KR101801775B1 - Geothermal ground heat exchanger system and method for controlling thereof - Google Patents

Abstract

The present invention relates to an underground heat-exchanging system and a control method thereof. The purpose of the present invention is to provide an underground heat-exchanging system capable of controlling a discharge amount of underground water based on an inner load, allowing circulation water and underground water to be recovered in a temperature range by controlling a supply amount of circulation water heat-exchanged while controlling a heat-exchange temperature difference of a heat pump depending on a temperature of the supplied underground water, and continuously operating an underground heat-exchanger at a predetermined efficiency, and a control method thereof. The underground heat exchanging system comprises: a control board performing a step of controlling a discharge amount of underground water required to operate a heat pump according to a load condition, and a step of controlling a supply amount of circulation water heat-exchanged with a heat pump and a heat-exchange temperature difference (T) of the heat pump depending on a temperature of underground heat in a terrestrial heat hole by controlling the heat pump, a circulation water heat-exchanging unit, and the underground heat-exchanger.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geothermal heat exchanger system and method for controlling the same,

The present invention relates to an underground heat exchange system and a control method thereof, and more particularly, to a method for controlling an underground water heat exchange system so that the underground water discharge amount and a circulating water supply amount are variably controlled according to an indoor load and a temperature of an underground heat, Using the groundwater level information obtained from the operation control process, the natural disaster prediction information such as an earthquake is derived, and the calorific value and the COP information obtained from the actual geothermal heat using the flow rate and temperature information obtained in the temperature exchange process with the geothermal heat through the geothermal hole To a system and a control method.

In recent years, research and development of eco-friendly energy such as solar heat, geothermal energy, wind power, tidal power and wave power have been actively resolved in order to solve problems of depletion of fossil fuels such as petroleum, coal and nuclear power and environmental pollution problem.

Among these eco-friendly energies, the ground-based heat exchange system using geothermal energy utilizes a ground-based heat source that can be constantly used for cooling and heating irrespective of climatic conditions and seasonal changes. It is a system that is used as cooling / heating energy of a building through heat exchange between buildings.

The underground heat exchange system is an open type (including a quasi-open type SCW (standing column well) system) that exchanges groundwater directly with the bottom pump in accordance with the type of underground heat exchanger that obtains the heat source. And a sealed type in which the U-shaped pipe is indirectly heat-exchanged with the HEPP pump.

In the open type method, the groundwater is pulled up from the underground water of about 500m and the heat is exchanged, so that the heat of high temperature can be secured, so that the energy for cooling and heating of 1000m2 can be obtained in one ground hole. The geothermal capacity is about 30RT. However, the open type is highly dependent on groundwater, so it needs to use aquifers flowing with abundant groundwater. It can affect underground ecosystem due to aquifer pollution and heat exchange during geothermal drilling. However, , It is advantageous that it can supply a large amount of energy, and the necessity thereof is gradually increasing.

The quasi-open type SCW (Standing Column Well) method similar to the open type uses a single geothermal well of 500m or more, which utilizes groundwater as a heat source, such as an open type using a plurality of geothermal gates, and occupies a large number of open geothermal air- do.

The closed type method uses a ground water heat source of 150-200 m underground and has a lower heat source than a heat source used in an open type, and requires a lot of ground works. The capacity per garnet is 2 ~ 3RT level, which is an average 2.8 RT heat source. This closed system is operating more than 80% of domestic geothermal heating and cooling facilities. However, the closed type has a disadvantage in that it has less capacity to be applied to a large-scale facility than an open type and requires a lot of drilling at many times of construction.

FIG. 3 is a block diagram of a conventional open-loop underground heat exchange system according to an embodiment of the present invention.

The conventional conventional open-air underground heat exchange system shown in FIG. 1 includes a load 1 consuming a large amount of cooling and heating energy; A heat pump (2) for cooling and heating the load using heat exchanged refrigerant; An open-loop geothermal heat exchanger (4) for providing groundwater to be heat-exchanged with a heat pump; And a control panel (5) for controlling the operation of the heat pump and the underground heat exchanger.

