scholarly journals The Effect of Air Parameters on the Evaporation Loss in a Natural Draft Counter-Flow Wet Cooling Tower

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6174
Author(s):  
Wei Yuan ◽  
Fengzhong Sun ◽  
Ruqing Liu ◽  
Xuehong Chen ◽  
Ying Li
Keyword(s):  
Temperature Difference ◽  
Heat Dissipation ◽  
Cooling Tower ◽  
Air Humidity ◽  
Counter Flow ◽  
Natural Draft ◽  
Evaporation Loss ◽  
Relative Air Humidity ◽  
Evaporation Heat ◽  
Rate Of Evaporation

The measures to reduce the impact of evaporation loss in a natural draft counter-flow wet cooling tower (NDWCT) have important implications for water conservation and emissions reduction. A mathematical model of evaporation loss in the NDWCT was established by using a modified Merkel method. The NDWCTs in the 300 MW and 600 MW power plant were taken as the research objects. Comparing experimental values with calculated values, the relative error was less than 3%. Then, the effect of air parameters on evaporation loss of NDWCT was analyzed. The results showed that, with the increase of dry bulb temperature, the evaporation heat dissipation and the evaporation loss decreased, while the rate of evaporation loss caused by unit temperature difference increased. The ambient temperature increased by 1 °C and the evaporation loss was reduced by nearly 26.65 t/h. When the relative air humidity increased, the evaporation heat dissipation and evaporation loss decreased, and the rate of evaporation loss caused by unit temperature difference decreased. When relative air humidity increased by 1%, the outlet water temperature rose by about 0.08 °C, and the evaporation loss decreased by about 5.63 t/h.

Effect of Thermal Load on Evaporation Loss of Natural Draft Counter-Flow Wet Cooling Towers

2020 ◽  
Vol 12 (5) ◽  
Author(s):  
Wei Yuan ◽  
Fengzhong Sun ◽  
Xuehong Chen ◽  
Ruqing Liu
Keyword(s):  
Mathematical Model ◽  
Thermal Load ◽  
Power Plants ◽  
Cooling Towers ◽  
Counter Flow ◽  
Natural Draft ◽  
Evaporation Loss ◽  
Mass Flowrate ◽  
Rate Of Evaporation ◽  
Good Agreement

Abstract Based on the Merkel method, a mathematical model for calculating the evaporation loss of natural draft counterflow wet cooling towers (NDWCTs) was established. Taking the NDWCTs of the representative 300 MW and 600 MW power plants as the experimental objects, the calculated values obtained by the mathematical method were in good agreement with field experiment. Then, the effect of thermal load on evaporation loss of NDWCT was analyzed. The results showed that with the thermal load of NDWCT increasing, the evaporation loss increased, while the rate of evaporation loss caused by per unit change in temperature decreased. When the thermal load is the same, the evaporation loss was basically equal no matter by changing the mass flowrate or the inlet water temperature.

scholarly journals Analisa Kebutuhan Make Up Water Cooling Tower RSG-GAS pada Daya 30 MW Setelah Revitalisasi

2020 ◽  
Vol 17 (1) ◽  
pp. 38
Author(s):  
Pranto Busono ◽  
Santosa Pujiarta
Keyword(s):  
Cooling Tower ◽  
Water Cooling ◽  
Counter Flow ◽  
Evaporation Loss

Akibat kondisi dan usia dari cooling tower RSG-GAS maka telah dilakukan revitalisasi pada cooling tower tersebut. Cooling tower yang baru mempunyai tipe sama dengan tipe sebelumnya, yaitu tipe Mechanical induced draft, counter flow, Inline, Closed end. Akibat penggantian/revitalisasi cooling tower RSG-GAS maka perlu dilakukan kajian yang berkaitan dengan besarnya kehilangan air. Kehilangan air pada cooling tower terdiri atas: evaporation loss (We), Drift loss (Wd) dan blowdown (Wb). Besarnya kehilangan air berdasarkan desain 93,8074 m3/h, hasil perhitungan 53,1286 m3/h dan hasil pengamatan adalah sebesarnya 39,4548 m3/h. Kehilangan air pada cooling tower perlu dilakukan perhitungan karena berkaitan dengan kemampuan pompa PA-04 dalam mengkompensasi kehilangan air tersebut. Dengan kemampuan pompa PA-04 yang mempunyai kapasitas 100 m3/h, maka dapat dipastikan bahwa pompa PA-04 masih mampu untuk mengkompensasi kehilangan air di cooling tower.   Kata kunci : make up water, revitalisasi cooling tower, kehilangan air

scholarly journals Effect of change factors on evaporation loss based on cold end system in natural draft counter-flow wet cooling towers

