Refrigeration apparatus

A refrigeration apparatus comprising:

• an inner box with an internal space enclosed by a top surface, a side surface, and a bottom surface;
• and
• a two-way refrigeration circuit including a high-temperature side refrigeration circuit and a low-temperature side refrigeration circuit, which are configured to exchange heat with each other, wherein:
• the internal space is partitioned by a partition plate into a plurality of cooling chambers, among which ventilation is enabled,
• the low-temperature side refrigeration circuit includes a low-temperature side evaporator that is a pipe disposed outside the inner box, the pipe including a top surface part in contact with the top surface, an upper side surface part in contact with the side surface, and a lower side surface part in contact with the side surface at a position lower than the upper side surface part so as to surround the internal space,
• the upper side surface part includes a plurality of pipe sections arranged at even intervals of a first pitch in a vertical direction,
• the lower side surface part includes a plurality of pipe sections arranged at even intervals of a second pitch greater than the first pitch in the vertical direction,
• the upper side surface part is directly connected to the lower side surface part at the side surface of the inner box,
• a sum of lengths of a pipe forming the top surface part and the pipe forming the upper side surface part is equal to or greater than 62.5% of a length of the pipe in contact with the inner box, and
• a length of a pipe in contact with the bottom surface is smaller than 8.0% of the length of the pipe in contact with the inner box.