MULTISTAGE COMPRESSION TURBINE TYPE COOLING SYSTEM AND MULTISTAGE COMPRESSION TURBINE TYPE COOLING METHOD

To provide a multistage compression turbine type cooling system that can increase/decrease refrigerating capacity without decreasing refrigerating efficiency, and a cooling method thereof.SOLUTION: A multistage compression turbine type cooling system 1A comprises: a main heat exchanger 2; an auxiliary heat exchanger 3; a first stage side turbocompressor 4a, a second stage side turbocompressor 4b, and a third stage side turbocompressor 4c that are three units constituting a maximum of three stages; a first stage side driving motor 5a, a second stage side driving motor 5b, and a third stage side driving motor 5c that are three units corresponding to the three stages; an expansion turbine 6; a first stage side water-cooled cooler 7a, a second stage side water-cooled cooler 7b, and a third stage side water-cooled cooler 7c; a valve 8a between the main heat exchanger and the first stage side compressor, a valve 8b between the first stage side and second stage side compressors, and a first stage side compressor bypass valve 8c; a first circulation path L1; and a second circulation path L2.SELECTED DRAWING: Figure 1 【課題】冷凍効率を落とさずに冷凍能力を増減させることができる多段圧縮タービン式冷却システム及びその冷却方法を提供する。【解決手段】主熱交換器２と、副熱交換器３と、最大３段を構成する３基の１段側ターボ圧縮機４ａ、２段側ターボ圧縮機４ｂ、及び３段側ターボ圧縮機４ｃと、その３段に対応した３基の１段側駆動モータ５ａ、２段側駆動モータ５ｂ、及び３段側駆動モータ５ｃと、膨張タービン６と、１段側水冷クーラー７ａ、２段側水冷クーラー７ｂ、及び３段側水冷クーラー７ｃと、主熱交換器／１段側圧縮機間弁８ａ、１段側／２段側圧縮機間弁８ｂ、及び１段側圧縮機バイパス弁８ｃと、第１の循環経路Ｌ１と、第２の循環経路Ｌ２と、を備える多段圧縮タービン式冷却システム１Ａを選択する。【選択図】図１