Air Gap between Protective Screen and Surface of Reinforced Concrete Cooling Tower

2014 ◽  
Vol 1044-1045 ◽  
pp. 457-461 ◽  
Author(s):  
Yury G. Barabanshikov ◽  
Svetlana Belyaeva ◽  
Maria Antonova ◽  
Mihail Zapoev
Keyword(s):  
Cooling Tower ◽  
Air Gap ◽  
Optimum Thickness ◽  
Optimal Parameters ◽  
Effective Protection ◽  
Cold Surface ◽  
Air Inlet ◽  
Effects Of Temperature ◽  
Concrete Shell ◽  
Protective Screen

The article considers the problem of effective protection of the cooling tower shell using the screen with a ventilated air gap. The aim is to determine the optimal parameters of the air gap. In operation, the calculations were performed showing the effects of temperature conditions and the thickness of the gap on the aerodynamic and thermal modes of operation. The article made conclusions based on the done calculations. The optimum thickness of the gap, provided heating air inlet, which provides the ability to assimilate air moisture throughout the layer and delete it in the atmosphere, which in the future will eliminate condensation on the cold surface of a concrete shell.

Field measurement on the three-dimensional thermal characteristics of a single air inlet induced draft cooling tower

2020 ◽  
Vol 172 ◽  
pp. 115167
Author(s):  
Xuehong Chen ◽  
Fengzhong Sun ◽  
Xin Li ◽  
Huadong Song ◽  
Peng Zheng ◽  
...  
Keyword(s):  
Field Measurement ◽  
Cooling Tower ◽  
Three Dimensional ◽  
Thermal Characteristics ◽  
Air Inlet

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

scholarly journals Investigation on the Optimum Design of Heat Exchangers in a Hybrid Closed Circuit Cooling Tower

1970 ◽  
Vol 37 ◽  
pp. 52-57
Author(s):  
MMA Sarker
Keyword(s):  
Heat Exchanger ◽  
Optimum Design ◽  
Heat Exchangers ◽  
Cooling Tower ◽  
Cooling Capacity ◽  
Closed Circuit ◽  
Design Parameters ◽  
Air Inlet ◽  
Staggered Arrangement ◽  
Temperature And Pressure

Investigation on the optimum design of a heat exchanger in a Hybrid Closed Circuit Cooling Tower having a rated capacity of 1RT is performed experimentally. The heat exchanger of dimension 0.4mx0.33mx0.572m has 15x7 bare type 15.88mm OD copper coils in staggered arrangement. The relevant design parameters were selected based on the typical East Asian meteorological constrains for the year-round smooth operation of the cooling tower. This study presents results related to the cooling capacity and the cooling efficiency with respect to wet bulb temperature and pressure drop with respect to air inlet velocity. Results are also presented in terms of number of transfer units (NTU). Cooling capacity was found to be close to the rated one for the wet mode but low in dry mode operation. Keywords: Hybrid closed circuit cooling tower, Cooling capacity, Wet mode, Dry modedoi:10.3329/jme.v37i0.820Journal of Mechanical Engineering Vol.37 June 2007, pp.52-77

scholarly journals Calculation of the Temperature in Ventilated Air Gap of Reinforced Concrete Cooling Tower

2015 ◽  
Vol 123 ◽  
pp. 41-49 ◽  
Author(s):  
Barabanshikov Yurii ◽  
Belyaeva Svetlana ◽  
Antonova Maria ◽  
Vasiutina Sofia
Keyword(s):  
Reinforced Concrete ◽  
Cooling Tower ◽  
Air Gap

A New Two-Dimensional CFD Model to Predict the Performance of Natural Draught Wet-Cooling Towers Packed With Trickle or Splash Fills

2010 ◽  
Author(s):  
Hanno C. R. Reuter ◽  
Detlev G. Kro¨ger
Keyword(s):  
Cooling Tower ◽  
Air Flow ◽  
Linear Interpolation ◽  
Atmospheric Temperature ◽  
Performance Characteristics ◽  
Cooling Towers ◽  
Cfd Model ◽  
Flow Angle ◽  
Cfd Models ◽  
Air Inlet

