مجله آب و فاضلاب

مجله آب و فاضلاب

به‌کارگیری سیستم سرمایش هوای دینامیکی به‌منظور کاهش مصرف آب کولرهای آبی تبخیری تولیدی ایران

مقالات آماده انتشار

نوع مقاله : یاداشت‌ فنی

نویسنده
بهزاد امیدی‌کاشانی
استادیار، گروه مهندسی مکانیک، دانشکده مهندسی، دانشگاه بیرجند، خراسان جنوبی، ایران
10.22093/wwj.2025.499350.3459
چکیده
مصرف آب قابل‌ملاحظه کولرهای آبی تبخیری تولیدی ایران با توجه به کم‌آبی و کاهش منابع آب در کشور ایران بر همگان واضح است. از آنجایی که کولرهای آبی تبخیری تولیدی ایران طرح قدیمی داشته و از طرفی با شرایط اتمسفریک ایران که عمدتاً گرم و نیمه‌خشک است، تطابق خوبی داشته ولی از طرف دیگر با توجه به مصرف بالای آب در این کولرها و کمبود منابع آبی، خصوصاً در ایام تابستان، نیاز به انجام پژوهش‌های علمی بیشتر و به‌کارگیری ایده‌ها و تکنیک‌های جدید برای کاهش مصرف آب در این وسایل احساس می‌شود. در این پژوهش ابتدا سیستم جدید سرمایش دینامیکی هوا معرفی شد که توسط آن هوای اتمسفر را می‌توان بدون استفاده از سیستم‌های تبرید متداول امروزی تا دمای oC90- سرد کرد. سیستم سرمایش دینامیکی هوا یک روش کاملاً نوین و با نوآوری جدید در سطح جهانی است که بر پایه اصول علمی دینامیک گاز و ترمودینامیک قادر است در چند مرحله، سرعت هوای عبوری از این سیستم را به مقدار بالای صوت رسانده و بالطبع دمای هوای عبوری از سیستم یا انرژی محسوس آن را به‌نحو چشمگیری کاهش دهد. این سیستم ابتکاری در حال حاضر در سردخانه‌های صنعتی کاربری تجاری دارد. در این پژوهش با به‌کارگیری هوای سرد حاصل از این سیستم، دمای آب سیرکولاسیون در کولرهای آبی تبخیری کاهش چشمگیر یافت و بالطبع میزان مصرف آب در کولرهای آبی تبخیری کاهش یافت. همچنین نشان داده شد که با به‌کارگیری هوای سرد تولیدی از سیستم سرمایش دینامیکی، دمای آب سیرکولاسیون از دمای تر محیط هوا تا دمای oC 4 کاهش می‌یابد و در این شرایط بار سرمایشی و نسبت فصلی بازده انرژی به ترتیب 97 و 2/29 درصد افزایش و نرخ مصرف آب و مصرف ویژه آب به ترتیب 2/35 و 5/67 درصد کاهش می‌یابند. بنابراین با به‌کارگیری این سیستم در کولرهای آبی تبخیری تولیدی ایران، نرخ‌های مصرف آب و انرژی هم‌زمان به‌نحو چشمگیری کاهش می‌یابند.
کلیدواژه‌ها
کولر تبخیر آبی
سرمایش دینامیکی
کاهش مصرف آب
افزایش بازده

عنوان مقاله English

Applying Dynamic Air Cooling System to Reduce Water Consumption of Iranian-Made Evaporative Coolers

نویسنده English

Behzad Omidi Kashani
Assist. Prof. of Mechanical Engineering, Dept. of Mechanical Engineering, Faculty of Engineering, University of Birjand, South Khorasan, Iran
چکیده English

The considerable water consumption of Iranian-produced evaporative coolers is obvious to everyone due to the water shortage and the reduction of water resources in Iran. Since Iranian-produced evaporative coolers have an old design and, on the one hand, are well adapted to the atmospheric conditions of Iran, which are mainly hot and semi-arid, but on the other hand, due to the high water consumption in these coolers and the lack of water resources, especially in summer, there is a need to conduct more scientific research and use new ideas and techniques to reduce water consumption in these devices. In this study, a new dynamic air cooling system is first introduced, by which atmospheric air can be cooled to -90oC without using today's conventional refrigeration systems. The dynamic air cooling system is a completely new and innovative method at the global level, which, based on the scientific principles of gas dynamics and thermodynamics, is able to increase the speed of air passing through this system to supersonic values in several stages and, consequently, significantly reduce the temperature of the air passing through the system or its sensible energy. This innovative system is currently being used commercially in industrial cold stores. In the current work, by using the cold air produced by this system, the temperature of the circulating water in evaporative water coolers is significantly reduced, and consequently, the amount of water consumption in evaporative water coolers is reduced. In the current work, it is shown that by using the cold air produced by the dynamic cooling system, the temperature of the circulating water is reduced from the wet bulb temperature of the ambient air to a temperature of 4 oC and in these conditions, the cooling load and the seasonal energy efficiency ratio increase by 97 and 29.2%, respectively, and the water consumption rate and specific water consumption decrease by 35.2 and 67.5%, respectively. Therefore, by using this system in evaporative water coolers produced in Iran, the water and energy consumption rates are both significantly reduced.

