| 摘要 |
A multiplicity of water passage pipes (4) are received in a horizontal, cylindrical-shaped drum (3), which is provided at an upper portion thereof with a discharge port (3a) and an inflow port (3b) for a refrigerant. Fixed to both ends of the drum (3) are a water introduction cylinder (6) and a discharge cylinder (7), which is bent downward to be substantially L-shaped. A heat exchanger (1) is secured such that en end thereof on a side of the discharge cylinder (7) is disposed above a cold water tank (2). An interior of the cold water tank (2) is divided into a first tank (2a) and a second tank (2b) by a partition (8), over which water can flow. A piping for supplying a cold water to a facility for utilization of the cold water is connected to a bottom or a lower portion of the first tank (2a), on which the cold water from the heat exchanger (1) falls. A path for water recovery from the facility for utilization of the cold water is connected to the second tank (2b) through a return piping (11). The second tank (2b) is connected to a side of the water introduction cylinder (6) of the heat exchanger (1) through a cold water circulating pump (12). When water circulation for the heat exchanger (1) is stopped, water in the heat exchanger (1) is discharged to fall in the cold water tank (2), thereby preventing freezing.
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