Investigation of thermal performance of newly multilayer wall/roof constructions for low-carbon buildings

Yıl 2022, Cilt: 12 Sayı: 2, 71 - 78, 30.12.2022

Zeki Argunhan Hasan Oktay

https://doi.org/10.17678/beuscitech.1199799

Cited By: 1

Öz

Increasing concerns about energy consumption for heating and cooling of buildings have made it necessary to improve the thermal performance of building materials. However, in addition to using materials with high insulation characteristics, an accurate calculation of the capacities of the heating and cooling systems is also an important factor in ensuring high energy efficiency for low-carbon buildings. The devices will not be selected at capacities larger than the capacities that should be on this point and energy wastage will be prevented. To achieve this goal, in this study, investigations are carried out to produce new concrete types with high thermal insulating characteristics. Besides, many new concrete wall and roof samples were produced with different types of aggregates at different volume ratios and their thermophysical characteristics are tested in accordance with ASTM and EN standards. To estimate the thermal performance of produced samples, a periodic solution method, the Complex Finite Fourier Transform technique, is developed by using thermophysical characteristics data of those structures. The results showed that the daily heat gain values were calculated as 65.909 W/m2 for the EPC50 wall and 11.324 W/m2 for the PC40-EPC60 wall with 20 cm thicknesses.

Anahtar Kelimeler

Low carbon buiilding,, concrete,, heat gain,, thermophysical cjaracteristics,, complex finite Fourier transform technique.

Kaynakça

• [1] Ozbalta, N. 2010, The effects of insulation location and thermo-physical properties of various external wall materials on decrement factor and time lag, Scientific research and essays, 523, 3646-3659.
• [2] Erdal, G., Erdal, H., Esengün, K. 2008, The causality between energy consumption and economic growth in Turkey, Energy Policy, 3610, 3838-3842.
• [3] TMMOB Makine Mühendisleri Odası, MMO Yayın No: 2005/399 2005. ‘Yalıtım’ s.7-15,19-37,81-104
• [4] Think harder concrete. Cement Association of Canada. www.cement.ca/en/Think-harder-Concrete.html; 2013.
• [5] Cavanaugh, K., McCall, M. S. B. W. C., Speck, J. F., Musser, T. W. B. D. W., Spinney, S. C., Ries, K. D. C. J. P., Graber, D. W., 2002, Guide to thermal properties of concrete and masonry systems, American Concrete Institute, ACI.
• [6] Vaou, V., and Panias, D., 2010, Thermal insulating foamy geopolymers from perlite. Minerals Engineering, 2314, 1146-1151.
• [7] Real, S., Bogas, J. A., Gomes, M. D. G., Ferrer, B., 2016, Thermal conductivity of structural lightweight aggregate concrete. Magazine of Concrete Research, 6815, 798-808.
• [8] Uysal, H., Demirboğa, R., Şahin, R., Gül, R., 2004, The effects of different cement dosages, slumps, and pumice aggregate ratios on the thermal conductivity and density of concrete. Cement and concrete research, 34,5, 845-848.
• [9] Demirboğa, R., and Gül, R. 2003. The effects of expanded perlite aggregate, silica fume and fly ash on the thermal conductivity of lightweight concrete. Cement and Concrete Research, 335, 723-727.
• [10] Chandra, S., and Berntsson, L., 2002. Applications of Lightweight Aggregate Concrete, Lightweight Aggregate Concrete Science, Technology, and Applications. New York: William Andrew Inc, 369-400.
• [11] Argunhan, Z., 2017, Yapı elemanlarında kullanılan atık lastiklerin ısıl performansının incelenmesi, Dicle Üniversitesi Mühendislik Dergisi, 8 (3), 621-230.
• [12] Oktay, H., Yumrutaş, R., and Akpolat, A. 2015, Mechanical and thermophysical properties of lightweight aggregate concretes, Construction and Building Materials, 96, 217-225.
• [13] Bouguerra, A., Ledhem, A., De Barquin, F., Dheilly, R. M., Queneudec, M., 1998, Effect of microstructure on the mechanical and thermal properties of lightweight concrete prepared from clay, cement, and wood aggregates, Cement and concrete research, 288, 1179-1190.
• [14] Bansal, K., Chowdhury, S., & Gopal, M. R, 2008. Development of CLTD values for buildings located in Kolkata, India. Applied Thermal Engineering, 28, 10, 1127-1137.
• [15] ASHRAE Handbook, 1993, Fundamentals; ASHRAE: Atlanta. New York, NY, USA, 27-27.
• [16] De Rosa, M., Bianco, V., Scarpa, F. et al. (2016) Impact of wall discretization on the modeling of heating/cooling energy consumption of residential buildings, Energy Efficiency 9, 95-108.
• [17] Naji S., Shamshirband S., Basser H., Alengaram U. J., Jumaat M.Z., Amirmojahedi, M. (2015). Soft computing methodologies for estimation of energy consumption in buildings with different envelope parameters, Energy Efficiency. 9, 435–453.
• [18] Hahn, D. W., Ozisik, M. N., 2012. Heat conduction. John Wiley & Sons.
• [19] Ulgen, K., 2002. Experimental and theoretical investigation of effects of wall’s thermophysical properties on time lag and decrement factor. energy and buildings, 34, 3, 273-278.
• [20] Yumrutaş, R., Kaşka, Ö., and Yıldırım, E., 2007. Estimation of total equivalent temperature difference values for multilayer walls and flat roofs by using periodic solution. Building and Environment, 42, 5, 1878-1885.
• [21] Duffie, J.A., & Beckman, W.A. (1980). Solar engineering of thermal process, Wiley, New York.
• [22] Oktay, H., Yumrutaş, R., and Argunhan, Z. (2020). An experimental investigation of the effect of thermophysical properties on time lag and decrement factor for building elements. Gazi University Journal of Science, 33(2), 492-508.