Field Investigation of the Small House with the Ventilated Roof Tiles

Abstract:

This paper investigates the thermal performances and heat gain reduction of a new roof tile design referred as Ventilated Roof Tile (VRT) compared with an ordinary corrugated concrete roof tiles (CCR). The outside dimension of each small house was 1.70 x 1.70 x 2.85 m³ (W x L x H) and inside dimension was 1.50 x 1.50 x 2.20 m³. The volume of each room was 4.95 m³. The gable roofs slope were 25^o and surface area of VRT was 2.58 m² per each side facing north and south. The VRT tile composed of upper cement plate 40 × 40 cm² and lower cement plate 30 x 40 cm². Between plates was 3 cm thickness air gap. The experimental results showed that the top surface of VRT was lower than CCR about 2.10°C for average temperature (from 6:00 18:00) and made VRT room temperature lower than CCR about 1.41°C for average temperature. VRT could reduce heat gain with air flow rate through the roof tiles gaps varied following the solar radiation, during time 8:00-17:00 the natural ventilation varied from 0.003-0.014 m³/s (10.6-50.0 m³/hr.). Observed that, during 17:00-18:00, the air flow rate is about 0.003 m³/s (10.8 m³/hr.) due to heat accumulated in the attic space and roof tiles.

• Periodical: Advanced Materials Research (Volumes 931-932)
• Pages: 1233-1237
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.931-932.1233
• Online since: May 2014
• Authors: Onvalee Amornleetrakul, Withaya Puangsombut*, Jongjit Hirunlabh
• Keywords: Air Gap, Attic, Heat Gain, Roof Tiles Ventilated

References

[1] M. Ciampi, F. Leccese and G. Tuoni, Energy analysis of ventilated and micro ventilated roofs, Solar Energy, 79 (2005), 183-192.

DOI: 10.1016/j.solener.2004.08.014

[2] J. Khedari, W. Mansirisub, S. Chaima, N. Pratinthong and J. Hirunlabh, Field measurement of performance of roof solar collector, Energy and building, 31 (2000), 171-178.

DOI: 10.1016/s0378-7788(99)00003-1

[3] J. Waewsak, J. Hirunlabh, J. Khedari and U. C. Shin, Performance evaluation of the BSRC multi-purpose bio-climatic roof, Building and Environment, 38 (2003), 1297–1302.

DOI: 10.1016/s0360-1323(03)00116-1

[4] W. Puangsombut, J. Hirunlabh, J. Khedari, B. Zeghmati and M. M. Win, Enhancement of natural ventilation rate and attic heat gain reduction of roof solar collector using radiant barrier, Building and Environment, 42 (2007) 2218–2226.

DOI: 10.1016/j.buildenv.2005.09.028

[5] W. Puangsombut, J. Hirunlabh, J. Khedari and B. Zeghmati, An experimental study of free convection in an inclined rectangular channel using radiant barrier, Experimental Heat Transfer, 20 (2007), 171-184.

DOI: 10.1080/08916150601091514