The Simulation Study on Buried Ground-Source Heat Pipe Transient Temperature Field Distribution

2011 ◽  
Vol 383-390 ◽  
pp. 6621-6625
Author(s):  
Chang Sheng Guan ◽  
Zhao Wan
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Field Distribution ◽  
Optimization Design ◽  
Transient Temperature ◽  
Transfer Model ◽  
Temperature Field Distribution ◽  
Heat Transfer Efficiency ◽  
Ground Source ◽  
Coefficient Of Thermal Conductivity

In order to provides the theory basis for the optimization design of ground source heat pump underground U-shaped buried tube, ANSYS software was used to simulate the temperature field distribution of GSHP buried tube summer cooling process. The dynamic simulation was base on analyzing the GSHP heat exchanger unsteady heat transfer model. Comparing the temperature field distribution radius in different soil heat transfer rate, the simulation results show that the buried tube heat transfer efficiency increases with soil coefficient of thermal conductivity, soil hot effect radius increased over time and tend to be gentle.

Numerical Simulating the Ground Coefficient of Thermal Conductivity in Severe Cold Region

2014 ◽  
Vol 960-961 ◽  
pp. 366-369 ◽  
Author(s):  
Li Bai ◽  
Yan Wang ◽  
Ya Wei Hua
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Temperature Field ◽  
Ground Temperature ◽  
Actual Data ◽  
Transfer Model ◽  
Cold Region ◽  
Unsteady Heat Transfer ◽  
Buried Pipe ◽  
Coefficient Of Thermal Conductivity

The ground coefficient of thermal conductivity is one of the most important parameters of simulating the ground temperature field. The ground coefficient of thermal conductivity of the severe cold region is investigated in this article. Firstly, calculating the ground thermal conductivity with considering the moisture content and porosity; then measuring the thermal conductivity of the 1.5 Meter depth; finally, simulating the unsteady heat transfer model of the shallow buried pipe and the ground with the Matlab software; it founded that the calculation data and the actual data differ only 0.31,but the corresponding ground temperature field vary widely. Thus, it can be concluded that the more precise temperature field of the ground can be simulated with the actual data of ground coefficient of thermal conductivity.

Random Heat Temperature Field Model Analysis on Buried Pipe of Ground Source Heat Pump

2011 ◽  
Vol 383-390 ◽  
pp. 6626-6631
Author(s):  
Cheng Ju Huang ◽  
Chang Sheng Guan ◽  
Kai Xia
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Heat Pump ◽  
Design Theory ◽  
Transfer Model ◽  
Ground Source Heat Pump ◽  
Buried Pipe ◽  
Reliability Design ◽  
Ground Source ◽  
Temperature Field Model

The random properties on buried pipe of ground-source heat pump (GSHP) is analyzed, the equation of Kelvin one-dimensional line source of heat transfer model is discussed. The model randomness is analyzed also, and the GSHP buried pipe to random excess temperature field, space-time statistics and the correlation of features are studied. The engineering example shows that heat transfer in buried pipe has relationship with the distance from the pipe center and run time of the system, and also the heat transfer between buried pipes can not be ignored. The method in this paper has great significance for improving the reliability design theory and reducing the construction cost of GSHP buried pipe in this paper.

Research on Temperature Field Distribution of Heavy Hydrostatic Thrust Bearing Rotation-Workbench at Different Rotating Velocity

2011 ◽  
Vol 239-242 ◽  
pp. 2703-2706
Author(s):  
Jun Peng Shao ◽  
Xiao Dong Yang ◽  
Yun Fei Wang ◽  
Xiao Qiu Xu ◽  
Yan Qin Zhang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Temperature Field ◽  
Field Distribution ◽  
Thrust Bearing ◽  
State Equation ◽  
Temperature Field Distribution ◽  
Hydrostatic Bearing ◽  
Average Temperature ◽  
Heat Transfer Theory

Based on heat transfer theory, thermodynamics steady state equation of hydrostatic bearing, thermal mathematical model of hydrostatic bearing and boundary condition of numerical simulation is established. Temperature field distribution of hydrostatic bearing at different velocity is numerical simulated. Regularity of the influence of velocity on temperature field of heavy hydrostatic thrust bearing is revealed. The results show that, velocity impacted a significant influence on heat transfer and temperature field distribution of hydrostatic bearing. Average temperature of workbench steadily declined as velocity increasing, while average temperature of base gradually increased; both of them emerged serious heat concentration, but the cooling situation of workbench is better than base. The numerical simulation results could provide theoretical basis for temperature control scheme design which will improve the stability and reliability during hydrostatic bearing operation.

