Design methodology for laboratory scale borehole storage: An approach based on analytically-derived invariance requirements and numerical simulations

Pallard, Willem Mazzotti; Lazzarotto, Alberto; Sequera, Jose Enrique Acuña; Palm, Björn

doi:10.1016/j.geothermics.2020.101856

Cited by 6 publications

(2 citation statements)

References 44 publications

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“…Although it is hard to invalidate a model with field data due to many uncontrolled parameters (e.g. ground water flow, exact borehole geometry) [60], DTS measurements could be very informative as to the model strengths and drawbacks. Better models lead to more accurate design and estimation of running costs.…”

Section: Discussionmentioning

confidence: 99%

Calibration and Uncertainty Quantification for Single-Ended Raman-Based Distributed Temperature Sensing: Case Study in a 800 m Deep Coaxial Borehole Heat Exchanger

Pallard¹,

Lazzarotto²,

Acuña³

et al. 2023

Preprint

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Raman-based Distributed Temperature Sensing (DTS) is a valuable tool for field testing and validating heat transfer models in Borehole Heat Exchanger (BHE) and Ground Source Heat Pump (GSHP) applications. However, temperature uncertainty is rarely reported in the literature. In this paper, a new calibration method is proposed for single-ended DTS configurations, along with a method to remove fictitious temperature drifts due to ambient air variations. The methods are implemented for a Distributed Thermal Response Test case study in an 800 m deep coaxial BHE. The results show that the calibration method and temperature drift correction are robust and give adequate results, with a temperature uncertainty of ± 0.58, 0.74, 1.1 and 1.7 K found at depths of 200, 300, 500 and 800 m, respectively. The temperature uncertainty increases non-linearly with depth and is dominated by the uncertainty in the calibrated parameters for depths larger than 200 m. The paper also offers insights into thermal features observed during the DTRT, including a heat flux inversion along the borehole depth and the slow temperature homogenization under circulation. Distributed temperature measurements and their uncertainties are useful tools in determining the strengths and drawbacks of ground heat transfer models.

show abstract

Section: Discussionmentioning

confidence: 99%

Calibration and Uncertainty Quantification for Single-Ended Raman-Based Distributed Temperature Sensing: Case Study in a 800 m Deep Coaxial Borehole Heat Exchanger

Pallard¹,

Lazzarotto²,

Acuña³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…One of the main points of quantifying temperature uncertainty with Raman-based DTS is the verification or validation of the borehole heat transfer model. Although it is hard to invalidate a model with field data due to many uncontrolled parameters (e.g., ground water flow, exact borehole geometry) [ 70 ], DTS measurements could be very informative as to the model’s strengths and drawbacks. Better models lead to more accurate design and estimation of running costs.…”

Section: Discussionmentioning

confidence: 99%

Calibration and Uncertainty Quantification for Single-Ended Raman-Based Distributed Temperature Sensing: Case Study in a 800 m Deep Coaxial Borehole Heat Exchanger

Pallard

Lazzarotto

Acuña

et al. 2023

Sensors

Self Cite

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Raman-based distributed temperature sensing (DTS) is a valuable tool for field testing and validating heat transfer models in borehole heat exchanger (BHE) and ground source heat pump (GSHP) applications. However, temperature uncertainty is rarely reported in the literature. In this paper, a new calibration method was proposed for single-ended DTS configurations, along with a method to remove fictitious temperature drifts due to ambient air variations. The methods were implemented for a distributed thermal response test (DTRT) case study in an 800 m deep coaxial BHE. The results show that the calibration method and temperature drift correction are robust and give adequate results, with a temperature uncertainty increasing non-linearly from about 0.4 K near the surface to about 1.7 K at 800 m. The temperature uncertainty is dominated by the uncertainty in the calibrated parameters for depths larger than 200 m. The paper also offers insights into thermal features observed during the DTRT, including a heat flux inversion along the borehole depth and the slow temperature homogenization under circulation.

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Experimental investigation on the performance of a borehole thermal energy storage system based on similarity and symmetry

Hu,

Li,

Zhang

et al. 2024

Energy

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Design methodology for laboratory scale borehole storage: An approach based on analytically-derived invariance requirements and numerical simulations

Cited by 6 publications

References 44 publications

Calibration and Uncertainty Quantification for Single-Ended Raman-Based Distributed Temperature Sensing: Case Study in a 800 m Deep Coaxial Borehole Heat Exchanger

Calibration and Uncertainty Quantification for Single-Ended Raman-Based Distributed Temperature Sensing: Case Study in a 800 m Deep Coaxial Borehole Heat Exchanger

Calibration and Uncertainty Quantification for Single-Ended Raman-Based Distributed Temperature Sensing: Case Study in a 800 m Deep Coaxial Borehole Heat Exchanger

Experimental investigation on the performance of a borehole thermal energy storage system based on similarity and symmetry

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