Thermal Considerations on Adiabatic Coaxial Line for Microcalorimeter Measurements

Ivšić, Branimir; Dadić, Martin; Malarić, Roman; Martinovic, Zeljko

doi:10.23919/smagrimet.2019.8720384

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…Nevertheless, the analytical calculations for the gapless line reveal that heat flow through the inner conductor is an order of magnitude lower than the overall heat flow. This indicates that most of the heat flow occurs via the outer conductor [5].…”

Section: Thermal Considerations On the Adiabatic Linementioning

confidence: 98%

“…In this case, an analytical solution can be calculated applying the Fourier's law of heat conduction [25]. This analytically calculated reference value is 0.2300 W [5]. In addition, it can also be seen that heat flow densities through the gap are several orders of magnitudes lower than through the line, which justifies the use of gaps in reducing the spurious thermal flow throughout the coaxial line.…”

Section: Thermal Considerations On the Adiabatic Linementioning

confidence: 99%

“…For calibration factor determination of the commercial thermistor mounts, as well as for the primary power standards, devices named microcalorimeters are nowadays most commonly used due to their high stability in terms of parameters that determine detector efficiency. The thermistor mounts present common transfer power standards in the power range of mW, where most personal communication systems operate [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Adiabatic Coaxial Line for Microcalorimeter Power Measurements in Wireless Communication for Smart Grid

Martinovic¹,

Dadić

Ivšić

et al. 2019

Energies

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This paper presents the extended results and prototype of the adiabatic copper conductor constructed with two interruption points in the external conductor layer, for use as a microcalorimeter power standard in wireless communication for a smart grid frequency range. Gaps are intended to drive down the thermal transfer from the outer environment into microcalorimeter and to reduce measurement inaccuracies in the microcalorimeter. The proposed design method is based on the combination of thermal and electromagnetic finite-element method simulations by which the desired line performance has been tailored. A prototype of the proposed adiabatic line has been manufactured and measurements on the prototype are presented along with the design procedure. Measured results are in line with the ones predicted by numerical calculations.

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Section: Thermal Considerations On the Adiabatic Linementioning

confidence: 98%

Section: Thermal Considerations On the Adiabatic Linementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Adiabatic Coaxial Line for Microcalorimeter Power Measurements in Wireless Communication for Smart Grid

Martinovic¹,

Dadić

Ivšić

et al. 2019

Energies

Self Cite

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Finite-Element Simulation for Thermal Modeling of a Cell in an Adiabatic Calorimeter

González-Durán¹,

Rodríguez‐Reséndiz

Ramirez³

et al. 2020

Energies

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This research obtains a mathematical formulation to determine the heat transfer in a transient state, in a calorimeter cell, considering an adiabatic system. The development of the cell was established and the mathematical model was transiently solved, which approximated the physical phenomenon under the cell operation. A numerical method for complex geometries was used to validate performance. The results obtained in the transient heat transfer in a cylinder under boundary and initial conditions were compared using an analytical solution and numerical analysis employing the finite-element method with commercial software. The study from the temperature distribution can afford, selection between a cylindrical and spherical geometry, design criteria that are generated by changing parameters such as dimension, temperature, and working fluids to develop an adiabatic calorimeter to measure the heat capacity in fluids. We show the mathematical solution with its initial and boundary conditions as well as a comparison with a numerical solution for a cylindrical cell with a maximum error from 0.075% in the temperature value, along with a theoretical and numerical analysis for a temperature difference of 1 °C.

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Thermal Considerations on Adiabatic Coaxial Line for Microcalorimeter Measurements

Cited by 2 publications

References 9 publications

An Adiabatic Coaxial Line for Microcalorimeter Power Measurements in Wireless Communication for Smart Grid

An Adiabatic Coaxial Line for Microcalorimeter Power Measurements in Wireless Communication for Smart Grid

Finite-Element Simulation for Thermal Modeling of a Cell in an Adiabatic Calorimeter

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