Optimizing Urban Layout for Solar Mitigation and Microclimate Regulation in Hot-Arid Coastal Resorts: A Parametric Simulation Study
DOI:
https://doi.org/10.15377/2409-9821.2026.13.1Keywords:
Urban morphology, Hot-arid architecture, Microclimate regulation, Solar radiation mitigation, Sustainable tourism resorts.Abstract
The rapid expansion of tourism infrastructure in hot-arid coastal regions exacerbates energy demands and environmental stress, yet evidence-based urban design guidelines for low-density resorts remain underdeveloped. This study investigates the influence of urban layout design (ULD) on façade solar exposure and microclimate regulation, using Egypt's Red Sea coast as a case study. Its purpose is to identify morphological strategies that reduce solar heat gain, lower cooling energy demand, and enhance outdoor thermal comfort while facilitating renewable energy integration.
A systematic parametric approach was employed, using TownScope-3 to generate and simulate 252 urban layout scenarios. Key urban form parameters—including open-space ratios, building orientation, canyon aspect ratios, and building distribution—were varied to evaluate their effects on façade-level solar radiation. Statistical analyses established robust correlations between morphology and solar mitigation outcomes.
Findings demonstrate that urban morphology is a decisive determinant of environmental performance. East-West linear layouts reduced annual façade solar irradiation by up to 29%, while compact, vegetated U-shaped clusters achieved reductions of up to 48%. Based on established correlations reported in the literature, these solar reductions correspond to estimated cooling energy savings of 23–32% and significant improvements in outdoor thermal comfort. Furthermore, by lowering ambient thermal loads, these passive strategies enhance the operational efficiency and feasibility of photovoltaic (PV) systems, positioning urban layout as a dual passive-active sustainability lever.
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References
[1] Singh K, Hachem-Vermette C, D’Almeida R. Solar neighborhoods: the impact of urban layout on a large-scale solar strategies application. Sci Rep. 2023; 13: 43348. https://doi.org/10.1038/s41598-023-43348-8
[2] Stracqualursi A. Climate adaptivity of urban form: an evaluation by the case study of Medina of Fès. J Build Perform Simul. 2023; 18(3-4): 351-70. https://doi.org/10.1080/19401493.2023.2251935
[3] Alfouly M, Halilovic S, Hamacher T. Evaluating urban form influence on solar exposure and corresponding building energy demands. Energy Build. 2025; 338: 115708. https://doi.org/10.1016/j.enbuild.2025.115708
[4] Fang Y, Liu Z, Jia Y, Ke M, Yang R, Cai Y, et al. Impact of urban block morphology on solar availability in severe cold high-density cities: a case study of residential blocks in Harbin. Land. 2025; 14(3): 581. https://doi.org/10.3390/land14030581
[5] Camporeale PE, Mercader-Moyano MP. Retrofit strategies to mitigate overheating linking urban climate modeling and urban building simulations with outdoor comfort. An urban sector in Malaga (Spain). Energy Build. 2023; 298: 113531. https://doi.org/10.1016/j.enbuild.2023.113531
[6] Liu K, Xu X, Zhang R, Kong L, Wang W, Deng W, et al. Impact of urban form on building energy consumption and solar energy potential: A case study of residential blocks in Jianhu, China. Energy Build. 2023; 280: 112727. https://doi.org/10.1016/j.enbuild.2022.112727
[7] Natanian J. Optimizing mixed-use district designs in hot climates: A two-phase computational workflow for energy balance and environmental performance. Sustain Cities Soc. 2023; 98: 104800. https://doi.org/10.1016/j.scs.2023.104800
[8] Rostami E, Nasrollahi N, Khodakarami J. A comprehensive study of how urban morphological parameters impact the solar potential, energy consumption and daylight autonomy in canyons and buildings. Energy Build. 2024; 305: 113904. https://doi.org/10.1016/j.enbuild.2024.113904
[9] deRoos J. Planning and programming a hotel. Ithaca (NY): Cornell University, School of Hotel Administration; 2011. Working paper.
[10] Uzezi BO. Creating a sense of spatial harmony through organic architecture (thesis). Awka: Nnamdi Azikiwe University; 2013.
