Geothermal apparatus

Abstract

This technical target aims to provide a novel geothermal apparatus which is made more economical and practical by rationalizing the recovery method of a geothermal energy. The geothermal apparatus is characterized in that a geothermal energy recovering pipe is made to have a double-pipe structure, in which the internal space of an inner pipe and the space between an outer pipe and the inner pipe are used as an outgoing passage or an incoming passage for a heat medium, in that the inner pipe and the outer pipe are connected to a heat utilizing device thereby to form a circulation passage, which is filled with the heat medium, in that the outgoing passage and the incoming passage of the heat medium are thermally insulated from each other, and in that the heat medium of a relatively high pressure of saturated vapor is adopted to transfer the heat as a latent heat. The circulation rate of the heat medium can be reduced to make the scale of the entire apparatus compact, so that the initial cost and the running cost can be reduced. By filling the heat medium of the high pressure of saturated vapor, moreover, the geothermal energy can be efficiently recovered even in case the geothermal energy recovering pipe is deeply buried.

Description

technical field [0001] The invention relates to a geothermal energy utilization device, in particular to a device that significantly improves practicability by reducing initial cost, operating cost and maintenance cost. Background technique [0002] Since geothermal energy has a substantially constant temperature throughout the year, the temperature difference between it and the ground can be used as a heat source for air conditioning and snow melting. [0003] For this reason, the following methods have been adopted in the past: drawing groundwater, or sending brine (brine) as a heat carrier to pipelines arranged underground to absorb geothermal energy, and recovering heat on the ground by circulating brine or the like (for example, refer to Patent Document 1). [0004] In the case of such a conventional method, since sensible heat is used, the amount of drawing of groundwater and the circulation amount of a heating medium are large, and the scale of piping and a pump beco...

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Problems solved by technology

[0004] In the case of such a conventional method, since sensible heat is used, the extraction amount of groundwater and the circulation amount of the heating medium are large, resulting in large-scale piping and pumps.

Moreover, there are the following problems: the thermal efficiency is also poor, resulting in an increase in the original cost, operating cost, and maintenance cost, which is not cost-effective

In addition, in the case of drawing groundwater, there is also the disadvantage of causing the ground to sink

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