The influence of local effects on thermal sensation under non-uniform environmental conditions — Gender differences in thermophysiology, thermal comfort and productivity during convective and radiant cooling

Applying high temperature cooling concepts, i.e. high temperature cooling (T(supply) is 16-20°C) HVAC systems, in the built environment allows the reduction in the use of (high quality) energy. However, application of high temperature cooling systems can result in whole body and local discomfort of the occupants. Non-uniform thermal conditions, which may occur due to application of high temperature cooling systems, can be responsible for discomfort. Contradictions in literature exist regarding the validity of the often used predicted mean vote (PMV) index for both genders, and the index is not intended for evaluating the discomfort due to non-uniform environmental conditions. In some cases, however, combinations of local and general discomfort factors, for example draught under warm conditions, may not be uncomfortable. The objective of this study was to investigate gender differences in thermophysiology, thermal comfort and productivity in response to thermal non-uniform environmental conditions. Twenty healthy subjects (10 males and 10 females, age 20-29 years) were exposed to two different experimental conditions: a convective cooling situation (CC) and a radiant cooling situation (RC). During the experiments physiological responses, thermal comfort and productivity were measured. The results show that under both experimental conditions the actual mean thermal sensation votes significantly differ from the PMV-index; the subjects are feeling colder than predicted. Furthermore, the females are more uncomfortable and dissatisfied compared to the males. For females, the local sensations and skin temperatures of the extremities have a significant influence on whole body thermal sensation and are therefore important to consider under non-uniform environmental conditions.

[1]  Hui Zhang,et al.  Partial- and whole-body thermal sensation and comfort— Part I: Uniform environmental conditions , 2006 .

[2]  Hein A.M. Daanen,et al.  Evaluation of wireless determination of skin temperature using iButtons , 2006, Physiology & Behavior.

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

[4]  Arjan Frijns,et al.  The thermoneutral zone: implications for metabolic studies. , 2012, Frontiers in bioscience.

[5]  Mia Ala-Juusela.  Heating and Cooling with Focus on Increased Energy Efficiency and Improved Comfort , 2004 .

[6]  Kazuyuki Kanosue,et al.  Thermal regulation and comfort during a mild-cold exposure in young Japanese women complaining of unusual coldness. , 2002, Journal of applied physiology.

[7]  Hui Zhang,et al.  Partial- and whole-body thermal sensation and comfort— Part I: Uniform environmental conditions , 2006 .

[8]  K. Dettwyler.  Anthropometric standardization reference manual, abridged edition. Edited by Timothy G. Lohman, Alex F. Roche, and Reynaldo Martoll. Champaign, Illinois: Human Kinetic Books. 1991. 90 pp. $16.00 (paper) , 1993 .

[9]  Donatien Njomo,et al.  Thermal comfort: A review paper , 2010 .

[10]  Chou-Ching K. Lin,et al.  Influence of age on thermal thresholds, thermal pain thresholds, and reaction time , 2010, Journal of Clinical Neuroscience.

[11]  Edward Arens,et al.  Thermal sensation and comfort models for non-uniform and transient environments: Part I: local sensation of individual body parts , 2009 .

[12]  Jlm Jan Hensen,et al.  Thermal comfort and older adults , 2006 .

[13]  B W Olesen,et al.  International standards for the indoor environment. , 2004, Indoor air.

[14]  J. van Hoof.  Forty years of Fanger's model of thermal comfort: comfort for all? , 2008, Indoor air.

[15]  James R. House,et al.  Using skin temperature gradients or skin heat flux measurements to determine thresholds of vasoconstriction and vasodilatation , 2002, European Journal of Applied Physiology.

[16]  J. Durnin,et al.  The assessment of the amount of fat in the human body from measurements of skinfold thickness , 1967, British Journal of Nutrition.

[17]  P. Fanger.  Assessment of man's thermal comfort in practice , 1973, British journal of industrial medicine.

[18]  Yutaka Tochihara,et al.  Gender differences in thermal comfort and mental performance at different vertical air temperatures , 2010, European Journal of Applied Physiology.

[19]  Mglc Marcel Loomans,et al.  The measurement and simulation of indoor air flow , 1998 .

[20]  Z. Lian,et al.  Investigation of gender difference in thermal comfort for Chinese people , 2008, European Journal of Applied Physiology.

[21]  K. Cena,et al.  Thermal comfort and behavioural strategies in office buildings located in a hot-arid climate , 2001 .

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

[23]  D. Sessler,et al.  Skin-temperature gradients are a validated measure of fingertip perfusion , 2003, European Journal of Applied Physiology.

[24]  T Schneider,et al.  Visual analogue scales for detecting changes in symptoms of the sick building syndrome in an intervention study. , 1999, Scandinavian journal of work, environment & health.

[25]  Jørn Toftum,et al.  Remote Performance Measurement (RPM) – A new, internet-based method for the measurement of occupant performance in office buildings , 2005 .

[26]  E. Scherder,et al.  Circadian and age-related modulation of thermoreception and temperature regulation: mechanisms and functional implications , 2002, Ageing Research Reviews.

[27]  Lower sedentary metabolic rate in women compared with men. , 1992 .

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

[29]  Claude-Alain Roulet,et al.  Using large radiant panels for indoor climate conditioning , 1999 .

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

[31]  Gail Brager,et al.  A Standard for Natural Ventilation , 2000 .

[32]  Charlie Huizenga,et al.  Skin and core temperature response to partial- and whole-body heating and cooling , 2004 .

[33]  S. Karjalainen.  Gender differences in thermal comfort and use of thermostats in everyday thermal environments , 2007 .

[34]  Brm Boris Kingma,et al.  Thermal sensation: a mathematical model based on neurophysiology. , 2012, Indoor air.

[35]  F. Baker,et al.  Oral contraceptives alter sleep and raise body temperature in young women , 2001, Pflügers Archiv.

[36]  R L Burse,et al.  Sex Differences in Human Thermoregulatory Response to Heat and Cold Stress , 1979, Human factors.

[37]  Vivian Loftness,et al.  Investigation on the impacts of different genders and ages on satisfaction with thermal environments in office buildings , 2010 .

[38]  Josef Flammer,et al.  Thermal discomfort with cold extremities in relation to age, gender, and body mass index in a random sample of a Swiss urban population , 2010, Population health metrics.

[39]  Josef Flammer,et al.  Cold extremities and difficulties initiating sleep: evidence of co‐morbidity from a random sample of a Swiss urban population , 2008, Journal of sleep research.

[40]  Jacques Miriel,et al.  Radiant ceiling panel heating–cooling systems: experimental and simulated study of the performances, thermal comfort and energy consumptions , 2002 .

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

[42]  Arnold Janssens,et al.  Passive cooling in a low-energy office building , 2005 .

[43]  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.