In the design of a modern natural draught wet-cooling tower, structural and performance characteristics must be considered. Air flow distortions and resistances must be minimised to achieve optimal cooling which requires that the cooling towers must be modelled two-dimensionally and ultimately three-dimensionally to be optimized. It is found that CFD models in literature are limited to counterflow cooling towers packed with film fills which are porous in one direction only and generally have a high pressure drop, as well as purely crossflow cooling towers packed with splash fill, which simplifies the analysis considerably. Many counterflow cooling towers are however packed with trickle and splash fills which have anisotropic flow resistances, which means the fills are porous in all flow directions and thus air flow can be oblique through the fill, particularly near the cooling tower air inlet. This provides a challenge since available fill test facilities and subsequently fill performance characteristics are limited to purely counter- and crossflow configuration. This paper presents a CFD model to predict the performance of natural draught wet-cooling tower with any type of fill configuration, which can be used to investigate the effects of different atmospheric temperature distributions, air inlet and outlet geometries, air inlet heights, variations in radial water loading and fill depth, fill configurations, rain zone drop size distributions, and spray zone performance characteristics on cooling tower performance for optimization purposes. Furthermore the effects of damage or removal of fill in annular sections and boiler flue gas discharge in the centre of the tower can be investigated. The fill performance characteristics for oblique air flow are determined by linear interpolation between counter- and crossflow fill characteristics in terms of the air flow angle. The CFD results are validated by means of corresponding one-dimensional computational model data.

X-ray guided modes produced by Bragg reflections of multilayers: an analytical treatment

2005 ◽  
Vol 38 (4) ◽  
pp. 595-602 ◽  
Author(s):  
I. R. Prudnikov
Keyword(s):  
Air Gap ◽  
Maximum Intensity ◽  
Multilayer Structures ◽  
Optimal Parameters ◽  
Analytical Treatment ◽  
X Ray ◽  
Guided Mode ◽  
Guided Modes ◽  
Mode Excitation ◽  
Analytical Expressions

It is analytically shown that X-ray Bragg reflections from periodical multilayer structures can be used for the excitation of guided modes. The X-ray guided modes in (i) a guiding film embedded in a periodical multilayer and (ii) an air gap between two space-separated multilayers have been considered. In the former case, analytical expressions have been obtained which describe a resonant X-ray intensity enhancement taking place inside the guiding film under the guided mode excitation. Optimal parameters of the waveguide have been found, which are needed to achieve a maximum intensity gain. In the latter case, eigen guided modes arising in the air gap have been determined. Properties of the eigen modes have been studied.

scholarly journals An experimental investigation on air-side performances of finned tube heat exchangers for indirect air-cooling tower

2014 ◽  
Vol 18 (3) ◽  
pp. 863-874 ◽  
Author(s):  
Xueping Du ◽  
Yantao Yin ◽  
Min Zeng ◽  
Pengqing Yu ◽  
Qiuwang Wang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Cooling Tower ◽  
Finned Tube ◽  
Air Cooling ◽  
Flat Tube ◽  
Tube Heat Exchanger ◽  
Air Inlet ◽  
Oval Tube

A tremendous quantity of water can be saved if the air cooling system is used, comparing with the ordinary water-cooling technology. In this study, two kinds of finned tube heat exchangers in an indirect air-cooling tower are experimentally studied, which are a plain finned oval-tube heat exchanger and a wavy-finned flat-tube heat exchanger in a cross flow of air. Four different air inlet angles (90?, 60 ?, 45?, and 30?) are tested separately to obtain the heat transfer and resistance performance. Then the air-side experimental correlations of the Nusselt number and friction factor are acquired. The comprehensive heat transfer performances for two finned tube heat exchangers under four air inlet angles are compared. For the plain finned oval-tube heat exchanger, the vertical angle (90?) has the worst performance while 45? and 30? has the best performance at small ReDc and at large ReDc, respectively. For the wavy-finned flat-tube heat exchanger, the worst performance occurred at 60?, while the best performance occurred at 45? and 90? at small ReDc and at large ReDc, respectively. From the comparative results, it can be found that the air inlet angle has completely different effects on the comprehensive heat transfer performance for the heat exchangers with different structures.

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