The above-mentioned unit refers to a place where the cooling / heating energy is produced, such as an indoor space, a swimming pool, a bathroom, a large refrigerated warehouse, and a bathroom hot / hot water tank. The operating rate of the pump and the geothermal heat exchanger changes.

The heat pump 2 is a device for performing a cooling process or a heating process by compressing, condensing-expanding-evaporating a refrigerant circulated in order to supply cold and hot temperatures for cooling and heating to a load. To this end, 21), a direction switching valve (four-way valve, 22) for switching the direction of the refrigerant compressed from the compressor, a heat source side heat exchanger for performing heat exchange with groundwater circulating the refrigerant and the underground heat exchanger (23), an expansion valve (24) for expanding the refrigerant, and a load side heat exchanger (25 for operation as an evaporator during cooling and as a condenser during heating) for heat exchange with the load. Generally, the installation location of the load side heat exchanger is installed inside the load, and the controller 26 for setting the cooling and heating operation is provided as a portable remote controller (remote controller) or installed in the case of the load side heat exchanger. Further, a temperature sensor 27 for detecting the temperature of the indoor load is provided at one point or any point in the case of the load side heat exchanger to detect the room temperature. Such a configuration is a generally known cooling / heating technology, It is omitted.

The open-type geothermal heat exchanger (4) comprises at least one tearing hole (41) for storing groundwater heat-exchanged with the geothermal pierced hole in the ground, and a pumping water pipe for pumping and returning groundwater stored in the tearing hole to the heat pump (42) and a water return pipe (43), an underwater pumping pump (44) installed in a tail hole to pump groundwater through the water return pipe, and a valve (45) installed in the water return pipe. On the other hand, the groundwater pumped in each of the tearing holes may be connected to the header and supplied to the heat pump 2. If the header 421 is provided, the stability of the system can be realized by supplying a predetermined amount of groundwater.

The control panel 5 is configured to control the operation of the submerged amphibious pump installed in the trench of the submerged heat exchanger, the valve, etc., in accordance with the temperature value required or set by the load .

However, in the conventional open-air geothermal heat exchange system constructed as described above, since the amount of groundwater supplied by the amphibious pump is not controlled as needed to heat-exchange with the heat pump, only the maximum amount of water is constantly pumped so that the operation is very inefficient . In other words, although the heat pump is designed to have the maximum capacity to cope with the warmest and coldest loads, there are not many cases in which a load requiring such a maximum capacity is actually generated within one year. In most cases, . However, the operation of the actual heat pump is disadvantageous in that it consumes unnecessary energy by being operated in rated operation so that the underwater motor in the ground hole of the ground heat exchanger always provides the maximum amount of water irrespective of the size of the room load.

Also, the temperature of the geothermal heat stored in the geothroof is always maintained at 16 ~ 18 ℃ regardless of the season. The heat pump that exchanges heat with the groundwater with this temperature range usually uses the temperature difference (ΔT) Lt; RTI ID = 0.0 > C. ≪ / RTI > Therefore, when the temperature of the groundwater supplied from the trench is above 18 ° C, about 70% of the groundwater, which is returned to the trench after heat exchange in the heat source heat exchanger during the cooling operation, is returned to the state where the temperature is raised to about 23 ° C. If the cooling operation is continued with the warmed-up water being returned, the temperature is maintained at 18 ° C for normal operation in the morning, and the groundwater temperature gradually increases from 24 to 25 ° C as the high- The groundwater temperature is increased up to 27 ° C at about 3 ~ 4 o'clock in the afternoon, and normal heat exchange using the groundwater supplied to the heat pump from the trench is difficult. Therefore, there is a structural problem that the operation of the heat pump can not be continued because the operation can not be stopped for a predetermined period of time.

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In addition, at the time of heating, the temperature of the groundwater that is exchanged after the heat exchange is reversed inversely to the above-described shape becomes too low, which makes it difficult to obtain a heat source for heating.

