Experimental Investigation of Thermal Assessment of Smart Passive Cooling System

Article Preview

Abstract:

Energy consumption in conventional domestic housing in Oman is quite high due to cost intensive mechanical air conditioning systems. For the climate conditions in Oman, it is expected that energy conservation using smart passive cool roof will be valuable and significant. This paper presents the thermal assessment and energy efficiency of a novel forced convective evaporative cooling system with radiation reflector. The results revealed that the proposed smart passive cool system can reduce the indoor air temperature of the building models, with highest reduction in the room and roof surface temperature of 13.07 °C (36.7%) and 66.42 °C (75.7%) respectively. This is due to its ability to inhibit solar radiation and dissipate heat by evaporation, forced convection due to the dynamic behavior of air in the air ventilation between primary and secondary roofs, and nocturnal radiation. The research has conclusively demonstrated that the smart passive cool roof system presented significantly lower the heat fluxes through the roofs and can be applied to residential and commercial buildings for energy consrvation

You have full access to the following eBook

Info:

Periodical:

Pages:

53-62

Citation:

Online since:

March 2022

Export:

* - Corresponding Author

[1] Authority for Electricity Regulations, Oman, Annual Report 2018. https://www.aer.om/downloadsdocs/annual-reports/AnnualReportEnglish2018.pdf.

Google Scholar

[2] Fracastoro G. V., Glai L., Perino M. (1997) Reducing cooling loads with under roof air cavities, in: Proceedings of AIVC 18th Conference, Ventilation and Cooling, Athens, Greece. pp.477-486.

Google Scholar

[3] CSTB, (2002). Determination of the Thermal Performances of a Roof Ventilation System Grenoble, France, E-01-0005.

Google Scholar

[4] Wanphen S and Nagano K 2009 Experimental study of the performance of porous materials to moderate the roof surface temperature by its evaporative cooling effect Build Environ 44, 338−51.

DOI: 10.1016/j.buildenv.2008.03.012

Google Scholar

[5] Erens P J and Dreyer A (1993) Modeling of indirect evaporative coolers Int J Heat Mass Tran, 36 17−26.

DOI: 10.1016/0017-9310(93)80062-y

Google Scholar

[6] San Jose Alonso J et. al. (1998) Simulation model of an indirect evaporative cooler Energy Buildings, 29 23–27.

Google Scholar

[7] Khedari J., Yimsamerjit P., Hirunlabh J. (2002) Experimental investigation of free convection in roof solar collector. Building and Environment.. 37: 455 − 459.

DOI: 10.1016/s0360-1323(01)00054-3

Google Scholar

[8] Chang P-C, Chiang C-M, Lai C-M,( 2008.) Development and preliminary evaluation of double roof prototypes incorporating RBS (radiant barrier system), Energy & Buildings. 40:140–147.

DOI: 10.1016/j.enbuild.2007.01.021

Google Scholar

[9] Gagliano A., Patania F., Nocera F., Ferlito A. Galesi A., (2012)Thermal performance of ventilated roofs during summer period, Energy and Buildings.. 49:611–618.

DOI: 10.1016/j.enbuild.2012.03.007

Google Scholar

[10] Hirunlabh J., Wachirapuwadon S., Pratinthong N., Khedari J. (2001) New configurations of a roof solar collector maximizing natural ventilation. Building and Environment.36: 383 - 391.

DOI: 10.1016/s0360-1323(00)00016-0

Google Scholar

[11] Villi G., Pasut W., De Carli M. (2009), CFD modelling and thermal performance analysis of a wooden ventilated roof structure. Building Simulation 2. 215–228.

DOI: 10.1007/s12273-009-9414-7

Google Scholar

[12] Ciampi M., Leccese F., Tuono G. (2005) Energy analysis of ventilated and microventilated roofs. Solar Energy.. 79: 183 − 192.

DOI: 10.1016/j.solener.2004.08.014

Google Scholar

[13] Dimoudi A., Androutsopoulos A., 2006, Lykoudis S. Summer performance of a ventilated roof component. Energy and Buildings., 38: 610 − 617.

DOI: 10.1016/j.enbuild.2005.09.006

Google Scholar

[14] M. C. Yew, M. K.Yew, L. H. Saw ,T. ChingNg , K. P. Chen, D.R. kumar, J. HanBeh. (2018). Experimental analysis on the active and passive cool roof systems for industrial buildings in Malaysia. Journal of Building Engineering, 19, 134-141.

DOI: 10.1016/j.jobe.2018.05.001

Google Scholar

[15] Jorge L. Alvarado, Wilson Terrell, Jr., Michael D. Johnson, (2009), Passive cooling systems for cement-based roofs, Building and Environment 44, 1869–1875.

DOI: 10.1016/j.buildenv.2008.12.012

Google Scholar

[16] Anna Laura Pisello , Federico Rossi and Franco Cotana, (2014) Summer and Winter Effect of Innovative Cool Roof Tiles on the Dynamic Thermal Behavior of Buildings, Energies, 7, 2343-2361;.

DOI: 10.3390/en7042343

Google Scholar

[17] V. Kumar. (2020). Investigation of the thermal performance of coconut fibre composite with aluminium reflector cooling roofs, Environment, Development and Sustainability, 22:2207-2221, DOI 10.1007/s10668-018-0285-x.

DOI: 10.1007/s10668-018-0285-x

Google Scholar

[18] Alvarado, J. L., Terrell, W., Jr., & Johnson, M. D. (2009). Passive cooling systems for cement-based roofs, Building and Environment, 44, 1869–1875.

DOI: 10.1016/j.buildenv.2008.12.012

Google Scholar

[19] Mintorogo, D. S., Widigdo, W. K., & Juniwati, A. (2015). Application of coconut fibres as outer ecoinsulation to control solar heat radiation on horizontal concrete slab rooftop. Procedia Engineering, 125, 765–772.

DOI: 10.1016/j.proeng.2015.11.129

Google Scholar

[20] Solorzano, Lopez, Obaidi, (2020) Environmental design solutions for existing concrete flat roofs in low-cost housing to improve passive cooling in western Mexico, Journal of cleaner production, Vol.277, 123992 https://doi.org/10.1016/j.jclepro.2020.123992.

DOI: 10.1016/j.jclepro.2020.123992

Google Scholar

[21] X. Lu, P. Xu, Huilong, W.Tao, Y.J. Hou. (2016). cooling potential and applications prospects of passive radiative cooling in buildings: The current state-of-the-art. Renewable and Sustainable Energy Reviews, 65, 1079-1097.

DOI: 10.1016/j.rser.2016.07.058

Google Scholar