2021 ◽  
Vol 16 (2) ◽  
pp. JTST0015-JTST0015
Author(s):  
Wei YUAN ◽  
Fengzhong SUN ◽  
Ruqing LIU ◽  
Xuehong CHEN ◽  
Ying LI
Keyword(s):  
Cooling Towers ◽  
Counter Flow ◽  
Natural Draft ◽  
Evaporation Loss ◽  
Change Factors

Discuss of Important Issues in Numerical Simulation for Natural Draft Counter Flow Cooling Tower

2012 ◽  
Vol 516-517 ◽  
pp. 267-270
Author(s):  
Li Song ◽  
Rui Tian ◽  
Song Li ◽  
Ya Hui Wang
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Mass Transfer ◽  
Drop Size ◽  
Cooling Tower ◽  
Drop Diameter ◽  
Atmospheric Density ◽  
Counter Flow ◽  
Natural Draft ◽  
Calculation Results

natural draft counter flow cooling tower heat and mass transfer numerical simulation has been widely used to optimize the cooling tower design and to improve the thermal efficiency, but in published papers, a few important problems is not attracted attention, such as how does impact grid density to the calculation results; how does impact change of atmospheric density to the calculation results; drop diameter is an important parameter in numerical simulation, but it is not a exact experimental data, it is important to discuss how does impact drop size to the calculation results. This paper will explore and analyze these issues in the numerical simulation.

scholarly journals Management of air flows inside steel silo during grain storage

2020 ◽  
Vol 17 ◽  
pp. 00108
Author(s):  
I. A. Kechkin ◽  
V.A. Ermolaev ◽  
A.I. Romanenko ◽  
V.V. Tarakanova ◽  
K.D. Buzetti
Keyword(s):  
Temperature Difference ◽  
Air Humidity ◽  
Wheat Grain ◽  
Long Term Storage ◽  
Relative Air Humidity ◽  
Condensate Formation ◽  
Effects Of Temperature ◽  
Condensed Moisture ◽  
Term Storage

A study was conducted concerning effects of temperature and relative air humidity during long-term storage of wheat grain in a steel silo. The study was aimed at identifying the possibility of condensed moisture appearing under the silo roof. The probable periods of condensate in the space under the silo roof depending on the temperature difference inside and outside the silo have been determined. Some ways to prevent the condensate formation are proposed in the paper.

scholarly journals Performance Enhancement of Induced Draft Counter Flow Wet Cooling Tower with Different Types of Modified Shaped Fill Assembly

2020 ◽  
pp. 41-53
Author(s):  
Suman Dewanjee ◽  
Sheikh Muhammad Humayun Kabir ◽  
Uschuas Dipta Das
Keyword(s):  
Cooling Tower ◽  
Performance Enhancement ◽  
Cooling Capacity ◽  
Counter Flow ◽  
Cross Sectional ◽  
Performance Factors ◽  
Evaporation Loss ◽  
Percent Loss ◽  
Different Types ◽  
Wetted Surface Area

This paper presents an experimental analysis of heat transfer using different shaped fills in a counter flow induced draft cooling tower. The main objective is to determine and compare the characteristics of the cooling tower using newly shaped (splash and film) fills and the regular used fills. The newly shaped fills are inverted U-shape cross-sectional splash fill and film fill with ripple plates. The obtained results show that the performance is affected by the type and arrangement of the fills. The modified splash fill has increased the wetted surface area of fill within the same volume compared to regular fills. The film fill with ripple plates has been used     such that water from the distribution device ran down on both surfaces of each ripple plate. By the arrangement of ripple plates, cooling loss by premature dropping off of water has been avoided. Performance factors like range, approach, effectiveness, cooling capacity, evaporation loss, percent loss are calculated from collected data for newly shaped fills, and regular shaped fills. It is observed that range, effectiveness, and cooling capacity increases with both newly shaped fills. When ripple plated film fill is used; range, effectiveness, and cooling capacity is found highest among the different shape of fills used in this study. At the same time evaporation loss and percent loss are found lowest for inverted-U shaped splash fill.

Visco-elastic changes of vocal fold mucosa related to high and low relative air humidity

2000 ◽  
Vol 25 (4) ◽  
pp. 329-330
Author(s):  
R.J.B. Hemler ◽  
G.H. Wieneke ◽  
P.H. Dejonckere
Keyword(s):  
Vocal Fold ◽  
Air Humidity ◽  
Relative Air Humidity
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