| 摘要 |
A refrigerating apparatus, wherein the capacity of a compressor (21) is set based on a Froude number Fr during the washing operation. The Froude number represents the ratio of the inertia force of a gas refrigerant flowing in a gas side communication tube (70) to a gravity acting on a fluid in the gas side communication tube (70). During the washing operation, the capacity of the compressor (21) is set so that the Froude number Fr is equal to or larger than 1, and the inertia force of the gas refrigerant flowing in the gas side communication tube (70) becomes larger than the gravity acting on the fluid containing mineral oils and foreign matters in the gas side communication tube (70). Accordingly, the fluid containing the mineral oils and foreign matters is pushed up by the gas refrigerant also at the vertical portion of the gas side communication tube (70). Thus, the mineral oils and foreign matters remaining in an existing fluid side communication tube (60) and the gas side communication tube (70) can be collected.
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