Heat Capacity Uncertainty Calculation for the Eutectic Mixture of Biphenyl/Diphenyl Ether Used as Heat Transfer Fluid: Preprint

Research output: Contribution to conferencePaper

Abstract

The main objective of this study was to calculate the uncertainty at 95% confidence for the experimental values of heat capacity of the eutectic mixture of biphenyl/diphenyl ether (Therminol VP-1) determined from 300 to 370 degrees C. Twenty-five samples were evaluated using differential scanning calorimetry (DSC) to obtain the sample heat flow as a function of temperature. The ASTM E-1269-05standard was used to determine the heat capacity using DSC evaluations. High-pressure crucibles were employed to contain the sample in the liquid state without vaporizing. Sample handling has a significant impact on the random uncertainty. It was determined that the fluid is difficult to handle, and a high variability of the data was produced. The heat capacity of Therminol VP-1 between 300 and370 degrees C was measured to be equal to 0.0025T+0.8672 with an uncertainty of +/- 0.074 J/g.K (3.09%) at 95% confidence with T (temperature) in Kelvin.
Original languageAmerican English
Number of pages9
StatePublished - 2012
EventSolarPACES 2012 - Marrakech, Morocco
Duration: 11 Sep 201214 Sep 2012

Conference

ConferenceSolarPACES 2012
CityMarrakech, Morocco
Period11/09/1214/09/12

NREL Publication Number

  • NREL/CP-5500-56446

Keywords

  • biphenyl/diphenyl ether
  • differential scanning calorimetry
  • heat capacity
  • uncertainty

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