The application of Vacuum Insulated Tubing in Deep Borehole Heat Exchangers

Śliwa, T.; Kruszewski, Michał; Assadi, Mohsen; Sapińska-Śliwa, Aneta

doi:10.7494/drill.2017.34.2.597

“…In this study, we have assumed an HDPE central coaxial pipe; a more conductive (steel) pipe would allow more internal heat transfer and result in a higher R b,eff . Some researchers have explored the possibility of insulated or vacuum-filled coaxial pipes in order to reduce internal heat transfer (Rybach and Hopkirk, 1995;Śliwa et al 2017;Wirtén, 2018).…”

Section: Inverse Analysis and Effective Borehole Thermal Resistancementioning

confidence: 99%

Generic modelling to develop thermal yield nomograms for coaxial deep borehole heat exchangers (DBHEs)

Banks,

Brown,

Kolo

et al. 2024

QJEGH

0

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Numerical modelling of coaxial deep borehole heat exchangers (DBHE) can be resource-intensive. Simpler, transparent analytical models and nomograms would be valuable to developers and geologists for evaluating thermal output. An analytical computational model by Beier (2020) was used to produce nomograms of geothermal heat yield by systematically varying DBHE depth and rock thermal conductivity, while assuming two generic simplified DBHE designs, a geothermal gradient of 25°C/km and a fluid circulation rate of 5 L/s. Continuous 25-year heat yields from a 1000 m DBHE range from 27.3 to 54.8 kW for thermal conductivities of 1.6 to 3.6 W/m/K. For a 3000 m DBHE, they range from 165 kW to 281 kW. Effective borehole thermal resistance ( R b,eff ) increases strongly as DBHE depth increases, due to internal heat transfer between upflow and downflow elements. Simulations correspond well with results from industry-standard Earth Energy Designer software for shallow 200 m coaxial BHE. They modestly underestimate OpenGeoSys numerical modelled thermal yields by 2-4% for DBHE in the range 1000 to 3000 m depth. Modelled temperature evolution closely approximates an analytical “line heat source” approach, implying that simpler analytical approaches are plausible for DBHE simulation. Future research should focus on methods for forward quantification of R b,eff . Supplementary material: https://doi.org/10.6084/m9.figshare.c.7237887

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“…1. T Śliwa [14] studied the application of vacuum insulated tubing in deep well heat exchangers. The biggest problem in the production and development of VIT is hydrogen permeation.…”

Section: Foreign Research On Vacuum Insulated Tubingmentioning

confidence: 99%

A Review of Research Status and Prospect of Vacuum Insulated Tubing Insulation System

Yu

¹

,

Лю

²

,

Cao

³

et al. 2020

E3S Web Conf.

1

0

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Vacuum heat insulating tubing is an important wellbore heat insulating facility for heavy oil thermal recovery at present. Its heat insulating performance directly affects the thermal recovery efficiency. The research on the heat insulating system of vacuum heat insulating tubing is of great significance to improve and improve the heat insulating performance and enhance the thermal recovery of heavy oil. This paper summarizes and analyses the current research status of vacuum insulated tubing insulation system. It elaborates the insulation structure, insulation materials, annular air charging and vacuum pumping, insulation coating and so on. It provides reference and reference for the future research of vacuum insulated tubing.

show abstract

“…T Śliwa [14] studied the application of vacuum insulated tubing in deep well heat exchangers. The biggest problem in the production and development of VIT is hydrogen permeation.…”

Section: Foreign Research On Vacuum Insulated Tubingmentioning

confidence: 99%

A Review of Research Status and Prospect of Vacuum Insulated Tubing Insulation System

Lei¹,

Liu²,

Cao³

et al. 2019

dtetr

1

0

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Vacuum heat insulating tubing is an important wellbore heat insulating facility for heavy oil thermal recovery at present. Its heat insulating performance directly affects the thermal recovery efficiency. The research on the heat insulating system of vacuum heat insulating tubing is of great significance to improve and improve the heat insulating performance and enhance the thermal recovery of heavy oil. This paper summarizes and analyses the current research status of vacuum insulated tubing insulation system. It elaborates the insulation structure, insulation materials, annular air charging and vacuum pumping, insulation coating and so on. It provides reference and reference for the future research of vacuum insulated tubing. 12

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The application of Vacuum Insulated Tubing in Deep Borehole Heat Exchangers

Cited by 9 publications

References 18 publications

Generic modelling to develop thermal yield nomograms for coaxial deep borehole heat exchangers (DBHEs)

Generic modelling to develop thermal yield nomograms for coaxial deep borehole heat exchangers (DBHEs)

A Review of Research Status and Prospect of Vacuum Insulated Tubing Insulation System

A Review of Research Status and Prospect of Vacuum Insulated Tubing Insulation System

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