پیوندهای مفید
آمار
| تعداد نشریات | 21 |
| تعداد شماره‌ها | 583 |
| تعداد مقالات | 8,685 |
| تعداد مشاهده مقاله | 66,514,291 |
| تعداد دریافت فایل اصل مقاله | 7,051,193 |
ارزیابی عددی آسایش حرارتی و کیفیت هوا در یک فضای اداری مجهز به سیستم سرمایش تابشی سقفی و سامانه تلفیقی تابشی و جابجایی | ||
| مدل سازی در مهندسی | ||
| دوره 22، شماره 77، شهریور 1403، صفحه 37-56 اصل مقاله (1.86 M) | ||
| نوع مقاله: مقاله مکانیک | ||
| شناسه دیجیتال (DOI): 10.22075/jme.2023.31022.2478 | ||
| نویسندگان | ||
| محمد امینی1؛ عسگر مینایی* 2؛ نگین معلمی خیاوی3 | ||
| 1کارشناسی ارشد، گروه مهندسی مکانیک، دانشگاه محقق اردبیلی | ||
| 2دانشیار، گروه مهندسی مکانیک، دانشگاه محقق اردبیلی، اردبیل، ایران | ||
| 3دانش‌آموخته دکتری، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس | ||
| تاریخ دریافت: 01 تیر 1402، تاریخ بازنگری: 21 آبان 1402، تاریخ پذیرش: 12 آذر 1402 | ||
| چکیده | ||
| در این تحقیق عملکرد سیستم سرمایش تابشی سقفی و سامانه تلفیقی سرمایش تابشی و جابجایی در یک فضای اداری از نظر شرایط آسایش حرارتی و کیفیت هوای داخلی در نرم‌افزار انسیس ایرپک به صورت عددی ارزیابی شده است. با توجه به غیریکنواخت بودن محیط مجهز به سیستم تابش سقفی، هدف اصلی از این پژوهش، ارزیابی شاخص‌های استاندارد آسایش حرارتی برای بخش‌های مختلف بدن فرد می‌باشد. نتایج نشان می‌دهد که در سیستم سرمایش تابشی سقفی در دماهای سقف 18 و 19 درجه سلسیوس شاخص میانگین آرای پیش‌بینی شده PMV و درصد نارضایتی پیش‌بینی شده PPD در بازه قابل‌قبول 5/0+>PMV>5/0- و %10>PPD قرار گرفته‌اند، ولی در دماهای سقف 20 تا 26 درجه سلسیوس، با افزایش دمای سقف مقادیر این شاخص‌ها افزایش یافته و فرد احساس گرمی می‌کند. در سامانه تلفیقی سرمایش تابشی و جابجایی مقادیر شاخص‌های آسایش حرارتی کلی در مقایسه با سیستم سرمایش تابشی سقفی در تمامی دماهای سقف و تمامی حالت‌های مختلف دریچه ورودی هوا کاهش یافته به طوری که در دمای سقف 20 درجه سلسیوس نیز شاخص‌های آسایش حرارتی کلی فرد بر اساس معیار استاندارد ISO 7730 و استاندارد55 ASHRAE/ANSIدر بازه مجاز قرار گرفته‌اند. شاخص‌های آسایش حرارتی موضعی کوران حرارتی DR و درصد نارضایتی PD در هر دو سیستم در محدوده مجاز بوده، در نتیجه نارضایتی حرارتی موضعی نمی‌تواند فرد ساکن را تهدید کند. همچنین استفاده از یک سامانه تلفیقی سرمایش تابشی و جابجایی به جای یک سیستم سرمایش تابشی سقفی بهبود کیفیت هوا را به دنبال خواهد داشت. | ||
| کلیدواژه‌ها | ||
| سرمایش تابشی سقفی؛ آسایش حرارتی؛ کیفیت هوا؛ نرم افزار انسیس ایرپک؛ چگالش بخار آب | ||
| عنوان مقاله [English] | ||
| Numerical Evaluation of Thermal Comfort and Indoor Air Quality in an Office Space Equipped with a Radiant Ceiling Cooling System and Hybrid Radiative-Convective Cooling System | ||
| نویسندگان [English] | ||
| Mohammad Amini1؛ Asgar Minaei2؛ Negin Moallemi Khiavi3 | ||
| 1M.Sc, Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran | ||
| 2Associate Professor, Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran | ||
| 3Ph.D in mechanical engineering, Tarbiat Modares University, Tehran, Iran | ||
| چکیده [English] | ||
| In the present paper, the performance of radiant ceiling and hybrid radiative-convective cooling systems in terms of thermal comfort and indoor air quality in an office space have been numerically evaluated by ANSYS Airpack software. Due to the non-uniformity of the environment equipped with radiant ceiling cooling system, the main purpose of this research is to evaluate the standard thermal comfort indexes for individual bodey parts. According to the results, for the radiant ceiling cooling system, at ceiling temperatures of 18°C and 19°C, the overall thermal comfort indexes of PMV (Predicted Mean Vote) and PPD (Predicted Percentage of Dissatisfied) are in the acceptable range of -0.5<PMV<+0.5 and PPD<10%. However, these indexes increased as the ceiling temperature increased from 20°C to 26°C, resulting in a feeling of hotness. The overall thermal comfort indexes of the hybrid radiative-convective cooling system have been reduced in comparison with the radiant ceiling cooling system at all ceiling temperatures and under all air inlet conditions, so that the overall thermal comfort indexes according to ISO 7730 standard and ASHRAE/ANSI standard 55 are within the permissible range even at temperature of 20 ℃. The local thermal comfort indexes DR (Draught Rating) and PD (Percentage of Dissatisfied) of both systems were within permissible limits, thus local thermal discomfort cannot threaten the resident. Also, a hybrid radiative-convective cooling system leads to higher indoor air quality than a radiant ceiling cooling system. | ||
