A method for making coaxial geothermal probes that comprise a hollow outer pipe (2) and an inner pipe (5), wherein inserting the outer pipe (2) in the ground comprises: driving into the ground using pressure, applying an axial thrust to it that is generated by means of a hydraulic actuator (30), a head element (13) that is tubular and closed at the bottom by a driving head (18) and equipped with a first thread (19) at the top; screwing a second thread (24) of an additional tubular element (14) to the first thread (19) of the head element (13), creating a fluidtight connection between the head element (13) and the additional element (14); further driving into the ground (11) using pressure the assembly constituted of the head element (13) and of the additional element (14), applying an axial thrust to them that is generated by means of a hydraulic actuator (30); and optionally performing once or more the steps of screwing the second thread (24) of a further additional element (14) to a free first thread (19) of an additional element (14) already driven into the ground (11) and connected to the head element (13), and further driving the whole assembly into the ground (11) using pressure.

The present disclosure provides a heat supply device using an underground dry heat source. The heat supply device comprises a cold water supply device, a hot water suction pump and a heat supply pipeline, wherein the cold water supply device is arranged on the ground and used for injecting cold water into the heat supply pipeline; the hot water suction pump is connected with the heat supply pipeline; and the heat supply pipeline comprises a vertical well conduction section and a horizontal well heating section. The present disclosure further provides a heat supply method using the heat supply device using an underground dry heat source. The heat supply method comprises the followings steps: S1, exploring the underground dry heat source; S2, measuring the heat conductivity coefficient of hot dry rock; S3, drilling a well; S4, determining the number of branch wells; and S5, arranging a heat supply device.

A helical pile including a heat exchanger is described. The pile is formed from a lead section and one or more extension sections. The interior of the lead and extension sections are hollow and form a heat exchanger cavity. At the lower end of the lead section is a helical blade. Rotation of the lead section causes the helical blade to screw into the ground, thus pulling the lead section downward. Extension sections are added to the lead section and the pile is rotated until it is installed to a desired depth. The pile includes an inflow tube extending a predetermined distance into the heat exchanger cavity and an outflow port connected with the heat exchanger cavity. In operation, a heat carrying fluid is pumped into the inflow tube from a heat source or sink, for example, a heat pump for a building heating and cooling system. The fluid exits the tube at a point near the bottom of the heat exchanger cavity. The fluid flows upward through the heat exchange cavity and exchanges heat with the surrounding soil. The fluid flows out through the outflow port and back to the heat source or sink.

In order to install a ground loop for a geothermal heating and/or cooling system in ground material, a drilling machine having a drill bit connected to an end of first tubing may be used to create an borehole in the ground material. After the borehole is created, grout may be pumped into the borehole through the first tubing as the first tubing is removed from the borehole. This allows the borehole to be grouted from the bottom towards the top. Thereafter, second tubing may be inserted into the grout in order to create the ground loop. This eliminates the need for a tremie pipe to insert the ground loop and pump grout into the borehole, while still allowing for the borehole to be grouted from the bottom towards the top to reduce the likelihood of voids.

Thermal Moisture Enhanced Gradient Strata (TMEGS) for Heat Exchangers optimizes the performance of energy flows for building heating, cooling, hot water, and industrial processes. TMEGS are temperature and moisture control layers which reduce the cost of closed loop ground heat exchangers and increase heat exchanger performance by improving energy transfer between solar, geothermal, process heat and renewable energy exchangers. Circuit optimized thermally active building structures (COTABS) configure heat exchangers and thermal energy strata for application specific requirements. TMEGS integrated with COTABS is a scalable and interoperable carbon-free, planet friendly architecture for net zero energy buildings. Embodiments include the use of recycled materials, waste tire derived aggregate, nanofluids, phase change materials, cathodic protection, and integrated microprocessor and client-server controls.

Provided here is an architectural plan (the solution) for the restoration of the terminal lake, the Salton Sea, an area of prevalent geothermal sources. It includes division of the Lake into three sections, preventing pollution of the Lake from nearby farmlands and importing seawater in central section with pipeline system; providing condition for tourism, and wildlife sanctuary; generating electricity by harnessing hydro, solar, and geothermal energy; and producing potable water and lithium as byproducts. Also includes a system and method for harnessing geothermal energy for generation of electricity by using complete closed loop heat exchange systems combined with onboard drilling apparatus. The system includes several devices operating separately in many different applications in energy sectors, Also, included is alternative use for the In-Line-Pump for marine crafts propulsion.

A geothermal system including a multitube vertically-sealed underground heat-exchanger includes: a geothermal well formed by vertically excavating a foundation; a heat pump which is arranged in the foundation, and which includes a circulating pump; and a connection tube, an auxiliary facility, and a multitube vertically-sealed underground heat-exchanger which are buried and installed in the geothermal well, and which are connected to the heat pump such that a thermal fluid thermally restored in the geothermal well is supplied to the heat pump through the circulating pump, and the thermal fluid that has undergone heat exchange in the heat pump is recovered back to the geothermal well and thermally restored therein.

Methods and compositions for enhancing the flow rate and heat transfer efficiency of wellbores and/or propped fractures for use in geothermal operations are provided. In some embodiments, the methods comprise: injecting an etching agent into an injection inlet of a first wellbore penetrating a first portion of a subterranean formation, wherein the injection inlet is disposed at a first location at or near a surface of the subterranean formation; injecting a working fluid having a first temperature into the injection inlet; allowing at least a portion of the working fluid to flow from the injection inlet to a production outlet of a second wellbore penetrating a second portion of the subterranean formation; and producing the portion of the working fluid out of the production outlet at a first rate and at a second temperature that is higher than the first temperature.

Renewable geothermal energy harvesting methods may include distributing the working fluid from a ground surface into thermal contact with at least one subterranean geothermal formation; transferring thermal energy from the subterranean geothermal formation to the working fluid; distributing the working fluid from the subterranean geothermal formation back to the ground surface; and distributing the working fluid directly to at least one thermal application system. The thermal application system may be configured to utilize the thermal energy to perform work. The thermal energy may be utilized at the thermal application system to perform the work. Renewable geothermal energy harvesting systems are also disclosed.

A helical pile including a heat exchanger is described. The pile is formed from a lead section and one or more extension sections. The interior of the lead and extension sections are hollow and form a heat exchanger cavity. At the lower end of the lead section is a helical blade. Rotation of the lead section causes the helical blade to screw into the ground, thus pulling the lead section downward. Extension sections are added to the lead section and the pile is rotated until it is installed to a desired depth. The pile includes an inflow tube extending a predetermined distance into the heat exchanger cavity and an outflow port connected with the heat exchanger cavity. In operation, a heat carrying fluid is pumped into the inflow tube from a heat source or sink, for example, a heat pump for a building heating and cooling system. The fluid exits the tube at a point near the bottom of the heat exchanger cavity. The fluid flows upward through the heat exchange cavity and exchanges heat with the surrounding soil. The fluid flows out through the outflow port and back to the heat source or sink.