کلیدواژه‌ها English

Evaporative Water Cooler
Dynamic Air Cooling
Water Consumption Reduction
Efficiency Increase
Temperature of Water Circulation
Al-Badri, A. R. and Al-Waaly, A. A. Y., 2017. The influence of chilled water on the performance of direct evaporative cooling. Energy and Buildings, 155, 143-150. https://doi.org/10.1016/j.enbuild.2017.09.021.
Alsaghir, A. M., Hamdan, M. O. and Orhan, M. F., 2021. Evaluating velocity and temperature fields for Ranque–Hilsch vortex tube using numerical simulation. International Journal of Thermofluids, 10, 100074. https://doi.org/10.1016/j.ijft.2021.100074.
ASHRAE, 2015. Method of Testing Direct Evaporative Air Coolers. Supersedes ANSI/ASHRAE Standard 133-2008. ISSN: 10412336. US: ASHRAE. [Link]
Don, W. G. and Robert, H. P., 2008. Perry's Chemical Engineers' Handbook, Eighth Edition, New York, McGraw-Hill Education.
Facciolo, L., 2006. A study on axially rotating pipe and swirling jet flows (Doctoral dissertation, KTH). [Link]
He, S., Guan, Z., Gurgenci, H., Jahn, I., Lu, Y. and Alkhedhair, A. M., 2014. Influence of ambient conditions and water flow on the performance of pre-cooled natural draft dry cooling towers. Applied Thermal Engineering, 66, 621-631. https://doi.org/10.1016/j.applthermaleng.2014.02.070.
Hu, Z., Wang, D., Gao, F., Cao, Y. and Wu, H., 2023. Experimental investigation on cooling performance of vortex tube with rectifier using Taguchi method. Case Studies in Thermal Engineering, 49, 103373. https://doi.org/10.1016/j.csite.2023.103373.
Huang, L. and El-Genk, M. S., 1998. Heat transfer and flow visualization experiments of swirling, multi-channel and conventional impinging jets. International Journal of Heat and Mass Transfer, 41, 583-600. https://doi.org/10.1016/S0017-9310(97)00123-3.
Hussain, I., Bibi, F., Bhat, S. A., Sajjad, U., Sultan, M., Ali, H. M. et al., 2022. Evaluating the parameters affecting the direct and indirect evaporative cooling systems. Engineering Analysis with Boundary Elements, 145, 211-223. https://doi.org/10.1016/j.enganabound.2022.09.016.
Nozaki, A., Igarashi, Y. and Hishida, K., 2003. Heat transfer mechanism of a swirling impinging jet in a stagnation region. Heat Transfer-Asian Research, 32, 663-673. https://doi.org/10.1002/htj.10120.
Omidi Kashani, B. and Deymi, O., 2021. Investigating the correct operation of domestic water meters in the range of water consumption of evaporative coolers according to the different atmospheric conditions  for four cities of South Khorasan Province. Journal of Water and Wastewater, 32(3), 40-54. (In Perian) https://doi.org/10.22093/wwj.2020.250004.3067.
Omidi Kashani, B., 2015. The process of optimizing water evaporative coolers by adjusting the volume rate of circulating water. Iran patent application. (In Persian)
Omidi Kashani, B., 2017. The need for economical water efficiency labels on appliances such as water coolers and practical solutions to enhance the efficiency label. Iran Water and Wastewater Science Engineering Congress. Tehran: Iranian Water and Wastewater Association. (In Persian). [Link]
Omidi Kashani, B., 2022. Increase of energy efficiency ratio of a direct evaporative cooler by dynamic behavior with energy and exergy analysis. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 236, 3818-3830. https://doi.org/10.1177/09544062211042051.
Rathakrishnan, E., 2019. Applied Gas Dynamics, John Wiley & Sons Ltd. 2nd Edition, Indian Institute of Technology Kanpur, India. [Link]
Razumtseva, O., Razumtsev, O. and Panasjuk, P., 2023. A refrigeration unit with dynamic air cooling and a working element of the unit. United States patent application 17/759,848. Publication of US20230129766A1. [Link]
Sellam, S. H., Moummi, A., Mehdid, C. E., Rouag, A., Benmachiche, A. H., Melhegueg, M. A. et al., 2022. Experimental performance evaluation of date palm fibers for a direct evaporative cooler operating in hot and arid climate. Case Studies in Thermal Engineering, 35, 102119. https://doi.org/10.1016/j.csite.2022.102119.
Teng, S. and Xi, H., 2022. Experimental evaluation of vortex tube and its application in a novel trigenerative compressed air energy storage system. Energy Conversion and Management, 268, 115972. https://doi.org/10.1016/j.enconman.2022.115972.
Wongcharee, K., Kunnarak, K., Chuwattanakul, V. and Eiamsa-Ard, S., 2020. Heat transfer rate of swirling impinging jets issuing from a twisted tetra-lobed nozzle. Case Studies in Thermal Engineering, 22, 100780. https://doi.org/10.1016/j.csite.2020.100780.
Xu, L., Yang, T., Sun, Y., Xi, L., Gao, J., Li, Y. et al., 2021. Flow and heat transfer characteristics of a swirling impinging jet issuing from a threaded nozzle. Case Studies in Thermal Engineering, 25, 100970. https://doi.org/10.1016/j.csite.2021.100970.
Zucker, R. D. and Biblarz, O., 2019. Fundamentals of Gas Dynamics, John Wiley & Sons, Inc. 3rd Edition. [Link]
مجله آب و فاضلاب

مقالات آماده انتشار، پذیرفته شده
انتشار آنلاین از 28 مهر 1404