Effects of Flow Rate of Cooling Water on Performance of Electrochemical Water Treatment for Cooling Tower of Water-Cooled Chiller

2021 ◽  
pp. 672-679
Author(s):  
Le Minh Nhut ◽  
Duong Huynh Minh Nhut ◽  
Nguyen Doan Anh Tai ◽  
Tran Trung Hao ◽  
Le Van Nguyen ◽  
...  
Keyword(s):  
Water Treatment ◽  
Flow Rate ◽  
Cooling Tower ◽  
Cooling Water ◽  
Rate Of Cooling

Efficient Replacement of Centrifugal With Absorption Chillers Upgrading the Heat Transfer of the Cooling Tower

2001 ◽  
Author(s):  
E. D. Rogdakis ◽  
V. D. Papaefthimiou
Keyword(s):  
Flow Rate ◽  
Cooling Tower ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Double Effect ◽  
Operating Conditions ◽  
Cooling Power ◽  
Absorption Chiller ◽  
Absorption Chillers ◽  
Cooling Water Flow Rate

Abstract It is a general trend today, the old centrifugal machines to be replaced by new absorption machines. The mass flow rate of the cooling water in the centrifugal machines is normally 30% less than that in the two-stage absorption chiller for the same refrigerating capacity. Some absorption chillers manufacturers have updated and improved the double-effect technology increasing the cooling water temperature difference from the typical value of 5.5°C to 7.4°C and reducing the cooling water flow rate by about 30%. Using such a modern double effect absorption unit to replace a centrifugal chiller the same cooling water circuit can be used and the total cost of the retrofit is minimized. In this case a new flow pattern of the cooling tower is developed, and in this paper the design of a new tower fill is predicted taking into account the new factors characterizing the operating conditions and the required performance of the tower. As an example, the operational curves of a modified cooling tower (1500 KW cooling power) used by a 240 RT double-effect absorption chiller are presented.

Experimental Research on the Effect of Cross-Wind to Wet-Cooling Tower Performance

2013 ◽  
Vol 860-863 ◽  
pp. 1412-1415
Author(s):  
Qing Yang Wang ◽  
Tian Yu Sun ◽  
Jian Zhang ◽  
Jian Xing Ren
Keyword(s):  
Wind Velocity ◽  
Flow Rate ◽  
Temperature Difference ◽  
Cooling Tower ◽  
Thermal Power ◽  
Water System ◽  
Cooling Water ◽  
Cooling Capacity ◽  
Inlet Temperature ◽  
Circulating Water

Environmental cross-wind has a influence on cooling capacity of wet cooling tower to a great extent in power plant.The variation of circulating-water temperature difference (Δt) and cooling coefficient of efficiency(η) with cross-wind velocity, circulating water inlet temperature and flow rate, are shown under cross-wind conditions, compared with cases without wind. By using experimental platform of cooling water system based on 300MW thermal power unit,it is found that with cross-wind velocity increasing,cooling temperature difference and cooling efficiency decrease first then increase at the knee point when the velocity value is 0.8m/s. In addition, the correlation betweenΔt ,η and parameters,such as circulating-water inlet temperature and flow rate, is derived for cases with windless conditions.

Characteristic Analysis of Francis-Turbine in Cooling Tower

2012 ◽  
Vol 190-191 ◽  
pp. 57-59 ◽  
Author(s):  
Lan Jin Zhang ◽  
Lei Wang ◽  
Yan Ren
Keyword(s):  
Flow Rate ◽  
Cooling Tower ◽  
Water System ◽  
Cooling Water ◽  
Hydraulic Performance ◽  
Francis Turbine ◽  
Characteristic Analysis ◽  
Flow Passage ◽  
Water Power ◽  
Water Turbine

The water turbine stands in the cooling water system and drives the fan in the cooling tower, so its flow rate, head and output is limited to the flow rate of cooling water, saved-energy of pump and input of fan separately. The spiral casing dimension of water turbine is limited to the diameter of tower. All above facts make the water turbine of cooling tower be different to that of water power station. The paper introduces one turbine which flow rate is 0.139m/s. Its characteristic of flow passage and hydraulic performance is analyzed, and some new flow passage to improve hydraulic performance is suggested.

Research on Influence Factors of Cooling Tower Performance

2011 ◽  
Vol 280 ◽  
pp. 119-123 ◽  
Author(s):  
Meng Lei Wang ◽  
Zhe Tian ◽  
Kui Xing Liu
Keyword(s):  
Flow Rate ◽  
Air Conditioning ◽  
Heat Dissipation ◽  
Cooling Tower ◽  
Influence Factors ◽  
Cooling Water ◽  
Cooling Capacity ◽  
Air Conditioning System ◽  
Energy Efficiency Improvement ◽  
Water Ratio

The cooling tower is often overlooked in the air conditioning system, but it impacts on the heat dissipation of system. This paper tests and researches the influence factors of cooling tower performance. First, we analyzed the cooling tower efficiency, cooling capacity and others of an actual air conditioning system. Then we studied the relationship between air/water ratio, inlet air quality and flow rate and the cooling tower performance. The results show that the air/water ratio have a linear relationship with the cooling tower efficiency, and the quality and the flow rate of inlet air have a greater impact on the cooling capacity and cooling water contrast method. This paper has an certain significance on the diagnosis and energy efficiency improvement of cooling towers.

