Sıcak Sulu Isıtma Sistemlerinde Isıtıcı Tipinin Doğal Taşınımı Üzerindeki Etkisinin Sayısal İncelenmesi

Year 2025, Volume: 8 Issue: 2, 86 - 97, 31.12.2025

Muhammet Özdoğan

https://doi.org/10.55117/bufbd.1837660

Abstract

Bu çalışmada, farklı uzunluklara sahip odalarda sıcak sulu ısıtma sistemlerinde kullanılan iki yaygın yöntem olan radyatörle ısıtma ve yerden ısıtma sistemlerinin, oda içerisindeki doğal taşınım davranışı, sıcaklık dağılımı ve hız alanı üzerindeki etkileri sayısal olarak incelenmiştir. Bu kapsamda, 3 m, 5 m ve 7 m uzunluğundaki odalar ANSYS Fluent paket programında iki boyutlu olarak modellenmiş ve oluşturulan sayısal model literatürdeki deneysel verilerle karşılaştırılarak doğrulanmıştır. Analizler sonucunda, yerden ısıtma sisteminin farklı oda uzunluklarında ölçekten bağımsız, daha homojen ve dengeli bir ısıl performans sergilediği belirlenmiştir. Buna karşılık radyatörle ısıtma yönteminin lokal ısıtma karakteri nedeniyle oda uzunluğu arttıkça sıcaklık dengesizliğine ve daha yüksek hız gradyanlarına yol açtığı gözlemlenmiştir. Elde edilen bulgular, geniş hacimli iç mekânlarda yerden ısıtmanın ısıl konfor açısından daha avantajlı olduğunu ortaya koymaktadır.

Keywords

Doğal Taşınım , HAD , Odanın Isıtılması , Isı Transferi

Numerical Investigation of the Effect of Heater Type on Natural Convection in Hot-Water Heating Systems

Abstract

In this study, the effects of two commonly used hot-water heating methods radiator heating and underfloor heating on natural convection behavior, temperature distribution, and velocity fields inside rooms of different lengths were numerically investigated. For this purpose, rooms with lengths of 3 m, 5 m, and 7 m were modeled in two dimensions using the ANSYS Fluent software package. The numerical model was validated by comparison with experimental data from the literature. The results show that the underfloor heating system provides a scale-independent and more uniform thermal performance across different room lengths, while the radiator heating method, due to its local heating characteristics, leads to temperature non-uniformities and higher velocity gradients, particularly in longer rooms. The findings indicate that underfloor heating offers significant advantages in terms of thermal comfort in large indoor spaces.

Keywords

Natural Convection , CFD , Room Heating , Heat Transfer

References

• S. Venko, D. Vidal de Ventós, C. Arkar, and S. Medved, "An experimental study of natural and mixed convection over cooled vertical room wall," Energy and Buildings, vol. 68, pp. 387–395, 2014.
• G. A. Ganesh, S. L. Sinha, and T. N. Verma, "Numerical simulation for optimization of the indoor environment of an occupied office building using double-panel and ventilation radiator," Journal of Building Engineering, vol. 29, 2020.
• D. Tarek, N. Benamara, M. Aminallah, A. Lahcene, and S. Tewfik, "Influence of natural convection ventilation of the space between the roof and the false ceiling on the distribution of the temperature in a room," International Journal of Heat and Technology, vol. 41, no. 3, pp. 749–754, 2023.
• B. I. Basok, B. V. Davydenko, G. G. Farenuyk, and S. M. Goncharuk, "Computational modeling of the temperature regime in a room with a two-panel radiator," Journal of Engineering Physics and Thermophysics, vol. 87, no. 6, pp. 1433–1437, 2014.
• O. M. Oyewola, S. I. Afolabi, and O. S. Ismail, "Numerical simulation of natural convection in rectangular cavities with different aspect ratios," Frontiers in Heat and Mass Transfer, vol. 17, 2021.
• A. Anthony and T. Verma, "Numerical analysis of natural convection in a heated room and its implication on thermal comfort," Journal of Thermal Engineering, vol. 7, no. 1, pp. 37–53, 2021.
• G. Sevilgen and M. Kilic, "Numerical analysis of air flow, heat transfer, moisture transport and thermal comfort in a room heated by two-panel radiators," Energy and Buildings, vol. 43, no. 1, pp. 137–146, 2011.
• J. A. Myhren and S. Holmberg, "Flow patterns and thermal comfort in a room with panel, floor and wall heating," Energy and Buildings, vol. 40, no. 4, pp. 524–536, 2008.
• L. G. Carreto-Hernandez et al., "Analysis of natural convection in a representative cavity of a room considering oscillatory boundary conditions: An experimental and numerical approach," Int J Therm Sci, vol. 206, 2024.
• S. A. Mikhailenko, I. V. Miroshnichenko, and M. A. Sheremet, "Thermal radiation and natural convection in a large-scale enclosure heated from below: Building application," Building Simulation, vol. 14, no. 3, pp. 681–691, 2020.
• T. Calisir, H. O. Yazar, and S. Baskaya, "Determination of the effects of different inlet-outlet locations and temperatures on PCCP panel radiator heat transfer and fluid flow characteristics," Int J Therm Sci, vol. 121, pp. 322–335, 2017.
• M. El-Gendi, "Transient turbulent simulation of natural convection flows induced by a room heater," Int J Therm Sci, vol. 125, pp. 369–380, 2018.
• Y. Zhang, X. Li, and Q. Wang, “Numerical investigation of thermal comfort and airflow characteristics in rooms with different heating systems,” Building and Environment, vol. 217, pp. 109066, 2022.
• L. G. Carreto-Hernandez, S. L. Moya, C. A. Varela-Boydo, and A. Francisco-Hernandez, “Numerical– experimental study of mixed convection in a wind tower–room system,” Building and Environment, vol. 237, pp. 110302, 2023.
• "Theory Guide, ANSYS FLUENT 12.0," 2009.
• A. M. Rodrigues, A. C. da Piedade, A. Lahellec, and J. Y. Grandpeix, "Modelling natural convection in a heated vertical channel for room ventilation," (in English), Building and Environment, vol. 35, no. 5, pp. 455–469, Jul 2000.
• L. G. Carreto-Hernandez, S. L. Moya, C. A. Varela-Boydo, and A. Francisco-Hernandez, "Numericalexperimental study of mixed convection in a wind tower-room system," Building and Environment, vol. 237, 2023.
• F. Ampofo and T. G. Karayiannis, "Experimental benchmark data for turbulent natural convection in an air filled square cavity," International Journal of Heat and Mass Transfer, vol. 46, no. 19, pp. 3551–3572, 2003.