Analysis of time-dependent heat transfer with periodic excitation in microscale systems

Shockner, Tomer; Chowdhury, Tanvir Ahmed; Putnam, Shawn A.; Ziskind, G.

doi:10.1016/j.applthermaleng.2021.117225

Cited by 3 publications

(1 citation statement)

References 38 publications

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“…This periodic thermal problem was also found in industrial areas like blast furnace regenerators and aero-engine cylinders. It is the practical value of heat-flux frequency-domain dynamic testing [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Calibration of a Thin-Film Heat-Flux Sensor in Time and Frequency Domains

Yin

Wang

et al. 2022

Sensors

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This paper mainly studies the model design of a thin-film heat-flux sensor (TFHFS), and focuses on the comparison of three dynamic calibration methods. The primary motivation for studying this came from the urgent need for heat-flux dynamic measurements in extreme environments, and the one-sidedness of the dynamic performance evaluation of the corresponding TFHFS. The dynamic theoretical model of the TFHFS was originally established on the principle of a temperature gradient on the basis of a thermal radiation boundary. Then, a novel TFHFS sensor was developed, which can be used at temperatures above 880 °C and has a high sensitivity of 2.0 × 10−5 mV/(W/m2). It can function stably for long durations under a heat-flux density of 3 MW/m2. The steady-state, transient, and frequency calibration of a TFHFS were compared to comprehensively analyze the dynamic characteristics of the TFHFS. The steady-state response time measured by the step excitation method was found to be 0.978 s. The QR decomposition method was applied to the steady-state response experimental model construction, and the fitting degree of a second-order transfer function model obtained was 98.61%. Secondly, the transient response time of the TFHFS was 0.31 ms based on the pulse-excitation method. The transient relationship between the surface temperature and the heat flux, and the pulse-width dependence of the TFHFS transient response time were established. Surprisingly, the response frequency of the TFHFS, about 3000 Hz, was efficiently tested using the frequency response function (FRF), which benefitted from the harmonic characteristics of a periodic square-wave excitation signal. Finally, a comprehensive evaluation of the dynamic performance of the TFHFS was realized.

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Section: Introductionmentioning

confidence: 99%

Dynamic Calibration of a Thin-Film Heat-Flux Sensor in Time and Frequency Domains

Yin

Wang

et al. 2022

Sensors

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Experimental and numerical evaluation of phase-change material performance in a vertical cylindrical capsule for thermal energy storage

Shockner

Ziskind²

2023

Applied Thermal Engineering

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Application of the Heat Penetration Distance in the Design of the Hole Spacing of Ground-Coupled Heat Pumps

et al. 2023

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Due to issues such as heat accumulation, the site area, and project investment, the reasonable determination of the hole spacing for heat exchangers has become one of the key design points of the ground-coupled heat pump system. Based on the definition of heat penetration in heat transfer and the research method of the inverse problem, a direct algorithm of the heat penetration distance in the aquifer was proposed using the analytical solution to the mathematical model for one-dimensional heat convection–conduction problems. Taking a vertical ground-coupled heat pump project in Hefei, Anhui Province, China, as an example, a three-dimensional hydro-thermal coupling numerical simulation model was established, and the influence radius during the refrigeration and heating periods under the action of a single borehole heat exchanger was determined. Comparing the heat penetration distance with the influence radius, the results show that the relative errors of the results obtained by the two methods are less than 10%, which verifies the rationality and effectiveness of the calculated penetration distance in the aquifer. At the end of the cooling or heating period, the heat penetration distance in the aquifer is calculated to be 7.59 m. Therefore, the proposed method is straightforward and efficient, which can provide a convenient approach to determining the reasonable hole spacing of the heat pump system.

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Analysis of time-dependent heat transfer with periodic excitation in microscale systems

Cited by 3 publications

References 38 publications

Dynamic Calibration of a Thin-Film Heat-Flux Sensor in Time and Frequency Domains

Dynamic Calibration of a Thin-Film Heat-Flux Sensor in Time and Frequency Domains

Experimental and numerical evaluation of phase-change material performance in a vertical cylindrical capsule for thermal energy storage

Application of the Heat Penetration Distance in the Design of the Hole Spacing of Ground-Coupled Heat Pumps

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