according to whether the at least one temperature sensor has malfunctioned.

A control system and method for a frostless, multivariable coupling and heat pump-based hot blast stove are used for grain drying. A first heat exchanger, a second heat exchanger, a main solution pool, corresponding pipelines, and a temperature detector are configured in the control system. A first heat pump unit, a second heat pump unit and a third heat pump unit are formed. A preheating zone, a low temperature zone, a medium temperature zone and a high temperature zone are sequentially formed on an air supply pipeline from a fresh air inlet to a fresh air outlet. A frostless operation procedure is provided. Through the configuration, the control system and method for a frostless, multivariable coupling and heat pump-based hot blast stove can implement heat supply in a gradient heat-circulation preheating mode and a gradient heat-circulation frostless mode.

A control system and method for a frostless, multivariable coupling and heat pump-based hot blast stove are used for grain drying. A first heat exchanger, a second heat exchanger, a main solution pool, corresponding pipelines, and a temperature detector are configured in the control system. A first heat pump unit, a second heat pump unit and a third heat pump unit are formed. A preheating zone, a low temperature zone, a medium temperature zone and a high temperature zone are sequentially formed on an air supply pipeline from a fresh air inlet to a fresh air outlet. A frostless operation procedure is provided. Through the configuration, the control system and method for a frostless, multivariable coupling and heat pump-based hot blast stove can implement heat supply in a gradient heat-circulation preheating mode and a gradient heat-circulation frostless mode.

An air conditioner which is able to prevent leaked refrigerant gas from disadvantageously stagnating at a part of a room space when leakage of refrigerant gas occurs in an indoor unit is provided.

An air conditioner of the present invention includes an indoor unit having an upper outlet port and a lower outlet port and uses flammable refrigerant, the air conditioner including: a shutter provided at the lower outlet port and is configured to switch between a blowout capable state in which wind is blown out and a blowout incapable state in which no wind is blown out; a refrigerant gas sensor provided in the indoor unit, and a controlling unit configured to control the shutter. In a driving state in which the lower outlet port is in the blowout incapable state, when the refrigerant gas sensor detects the refrigerant gas, the controlling unit switches the lower outlet port from the blowout incapable state to the blowout capable state.

An aircraft passenger service device for receiving goods for cold storage to be supplied to aircraft passengers includes a receiving device having a viewing apparatus, a coolant inlet for feeding a coolant into the receiving device, and a coolant outlet for discharging the coolant from the receiving device. The viewing apparatus is designed to enable a user to inspect goods stored in the receiving device before removal. The aircraft passenger service device further includes a cooling arrangement having a coolant circuit line connected to the coolant inlet and the coolant outlet of the receiving device, and a device that directs into the coolant circuit line a refrigerant fluid flowing through a refrigerant fluid circuit line of a central cooling system of the aircraft.

A refrigerant recovery management system includes a first generation unit and a second generation unit. The first generation unit generates first information to send a refrigerant recovered from refrigerant-use equipment to a refrigerant treatment practitioner that conducts refrigerant treatment on the refrigerant. The second generation unit generates second information on the refrigerant treatment, to report the refrigerant treatment to a manager that manages refrigerant recovery.

A controller for a heat, ventilation, and air conditioning (HVAC) unit may comprise a compressor control signal output; a condenser fan control signal output; a pressure sensor input that receives information regarding an output pressure of the compressor; a temperature input that receives information regarding ambient temperature; a processor coupled to the compressor control signal output, the condenser fan control signal output, the first pressure sensor input, and the temperature input; and a computer-readable memory that stores instructions. The processor may cause the controller to: turn on the compressor via the compressor control signal output based on a request for air conditioning, select a condenser fan speed, from condenser fan control data stored in the computer readable memory, based on the ambient temperature and an output pressure of the compressor, and set a speed of the condenser fan to the selected condenser fan speed via the condenser fan control signal.

A heat-pump circuit may include an indoor heat exchanger, an outdoor heat exchanger, a compressor adapted to circulate a working fluid between the indoor and outdoor heat exchangers, and an expansion device disposed between the indoor and outdoor heat exchangers. A monitor for the heat-pump system may include a return-air temperature sensor, a supply-air temperature sensor, and a processor. The return-air temperature sensor may be adapted to measure a first air temperature of air upstream of the indoor heat exchanger. The supply-air temperature sensor may be adapted to measure a second air temperature of air downstream of the indoor heat exchanger. The processor may be in communication with the return-air temperature sensor and the supply-air temperature sensor. The processor may be programmed to determine a working-fluid-charge condition of the heat-pump system based on the first and second air temperatures.

A heat-pump circuit may include an indoor heat exchanger, an outdoor heat exchanger, a compressor adapted to circulate a working fluid between the indoor and outdoor heat exchangers, and an expansion device disposed between the indoor and outdoor heat exchangers. A monitor for the heat-pump system may include a return-air temperature sensor, a supply-air temperature sensor, and a processor. The return-air temperature sensor may be adapted to measure a first air temperature of air upstream of the indoor heat exchanger. The supply-air temperature sensor may be adapted to measure a second air temperature of air downstream of the indoor heat exchanger. The processor may be in communication with the return-air temperature sensor and the supply-air temperature sensor. The processor may be programmed to determine a working-fluid-charge condition of the heat-pump system based on the first and second air temperatures.