Predicting thermal comfort in office buildings in a Brazilian temperate and humid climate

Abstract This paper aims to compare thermal comfort responses from office workers in both fully air-conditioned and mixed-mode buildings against both the analytical and adaptive models of thermal comfort of ASHRAE 55-2013. Occupants were asked to record their thermal perception in questionnaires delivered online while instantaneous instrumental measurements were taken in situ (air temperature, radiant temperature, air velocity and humidity). Three buildings were investigated in a temperate and humid climate, i.e., in Florianopolis, southern Brazil. Two buildings have mixed-mode operation and one building has central air-conditioning. Almost two thousand six hundred questionnaires were collected during field studies. Actual thermal sensation and acceptability votes were compared against two predictive models of thermal comfort: the analytical model and the adaptive model. The 80% and 90% acceptability limits of indoor operative temperature used in the adaptive model were calculated using the prevailing mean outdoor air temperature. The analytical model overestimated the cold sensation of users, mainly for natural ventilation mode, and did not properly predict the percentage of thermal dissatisfaction of users. The analytical model could be used only when air-conditioning is operating; and a wider range of indoor thermal conditions than recommended by ASHRAE 55-2013 is recommended to be adopted during air-conditioning operation. The application of the adaptive model seems to be inappropriate for fully air-conditioned buildings. This work was not conclusive about the use of the adaptive model when the air-conditioning is on in mixed-mode buildings due to few data collected in this mode of operation. Under natural ventilation operation in mixed-mode buildings, occupants adapted to temperature fluctuations as predicted by the adaptive model, however, occupants appear to be more tolerant to cool conditions. The adaptive model may be used in mixed-mode buildings, when the air-conditioning is not on.

[1]  K. F. Fong,et al.  Comfort Zone of Air Speeds and Temperatures for Air-conditioned Environment in the Subtropical Hong Kong , 2010 .

[2]  Nor Mariah Adam,et al.  Ventilation Parameters and Thermal Comfort of Naturally and Mechanically Ventilated Offices , 2009 .

[3]  Jeong Tai Kim,et al.  The Effect of Seasons and Prevailing Environments on Adaptive Comfort Temperatures in Open Plan Offices , 2012 .

[4]  Q. Ouyang,et al.  Field study of human thermal comfort and thermal adaptability during the summer and winter in Beijing , 2011 .

[5]  Sheikh Ahmad Zaki,et al.  Field study on adaptive thermal comfort in office buildings in Malaysia, Indonesia, Singapore, and Japan during hot and humid season , 2016 .

[6]  Sanyogita Manu,et al.  Field studies of thermal comfort across multiple climate zones for the subcontinent: India Model for Adaptive Comfort (IMAC) , 2016 .

[7]  Han-Hsi Liang,et al.  Additive model for thermal comfort generated by matrix experiment using orthogonal array , 2009 .

[8]  Cinzia Buratti,et al.  Thermal comfort in open plan offices in northern Italy: An adaptive approach , 2012 .

[9]  Hugo S. L. C. Hens,et al.  Thermal comfort in office buildings: Two case studies commented , 2009 .

[10]  Wouter D. van Marken Lichtenbelt,et al.  Energy consumption in buildings and female thermal demand , 2015 .

[11]  Roberto Lamberts,et al.  A review of human thermal comfort in the built environment , 2015 .

[12]  Ryozo Ooka,et al.  Field investigation of comfort temperature in Indian office buildings: A case of Chennai and Hyderabad , 2013 .

[13]  Hom B. Rijal,et al.  Understanding occupant behaviour: the use of controls in mixed-mode office buildings , 2009 .

[14]  J. F. Nicol,et al.  The validity of ISO-PMV for predicting comfort votes in every-day thermal environments , 2002 .

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

[16]  van J Joost Hoof,et al.  Forty years of Fanger’s model of thermal comfort: comfort for all? , 2008 .

[17]  Kamaruzzaman Sopian,et al.  Effective Ventilation Parameters and Thermal Comfort Study of Air-conditioned Offices , 2009 .

[18]  S. Karjalainen,et al.  Thermal comfort and gender: a literature review. , 2012, Indoor air.

[19]  Yingxin Zhu,et al.  Evaluating thermal comfort in mixed-mode buildings: A field study in a subtropical climate , 2015 .

[20]  K. Mui,et al.  Neutral temperature in subtropical climates—A field survey in air-conditioned offices , 2007 .

[21]  Ryozo Ooka,et al.  Adaptive model of thermal comfort for offices in hot and humid climates of India , 2014 .

[22]  Ricardo Forgiarini Rupp,et al.  Potencial de economia de energia elétrica em edificações comerciais híbridas localizadas em Florianópolis, SC , 2013 .

[23]  P. O. Fanger,et al.  Thermal comfort: analysis and applications in environmental engineering, , 1972 .

[24]  Maohui Luo,et al.  The dynamics of thermal comfort expectations: The problem, challenge and impication , 2016 .

[25]  W D van Marken Lichtenbelt,et al.  Differences between young adults and elderly in thermal comfort, productivity, and thermal physiology in response to a moderate temperature drift and a steady-state condition. , 2010, Indoor air.

[26]  Gail Brager,et al.  Developing an adaptive model of thermal comfort and preference , 1998 .

[27]  Ricardo Forgiarini Rupp,et al.  What is the most adequate method to assess thermal comfort in hybrid commercial buildings located in hot-humid summer climate? , 2014 .

[28]  Richard de Dear,et al.  Mixed-mode buildings: A double standard in occupants’ comfort expectations , 2012 .