In addition, the conventional open-type geothermal heat exchange system can not control the flow rate and temperature of the groundwater exchanged with the heat pump, and simply operates the maximum amount of water pump system to control the amount of water and temperature of each geothermal hole, There is a problem in a control method that inefficient operation is performed by operating the open-loop geothermal heat exchange system by simply calculating the COP obtained by the bottom pump.

Meanwhile, in the conventional open type earth-based heat exchange system, groundwater stored in a plurality of geothermal holes can be utilized as prediction information of a natural disaster such as an earthquake accompanied by water level fluctuation through monitoring of groundwater level by using only amniotic water using an underwater amphibious pump There is operational problem that it does not take advantage.

Korean Registered Patent Publication No. 10-1333938 (Nov. 21, 2013) Korean Patent Registration No. 10-1297103 (2013.08.09.) Korean Patent Registration No. 10-1389410 (Apr. 21, 2014) Korean Registered Patent Publication No. 10-1131990 (March 23, 2012)

In order to solve the above problems, an object of the present invention is to adjust the amount of groundwater supplied through controlling the amount of ground water to a constant value according to an indoor load and to adjust the heat exchange temperature difference of the heat pump according to the temperature of the supplied groundwater Exchanged water is regulated so that circulating water and ground water are returned to a predetermined temperature range, thereby enabling the underground heat exchanger to operate at a constant efficiency.

Another object of the present invention is to provide a method and apparatus for calculating the amount of heat and COP information that can be obtained from an actual geothermal system through flow rate and temperature information of a pumped or reclaimed process through a geothermal process in the course of continuously controlling the operation of the underground heat exchange system And an operation control method thereof.

Another object of the present invention is to provide a water level meter and a flow meter in a geothermal hole to prevent a sudden increase in the ground water temperature or overflow of the geothermal hole during the operation of continuously controlling the underground heat exchange system with constant efficiency in returning the heat- The present invention provides an underground heat exchange system capable of predicting a natural disaster such as an earthquake using the water level change information obtained in the process of monitoring the ground water level and a method of controlling the operation thereof.

According to an aspect of the present invention, there is provided a heat pump apparatus including a heat source side heat exchanger in which a coolant and a circulating water heat exchange with each other, and a load side heat exchanger that performs heat exchange with a load, Wow;

A circulating water pumping pump for pumping the circulating water stored in the circulating water storage tank to the heat source side heat exchanger, and a circulating water pump for circulating the pumped water to the heat pump side heat exchanger, A water temperature sensor for measuring the temperature of the circulating water stored in the circulating water storage tank, a flow meter for measuring the circulating water amount of water, and a water level sensor for measuring the circulating water level in the circulating water storage tank Wow;

A water pump for pumping the ground water; a water temperature controller for measuring the ground water temperature in the groundwater; a flow meter for measuring the pumped water; An underground heat exchanger including a water level sensor for measuring the ground water level, and a valve installed in the water return pipe and regulating the water volume of the heat exchanged groundwater;

The heat pump, the circulating water heat exchanging unit and the underground heat exchanger are controlled to regulate the amount of ground water required for operating the heat pump according to the load condition, and the heat exchange temperature difference (DELTA T) And a control panel for controlling the supply amount of the circulating water to be heat-exchanged with the pump.

In a preferred embodiment, when the groundwater temperature obtained through the temperature sensor provided for each geothermal hole is low when the circulating water supply amount is adjusted, the control panel sets the heat pump to have a high heat exchange temperature difference (DELTA T) And when the ground water temperature is high, the heat pump is controlled to have a low heat exchange temperature difference (DELTA T) so that a large amount of circulating water is supplied. Optionally, the heat pump temperature difference (DELTA T) Including the temperature of the circulating water obtained from the temperature sensor installed in the tank.

In a preferred embodiment, when controlling the amount of water, the control panel takes into account the water head gap and temperature stored in each trench, when the pumped groundwater is returned to the trenching hole after heat exchange with the circulating water heat exchanger of the circulation water heat exchanger It is possible to control to regulate the re-injection flow rate by adjusting the valves installed in the water pipes connected to the respective geothermal stations.

