Apparatus for direct measurement of insulation thermal...

Details Apparatus for direct measurement of insulation thermal... Apparatus for direct measurement of insulation thermal...

2007-01-26

2009-06-02

Verbitsky, Gail (Department: 2855)

Thermal measuring and testing

Heat flux measurement

C374S005000, C374S031000

Reexamination Certificate

active

07540656

ABSTRACT:
An apparatus for measuring insulation thermal performance is provided, particularly between ambient and cryogenic temperatures. A warm-temperature boundary has a continuous sample contact surface that is divided into a metered central zone and a boundary guard zone. Each zone is independently heated, and the power necessary to maintain the central zone at constant temperature is directly equated to heat flux through the insulation at the temperature boundary conditions. Methods for measuring insulation thermal performance are also disclosed.

REFERENCES:
patent: 3733887 (1973-05-01), Stanley et al.
patent: 5940784 (1999-08-01), El-Husayni
patent: 6487866 (2002-12-01), Fesmire et al.
ASTM International, Designation: C 177-04, “Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus” . 2004, 21 pages.
International Standard, ISO 8302, “Thermal Insulation—Determination of Steady-State Thermal Resistance and Related Properties—Guarded Hot Plate Apparatus,” 1991, 54 pages.

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