The present disclosure provides a refrigeration device including a circuit having an evaporator, a compressor, a condenser, and an expansion valve orderly connected by a refrigerant flow path. The refrigeration device further includes a first sensor to sense ambient temperature, second sensor to sense evaporator inlet temperature, a microwave module disposed proximal to the evaporator to generate microwaves, and a controller coupled to the first sensor, the second sensor and the microwave module. The controller determines whether a difference in temperature value between the ambient temperature and the evaporator inlet temperature is equal to or greater than a first predetermined temperature value, and initiates operation of the microwave module to heat an inlet of the evaporator when the difference in temperature value between the ambient temperature and the evaporator inlet temperature is equal to or greater than the first predetermined temperature value.

An air conditioning system and a defrosting control method and device thereof including: obtaining defrosting exit time determined in previous defrosting, and controlling the air conditioning system to perform this defrosting according to the defrosting exit time determined in the previous defrosting; in this defrosting process of the air conditioning system, obtaining the temperature of an outdoor environment, and obtaining the temperature of an outlet of an outdoor heat exchanger; determining the temperature of the outdoor environment and the temperature of the outlet of the outdoor heat exchanger; and if the temperature of the outlet of the outdoor heat exchanger is lower than a first preset temperature and lasts a preset time and the temperature of the outdoor environment is lower than a second preset temperature, obtaining forced defrosting time serving as the defrosting exit time of the next defrosting of the air conditioning system, and storing the time.

An air conditioning system and a defrosting control method and device thereof including: obtaining defrosting exit time determined in previous defrosting, and controlling the air conditioning system to perform this defrosting according to the defrosting exit time determined in the previous defrosting; in this defrosting process of the air conditioning system, obtaining the temperature of an outdoor environment, and obtaining the temperature of an outlet of an outdoor heat exchanger; determining the temperature of the outdoor environment and the temperature of the outlet of the outdoor heat exchanger; and if the temperature of the outlet of the outdoor heat exchanger is lower than a first preset temperature and lasts a preset time and the temperature of the outdoor environment is lower than a second preset temperature, obtaining forced defrosting time serving as the defrosting exit time of the next defrosting of the air conditioning system, and storing the time.

According to one embodiment, an air conditioner includes an indoor unit, an outdoor unit, and a controller. The controller includes a first defrost module and a second defrost module. The first defrost module is configured to defrost a first outdoor heat exchanger and a second outdoor heat exchanger at the same time. The second defrost module is configured to start defrosting of the second outdoor heat exchanger in advance, and to perform defrosting of the first outdoor heat exchanger after the start of defrosting of the second outdoor heat exchanger.

According to one embodiment, an air conditioner includes an indoor unit, an outdoor unit, and a controller. The controller includes a first defrost module and a second defrost module. The first defrost module is configured to defrost a first outdoor heat exchanger and a second outdoor heat exchanger at the same time. The second defrost module is configured to start defrosting of the second outdoor heat exchanger in advance, and to perform defrosting of the first outdoor heat exchanger after the start of defrosting of the second outdoor heat exchanger.

A continuous heating control system and method, and an air-conditioning device. The system includes a defrosting solenoid valve (1) arranged on a bypass pipeline, wherein one end of the bypass pipeline is connected to an oil separator (2), and the other end of the bypass pipeline is connected to an outdoor heat exchanger (3); and a heating structure which is arranged at the bottom of a gas separator (4) and used for heating the gas separator (4).

An air conditioner switches between a normal refrigeration cycle and a defrosting refrigeration cycle, and includes: a refrigerant circuit that connects a first heat exchanger, a second heat exchanger, a radiation panel, and an expansion valve that regulates a flow rate of a refrigerant flowing through the radiation panel; and a controller that causes the air conditioner to switch between the normal refrigeration cycle and the defrosting cycle. During the normal refrigeration cycle, the radiation panel performs cooling or heating. During the defrosting cycle, the first heat exchanger serves as a radiator and the second heat exchanger serves as an evaporator. During the defrosting cycle, the controller causes the expansion valve to be in a fully closed state.

An outdoor unit of an air-conditioning apparatus includes a heat exchange body including a plurality of flat tubes that extend in a vertical direction and that are arranged in a horizontal direction with gaps therebetween. A plurality of the heat exchange bodies are arranged in a direction of air flow to form a heat exchanger. A first header, into which hot gas refrigerant flows from a refrigerant circuit, is provided below one of the plurality of the heat exchange bodies that is at a most upwind position.

An air-conditioning unit that is able to suppress ignition at an electric heater even when leakage of refrigerant occurs while a low-GWP refrigerant is used is provided. In an outdoor unit (20) including a casing (60), a compressor (21) provided inside the casing (60) and configured to compress refrigerant containing 1,2-difluoroethylene, and a drain pan heater (54) provided inside the casing (60), an electric power consumption of the drain pan heater (54) is lower than or equal to 300 W.

An operation control system includes a storage unit that stores electric-power information, and a determination unit. The determination unit determines, based on the electric-power information, a special-operation timing at which a special operation of a refrigerant cycle apparatus installed in at least one property or at least one area is to be executed. The electric-power information includes at least one of electric-power supply demand adjustment request information related to an electric-power supply demand adjustment request from an outside to the property or the area, and electric-power market price information related to an electric-power market price. The special operation includes at least one of a cooling-time oil return operation during a cooling operation of the refrigerant cycle apparatus, a heating-time oil return operation during a heating operation of the refrigerant cycle apparatus, and a defrosting operation during a heating operation of the refrigerant cycle apparatus.