Numerical Study of Distribution Characteristics and Influencing Factors on Geo-Temperature Field of Groundwater Heat Pump

2011 ◽  
Vol 320 ◽  
pp. 536-541 ◽  
Author(s):  
Su Fen Li ◽  
Shi Yao Liu ◽  
Yan Shang ◽  
Guo Fu Du
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Numerical Model ◽  
Influencing Factors ◽  
Heat Pump ◽  
Numerical Study ◽  
Distribution Characteristics ◽  
Soil Layers ◽  
Groundwater Heat Pump

A 3-D numerical model was developed to simulate the distribution characteristics and influencing factors on geo-temperature field of groundwater heat pump. Analyzing from different soil layers, different permeability, different porosity, different inter-well distances, and different aquifer thickness, temperature distribution characteristics and variations of pumping temperature were gotten. Base on those, permeability and different porosity produce little effect to the temperature of pumping, different inter-well distances and different aquifer thickness produce great effect to the temperature of pumping.

scholarly journals Experimental and numerical study of the effect of coil structure on induction nitriding temperature field

2020 ◽  
Vol 12 (7) ◽  
pp. 168781402093848
Author(s):  
Kangjie Song ◽  
Jing Guan ◽  
Kunmao Li ◽  
Jing Liu
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Induction Heating ◽  
Current Density ◽  
Numerical Study ◽  
Radial Temperature ◽  
Current Frequency ◽  
Variable Pitch ◽  
Variable Radius ◽  
Heating Efficiency

The axial and radial temperature distributions of an induction heating workpiece considerably impact the subsequent nitriding process. To obtain a satisfactory temperature distribution, an equal pitch coil, a variable pitch coil, and a variable radius coil were designed. Furthermore, an induction heating model that exhibits electromagnetic and temperature field coupling was established; thus, the effects of the current density and frequency on the heating efficiency and temperature distribution of the workpiece were analyzed and compared. In addition, an induction heating experiment was conducted to verify the model. According to the numerical results, the variable radius coil can reduce the axial temperature difference in comparison with equal pitch coil and variable pitch coil. Hence, the workpiece heated using the variable radius coil can achieve a better temperature distribution when compared with those heated by the equal pitch coil and variable pitch coil, with appropriate current density and current frequency values.

Numerical Simulation Analysis of the Groundwater’ Temperature Field in the Concentration Area of the Water Source Heat Pump Engineering

2012 ◽  
Vol 174-177 ◽  
pp. 3027-3030
Author(s):  
Wei Wei ◽  
Ming Zhong Wang ◽  
Jun Pan
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Numerical Model ◽  
Heat Pump ◽  
Simulation Analysis ◽  
Water Source ◽  
Groundwater Temperature ◽  
Change Trend

In order to avoid the heat transfixion among users in the concentration area of the water source heat pump, a suitable layout of pumps for drawing and recharging wells is required. Finite element method is adopted to establish the numerical model of groundwater temperature to predict the change trend of water temperature. The results of the simulation indicate that the groundwater temperature change from 6.3 to 14.2 °C in winter, and from 11.5 to 21.2 °C in summer. These results meet the requirements of the drawing and recharging water in the water source heat pump engineering and are able to avoid the heat transfixion among users. The effect of drawing and recharging water in the water source heat pump engineering to the changes of the groundwater’s temperature field can be analyzed quantitatively through establishing the proper numerical simulation which provides a reference to scientifically design the layout of pumps for drawing and recharging water.

Experimental and numerical study of smoke temperature distribution characteristics in a sloped tunnel

2021 ◽  
pp. 103091
Author(s):  
Yuxuan Yang ◽  
Zeng Long ◽  
Huihang Cheng ◽  
Junfeng Chen ◽  
Chang Liu ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Numerical Study ◽  
Distribution Characteristics

scholarly journals Study on Temperature Distribution Characteristics of Condensate in Marine Condensator

2020 ◽  
Vol 185 ◽  
pp. 01089
Author(s):  
Wu Hao ◽  
Hou Yingzhe ◽  
Cui Lin
Keyword(s):  
Temperature Distribution ◽  
Numerical Model ◽  
Heat Flow ◽  
Flow Field ◽  
Steam Turbine ◽  
Flow Distribution ◽  
Distribution Characteristics ◽  
Metal Mesh

According to the structure and working principles of marine condensator, utilizing FLUNET, a numerical model of the flow field related to the hot well is established and the results were analysed. The flow field and temperature distribution characteristics of hot well with metal mesh and different heat flow distribution schemes are compared and analysed to improve the operation economy and safety of steam turbine units.

Clogging Problems in Groundwater Heat Pump Systems in Sweden

1988 ◽  
Vol 20 (3) ◽  
pp. 133-140 ◽  
Author(s):  
Annika Lindblad-Påsse
Keyword(s):  
Redox Potential ◽  
Heat Pump ◽  
Hydrogen Sulphide ◽  
Sludge Formation ◽  
Iron Bacteria ◽  
Iron Precipitation ◽  
Water Composition ◽  
Groundwater Heat Pump ◽  
And Control ◽  
System Knowledge

A number of groundwater heat pump systems have been investigated to determine the extent of problems caused by the chemistry of the groundwater used. The main purpose was to investigate sites using iron rich groundwater. Fifteen facilities were studied regularly for three years. Ten of these facilities had some kind of problem caused by iron precipitation. Four of the sites were rebuilt because of severe plugging due to iron sludge in wells, pumps and pipes. In all facilities with severe problems, iron bacteria were found. Low redox potential, indicated by hydrogen sulphide in the groundwater, seems to protect from iron bacteria. In some of the systems using groundwater with H2S the problems were corrosion and sludge formation caused by sulphur oxidizing bacteria. Rapid clogging was caused by aeration of the groundwater due to improper design of the system. Knowledge of the water composition, design of the systems to minimize aeration, and control of clogging turned out to be important factors to maintain operation safety.

Numerical Simulation of Solidification Process for a Machine Tool Bed

2011 ◽  
Vol 675-677 ◽  
pp. 987-990
Author(s):  
Ling Tang ◽  
Xu Dong Wang ◽  
Hai Jing Zhao ◽  
Man Yao
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Temperature Distribution ◽  
Machine Tool ◽  
Computation Time ◽  
Solidification Process ◽  
Field Calculation ◽  
Original Design ◽  
Calculation Results ◽  
Improved Design

In this paper, the flow, heat transfer and stress during solidification process of the machine tool bed weighed about 2.5ton that has been optimized by structural topologymethod, was calculated with ProCAST software, and the causes of the crack forming in the casting of the machine tool bed was analysed. According to the calculation results, the structural design of the local part where cracks tends to form has been improved, and the heat transfer and the stress are calculated again. By comparing the temperature field with filling of molten cast iron and without filling, it has been found that there was little effect of filling on the results of temperature distribution of the cast, therefore the effect of filling can be ignored in the following temperature field calculation to save computation time. The model has been simplified in the stress field calculation with considering the complexity of the machine tool bed and the cost of computation. Then, the merits and demerits of the original design and the improved design are compared and analyzed depending on the calculated temperature and stress results. It is suggested that the improved one could get a more uniform temperature distribution and then the trend of the crack occurring can be greatly reduced. These results could provide a guide for the actual casting production, achieving the scientific control of the production of castings, ensuring the quality of the castings.

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