In a preferred embodiment, the control panel compares the cooling / heating temperature of the load set by the user with the actual temperature information of the load detected by the temperature sensor when the circulating water supply amount is adjusted to calculate the capacity required for operating the compressor in the heap pump, The control panel commands the water volume control means to control the amount of water in the underwater water pump installed in each trench to control the groundwater to be pumped to the circulation water heat exchanger through the water pipe,

The control system controls the monitoring of earthquake occurrence by analyzing the water level measurement information of the ground water installed in each trench,

It is possible to control the amount of heat and the COP that can be obtained from the geothermal water through quantitative data on the flow rate and temperature obtained during operation through the underwater motor and the flow meter and the temperature sensor in which the pumped water amount is controlled by the pumped water amount control means.

In a preferred embodiment of the present invention, the mobile terminal may further include a mobile terminal that is connected to the control panel to be remotely connected to allow a user to conveniently monitor or control the control process during the operation of the underground heat exchange system.

On the other hand, in another embodiment,

A load; A heat pump for cooling and heating the load using the heat exchanged refrigerant; A circulating water heat exchanger including a circulating water heat exchanger, a circulating water pump, and a circulating water storage tank to provide circulating water to be heat-exchanged with the refrigerant of the heat pump; An underground heat exchanger including a groundwater hole and a water pump for storing groundwater to provide groundwater to be heat-exchanged with the circulation water heat exchanger; And a control panel for controlling the heat pump, the circulating water heat exchanging unit, and the underground heat exchanger,

a) controlling the amount of groundwater required for operation of the heat pump according to the load condition at the control panel;

b) controlling the supply of the heat exchange temperature difference (DELTA T) of the bottom pump and the circulating water to be heat-exchanged with the bottom pump according to the temperature of the underground heat in the tearing hole in the control panel. .

According to a preferred embodiment, in the step a), the amount of the groundwater is adjusted by controlling the amount of water in the amphibious pump according to the command of the control panel,

In the step b), the supply amount of the circulating water may be adjusted by controlling the amount of water in the circulating water storage tank, and controlling the amount of water in the circulating water pump according to a command from the control panel.

In a preferred embodiment, in the step b), when the groundwater temperature obtained through the temperature sensor provided at each control hole is low, the heat pump sets the heat pump to have a high heat exchange temperature difference DELTA T so that a small amount of circulating water And when the ground water temperature is high, the heat pump is set to have a low heat exchange temperature difference (DELTA T) so that circulating water of a large flow rate is supplied,

Alternatively, the control panel may control the heat exchange temperature difference DELTA T of the heat pump, including the temperature of the circulating water obtained from the temperature sensor installed in the circulating water storage tank.

In a preferred embodiment, in the step a), when the pumped ground water is returned to the tuyereshole after heat exchange with the circulating water heat exchanger of the circulating water heat exchanger, the control panel calculates the difference between the groundwater temperature difference And adjusting the re-injection flow rate by adjusting a valve installed in the water return pipe connected to the ball.

In a preferred embodiment, the control panel compares the cooling / heating temperature of the load set by the user with the actual temperature information of the load detected by the temperature sensor to calculate the capacity required for operating the compressor in the hydro pump, Calculating an underground water quantity to be pumped;

Then, the control panel issues a command to the pumped water regulating means to regulate the pumped water quantity of the underwater pumped water pump installed in each pothole, and to pump the necessary ground water to the circulating water heat exchanger through the pumped water pipe.

In a preferred embodiment, the step (a) may further include monitoring the occurrence of seismic waves by analyzing the level measurement information of the groundwater installed in each of the trenches.

