Numerical Study of Natural Draft Wet Cooling Tower

2011 ◽  
Vol 403-408 ◽  
pp. 3191-3194
Author(s):  
Shui Hua Zheng ◽  
Tai Jin ◽  
Jian Ren Fan
Keyword(s):  
Numerical Simulation ◽  
Thermal Performance ◽  
Cooling Tower ◽  
Numerical Study ◽  
Thermal Power ◽  
Three Dimensional ◽  
Design Calculation ◽  
Simulation Platform ◽  
Computational Accuracy ◽  
Natural Draft

Natural draft wet cooling tower is one of key equipments in thermal power stations, and its thermal performance influences the efficiency of total thermal system. Based on the heat and mass transfer theory and characteristics of the FLUENT software, a three-dimensional numerical simulation platform had been developed to simulate the thermal performance in a natural draft wet cooling tower. This platform was used to study the heat exchange and flow situation of a typical hyperbolic natural draft wet cooling tower. Comparing and analyzing the results of simulation and design calculation, it indicate that there is good computational accuracy of the three-dimensional numerical simulation platform, and the platform can provide a good support for the design and research of natural draft wet cooling tower.

Numerical Study of the Thermal Performance in Natural Draft Wet Cooling Tower with Different Fill Types

2012 ◽  
Vol 562-564 ◽  
pp. 1032-1035
Author(s):  
Shui Hua Zheng ◽  
Tai Jin ◽  
Jian Ren Fan
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Thermal Performance ◽  
Cooling Tower ◽  
Numerical Study ◽  
Three Dimensional ◽  
Natural Draft ◽  
Mass Transfer Theory ◽  
Fluent Software ◽  
Fill Depth

Based on the heat and mass transfer theory and characteristics of the FLUENT software, a three-dimensional numerical simulation platform composed by user defined functions had been developed to simulate the thermal performance in a natural draft wet cooling tower. This platform was used to study a typical hyperbolic natural draft wet cooling tower with different fill types. The variations of the flow and temperature field in the cooling tower caused by the two different methods of fill were investigated. It is found that the outlet water temperature will decrease due to the non-uniform fill depth. The non-uniform fill depth is beneficial to increasing the efficiency of the cooling tower.

Three-Dimensional Numerical Study on Thermal Performance in a Natural Draft Wet Cooling Tower

2012 ◽  
Vol 614-615 ◽  
pp. 169-173
Author(s):  
Shui Hua Zheng ◽  
Tai Jin ◽  
Jian Ren Fan
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Thermal Performance ◽  
Water Distribution ◽  
Cooling Tower ◽  
Numerical Study ◽  
Three Dimensional ◽  
Cooling Efficiency ◽  
Natural Draft ◽  
Mass Transfer Theory

Based on the heat and mass transfer theory and characteristics of the CFD software, a three-dimensional numerical simulation platform had been developed to study the thermal performance in a natural draft wet cooling tower. This platform was validated using the measured results of a running cooling tower. The flow and temperature field in the cooling tower were investigated. It is found that the water temperature and flow field can be correctly calculated using this platform. The cooling efficiency could be improved due to non-uniform fill and water distribution methods.

Numerical Simulation of Gas Flow and Heat Transfer in Cross-Wavy Primary Surface Channel for Microtubine Recuperators

2005 ◽  
Author(s):  
H. X. Liang ◽  
Q. W. Wang ◽  
L. Q. Luo ◽  
Z. P. Feng
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Gas Turbine ◽  
Numerical Study ◽  
High Reliability ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Flow And Heat Transfer ◽  
High Heat Transfer ◽  
The Cross

Three-dimensional numerical simulation was conducted to investigate the flow field and heat transfer performance of the Cross-Wavy Primary Surface (CWPS) recuperators for microturbines. Using high-effective compact recuperators to achieve high thermal efficiency is one of the key techniques in the development of microturbine in recent years. Recuperators need to have minimum volume and weight, high reliability and durability. Most important of all, they need to have high thermal-effectiveness and low pressure-losses so that the gas turbine system can achieve high thermal performances. These requirements have attracted some research efforts in designing and implementing low-cost and compact recuperators for gas turbine engines recently. One of the promising techniques to achieve this goal is the so-called primary surface channels with small hydraulic dimensions. In this paper, we conducted a three-dimensional numerical study of flow and heat transfer for the Cross-Wavy Primary Surface (CWPS) channels with two different geometries. In the CWPS configurations the secondary flow is created by means of curved and interrupted surfaces, which may disturb the thermal boundary layers and thus improve the thermal performances of the channels. To facilitate comparison, we chose the identical hydraulic diameters for the above four CWPS channels. Since our experiments on real recuperators showed that the Reynolds number ranges from 150 to 500 under the operating conditions, we implemented all the simulations under laminar flow situations. By analyzing the correlations of Nusselt numbers and friction factors vs. Reynolds numbers of the four CWPS channels, we found that the CWPS channels have superior and comprehensive thermal performance with high compactness, i.e., high heat transfer area to volume ratio, indicating excellent commercialized application in the compact recuperators.

Three-Dimensional Regularities of Distribution of Air-Inlet Characteristic Velocity in Natural-Draft wet Cooling Tower

2008 ◽  
Vol 20 (3) ◽  
pp. 323-330 ◽  
Author(s):  
Kai Wang ◽  
Feng-zhong Sun ◽  
Yuan-bin Zhao ◽  
Ming Gao ◽  
Yue-tao Shi
Keyword(s):  
Cooling Tower ◽  
Three Dimensional ◽  
Characteristic Velocity ◽  
Natural Draft ◽  
Air Inlet

Numerical Simulation of Flow Fields in a Natural Draft Wet-Cooling Tower

2007 ◽  
Vol 19 (6) ◽  
pp. 762-768 ◽  
Author(s):  
Xiang-liang Yang ◽  
Feng-zhong Sun ◽  
Kai Wang ◽  
Yue-tao Shi ◽  
Nai-hua Wang
Keyword(s):  
Numerical Simulation ◽  
Cooling Tower ◽  
Flow Fields ◽  
Natural Draft

scholarly journals Evaluation of thermal performance for natural and forced draft wet cooling tower

2019 ◽  
Vol 13 (4) ◽  
pp. 6007-6021 ◽  
Author(s):  
M. J. Al-Dulaimi ◽  
F. A. Kareem ◽  
F. A. Hamad
Keyword(s):  
Flow Rate ◽  
Thermal Performance ◽  
Cooling Tower ◽  
Volume Flow Rate ◽  
Volume Flow ◽  
Experimental Results ◽  
Water Volume ◽  
Axial Fan ◽  
Natural Draft ◽  
Forced Draft

This paper presents an experimental and numerical investigation of the thermal performance of natural draft wet cooling tower (NDWCT). The experimental investigation is carried out under natural draft condition and forced draft condition created by an axial fan. The operational parameters considered in this study are the thickness of the fill (10 and 20 cm), inlet water temperature (40, 45, and 50 °C) and inlet water volume flow rate (5.68, 7.75, and 9.46 L/min). The experimental results showed that the thermal performance is improved when the fans are used with the NDWCT. The temperature difference between inlet and outlet and effectiveness increase by 35% and 37.2%, respectively at fill thickness of 20 cm and water volume flow rate of 11.35 L/min. The temperature distribution of the air and the relative humidity were numerically simulated for both cases of natural and forced draft by employing the commercial CFD software ANSYS Fluent 15. The experimental and numerical results were validated with results from a previous work and showed a good agreement. The experimental results showed that the effectiveness increase by 22% and 30% for NDWCT and FDWCT respectively when in case of fill thickness 20 cm.

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