A guarded cold plate apparatus for absolute measurement of heat flow

• Published in: International journal of heat and mass transfer Vol. 41; no. 20; pp. 3099 - 3108
• Main Authors: Dey, C.J., Read, A.J., Collins, R.E., Brunotte, M.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-10-1998; Elsevier
• Subjects: Calorimetry; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Data reduction; Exact sciences and technology; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity); Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; Plates (structural components); Thermal instruments, apparatus and techniques; Thermal variables measurement; Tin oxides; Thermal properties; Measurement errors; Emissivity; Thermal radiation; Bias; Heat flow measurement; Glass; Instrumentation; Radiative transfer; Coatings
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/S0017-9310(98)00026-X

This paper describes the working principles and operation of a new instrument for making absolute measurements of heat flow. This instrument, called the guarded cold plate apparatus, differs from standard guarded hot plate designs in that the measured heat flow through the sample is towards the metering side, rather than away from it. A guarded cold plate apparatus is described for measurement of the radiative heat flow from high emittance surfaces at temperatures up to 200°C. Values of emittance obtained from such measurements agree with those derived from infrared reflectance data to within ±5%