Experimental Research on Heat Transfer of Closed Cooling Tower with Packing

2014 ◽  
Vol 960-961 ◽  
pp. 614-620 ◽  
Author(s):  
Ya Su Zhou ◽  
Xiao Ding ◽  
Wei Xie
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Cooling Tower ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Cocurrent Flow ◽  
Inlet Temperature ◽  
Cooling Performance ◽  
Cooling Water Flow Rate ◽  
Better Than

Three different structural types of closed cooling tower (CCT) and two cooling water flow directions were considered. The experimental study were done on the cooling performance of influences of inlet air dry and wet bulb temperature, cooling water flow rate and inlet temperature, air flow rate and spray density. The experimental results show that the cooling performance of CCT with packing is obviously better than non-packing cooling tower in 7%~18.4%. And the cooling performance of CCT with packing on top and coil underneath is slightly better than CCT with coil on top and packing underneath in 4.9%. In the same conditions the cooling performance of CCT with packing under cooling water cocurrent-flow is better than that cooling water countercurrent-flow in 3.2%~9.6%. Therefore, the closed cooling tower structure with the cooling water path in bottom and out top, and with packing on top and coil underneath is recommended.

scholarly journals Effects of Pulse Frequency on Performance of Electrochemical Cooling Water Treatment for Cooling Tower of Water-Cooled Chiller

2021 ◽  
Vol 19 ◽  
pp. 619-623
Author(s):  
Le Minh Nhut ◽  
◽  
Duong Huynh Minh Nhut ◽  
Keyword(s):  
Water Treatment ◽  
Current Density ◽  
Duty Cycle ◽  
Cooling Tower ◽  
Cooling Water ◽  
Operation Time ◽  
Pulse Frequency ◽  
Coefficient Of Performance ◽  
Total Hardness ◽  
Operational Parameters

Due to the rapid economic development in recent years, water-chiller is being used more and more in hotels, restaurants, resorts, and industrial zones in Vietnam. The cooling tower’s cooling water quality is an important factor in determining the effect on electrical consumption and the coefficient of performance of a water-cooled chiller. Therefore, it is necessary to maintain the quality of cooling water during the operation time of the water-cooled chiller. The aim of this work is to investigate the effects of the pulse frequency and operational parameters such as current density, pulse duty cycle, and energy consumption on the performance of removing hardness ion of electrochemical cooling water treatment for the cooling tower of the water-cooled chiller. The results show that the highest efficiency of the total hardness removal corresponding to a pulse frequency of 1 kHz, a pulse duty cycle of 0.7, and a current density of 80A/m2.

Hydraulic model of a water cooling system in a chemical plant

1988 ◽  
Vol 53 (4) ◽  
pp. 788-806
Author(s):  
Miloslav Hošťálek ◽  
Jiří Výborný ◽  
František Madron
Keyword(s):  
Flow Rate ◽  
Cooling System ◽  
Cooling Water ◽  
Graph Algorithm ◽  
Automatic Generation ◽  
Hydraulic Calculation ◽  
Return Flow ◽  
Flow Rates ◽  
Pressure Losses ◽  
Controlled Flow

Steady state hydraulic calculation has been described of an extensive pipeline network based on a new graph algorithm for setting up and decomposition of balance equations of the model. The parameters of the model are characteristics of individual sections of the network (pumps, pipes, and heat exchangers with armatures). In case of sections with controlled flow rate (variable characteristic), or sections with measured flow rate, the flow rates are direct inputs. The interactions of the network with the surroundings are accounted for by appropriate sources and sinks of individual nodes. The result of the calculation is the knowledge of all flow rates and pressure losses in the network. Automatic generation of the model equations utilizes an efficient (vector) fixing of the network topology and predominantly logical, not numerical operations based on the graph theory. The calculation proper utilizes a modification of the model by the method of linearization of characteristics, while the properties of the modified set of equations permit further decrease of the requirements on the computer. The described approach is suitable for the solution of practical problems even on lower category personal computers. The calculations are illustrated on an example of a simple network with uncontrolled and controlled flow rates of cooling water while one of the sections of the network is also a gravitational return flow of the cooling water.

Recent state-of-the-art of biodegradable scale inhibitors for cooling-water treatment applications (Review)

2016 ◽  
Vol 63 (2) ◽  
pp. 122-129 ◽  
Author(s):  
K. I. Popov ◽  
N. E. Kovaleva ◽  
G. Ya. Rudakova ◽  
S. P. Kombarova ◽  
V. E. Larchenko
Keyword(s):  
Water Treatment ◽  
State Of The Art ◽  
Cooling Water
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