Experimental Study on Thermal Balance in Soft Clay Area During GSHP Operation
Abstract
:Featured Application
Abstract
1. Introduction
2. Materials and Methods
2.1. Geology and Climate in Study Area
2.2. Experimental System Design
2.3. Model Soil Preparation
2.4. Experimental Sensors and Procedures
3. Results and Discussion
3.1. Time-Dependent Temperature Variation During the Whole Testing Process
3.2. Thermal Balance Parameter Analysis
3.3. Thermal Mattress Effect
4. Conclusions
- Temperature variation induced by summer or winter case almost linearly increase with the elevated initial temperature difference between the circulation fluid and the ambient ground soil. However, the heat transfer rate could approach a balance by heat equilibrium in heat exchange. From this aspect, higher circulation temperatures could not always result in better efficiency of GSHP system.
- From the comparison of temperature variation ratio and time ratio values in summer and winter circulations, Shanghai muddy clay is proved to be a geo-material with strong heat storage, but poor heat release ability.
- Thermal balance of heat dissipated to and extracted from muddy clay can hardly be achieved during the alternation between summer and winter cycles without other external effort and appropriate management. This is explained by the irreversible and asymmetric heat conduction characteristics based on monitoring data and also the second law of thermodynamics.
- The thermal mattress effect in muddy clay soil will potentially occur after single long-term operation of GSHP system in the absence of corresponding management and involving the environment evaluation.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Category | Details | Similarity Ratio |
---|---|---|
Model box | ||
Model | Model soil | , , , |
U-shaped tube (the ground heat exchanger) | Cross-sectional: | |
Vertical: | ||
Heat circulation system | Heat transfer parameters | , |
where q is the heat flux | ||
Output | Thermal response parameters | , , |
Soil Layer | Soil Type | Thickness (m) | (%) | |||
---|---|---|---|---|---|---|
No.3 | Muddy silt clay | 4–9 | 39.2 | 18.3 | 2.73 | 1.08 |
No.4 | Muddy clay | 12–20 | 49.9 | 17.2 | 2.74 | 1.39 |
No.5 | Silty clay | 1–4 | 34.9 | 18.4 | 2.73 | 0.99 |
Soil Type | a | |||||
---|---|---|---|---|---|---|
No.3 | Muddy silt clay | 0.59 | 0.28 | 1.34 × 10−7 | 16 | 18.0 |
No.4 | Muddy clay | 1.01 | 0.42 | 4.22 × 10−8 | 13 | 10.0 |
No.5 | Silty clay | 0.49 | 0.25 | 3.84 × 10−6 | 16 | 14.5 |
TS Series | 1 | 2 | 3 | 4 | 5 | |
---|---|---|---|---|---|---|
Elevation No. | ||||||
Initial temperature (°C) | 1 | 16.78 | 16.8 | 16.47 | 16.37 | 16.84 |
2 | 16.83 | 16.98 | 16.67 | 16.44 | 16.03 | |
3 | 16.91 | 16.61 | 17.27 | 16.91 | 16.4 | |
4 | 17.45 | 17.23 | 16.63 | 17.12 | 16.95 |
TS Number a | Temperature Variation Ratio b | Time Ratio | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Summer Case (°C) | Winter Case (°C) | Summer Case (35 °C) | Winter Case (0 °C) | |||||||
35 | 40 | 45 | 50 | 5 | 0 | −5 | −10 | |||
2-3 | 0.413 | 0.418 | 0.394 | 0.362 | 0.215 | 0.217 | 0.211 | 0.181 | 0.753 | 0.500 |
3-3 | 0.257 | 0255 | 0.244 | 0.219 | 0.120 | 0.121 | 0.120 | 0.110 | 0.788 | 0.655 |
4-3 | 0.118 | 0.117 | 0.118 | 0.095 | 0.030 | 0.032 | 0.032 | 0.026 | 0.883 | 0.750 |
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Zhou, J.; Tang, Y.; Wan, P.; Li, Z.; Wang, C. Experimental Study on Thermal Balance in Soft Clay Area During GSHP Operation. Appl. Sci. 2019, 9, 1764. https://doi.org/10.3390/app9091764
Zhou J, Tang Y, Wan P, Li Z, Wang C. Experimental Study on Thermal Balance in Soft Clay Area During GSHP Operation. Applied Sciences. 2019; 9(9):1764. https://doi.org/10.3390/app9091764
Chicago/Turabian StyleZhou, Jie, Yiqun Tang, Peng Wan, Zeyao Li, and Chuanhe Wang. 2019. "Experimental Study on Thermal Balance in Soft Clay Area During GSHP Operation" Applied Sciences 9, no. 9: 1764. https://doi.org/10.3390/app9091764