| کلیدواژه‌ها [English] | ||
| Radiant ceiling cooling, Thermal comfort, Indoor air quality, ANSYS airpak software, Condensation of water vapor | ||
| مراجع | ||
|
[1] A. Koca, Z. Gemici, Y. Topacoglu, G. Cetin, R.C. Acet, and B.B. Kanbur. "Experimental investigation of heat transfer coefficients between hydronic radiant heated wall and room." Energy and Buildings 82 (2014): 211-221. [2] Y. Wu, P. Krishnan, E. Yu Liya, and M.H. Zhang. "Using lightweight cement composite and photocatalytic coating to reduce cooling energy consumption of buildings." Construction and Building Materials 145 (2017): 555-564. [3] J. Ngarambe, G. Young Yun, and M. Santamouris. "The use of artificial intelligence (AI) methods in the prediction of thermal comfort in buildings: Energy implications of AI-based thermal comfort controls." Energy and Buildings 211 (2020): 109807. [4] M. Maerefat, and A. Omidvar. “Thermal Comfort: Calculations and Design Considerations.” First edition, Yazda press (2013) (inPersian). [5] H. Jia, X. Pang, and P. Haves. "Experimentally-determined characteristics of radiant systems for office buildings." Applied energy 221 (2018): 41-54. [6] M. Andrés-Chicote, A. Tejero-González, E. Velasco-Gómez, and F. Javier Rey-Martínez. "Experimental study on the cooling capacity of a radiant cooled ceiling system." Energy and Buildings 54 (2012): 207-214. [7] K.N. Rhee, and K.W. Kim. "A 50 year review of basic and applied research in radiant heating and cooling systems for the built environment." Building and Environment 91 (2015): 166-190. [8] G.A. Florides, S.A. Tassou, S.A. Kalogirou, and L.C. Wrobel. "Review of solar and low energy cooling technologies for buildings." Renewable and Sustainable Energy Reviews 6, no. 6 (2002): 557-572. [9] M. Amini, R. Maddahian, and S. Saemi. "Numerical investigation of a new method to control the condensation problem in ceiling radiant cooling panels." Journal of Building Engineering 32 (2020): 101707. [10] A. Gramez, , and F. Boubenider. "Acoustic comfort evaluation for a conference room: A case study." Applied acoustics 118 (2017): 39-49. [11] M.S. Shin, K.N. Rhee, S.H. Park, M.S. Yeo, and K.W. Kim. "Enhancement of cooling capacity through open-type installation of cooling radiant ceiling panel systems." Building and Environment 148 (2019): 417-432. [12] S.Y. Qin, X. Cui, C. Yang, and L.W. Jin. "Thermal comfort analysis of radiant cooling panels with dedicated fresh-air system." Indoor and Built Environment 30, no. 10 (2021): 1596-1608. [13] J. Miriel, L. Serres, and A. Trombe. "Radiant ceiling panel heating–cooling systems: experimental and simulated study of the performances, thermal comfort and energy consumptions." Applied Thermal Engineering 22, no. 16 (2002): 1861-1873. [14] S.P. Corgnati, , M. Perino, G.V. Fracastoro, and P.V. Nielsen. "Experimental and numerical analysis of air and radiant cooling systems in offices." Building and Environment 44, no. 4 (2009): 801-806. [15] W.H. Chiang, C.Y. Wang, and J.S. Huang. "Evaluation of cooling ceiling and mechanical ventilation systems on thermal comfort using CFD study in an office for subtropical region." Building and Environment 48 (2012): 113-127. [16] S.A. Mumma. "Ceiling panel cooling systems." ASHRAE journal 43, no. 11 (2001): 28-32. [17] S.A. Mumma. "Condensation issues with radiant cooling panels." ASHRAE IAQ Applications (2001): 16-18. [18] D. Al Assaad, K. Ghali, and N. Ghaddar. "Effectiveness of