In a preferred embodiment, the step a) is a step of calculating the amount of heat and the COP that can be obtained from the geothermal through the quantitative data on the flow rate and the temperature obtained during the operation through the underwater motor, the flow meter and the temperature sensor, ; ≪ / RTI >

According to the present invention having the above-described characteristics, the pumping water amount of groundwater can be controlled according to the indoor load, so that the pumping pump installed in the pumping hole can be operated so as to pump only the necessary amount without operating at the maximum pumping amount. ,

Also, by regulating the heat exchange temperature difference of the heat pump according to the temperature of the groundwater stored in the geothermal space, the flow rate of the circulating water supplied is controlled so that the circulating water after the heat exchange is maintained at a constant temperature, And the ground heat exchanger can operate the underground heat exchange system with constant efficiency without being stressed,

In addition, by regulating the valve in consideration of the water head difference and the temperature of each geothermal hole when returning the groundwater exchanged with the circulating water, the amount of water flowing into each geothermal hole is controlled by controlling the injection time of the groundwater, And it is possible to operate the continuous underground heat exchange system by preventing excessive phenomenon such as excessive rise of the ground heat or overflow of the groundwater to the ground,

In addition, in the process of continuously controlling the operation of the underground heat exchange system at a constant efficiency, in order to prevent the rapid increase of the ground water temperature or the flooding of the ground water during the exchange of the heat exchanged reduced water, the water level fluctuation obtained by the water level meter and the flow meter The information can be used to predict natural disasters such as earthquakes,

In addition, it is possible to calculate the amount of heat and COP information that can be obtained from the actual geothermal through the flow and temperature information of the pumping or returning process through the geothermal process in the process of continuously controlling the operation of the underground heat exchange system at a constant efficiency. It is an invention that is highly expected to be used in industry as an invention.

1 is a configuration diagram of an underground heat exchange system according to an embodiment of the present invention,
2 is a flowchart showing a control step according to an embodiment of the present invention,
FIG. 3 is a configuration diagram of an open type earth-based heat exchange system according to a conventional example.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a configuration diagram of an underground heat exchange system according to an embodiment of the present invention.

As shown in the figure, an underground heat exchange system according to an embodiment of the present invention mainly includes a load 1; A heat pump (2) for cooling and heating the load using heat exchanged refrigerant; A circulating water heat exchanger (3) for providing circulating water to be heat-exchanged with the refrigerant of the heat pump; An underground heat exchanger (4) for providing a groundwater in a geothermal hole to be heat-exchanged with the circulation water heat exchanger; And a control panel 5 for controlling the heat pump, the circulating water heat exchanger, and the underground heat exchanger.

The load (1) refers to a place where the heating / cooling heat source is used, for example, a room where a cooling / heating energy is produced, such as an indoor space, a swimming pool, a bathroom, a large refrigerator, Detects the set temperature at the load, and controls the pumping amount of the amphibious pump installed in the tearing hole through the pumping amount adjusting means.

The heat pump (2) compresses, circulates, expands and evaporates the circulated refrigerant so as to supply cold and hot temperatures to the load, thereby performing a cooling process or a heating process. 21), a direction switching valve (four-way valve, 22) for switching the direction of the refrigerant compressed from the compressor, a circulating water (constant) circulating the refrigerant and the circulating water heat exchanging unit, a heat source side heat exchanger 23), an expansion valve (24) for expanding the refrigerant, and a load-side heat exchanger (25) operated by the evaporator during the cooling operation and operated by the condenser during the heating operation do.

The installation location of the load side heat exchanger (25) is installed inside the load. A controller (26) for cooling and heating operation setting is provided as a portable remote controller (Remote controller) or installed in a case of the load side heat exchanger. Further, a temperature sensor 27 for detecting the temperature of the room load is provided at one point or any point in the case of the load side heat exchanger to detect the room temperature.

The controller (or the remote controller) and the temperature sensor are usually provided in the heat pump to control the operating rate of the bottom pump. However, in the present invention, in order to continuously operate the underground heat exchange system, The amount of the groundwater supplied from the groundwater tanks is controlled variably to prevent unnecessary pumping of the water pump.

The circulating water heat exchanger 3 exchanges heat between the ground water supplied from the underground heat exchanger 4 and the circulating water (constant), and supplies the heat-exchanged circulating water to the heat source side heat exchanger 23 of the heat pump 2 It is a device that exchanges heat of refrigerant. The reason for configuring the heat exchanger in such a multi-stage manner is to prevent the corrosion of the groundwater containing various minerals, which may occur during heat exchange with the heat source side heat exchanger 23 of the heat pump 2 directly. In addition, the multi-stage heat exchanger can control the groundwater flow through the submerged water pump installed in the geothermal hole of the underground heat exchanger and control the supply flow rate of the circulating water to continuously control the groundwater and the circulation water according to the load condition. This is because the underground heat exchange system can be operated at a constant efficiency.

