Patent ID: 7908039
Filing Date: 2011-03-15
Classification: F25B,F25D,Y02B

Abstract:
1. A method of operating a cooling storage cabinet including a cooling device for internal cooling of the cooling storage cabinet, the cooling device including an inverter compressor, and a rotational speed of the inverter compressor being capable of being changed between a plurality of stages, said method comprising: prestoring a cooling characteristic as data, the cooling characteristic representing a time-varying change of a predetermined physical amount, the physical amount corresponding to a target time-varying drop of internal temperature; detecting the physical amount at a plurality of predetermined sampling times; and changing the rotational speed of the inverter compressor between each of the plurality of stages based on the detected physical amounts at the plurality of predetermined sampling times, said changing the rotational speed of the inverter compressor changes the physical amount in accordance with a target cooling characteristic, wherein the rotational speed of the inverter compressor in each of the plurality of stages is set in a manner that enables the adjacent stages in the plurality of stages to have larger differences in rotational speed as the rotational speed increases.