| 摘要 |
The present invention relates to a method in connection with a refrigeration apparatus (1), wherein a circulating medium is circulated in a pipework (5a, 5b, 5c, 5d) by a compressor (2). The circulating medium is liquefied in a condenser (6) and is evaporated in an evaporator (4). The compressor is driven by a high-speed electric machine (2f). In the method, one substance belonging to the perfluoro-carbons is used as the circulating medium. The invention also relates to a refrigeration apparatus (1) which comprises a compressor (2), a pipework (5a, 5b, 5c, 5d) for circulating the circulating medium by a compressor (2), a condenser (3) for liquefying the circulating medium, and an evaporator (4) for evaporating the circulating medium. The compressor comprises a shaft (2c) provided with a bearing assembly (2d, 2e), and an electric machine (2f) for driving the compressor. One substance belonging to the perfluorocarbons, such as C5F12, is arranged to be used as the circulating medium in the refrigeration apparatus (1).
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