SIMULATION-BASED ANALYSIS OF THE EFFECT OF GREEN ROOFS ON THERMAL PERFORMANCE OF BUILDINGS IN A TROPICAL LANDSCAPE

Authors

  • Christian Koranteng Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
  • Barbara Simons Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
  • David Nyame-Tawiah Kwame Nkrumah University of Science and Technology, Kumasi, Ghana

DOI:

https://doi.org/10.23925/2179-3565.2021v12i1p45-56

Keywords:

Urban Heat Island, Thermal comfort, Kumasi, Urbanization, Climate change

Abstract

Apart from the ever- increasing population of most tropical urban cities, high ambient temperature, deteriorated comfort conditions, highly polluted environments are but a few of the problems these cities are confronted with. In the long run, increase energy demands both for production and the provision of comfortable spaces becomes necessary even though it’s a very scarce resource. It is widely known that Urban heat island (UHI) can significantly affect building’s thermal performance and as such, this study was conducted to find out how green roof which is a mitigating factor can reduce the thermal discomfort in indoor spaces. By means of dynamic simulation in EnergyPlus software, a numerical comparative analysis between eight scenarios was done in a tropical climate of Ghana, taking into account climatological, thermal, and hydrological variables. Two factors: Leaf Area Index (LAI) and Soil depth were the main determinants of the comparative analysis.  From the results, 5 out of the 8 scenarios was seen to all have performed better leading to a 1.5°C temperature reduction. Out of the 5, LAI5/70-150mm and LAI2/500mm suggest that at every point, there could be a reduction in indoor temperature if either LAI is larger or substrate depth is deep. A larger LAI and a deeper depth could also produce a favorable results (LAI5/500mm) though after a certain threshold, their effect weakens. Based on the findings, it is highly recommended that green roofs becomes part of the solution towards the fight against indoor thermal discomfort and not mechanical ventilation which could have a dire consequence on an already scare resource which is energy. 

References

ALI, S. B., PATNAIK, S., (2018). Thermal comfort in urban open spaces: Objective assessment and subjective perception study in tropical city of Bhopal, India. Urban Climate 24, pp. 954-967

ALJAWABRA, F., NIKOLOPOULOU, M., (2010). Influence of hot arid climate on the use of outdoor urban spaces and thermal comfort: do cultural and social backgrounds matter? Intell. Buildings Int. 2 (3), pp. 198–217.

ASHRAE Handbook. Heating, Ventilating, and Air-conditioning Systems and Equipment (I-P Edition) American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., Atlanta.

BERARDI, U., (2016). The outdoor microclimate benefits and energy saving resulting from green roofs retrofits. Energy & Build, 121, pp. 217-229

BERARDI, U., GHAFFARIANHOSEINI, A., GHAFFARIANHOSEINI, A., (2014). State-of-the-art analysis of the environmental benefits of green roofs, Appl. Energ. 115, pp. 411–428, http://dx.doi.org/10.1016/j.apenergy.2013.10.047.

BEVILACQUA, P., COMA, J., PEREZ, G., CHOCARRO, C., JUAREZ, A., SOL, C., DE SIMONE, M., CABEZA, L. F., (2015). Plant cover and floristic composition effect on thermal behavior of extensive green roofs, Building and Environment, 92, pp. 305-316

BING, Y., (2011). The research of ecological and economic benefits for green roof, Appl. Mech. Mater, pp. 2763–2766.

CHEN, Y., WONG, N. H., (2006). Thermal benefits of city parks, Energy Build. 38 (2), pp. 105–120.

CHUN, B., GULDMANN, J. M., (2018). Impact of greening on the urban heat island: seasonal variations and mitigation strategies, Comput. Environ. Urban Syst. 71, pp. 165–176.

CUI, Y., YAN, D., HONG, T., MA, J., (2017) .Temporal and spatial characteristics of the urban heat island in Beijing and the impact on building design and energy performance, Energy 130,pp. 286–297.

DA SILVEIRA HIRASHIMA, S.Q., DE ASSIS, E.S., NIKOLOPOULOU, M., (2016). Daytime thermal comfort in urban spaces: A field study in Brazil. Build. Environ. 107, 245–253.

DUNNETT, N., KINGSBURY, N., (2008). Planting Green Roofs and Living Walls. Timber Press, Portland.

EMILSSON T., CZEMIEL BERNDTSSON, J., MATTSSON, J. E., ROLF, K., (2007). Effect of using conventional and controlled release fertilizer on nutrient runoff from various vegetated roof systems. Ecol Eng., 29, pp. 260-271.

GARTLAND, L., (2008). Heat Islands: Understanding and Mitigating Heat in Urban Areas. Earthscan, London; Sterling, VA.

JAFFAL, I., OULDBOUKHITINE, S. E., BELARBI, R., (2012). A comprehensive study of the impact of green roofs on building energy performance, Renew. Energy. 43, pp. 157–164.

