| 摘要 |
PROBLEM TO BE SOLVED: To improve cooling efficiency without increasing a coolant amount in a refrigeration apparatus using a mixed coolant, wherein if an outer diameter of a heat transfer tube composing a cooling coil or a length of the heat transfer tube is increased to increase a surface area of the cooling coil, not only the amount of the mixed coolant increases, it causes inconvenience of changing a mixing ratio of each coolant in the mixed coolant, and such inconvenience becomes more prominent when providing a product by sealing just a predetermined amount of the mixed coolant of a predetermined composition in a coolant circuit, for example. SOLUTION: The cooler 52 is connected to the coolant circuit, and it is provided in its interior with the heat transfer tube 9 formed with a coolant passage 93. In the heat transfer tube 9, a cross-sectional shape of its coolant passage 93 is annularly formed. COPYRIGHT: (C)2008,JPO&INPIT
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