ABSTRACT
In the passive containment cooling system (PCS), the separated heat pipe heat exchanger is of great significance for the heat dissipation in the containment. It is urgent to carry out experimental research on the heat transfer performance of large-scale separated heat pipes (SHP). In this paper, a test device is built, and the thermal stratification degree of the cooling water tank, the field of water temperature change, and the thermal characteristics of the SHP are tested and analyzed through the distribution change of the temperature field of the water tank in the test system. The results show that the temperature field distribution difference in the test water tank is mainly manifested in the vertical height direction, and the maximum temperature difference does not exceed 3°C; the SHP has a good regulation and control effect on the uniform temperature field of the water tank; at a heat load within the range of 1.6-6.8 kW, the SHP has better adaptability. When the temperature of the water tank is in an unsteady state, there is a proportional relationship between the heat load in the water tank and the heat dissipation capacity of the SHP; as the temperature of the water tank becomes stable, the fluctuation of the average heat transfer coefficient at the evaporating end and the condensing end decreases. Therefore, the overall heat dissipation effect of the SHP radiator meets the design requirements.
