Document Type : Research Paper

Author

SRTTU

10.22061/jsaud.2021.6012.1597

Abstract

Traditional house yards in the desert cities of Iran play an important role in balancing and subtilizing the house's air. Its overall composition varies somewhat across Iran due to climatic and cultural reasons. Esfahan central courtyard houses also have a special combination. The main purpose of this paper is to investigate the process of central courtyard airflow (natural ventilation), influenced by the prevailing wind in late Qajar period houses in Isfahan (statistical population of research) and Labaf House as a random sample. The present study is an interdisciplinary research and uses a mixed method to conduct the research. In the first step (after selecting Labaf's house as a case study), using an empirical strategy, the independent variables were identified, and the dependent variables (velocity and direction of airflow) were measured by digital devices and smoke tests. The data were then analyzed using a simulation strategy. The simulations were performed by computational fluid dynamics (CFD) using Gambit and Fluent software. The results showed that in the statistical field the indoor air flow in the observer plane is opposite to the outside wind direction and in the northern third position (in the south north axis of the yard), an irregular eddy flow occurs and air is propagated to all locations of house, from this point.

Graphical Abstract

Investigation of air flow pattern in the central courtyard in Qajar houses of Isfahan by CFD method

Keywords

Main Subjects

ACGIH (2011) The Industrial Ventilation Manual. USA: The American Conference of Governmental Industrial Hygienists (ACGIH) Ltd.
Amidpoor, m. (2009) survey of the usage of no chimney heaters on indoor air quality, a research project, Khaje Nasir university, mechanic department: Iran’s consumption improvement co. [in Persian]
Bina, m. (2008) climatic analyzes of undergrounds in Dezful’s houses, Honaryhaye Ziba, no.33: 37-46 [in Persian]
Burgess, W. A. (1995) Recognition of Health Hazards in Industry. New York: Wiley Ltd.
Busch, J.F. (1992).  A tale of two populations: thermal comfort in air-conditioned and naturally ventilated offices in Thailand, Energy and Buildings 18 (3/4) 235–249.
Chlela, F., et al. (2009). A new methodology for the design of low energy buildings, Energy Build. 41 982–990.
Cheese wright, R. (1968) “turbulent natural convection from a vertical plane surface”, journal of heat transfer, Transaction of ASME: 1-9
Chen Q. (1995) Comparison of different k-ε models for indoor air flow computations. Numerical Heat Transfer, Part B Fundamentals.;28: 353-369.
Chen, Q. (1996) “Prediction of room air motion by Reynols-Stress models”, Building and Environment, No. 31: 233-244
Dafa Alla, A.A. and Bets, P.V. (1996) “Turbulent natural convection in a tall cavity”, Experimental heat transfer, No. 9: 165-194
Elder, J.W. (1965) Turbulence free convection in a vertical slot, J. Fluid Mech, report 23: 99-111
Energy Consumption Guide 19 (1993). Energy Efficiency in Offices, Energy Efficiency Office/HMSO, London
Energy Information Administration (1995). State Energy Data Report, 3–7 Tables.
Esfahan’s weather bureau (2015) Esfahan’s climatic profile, 50 years report of Esfahan station. [in Persian]
Fanaei, z. et al., (2011) comparative consideration and analyses of the plastering in Ghajarid houses of Esfahan, Naghsh Maye, No. 8, autumn: 43-56. [in Persian]
Finnegan, J.J., Pickering, C.A.C., Burge, P.S. (1994).  The sick building syndrome: prevalence studies, British Medical Journal 289. 1573–1575.
Ghasemi Sichani, m. (2008) recognition of a part of Iranian architectural identity by typological analyses of Esfahan houses in Ghajar era, PhD. thesis in architecture, Islamic Azad university of science and research. [in Persian]
