Abstract
Technical solutions dominate current approaches to smartphone overheating, yet user-centred strategies that exploit zonal thermal perception remain underexplored. This study examined how contact region (thumb, index finger, thenar eminence), surface temperature (36.0-43.5°C), and exposure duration (0s vs. 120s) jointly shape thermal experience. Thirty adults completed trials with a prototype featuring hotspots at high-frequency grip locations, rating perceived heat and thermal dissatisfaction using two Borg CR-10 items. A PERMANOVA revealed a significant Area × Temperature interaction (F = 10.35, p < .001): the thenar eminence showed disproportionately higher ratings at ≥ 42 °C than the other areas. Main effects of temperature and duration were also significant (p < .001), indicating discomfort intensifies with hotter surfaces and prolonged contact. These findings provide an empirical basis for strategic thermal zoning, placing or redirecting heat away from high-sensitivity regions, and complement hardware-level cooling with ergonomically informed design.
Keywords
Thermal comfort, User experience, Smartphone ergonomics, Hand thermal sensitivity, Zonal thermal design
DOI
https://doi.org/10.21606/drs.2026.2351
Citation
Zeng, K., Xiao, X., and Wang, H. (2026) Strategic thermal design for smartphones: An experimental analysis of zonal heat perception across hand contact regions, in Simeone, L., Gray, C. M., Verhoeven, A., de Götzen, A., Bakırlıoğlu, Y., Zohar, H., Stead, M., and Buwert, P. (eds.), DRS2026: Edinburgh, 8–12 June, Edinburgh, United Kingdom. https://doi.org/10.21606/drs.2026.2351
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Included in
Strategic thermal design for smartphones: An experimental analysis of zonal heat perception across hand contact regions
Technical solutions dominate current approaches to smartphone overheating, yet user-centred strategies that exploit zonal thermal perception remain underexplored. This study examined how contact region (thumb, index finger, thenar eminence), surface temperature (36.0-43.5°C), and exposure duration (0s vs. 120s) jointly shape thermal experience. Thirty adults completed trials with a prototype featuring hotspots at high-frequency grip locations, rating perceived heat and thermal dissatisfaction using two Borg CR-10 items. A PERMANOVA revealed a significant Area × Temperature interaction (F = 10.35, p < .001): the thenar eminence showed disproportionately higher ratings at ≥ 42 °C than the other areas. Main effects of temperature and duration were also significant (p < .001), indicating discomfort intensifies with hotter surfaces and prolonged contact. These findings provide an empirical basis for strategic thermal zoning, placing or redirecting heat away from high-sensitivity regions, and complement hardware-level cooling with ergonomically informed design.