Abstract: While an inverter compressor 32 is driven in a control range, an actual temperature drop S is calculated based on a detected inside temperature TR at every predetermined sampling time. Further, a target temperature drop Ac for the inside temperature TR is taken out of data on a cooling characteristic Xc. If the actual temperature drop S is smaller than the target temperature drop Ac, the inverter compressor 32 is controlled to increase a speed thereof. If it is larger, the inverter compressor 32 is controlled to decrease the speed. Inside of a cold storage is cooled down along the cooling characteristic Xc through those controls. Especially after the inside temperature TR has decreased from an upper limit temperature TH and reached the target temperature To, the speed of the inverter compressor 32 is controlled such that the target temperature drop remains at substantially zero (cooling characteristic Xc2).

Abstract: A cooling apparatus such as a refrigerator includes a refrigeration cycle including a compressor driven by an electric motor, a condenser, a throttle valve and an evaporator, a first physical amount detector capable of detecting a physical quantity representing a temperature of an object to be cooled by the cooling operation of the evaporator, a temperature control device capable of controlling a rotating speed of the motor based on the physical quantity detected by the first physical quantity detector so that the object is cooled approximately to a target temperature, a second physical quantity detector capable of detecting a physical quantity corresponding to a performance margin of the refrigeration cycle, and a rotating speed limiter capable of limiting the rotating speed of the motor to or below a predetermined speed based on a physical quantity detected by the second physical quantity detector.

Abstract: A refrigeration device 30 includes two independent refrigeration circuits: the first refrigeration circuit 31A having an inverter compressor 32A and the second refrigeration circuit 31B having a constant-speed compressor 32B. An evaporator 37 is shared by both refrigeration circuits 31A, 31B. The inverter compressor 32A is normally driven and the constant-speed compressor 32B is additionally driven as necessary. The evaporator 37 includes a group of fins 41 having a plurality of fins 40 positioned along an airflow direction and arranged with a gap therebetween in a direction across the airflow direction. Evaporation tubes are routed in four tiers while penetrating through the fins 40 in the group of fins 41 and running in a zigzag in the airflow direction. The first evaporation tube 45A of the first refrigeration circuit 31A is arranged in the lower two tiers and the second evaporation tube 45B of the second refrigeration circuit 31B is arranged in the upper two tiers.

Abstract: While an inverter compressor 32 is driven in a control range, an actual temperature drop S is calculated based on a detected inside temperature TR at every predetermined sampling time. Further, a target temperature drop Ac for the inside temperature TR is taken out of data on a cooling characteristic Xc. If the actual temperature drop S is smaller than the target temperature drop Ac, the inverter compressor 32 is controlled to increase a speed thereof. If it is larger, the inverter compressor 32 is controlled to decrease the speed. Inside of a cold storage is cooled down along the cooling characteristic Xc through those controls. Especially after the inside temperature TR has decreased from an upper limit temperature TH and reached the target temperature To, the speed of the inverter compressor 32 is controlled such that the target temperature drop remains at substantially zero (cooling characteristic Xc2).

Abstract: In controlled cooling operation, data on the controlled cooling operation characteristics is read out from a memory and compared with a drop degree of an inside temperature actually measured by an inside temperature sensor 46, and a cooling device is operated so that the inside temperature drops following a temperature curve stored in advance. A state where the inside temperature is higher than the set temperature by 7 K or more lasts for 15 minutes, for example, the cooling capacity by the cooling device is increased than the cooling capacity based on control of a controlled operation controller so that even if a door 17 is frequently opened/closed and the inside temperature tends to gradually rise, it can be detected at an early stage and kept close to the set temperature.

Abstract: A cooling apparatus such as a refrigerator includes a refrigeration cycle including a compressor driven by an electric motor, a condenser, a throttle valve and an evaporator, a first physical amount detector capable of detecting a physical quantity representing a temperature of an object to be cooled by the cooling operation of the evaporator, a temperature control device capable of controlling a rotating speed of the motor based on the physical quantity detected by the first physical quantity detector so that the object is cooled approximately to a target temperature, a second physical quantity detector capable of detecting a physical quantity corresponding to a performance margin of the refrigeration cycle, and a rotating speed limiter capable of limiting the rotating speed of the motor to or below a predetermined speed based on a physical quantity detected by the second physical quantity detector.

Abstract: In controlled cooling operation, data on the controlled cooling operation characteristics is read out from a memory and compared with a drop degree of an inside temperature actually measured by an inside temperature sensor 46, and a cooling device is operated so that the inside temperature drops following a temperature curve stored in advance. A state where the inside temperature is higher than the set temperature by 7K or more lasts for 15 minutes, for example, the cooling capacity by the cooling device is increased than the cooling capacity based on control of a controlled operation controller so that even if a door 17 is frequently opened/closed and the inside temperature tends to gradually rise, it can be detected at an early stage and kept close to the set temperature.