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The future of Geothermal and Earth Coupling devices

The future of Geothermal and Earth Coupling devices

What is the future of Geothermal and Earth Coupling devices? Are these
technologies viable and if so how do they work? Are they cost effective and are they
sustainable? ( These questions would cover electrical power generation and heating and
cooling capabilities.)

Together with the increased requirement for thermal ease and comfort, individuals who live in southern China more target the demand for central heating. In such background, central heating will have a great space for development in the future. Meanwhile, people who live in northern China have used coal as their heating source for a long time, resulting in serious air pollution. Therefore, it is very urgent to develop a new clean energy. Geothermal energy, an environmentally-friendly and recycled energy, enjoys a large reserves and wide distribution in China. The expansion harness of geothermal energy is beneficial to improve energy structure, reduce pollution, save energy and cut down emission of greenhouse gases. It is in line with the demand for building a “resource-conserving and environmentfriendly” society to strengthen the development GSHP technology and to increase the use ratio of geothermal energy.

GSHP includes a normal water-resource warmth water pump model, a geothermal temperature swap program and an in-developing method. Selecting rock-soil body, ground-water, surface-water and other materials with a small temperature fluctuation as the low-temperature heat source, GSHP, which uses heat pump principle, has the ability to convert low-grade heat energy to high-grade heat energy through high taste energy (e.g. electric energy). In summer, the heat absorbed from room by GSHP is transferred to the heat transfer medium, which can emit some of the heat underground to achieve indoor cooling. In winter, the heat source is changed from room to ground. Through heat transfer medium, the heat can be transferred into room to achieve indoor heating.

Making use of secure below the ground source of heat, GSHP can control interior temp to some comfort and ease common. Compared to the traditional temperature regulation methods, GSHP is more environmentally-friendly and efficient. Driven by electric energy, GSHP operates without combustion process, and thus no pollutant emission occurs. In addition to the above advantages, GSHP also has great system stability and low maintenance cost. However, there are still some shortcomings in the application of GSHP, including large initial investment, difficulty in household use, complicated system and high installation difficulty.

Being an significant creating energy-protecting technological innovation, GSHP has attained fast growth and it is firmly supported by federal insurance policies. However, the theoretical research of GSHP needs to be further improved. Combined with the actual project, the main problems occurring in the development of GSHP those need to be solved currently are as follows: Research on ground thermal properties. The soil thermal properties parameter is so important that it affects the economic efficiency and energy conservation of GSHP, including energy balance of soil, thermal performance, heat and moisture transfer in soil, and the influence of environment on soil thermal properties. According to experience, the estimated heat exchange amount of ground pipes in actual project is often low, resulting in waste of initial capital and increase of running costs. Therefore, it is of great importance for keeping a low cost in project to take an accurate measurement of relevant ground thermal properties parameters. Ground-water recharge problem. Because of the strong heat exchange capacity of water, it makes GSHP more efficient. However, it is a common problem that ground-water GSHP often cannot be completely recharged. In general, this problem is solved by recharging ground-water in several times. In most projects, however, it is still impossible to achieve complete recharge of ground-water, resulting in waste of resources. Although there are many theoretical studies on GSHP, the problem is lack of effective combination between theory and practice, systematic research on application techniques in multiple environments, and practical and effective methods for enhancing heat transfer. Environmental problem. At present, the imperfect ground-water recharge technology lead to ground-water waste and even surface subsidence, damages environmental resources and affects the promotion of GSHP with water as a low-grade heat source. Moreover, the impact of soil source heat pump air conditioning system drilling on soil heat, humidity and salt migration needs to be further studied, and the unfavorable factors need to be reduced. DEVELOPMENT PROSPECT As a clean and environmentally friendly renewable energy, geothermal energy enjoys a wide distribution and large reserves in China. Promoting the use of geothermal energy will not only help to ease the environmental pressure, but also facilitate the upgrading of modern energy mix, thus fuelling economic growth. The development prospect of GSHP in China is mainly reflected in the following aspects: Advocate Geothermal Heating of Hydrothermal Type Under the principle of “take heat without water”, hydrothermal geothermal heating extracts ground-water from mining well, transferring heat to the heat supply network and then to the users through the heat exchange station, replacing traditional energy sources with renewable clean energy sources. Since the reform and opening up, China has witnessed a rapid development of hydrothermal geothermal heating technology. However, there are still some problems, such as outdated equipment, complicated operation, and backward construction in some remote areas. Efforts need to be made accordingly. The main goal in the future for developed areas such as the Beijing-TianjinHebei Region where the hydrothermal geothermal heating technology has been developed is to update existing equipment, improve recharge systems, establish an automated management network, and improve the structure of heat sources of heat-supply system; while for these regions where the technology has not been developed, hydrothermal geothermal heating needs to be included in urban infrastructure construction, unified planning and concentrated