• Title/Summary/Keyword: Drop-Tower

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Performance Characteristics of Small Sized Cross-flow Cooling Tower (소형 직교류형 냉각탑의 성능 특성에 관한 연구)

  • Sarker, M.M.A.;Kim, E.P.;Kim, J.D.;Jun, C.H.;Moon, C.G.;Yoon, J.I.
    • Journal of Power System Engineering
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    • v.9 no.2
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    • pp.93-98
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    • 2005
  • The performance of cooling tower is dependent on the thermal performance of the packings. It's assessed by heat transfer rate and fan power. In this study, new packing was developed for application in compact type cross-flow cooling tower. The packing characteristic curve and the pressure drop curve were obtained by measuring packing characteristic values and pressure drops of small sized filler in comparison to existing mid-large sized filler. The heat transfer characteristics on small sized filler are about 66% higher than existing mid-large sized filler. The pressure drop characteristics on small sized filler are about two times of the pressure drop characteristics on existing mid-large sized filler.

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Effect of Filler on the Flow of Counter Flow Type Cooling Tower (충진재(Filler)가 대향류형(Counter Flow Type) 냉각탑 유동에 미치는 영향에 대한 연구)

  • Shin, Jeong-Hoon;Lee, Jun-Kyoung;Jin, Cheol-Gyu
    • Journal of the Korean Society of Industry Convergence
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    • v.25 no.4_2
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    • pp.565-572
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    • 2022
  • The white plume from the cooling tower can be generated by mixing between discharging hot and humid air and cold air outside. This causes various problems such as icing, traffic disturbances, and fire factors in the vicinity, moreover it can also damage the image of a company. Various methods can be used to prevent white plume, one of them is to install a heat exchanger at the outlet of the cooling tower so that the heat exchanger transfers as much heat as possible to lower the temperature. Therefore the air flow path in the cooling tower should be optimized. Installation of the filler can be used to make the air flow better, thus we investigate the effect of filler on the air flow using CFD method. The pressure and velocity profile in the cooling tower could be acquired by the calculations. The filler made the velocity of the air entering the heat exchanger uniform this was because high flow resistance of the filler suppresses the generation of eddy in the cooling tower. But the total air pressure drop increased about 2 times with filler because the pressure drop by the filler accounted for about 60% of the total pressure drop.

An Experimental Study on Performance Characteristic of 30RT Closed-Type Hybrid Cooling Tower using Bare Tube (베어관을 이용한 30RT급 하이브리드 밀폐형 냉각탑의 성능특성에 관한 실험적 연구)

  • Jun, Chul-Ho;Lee, Ho-Saeng;Moon, Choon-Geun;Kim, Jae-Dol;Yoon, Jung-In
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.06a
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    • pp.1096-1101
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    • 2005
  • In this study, the experiment of thermal performance about closed-type hybrid cooling tower was conducted. A closed type cooling tower is a device similar to a general cooling tower, but with cooling tower replaced by a heat exchanger. The test section for this experiment has the process that the cooling water flows from top part of heat exchanger to bottom side in the inner side of tube, and spray water flows gravitational direction in the outer side of it. Air contacts of tube outer side are counterflow. The heat transfer pipe used in this experiment is a bare type tube having an outside diameter of 15.88mm. In this experiment, heat performances of the cooling tower are calculated such as overall heat transfer coefficient of between the process fluid and air, cooing capacity and pressure drop.

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A Study on Hydraulic Behavior and Mass Transfer by Absorption in Packing Tower (충전탑에서 흡수에 따른 물질전달과 수력학적 거동에 관한 연구)

  • 김석택
    • Journal of Environmental Science International
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    • v.9 no.5
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    • pp.393-396
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    • 2000
  • Packing tower has been used in the chemical industry and the protection of environment for a long time. In the view of environmental protection purification of exhaust gas can be performance effective by gas absorption in counter-current packing tower. In this study characteristics of hydraulic and mass transfer were investigated in D. $0.3m {\times} H. 1.4m$ packing tower with 50mn plastic Hiflow-ring. This study was carried out "Test systems were experimented in conditions of Air, $Air/H_2O. NH_3-Air/H_2O, NH_3-Air/H_2O-H_2SO_4$ and $SO_2-Air/H_2O-NaOH$ under steady state" The extent of test included dry and wetting pressure drop physical law separation efficiency and hold-up as function of gas and liquid load.quid load.

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The Experimental Study of the Hybrid Cooling Tower using Cross and Counter Type Fills (직교.대향류 충진재를 이용한 하이브리드 냉각탑에 대한 실험적 연구)

  • Jun, C.H.;Lee, H.S.;Lee, H.C.;Moon, C.G.;Kim, J.D.;Kim, Eun-Pil;Yoon, J.I.
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2005.11a
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    • pp.236-237
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    • 2005
  • An experimental study on the Hybrid Cooling Tower has been done having a rated capacity of 3RT. Counter flow type fill, cross flow type fill and hybrid-type fill which is combined with two type fills as previously stated having a height of 0.3m have been used in the 0.8m${\times}$0.4m${\times}$1.9m dimensional tower respectively. The heat exchanger is consisting of 2 or 3 rows. The relevant temperatures and the velocities were selected based on the typical Korean weather for the year round operation of the tower. The cooling capacity of the tower is explained with respect to varying air inlet velocities, wet-bulb temperatures, and air to cooling water volume flow rate ratio (L/G ratio). The capacity of the hybrid-type fill was much superior to other fills, but hybrid-type fill shows higher pressure drop.

