| 摘要 |
PURPOSE:To improve operating efficiency for a partial load by controlling capacity of a small capacity compressor alone, and by controlling on/off for the operation of a middle capacity compressor. CONSTITUTION:When the required power to obtain the required freezing ability for a freezing load of a freezer 2 is defined as 22.5HP, rated capacity of a compressor 1b is defined as 10HP, while for a compressor 1c, as 7.5HP, and for a compressor 1d, as 5HP. Capacity of the compressor 1d is altered to 0.3HP, or to 5HP through a capacity control part 1i. In a control part 3, operation control is carried out by the capacity control part 1i using the compressor 1d alone as 60% capacity control operation, or by commercial ac supply operation using either the compressor 1d or the compressor 1c alone, or by combination of the compressors 1b through 1d, according to the load capacity. |
