Influence of the reflectivity of the envelope on the energy demand of buildings and on thermal comfort
Keywords:
Albedo, Energy requirements, Orientation, Thermal mass, Thermal comfort, TRNSYSAbstract
In the urban environment, the nature of the materials that cover urban surfaces (sidewalks, facades and roofs) greatly affects the energy consumption and the thermal environment outside and inside the building, depending on the climate. The fraction of the incident solar energy reflected by the exterior elements of a structure significantly affects the overall heat gain or loss of the structure. In the building that is considered the world's largest energy-consuming sector, a judicious choice of coatings covering its external surfaces, particularly from the point of view of solar reflectivity, may be an adequate solution for saving energy by ensuring Level of thermal comfort with reduced energy consumption. This article presents a study aimed at assessing the effect of reflective coatings on reducing the building's energy requirements and improving indoor thermal comfort. In the town of Skikda, located in northeastern Algeria, characterized by the Mediterranean climate, a parametric study was carried out on a reference building, varying the solar reflectivity of its walls and roof, as well as others Such as its orientation, the thermal mass and the insulation of its envelope. The results show that a high solar reflectivity combined with thermal insulation defines an acceptable level of comfort and reduces the energy loads and that these effects are more significant for the roof than for the walls.
References
ONU "World urbanisation prospects 3, Progress in planning, 2011, AIE & PNUE, In J. J. Terrin, Villes et changements climatiques, ïlots de chaleur urbain, Ed. Parenthèses, Marseille, 2015, p10.
Romani Z., "Développement d’une méthode d’aide à la décision multicritère pour la onception des bâtiments neufs et la réhabilitation des bâtiments existants à haute efficacité energétique" , Thèse 2015, Université de La Rochelle, France
Nezzar S. and Goudache G., In Fezzioui N. et al., Influence des caractéristiques dynamiques de l’enveloppe d’un bâtiment sur le confort thermique au sud algérien, Revue des énergies renouvelables, 11 (1) (2008) 25–34.
Pigeon G., Lemonsu A., Masson V., Hidalgo J., De l’observationdu microclimat urbain à la modélisation intégrée de la ville, La Météorologie, 62 (2008) 62-39.
Taha H., Akbari H., Rosenfeld A. and Huang J., Residential cooling loads and the urban heat island: the effects of albedo, Build. Environ., 23 (4) (1988) 271–283.
Rosenfeld A., Akbari H., Bretz S., Fishman B. L., Kurn D. M., Sailorand D., Taha H., Mitigation of urban heat islands: materials, utility programs, updates, Energy Build., 22 (3) (1995) 255–265.
Akbari H., Bretz S., Kurnand D. M., Hanford J., Peak power andcooling energy savings of high-albedo roofs, Energy Build., 25 (2) (1997) 117–126.
Prado R.T.A., Ferreira F. L., Measurement of albedo and analysis of its influence the surface temperature of building roof materials,
Energy build., 35 (2005) 295-300.
Akbari H., Pomerantz M. & Taha H., Cool surfaces and shade trees to reduce energy use and improve air quality in urban areas, Solar
energy, 70 (3) (2001) 295–310.
Mansouri O., "L’influence de la réflectivité des matériaux (albédo) sur a modification du microclimat et sur le confort thermique
extérieur ans un canyon urbain", Mémoire de Magister, 2008, Université Mentouri, Contantine, Algérie,.
Givoni B. and Hoffiman M. E., Effect of building materials on internal temperatures, Technion, Israel Institute of Technology. Building Research Station., Ed. Haifa, 1968
Reagan J. A. and Acklam D. M., Solar reflectivity of common building materials and its influence on the roof heat gain of typical
southwestern U.S.A. residences, Energy Build., 2 (3) (1979) 237–248.
Bansal N. K., Gargand S. N., Kothari S.,Effect of exterior surface colour on the thermal performance of buildings, Build. Environ., 27 (1) (1992) 31–37.
Taha H., Sailor D., Akbari H., High albedo materials for reducing cooling energy use, Lawrence Berkeley Lab.1992, Rep. 31721, vol. UC-530, Berkeley CA. USA
Cheng V., Ngand E., Givoni B., Effect of envelope colour and thermal mass on indoor temperatures in hot humid climate, Sol. Energy, 78 (4), (2005) 528–534.
Uemoto K. L., Satoand N.M.N., John V.M., Estimating thermal performance of cool colored paints, Energy Build., 42 (1) (2010) 17–22.
Shen H., Tanand H., Tzempelikos A., The effect of reflective coatings on building surface temperatures , indoor environment and energy consumption: An experimental study, 43 (2011) 573–580.
Bozonnet E., Doya M. and Allard F., Cool roofs impact on building thermal response: A French case study, Energy Build., 43 (11) (2011) 3006–3012.
Pisello A. L., Cotana F.,The thermal effect of an innovative cool roof on residential buildings in Italy: Results from two years of continuous monitoring, Energy and Buildings, 69 (2014) 154–164.
Pisello A. L., Castaldo C., Piselli C., Pignatta G., Cotana F., The Combined thermal effect of cool roof and cool façade on a prototype building, Energy procedia, 78 (2015) 1556-1561.
Parker D. S., Barkaszi S. F., Sonne J. K., Measured cooling energy savings from reflective roof coatings in Florida, Phase II report, Rep. No. FSEC-CR-699-94, Florida Sol. Energy Center, Cape Canaveral, FL, 1994.
Simpson J. R. and Mcpherson E. G., The effects of roof albedo modification on cooling loads of scale model residences in Tucson , Arizona, 25 (2) (1997) 127-137.
Shariah A., Shalabi B., Rousanand A., Tashtoush B., Effects of absorptance of external surfaces on heating and cooling loads of residential buildings in Jordan, Energy Convers. Manag., 39 (3-4) (1998) 273–284.
Synnefa A., Santamouris M.and Akbari H., Estimating the effect of using cool coatings on energy loads and thermal comfort in residential buildings in various climatic conditions, Energy Build., 39 (11) (2007) 1167–1174.
Zinzi M., Daneoand A. and Fanchiotti A., Paper No 314: Optical properties and influence of reflective coatings on the energy demand
and thermal comfort in dwellings at Mediterranean latitudes, PLEA 2008, 25th Conf. Passiv. Low Energy Archit, Dublin, 22nd to 24th Oct. 2008, 314.
Lapisa R., Bozonnet E., Abadie M. O. and Salagnac P., Cool roof and ventilation efficiency as passive cooling strategies forcommercial low-rise buildings–ground thermal inertia impact, Advances in Building Energy Research, 7 (2) (2013) 192–208.
Capderou M., Atlas solaire de l’Algérie. Tome 2, Aspect énergétique. Edition OPU, Algérie, 1985, pp12.
Station météorologique de Skikda (2015)
"RNSYS 17", T. S. S. P. U. Manuel, Sol. Energy Lab. Univ. Wisconsin, Madison, USA
ISO 7730, Moderate thermal environment - determination of the PMV and PPD indices and specification of the conditions of thermal
comfort, Geneva. International Standards Organisations. 198
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