Research Papers

Surface and Indoor Temperature Effects on User Thermal Responses to Holding a Simulated Tablet Computer

[+] Author and Article Information
Han Zhang, Alan Hedge

Department of Design and
Environmental Analysis,
Cornell University,
Ithaca, NY 14853

Beiyuan Guo

State Key Laboratory of Rail Traffic
Control and Safety,
Beijing Jiaotong University,
Beijing, China 100044
e-mail: byguo@bjtu.edu.cn

1Corresponding author.

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received January 4, 2016; final manuscript received April 13, 2016; published online May 16, 2016. Assoc. Editor: Ashish Gupta.

J. Electron. Packag 138(3), 031003 (May 16, 2016) (7 pages) Paper No: EP-16-1003; doi: 10.1115/1.4033415 History: Received January 04, 2016; Revised April 13, 2016

A series of experiments was conducted to investigate participant thermal responses to different surface temperatures, from 34 to 44 °C, for a simulated tablet computer in different ambient temperatures (13 °C, 23 °C, and 33 °C). Two subjective measures, thermal sensations and thermal comfort, were reported by the participants. Within the same ambient temperature, participants' thermal sensation and discomfort scores were positively correlated with the increase of surface temperature (higher surface temperatures gave warmer sensations). Thermal comfort also decreases with the increase of surface temperature in the tested range. In addition, ambient temperature moderated the effect of surface temperature on participants' thermal sensation scores. The higher surface temperature of 44 °C was rated warmer at 33 °C than 13 °C, but lower surface temperatures (34–38 °C) were rated less warm at 33 °C than 13 °C. On the other hand, all the surface temperatures were perceived less uncomfortable in an environment at 13 °C environment than at 33 °C. The findings can be used to set limits for future tablet computer heat dissipation designs to improve user's thermal experiences.

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Fig. 1

A participant holding the heating surface (left) and the IR image (right)

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Fig. 2

Control interface and stable heating temperature

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Fig. 3

Fingers thermal sensation and comfort scores with surface temperature

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Fig. 4

Interaction effect of ambient temperature and surface temperature on fingers

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Fig. 5

Fingers thermal sensation scores with surface temperature

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Fig. 6

Fingers thermal sensation scores with surface temperature (error bar is 1 standard error from the mean)

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Fig. 7

Palm thermal sensation scores with surface temperature (error bar is 1 standard error from the mean)

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Fig. 8

Palm thermal comfort scores with surface temperature (error bar is 1 standard error from the mean)



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