Measurement and Prediction of Undisturbed Underground Temperature Distribution

2011 ◽  
Author(s):  
Wenzhi Cui ◽  
Quan Liao ◽  
Guiqin Chang ◽  
Guanghai Chen ◽  
Qingyuan Peng ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Geothermal Energy ◽  
Southwest China ◽  
Geothermal Gradient ◽  
Ground Temperature ◽  
Underground Space ◽  
Temperature Zone ◽  
Shallow Geothermal Energy ◽  
Development And Utilization ◽  
Good Agreement

The underground temperature distribution and variation are important for the development and utilization of shallow geothermal energy and underground space. In this paper, a remote ground temperature monitoring system was established in Chongqing, located in southwest China and the ground temperature distribution and its variation with seasons of the 100m underground depth was measured from June 2010 to June 2011. The results show that, in the typical geo-structure of Chongqing, the variational ground temperature zone is from 0m to 10m, where the ground temperature is strongly affected by the change of ambient temperature. Below 11m depth, the ground temperature does not change with seasons, i.e., it is the constant ground temperature zone. In the constant temperature zone below 40 meter depth, the geothermal gradient is about 0.02°C/m. Baggs’s empirical formula was applied to predict the ground temperature distribution history at different ground depths. The results show a good agreement with the measured data.

Experimental Study on Pumping and Recharging of Groundwater-Source Heat Pump System in Fuzhou Basin

2013 ◽  
Vol 805-806 ◽  
pp. 574-579
Author(s):  
Chuan Yang Su ◽  
Gang Chen ◽  
Qing Zhang
Keyword(s):  
Heat Pump ◽  
Geothermal Energy ◽  
Design Parameters ◽  
Pump System ◽  
Heat Pump System ◽  
Well Spacing ◽  
Hydrogeological Characteristics ◽  
Shallow Geothermal Energy ◽  
Development And Utilization ◽  
Groundwater Source

Groundwater-source heat pump is a new kind of energy conservation and environmental protection air conditioning technology, which is playing a significant role in the development and utilization of the shallow geothermal energy.This paper takes Fuzhou basin as the research object, analyses its regional hydrogeological characteristics, finding Min River terrace and plains are the suitable areas to carry out the tests. On the basis of pumping and recharging experiments, the paper works out the recharging ability, the suitable pumping and recharging wells quantitative proportion of Fuzhou basin main aquifers and the well spacing design parameters between pumping and recharging wells, which provides some scientific evidences for the development of shallow geothermal energy and for the rational application of groundwater-source heat pump technology.

Zonation for Development of Shallow Geothermal Energy in Urban Area of Kaifeng City and some Relevant Suggestions

2014 ◽  
Vol 587-589 ◽  
pp. 355-360
Author(s):  
Chao Jun Yue ◽  
Zhan Shi Liu
Keyword(s):  
Heat Exchange ◽  
Urban Area ◽  
Geothermal Energy ◽  
Comprehensive Evaluation ◽  
Research Result ◽  
Exchange System ◽  
Heat Exchange System ◽  
Shallow Geothermal Energy ◽  
Development And Utilization ◽  
Kaifeng City

Through studying the current development condition of shallow geothermal energy in urban area of Kaifeng City and the corresponding data of geological exploration, by taking into account the various factors influencing the applicability of different heat exchange systems, and by means of GIS and AHP, a comprehensive evaluation and preliminary zonation for the development of shallow geothermal energy in urban Kaifeng are carried out . The research result indicates that the development of ground heat exchange system in the whole urban area of Kaifeng City is feasible and applicable. Furthermore, some suggestions about the development and utilization of shallow geothermal energy in the area are put forward.

scholarly journals Simulation of Thermal and Electric Field Distribution in Packaged Sausages Heated in a Stationary Versus a Rotating Microwave Oven

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1622
Author(s):  
Wipawee Tepnatim ◽  
Witchuda Daud ◽  
Pitiya Kamonpatana
Keyword(s):  
Temperature Distribution ◽  
Electric Field ◽  
Three Dimensional ◽  
Development Stage ◽  
Microwave Oven ◽  
Computational Time ◽  
Plastic Package ◽  
Heating Uniformity ◽  
The Cost ◽  
Good Agreement

