Thermal Performance of Hollow Clay Brick with Low Emissivity Treatment in Surface Enclosures
Source abstract
Abstract
External walls made with hollow clay brick or block are widely used for their thermal, acoustic and structural properties. However, the performance of the bricks frequently does not conform with the minimum legal requirements or the values required for high efficiency buildings, and for this reason, they need to be integrated with layers of thermal insulation. In this paper, the thermal behavior of hollow clay block with low emissivity treatment on the internal cavity surfaces has been investigated. The purpose of this application is to obtain a reduction in the thermal conductivity of the block by lowering the radiative heat exchange in the enclosures. The aims of this paper are to indicate a methodology for evaluating the thermal performance of the brick and to provide information about the benefits that should be obtained. Theoretical evaluations are carried out on several bricks (12 geometries simulated with two different thermal conductivities of the clay), using a finite elements model. The heat exchange procedure is implemented in accordance with the standard, so as to obtain standardized values of the thermal characteristics of the block. Several values of emissivity are hypothesized, related to different kinds of coating. Finally, the values of the thermal transmittance of walls built with the evaluated blocks have been calculated and compared. The results show how coating the internal surface of the cavity provides a reduction in the thermal conductivity of the block, of between 26% and 45%, for a surface emissivity of 0.1.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Phase Change Materials Research · Building Energy and Comfort Optimization · Solar Energy Systems and Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Industrial Engineering and Mathematical Sciences, Università Politecnica delle Marche, Via Brecce Bianche 12, 60131 Ancona, Italy
References (26)
Show source-provided references
1. (2010). Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the Energy Performance of Buildings, European Commission.
2. (2012). Directive 2012/27/EU of the European Parliament and of the Council of 25 October 2012 on Energy Efficiency, Amending Directives 2009/125/EC and 2010/30/EU and Repealing Directives 2004/8/EC and 2006/32/EC Text with EEA Relevance, European Commission.
3. (2006). Decreto Legislativo 29 dicembre 2006, n. 311. Disposizioni correttive ed integrative al Decreto Legislativo 19 agosto 2005, n. 192, recante attuazione della direttiva 2002/91/CE, relativa al rendimento energetico nell’edilizia, Gazzetta Ufficiale della Repubblica Italiana. (In Italian).
4. Analysis and optimization of the heat-insulating light concrete hollow brick walls design by the finite element method10.1016/j.applthermaleng.2006.10.010 ↗
5. Study of the geometry of a voided clay brick using non-rectangular perforations to optimize its thermal properties10.1016/j.enbuild.2011.06.006 ↗
6. Study of the geometry of a voided clay brick using rectangular perforations to optimize its thermal properties10.1016/j.applthermaleng.2011.02.033 ↗
7. Optimization of concrete hollow brick using hybrid genetic algorithm combining with artificial neural networks10.1016/j.ijheatmasstransfer.2010.07.006 ↗
8. Optimization of the configuration of 290 × 140 × 90 hollow clay bricks with 3-D numerical simulation by finite volume method10.1016/j.enbuild.2008.03.010 ↗
9. Nonlinear thermal optimization of external light concrete multi-holed brick walls by the finite element method10.1016/j.ijheatmasstransfer.2007.07.029 ↗
10. Experimental and numerical investigation of a hollow brick filled with perlite insulation10.1016/j.enbuild.2010.03.009 ↗
11. Low emissivity coatings on architectural glass10.1016/S0257-8972(97)00034-0 ↗
12. Silver-based low-emissivity coatings for architectural windows: Optical and structural properties
13. Durability improvement of Ag-based low-emissivity coatings10.1016/0022-3093(94)90292-5 ↗
14. Multi-layer heat insulation system for frame construction buildings10.1016/j.enbuild.2010.11.016 ↗
15. Thermal analysis of above-grade wall assembly with low emissivity materials and furred airspace10.1016/j.buildenv.2011.01.009 ↗
16. Thermal response of basement wall systems with low-emissivity material and furred airspace10.1177/1744259111411652 ↗
17. Numerical modeling and experimental investigations of thermal performance of reflective insulations10.1177/1744259112444021 ↗
18. Steady state theoretical model of fired clay hollow bricks for enhanced external wall thermal insulation10.1016/j.buildenv.2007.10.005 ↗
19. Thermal analysis of the application of pcm and low emissivity coating in hollow bricks10.1016/j.enbuild.2012.04.022 ↗
20. COMSOL Multiphysics. Available online:http://www.comsol.it/.
21. (1995). EN ISO 10211-1:1995 Thermal Bridges in Building Construction—Heat Flows and Surface Temperatures—Part 1: General Calculation Methods, European Committee for Standardization.
22. (2002). BS EN 1745:2002 Masonry and Masonry Products. Methods for Determining Design Thermal Values, European Committee for Standardization.
23. (1996). EN ISO 6946:1996 Building Components and Building Elements—Thermal Resistance and Thermal Transmittance—Calculation Method, European Committee for Standardization.
24. (2005). Attuazione Della Direttiva 2002/91/CE Relativa al Rendimento Energetico Nell’edilizia, Gazzetta Ufficiale della Repubblica italiana. (In Italian).
25. (2006). Disposizioni Correttive ed Integrative al Decreto Legislativo 19 Agosto 2005, n. 192, Rec Ante Attuazione Della Direttiva 2002/91/CE Relativa al Rendimento Energetico Nell’edilizia, Gazzetta Ufficiale della Repubblica italiana. (In Italian).
26. (2009). Regolamento di Attuazione Dell’articolo 4, Comma1, Lettere a) e b),del decreto19 agosto 2005, n.192, Concernente Attuazione Della Direttiva 2002/91/CE sul Rendimento Energetico in Edilizia, Gazzetta Ufficiale della Repubblica italiana. (In Italian).