Thermal comfort conditions of shaded outdoor spaces in hot and humid climate of Malaysia

Abstract In recent years, the accelerated rate of urban growth in tropical cities highlights the critical necessity of creating more outdoor spaces for leisure and recreation activities of citizens. Nevertheless, the thermal conditions and the thermal sensation of users have not been fully explored in outdoor environments of hot and humid climate. This fact elucidates the need for considering human thermal comfort in outdoor spaces with such climates. Consequently, in this research, a quantitative field study was applied to investigate outdoor thermal comfort conditions in hot and humid tropical climate of Malaysia. Thermal conditions of outdoor spaces were evaluated based upon the measurement of major climatic parameters, while the thermal perception of subjects was captured simultaneously using a questionnaire survey. The study concentrated on the shaded outdoor spaces within the campus of Universiti Putra Malaysia whereas the focus was on the students of university including local and international individuals as the respondents of inquiry. Meanwhile, the Physiologically Equivalent Temperature (PET) thermal comfort index was utilized to assess the thermal comfort conditions of selected areas. Results from this study indicated besides the substantial role of environmental factors, thermal adaptation and psychological parameters strongly affect human thermal comfort level in outdoor spaces. Moreover, this study represents that there is a significant difference between the responses of the local and the international subjects regarding the climatic conditions. The final outcome of the study contributes toward creating comfortable outdoor spaces in hot and humid contexts to enhance the quality of outdoor life in cities.

[1]  Erik Johansson,et al.  The influence of urban design on outdoor thermal comfort in the hot, humid city of Colombo, Sri Lanka , 2006, International journal of biometeorology.

[2]  L. Berglund,et al.  A standard predictive index of human response to the thermal environment , 1986 .

[3]  H. Mayer,et al.  Modelling radiation fluxes in simple and complex environments—application of the RayMan model , 2007, International journal of biometeorology.

[4]  Khandaker Shabbir Ahmed.  Comfort in urban spaces: defining the boundaries of outdoor thermal comfort for the tropical urban environments , 2003 .

[5]  H. Andrade,et al.  An initial assessment of the bioclimatic comfort in an outdoor public space in Lisbon , 2007, International journal of biometeorology.

[6]  Helmut Mayer,et al.  Human thermal comfort in summer within an urban street canyon in Central Europe , 2008 .

[7]  V. Muggeo,et al.  The effect of birthplace on heat tolerance and mortality in Milan, Italy, 1980–1989 , 2006, International journal of biometeorology.

[8]  F. Lindberg,et al.  Different methods for estimating the mean radiant temperature in an outdoor urban setting , 2007 .

[9]  Tzu-Ping Lin,et al.  Tourism climate and thermal comfort in Sun Moon Lake, Taiwan , 2008, International journal of biometeorology.

[10]  M. Nikolopoulou,et al.  Use of outdoor spaces and microclimate in a Mediterranean urban area , 2007 .

[11]  P. Höppe,et al.  The physiological equivalent temperature – a universal index for the biometeorological assessment of the thermal environment , 1999, International journal of biometeorology.

[12]  Koen Steemers,et al.  Thermal comfort in outdoor urban spaces: understanding the human parameter , 2001 .

[13]  Andreas Matzarakis,et al.  Tourism climate information based on human thermal perception in Taiwan and Eastern China , 2011 .

[14]  Tzu-Ping Lin,et al.  Thermal perception, adaptation and attendance in a public square in hot and humid regions , 2009 .

[15]  Nicole Metje,et al.  Pedestrian comfort using clothing values and body temperatures , 2008 .

[16]  I. Knez,et al.  Influences of culture and environmental attitude on thermal, emotional and perceptual evaluations of a public square , 2006, International journal of biometeorology.

[17]  Robert Ho,et al.  Handbook of Univariate and Multivariate Data Analysis and Interpretation with SPSS , 2006 .

[18]  R. Dear,et al.  An outdoor thermal comfort index (OUT_SET^*) : Part I-The model and its assumptions , 1999 .

[19]  P. Jones,et al.  Field Measurement and Subjects' Votes Assessment on Thermal Comfort in High-rise Hostels in Malaysia , 2008 .

[20]  T. Honjo,et al.  Thermal Comfort and Outdoor Activity in Japanese Urban Public Places , 2007 .

[21]  K. Steemers,et al.  Thermal comfort and psychological adaptation as a guide for designing urban spaces , 2003 .

[22]  T. Stathopoulos,et al.  Outdoor human comfort in an urban climate , 2004 .

[23]  Tzu-Ping Lin,et al.  Shading effect on long-term outdoor thermal comfort , 2010 .

[24]  Standard Ashrae.  Thermal Environmental Conditions for Human Occupancy , 1992 .

[25]  Fazia Ali-Toudert,et al.  Effects of asymmetry, galleries, overhanging façades and vegetation on thermal comfort in urban street canyons , 2007 .

[26]  Richard de Dear,et al.  A field study of thermal comfort in outdoor and semi-outdoor environments in subtropical Sydney Australia , 2003 .