61results about "Geothermal prediction/simulation" patented technology

The invention provides systems and methods for cooling and / or heating a structure. Generally, a system for heating or cooling a structure can include at least one thermosiphon in thermal communication with a thermal storage material such as a volume of earth. The thermosiphon can be partially filled with a heat transfer fluid and a heat exchanger operatively connected to the thermosiphon which is in thermal communication with the structure. Thermal energy can be transferred between the thermal storage material and the structure in either a passive or assisted mode, depending on whether the system is charging or in use.

A geothermal loop in-ground heat exchanger for energy extraction including an outer tubular casing and an inner tubular portion spaced from the outer tubular casing to define an injection space wherein a working fluid is injected into the injection space at a first temperature, T1 while the heat exchanger is located in a geothermal heat reservoir and the working fluid exits through the inner tubular portion at a second temperature, T2 which is greater than T1.

The invention discloses a simulation experiment device used for an enhanced geothermal system and a method for evaluating porous sandstone geothermal reconstruction by means of the simulation experiment device. The simulation experiment device comprises a heat exchanger chamber, a prefabricated rock, an electric heating panel, a constant-temperature liquid supply groove, two liquid colleting grooves and horizontal geostress simulation units, wherein an inlet and two outlets corresponding to the inlet are formed in the heat exchange chamber, and the inlet and the outlets all communicate with a cavity; and the prefabricated rock is arranged in the cavity, a first injection shaft, a first production shaft and a second production shaft are further arranged in the prefabricated rock, the injection shaft is located between the first production shaft and the second production shaft, the injection shaft communicates with the inlet, the first production shaft and the second production shaft communicate with the two outlets correspondingly, and preset seams, micro pressure sensors and micro temperature sensors are arranged in the prefabricated rock.

A computer which functions by a performance prediction program for a ground source heat pump system of the present invention and a performance prediction system constructed thereby include a dimensionless distance calculating means, a first dimensionless time calculating means, a second dimensionless time calculating means, a boundary time acquiring means, an underground temperature change calculating means, and a tube surface temperature change calculating means. The performance prediction program and performance prediction system can be applied to the design of heat exchange system by obtaining predicted underground temperature data for the ground source heat pump system with high accuracy and predicting the performance for the ground source heat pump system based on the resulting underground temperature changes, etc., considering the use of a plurality of buried tubes, underground temperature change patterns for buried tubes placed at different intervals, and the use of U-shaped tube heat exchangers.

Systems include a well having a production casing and a production tubing positioned therein, forming an annulus there between. A packer is positioned in the annulus at a position sufficient to separate the annulus into a first portion and a second portion. The well further includes a tie-back conduit positioned in the first portion of the annulus and configured to allow heat transfer between a working fluid flowing through the first portion of the annulus and a production fluid flowing through the production tubing, thus separating the circulating working fluid from fluids in the second portion of the annulus. A working fluid loop is fluidly connected to the first portion of the annulus. Co-production methods, methods of modeling, and computer-readable media including the methods of modeling are disclosed.

The invention relates to a large-diameter steel sleeve heat exchange device capable of extracting the geothermal energy, and belongs to the technical field of heating ventilation air conditioners capable of saving energy and reducing emission. The device mainly includes a ground source heat exchange well composed of a steel sleeve with the bottom being sealed, a PE inner tube, a filtering device, an impurity precipitation groove, a heat insulating plate and a water circulating flow diversion device. According to the connection relation, the steel sleeve is inserted into the ground, the ground source heat pump heat source side returned water is communicated with an upper end opening of the steel sleeve, and the PE inner tube is arranged in the steel sleeve; the filtering device is fixed inside the bottommost end of the PE inner tube; the impurity precipitation groove is formed in the bottommost end of the steel sleeve well; the heat insulating plate wraps the PE inner tube; the water circulating flow diversion device is arranged at a water inlet of the well and connected to the PE inner tube. By means of the large-diameter steel sleeve heat exchange device capable of extracting the geothermal energy, the problem that a soil source heat pump system is large in occupied space is solved, and the heat exchange amount of a single-opening ground source well is greatly increased.

The invention discloses a process method and equipment for constructing a ground source heat pump well. The process method comprises the following steps of: drilling a testing well by adopting a casing following pipe drilling underground construction process, testing thermophysical properties of local rock by adopting a rock physical property tester, digging out gang of wells in a number calculated according to the tested thermophysical properties by adopting a casting following pipe drilling process, feeding U-shaped pipes into the gang of wells by adopting a quick pipe feeding process, connecting a plurality of wells in parallel into a group by adopting a reversed return system, connecting each group into a ground source water loop system according to direct return, introducing a return water supply main pipe into a main engine room, performing multiple pressing sequentially until the quality requirement is met, and finishing the construction. The process method is particularly suitable for difficult construction geological conditions with hard rock such as granite and the like; safe, high-efficient, quick and convenient construction is ensured by applying various advanced special construction processes and equipment; the consumption of manpower and materials, and labor intensity are reduced; the construction and preparation time is saved; the comprehensive construction cost is reduced; and the actual project application effect is good.

