A New Approach to Evaluate Various Thermal Environments

Predicted mean vote (PMV) has been recognized as one internationally adopted measurement criterion of thermal comfort. It has been applied in an air-conditioned environment but may be less applicable to naturally ventilated (NV) buildings. In this study, a new approach was developed to evaluate the impact of thermal environment on human comfort. An effective algorithm has been devised to enable a selection of the steady physiological response most appropriate in a required situation. Three physiological parameters—mean skin temperature, skin wettedness, and skin evaporative heat loss—are computed for correlation with the actual thermal comfort vote based on published data. With previous research findings, the correlation is derived in an expert system. Human thermal adaptation, which is overlooked in PMV but actually affects thermal comfort in NV environments, has been incorporated. This approach may offer a more accurate estimation of values of thermal mean vote, especially when the evaporative heat loss is used in the evaluation. In the study, the estimation error in NV buildings was reduced by 61%, leading to a better prediction of thermal acceptability. As a conclusion, this approach may yield a better evaluation of the thermal environment than the conventional PMV in NV buildings.

[1]  J. F. Nicol,et al.  Climatic variations in comfortable temperatures: the Pakistan projects , 1999 .

[2]  Elias M. Awad.  Building Expert Systems: Principles, Procedures, and Applications , 1996 .

[3]  L. Berglund,et al.  Parameters of human discomfort in warm environments , 1986 .

[4]  P. Fanger.  Calculation of Thermal Comfort, Introduction of a Basic Comfort Equation , 1967 .

[5]  R. Dear,et al.  Thermal adaptation in the built environment: a literature review , 1998 .

[6]  Mark Standeven,et al.  Thermal comfort for free-running buildings , 1996 .

[7]  N. Wong,et al.  Thermal comfort for naturally ventilated houses in Indonesia , 2004 .

[8]  F. Nicol.  Adaptive thermal comfort standards in the hot–humid tropics , 2004 .

[9]  Lin Borong,et al.  Study on the thermal performance of the Chinese traditional vernacular dwellings in Summer , 2004 .

[10]  P. Fanger,et al.  Extension of the PMV model to non-air-conditioned buildings in warm climates , 2002 .

[11]  Michael A. Humphreys,et al.  ADAPTIVE THERMAL COMFORT AND SUSTAINABLE THERMAL STANDARDS FOR BUILDINGS , 2002 .

[12]  J. Busch.  A tale of two populations: thermal comfort in air-conditioned and naturally ventilated offices in Thailand , 1992 .

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

[14]  Nyuk Hien Wong,et al.  Adaptive behaviour and thermal comfort in Singapore's naturally ventilated housing , 2003 .

[15]  Ken Parsons,et al.  Human Thermal Environments: The Effects of Hot, Moderate, and Cold Environments on Human Health, Comfort and Performance, Second Edition , 2002 .

[16]  P. Höppe.  Indoor climate , 2005, Experientia.

[17]  A. H. Taki,et al.  An investigation into thermal comfort in the summer season of Ghadames, Libya , 2001 .

[18]  Refrigerating.  ASHRAE handbook of fundamentals , 1967 .

[19]  George Bojadziev,et al.  Fuzzy Sets, Fuzzy Logic, Applications , 1996, Advances in Fuzzy Systems - Applications and Theory.

[20]  Ken Parsons,et al.  Human Thermal Environments: The Effects of Hot, Moderate, and Cold Environments on Human Health, Comfort and Performance , 1999 .

[21]  Mark Stefik,et al.  Introduction to knowledge systems , 1995 .

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

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

[24]  A. P. Gagge,et al.  An Effective Temperature Scale Based on a Simple Model of Human Physiological Regulatiry Response , 1972 .

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

[26]  L. Berglund,et al.  Indices of thermoregulatory strain for moderate exercise in the heat. , 1978, Journal of applied physiology: respiratory, environmental and exercise physiology.