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Technical Briefs

Measurement of Total Hemispherical Emissivity Using Vacuum Guarded Hot Plate

[+] Author and Article Information
Jongmin Kim

 Korea Advanced Institute of Science and Technology, 291 Daehak-ro(373-1 Guseong-dong), Yuseong-gu, Daejeon 305-701, Republic of Koreasala@kaist.ac.kr

Choongyo Jang

 Korea Advanced Institute of Science and Technology, 291 Daehak-ro(373-1 Guseong-dong), Yuseong-gu, Daejeon 305-701, Republic of Koreajangchoonghyo@kaist.ac.kr

Tae-Ho Song1

 Korea Advanced Institute of Science and Technology, 291 Daehak-ro(373-1 Guseong-dong), Yuseong-gu, Daejeon 305-701, Republic of Koreathsong@kaist.ac.kr

1

Corresponding author.

J. Heat Transfer 134(11), 114501 (Sep 24, 2012) (4 pages) doi:10.1115/1.4005748 History: Revised October 31, 2011; Received December 03, 2011; Published September 24, 2012; Online September 24, 2012

In this paper, a new measurement method for the total hemispherical emissivity of surfaces is introduced. A vacuum guarded hot plate apparatus is developed and it is employed for the emissivity measurement. Al, Ag, Au, and Ni coatings and STS 304 plate are used as the specimen. Measured total hemispherical emissivities are 0.05–0.24 with 8.1% uncertainty at most. This proves the reliability of current method even for highly reflective surfaces.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Heat transfer between surfaces: (1), (2) surfaces of bottom and upper plates, (3) support pillars

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Figure 2

Schematic diagram of the vacuum guarded hot plate: (1) heater block, (2) cold plate, (3) guard, (4) auxiliary insulation, (5) hot plate, (6) pressure pad, (7) vacuum chamber, (8) specimen, (x) thermocouple, (o) thermopile

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Figure 3

Perspective CAD view of the apparatus (up) and the whole system (down)

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Figure 4

Possible heat losses at the heater block and the bottom plate of the specimen

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Figure 5

Plane view of the heat loss at the bottom plate (left) and its simplification (right)

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