intermittent personalized ventilation assisting a chilled ceiling for enhanced thermal comfort and acceptable indoor air quality." Building and environment 144 (2018): 9-22. [19] W. Jin, J. Jing, L. Jia, and Z. Wang. "The dynamic effect of supply water flow regulation on surface temperature changes of radiant ceiling panel for cooling operation." Sustainable Cities and Society 52 (2020): 101765. [20] H. E. Feustel, and C. Stetiu. "Hydronic radiant cooling—preliminary assessment." Energy and buildings 22, no. 3 (1995): 193-205. [21] A.A. Serageldin, M. Ye, A. Radwan, H. Sato, and K. Nagano. "Numerical investigation of the thermal performance of a radiant ceiling cooling panel with segmented concave surfaces." Journal of Building Engineering 42 (2021): 102450. [22] Y. Khan, V.R. Khare, J. Mathur, and M. Bhandari. "Performance evaluation of radiant cooling system integrated with air system under different operational strategies." Energy and Buildings 97 (2015): 118-128. [23] T. Catalina, J. Virgone, and J.J. Martin. "Evaluation of performances, thermal comfort and energy consumption of a reversible radiant ceiling by capillary mat: application for the prefabricated buildings." EPIC November 2006 (2006): 467-72. [24] H. Jia, X. Pang, and P. Haves. "Experimentally-determined characteristics of radiant systems for office buildings." Applied energy 221 (2018): 41-54. [25] Y. Yuan, X. Zhang, and X. Zhou. "A study on inherent correlation of thermal performances and condensation free control of the radiant system." Energy and Buildings 129 (2016): 19-31. [26] N. Moallemi Khiavi, M. Maerefat, and S.A. Zolfaghari. "Assessment of overall body thermal sensation based on the thermal response of local cutaneous thermoreceptors." Journal of thermal biology 83 (2019): 187-194. [27] N. Moallemi Khiavi, M. Maerefat, and S.A. Zolfaghari. "A new local index for predicting local thermal response of individual body segments." Journal of thermal biology 78 (2018): 161-173. [28] S. Gao, Y. Li, M. Zhao, Y. Wang, X. Yang, C. Yang, and L. Jin. "Design method of radiant cooling area based on the relationship between human thermal comfort and thermal balance." Energy Procedia 143 (2017): 100-105. [29] ISIRI 14384, “Determination of thermal comfort PMV and PPD indices and local thermal comfort criteria” Institute of Standards and Industrial Research of Iran. first edition, (2012) (inPersian). [30] Standard, ASHRAE, Standard 55–2017 thermal environmental conditions for human occupancy, Ashrae: Atlanta, GA, USA, (2017) [31] Fluent Inc, Airpak 3.0 User's Guid, (2007). [32] Z. Lin, and S. Deng. "A study on the thermal comfort in sleeping environments in the subtropics—developing a thermal comfort model for sleeping environments." Building and environment 43, no. 1 (2008): 70-81. [33] H. Zhang, E. Arens, C. Huizenga, and T. Han. "Thermal sensation and comfort models for non-uniform and transient environments: Part I: Local sensation of individual body parts." Building and Environment 45, no. 2 (2010): 380-388. [34] ISO, I., 7730: Ergonomics of the thermal environment Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria. International Organization for Standardization, (2005). [35] F. Causone, S.P. Corgnati, M. Filippi, and B.W. Olesen. "Experimental evaluation of heat transfer coefficients between radiant ceiling and room." Energy and buildings 41, no. 6 (2009): 622-628. [36] N. Morovat, M. Maerefat and S.A. Hosseini. “Ventilation and Thermal Performance in a Hybrid System Of Hydronic Radiant Cooling And Stratum Ventilation In a Residential room” Sharif Journal of Mechanical Engineering 31 no. 2 (2014):113-124 (inPersian). [37] N. Morovat, and M. Maerefat. “Analysis of thermal comfort in space equipped with stratum ventilation and radiant cooling ceiling” Modares Mechanical Engineering 13 no. 11 (2014):113-124 (inPersian).
| ||
|
آمار تعداد مشاهده مقاله: 219 تعداد دریافت فایل اصل مقاله: 212 |
||