| 摘要 |
PROBLEM TO BE SOLVED: To accurately eliminate gas occurring in a refrigerant liquid feeding pipe line in startup to attain smooth operation, in a natural circulation type cooling device that utilizes the elevation difference between a heat exchanger for air conditioning and a condenser to naturally circulate refrigerant.SOLUTION: A condenser 3 is arranged at a higher place than a heat exchanger 2 for air conditioning, and they are connected by a refrigerant gas return pipe line 6 and a refrigerant liquid feeding pipe line 7. In the refrigerant liquid feeding pipe line 7, an expansion valve 13 is arranged in the vicinity of the heat exchanger 2 for air conditioning. A bypass passage 14 is connected in a state of straddling the expansion valve 13, and a relief valve 15 is provided in the bypass passage 14. When a pressure sensor 16 detects excessive low pressure of the refrigerant liquid feeding pipe line 7, gas is discharged to the side of the heat exchanger 2 for air conditioning by opening the relief valve 15. Since gas is discharged in the dedicated bypass passage 14, gas is rapidly and surely discharged. |