The microwave oven has become a standard appliance to reheat or cook meals in households and convenience stores. However, the main problem of microwave heating is the non-uniform temperature distribution, which may affect food quality and health safety. A three-dimensional mathematical model was developed to simulate the temperature distribution of four ready-to-eat sausages in a plastic package in a stationary versus a rotating microwave oven, and the model was validated experimentally. COMSOL software was applied to predict sausage temperatures at different orientations for the stationary microwave model, whereas COMSOL and COMSOL in combination with MATLAB software were used for a rotating microwave model. A sausage orientation at 135° with the waveguide was similar to that using the rotating microwave model regarding uniform thermal and electric field distributions. Both rotating models provided good agreement between the predicted and actual values and had greater precision than the stationary model. In addition, the computational time using COMSOL in combination with MATLAB was reduced by 60% compared to COMSOL alone. Consequently, the models could assist food producers and associations in designing packaging materials to prevent leakage of the packaging compound, developing new products and applications to improve product heating uniformity, and reducing the cost and time of the research and development stage.

Measurements of the Initial Ground Temperature in GSHP System

2014 ◽  
Vol 919-921 ◽  
pp. 1707-1715
Author(s):  
Ya Su Zhou ◽  
Wan Lan Ju ◽  
Zheng Liu
Keyword(s):  
Temperature Distribution ◽  
Small Difference ◽  
Engineering Application ◽  
Ground Temperature ◽  
Engineering Applications ◽  
Average Water Temperature ◽  
Arithmetic Average ◽  
Testing Method ◽  
Shallow Zone ◽  
The Mean

The initial ground temperature (IGT) is one of the most important parameters in designing a ground source heat pump (GSHP) system and evaluating its performance. In this paper, three initial ground temperature test methods are introduced. Except the shallow zone, the ground temperature distribution measured from direct and indirect testing method has very small difference. In direct test, the temperature sensor must be embedded when burying the tube in the borehole which is hard to operate in engineering applications. Thus the direct testing method is suggested to be applied in the scientific research. The indirect testing method could be used in engineering applications. The mean ground temperature could be calculated from temperature distribution except the shallow zone temperature. The results from three calculating methods have a quite small difference. Therefore, the arithmetic average method is suggested for scientific and engineering application to calculate the mean ground temperature. The mean ground temperature is also gotten in TRT conveniently. In the condition of velocity 0.7m/s, water was circulated in the tube system with no heat source for 30 minutes. The average water temperature could be regard as the mean ground temperature with sufficient accuracy.

scholarly journals Deep Geothermal Heating Potential for the Communities of the Western Canadian Sedimentary Basin

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 706
Author(s):  
Jacek Majorowicz ◽  
Stephen E. Grasby
Keyword(s):  
British Columbia ◽  
Northwest Territories ◽  
Geothermal Energy ◽  
Sedimentary Basin ◽  
Electrical Power ◽  
Foreland Basin ◽  
Geothermal Gradient ◽  
Energy Potential ◽  
Western Canada Sedimentary Basin ◽  
Geothermal Heating

We summarize the feasibility of using geothermal energy from the Western Canada Sedimentary Basin (WCSB) to support communities with populations >3000 people, including those in northeastern British Columbia, southwestern part of Northwest Territories (NWT), southern Saskatchewan, and southeastern Manitoba, along with previously studied communities in Alberta. The geothermal energy potential of the WCSB is largely determined by the basin’s geometry; the sediments start at 0 m thickness adjacent to the Canadian shield in the east and thicken to >6 km to the west, and over 3 km in the Williston sub-basin to the south. Direct heat use is most promising in the western and southern parts of the WCSB where sediment thickness exceeds 2–3 km. Geothermal potential is also dependent on the local geothermal gradient. Aquifers suitable for heating systems occur in western-northwestern Alberta, northeastern British Columbia, and southwestern Saskatchewan. Electrical power production is limited to the deepest parts of the WCSB, where aquifers >120 °C and fluid production rates >80 kg/s occur (southwestern Northwest Territories, northwestern Alberta, northeastern British Columbia, and southeastern Saskatchewan. For the western regions with the thickest sediments, the foreland basin east of the Rocky Mountains, estimates indicate that geothermal power up to 2 MWel. (electrical), and up to 10 times higher for heating in MWth. (thermal), are possible.

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