[11] Yilmaz S, Mutlu E, Efe R. The effect of landscape elements on urban microclimate in coastal cities. Fresenius Environ Bull. 2020; 29(10): 8394-402.
[12] Shashua-Bar L, Hoffman ME. Vegetation as a climatic component in the design of an urban street: An empirical model for predicting the cooling effect of urban green areas with trees. Energy Build. 2000; 31(3): 221-35. https://doi.org/10.1016/S0378-7788(99)00018-3
[13] Gong FY, Zeng ZC, Zhang F, Li X, Ng E, Norford LK. Mapping sky, tree, and building view factors of street canyons in a high-density urban environment. Build Environ. 2018; 134: 155-67. https://doi.org/10.1016/j.buildenv.2018.02.042
[14] Bromberek Z. Eco-resorts: Planning and Design for the Tropics. Abingdon: Routledge; 2009.
[15] Barazesh S. Suggestions for designing sustainable touristic resort complexes: With emphasis on static cooling in hot and dry climates (dissertation). Famagusta: Eastern Mediterranean University; 2011.
[16] Shishegar N. Street design and urban microclimate: Analyzing the effects of street geometry and orientation on airflow and solar access in urban canyons. J Clean Energy Technol. 2013; 1(1): 52-6. https://doi.org/10.7763/JOCET.2013.V1.13
[17] Sanaieian H, Tenpierik M, van den Linden K, Seraj F, Shemrani SMM. Review of the impact of urban block form on thermal performance, solar access and ventilation. Renew Sustain Energy Rev. 2014; 38: 551-60. https://doi.org/10.1016/j.rser.2014.06.007
[18] Lodhi MK, Tan Y, Wang X, Suprijanto A, Imran M. Advancing urban solar assessment: A deep learning and atmospheric modelling framework for quantifying PV yield and carbon reduction. Energy Build. 2025; 338: 115717. https://doi.org/10.1016/j.enbuild.2025.115717
[19] Ben Hamouche M. Climate, cities and sustainability in the Arabian region: Compactness as a new paradigm in urban design and planning. Archnet-IJAR. 2008; 2(3): 196-208.
[20] Huang Y, Yang Y, Ren H, Ye L, Liu Q. From Urban Design to Energy Sustainability: How Urban Morphology Influences Photovoltaic System Performance. Sustainability. 2024; 16(16): 7193. https://doi.org/10.3390/su16167193
[21] Merolli J, Dervishi S. Analyzing the impact of urban morphology on solar potential for photovoltaic panels: A comparative study across various European climates. Sustain Cities Soc. 2024; 115: 105854. https://doi.org/10.1016/j.scs.2024.105854
[22] Du L, Wang H, Bian C, Chen X. Impact of block form on building energy consumption, urban microclimate and solar potential: A case study of Wuhan, China. Energy Build. 2025; 328: 115224. https://doi.org/10.1016/j.enbuild.2024.115224
[23] Chatzipoulka C, Compagnon R, Nikolopoulou M. Urban geometry and solar availability on façades and ground of real urban forms: Using London as a case study. Sol Energy. 2016; 138: 53-66. https://doi.org/10.1016/j.solener.2016.09.005
[24] Alpar S, Berger J, Mazuroski W, Belarbi R. Shape optimization of the energy efficiency of building retrofitted façade. Sol Energy. 2024; 271: 112437. https://doi.org/10.1016/j.solener.2024.112437
[25] Asfour O, Alshawaf E. Effect of housing density on energy efficiency of buildings located in hot climates. Energy Build. 2015; 91: 131-8. https://doi.org/10.1016/j.enbuild.2015.01.044
[26] Gracik S, Heidarinejad M, Liu J, Srebric J. Effect of urban neighborhoods on the performance of building cooling systems. Build Environ. 2015; 90: 15-29. https://doi.org/10.1016/j.buildenv.2015.02.037
[27] Mohajeri N, Upadhyay G, Gudmundsson A, Assouline D, Kämpf J, Scartezzini J. Effects of urban compactness on solar energy potential. Renew Energy. 2016; 93: 469-82. https://doi.org/10.1016/j.renene.2016.02.053
[28] Lima I, Scalco V, Lamberts R. Estimating the impact of urban densification on high-rise office building cooling loads in a hot and humid climate. Energy Build. 2019; 182: 30-44. https://doi.org/10.1016/j.enbuild.2018.10.023
[29] Apreda C, Reder A, Mercogliano P. Urban morphology parameterization for assessing the effects of housing blocks layouts on air temperature in the Euro-Mediterranean context. Energy Build. 2020; 223: 110171. https://doi.org/10.1016/j.enbuild.2020.110171
[30] Li J, Wang Y, Xia Y. A novel geometric parameter to evaluate the effects of block form on solar radiation towards sustainable urban design. Sustain Cities Soc. 2022; 84: 104001. https://doi.org/10.1016/j.scs.2022.104001
[31] Busato L. Passive cooling and energy efficient strategies for design of hotel on the southern coast of pernambuco (thesis). London: London Metropolitan University; 2003.
