Đánh giá ảnh hưởng của mật độ dòng điện đến hiệu quả xử lý nước làm mát bình ngưng của hệ thống điều hòa không khí trung tâm Water-Cooled Chiller bằng phương pháp điện phân

Le Minh Nhut; Duong Huynh Minh Nhut

doi:10.54644/jte.63.2021.73

Authors

Le Minh Nhut HCMC University of Technology and Education, Vietnam
Duong Huynh Minh Nhut College of Technology II, Vietnam

Corressponding author's email:

nhutlm@hcmute.edu.vn

DOI:

https://doi.org/10.54644/jte.63.2021.73

Keywords:

water treatment, electrochemical, cooling tower, condenser, current density

Abstract

The paper presents the results of evaluating the effect of current density on the efficiency of cooling water treatment of condenser of cooling towers in water-cooled chiller system by the electrolysis method. The cooling water of the condenser always contains metal ions Ca2+ and Mg2+ (hard water), which is the cause of the scale formation on the inner surface of tubes of the condenser leads to reduce the efficiency of heat exchange and coefficient of performance(COP) of the water-cooled chiller system. Therefore, it is necessary to treat this cooling water to reduce these metal ions to obtain the required water quality during operation time to increase the heat transfer efficiency of the condenser and improving the system’s COP. In this study, an electrochemical cooling water treatment system was designed and installed on the campus of Ho Chi Minh City University of Technology and Education for experiments. The results revealed that the highest efficiency value of the total harness removal is 95% corresponding to the current density value of 80 A/m2. Besides, the effect of current density on the TDS index and pH index also analyzed.

Downloads: 0

Download data is not yet available.

References

Colin Frayne, Cooling water treatment Principles and Practice, Chemical Publishing Co., Inc, New York, pp.30-31, 1999.

Herbert W. Stanford III, HVAC Water Chillers and Cooling Towers - Fundamentals, Application, and Operation, Second Ed, Taylor & Francis Group, LLC, pp.205-206, 2012.

R. Rungvavmanee and C. Phalakornkule, Reduction of Langelier index of cooling water by electrolytic treatment with stainless steel electrode, Water SA, Vol. 38 No. 5, 2012. DOI: https://doi.org/10.4314/wsa.v38i5.24

C. Gabriellia, G. Maurina, H. Francy-Chaussonb,P. Theryb, T. T. M. Tran and M. Tlili, Electrochemical water softening: principle and application, Desalination, 201, pp.150–163, 2006. DOI: https://doi.org/10.1016/j.desal.2006.02.012

H.I. Abdel-Shafy, M.A. Shoeib and M.A. El-Khateeb, Electrochemical treatment of industrial cooling tower blowdown water using magnesium-rod electrode, Water resources and Industry, 23, pp.100121, 2020. DOI: https://doi.org/10.1016/j.wri.2019.100121

Zhihao Lu, Jiali Tang, María de Lourdes Mendoza, Dingming Chang, Lankun Cai and Lehua Zhang, Electrochemical decrease of sulfide in sewage by pulsed power supply, Journal of Electroanalytical Chemistry, 745, pp.37–43, 2015. DOI: https://doi.org/10.1016/j.jelechem.2015.02.014

Y. Guo, Z. Xu, S. Guo, S. Chen, H. Xu, X. Xu, X. Gao and W. Yan, Selection of anode materials and optimization of operating parameters for electrochemical water descaling, Separation and Purification Technology, 745, pp. 118-304, 2021. DOI: https://doi.org/10.1016/j.seppur.2021.118304

X. Hao, X. Zhicheng, G. Yìei, G. Siyuan, X. Xing, G. Xian, W. Liangtian and Y. Wei, Research and application progress of electrochemical water quality stabilization technology for recirculating cooling water in China: A short review, Journal of Water Process Engineering, 37, pp. 101-433, 2020. DOI: https://doi.org/10.1016/j.jwpe.2020.101433

M. Geng, S. Zhong, G. Wang, P. Cui and D. Chen, Research on the influence of circulating cooling water on electrochemical scale inhibition, IOP Conf. Ser.: Earth Environ. Sci. 052021, 514, 2020. DOI: https://doi.org/10.1088/1755-1315/514/5/052021

Y. Lei, M. Saakes, R. D. V. D. Weijden and C. J. N. Buisman, Effects of current density, bicarbonate and humic acid on electrochemical induced calcium phosphate precipitation, Chemical Engineering Journal, 342, pp. 350-356, 2018. DOI: https://doi.org/10.1016/j.cej.2018.02.104

D. Hasson, V. Lumelsky, G. Greenberg, Y. Pinhas and R. Semiat, Development of the electrochemical scale removal technique for desalination applications, Desalination, 230, pp.329–342, 2008. DOI: https://doi.org/10.1016/j.desal.2008.01.004

O. Devos, C. Gabrielli, M. Tlili and Tribollet, Nucleation-Growth Process of Scale Electrodeposition: Influence of Supersaturation, Journal of the Electrochemical Society, 150 (7) C494-C501, 2008. DOI: https://doi.org/10.1149/1.1580825

A. H. Becker, J. J. Cohen and A. D. Zdunek, Electrochemical Cooling Water Treatment: A New Strategy for Control of Hardness, Scale, Sludge and Reducing Water Usage. ASHRAE, Vol. 115, Part 1, 2009.

H. Jin, Y. Yu, L. Zhang, R. Yan and X. Chen, Polarity reversal electrochemical process for water softening, Separation and Purification Technology, 2018. DOI: https://doi.org/10.1016/j.seppur.2018.09.009

J. Wang, J. Yao, L. Wang, Q. Xue, Z. Hu and B. Pan, Multivariate optimization of the pulse electrochemical oxidation for treating recalcitrant dye wastewater, Separation and Purification Technology, 230, 115851, 2020. DOI: https://doi.org/10.1016/j.seppur.2019.115851

J. Wei, X. Zhu and J. Ni. Electrochemical oxidation of phenol at boron-doped diamond electrode in pulse current mode. Electrochimica Acta, 56, pp. 5310–5315, 2011. DOI: https://doi.org/10.1016/j.electacta.2011.04.006

L. Jiania, X. Zhichenga, X. Haoa, Q. Dana, L. Zhengweib, Y. Weia and W. Yu, Pulsed electrochemical oxidation of acid Red G and crystal violet by PbO2 Anode. Journal of Environmental Chemical Engineering, 8, 103773, 2020. DOI: https://doi.org/10.1016/j.jece.2020.103773

R. Rungvavmanee, K. Sayjun, K. Berpant and C. Phalakornkule, Electrolytic treatment with aluminum anodes for reuse of cooling tower water, TIChE International Conference 2011, paper code: cr028, 2011.

N. D. Mu’azu, M. Al-Yahya and A. M. Al-Haj-Ali. Specific energy consumption reduction during pulsed electrochemical oxidation of phenol using graphite electrodes. Journal of Environmental Chemical Engineering, 4, pp. 2477-2486, 2016. DOI: https://doi.org/10.1016/j.jece.2016.04.026

Tiêu chuẩn xây dựng Việt Nam TCXD 232:1999 về hệ thống thông gió, điều hòa không khí và cấp lạnh - Chế tạo lắp đặt và nghiệm thu.

Meijie Ren, Yonghui Song, Shuhu Xiao, Ping Zeng, Jianfeng Peng. Treatment of berberine hydrochloride wastewater by using pulse electro-coagulation process with Fe electrode. Chemical Engineering Journal, 169, pp. 84–90, 2011. DOI: https://doi.org/10.1016/j.cej.2011.02.056