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بررسی تجربی تاثیر موانع در افزایش راندمان حرارتی آبگرمکن مخزندار گازسوز | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 18، دوره 53، شماره 3 (Special Issue)، خرداد 1400، صفحه 2013-2030 اصل مقاله (1.9 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2020.17232.6542 | ||
| نویسندگان | ||
| شهرام کاشانی اصل1؛ محمدتقی شروانی تبار* 2؛ مرتضی یاری3؛ سیما باهری اسلامی4 | ||
| 1گروه مهندسی مکانیک، دانشکده فنی مهندسی مکانیک، دانشگاه تبریز، تبریز، ایران. | ||
| 2تبریز*مهندسی مکانیک | ||
| 3دانشگاه تبریز، دانشکده مهندسی مکانیک | ||
| 4دانشیار/دانشگاه تبریز، دانشکده مهندسی مکانیک | ||
| چکیده | ||
| این تحقیق، افزایش راندمان حرارتی آبگرمکن مخزندار گازسوز را به صورت تجربی بررسی می‌کند. برای این کار، از شش مانع جهت کاهش سرعت حرکت گازهای خروجی احتراق در تنوره آبگرمکن استفاده شد. با قراردادن 6 مانع در داخل تنوره، از خروج سریع گازهای حاصل از احتراق جلوگیری به عمل آمد.3 مانع از نظر هندسه و ابعاد تقریبا مانند هم و 3 مانع از نظر هندسه و ابعاد متفاوت هستند. همچنین، فاصله بین موانع یکسان در نظر گرفته شد. هندسه و ابعاد موانع از روی بررسی‌های تجربی انتخاب شدند. نتایج تجربی نشان دادند که در صورت استفاده از هندسه، ابعاد و ترتیب بهینه برای موانع، راندمان حرارتی تا 5/82 درصد افزایش می‌یابد. همچنین، نتایج اندازه‌گیری تحلیل‌گر گاز در آزمایشگاه، نشان داد که با بهبود راندمان حرارتی، گازهای آلاینده در خروجی دودکش نیز تقریبا در کمترین مقدار ممکن قرار داشتند. در نهایت، با درنظرگرفتن کمیت‌های تاثیرگذار بر روی عدم قطعیت راندمان حرارتی، با لحاظ سطح اطمینانی تقریباً برابر 95 درصد، عدم قطعیت کل برای راندمان حرارتی مدل بهینه نهایی عدد 17/0± محاسبه گردید. | ||
| کلیدواژه‌ها | ||
| آبگرمکن مخزندار گازسوز؛ مانع؛ راندمان حرارتی؛ آزمون تجربی | ||
| عنوان مقاله [English] | ||
| Experimental study on the enhancement of the thermal efficiency of a household gas water heater | ||
| نویسندگان [English] | ||
| Shahram Kashaniasl1؛ Mohammad Taghi Shervani Tabar2؛ Mortaza Yari3؛ Sima Baheri Islami4 | ||
| 1Department of Mechanical Engineering, University of Tabriz, Iran. | ||
| 3Department of Mechanical Engineering, University of Tabriz | ||
| 4Associate Professor/ Department of Mechanical Engineering, University of Tabriz | ||
| چکیده [English] | ||
| In this paper improvement of efficiency of a household gas water heater has been investigated experimentally. For this purpose, six baffles have been used for the deceleration of the hot exhaust gases in the middle tube of the water heater. Three of the baffles have almost the same geometry and dimension and the other three are different from geometry and dimension points of view. Also, the same distances between the baffles have been considered. The geometry and dimension of the baffles have been chosen by experimental tests. Experimental results show that by employing the optimum geometries and dimensions of the baffles and by selecting the optimum arrangement of the baffles, the thermal efficiency of the household gas water heater has been improved and increased up to 82.5%. Experimental results also show that by the improvement of the thermal efficiency of the household gas water heater, pollutant emissions which have been measured by the gas analyzers at the laboratory remained almost at the lowest level. Finally, by taking into account the effective parameters on the uncertainty for the thermal efficiency, in terms of the level of almost 95% for insurance against the reported number for the efficiency, the total uncertainty of the final optimized model for the thermal efficiency is ± 0.17. | ||
| کلیدواژه‌ها [English] | ||
| Household gas water heater, Baffle, Thermal efficiency, Experimental test | ||
| مراجع | ||
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[1] The Office of the national building regulations and to promote the compilation Ministry of housing and urban development department and the way, in: the building Iran's Tose of the publication, 2008. [2] M.M. Sedeh, J. Khodadadi, Energy efficiency improvement and fuel savings in water heaters using baffles, Applied energy, 102 (2013) 520-533. [3] K. Moharamkhani, M. Tavakoli, F. samvad, Quantitative and qualitative comparison on the exhaust gas between a gas water heater with an adjustment warhead and a gas water heater without warhead, in: 15th Fluid Dynamics Conference, Hormozgan university, 2013. [4] M.Bidabadi, M. Sedigi, M.Shirazi, An investigation on the effect of parameters of burner on performance the gas heater, in: The second Conference