Vegetalized Complex Partition (VCP): Impact of a Green Roof under a Humid Tropical Climate, Comparison between Hong Kong and Reunion Island

Abstract:

The aim of this paper is to present the experimental results of a specific vegetated complex partition (VCP) and discuss the conclusions found from an interesting study case in Hong Kong, especially the presence of a strong upward heat flux in winter. The experimented VCP configuration has never been tested in Reunion Island. It is located on a small scale building with a sloped roof covered with steel foil and under a humid tropical climate. From March to August, the extensive VCP reduced the global average heat flow by 91.61% and the ceiling temperature by 9.3°C, with a maximum average reduction of 18.9°C at noon. Compares to the results from Hong Kong, three of the four conclusions have been observed or deduced from the experimented VCP's results. The fourth conclusion (about heat flow loss in winter) has not been observed. But, based on the results, a precision of the explanation of its origin is proposed: the evaporation process act like a heat loss amplifier.

• Periodical: Applied Mechanics and Materials (Volume 705)
• Pages: 273-277
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.705.273
• Online since: December 2014
• Authors: Aurélien P. Jean*, Teddy Libelle, Frédéric Miranville, Mario A. Medina
• Keywords: Energy Performance, Green Roof, Thermal Impact, Tropical Environment, VCP, Vegetalized Complex Partition, Zosya Tenuifolia

References

[1] Hoeschele, K. and Schmidt, H. Klimatische wirkung elner dachbegrunung. Garten u Landschaft, 87 (1977) 334–337.

[2] Alar Teemusk, Ülo Mander, Temperature regime of planted roofs compared with conventional roofing systems, Ecological Engineering, 36 (2010) 91–95.

DOI: 10.1016/j.ecoleng.2009.09.009

[3] Liesecke, H. -J., Krupka, B., and Brueggemann, H. Ausfuhrung und unterhaltung von extensivbegruenungen und einfachen intensivbegruenungen., In Grundlagen der Dachbegruenung Zur Planung, page 18, Patzer Berlag, Berlin - Hannover, (1989).

[4] Renato M. Lazzarin, Francesco Castellotti, Filippo Busato, Experimental measurements and numerical modelling of a green roof, Energy and Buildings, 37 (2005) 1260–1267.

DOI: 10.1016/j.enbuild.2005.02.001

[5] R. Fioretti, A. Palla, L.G. Lanza, P. Principi, Green roof energy and water related performance in the Mediterranean climate, Building and Environment, 45 (2010) 1890-(1904).

DOI: 10.1016/j.buildenv.2010.03.001

[6] Eumorfopoulou E, Aravantinos D., The contribution of a planted roof to the thermal protection of buildings in Greece,. Energy and Buildings, 27 (1998) 29-36.

DOI: 10.1016/s0378-7788(97)00023-6

[7] Wong NH, Tay SF, Wong R, Ong CL, Sia A. Life cycle cost analysis of rooftop gardens in Singapore., Building and Environment, 38 (2003) 499-509.

DOI: 10.1016/s0360-1323(02)00131-2

[8] C.Y. Jim and Hongming He, Coupling heat flux dynamics with meteorological conditions in the green roof ecosystem, Ecological Engineering, 36 (2010) 1052–1063.

DOI: 10.1016/j.ecoleng.2010.04.018

[9] C.Y. Jim and S.W. Tsang, Biophysical properties and thermal performance of an intensive green roof, Building and Environment, 46 (2011) 1263-1274.

DOI: 10.1016/j.buildenv.2010.12.013

[10] Bigot, D., Miranville, F., Fakra, A., and Boyer, H. A nodal thermal model for photovoltaic, systems: Impact on building temperature fields and elements of validation for tropical and humid climatic conditions. Energy and Buildings, 41(9) : 1117–1126, (2009).

DOI: 10.1016/j.enbuild.2009.06.009