EFFECT OF ROOF POND ON THE ENERGY AND EXERGY PERFORMANCE OF A SINGLE SPACE BUILDING

Year 2017, Volume: 3 Issue: 3, 1275 - 1293, 01.07.2017

A. H. N. Khalifa

https://doi.org/10.18186/journal-of-thermal-engineering.323394

Abstract

In a hot, arid zone, the load imposed on the building due to the roof is more than that for all the four walls; one of
the proposed solutions to this condition is to use the roof pond. Using roof pond can reverse the performance of
roof from heat source to heat sink that can withdraw the heat from building envelope. In this work a mathematical
model, using the complex Fourier series was built for a single space building. Ambient temperature, solar radiation,
and sol-air temperature have been treated as a periodic function of time. The effect of roof pond on the indoor
temperature, heat flow to the building, temperature distribution through walls and roof were studied, as well as an
exergy analysis to the roof pond was achieved. The result showed that using roof pond can reduce the mean indoor
temperature by about 4 °C as compared with a building using the traditional roof. The exergy analysis showed that
the maximum exergy efficiency conjunct with the maximum exergy destruction through roof pond. 

Keywords

Roof pond, Passive cooling, thermal analysis, Exergy analysis

References

• [1] Sodha, M.S., Kumar, A., Singh, U., Tiwari, G.N., 1980a. Periodic theory of an open roof pond. Appl. Energy 7, 305–319.
• [2] Sodha, M.S., Srivastava, A., Kumar, A., Tiwari, G.N., 1980b. Heating and cooling buildings by flow of water over the roof. Appl. Energy 7, 229–242.
• [3] Srivastava, A., Tiwari, G.N., 1984. Experimental validation of a thermal model of an evaporative cooling system. Energy Convers. Manag. 24, 305–311.
• [4] Tang, R., Etzion, Y., 2004. On thermal performance of an improved roof pond for cooling buildings. Build. Environ. 39, 201–209.
• [5] Kharrufa, S.N., Adil, Y., 2008. Roof pond cooling of buildings in hot arid climates. Build. Environ. 43, 82–89.
• [6] Sabzi, D., Haseli, P., Jafarian, M., Karimi, G., Taheri, M., 2015. Investigation of cooling load reduction in buildings by passive cooling options applied on roof. Energy Build. 109, 135–142.
• [7] Hamdan, M.A., Al-Qudah, L.A., 2016. Performance Improvement of Shallow Solar Pond Using Nanoparticles. Int J Therm. Environ. Eng. 11, 0–0.
• [8] Anand Y, Anand S, Gupta A, Tyagi S. Building envelope performance with different insulating materials–An exergy approach. Journal of Thermal Engineering. 2015;1(4):433-9.
• [9] Beerends, R.J., 2003. Fourier and Laplace Transforms. Cambridge University Press.
• [10] ASHRAE, 2013 handbook of fundamentals .
• [11] Cengel, Y.A., 2007. Heat and mass transfer: a practical approach. McGraw-Hill, New York.
• [12]Yunus, C.A., Afshin, J.G., 2011. Heat and Mass Transfer: Fundamentals and Applications. Tata McGraw-Hill, New Delhi, India.
• [13] Marrero, T.R., Mason, E.A., 1972. Gaseous Diffusion Coefficients. J. Phys. Chem. Ref. Data 1, 3–118. doi:10.1063/1.3253094
• [14] Harbeck, G.E., 1958. Water-loss Investigations: Lake Mead Studies. U.S. Government Printing Office.
• [15] Borgnakke, C., Sonntag, R.E., 2016. Fundamentals of thermodynamics. Wiley Global Education.
• [16] Ranjan, K.R., Kaushik, S.C., 2013. Energy, exergy and thermo-economic analysis of solar distillation systems: A review. Renew. Sustain. Energy Rev. 27, 709–723.
• [17] Duffie, J.A., Beckman, W.A., 2013. Solar Engineering of Thermal Processes. John Wiley & Sons.