Air Equalizing Mechanism in Cooling Performance Improvement of Vertical Delta-Type Radiators

Tiefeng Chen, Qian Zhao (), Yaoming Zhang, Chengjun Wang, Kaiming Li, Shixing Li, Longtao Quan and Yuanbin Zhao ()
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Tiefeng Chen: CHN Energy Pingluo Power Co., Ltd., Shizuishan 753000, China
Qian Zhao: School of Energy and Power Engineering, Shandong University, Jing-Shi Road 17932#, Jinan 250061, China
Yaoming Zhang: CHN Energy Pingluo Power Co., Ltd., Shizuishan 753000, China
Chengjun Wang: CHN Energy Pingluo Power Co., Ltd., Shizuishan 753000, China
Kaiming Li: CHN Energy Pingluo Power Co., Ltd., Shizuishan 753000, China
Shixing Li: CHN Energy Pingluo Power Co., Ltd., Shizuishan 753000, China
Longtao Quan: CHN Energy Pingluo Power Co., Ltd., Shizuishan 753000, China
Yuanbin Zhao: School of Energy and Power Engineering, Shandong University, Jing-Shi Road 17932#, Jinan 250061, China

Energies, 2024, vol. 17, issue 5, 1-21

Abstract: Based on the design and measured data of one actual tower, a three-dimensional numerical model for a natural draft dry cooling tower (NDDCT) was created and validated under constant heat load. This enabled the performance improvement mechanism of air equalizing on vertical delta-type radiators (VDRs) to be clarified by detailed analysis of key parameters, such as the exit water temperature, heat transfer coefficient, and mass airflow. Under the impact of typical ambient crosswind, all VDRs were retrofitted with air-side-equalizing devices. It was found that the exit water temperatures of the whole NDDCT decreased by 0.865 °C, 0.593 °C and 0.186 °C under the studied ambient crosswind speeds of 2.5 m/s, 4 m/s and 12 m/s, respectively. The performance improvement mechanism of air-side equalizing was investigated for three VDRs, which were located on the upwind, tower lateral, and downwind sides under crosswind impacts. Besides the studied VDRs, the performance of the neighboring VDRs behind them was also improved by the optimized aerodynamic field and the reduced hot wind recirculation around them. In addition, the average heat transfer coefficients of the VDRs were enhanced, which could lay the foundation for improving the cooling performance of thermodynamic devices with VDRs.

Keywords: NDDCT; vertical delta-type radiator; air-side equalizing; aerodynamic field optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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