[32] Bayoumi A. Comparative wind simulation studies of different urban patterns in hot arid region: Touristic resort at Qarun Lake, Fayoum Region – Egypt. Energy Sci Technol. 2013; 5(2): 38-44.
[33] Prayitno B. An analysis on spatial permeability and fluid dynamics of wind and thermal in tropical riverside residential areas of Banjarmasin City, Indonesia. Jurnal Manusia dan Lingkungan. 2013; 20(2): 199-212.
[34] Allegrini J. Influence of morphologies on the microclimate in urban neighborhoods. J Wind Eng Ind Aerodyn. 2015; 144: 108-17. https://doi.org/10.1016/j.jweia.2015.01.013
[35] Padilla-Marcos MÁ, Feijó-Muñoz J, Meiss A. Wind velocity effects on the quality and efficiency of ventilation in the modelling of outdoor spaces. Case studies. Build Serv Eng Res Technol. 2016; 37(1): 33-50. https://doi.org/10.1177/0143624415596441
[36] Okeil A. A holistic approach to energy efficient building forms. Energy Build. 2010; 42(9): 1437-44. https://doi.org/10.1016/j.enbuild.2010.03.013
[37] El-Deeb K, El-Zafarany A, Sheriff AA. Effect of building form and urban pattern on energy consumption of residential buildings in different desert climate. In: Proceedings of the 28th International Conference on Passive and Low Energy Architecture (PLEA 2012); 2012. p. 1-6.
[38] Van Esch MME, Looman RHJ, de Bruin-Hordijk GJ. The effects of urban and building design parameters on solar access to the urban canyon and the potential for direct passive solar heating strategies. Energy Build. 2012; 47: 189-200. https://doi.org/10.1016/j.enbuild.2011.11.042
[39] Sanaieian H, Seraj F, Mohammad S, Lahijani M. Placement of semi-enclosed spaces and energy demand. In: Proceedings of the 29th International Conference on Passive and Low Energy Architecture (PLEA 2013); 2013. p. 1-6.
[40] Van NT. Optimization for passive design of large scale housing projects for energy and thermal comfort in a hot and humid climate. In: Proceedings of the 30th International Conference on Passive and Low Energy Architecture (PLEA 2014); 2014. p. 52-8.
[41] Da-long L, Hui-hui Z, Jia-ping L. Rule of long-wave radiation in enclosed building space. Energy Build. 2019; 182: 311-21. https://doi.org/10.1016/j.enbuild.2018.10.035
[42] Omran ESE, Gaber IM, Elkashef TM. Climate considerations in the planning and sustainability of Egyptian cities. In: Egypt’s Strategy to Meet the Sustainable Development Goals and Agenda 2030: Researchers' Contributions. Cham: Springer; 2023. p. 207-38. https://doi.org/10.1007/978-3-031-10676-7_9
[43] Toudert FA, Mayer H. Effects of street design on outdoor thermal comfort. 2007. Available from: http://www.sci.u-szeged.hu/eghajlattan/magyar.html (accessed 13 March 2025).
[44] Hanna MS. The tourism crisis in post January 25th Egypt (thesis). Cairo: American University in Cairo; 2013.
