Transport mechanisms within thermally-shocked region of an enhanced geothermal system (egs)

Kamran Jahan Bakhsh, Masami Nakagawa, Mahmood Arshad, Lucila Dunnington

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

There is a consensus regarding the beneficial effects of thermally induced cracks in an EGS reservoir. Thermally induced cracks have proven to aid reservoir performance, hydrologically and thermally by lowering the flow impedance and increasing heat exchange surface area respectively. The commonly-practiced engineering approach neglects the benefits of the thermal cracks by excluding them from reservoir simulation. By ignoring the existence of thermally induced cracks, progress towards understanding the mechanism and extent of their contribution is hindered. This paper investigates the transport mechanism within a thermally-shocked region of the EGS reservoir to address the thermal crack contribution in a reservoir's performance. A porous medium with different length scales is recommended to simulate heat and mass transport within the thermally fractured region. The role of diffusion and convection in both heat and mass transport for the generated porous medium is discussed. The analysis shows that depending upon the degree of fragmentation of the thermally-fractured region, transport mechanisms will be different. A numerical example shows that for porous media, the heat and mass transport mechanisms change when the pore's length scale changes. The finding challenges the accepted notion that heat and mass transport are analogous on varying scales.

Original languageEnglish
Title of host publicationGeothermal Energy Here and Now
Subtitle of host publicationSustainable, Clean, Flexible - Geothermal Resources Council 2016 Annual Meeting
PublisherGeothermal Resources Council
Pages335-343
Number of pages9
ISBN (Electronic)0934412219
Publication statusPublished - Jan 1 2016
EventGeothermal Resources Council 2016 Annual Meeting - Geothermal Energy Here and Now: Sustainable, Clean, Flexible, GRC 2016 - Sacramento, United States
Duration: Oct 23 2016Oct 26 2016

Publication series

NameTransactions - Geothermal Resources Council
Volume40
ISSN (Print)0193-5933

Other

OtherGeothermal Resources Council 2016 Annual Meeting - Geothermal Energy Here and Now: Sustainable, Clean, Flexible, GRC 2016
CountryUnited States
CitySacramento
Period10/23/1610/26/16

Fingerprint

mass transport
crack
cracks
heat
porous medium
Cracks
Mass transfer
Porous materials
fragmentation
convection
surface area
enhanced geothermal system
Hot Temperature
impedance
engineering
porosity
simulation

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Geophysics

Cite this

Bakhsh, K. J., Nakagawa, M., Arshad, M., & Dunnington, L. (2016). Transport mechanisms within thermally-shocked region of an enhanced geothermal system (egs). In Geothermal Energy Here and Now: Sustainable, Clean, Flexible - Geothermal Resources Council 2016 Annual Meeting (pp. 335-343). (Transactions - Geothermal Resources Council; Vol. 40). Geothermal Resources Council.

Transport mechanisms within thermally-shocked region of an enhanced geothermal system (egs). / Bakhsh, Kamran Jahan; Nakagawa, Masami; Arshad, Mahmood; Dunnington, Lucila.

Geothermal Energy Here and Now: Sustainable, Clean, Flexible - Geothermal Resources Council 2016 Annual Meeting. Geothermal Resources Council, 2016. p. 335-343 (Transactions - Geothermal Resources Council; Vol. 40).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bakhsh, KJ, Nakagawa, M, Arshad, M & Dunnington, L 2016, Transport mechanisms within thermally-shocked region of an enhanced geothermal system (egs). in Geothermal Energy Here and Now: Sustainable, Clean, Flexible - Geothermal Resources Council 2016 Annual Meeting. Transactions - Geothermal Resources Council, vol. 40, Geothermal Resources Council, pp. 335-343, Geothermal Resources Council 2016 Annual Meeting - Geothermal Energy Here and Now: Sustainable, Clean, Flexible, GRC 2016, Sacramento, United States, 10/23/16.
Bakhsh KJ, Nakagawa M, Arshad M, Dunnington L. Transport mechanisms within thermally-shocked region of an enhanced geothermal system (egs). In Geothermal Energy Here and Now: Sustainable, Clean, Flexible - Geothermal Resources Council 2016 Annual Meeting. Geothermal Resources Council. 2016. p. 335-343. (Transactions - Geothermal Resources Council).
Bakhsh, Kamran Jahan ; Nakagawa, Masami ; Arshad, Mahmood ; Dunnington, Lucila. / Transport mechanisms within thermally-shocked region of an enhanced geothermal system (egs). Geothermal Energy Here and Now: Sustainable, Clean, Flexible - Geothermal Resources Council 2016 Annual Meeting. Geothermal Resources Council, 2016. pp. 335-343 (Transactions - Geothermal Resources Council).
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