scholarly journals Utilization of the lateral accelerated cross-wind to improve the cooling performance of a natural draft dry cooling tower

2019 ◽  
Vol 23 (Suppl. 4) ◽  
pp. 1013-1024 ◽  
Author(s):  
Weiliang Wang ◽  
Junfu Lyu ◽  
Hai Zhang ◽  
Qing Liu ◽  
Guangxi Yue ◽  
...  
Keyword(s):  
Cooling Tower ◽  
Collecting Duct ◽  
Ventilation Rate ◽  
Lateral Flow ◽  
Wind Condition ◽  
Coal Consumption ◽  
Flow Acceleration ◽  
Natural Draft ◽  
Dry Cooling Tower ◽  
Dry Cooling

Cross-wind degrades the performance of a natural draft dry cooling tower (NDDCT). Based on the basic affecting mechanism, this paper introduces a wind collecting approach. By using a wind collecting duct, the lateral flow acceleration of cross-wind is broken up, and the lateral flow kinetic energy is utilized to increase the lateral and rearward static pressure outside the radiator inlet. By adoption of a CFD model, the effect of the wind collecting approach is investigated comprehensively. It is found that the wind collecting ducts could improve the pressure distribution around the radiator bundle, reinforce the lateral air intake, and reduce the intensity of mainstream vortices, so as to enhance the ventilation rate of a NDDCT. For an outstanding performance, the two-duct wind collecting scheme is suggested, which may assure a NDDCT working in an approximately wind free manner in all investigated cross-wind range, and increase the ventilation rate by ~63% under the high cross-wind condition, which may reduce the overall coal consumption by 23500~33500 tons annually for a 660 MW coal-fired unit. The numerical results are confirmed by a hot state modelling experiment conducted in a wind tunnel.

Fresh breeze cuts down one-third ventilation rate of a natural draft dry cooling tower: A hot state modelling

2018 ◽  
Vol 131 ◽  
pp. 1-7 ◽  
Author(s):  
Weiliang Wang ◽  
Yuzhao Wang ◽  
Hai Zhang ◽  
Guanming Lin ◽  
Junfu Lu ◽  
...  
Keyword(s):  
Cooling Tower ◽  
Ventilation Rate ◽  
Natural Draft ◽  
Dry Cooling Tower ◽  
Dry Cooling

scholarly journals Simultaneous effects of water spray and crosswind on performance of natural draft dry cooling tower

2013 ◽  
Vol 17 (2) ◽  
pp. 443-455 ◽  
Author(s):  
Hossein Ahmadikia ◽  
Mohsen Soleimani ◽  
Ehsan Gholami
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Rate ◽  
Transfer Rate ◽  
Cooling Tower ◽  
Wind Condition ◽  
Water Spray ◽  
Natural Draft ◽  
Spray System ◽  
Dry Cooling Tower ◽  
Dry Cooling

To investigate the effect of water spray and crosswind on the effectiveness of the natural draft dry cooling tower (NDDCT), a three-dimensional model has been developed. Efficiency of NDDCT is improved by water spray system at the cooling tower entrance for high ambient temperature condition with and without crosswind. The natural and forced heat convection flow inside and around the NDDCT is simulated numerically by solving the full Navier-Stokes equations in both air and water droplet phases. Comparison of the numerical results with one-dimensional analytical model and the experimental data illustrates a well-predicted heat transfer rate in the cooling tower. Applying water spray system on the cooling tower radiators enhances the cooling tower efficiency at both no wind and windy conditions. For all values of water spraying rate, NDDCTs operate most effectively at the crosswind velocity of 3m/s and as the wind speed continues to rise to more than 3 m/s up to 12 m/s, the tower efficiency will decrease by approximately 18%, based on no-wind condition. The heat transfer rate of radiator at wind velocity 10 m/s is 11.5% lower than that of the no wind condition. This value is 7.5% for water spray rate of 50kg/s.

Numerical investigation of swirl effects on a short natural draft dry cooling tower under windless and crosswind conditions

2021 ◽  
Vol 188 ◽  
pp. 116628 ◽  
Author(s):  
Yuchen Dai ◽  
Yuanshen Lu ◽  
Alexander Y. Klimenko ◽  
Ying Wang ◽  
Kamel Hooman
Keyword(s):  
Numerical Investigation ◽  
Cooling Tower ◽  
Natural Draft ◽  
Dry Cooling Tower ◽  
Dry Cooling

scholarly journals Wind-break walls with optimized setting angles for natural draft dry cooling tower with vertical radiators

2017 ◽  
Vol 112 ◽  
pp. 326-339 ◽  
Author(s):  
Huan Ma ◽  
Fengqi Si ◽  
Yu Kong ◽  
Kangping Zhu ◽  
Wensheng Yan
Keyword(s):  
Cooling Tower ◽  
Natural Draft ◽  
Dry Cooling Tower ◽  
Dry Cooling

Ventilation enhancement for a natural draft dry cooling tower in crosswind via windbox installation

2018 ◽  
Vol 137 ◽  
pp. 93-100 ◽  
Author(s):  
Weiliang Wang ◽  
Hai Zhang ◽  
Junfu Lyu ◽  
Qing Liu ◽  
Guangxi Yue ◽  
...  
Keyword(s):  
Cooling Tower ◽  
Natural Draft ◽  
Dry Cooling Tower ◽  
Dry Cooling

Preliminary Design of Dry Cooling Tower for the Closed Cycle Gas Turbine HTGR

1981 ◽  
Author(s):  
A. Montakhab
Keyword(s):  
Heat Exchanger ◽  
Gas Turbine ◽  
Cooling Tower ◽  
Waste Heat ◽  
Cross Flow ◽  
Preliminary Design ◽  
Closed Cycle ◽  
Natural Draft ◽  
Dry Cooling Tower ◽  
Dry Cooling

Because of its relatively high coolant temperature, the closed cycle gas turbine HTGR is well adapted to dry cooling and its waste heat can be rejected with relatively low cost. The preliminary design of natural-draft dry cooling towers for a 1200 MW(e) GT-HTGR is presented. The effects of air approach velocity, capacity rates of air and water mediums, and number of heat exchanger cross flow passes on salient tower and heat exchanger dimensions are studied. Optimum tower designs are achieved with three cross flow passes for the heat exchanger, resulting in a simultaneous minimization of tower height, heat exchanger surface area and circulating water pumping power. Four alternative tower designs are considered and their relative merits are compared. It is concluded that the 1200 MW(e) plant can be cooled by a single tower design which is well within the present state of the natural-draft dry cooling tower technology. In comparison, the fossil-fired or HTGR steam plants of the same output is shown to need three such towers.

Sign in / Sign up

Export Citation Format

Share Document