[45] Mirzabeigi S, Razkenari M. Design optimization of urban typologies: A framework for evaluating building energy performance and outdoor thermal comfort. Sustain Cities Soc. 2022; 76: 103515. https://doi.org/10.1016/j.scs.2021.103515
[46] Štahan K. Energy-efficient architecture and sustainable urban tourism: Context, challenges and solution. In: Sustainable Tourism - Practices and Awareness. London: IntechOpen; 2018. p. 1-21. https://doi.org/10.5772/intechopen.72385
[47] Zander KK, Shalley F, Taylor A, Tan G, Dyrting S. Run air-conditioning all day: Adaptation pathways to increasing heat in the Northern Territory of Australia. Sustain Cities Soc. 2021; 74: 103194. https://doi.org/10.1016/j.scs.2021.103194
[48] Luo H, Cao S, Lu VL. The techno-economic feasibility of a coastal zero-energy hotel building supported by the hybrid wind–wave energy system. Sustain Energy Grids Netw. 2022; 30: 100650. https://doi.org/10.1016/j.segan.2022.100650
[49] Raihan A, Ibrahim S, Muhtasim DA. Dynamic impacts of economic growth, energy use, tourism, and agricultural productivity on carbon dioxide emissions in Egypt. World Dev Sustain. 2023; 2: 100059. https://doi.org/10.1016/j.wds.2023.100059
[50] Mussawar O, Mayyas A, Azar E. Built form and function as determinants of urban energy performance: An integrated agent-based modeling approach and case study. Sustain Cities Soc. 2023; 96: 104660. https://doi.org/10.1016/j.scs.2023.104660
[51] Ibrahim Z. Tourism development and the environment on the Egyptian red sea coast [Master's thesis]. Waterloo: University of Waterloo; 2009.
[52] Anthopoulos L, Kazantzi V. Urban energy efficiency assessment models from an AI and big data perspective: Tools for policy makers. Sustain Cities Soc. 2022; 76: 103492. https://doi.org/10.1016/j.scs.2021.103492
[53] Ibrahim T, Akrouch M, Hachem F, Ramadan M, Ramadan H, Khaled M, et al. Cooling techniques for enhanced efficiency of photovoltaic panels- Comparative analysis with environmental and economic insights. Energies. 2024; 17(3): 713. https://doi.org/10.3390/en17030713
[54] Al-Masalha I, Alsabagh A, Badran O, Alkawaldeh N, Abu-Rahmeh T, Al Alawin A, et al. Improving photovoltaic module efficiency using water sprinklers, air fans, and combined cooling systems. EPJ Photovolt. 2024; 15: 41. https://doi.org/10.1051/epjpv/2024037
[55] Tahir M, Dong X, Khan M, Ur Rehman I. Thermal management of solar systems: A comprehensive review of cooling methods. Sol Energy. 2025; 299: 113811. https://doi.org/10.1016/j.solener.2025.113811
[56] Zhao K, Gou Z. Influence of urban morphology on facade solar potential in mixed-use neighborhoods: Block prototypes and design benchmark. Energy Build. 2023; 297: 113446. https://doi.org/10.1016/j.enbuild.2023.113446
[57] Muhaisen A, Gadi MB. Mathematical model for calculating the shaded and sunlit areas in a circular courtyard geometry. Build Environ. 2005; 40(12): 1619-25. https://doi.org/10.1016/j.buildenv.2004.12.008
[58] Yahia MW, Johansson E. Influence of urban planning regulations on the microclimate in a hot dry climate: The example of Damascus, Syria. J Hous Built Environ. 2013; 28(1): 51-65. https://doi.org/10.1007/s10901-012-9283-8
[59] Taleghani M, Sailor D, Ban-Weiss GA. Micrometeorological simulations to predict the impacts of heat mitigation strategies on pedestrian thermal comfort in a Los Angeles neighborhood. Environ Res Lett. 2016; 11(2): 024003. https://doi.org/10.1088/1748-9326/11/2/024003
[60] Yas E, Vildan OK. Evaluation of the effects of courtyard building shapes on solar heat gains and energy efficiency according to different climatic regions. Energy Build. 2014; 73: 192-9. https://doi.org/10.1016/j.enbuild.2014.01.035
[61] Ai ZT, Mak CM. From street canyon microclimate to indoor environmental quality in naturally ventilated urban buildings: Issues and possibilities for improvement. Build Environ. 2015; 94: 489-503. https://doi.org/10.1016/j.buildenv.2015.05.030
[62] St Clair P. Low-energy design in the United Arab Emirates – Building design principles. The Environmental Design Guide. 2009:1-10.