Thermal Imaging Experimental Research on Temperature Field for Milling Insert

2008 ◽  
Vol 392-394 ◽  
pp. 924-928 ◽  
Author(s):  
Yu Hua Zhang ◽  
Guang Yu Tan ◽  
Guang Jun Liu
Keyword(s):  
Temperature Field ◽  
Field Distribution ◽  
Experimental Research ◽  
Optimization Design ◽  
Failure Modes ◽  
Thermal Imager ◽  
Temperature Field Distribution ◽  
Interrupted Cutting ◽  
The Difference ◽  
Infrared Thermal Imager

During the process of interrupted cutting, milling insert suffers from periodic thermal shock. The bad temperature field caused by cutting heat is the direct reason for tool failure. In order to get more accurate temperature field distribution of milling insert, the experimental research on temperature field is carried on with the FLIR infrared thermal imager. This paper takes hard cutting material 3Cr1Mo1/4V as example. Through the contrast experiments, the temperature field distribution of tool-chip contact area is gained at the moment of milling insert going into or out from the workpiece, and also the difference of failure modes among different milling inserts is revealed. The experimental analysis results show that more accurate distribution of temperature field will be obtained when we apply the infrared thermal imager to observe temperature field during interrupted cutting process. Optimization design for groove of milling insert also can be based on those results.

Simultaneous stable control of temperature field distribution uniformity and consistency for multi-temperature zone systems

2021 ◽  
pp. 014233122198984
Author(s):  
Xiaoyue Sang ◽  
Zhaohui Yuan ◽  
Xiaojun Yu ◽  
GaoXi Xiao ◽  
Muhammad Tariq Sadiq ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Field Distribution ◽  
Predictive Control ◽  
Control Mechanism ◽  
Control Method ◽  
Temperature Zone ◽  
Temperature Field Distribution ◽  
Distribution Uniformity ◽  
Stable Control

As a key factor characterizing the control accuracy of multi-temperature zone systems (MTZSs), the stable control of temperature field distribution uniformity and consistency is of critical importance for MTZSs, and it largely determines the product quality and production efficiency. Due to the complicated multiple input and output properties, as well as the various external variations in practice, however, it is extremely difficult to monitor the temperature field distribution in production process. To address the uniform and consistent temperature field distribution problem in MTZSs, a multi-variable dynamic matrix control (DMC)-based predictive control mechanism is proposed in this paper. Specifically, we first establish a finite element-based heat transfer model to analyse heat transfer within the multi-temperature zone, and then propose a multi-variable DMC-based decoupling design method to decompose the entire system into multiple subsystems with single-input single-output for temperature uniformity distribution control in MTZS. By utilizing the ANSYS tools to analyse the transient field temperatures, we obtain both time and space distribution characteristics of the transient temperature field with the proposed control method, and also compare such results with those obtained using the PID control method. Finally, we apply the proposed multi-variable DMC control mechanism onto a multi-temperature sintering furnace of a practical industrial product line for verification. Results show that, with the proposed control mechanism adopted, the difference between the highest and lowest temperature of any workpiece could be maintained within 5°C in the heat rising up period, which convincingly verifies the effectiveness of the proposed predictive control algorithm in different cases.

scholarly journals Three-Dimensional Electro-Thermal Analysis of a New Type Current Transformer Design for Power Distribution Networks

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1792
Author(s):  
Bingbing Dong ◽  
Yu Gu ◽  
Changsheng Gao ◽  
Zhu Zhang ◽  
Tao Wen ◽  
...  
Keyword(s):  
Boundary Condition ◽  
Temperature Field ◽  
Temperature Gradient ◽  
Field Distribution ◽  
Distribution Network ◽  
Current Transformer ◽  
Internal Temperature ◽  
Temperature Field Distribution ◽  
Type Design ◽  
New Type

In recent years, the new type design of current transformer with bushing structure has been widely used in the distribution network system due to its advantages of miniaturization, high mechanical strength, maintenance-free, safety and environmental protection. The internal temperature field distribution is an important characteristic parameter to characterize the thermal insulation and aging performance of the transformer, and the internal temperature field distribution is mainly derived from the joule heat generated by the primary side guide rod after flowing through the current. Since the electric environment is a transient field and the thermal environment changes slowly with time as a steady field under the actual conditions, it is more complex and necessary to study the electrothermal coupling field of current transformer (CT). In this paper, a 3D simulation model of a new type design of current transformer for distribution network based on electric-thermal coupling is established by using finite element method (FEM) software. Considering that the actual thermal conduction process of CT is mainly by conduction, convection and radiation, three different kinds of boundary conditions such as solid heat transfer boundary condition, heat convection boundary condition and surface radiation boundary condition are applied to the CT. Through the model created above, the temperature rise process and the distribution characteristics of temperature gradient of the inner conductor under different current, different ambient temperatures and different core diameters conditions are studied. Meanwhile, the hottest temperature and the maximum temperature gradient difference are calculated. According to this, the position of weak insulation of the transformer is determined. The research results can provide a reference for the factory production of new type design of current transformer.

scholarly journals The study of three-dimensional temperature field distribution reconstruction using ultrasonic thermometry

AIP Advances ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 075007 ◽  
Author(s):  
Ruixi Jia ◽  
Qingyu Xiong ◽  
Kai Wang ◽  
Lijie Wang ◽  
Guangyu Xu ◽  
...  
Keyword(s):  
Temperature Field ◽  
Field Distribution ◽  
Three Dimensional ◽  
Temperature Field Distribution
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