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Thermal Response Tests Using Optical Fiber Thermometers

Background. At Ground Heat Exchangers (GHEs) drilled in heterogeneous formations, heat exchange rates may not be uniform due the variation of ground thermal conductivity (ls) with depth.Optical fiber thermometers, which measure continuous temperature distribution along optical fiber sensors, could

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Thermal Response Tests Using Optical Fiber Thermometers

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    1. Thermal Response Tests Using Optical Fiber Thermometers September 13, 2006 Hikari FUJII, Hiroaki OKUBO, Ryuichi ITOI Graduate School of Engineering, Kyushu University, Japan

    2. Background At Ground Heat Exchangers (GHEs) drilled in heterogeneous formations, heat exchange rates may not be uniform due the variation of ground thermal conductivity (ls) with depth. Optical fiber thermometers, which measure continuous temperature distribution along optical fiber sensors, could be useful in the estimation of the distribution of ls.

    3. Contents Installation of Optical Fiber Sensors

    4. Experimental Wells and Geological Column ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????1m??50m???????????? ???????????2????????????????????????2???????Test1??~???????Test2??~?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????1m??50m???????????? ???????????2????????????????????????2???????Test1??~???????Test2??~??????????????

    5. Temperature Distribution in Co-axial and U-tube GHEs ?????????????U??????????1??????????????????????U????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????50m?????1m??50???????·??·????·???????????????????????U??????????1??????????????????????U????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????50m?????1m??50???????·??·????·??????????

    6. Temperature Distribution in U-tubes during Circulation ??????????U?????????????????????????????????????2m?????????????? Survey1????????U???Survey 2???????U??????????????? ???????????????????????U???????????????????????????????????????????????????U?????????????????????????????????????2m?????????????? Survey1????????U???Survey 2???????U??????????????? ???????????????????????U?????????????????????????????????????????

    7. ???????????1??????????????????????????????????? ??????????????????????????????????????????????????????????????? ??????????n????????????????????????????????????????????? ???????????1??????????????????????????????????? ??????????????????????????????????????????????????????????????? ??????????n?????????????????????????????????????????????

    8. Calculation of Temperature Distribution in Co-axial GHE

    9. Estimation of Thermal Conductivity ?????????????????????????U????????????????????U???????????????????????????????????????????????????????(?????????????????????????????U????????????????????????????????????????????????????????????????????????????????????????????????) ?????????????????????????U????????????????????U???????????????????????????????????????????????????????(?????????????????????????????U????????????????????????????????????????????????????????????????????????????????????????????????)

    10. Conditions of TRTs

    11. Interpretation of TRT No.1 (Co-axial, Reverse Circulation)

    12. ????????????????????????????

    13. Comparison of Estimated Thermal Conductivity

    14. Summary ?????????????????????·?????·??·?????????????????????????????????????????????????????????????·?????·??·????????????????????????????????????????

    16. Interpretation of TRT No.2 (Co-axial, Normal Circulation)

    17. Cylindrical Source Function

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