In the cold season, people can enjoy a warm and comfortable life without burning coal, gas or electricity, which will become a reality. The research and demonstration project of shallow geothermal drilling technology jointly undertaken by the School of Architecture and Engineering of Jilin University and Beijing Geological Engineering Company formally passed the assessment and acceptance organized by China Geological Survey. Researchers use geothermal technology to extract efficient energy from underground rock, soil and groundwater to replace traditional heating (cooling) methods. Relevant experts believe that the achievement has made a major breakthrough in the theoretical research and practical application of shallow geothermal development and utilization, which has practical significance and broad application prospects for the promotion and utilization of renewable clean geothermal resources. According to experts, the human existence of the earth is a huge energy cornucopia, 47% of the solar radiation energy is the surface soil, water absorption. The surface of a certain depth of water, soil, rock and other seasons are basically constant temperature, even in the winter temperature of minus twenty or thirty degrees Celsius, about 5 meters below the surface of the water, soil, rock temperature is also 8 Celsius, which appeared temperature difference. With the progress of science, the use of similar air-conditioning principle, through the heat pump technology, energy can be fully utilized. The use of shallow geothermal energy for building heating (cooling) ratio in developed countries in Europe and the United States has reached 30% or even higher. In-depth study of the technical problems of the closed-source ground-source heat pump system and the closed ground-source heat pump system is carried out by a group led by Prof. Sun Youhong, professor of Architectural Engineering Department of Jilin University. The key points are as follows: The reasonable layout of pumping well for water source heat pump, the influencing factors and solutions of irrigation volume are researched. The change of temperature field within 100m deep underground in the test area is studied, which provides basis for design and calculation of ground source heat pump system. The new efficient coaxial tube-and-tube underground heat exchanger analyzes the heat transfer process and establishes the data physical model. The underground heat exchanger parameters of the ground-source heat pump system and the backfill in the well are optimized and designed. Ground source heat pump system operating parameters of real-time monitoring of the 206m2 demonstration project for the development and application of shallow geothermal energy provides a full-featured technology research platform. In turn, this "free" green renewable energy "moved" on the ground. It requires only a small amount of electrical energy and can heat the building without any pollution (cooling), saving up to 50% on conventional indoor air conditioners and double the efficiency. At present, the technology has been promoted to an area of ​​46000m2 in Beijing and achieved satisfactory results.
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