An in-ground geothermal heat pump (GHP) closed loop design program is disclosed for designing, analyzing, and simulating a detailed model and analysis of a proposed buildings in-ground geothermal heat pump system, including borehole length, number of boreholes, heat pump capacity, grid layout, total electric operating costs, efficiency ratios, and hybrid designs, among others. In one aspect of the disclosure described herein, the GHP design program can reliably and efficiently predict the fluctuations of the GHP equipment performance in very small increments which enables the determination of energy consumption and demand information on a specific and unique hourly schedule basis for a proposed building design, including incorporating thermal load data for each individual zone of the building. More specifically, the small increment method here can be used to eliminate overly broad approximations by evaluating GHP performance that is specific to building dynamics, constants, and variables for all of the building individual zones and the building's hourly operating schedule, thereby providing an efficient, reliable, simple, and effective geothermal heat pump design and simulation model.

Disclosed herein is a method for analyzing 2-dimensional geothermal resource data using a web-based 3-dimensional sectional view, to implement an analyzing module performing 3-dimensional section analysis for 2-dimensional geothermal resource spatial data as a program run by data processing devices including a computer. The method for analyzing 2-dimensional geothermal resource data using a web-based 3-dimensional sectional view is configured by the processes of: selecting an analysis target region and generating linear vector data; requesting a section analysis layer of GeoServer for the target region; generating a dynamic query for a section analysis according to the delivered conditions, and executing PostGIS, an open source GIS software; delivering a result of the sectional view analysis executed by PostGIS to OpenLayers, and generating a section analysis results chart to display it on the Web; and displaying the sectional view analysis chart as a pop-up window.

The present invention relates to energy supply systems which comprise an energy storage unit and an energy production unit. Control methods according to the invention advantageously allow to calculate an operational cost of the energy supply system based on the energy flux that can be supplied by the system and the energy flux that is demanded externally from the system. The operational cost can be calculated for all possible values of the above parameters in advance. The calculated parameters can be stored in an array in a device implementing methods of the invention. Methods of the invention allow to operate an energy supply system so as to guarantee that at any instant a predetermined (nonzero) amount of energy flux can be supplied by the energy storage unit.

The invention provides systems and methods for cooling and / or heating a structure. Generally, a system for heating or cooling a structure can include at least one thermosiphon in thermal communication with a thermal storage material such as a volume of earth. The thermosiphon can be partially filled with a heat transfer fluid and a heat exchanger operatively connected to the thermosiphon which is in thermal communication with the structure. Thermal energy can be transferred between the thermal storage material and the structure in either a passive or assisted mode, depending on whether the system is charging or in use.

A method and system for optimizing the operation of a geo-exchange system, by generating predictive models pertaining to energy demand and energy capacity for a particular building or district, based on data from sensors associated with components of a district geo-exchange system, historical and real-time operational data associated with district modules, including weather forecast data and current weather conditions.

The invention discloses a bypass type gas-liquid separation type geothermal energy productivity testing system. The bypass type gas-liquid separation type geothermal energy productivity testing systemcomprises a production well, a wellhead valve, a gas-liquid separator, a condenser, a cooling tower, a cooling pump, a pressure pump and a recharge well, wherein an inlet of the wellhead valve communicates with a heat source outlet of the production well, and the tail end is provided with a tee joint; one outlet of the tee joint communicates with an inlet of the gas-liquid separator, and anotheroutlet of the tee joint communicates with the recharge well; a liquid outlet of the gas-liquid separator communicates with an inlet of the pressure pump; a gas outlet of the gas-liquid separator communicates with an inlet of the condenser; a gas outlet of the condenser communicates with the atmosphere; a condensed water outlet of the condenser communicates with an inlet of the cooling tower; an outlet of the cooling tower communicates with an inlet of the cooling pump; an outlet of the cooling pump communicates with a condensate water inlet of the condenser; a liquid outlet of the condenser communicates with an inlet of the pressure pump; and an outlet of the pressure pump communicates with the recharge well. The bypass type gas-liquid separation type geothermal energy productivity testingsystem is provided with the wellhead valve, the outlet flow rate is adjusted, and the flow and the composition of the geothermal fluid at the wellhead and the geothermal energy productivity value areobtained.

A geothermal loop in-ground heat exchanger for energy extraction including an outer tubular casing and an inner tubular portion spaced from the outer tubular casing to define an injection space wherein a working fluid is injected into the injection space at a first temperature, T1 while the heat exchanger is located in a geothermal heat reservoir and the working fluid exits through the inner tubular portion at a second temperature, T2 which is greater than T1.

