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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

FIELD TEST ON THE COOLING PERFORMANCE FOR HIGH LEVEL WATER COLLECTING WET COOLING TOWER UNDER CROSSWIND CONDITIONS

DOI: 10.1615/IHTC16.cov.023003
pages 3535-3540

Jian Zou
School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Yang Zhou
School of Energy and Power Engineering, Shandong University, Jinan 250061

Zhigang Dang
School of Energy and Power Engineering, Shandong University, Jinan 250061

Fengzhong Sun
School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Ming Gao
School of Energy and Power Engineering, Shandong University, Jinan 250061, China


KEY WORDS: Convection, Thermodynamics, field test, high level water collecting wet cooling tower, cooling performance, crosswind

Abstract

Under crosswind conditions, field test was conducted on the high level water collecting wet cooling tower (HWCT) of a 1000MW unit to investigate cooling performance under circulating water flowrate Q, the change rules of cooling efficiency η and Merkel number N were analyzed. The results showed that crosswind appears a continuously adverse effect on the cooling performance with the rise of velocity. θ represents the angle between cross walls and crosswind direction, at the same crosswind velocity and circulating water flowrate, the cooling performance under θ1=5° is more superior than that under θ2=35°. In addition, at the same θ angle and circulating water flowrate, the higher the crosswind velocity is, the worse the thermal performance becomes. Taking 69553t/h condition as an example, when the crosswind velocity reaches to 3.74m/s, under θ1=5° conditions, compared with that of 0.28m/s condition, η and N reduced 18.29% and 12.54%, however, under θ2=35° conditions, η and N decreased 23.81% and 13.58%, respectively. Moreover, at the same crosswind velocity and θ angle, both η and N are inversely proportional to Q, however, the larger the circulating water flowrate is, the better the adaptability of HWCTs to the crosswind is.

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