A heat dissipation tutorial for wearable computers

Starner﻿﻿, Thad; Maguire, Yael

doi:10.1109/iswc.1998.729540

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…According to Table , the wearer has different sensations due to skin temperature . Our results show that in cold environments, skin temperature is around 27 °C, and the wearer has a tolerable cold sensation on their skin.…”

Section: Resultsmentioning

confidence: 74%

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Theoretical modeling of thermal stress imposed by selective permeation membranes reinforced with graphene oxide

Gorji

Karimi

Larki

et al. 2017

J of Applied Polymer Sci

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The main purpose of the present work is to study the thermal stress imposed by selective permeation hydrogel‐filled nonwoven membranes (SPHM) in various environmental conditions, including cold, moderate and hot, in view of high and low wearer activity levels. In addition, graphene oxide (GO) has been used in the matrix structure of SPHM to reduce thermal stress. Hence, a mathematical model is proposed to study one‐dimensional heat transfer through SPHM reinforced with GO. Heat transfer equation was solved using the differential quadrature method and the resulting model was verified by experiments using a dynamic heat transfer simulation apparatus. It was observed that SPHM causes a significant thermal stress, especially in hot environments, and high activity level due to the low thermal conductivity of hydrogels. The results also showed that an increase in the GO content from 0.1% up to 0.5% leads to an increase in thermal conductivity up to 85% of blank SPHM without GO. Therefore, SPHM reinforced with GO is a promising candidate for protective clothing, especially in hot environments. Also, the mathematical model can be useful in predicting thermal stress for designing SPHM‐based PCs in various environmental conditions and activity levels. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44752.

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Section: Resultsmentioning

confidence: 74%

“…This hot plate provides different levels of heat flux . In this study, the heat fluxes of 200 and 800 J/m 2 .s are considered as low and high activity levels of the wearer, respectively . The hot plate is located inside a chamber that can simulate different thermal conditions.…”

Section: Methodsmentioning

confidence: 99%

Theoretical modeling of thermal stress imposed by selective permeation membranes reinforced with graphene oxide

Gorji

Karimi

Larki

et al. 2017

J of Applied Polymer Sci

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“…Burns due to exposure to high temperatures is a serious safety concern for users of heating textiles. Skin temperature is around 34-35°C although it differs slightly between different regions of the human body while the core temperature of the human body is maintained at around 37°C [52,53]. Figure 7 illustrates the effect of exposure of the human skin to different temperatures [54][55][56].…”

Section: Exposure To High Temperaturesmentioning

confidence: 99%

Smart Textiles Testing: A Roadmap to Standardized Test Methods for Safety and Quality-Control

Shuvo¹,

Decaens²,

Lachapelle³

et al. 2021

Textiles for Functional Applications

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Test methods for smart or electronic textiles (e-textiles) are critical to ensure product safety and industrial quality control. This paper starts with a review of three key aspects: (i) commercial e-textile products/technologies, (ii) safety and quality control issues observed or foreseen, and (iii) relevant standards published or in preparation worldwide. A total of twenty-two standards on smart textiles – by CEN TC 248/WG 31, IEC TC 124, ASTM D13.50, and AATCC RA111 technical committees – were identified; they cover five categories of e-textile applications: electrical, thermal, mechanical, optical, and physical environment. Based on the number of e-textile products currently commercially available and issues in terms of safety, efficiency, and durability, there is a critical need for test methods for thermal applications, as well as to a lesser degree, for energy harvesting and chemical and biological applications. The results of this study can be used as a roadmap for the development of new standardized test methods for safety & quality control of smart textiles.

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“…The surface temperature of the phone cannot exceed 40°C when it is held by a human hand. Based on the guidelines in [2], this form factor can dissipate only 2 W. Fig. 2 is a drawing of a 3D packaging technology called package-on-package (PoP) commonly used to meet the space constraint in mobile phones.…”

Section: Size and Thermal Constraintsmentioning

confidence: 99%

Low power and low EM emission DRAM memory interface for HD video recording in mobile devices

Yip

Dressler

Tsang

et al. 2010

The 2010 International Conference on Green Circuits and Systems

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Next generation processor and DRAM memory for mobile phones are expected to provide the higher bandwidth (BW) necessary for full high definition (UD) video recording. The power consumed by current mobile phones and a camcorder was measured during video capture and extrapolated to estimate the power requirements of 1920xl080p recording at 60 and 120 fps. CMOS process and voltage scaling was then applied to the data. The results show that scaling alone is insufficient to lower the power consumption to within the heat dissipation limit of typical mobile phones. A new, low power DRAM interface is presented to enable handheld devices to record full 3D RD video without overheating the device. This paper also summarizes the impact of the new memory architecture on clock distribution and jitter and the EM emission from the interface. The lack of significant near or far field emission implies that the interface will not disrupt other circuits in the same mobile device when delivering the data rate needed by UD video recording.

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A heat dissipation tutorial for wearable computers

Cited by 8 publications

References 3 publications

Theoretical modeling of thermal stress imposed by selective permeation membranes reinforced with graphene oxide

Theoretical modeling of thermal stress imposed by selective permeation membranes reinforced with graphene oxide

Smart Textiles Testing: A Roadmap to Standardized Test Methods for Safety and Quality-Control

Low power and low EM emission DRAM memory interface for HD video recording in mobile devices

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