| 摘要 |
PURPOSE: To reduce the width of variations of temperature in a cold keeping unit and hence prevent temperature in the unit from being made uneven by forming a heat exchange element on a ceiling surface and a side wall surface of the unit, and substantially continuously operating the element to keep the temperature in the unit unchanged. CONSTITUTION: A flow passage 3 for a cooling medium fluid of a refrigerant producer 2 is formed over a wide region on a ceiling 11 of a cold keeping unit 1 and on an inner surface side of a side wall 12 of the same. A circulation passage for a fluid 6 is formed between the flow passage 3 and a temperature controlled bath 4. The fluid 6 cooled in the temperature controlled bath 4 to a predetermined temperature is fed to the flow passage 3 and is passed therethrough and is further returned to the temperature controlled bath 4. Accordingly, the refrigerant producer 2 serves as a supplier for a predetermined temperature cooling medium fluid for the cold keeping unit 1 while the flow passage 3 serves as a heat exchange element to keep air in the cold keeping unit 1 and other cold keeping medium gases at a set temperature. As a result, the width of variations of the temperature in the cold keeping unit 1 can be reduced and hence temperature is prevented from being made uneven. |
