Thermal sensation, rate of temperature change, and the heat dissipation design for tablet computers.

Past research has shown that the rate of change of skin surface temperature can affect thermal sensation. This study investigated users' thermal responses to a tablet heating surface with different heat pads and different temperature change rates. The test conditions included: A. keeping the surface at a constant 42 °C, B. increasing the surface temperature from 38 °C to 42 °C at a rate of 0.02 °C/s in progressive intervals, C. increasing the temperature at 0.15 °C/s in progressive intervals, and D. Heating two left and right side pads alternately from 38 °C to 42 °C at 0.15 °C/s in progressive intervals. Overall results showed the lowest temperature change rate of 0.02 °C/s was most preferred in terms of thermal comfort. The findings suggest a potential to improve user thermal experience by dissipating tablet computer heat at a lower temperature change rate, or by alternating the dissipation areas.

[1]  K. O. Johnson,et al.  Warm fibers innervating palmar and digital skin of the monkey: responses to thermal stimuli. , 1979, Journal of neurophysiology.

[2]  Alan Hedge,et al.  Surface and Indoor Temperature Effects on User Thermal Responses to Holding a Simulated Tablet Computer , 2016 .

[3]  Lawrence E. Marks,et al.  Temporal summation at the warmth threshold , 1973 .

[4]  H Siekmann.  Determination of maximum temperatures that can be tolerated on contact with hot surfaces. , 1989, Applied ergonomics.

[5]  Efraim Rotem,et al.  Power and thermal constraints of modern system-on-a-chip computer , 2013 .

[6]  H Siekmann,et al.  Recommended maximum temperatures for touchable surfaces. , 1990, Applied ergonomics.

[7]  D. Claus,et al.  Methods of measurement of thermal thresholds , 1987, Acta neurologica Scandinavica.

[8]  J D Greenspan,et al.  The effects of rate of temperature change and adapting temperature on thermal sensitivity. , 1977, Sensory processes.

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

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

[11]  R. Meyer,et al.  Response of C fibre nociceptors in the anaesthetized monkey to heat stimuli: estimates of receptor depth and threshold. , 1995, The Journal of physiology.

[12]  Vladimir Getov,et al.  Towards an application-specific thermal energy model of current processors , 2015, E2SC '15.

[13]  Philip R. Cohen,et al.  Laptop-induced erythema ab igne: Report and review of literature. , 2012, Dermatology Online Journal.

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

[15]  D. Yarnitsky,et al.  Single C nociceptor responses and psychophysical parameters of evoked pain: effect of rate of rise of heat stimuli in humans. , 1992, The Journal of physiology.

[16]  D. Yeomans,et al.  Nociceptive responses to high and low rates of noxious cutaneous heating are mediated by different nociceptors in the rat: electrophysiological evidence , 1996, Pain.

[17]  H. Hensel.  Thermoreception and temperature regulation. , 1981, Monographs of the Physiological Society.

[18]  Mulugeta K. Berhe.  Ergonomic Temperature Limits for Handheld Electronic Devices , 2007 .

[19]  Test-Retest Reliability of Thermal Temporal Summation Using an Individualized Protocol , 2012 .

[20]  D. Kenshalo,et al.  Response characteristics of cutaneous warm receptors in the monkey. , 1977, Journal of neurophysiology.

[21]  P C O'Brien,et al.  Cool, warm, and heat‐pain detection thresholds , 1993, Neurology.

[22]  Avinash Ananthakrishnan,et al.  Power management on 14 nm Intel® Core− M processor , 2015, 2015 IEEE Symposium in Low-Power and High-Speed Chips (COOL CHIPS XVIII).

[23]  Martin Halvey,et al.  Some like it hot: thermal feedback for mobile devices , 2011, CHI.

[24]  A. Franks,et al.  Antiphospholipid-antibody-associated panniculitis. , 2012, Dermatology online journal.

[25]  Antti Pertovaara,et al.  Influence of the rate of temperature change on thermal thresholds in man , 1985, Experimental Neurology.

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

[27]  R. Duclaux,et al.  Constancy of heat pain characteristics to changes in skin and body temperature , 1977, Brain Research.

[28]  A. Pertovaara,et al.  Influence of skin temperature on heat pain threshold in humans , 2004, Experimental Brain Research.

[29]  D. Kenshalo,et al.  Temporal Course of Thermal Adaptation , 1966, Science.

[30]  Alan Hedge,et al.  Laptop Heat and Models of User Thermal Discomfort , 2014 .

[31]  S. Masood,et al.  Full thickness thigh burn caused by a laptop computer: It's hotter than you think. , 2011, Burns : journal of the International Society for Burn Injuries.

[32]  R. Meyer,et al.  Response of C fibre nociceptors in the anaesthetized monkey to heat stimuli: correlation with pain threshold in humans. , 1995, The Journal of physiology.

[33]  William Maltz,et al.  On the Thermal Management Challenges in Next Generation Handheld Devices , 2013 .

[34]  David Yarnitsky,et al.  Studies of heat pain sensation in man: perception thresholds, rate of stimulus rise and reaction time , 1990, Pain.

[35]  D. Kenshalo,et al.  Warm and cool thresholds as a function of rate of stimulus temperature change , 1968 .

[36]  R D Ray.  The theory and practice of safe handling temperatures. , 1984, Applied ergonomics.

[37]  Richard P. Wells,et al.  Biomechanical Loading on the Hand, Wrist, and Forearm When Holding a Tablet Computer , 2015 .