390 / 2018-12-20 16:43:04

Numerical Simulation of the Influence of Arrangement Distance of Two Nozzles on Evaporative Cooling Performance

Air-cooled tower；two nozzles；arrangement distances；evaporative cooling performance；numerical simulation

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A major bottleneck in the application of Solar Thermal Power Generation is the cooling problem. Most solar thermal power plants are built in areas where water resources are extremely scarce, which restricts the application of water cooling technology and therefore air cooling has become an inevitable choice. But the cooling performance of air-cooled tower is lower than that of water-cooled tower, which is even more evident in high temperature periods in summer. The cooling performance of air-cooled tower can be improved with a certain amount of water evaporation to pre-cool the entering air of the tower. The water evaporation is introduced by nozzle spray. Nozzle arrangement is one of the important issues affecting the cooling performance of the water spray pre-cooled towers. Therefore, this study is to simulate the evaporative cooling process of two nozzles with different arrangement distances. The aim of the current study is to explore the influence of arrangement distance of two nozzles on evaporative cooling performance and to provide reference for multi-nozzle arrangement. The simulation will be carried out in a geometric space with a cross-section of 1m?m and a length of 10m. The nozzles are located at 0.5m downstream from the air inlet, and nozzle spray direction is the same as the airflow direction. Taking two hollow-conical nozzles as an example, ANSYS Fluent 18.2 is used to simulate the nozzle arrangement distances where the spray coverage of the two nozzles is partially overlapped, tangential and separated at the exit section. Besides, the influence of air speed on evaporative cooling performance will be considered. The influence of two-nozzle arrangement distance on evaporative cooling performance for concurrent flow can be obtained through this study, which will provide reference for multi-nozzle arrangement.