Numerical simulation on the enhancement of heat transfer performance by deflector plates for the mechanical draft cooling towers

Youhao Wang, Jichong Yang, Qinghua Xu, Qiang Zhang, Suoying He and Ming Gao

Energy, 2023, vol. 283, issue C

Abstract: To optimize the uneven distribution of flow field in the mechanical draft cooling towers, four cases for deflector plates are proposed. Based on the analysis of the velocity and temperature fields in the tower, the effect of the deflector plates to strengthen the local heat transfer is investigated. In addition, the thermal and ventilation performance is investigated with different fan speed and circulating water flow rate. The results show that the arrangement of the deflector plates can guide the ambient air into the inefficient heat transfer region. Of the four cases studied, Case 4 has the optimal performance. Compared with the original tower, the outlet water temperature reduces by 0.22 °C, the cooling efficiency increases by 1.53%, and the Merkel number increases by 6.35%, while the ventilation rate keeps at 699 m3/s. The thermal performance of Case 4 is better than that of the original tower when only the fan speed or the circulating water flow rate are changed, and it is improved with the increase of the fan speed and the decrease of the circulating water flow rate. This paper can guide the optimization of enhanced local heat transfer in mechanical draft cooling towers.

Keywords: Mechanical draft cooling towers; Deflector plates; Thermal and ventilation performance; Numerical simulation (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:283:y:2023:i:c:s0360544223025744

DOI: 10.1016/j.energy.2023.129180

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