of combustion of Iran's Islamic Azad University of Mashhad, 2007. [5] Q.Karami, H.Heravi, M. Nabavi, S.Javadi, Simulation of a household gas water heater and an investigation on the effect of the adjustment warhead and ᴠ / ᴧ baffles on the heat transfer rate in the middle tube, in: The second Conference of combustion of Iran's Islamic Azad University of Mashhad, 2008. [6] S.Hossein-pour, Sh.Kashaniasl, Numerical and experimental investigation on the effect of baffles on increasing thermal efficiency of a gas heater, Journal of scientific-research and fuel combustion. , in, 2010. [7] Sh.Kashaniasl, Improvement of thermal efficiency of a gas heater by comparison results of simulation of exhaust gases and experimental results, Mechanical energy conversion field, Islamic Azad University, Tabriz, 2008. [8] I. Sezai, L. Aldabbagh, U. Atikol, H. Hacisevki, Performance improvement by using dual heaters in a storage-type domestic electric water-heater, Applied Energy, 81(3) (2005) 291-305. [9] Hegazy, A. A, Effect of inlet design on the performance of storage-type domestic electrical water heaters, Applied Energy, 84(12) (2007) 1338-1355. [10] A.Golneshan, A.Motagi, A numerical investigation on the heat transfer in the new designed gas water heater, in, The second International Conference on optimization of fuel consumption in buildings, fuel optimization organization, Tehran, Iran, 2002. [11] M.Bidabadi, Partners, Optimizing a gas water heater, in, The second International Conference on optimization of fuel consumption in the building, Tehran, Interior fuel optimization, 2002. [12] A.Rahimi, Effective parameters on the thermal efficiency of gas water heater and its economical analysis, in, The Fourth International Conference on new approaches in maintenance energy, 2014. [13] S. Jaisankar, T. Radhakrishnan, K. Sheeba, Studies on heat transfer and friction factor characteristics of thermosyphon solar water heating system with helical twisted tapes, Energy, 34(9) (2009) 1054-1064. [14] S. Jaisankar, T. Radhakrishnan, K. Sheeba, Experimental studies on heat transfer and friction factor characteristics of thermosyphon solar water heater system fitted with spacer at the trailing edge of twisted tapes, Applied Thermal Engineering, 29(5-6) (2009) 1224-1231. [15] S.Amini, An investigation of heat transfer enhancing of gas water heater by using a disk shape barrier in the middle tube, Isfahan University of technology, 2002. [16] S. Choudhury, V.G. McDonell, S. Samuelsen, Combustion performance of low-NOx and conventional storage water heaters operated on hydrogen enriched natural gas, International Journal of Hydrogen Energy, (2019). [17] Z. Liu, K. Xu, L. Qi, H. Pan, Z. Zhang, Y. Pan, Y. Yuan, Y. Zeng, A High Efficiency Electric Heater Based on Dual-helical Tube and Screw-tape for Instant Water Heating, Applied Thermal Engineering, (2019) 114018. [18] R. Amini, M. Amini, A. Jafarinia, M. Kashfi, Numerical investigation on effects of using segmented and helical tube fins on thermal performance and efficiency of a shell and tube heat exchanger, Applied Thermal Engineering, 138 (2018) 750-760. [19] E. Nshimyumuremyi, W. Junqi, Thermal efficiency and cost analysis of solar water heater made in Rwanda, Energy Exploration & Exploitation, 37(3) (2019) 1147-1161. [20] S. Kashaniasl, The household gas water heaters, Publishing Amidi, in, Publishing Amidi, 2013. [21] The National Iranian standard organization, national standard number 1219-2 , Gas water heater with chimney properties and test methods and Energy label instructions, in, 2004. [22] K.Amiraslani, Fuel and combustion lecture notes, in, Islamic Azad University of Tehran-South, 2014. [23] American National Standard/CSA standard for gas water heaters ,4th ed,, in, 2009. [24] Y. Kamla, M. Bouzit, H. Ameur, M.I. Arab, A. Hadjeb, Effect of the inclination of baffles on the power consumption and fluid flows in a vessel stirred by a Rushton turbine, Chinese Journal of Mechanical Engineering, 30(4) (2017) 1008-1016. [25] M. shervanitabar, Sh.Kashanias, S. baheri, M. yari, Numerical investigation of the increase of thermal efficiency of gas tank water heater and validation of its results with experimental results, Amirkabir Journal of Mechanical Engineering, (2019). [26] R.J. Moffat, Describing the uncertainties in experimental results, Experimental thermal and fluid science, 1(1) (1988) 3-17.
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