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An Analysis of the Numerical Model Influence on the ground temperatureprofile Determination

Journal of Thermal Science 2017年第1期26卷 82-88页

作者： Marek Jaszczur Inga Polepszyc Aneta Sapinska-Sliwa Andrzej Gonet Faculty of Energy and Fuels Department of Fundamental Research in Energy Engineering Faculty of Drilling Oil and Gas ale Department of Drilling and Geoengineering AGH University of Science and Technology al. Mickiewicza 30 30-059 Krak6w Poland

The estimation of the ground temperature profile with respect to the depth and time is the key issue in many engineering applications which use the ground as a source of thermal energy. In the present work, the influence of the model components on the calculated ground temperature distribution has been analysed in order to develop an accurate and robust model for the prediction of the ground temperature profile. The presented mathematical model takes into account all the key phenomena occurring in the soil and on its top surface. The impact of individual model elements on the temperature of the soil has been analysed. It has been found that the simplest models and the most complex model result in a similar temperature variation over the simulation period, but only at a low depth. A detailed analysis shows that a larger depth requires more complex models and the calculation with the use of simple models results in an incorrect temperature and a theoretical COP estimation.

关键词： heat transfer ground heat transport ground temperature profile ground source heat pump

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Measurement investigation on the feasibility of shallow geothermal energy for heating and cooling applied in agricultural greenhouses of Shouguang City: ground temperature profiles and geothermal potential

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Information Processing in Agriculture 2021年第2期8卷 251-269页

作者： Anh Tuan Le Liang Wang Yang Wang Daoliang Li National Innovation Center for Digital Fishery China Agricultural UniversityBeijing 100083China Beijing Engineering and Technology Research Centre for Internet of Things in Agriculture Beijing 100083China Key Laboratory of Agricultural Information Acquisition Technology Ministry of AgricultureBeijing 100083China College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China Department of Electronics Nam Dinh University of Technology EducationNam Dinh 07000Viet Nam

The use of electrical energy for heating and cooling systems to control the temperature in greenhouses will lead to high production and product *** solve this problem,shallow geothermal energy as a local source of energy could be *** this study,a measurement model,the distribution profiles of temperature,and a preliminary assessment of the geothermal potential in the shallow zone at depths of 0.1 m to 3.6 m in Shouguang City,Shandong Province,eastern China were *** measurement results showed that the annual average temperature at depths of 0.1–3.6 m ranged from 13.1℃ to 17.6℃.Preliminary assessment results of the geothermal potential showed that the daily average temperature difference between the air and at depths of 1.5–3.6 m was mainly from 10℃ to 25℃ during the winter months and between-15℃ and-5℃ during the summer ***,the heating systems could operate during January,February,November,and *** May,June,and July,the cooling systems could be ***,the measurement model gave good stability results,and it could be used in combination with the monitoring of the groundwater table,a survey of the thermal conductivity of the soil,climate change studies,which helps reduce unnecessary time and costs.

关键词： ground temperature profile Geothermal energy ground heat exchanger Measurement model Shouguang

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