Dynamic thermal behavior and cooling transmission loads of insulated concrete walls under varying environmental conditions for humid subtropical climate

Revista de Engenharia Civil IMED

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Title Dynamic thermal behavior and cooling transmission loads of insulated concrete walls under varying environmental conditions for humid subtropical climate
Comportamento térmico dinâmico e cargas de transmissão de resfriamento de paredes de concreto isoladas sob diferentes condições ambientais do clima subtropical úmido
 
Creator Zenginis, Dimitrios
Kontoleon, Karolos
Torres, Maurício Carvalho Ayres
 
Subject Engenharia Civil, Termodinâmica
insulation tickness; insulation position; thermal performance

Paredes de concreto; Orientação de paredes; Espessura de isolamento; Tempera-tura de design interior. Cargas de transmissão de refrigeração
 
Description In this study, the effect of insulation thickness and its position on the dynamic thermal characteristics of concrete walls is examined numerically. Regarding the effect of the thermal insulation layer, nine different wall configurations are studied. The analysis is carried out for wall elements with a varying orientation corresponding to each cardinal point for the cooling period and more specifically for the climatic conditions of Thessaloniki, Greece, which climate is classified as Humid Subtropical according to Köppen Climate Classification System, which is the same of Porto Alegre, in Brasil. In addition, diurnal cooling transmission loads are calculated by considering different indoor design temperatures; for the aims of this investigation three typical indoor design temperatures are taken into account (increasing from 24 oC to 28 oC, in steps of 2 oC). Results underline the significance of insulation thickness and position to maintain a stable indoor environment with low temperature fluctuations (decreasing ratio of heat wave temperature amplitudes, decrement factor), as well as to shift adequately the occurred temperature peaks to the inner surface (time delay of heat wave propagation, time lag). It is also seen that north and south oriented walls provide minimum cooling loads compared to walls facing east and west. Furthermore, as the indoor design temperature increases the cooling transmission loads decrease. The thermal performance of insulated concrete walls is studied by using the thermal-network modelling method under steady periodic conditions.
Neste estudo, o efeito da espessura do isolamento e sua posição nas características térmicas dinâmicas das paredes de concreto é examinado numericamente. Quanto ao efeito do isolamento térmico, são estudadas nove diferentes configurações de parede. A análise é realizada para elementos de parede com uma orientação variável correspondente a cada ponto cardinal para o período de resfriamento e mais especificamente para as condições climáticas de Salónica, na Grécia, que tem a mesma classificação climática – subtropical úmido - pelo Sistema Köppen que Porto Alegre, no Rio Grande do Sul, Brasil. Além disso, as cargas de transmissão de resfriamento diurno são calculadas considerando diferentes temperaturas de projeto interno. Para os objetivos desta investigação, são consideradas três temperaturas típicas de design interno (aumentando de 24 ºC a 28 ºC, em passos de 2 ºC). Os resultados sublinham o significado da espessura e posição do isolamento para manter um ambiente interno estável com baixas flutuações de temperatura (proporção decrescente das amplitudes de temperatura da onda de calor, fator de decréscimo), bem como para mudar adequadamente os picos de temperatura ocorridos para a superfície interna (atraso de tempo de propagação de onda de calor, intervalo de tempo). Também é visto que as paredes orientadas norte e sul fornecem cargas de resfriamento mínimas em comparação com as paredes voltadas para o leste e o oeste. Além disso, à medida que a temperatura do projeto interno aumenta, as cargas de transmissão de resfriamento diminuem. O desempenho térmico de paredes de concreto isoladas é estudado usando o método de modelagem de rede térmica em condições periódicas estáveis.
 
Publisher Complexo de Ensino Superior Meridional S.A.
 
