Perceived Thermal Environment of NaturallyVentilated Classrooms in India


  • Ramprasad Vittal Professor in the Department of Architecture, National Institute of Technology, Tiruchirappalli (NITT), Tamilnadu, India.
  • Subbaiyan Gnanasambandam Head of the Department of Architecture at the National Institute of Technology, Tiruchirappalli (NITT), Tamilnadu, India



Thermal environment, Adaptive thermal comfort, Classrooms, Adaptive opportunities, Field Study


A ield study of thermal environment in naturally ventilated classrooms was conducted in the Department of Architecture at the National Institute of Technology, Tiruchirappalli, India. The study included 176 architecture students and was conducted over ive days during the comparatively cool months of December and January. The results show that 82% of participants voted for ‘comfortable’ on the thermal sensation scale. Cross tabulation of thermal sensation and thermal preference shows that 50% of those who voted within the ‘neutral’ thermal sensation range preferred cooler temperatures and 43% wanted no change. Classroom temperature was acceptable to 85% of students and unacceptable to 15% of students. Perceived thermal sensation tends toward the cool side (mean -0.26). Regression analysis yielded a comfort zone (voting within -1 and +1) of 26.9–30.8 °C, with neutral temperature of 29.0 °C. Standard adaptive comfort models yielded lower temperature than ield indings.


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[1] ANSI/ASHRAE. (2010) Thermal environmental conditions for human occupancy. Atlanta: ASHRAE (Standard 55-2010)
[2] ANSI/ASHRAE. (2013) Thermal environmental conditions for human occupancy. Atlanta: ASHRAE. (Standard 55-2013)
[3] BIS. (2005) National Building Code 2005. New Delhi: Bureau of Indian Standards.
[4] BURATTI, C., & RICCIARDI, P. (2009) Adaptive analysis of thermal comfort in university classrooms: Correlation between experimental data and mathematical models. Building and Environment. 44. p.674-687.
[5] BUSCH, J. (1990). Thermal responses to the Thai ofice environment. ASHRAE Transactions. 96(1). p.859-872.
[6] BUSCH, J. (1992). A tale of two populations: thermal comfort in air-conditioned and naturally ventilated ofice in Thailand. Energy and Buildings. 18. p.235-249.
[7] CEN (2007) Indoor environmental input parameters for design and assessment of energy performance of buildings addressing indoor air quality, thermal environment, lighting and acoustics. Brussels: Comité Européen de Normalisation.(Standard EN15251).
[8] DE DEAR, R. & BRAGER, G. (2002). Thermal comfort in naturally ventilated buildings: revisions to ASHRAE Standard 55. Energy and Buildings. 34. p. 549-561.
[9] FANGER, P.O. (1970). Thermal comfort. Analysis and applications in environmental engineering. Copenhagen: Danish Technical Press.
[10] GRIFFITHS, I. (1990). Thermal comfort studies in buildings with passive solar features, ield studies. Report of the Commission of the European Community. UK:ENS35 090.-
[11] HOYT, T., SCHIAVON, S., PICCIOLI, A., MOON, D., STEINFELD, K.( 2013). CBE Thermal Comfort Tool. Center for the Built Environment, University of California Berkeley. Available from: [Accessed: March 06, 2015].
[12] HUMPHREYS, M. & NICOL, J. (2002) The validity of ISO-PMV for predicting comfort votes in every-day thermal environments. Energy and Buildings. 34(6). p. 667-684.
[13] HUMPHREYS, M.A., RIJAL, H.B., NICOL, J.F. (2010) Examining and developing the adaptive relation between climate and thermal comfort indoors. In Proceedings of conference on adapting to change: new thinking on comfort. Cumberland Lodge, Windsor, UK, 9-11 April 2010. London: Network for Comfort and Energy Use in Buildings.
[14] HWANG, R.L., LIN, T.P., KUO, N.J. (2006) Field experiments on thermal comfort in campus classrooms in Taiwan. Energy and Buildings. 38(1). p. 53-62.
[15] INDRAGANTI, M. & RAO, K.D. (2010) Effect of age, gender, economic and tenure on thermal comfort: A ield study in residential buildings in hot and dry climate with seasonal variations. Building and Environment. 42. p. 273-281.
[16] INDRAGANTI, M. (2010) Thermal comfort in naturally ventilated apartments in summer: indings from a ield study in Hyderabad, India. Applied Energy. 87(3). p. 866-883.
[17] INDRAGANTI, M., OOKA, R., RIJAL, H. (2013) Thermal comfort in ofices in summer: indings from a ield study under the ‘setsuden’ conditions in Tokyo, Japan. Building and Environment. 61(3). p.114-132.
[18] INDRAGANTI, M., OOKA, R., RIJAL, H., BRAGER, G.S. (2014) Adaptive model of thermal comfort for ofices in hot and humid climates of India. Building and Environment. 74. p.39-53.
[19] ISO. (2005) ISO 7730: Ergonomics of the thermal environment e analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria. 3rd ed. Geneva: ISO
[20] JUNG, G.J., SONG, S.K., AHN, Y.C., OH, G.S., IM, Y.B. (2011) Experimental research on thermal comfort in the university classroom of regular semesters in Korea. Journal of Mechanical Science and Technology. 25(2). p. 503-551.
[21] KWOK, A.G. & CHUN, G. (2003) Thermal comfort in Japanese schools. Solar Energy. 74. p. 245-252
[22] LEDO, L., MA, Z., COOPER, P. (2012) Improving thermal comfort in naturally ventilated university buildings. In 12th Annual Australasian Campuses Towards Sustainability Conference 2012. p. 2-12.
[23] MCCARTNEY, K.J. & NICOL, J.F. (2002) Developing an adaptive control algorithm for Europe. Energy and Buildings. 34(6). p. 623-635.
[24] MISHRA, A.K. & RAMGOPAL, M. (2014 a) Thermal comfort in undergraduate laboratories - A ield study in Kharagpur, India, Building and Environment. 71. p.223-232.
[25] MISHRA, A.K. & RAMGOPAL, M. (2014 b) Thermal comfort ield study in undergraduate laboratories - An analysis of occupant perceptions, Building and Environment. 76. p. 62-72.
[26] MISHRA, A.K. & RAMGOPAL, M. (2014 c) Thermal comfort in classrooms in tropics: an analysis of student preference. In: Proceedings of Conference Eficient, High Performance Buildings For Developing Economies. ASHRAE




How to Cite

Ramprasad Vittal, & Subbaiyan Gnanasambandam. (2016). Perceived Thermal Environment of NaturallyVentilated Classrooms in India. Creative Space, 3(2), 149–165.