[63] Martins TAD, Adolphe L, Krause C. Microclimate effects of urban geometry on outdoor thermal comfort in the Brazilian tropical semi-arid climate. In: Proceedings of the 28th International Conference on Passive and Low Energy Architecture (PLEA 2012); 2012. p. 1-7.
[64] El Dallal N, Visser F. A climate responsive urban design tool: A platform to improve energy efficiency in a dry hot climate. Int J Sustain Energy. 2017; 36(8): 738-53. https://doi.org/10.1080/14786451.2015.1118557
[65] Ouali K, El Harrouni K, Abidi ML, Diab Y. Analysis of open urban design as a tool for pedestrian thermal comfort enhancement in Moroccan climate. J Build Eng. 2020; 28: 101042. https://doi.org/10.1016/j.jobe.2019.101042
[66] Abd Elraouf R, Elmokadem A, Megahed N, Eleinen OA, Eltarabily S. The impact of urban geometry on outdoor thermal comfort in a hot-humid climate. Build Environ. 2022; 225: 109632. https://doi.org/10.1016/j.buildenv.2022.109632
[67] Alotaibi S, Nazari MA. District cooling in the Middle East & North Africa; history, current status, and future opportunities. J Build Eng. 2023; 77: 107522. https://doi.org/10.1016/j.jobe.2023.107522
[68] Nault E, Peronato G, Rey E, Andersen M. Review and critical analysis of early-design phase evaluation metrics for the solar potential of neighborhood designs. Build Environ. 2015; 92: 679-91. https://doi.org/10.1016/j.buildenv.2015.05.020
[69] De la Paz Pérez GA, Couret DG, Rodríguez-Algeciras JA, De la Paz Vento G. Influence of the urban context on solar protection of the vertical envelope and the cooling energy demand of buildings in Cuba. J Build Eng. 2023; 76: 107224. https://doi.org/10.1016/j.jobe.2023.107224
[70] Yang F, Qian F, Lau SSY. Urban design to lower summertime outdoor temperatures: An empirical study on high-rise housing in Shanghai. Build Environ. 2011; 46(3): 769-85. https://doi.org/10.1016/j.buildenv.2010.10.010
[71] Abed H. Effect of building form on the thermal performance of residential complexes in the Mediterranean climate of the Gaza Strip (thesis). Gaza: Islamic University of Gaza; 2012.
[72] Muhaisen A, Abed H. Effect of urban geometry and spacing on the thermal performance in the Mediterranean climate of the Gaza Strip. J Archit Plan. 2014; 26: 1-14.
[73] Sadique J, Yang XIA, Meneveau C, Mittal R. Aerodynamic properties of rough surfaces with high aspect-ratio roughness elements: Effect of aspect ratio and arrangements. Boundary-Layer Meteorol. 2017; 163(2): 203-24. https://doi.org/10.1007/s10546-016-0222-1
[74] Middel A, Häb K, Brazel AJ, Martin CA, Guhathakurta S. Impact of urban form and design on mid-afternoon microclimate in Phoenix Local Climate Zones. Landsc Urban Plan. 2014; 122: 16-28. https://doi.org/10.1016/j.landurbplan.2013.11.004
[75] Ouria M, Sevinc H. Evaluation of the potential of solar energy utilization in Famagusta, Cyprus. Sustain Cities Soc. 2018; 37: 189-202. https://doi.org/10.1016/j.scs.2017.11.011
[76] Muhaisen A, Gadi MB. Shading performance of polygonal courtyard forms. Build Environ. 2006; 41(8): 1050-9. https://doi.org/10.1016/j.buildenv.2005.04.023
[77] El-Deeb K, Sherif A, El-Zafarany A. Effect of courtyard height and proportions on energy performance of multi-storey air-conditioned desert buildings. In: Proceedings of the 30th International Conference on Passive and Low Energy Architecture (PLEA 2014); 2014. p. 1-8.
[78] Amado M, Poggi F, Amado AR. Energy efficient city: A model for urban planning. Sustain Cities Soc. 2016; 26: 476-85. https://doi.org/10.1016/j.scs.2016.06.022
[79] Das S, Day C, Hauck J, Haymaker J, Davis D. Space plan generator: Rapid generation & evaluation of floor plan design options to inform decision making. In: Proceedings of the 2016 Symposium on Simulation for Architecture and Urban Design; 2016. p. 1-8.
