Numerical simulation of vertical ground heat exchangers: Intermittent operation in unsaturated soil conditions
► The effect of depth varying thermal properties on the vertical GHE was simulated. ► An intermittent operation of GHE was modeled using transient FEM. ► A three-phase soil model was used to introduce soil properties that vary with depth. ► Unsaturated soil cases afforded a 40% lower performance tha...
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| Published in | Computers and geotechnics Vol. 38; no. 8; pp. 949 - 958 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
01.12.2011
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| Abstract | ► The effect of depth varying thermal properties on the vertical GHE was simulated. ► An intermittent operation of GHE was modeled using transient FEM. ► A three-phase soil model was used to introduce soil properties that vary with depth. ► Unsaturated soil cases afforded a 40% lower performance than saturated conditions. ► This demonstrates the importance of considering unsaturated conditions in the design of GHEs.
The effect of varying the thermal properties of inhomogeneous unsaturated soil on the intermittent operation of a vertical ground heat exchanger (GHE) was simulated by a conjugate heat transfer simulation using a transient conductive heat transfer model. A three-phase soil model was used to introduce soil properties that vary with depth. The performance during the first few hours was significantly different from that of an analytical infinite line source model that assumes steady-state borehole conditions, although relatively good agreement was obtained thereafter. Unsaturated soil conditions afforded a 40% lower mean heat exchange rate than saturated conditions. This demonstrates the importance of considering unsaturated conditions in the design and performance evaluation of GHEs. |
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| AbstractList | The effect of varying the thermal properties of inhomogeneous unsaturated soil on the intermittent operation of a vertical ground heat exchanger (GHE) was simulated by a conjugate heat transfer simulation using a transient conductive heat transfer model. A three-phase soil model was used to introduce soil properties that vary with depth. The performance during the first few hours was significantly different from that of an analytical infinite line source model that assumes steady-state borehole conditions, although relatively good agreement was obtained thereafter. Unsaturated soil conditions afforded a 40% lower mean heat exchange rate than saturated conditions. This demonstrates the importance of considering unsaturated conditions in the design and performance evaluation of GHEs. ► The effect of depth varying thermal properties on the vertical GHE was simulated. ► An intermittent operation of GHE was modeled using transient FEM. ► A three-phase soil model was used to introduce soil properties that vary with depth. ► Unsaturated soil cases afforded a 40% lower performance than saturated conditions. ► This demonstrates the importance of considering unsaturated conditions in the design of GHEs. The effect of varying the thermal properties of inhomogeneous unsaturated soil on the intermittent operation of a vertical ground heat exchanger (GHE) was simulated by a conjugate heat transfer simulation using a transient conductive heat transfer model. A three-phase soil model was used to introduce soil properties that vary with depth. The performance during the first few hours was significantly different from that of an analytical infinite line source model that assumes steady-state borehole conditions, although relatively good agreement was obtained thereafter. Unsaturated soil conditions afforded a 40% lower mean heat exchange rate than saturated conditions. This demonstrates the importance of considering unsaturated conditions in the design and performance evaluation of GHEs. |
| Author | Lee, Dae Soo Choi, Jung Chan Lee, Seung Rae |
| Author_xml | – sequence: 1 givenname: Jung Chan surname: Choi fullname: Choi, Jung Chan organization: Dept. of Civil and Environmental Engineering, KAIST, Daejeon 305-701, Republic of Korea – sequence: 2 givenname: Seung Rae surname: Lee fullname: Lee, Seung Rae email: srlee@kaist.ac.kr organization: Dept. of Civil and Environmental Engineering, KAIST, Daejeon 305-701, Republic of Korea – sequence: 3 givenname: Dae Soo surname: Lee fullname: Lee, Dae Soo organization: Korea Electric Power Research Institute, Daejeon 305-308, Republic of Korea |
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| Keywords | Numerical simulation Intermittent operation Ground heat exchanger Unsaturated soil Ground source heat pump |
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| Snippet | ► The effect of depth varying thermal properties on the vertical GHE was simulated. ► An intermittent operation of GHE was modeled using transient FEM. ► A... The effect of varying the thermal properties of inhomogeneous unsaturated soil on the intermittent operation of a vertical ground heat exchanger (GHE) was... |
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| SubjectTerms | Computer simulation Conjugates Ground heat exchanger Ground source heat pump Grounds Heat exchange Heat exchangers Intermittent operation Mathematical models Numerical simulation Soil (material) Unsaturated Unsaturated soil |
| Title | Numerical simulation of vertical ground heat exchangers: Intermittent operation in unsaturated soil conditions |
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