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Comparison of modes of operation for guarded hot plate apparatus with emphasis on transient characteristics

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Affiliation
  1. National Research Council Canada
FormatText, Article
Subjectheat meters; thermal conductivity; thermal emissivity; heat transfer; guarded hot plate; modes; optimum boundary conditions; response time; thermal diffusivity; transient errors; transient heat flow
Abstract
The constant heat flux and constant temperature modes of operation of the guarded hot plate apparatus are compared and the existence of an optimum heat flux boundary condition is examined. The step response equations for the different modes and for various preconditioning temperatures are tabulated and presented in graphical form. Optimum preconditioning temperatures are determined. Effects of disturbances and plate capacity are discussed and control and measurement problems compared. A hybrid mode of operation is suggested. The extension of the results to the use of heat meters and transient heat flow apparatus is discussed. Constant temperature or a hybrid mode of operation is found to be the most practical. The response times can be an order of magnitude less than constant heat flux operation. Use of the guarded hot plate apparatus in the constant temperature mode is suggested for other measurements.
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  • NBS Special Publication (1 April 1969): 229–240.
LanguageEnglish
Peer reviewedNo
IdentifierDBR-RP-396
NRC numberNRCC 10678
NRC-IRC-2522
NPARC number20374753
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Record identifier2e7b99cb-5e18-4a93-9778-89ff0b68ff33
Record created2012-07-23
Record modified2023-12-15

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