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Investigation of Drop Test Method for Simulation of Low Gravity Environment (저중력 환경 모사를 위한 낙하 시험 방법 연구)

  • Baek, Seungwhan;Yu, Isang;Shin, Jaehyun;Park, Kwangkun;Jung, Youngsuk;Cho, Kiejoo;Oh, Seunghyub
    • Journal of the Korean Society of Propulsion Engineers
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    • v.25 no.4
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    • pp.78-87
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    • 2021
  • Understanding the liquid propellant transport phenomena in low gravity is essential for developing Korea Space Launch Vehicle (KSLV) upper-stage for the diversity of space missions. A low-gravity environment can be simulated via the free-fall method on the ground; however, the air drag is inevitable. To reduce air resistance during free fall, air-drag shield is usually adopted. In this study, the free-fall method was performed with an air-drag shield from a 7-m height tower. The acceleration of a falling object was measured and analyzed. Low gravity below 0.01 g was achieved during 1.2-s free fall with the air-drag shield. The minimum gravitational acceleration value at 1.2-s after free fall was ±0.005 g, which is comparable to the value obtained from Bremen drop tower experiments, ±0.002 g. A prolonged free-fall duration may enhance the low-gravity quality during the drop tower experiments.

Program Development for Design of Counter-flow Cooling Tower (향류형 냉각탑의 기본설계 프로그램 개발)

  • Ko, Kwang-Ho;In, Jong-Soo;Oh, Tae-Il
    • Journal of the Korean Society of Industry Convergence
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    • v.7 no.4
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    • pp.383-389
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    • 2004
  • This paper is to develop the program for sizing of a counter-flow cooling tower. Air flow, air exit tmperature, fan power are calculated from design coditions of cooling tower by using this program. The basic equations and solutions of the heat transfer and pressure drop of cooling tower are descrived and the algorithm development for design of cooling tower is performed. The variation of fan power of cooling tower in acoording to variation of cell area and fill height is performed by using this program. This result shows that the optimal design for install and running cost of cooling tower can be performed by using this program.

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A Study on Hydraulic Behavior and Desorption of $CO_2$ Gas in the Counter-current Packing Tower (역류식 충전탑에서 이산화탄소 탈착과 수력학절 거동에 관한 연구)

  • 김석택
    • Journal of environmental and Sanitary engineering
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    • v.15 no.3
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    • pp.94-100
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    • 2000
  • This study was carried out to interpret hydraulic behavior and CO2 gas desorption in counter-current packing tower which packed 50mm plastic Hiflow-ring. The results are as follow : To compare with conventional packing, 50mm Hiflow-ring could save energy because of low pressure drop under high load. As relative error between calculated value and investigated value was less than 6% in the loading point and flooding point we found that we are predict results mathematically which occur in packing tower. The unique magnitude of packing which was used are as follows. $C_L=2.1{\times}10^{-4}$, n=0.787 so we can predict efficiency which occur

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A Hydraulic and Feasibility Study of New Tower Internal in Gas Processing Plants

  • Choo Chang-upp
    • International Journal of Safety
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    • v.3 no.1
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    • pp.15-19
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    • 2004
  • A new tower internal, which is called CSE, is presented. The CSE is composed of a nozzle perforated in its bottom along the entire periphery and equipped with a multi vane axial swirler at the inlet and hollow cylindrical separator at the outlet of the nozzle. According to the experimental work for obtaining the necessary hydraulic information of the CSE, which is used for preliminary design of a separation column, the CSE showed a stable operation over the wide rage of gas/liquid ratio. However, it caused large pressure drop due to the high gas velocity which should carry liquid droplets through the element. The high pressure drop may cause problems in energy recovery and the application of the CSE can be limited to the high pressure columns. Assuming that the tray efficiency of the CSE is the same with the existing separation columns, the results of the column design showed the size reduction of the column diameters by 30 to $40\%$ and investment cost saving, depending on operating conditions. The application of the CSE to separation column may also contribute to the de-bottlenecking the existing column.

A Study on the Mathematical Interpretation o Hydraulic Behaviour in Packing Tower (충전탑에서 수력학적 거동의 수학적 해석 연구)

  • 김석택
    • Journal of Korean Society for Atmospheric Environment
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    • v.17 no.1
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    • pp.51-56
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    • 2001
  • This study was carried out to interpret mathematically hydraulic behaviour in packing tower which packed 50 mm plastic Hiflow-ring with a dimension of 300 mm wide and 1,400 mm high. In view of energy saving, the recent packing. 50 mm plastic Higlow-ring was superior to conventional packings because of low pressure drop in high loads. As relative error between numerically predicted and experimentally obtained values was less then 6% in the loading and flooding point, it found that therir results appeared to be adequate. Comparison of hose two values in both dry and wet packing conditions. relative errors amount to 3.96 and 5.6%, respectively. In order to evaluate the operating characteristics of packing, the type, size, and material for packings must be estimated in various system and loads. This study is able to calculated pressure drop, hold-up, gas and liquid loads using mathematical interpretation. For these calculation, the specific constants of each packings must be calculated first all. The method of mathematical interpretation in this study turned out to be superior to the existing methods because of reduced errors at loading and flooding point.

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