DETERMINATION OF SOME DOMESTIC RADIATORS’ THERMAL CAPACITY NUMERICALLY

Free convection and radiation comprise the heat transfer mechanisms through which a hydronic household radiator conveys heat from its surface to air and surrounding surfaces. It should also be noted that their performance could be enhanced by improving surface geometries as well as increasing temperature levels. In the present study, heat transfer rates and convective heat transfer coefficients occurring through the investigated radiators, were numerically examined. To this end, radiators at two different dimensions having two different geometric shapes were drawn and analyzed in the program Ansys 17. The heat transfer rates obtained from the program were validated via radiator producer catalogues. Furthermore, the influence of parameters, such as water velocity in the radiators and thus mass flow rate, temperature difference between water inlet and outlet and also between radiator surface and surrounding air on convective heat transfer coefficient over radiator, were scrutinized.

Keywords:

Radiator, Heat Transfer, Natural Convection, Radiation ANSYS,

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[1] Calisir, T., Yazar, H. O., Baskaya, S. and Yucedag, S (2016). Experimental and numerical prediction of flow field around a panel radiator. International Scientific Journal Journal of Environmental Science 5.
[2] Embaye, M., Al-Dadah, R. K., and Mahmoud, S. (2016). Numerical evaluation of indoor thermal comfort and energy saving by operating the heating panel radiator at different flow strategies. Energy and Buildings, 121, 298-308.
[3] R.J. Ladumor, V. Y Gajjar, and K.K.Araniya, (2014). A review paper on analysis of automobile radiator. International Conference on Multidisciplinary Research & Practice 1 388-393.
[4] Calisir, T., Baskaya, S., Yazar, H. O., and Yucedag, S. (2015). Parametric numerical investigation of heat transfer from convectors to improve efficiency of panel radiators. In ICHMT Digital Library Online. Begel House Inc.
[5] Kayastha, K. S. (2015). CFD simulation of heat transfer analysis of automobile radiator using helical tubes. International journal of engineering research and development, 11(1), 24-35.
[6] Embaye, M., Al-Dadah, R. K., and Mahmoud, S. (2015). Thermal performance of hydronic radiator with flow pulsation–Numerical investigation. Applied Thermal Engineering, 80, 109-117.
[7] Johansson, P. O., and Wollerstrand, J. (2010). Heat output from space heating radiator with add-on-fan blowers. In Excerpt from Proceedings the COMSOL Conference.
[8] Shi, H. L., Liu, Y., Shao, Y. Z., and Jin, Y. A. (2015, June). Optimization design of plate-type radiator. In International Conference on Computer Information Systems and Industrial Applications. Atlantis Press.
[9] Myhren, J. A., and Holmberg, S. (2009). Design considerations with ventilation-radiators: Comparisons to traditional two-panel radiators. Energy and buildings, 41(1), 92-100.
[10] Sarbu, I., and Sebarchievici, C. (2015). A study of the performances of low-temperature heating systems. Energy Efficiency, 8(3), 609-627.
[11] Aydar, E., and Ekmekci, I. (2012). Thermal efficiency estimation of the panel type radiators with CFD analysis. Journal of Thermal Science and Technology, 32, 63-71.
[12] Salvio Chacko, D., Shome, B., Kumar, V., Agarwal, A. K., and Katkar, D. R. Numerical Simulation for Improving Radiator Efficiency by Air Flow Optimization.
[13] Sevilgen, G., and Kilic, M. (2011). Numerical analysis of air flow, heat transfer, moisture transport and thermal comfort in a room heated by two-panel radiators. Energy and Buildings, 43(1), 137-146.
[14] Shati, A. K. A., Blakey, S. G., & Beck, S. B. M. (2011). The effect of surface roughness and emissivity on radiator output. Energy and buildings, 43(2-3), 400-406.
[15] Arslanturk, C., and Ozguc, A. F. (2006). Optimization of a central-heating radiator. Applied energy, 83(11), 1190-1197.
[16] Menéndez-Díaz, A., Ordóñez-Galán, C., Bouza-Rodríguez, J. B., and Fernández-Calleja, J. J. (2014). Thermal analysis of a stoneware panel covering radiators. Applied energy, 131, 248-256.
[17] Brady, L., Abdellatif, M., Cullen, J., Maddocks, J., and Al-Shamma’a, A. (2016). An investigation into the effect of decorative covers on the heat output from LPHW radiators. Energy and Buildings, 133, 414-422.
[18] Kılıç, M., Sevilgen, G., and Mutlu, M. (2014). Three-Dimensional Numerical Analysis of Thermal Output of a Steel Panel Radiator. In Progress in Exergy, Energy, and the Environment (pp. 585-593). Springer, Cham.
[19] Jahanbin, A., and Zanchini, E. (2016). Effects of position and temperature-gradient direction on the performance of a thin plane radiator. Applied Thermal Engineering, 105, 467-473.
[20] Beck, S. B., Blakey, S. G., and Chung, M. C. (2001). The effect of wall emissivity on radiator heat output. Building Services Engineering Research and Technology, 22(3), 185-194.
[21] Khalifa, A. J. N. (2001). Natural convective heat transfer coefficient–a review: I. Isolated vertical and horizontal surfaces. Energy conversion and management, 42(4), 491-504.
[22] Khalifa, A. J. N. (2001). Natural convective heat transfer coefficient–a review: II. Surfaces in two-and three-dimensional enclosures. Energy Conversion and Management, 42(4), 505-517.
[23] Demir, H., Dalkilic, A. S., Kürekci, N. A., Duangthongsuk, W., and Wongwises, S. (2011). Numerical investigation on the single phase forced convection heat transfer characteristics of TiO2 nanofluids in a double-tube counter flow heat exchanger. International Communications in Heat and Mass Transfer, 38(2), 218-228.
[24] Incropera, F. P., and DeWitt, D. P. (1996). Fundamentals of Heat and Mass Transfer. 4th edn John Wiley & Sons. New York.