A Study on the Calculation Model of Rock Soil Thermal Conductivity in the Design of the Ground Source Heat Pump System

2014 ◽  
Vol 889-890 ◽  
pp. 1347-1352
Author(s):  
Hong Wen Jin ◽  
Qing Shen Fang
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Heat Pump ◽  
Soil Layer ◽  
Heat Extraction ◽  
Ground Source Heat Pump ◽  
Soil Thermal Conductivity ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source

The rock soil thermal conductivity is the most important design parameter for the ground source heat pump system. Based on the equation applied for the heat transfer between the geothermal heat exchanger and its surrounding rock soil, a quasi-three dimensional heat conduction model showing the heat transfer inside the borehole of the U-tube was established to determine the thermal conductivity of the deep-layer rock soil. The results obtained show that the average thermal conductivity got through calculation and actual determination in a tube-embedding region of the ground source heat pump engineering were 1.895 and 1.955W/(m·°C), respectively. The soil layer, which has a great thermal conductivity and a strong integrated heat transfer capability, is suitable for the use of the ground source heat pump system with the tubes embedded underground. The soil layer, with a body temperature of 19 °C and a higher initial temperature, is suitable for the heat extraction from underground in winter. The deviation between the calculation and the determination of the average thermal conductivity in the abovementioned region was 0.06, which could meet the required precision, indicating that the results from the calculation could be used for design.

Improvement of Transductive Support Vector Machine and its Application to Enhance Antifreeze Heat Transfer Capability in Ground Source Heat Pump System

2012 ◽  
Vol 204-208 ◽  
pp. 4349-4355
Author(s):  
Man Fu Yan ◽  
Jiu Hai Wang
Keyword(s):  
Heat Transfer ◽  
Support Vector Machine ◽  
Heat Pump ◽  
Support Vector ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Transfer Capability ◽  
Heat Transfer Capability

To solve the problem of enhancing the heat transfer capability of antifreeze mixture in a ground source heat pump system, the existing Transductive Support Vector Machine (TSVM) model was updated into an improved TSVM model. Also, a new method of mixed antifreeze heat transfer capability classification was given in the paper by analyzing antifreeze [1] heat transfer capability of the ground source heat pump system and applying the improved TSVM model.

3D Numerical Simulation of Heat Transfer for the Vertical U Type Berried Pipe of the Ground Source Heat Pump

2013 ◽  
Vol 827 ◽  
pp. 203-208
Author(s):  
Yang Zhang ◽  
Yong Feng Qi
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Finite Element ◽  
Heat Pump ◽  
Element Model ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Heat Transfer Theory

Based on transient heat transfer theory and finite element method, a 3D finite element model was created to simulate the heat transfer of the vertical U type berried pipe of the ground source heat pump system. At the same time, the pipe algorithm applied successfully in the numerical simulation of concrete temperature field was introduced. The corresponding program was written. Taking the true experiment conditions as the input data and boundary condition of the computation model, the 3D dynamic simulation of the heat transfer between the berried pipe and sandy soil was carried out. The calculated temperatures of the output water of the pipe and the measure points in soil at different times met the experiment results very well, which verified the effectiveness and the reliability of the algorithm and the model. Beneficial exploration is made for providing more detailed and accurate data for the designer.

scholarly journals The Solar-Assisted Vertical Ground Source Heat Pump System in Cold Climates—A Case Study

Proceedings ◽  
2020 ◽  
Vol 51 (1) ◽  
pp. 24
Author(s):  
Piotr Rynkowski
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Solar Collector ◽  
Heat Extraction ◽  
Ground Heat Exchanger ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Vertical Ground

In this paper, experimental studies were performed for a solar ground source heat pump system (SGSHPS) with a vertical ground heat exchanger (VGHE). The experiment was operated during the summer in 2018. The heat from the solar collector was monitored by measuring the inlet and outlet temperatures and flow rate of the heat transfer fluids. An energy equilibrium balance carried out indicates heat extraction from the solar collector to the ground heat exchanger. It has been established that clear impact is achieved within a radius of 5 m. The average temperature of the actively regenerated borehole was higher than that of the undisturbed profile, which has a direct impact on the significant benefits of the coefficient of performance (COP) of the ground source heat pump system (GSHPS) and effectively helps soil regeneration. The average efficiency ratio of the heat transferred from solar radiation to soil in the SGSHPS was 42.3%.

Improvement of Proximal Support Vector Machine and its Application to Enhance Antifreeze Heat Transfer Capability in Ground Source Heat Pump System

2012 ◽  
Vol 594-597 ◽  
pp. 2186-2191
Author(s):  
Jiu Hai Wang ◽  
Man Fu Yan
Keyword(s):  
Heat Transfer ◽  
Heat Pump ◽  
Support Vector ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Proximal Support Vector Machine ◽  
Transfer Capability ◽  
Heat Transfer Capability

To solve the problem of enhancing the heat transfer capability of antifreeze mixture in a ground source heat pump system, the existing proximal support vector machines [1] was updated into a weighted Proximal Support Vector Machine (PSVM) model. Also, a new classification method of mixed antifreeze heat transfer capability was given in the paper by analyzing antifreeze [2] heat transfer capability of the ground source heat pump system and applying the weighted PSVM mode.

Study on Operation Strategies of a Hybrid Ground-Source Heat Pump System with Surface Water Heat Exchangers for an Exhibition Building

2014 ◽  
Vol 672-674 ◽  
pp. 436-440
Author(s):  
Yu Dai Liu ◽  
Guo Xia Hu ◽  
Yan Qu
Keyword(s):  
Surface Water ◽  
Heat Pump ◽  
Heat Exchangers ◽  
High Efficiency ◽  
Heat Extraction ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Term Operation ◽  
Ground Source

In this study, a hybrid ground-source heat pump (GSHP) system with surface water heat exchangers is employed in an exhibition building in Shanghai to provide with high-efficiency energy for space cooling and heating and also solve the problem of thermal imbalance of the soil because of a significant imbalance between the annual heat rejection to the ground and the annual heat extraction from the ground. The operation strategies were put forward based on the annual building hourly load to make the hybrid GSHP system in a high-efficiency status during the long-term operation. The results show that the hybrid GSHP system can effectively solve the heat accumulation problem and decrease in system performance for the ten-year long run.

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