Ghasemi Sichani, m. (2010), typology of Ghajarid Esfahan’s houses, Hoviat Shahr, No. 7, winter: 87-94. [in Persian]
Giel, p. w. and Schmidt, F. W. (1986) “all experiment study of high Rayleigh number natural convection”. In: an enclosure proceeding of the 8th International heat transfer conference, Vol. 4:1459-1464
Hassana. M.A, et al., (2007). Investigation of effects of window combinations on ventilation characteristics for thermal comfort in buildings. 209: 251–260
Heydari, a. et al., (2017) analyses of structure of traditional Iranian houses, Shahr-e-Irani Islami, No. 21, Summer: 21-33. [in Persian]
Jabalameli, a. (1996) Esfahan’s houses in contemporary era, congress of Iran’s historical architecture and urbanism, Arg-e-bam, Kerman, 4th volume. Tehran: Department of cultural heritage. [in Persian]
Karapetian, K. (1974), "Isfahan ،New Julfa: The Houses of the Armenians", Roma, Ismeo.
Kokh, nilson and hagger (2006) natural ventilation. Translated by Ahmadinejad, m. first publish. Esfahan: Nashr-e-Khak: 1. [in Persian]
Loomans, M. and Mook, F. van (1995) Survey on measuring indoor airflows FAGO, report 95.25.W., Eindhoven University of Technology Sweden.
Markatos, N.C. and Pericleous, K.A. (1984) “Laminar and turbulent natural convection in enclosed cavity”, Int. J. Heat mass transfer, Vol. 27, No. 5: 755-772
Memarian, G. (1993) getting acquaintance with Iranian domestic architecture, typology of introverted. Tehran: Science and Technology University ltd. [in Persian]
Mohtasham, a. et al (2014) technical consideration of plastering ornaments in Shahshahan house, developed technology and materials mag. No.2, summer: 37-49. [in Persian]
Momeni, K. (2018) comparative analogy of transparency in body and design of Ghajarid and Safavid houses of Esfahan, Islamic architecture researches mag. No. 18, spring: 23-41. [in Persian]
Nagano, Y., and Tagawa (1990) “An improved k-ε model for Boundary layer flows”, J. Fluid Engng Asme Trans, 112: 33-39
Nazeri, a. and Yazdanpanah, h. (2014) aesthetics values of ornaments of Akhavan house in Esfahan, No. 7, Summer: 53-76. [in Persian]
Olsen, D. A., Glicksman, L.R., and Ferm, H. M. (1990) “Steady state natural convection in an empty and partitioned enclosure at high Rayleigh numbers”, J. Heat Transfer, Trans. ASME 112: 640-647
Pedram, B. and Hariri, a. (2016) historical houses with a role more than a shelter in Esfahan, Pajoohesh-haye Memari Islami, No. 11, Summer: 92-74 [in Persian]
Rahaei, o. (2013) cultural identity and its effects on natural ventilation’s method in traditional Bazzar of Dezful, Bagh-e-Nazar, 2013:39-46. [in Persian]
Rahravi poode, s. et al. (2019) analyses of morphed characteristics of Chaharsoffe houses of Esfahan, Bagh-e-Nazar, Spring:5-20. [in Persian]
Rudy W. (1984) The Universities of Europe, 1100-1914: a history: Rutherford [NJ]: Fairleigh Dickinson University Press; London; Cranbury, NJ.
Salek, s. et al., (2012) comparative studies in Esfahan’s houses of Armenian and Moslem’s businessmen, No. 4, Autumn: 53-68. [in Persian]
Santelli, et al., (2001), "Maisons d Ispahan", Maisnneuve Larose.
Schlichting H, Truckenbrodt E. (1979) Aerodynamics of the Airplane: McGraw-Hill Companies
Shetabivash, H. (2015).  Investigation of opening position and shape on the natural cross ventilation. Energy and Buildings 93. 1–15
Soltanzade, h. (2011) the role of geography in formation of variety of traditional courtyards of Iran, Pajooheshhaye Geography-Ensani, No. 75. [in Persian]
Versteeg H, Malalasekera W. (1995) An introduction to computational fluid dynamics. Finite Volume Method, Essex, Longman Scientific & Technical.
Wilcox DC. (1998) Turbulence modeling for CFD: DCW industries La Canada, CA
Zhao, R., Xia, Y. (1998).  Effective non-isothermal and intermittent air movement on human thermal responses, Roomvent 2. 351–357.