| 摘要 |
PROBLEM TO BE SOLVED: To save electricity necessary for securing water temperature suitable for breeding seafood and reduce running cost.SOLUTION: A heat exchange type water tank 10 includes a cylindrical outer wall 22 and a cylindrical bulkhead 24. An area between the outer wall 22 and the bulkhead 24 forms an annular heat medium water area 28 of a fixed width, and an area between the bulk head 24 and a pillar 26 forms an annular breeding water area 30 of a fixed width larger than the width of the heat medium water area 28. By the heat exchange between the breeding water area 30 and the heat medium water area 28 that face each other across the bulkhead 24, the water temperature of the breeding water area 30 can be changed. Underground water pumped up from an underground constant temperature layer is injected into the heat medium water area 28, and is used as a cooling medium to lower the water temperature in the breeding water area 30.SELECTED DRAWING: Figure 1 |