[80] Natanian J, Aleksandrowicz O, Auer T. A parametric approach to optimizing urban form, energy balance and environmental quality: The case of Mediterranean districts. Appl Energy. 2019; 254: 113637. https://doi.org/10.1016/j.apenergy.2019.113637
[81] Natanian J, Auer T. Beyond nearly zero energy urban design: A holistic microclimatic energy and environmental quality evaluation workflow. Sustain Cities Soc. 2020; 56: 102094. https://doi.org/10.1016/j.scs.2020.102094
[82] MeshkinKiya M, Paolini R. Uncertainty of solar radiation in urban canyons propagates to indoor thermo-visual comfort. Sol Energy. 2021; 221: 545-58. https://doi.org/10.1016/j.solener.2021.04.033
[83] Wang W, Liu K, Zhang M, Shen Y, Jing R, Xu X, et al. From simulation to data-driven approach: A framework of integrating urban morphology to low-energy urban design. Renew Energy. 2021; 179: 2016-35. https://doi.org/10.1016/j.renene.2021.08.036
[84] Bernal M, Haymaker JR, Eastman C. On the role of computational support for designers in action. Des Stud. 2015; 41: 163-82. https://doi.org/10.1016/j.destud.2015.08.001
[85] Lin P, Gou Z, Lau SSY, Qin H. The impact of urban design descriptors on outdoor thermal environment: A literature review. Energies. 2017; 10(12): 2151. https://doi.org/10.3390/en10122151
[86] Rezaee R, Brown J, Augenbroe G, Haymaker J. The application of inverse approach to the early stage of performance-based building design. In: Proceedings of the 14th Conference of International Building Performance Simulation Association; 2015. p. 1801-8.
[87] Isik E, Achten G. Can we use digital twin technology in the design process? A theoretical framework. In: ArchDesign '22: Proceedings of the 9th International Conference on Architecture and Design; 2022. p. 45-52.
[88] Cross N, Roozenburg N. Modeling the design process in engineering and in architecture. J Eng Des. 1992; 3(4): 325-37. https://doi.org/10.1080/09544829208914765
[89] Central Agency for Public Mobilization and Statistics (CAPMAS). Statistical Yearbook. Egypt: CAPMAS; 2016.
[90] Bahgat R, Reffat RM, Elkady SL. Analyzing the impact of design configurations of urban features on reducing solar radiation. J Build Eng. 2020; 32: 101664. https://doi.org/10.1016/j.jobe.2020.101664
[91] Azar S. TownScope 3 software: Description. 2018. Available from: http://www.townscope.com/index.php (accessed 13 March 2025).
[92] Heliodon. 2024. Available from: http://heliodon.net/heliodon/index.html (accessed 13 March 2025).
[93] United Nations Human Settlements Programme (UN-Habitat). World Cities Report 2020: The Value of Sustainable Urbanization. 2021. Available from: https://unhabitat.org/world-cities-report (accessed 13 March 2025).
[94] Mahmoud AH. Analysis of thermal comfort conditions in an outdoor urban setting: The case of Cairo, Egypt. Build Environ. 2011; 46(5): 605-15. https://doi.org/10.1016/j.buildenv.2010.09.009
[95] Kim Y, Kim Y. Energy and daylighting analysis of automated dynamic shading systems in buildings. Build Environ. 2020; 169: 106543. https://doi.org/10.1016/j.buildenv.2019.106543
[96] Haggag M, Hassan A. Experimental study on the performance of passive cooling techniques in residential buildings at arid climate. Renew Energy. 2015; 83: 232-44. https://doi.org/10.1016/j.renene.2015.04.044
[97] Mahmoud SH, Gan TY. Long-term impact of rapid urbanization on urban climate and human thermal comfort in hot-arid environment. Build Environ. 2018; 142: 83-100. https://doi.org/10.1016/j.buildenv.2018.06.022
[98] Kim J, Park C, Lee J. Integration of PV systems on vertical facades: Performance analysis in hot and arid environments. Renew Energy. 2022; 187: 185-98. https://doi.org/10.1016/j.renene.2022.01.017
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