JIM, C. Y., TSANG, S.W., (2011). Biophysical properties and thermal performance of an intensive green roof. Build Environ, 46 (6), pp. 1263-1274

KARACHALIOU, P., SANTAMOURIS, M., PANGALOU, H., (2016). Experimental and numerical analysis of the energy performance of a large scale intensive green roof system installed on an office building in Athens, Energy Build. 114, pp. 256–264.

KJELLSTROM, T., BRIGGS, D., FREYBERG, C., LEMKE, B., OTTO, M., HYATT, O., (2016). Heat, Human Performance, and Occupational Health: a Key Issue for the Assessment of Global Climate Change Impacts, Annual Review of Public Health; pp. 97–112.

KOLOKOTSA, D., DIAKAKI, C., PAPANTONIOU, S., VLISSIDIS, A., (2012a). Numerical and experimental analysis of cool roofs application on a laboratory building in Iraklion Crete, Greece. Energy Build. https://doi.org/10.1016/j.enbuild.2011.09.011.

KOLOKOTSA, D., MARAVELAKI-KALAITZAKI, P., PAPANTONIOU, S., VANGELOGLOU, E., SALIARI, M., KARLESSI, T., SANTAMOURIS, M., (2012b). Development and analysis of mineral based coatings for buildings and urban structures. Sol. Energy. https://doi.org/10.1016/j. solener.2012.02.032.

LA ROCHE P, BERARDI U., (2014). Comfort and energy savings with active green roofs. Energy Build. 82, pp. 492-504.

LELIEVELD, J., PROESTOS, Y., HADJINICOLAOU, P., TANARHTE, M., TYRLIS, E., ZITTIS, G., (2016). Strongly increasing heat extremes in the Middle East and North Africa (MENA) in the 21st century. Clim. Chang. 137 (1), pp. 245–260.

LI, D., SUN, T., LIU, M., YANG, L., WANG, L., GAO, Z., (2015). Contrasting responses of urban and rural surface energy budgets to heat waves explain synergies between urban heat islands and heat waves, Environ. Res. Lett. 10 (5)

LULLA, V., STANFORTH, A., PRUDENT, N., JOHNSON, D., LUBER, G., (2015). Modeling Vulnerable Urban Populations in the Global Context of a Changing Climate, Innovating for Healthy Urbanization; pp. 193–208.

NAVIGANT CONSULTING, (2009). Assessment of International Urban Heat Island Research: Review and Critical Analysis of International UHI Studies. U.S. Department of Energy, Washington, D.C. Retrieved from. http://www.eereblogs.energy.gov/buildingenvelope/file. axd?file=2011/10/uhi_report.pdf.

NIACHOU, A., PAPAKONSTANTINOU, K., SANTAMOURIS, M., TSANGRASSOULIS, A., MIHALAKAKOU, G., (2001). Analysis of the green roof thermal properties and investigation of its energy performance, Energy Build. 33 (2001) 719–729, http://dx.doi. org/10.1016/S0378-7788 (01)00062-7.

OLIVEIRA, S., ANDRADE, H., VAZ, T., (2011). The cooling effect of green spaces as a contribution to the mitigation of urban heat: a case study in Lisbon, Build. Environ. 46 (11), pp. 2186–2194.

PECK, S.W., CALLAGHAN, C., KUHN, M. E., BASS, B., (1999). Greenbacks from green roofs: Forging a new industry in Canada. Canada Mortgage and Housing Corporation. Ottawa, Canada.

PINO, A., WALDO, B. W., ESCOBAR, R., PINO, F.E., (2012). Thermal and Lighting Behaviour of Office Buildings in Santiago of Chile. Available at: www.elsevier.com/locate/enbuild. Accessed 25/02/2019

QIN, X., WU, X., CHIEW, Y., LI, Y., (2012). A green roof test bed for storm water management and reduction of urban heat island effect in Singapore, Br. J. Environ. Clim. Change 2, pp. 410–420.

RAJI, B., TENPIERIK, M. J., VAN DEN DOBBELSTEEN, A., (2015). The impact of greening systems on building energy performance: a literature review. Renew Sustain Energy Rev, 45: pp. 610–23. https://doi.org/10.1016/J.RSER.2015.02.011.

REFAHI, A. H., TALKHABI, H., (2015). Investigating the effective factors on the reduction of energy consumption in residential buildings with green roofs. Renew Energy, 80, pp. 595–603.

ROCKLÖV, J., FORSBERG, B., EBI, K., BELLANDER, T., (2014). Susceptibility to mortality related to temperature and heat and cold wave duration in the population of Stockholm County, Sweden, Glob. Health Action 7 (1).