The invention discloses a testing device and a testing method for testing the normal contact stress of a pile-soil interface under the variable temperature condition. The testing device comprises a frame, a vertical pressure loading system, a pile-soil interface simulation system, a water circulation temperature control system and a data acquisition system, wherein the pile-soil interface simulation system comprises a base and a ring-shaped concrete box, a soil sample and the ring-shaped concrete box are put into a space in the middle of the base, and the pile-soil interface simulation system is used for simulating the pile-soil interface; the water circulation temperature control system is used for simulating the temperature change process of a pile body. According to the testing device and the testing method, the temperature of the ring-shaped concrete box is controlled by means of water circulation, so that the processes of temperature rise and temperature drop in a heat exchange process of an energy pile can be simulated. Test data is provided for the change mechanism study of the normal contact stress of the pile-soil interface under the action of hot and cold cycling by means of data collection and analysis. The testing device and the testing method are used for mastering the change of mechanical properties of the energy pile and promoting the popularization and application of an energy pile technology, and have important theoretical research and engineering guide values.

The invention discloses a temperature response calculation method of a pile foundation spiral buried pipe under a condition of underground water seepage. The temperature response calculation method of a single pile foundation spiral buried pipe under a condition of three-dimensional underground water seepage according to a temperature response, generated by a point heat source, in an infinite uniform medium of underground water at a three-dimensional speed during flowing of the medium. When the underground water flows through a pile buried pipe group at the three-dimensional speed, the temperature response generated by any point in the underground medium at any time is superposition of effects of the underground water seepage and heat exchange of the pile buried pipe group, so that a calculation mode of the temperature response can be obtained. Furthermore, a backward reasoning and calculating method is used for setting ranges of the size and the direction of the flowing speed of the underground water in a process of obtaining the seepage speed of the underground water; values are continuously extracted from the ranges, and points are arranged around a drilled hole; a variance sum of calculated values and experimental values of all the points within a certain time phase is calculated; when the variance sum of most of the points is minimum, the size and the direction of the actual flow speed of the underground water are obtained.

A method for controlling temperature maxima and minima from the heel to toe in geothermal well lateral sections. The method includes disposing at least a pair of wells proximately where thermal contact is possible. Working fluid is circulated in one well of the pair in one direction and the working fluid of the second well is circulated in as direction opposite. to the first. In this manner temperature equilibration is attainable to mitigate maxima and minima to result in a substantially more uniform temperature of the working fluids in respective wells and the rock formation area there between. Specific operating protocol is disclosed having regard to the temperature control for maximizing thermal energy recovery.

The invention discloses a meshless calculation method for the performance of a medium-deep buried double-pipe heat exchanger. The meshless calculation method comprises an initial parameter setting part and a loop iteration calculation part. The loop iteration calculation part comprises the steps that parameters of a middle-deep buried heat exchanger structure are determined according to an actualheat exchange well structure, and meanwhile initial value calculation conditions are set according to the initial parameter setting part; the whole pipeline is divided into a plurality of control unitbodies along the length direction of the pipeline according to the actual length of the pipeline section, the position coordinates of the control unit bodies are determined, the total time length andthe time step length of the operation period are determined, and finally the setting of iteration conditions is completed; 4, the loop iteration calculation convergence judgment and result output arecarried out. The method is helpful for people to obtain integral understanding of physical parameters of all parts in the system operation process before engineering development, and theoretical guidance is provided for actual engineering. Application of the method can be completed before actual engineering development, and the method has the advantage of being easy to implement.

The invention discloses a fluid temperature field analysis method for a double-pipe buried pipe heat exchanger, and belongs to the technical field of ground source heat pumps. The method comprises thesteps: establishing transient heat transfer equations of an inner pipe fluid and an outer pipe fluid, analyzing radial one-dimensional heat transfer in backfill soil and soil by adopting a compositemedium column heat source model, and respectively establishing a heat transfer model of the double-pipe buried pipe heat exchanger in two flowing directions (inner-in and outer-out: the fluid flows infrom the inner pipe and flows out from the outer pipe; wherein a fluid flows in from the outer pipe and flows out from the inner pipe); based on the established heat transfer model, setting a time step length, equally dividing an inner pipe fluid and an outer pipe fluid into a plurality of nodes along the axial direction respectively, dispersing a heat transfer equation, establishing an algebraicequation of each node, and calculating the temperatures of all nodes at each moment by adopting an iterative method, thereby completing the calculation of fluid temperature fields changing along withdepth and time in two flowing directions. The method has the characteristics of small calculation amount, high precision, wide applicability and the like.

