Horner plot을 이용한 열응답 실험 해석
Application of the Horner plot method in thermal response test interpretation
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The selection of TRT and its interpretation method are important to design an economical geothermal heat pump system because heat exchange rate of a borehole heat exchanger system highly depends on effective thermal conductivity of ground.Two thermal response tests (TRTs) are performed in a 200 m long vertical closed-loop borehole heat exchanger, and thermal conductivities are estimated with a conventional method using the line source theory, and the Horner plot method. The Horner plot method is applied to recovered circulation fluid temperatures during fluid circulation after power shut-in, and recovered ground temperatures were measured by a fiber optic temperature sensing method. The estimated thermal conductivity using the conventional method is 2.75W/m/K, and that using the Horner plot method is 2.87 W/m/K. The average effective thermal conductivity using the Horner plot method with fiber optic temperature sensing data is 2.88 W/m/K and the average core sample thermal conductivity measured in a lab is 2.90 W/m/K. By comparison of each results with core thermal conductivity data, three different interpretation methods show reliable results.
Abstract
The selection of TRT and its interpretation method are important to design an economical geothermal heat pump system because heat exchange rate of a borehole heat exchanger system highly depends on effective thermal conductivity of ground.Two thermal response tests (TRTs) are performed in a 200 m long vertical closed-loop borehole heat exchanger, and thermal conductivities are estimated with a conventional method using the line source theory, and the Horner plot method. The Horner plot method is applied to recovered circulation fluid temperatures during fluid circulation after power shut-in, and recovered ground temperatures were measured by a fiber optic temperature sensing method. The estimated thermal conductivity using the conventional method is 2.75W/m/K, and that using the Horner plot method is 2.87 W/m/K. The average effective thermal conductivity using the Horner plot method with fiber optic temperature sensing data is 2.88 W/m/K and the average core sample thermal conductivity measured in a lab is 2.90 W/m/K. By comparison of each results with core thermal conductivity data, three different interpretation methods show reliable results.
참고문헌 (28)
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