ROSE, A. L., (2010). Impact of urbanization on the thermal comfort conditions in the hot humid city of Chennai, India. In: Recent Advances in Space Technology Services and Climate Change (RSTSCC), pp. 262–267 (November).

ROSENZWEIG, C., SOLECKI, W., ROMERO-LANKAO, P., MEHROTRA, S., DHAKAL, S., BOWMAN, T., ALI IBRAHIM, S., (2015). ARC3.2 summary for city leaders. In: Urban Climate Change Research Network. Columbia University, New York.

SAADATIAN, O., SOPIAN, K., SALLEH, E., LIM, C.H., RIFFAT, S., SAADATIAN, E., TOUDESHKI, A., SULAIMAN, M.Y., (2013). A review of energy aspects of green roofs, Renew. Sustain. Energy Rev. 23 (2013) 155–168.

SAARONI, H., AMORIMB, J.H., HIEMSTRAC, J. A., D. PEARLMUTTER, D., (2018). Urban Green Infrastructure as a tool for urban heat mitigation: Survey of research methodologies and findings across different climatic regions. Urban Climate 24, pp. 94-110

SANTAMOURIS, M., 2013. Using cool pavements as a mitigation strategy to fight urban heat island- a review of the actual developments. Renew. Sust. Energ. Rev. 26, pp. 224–240.

SANTAMOURIS, M., (2012). Cooling the cities – a review of reflective and green roof mitigation technologies to fight heat island and improve comfort in urban environments. Sol. Energy.

SANTAMOURIS, M., PAVLOU, C., DOUKAS, P., MIHALAKAKOU, G., SYNNEFA, A., HATZIBIROS, A., (2007). Investigating and analyzing the energy and environmental performance of an experimental green roof system installed in a nursery school building in Athens, Greece. Energy, 32: pp, 1781–1788. https://doi.org/10.1016/J.ENERGY.2006.11.011.

STAFOGGIA, M., FORASTIERE, F., AGOSTINI, D., CARANCI, N., DE'DONATO, F., DEMARIA, M., MICHELOZZI, P., MIGLIO, R., ROGNONI, M., RUSSO, A., PERUCCI, C.A., (2008). Factors affecting in hospital heat-related mortality: a multi-city case-crossover analysis, J. Epidemiol. Community Health 62 (3), pp. 209–215.

SUN, T., BOU-ZEID, E., ZWANG, Z. H., ZERBA, E., NI, G. H., (2013). Hydrometeorological determinants of green roof performance via a vertically-resolved model for heat and water transport, Build. Environ. 60, pp. 211–224.

TAKEBAYASHI, H., MORIYAMA, M., (2009). Study on the urban heat island mitigation effect achieved by converting to grass-covered parking. Sol. Energy 83 (8), pp. 1211–1223.

WOLF, D., LUNDHOLM, J. T., (2008). Water uptake in green roof microcosms: effects of plant species and water availability. Ecol Eng., 33, pp. 179–86.

WONG, N. H., CHEN, Y., ONG, C. L., SIA, A., (2003). Investigation of thermal benefits of rooftop

garden in the tropical environment. Build Environ, 38(2):pp. 261-270.

XU, X., GONZÁLEZ, J.E., SHEN, S., MIAO, S., DOU, J., (2018). Impacts of urbanization and air pollution on building energy demands — Beijing case study, Appl. Energy 225, pp. 98–109.

YANG, J., CHONG, A., SANTAMOURIS, M., KOLOKOTSA, D., LEE, S.E., THAM, K.W., SEKHAR, C., CHEONG, D., (2017). Using energy utilizability as a retrofitting solution selection criterion for buildings; J. Civil Eng. Manage. https://doi.org/10.3846/13923730.2017. 1323794.

YANG, J., KUMAR, D. I. M., PYRGOU, A., CHONG, A., SANTAMOURIS, M., KOLOKOTSA, D., LEE, S. E., (2018). Green and cool roofs’ urban heat island mitigation potential in tropical Climate. Solar Energy 173, pp. 597-609.

YANG, W., WANG, Z., CUI, J., ZHU, Z., ZHAO, X., (2015). Comparative study of the thermal performance of the novel green (planting) roofs against other existing roofs. Sustainable Cities and Society, 16, pp. 1-12.

ZHANG, Y., ZHAO, R., (2009). Relationship between thermal sensation and comfort in non-uniform and dynamic environments. Build. Environ. 44 (7), pp. 1386–1391.

ZHANG, L., FUKUDA, H., LIU, Z., (2019). Households' willingness to pay for green roof for mitigating heat island effects in Beijing (China). Building and Environment, 150, pp. 13-20.

ZHENG, B. W., LI, Z. L., GUO, J. X., (2014). Introduction to the Urban Space Stereo Greening, Applied Mechanics and Materials, pp. 1696–1700.

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Published

2021-04-12

Issue

Vol. 12 No. 1 (2021)

Section

Papers

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