Contributor

 
Date 2018-07-01
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

 
Format application/pdf
text/html
 
Identifier https://seer.imed.edu.br/index.php/revistaec/article/view/2288
10.18256/2358-6508.2018.v5i1.2288
 
Source Revista de Engenharia Civil IMED; v. 5, n. 1 (2018): Jan.-Jun.; 87-101
2358-6508
2358-6508
10.18256/2358-6508.2018.v5i1
 
Language eng
 
Relation https://seer.imed.edu.br/index.php/revistaec/article/view/2288/1889
https://seer.imed.edu.br/index.php/revistaec/article/view/2288/1890
/*ref*/AL-SANEA, S.A.; ZEDAN, M.F.; AL-MUJAHID, A.M.; AL-SUHAIBANI, Z.A. Optimum R-values of building walls under different climatic conditions in the Kingdom of Saudi Arabia. Applied Thermal Engineering, v. 96, p. 92-106, 2016. doi: https://doi.org/10.1016/j.applthermaleng.2015.11.072
/*ref*/ASAN, H. Effects of wall’s insulation thickness and position on time lag and decrement factor. Energy and Building, v. 28, n. 3, p. 299-305, 1998. doi: https://doi.org/10.1016/S0378-7788(98)00030-9
/*ref*/ASAN, H. Investigation of wall’s optimum insulation position from maximum time lag and minimum decrement factor point of view. Energy and Building, v. 32, n. 2, p. 197-203, 2000. doi: https://doi.org/10.1016/S0378-7788(00)00044-X
/*ref*/ÇENGEL, Y.A. Heat Transfer: A Practical Approach. Mc Graw-Hill, 2003.
/*ref*/EUROPEAN COMMISSION. Directive 2010/31/EU of the European parliament and the council of 30 November 2016 on the energy performance of buildings. 2016.
/*ref*/KONTOLEON, K.J.; EUMORFOPOULOU, E.A. The influence of wall orientation and exterior surface solar absorptivity on time lag and decrement factor in the Greek region. Renewable Energy, v. 33, n. 7, p. 1652-1664, 2008. doi: https://doi.org/10.1016/j.renene.2007.09.008
/*ref*/MAZZEO, D.; OLIVETI, G.; ARCURI, N. Definition of a new set of parameters for the dynamic thermal characterization of PCM layers in the presence of one or more liquid-solid interfaces. Energy and Buildings, v. 141, p. 379-396, 2017. doi: https://doi.org/10.1016/j.enbuild.2017.02.027
/*ref*/OZEL, M. Effect of insulation location on dynamic heat-transfer characteristics of building external walls and optimization of insulation thickness. Energy and Buildings, v. 72, p. 288-295, 2014. doi: https://doi.org/10.1016/j.enbuild.2013.11.015
/*ref*/OZEL, M. Effect of indoor design temperature on the heating and cooling transmission loads. Journal of Building Engineering, v. 7, p. 46-52, 2016. doi: https://doi.org/10.1016/j.jobe.2016.05.001
/*ref*/PEKDOGAN, T.; BASARAN, T. Thermal performance of different exterior wall structures based on wall orientation. Applied Thermal Engineering, v. 112, p. 15-24, 2017. doi: https://doi.org/10.1016/j.applthermaleng.2016.10.068
/*ref*/SHAIK, S.; TALANKI, A.B.P.S. Optimizing the position of insulating materials in flat roofs exposed to sunshine to gain minimum heat into buildings under periodic heat transfer conditions. Environmental Science and Pollution Research, v. 23, n. 10, p. 9334-9344, 2016. doi: https://doi.org/10.1007/s11356-015-5316-7
/*ref*/SHARIFI, N.P.; SHAIKH, A.A.N.; SAKULICH, A.R. Application of phase change materials in gypsum boards to meet building energy conservation goals. Energy and Buildings, v. 138, p. 455-467, 2017. doi: https://doi.org/10.1016/j.enbuild.2016.12.046
/*ref*/TECHNICAL CHAMBER OF GREECE. Energy Performance of Buildings Directive - Technical Guidelines - T.O.T.E.E. 20701-1/2010 - Guidelines on the evaluation of the energy performance of buildings. 2010.
/*ref*/THIELE, A.M.; LIGGET, R.S.; SANT, G.; PILON, L. Simple thermal evaluation of building envelopes containing phase change materials using a modified admittance method. Energy and Buildings, v. 145, p. 238-250, 2017. doi: https://doi.org/10.1016/j.enbuild.2017.03.046
/*ref*/UNITED NATIONS ENVIRONMENT PROGRAMME. Buildings and Climate Change: summary for decision makers. Sustainable Buildings and Climate Initiative, United Nations Environmental Programme, 2009. doi: https://doi.org/10.1007/978-1-4471-4781-7_2
 
Rights Direitos autorais 2018 Dimitrios Zenginis, Karolos Kontoleon, Maurício Torres
http://creativecommons.org/licenses/by/4.0
 

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