The present invention discloses a heat transfer calculation method for a pile buried pipe in a groundwater seepage environment and a verification system thereof. The method comprises: according to a Green function in a groundwater seepage environment, analyzing a temperature response that is generated in an infinite uniform medium when groundwater flows in the medium at a three-dimensional speed; and by using a virtual heat source method, obtaining a heat transfer calculation method for a single pile buried pipe heat exchanger under a groundwater three-dimensional seepage condition. A groundwater flow rate and direction meter is used to obtain the flow rate of local groundwater, which provides an important parameter for using the heat transfer calculation method. Moreover, the verification system using the heat transfer calculation method carries out verification on rationality of the method, simulates the heat transfer process of the pile buried pipe in the groundwater seepage environment under an operating condition of a heat pump unit, and obtains actual data by means of a test. The tested data is compared with the calculation result of the heat transfer method, so that the method is verified, and promotion and application of the method are certified.

A method or apparatus that uses a fluid in a closed loop well system to extract heat from geothermal resources that are located in or near high-temperature, low-permeable geologic formations to produce power. In some embodiments, the closed loop system may include one or more heat exchange zones, where at least a portion of the one or more heat exchange zones may be disposed within a subterranean region having a temperature of at least 350° C. The subterranean region may be within a plastic zone or within 1000 meters of the plastic zone, the plastic zone having a temperature gradient of at least 80° C. per kilometer depth.

The invention provides a method for evaluating the water drive heat collection capacity of a hydrothermal geothermal field, and the method comprises the steps: calculating the storage capacity of geothermal water in the geothermal field, the storage capacity of geothermal energy in a rock skeleton and the storage capacity of geothermal energy in the geothermal water through a heat storage method,and obtaining the total reserve of the whole heat storage geothermal energy; then evaluating the water gushing capacity and the recharging capacity of the geothermal well through a water pumping testand a recharging test, and designing a mining and recharging mode on the basis of the test data; and finally, establishing a geothermal field numerical model on the basis, and calculating the total heat recovery quantity and recovery rate of the geothermal well under the condition of extraction and irrigation, so as to evaluate the heat recovery capability of the hydrothermal geothermal field in the water flooding heat recovery mode, and provide reference for efficient development of geothermal resources.

A system and method for performing at least one thermal response test for a medium. At least one request signal indicative of at least one request to perform the thermal response test is received. On the basis of the at least one request, at least one control signal is generated for causing at least one parameter of a fluid circulating through the medium to be acquired. The at least one measurement is indicative of a thermal property of the medium. The at least one control signal is then output to a hydraulic system.

The invention relates to a method for predicting the temperature of the circulating liquid of a medium-deep U-shaped heat exchange well. The medium-deep layer U-shaped heat exchange well comprises a descending pipe, a horizontal pipe and an ascending pipe. A plurality of nodes are arranged in the medium-deep layer U-shaped heat exchange well and rock soil on the periphery of the medium-deep layerU-shaped heat exchange well. And temperature information of the nodes at the circulating liquid inlet and the peripheral rock and soil nodes at the circulating liquid inlet at the initial moment is collected, the collected temperature information is substituted into a prediction model formed by node equations of the multiple nodes in the medium-deep layer U-shaped heat exchange well, and temperature information of other position nodes and other moments of the medium-deep layer U-shaped heat exchange well is obtained. The method is low in equipment investment, and the change rule of the temperature of the circulating liquid along with the position and time can be mastered.

A system and method for performing at least one thermal response test for a medium. At least one request signal indicative of at least one request to perform the thermal response test is received. On the basis of the at least one request, at least one control signal is generated for causing at least one parameter of a fluid circulating through the medium to be acquired. The at least one measurement is indicative of a thermal property of the medium. The at least one control signal is then output to a hydraulic system.

An air conditioning system using deep seawater, includes: a pump device pumping the deep seawater; a seawater-coolant heat exchanger performing heat exchange between a cold energy in the deep seawater and a coolant; an air conditioning heat exchanger performing heat exchange with the coolant cooled by the cold energy to release the cold energy in a target facility for cooling; a coolant circulating system circulating the coolant between the seawater-coolant heat exchanger and the air conditioning heat exchanger; and a controller driving the pump at timing when a variation is anticipated in the predicted heat loads based on the predicted heat load of the facility predicted from a prediction value of an operation status of the facility and a prediction value of a weather status at the place of the facilitate and a time lag due to a length of the pipe in the coolant circulating system.

A geothermal energy system comprising at least one borehole heat exchanger, Hie at least one borehole heat exchanger containing a working fluid and comprising an elongate tube having a closed bottom end and first and second adjacent elongate coaxial conduits interconnected at the bottom end, the first conduit being tubular and surrounded by the second conduit which is annular, the at least one borehole heat exchanger having a major portion thereof extending in a substantially inclined orientation at an angle of from 3 to 95 degrees from vertical.