The circulating water heat exchanging part 3 is provided with a circulating water heat exchanger 31 for performing heat exchange with the ground water pumped from the ground water hole, a circulating water supply pipe 32 for supplying heat exchanged circulating water, A circulation water pumping pump 34 installed in the circulation water storage tank for pumping the circulation water stored therein to the heat source side heat exchanger through the circulation water supply pipe 32, a circulation water storage tank 33 for storing the heat- ), A control signal of the control panel which acquires the temperature of the groundwater or groundwater and the circulating water through the temperature sensor installed in the geothermal hole of the underground heat exchanger or the temperature sensor installed in the geothermal hole of the geothermal heat exchanger and the circulating water storage tank (35) for controlling the amount of water in the amphibious pump to regulate the flow rate of the circulating water according to the flow rate of the water, and the circulating water heat exchanged in the heat source side heat exchanger is returned to the circulating water heat exchanger It can consist of water exchange pipe (36).

The amount of water regulating means is a means for variably controlling the amount of water supplied from the amphibious pump. As means for achieving this object, a regulating valve means, a bypass valve means, an inverter means and the like may be provided.

In one embodiment of the regulating valve means, a valve for regulating the cross-sectional area of the inner diameter is provided at a groundwater inflow portion of the amphibious pump or at one point in the outflow portion to regulate the amount of water by a command from the control panel. By controlling the opening amount, it is possible to control the amount of water to be supplied in a variable manner.

In one embodiment of the bypass valve means, two or more pipes having different flow paths, each of which is provided with an open / close valve, are provided at one of the groundwater inflow portion or the outflow portion of the amphibious pump, The valve can be configured as a valve. With this configuration, one pipe is connected to the pumping water pipe and the remaining one pipe is connected to the tail pipe, so that the flow path is connected to only one pipe, and the ground water is pumped or the opening amount of the opening / It is possible to supply the variable amount of water.

One embodiment of the inverter means comprises an inverter for controlling the motor rotation amount of the amphibious pump so that the amount of pumped flow can be adjusted as needed.

It goes without saying that the above-described water-volume control means may be replaced by other means as long as the technical idea of controlling the water-volume of the illustrated embodiment can be achieved.

The circulating water storage tank 33 is provided with a flow meter 37, a temperature sensor 38 and a water level sensor 39.

The control unit 5 controls the flow rate of the circulating water to a low temperature (for example, 16 [deg.] C ), The heat exchange temperature difference ΔT used in the heat pump is set to be 5 ° C., and the amount of water regulating means reduces the amount of water in the amphibious pump to reduce the flow rate of the circulating water pumped from the circulating water storage tank. On the other hand, When the temperature of the heat is detected at a high temperature (for example, 18 DEG C), the heat exchange temperature difference DELTA T used in the heat pump is set to 3 DEG C so that the amount of water to be pumped from the circulating water storage tank is increased, The flow rate of the water is increased.

If the heat exchange temperature difference (ΔT) used in the heat source side heat exchanger of the heat pump is adjusted according to the ground water temperature to regulate the amount of the circulating water, the circulating water after the heat exchange maintains a constant temperature, As the temperature to be returned is kept constant, the groundwater temperature in the ground is not changed suddenly. As a result, the underground heat exchanger can be continuously operated with constant efficiency without stress.

The flow meter 37 precisely measures the quantity of the circulating water sucked in accordance with the command of the control panel 5 and provides the measured quantity to the control panel so that the underground heat exchange system is continuously controlled to operate at a constant efficiency.

The temperature sensor 38 is used to constantly monitor the circulating water temperature after the heat exchange in the circulating water heat exchanger 31 to continuously operate the underground heat exchange system at a constant efficiency. The temperature of the circulating water must be equal to or comparable to the temperature of the groundwater to be pumped so that the control panel 5 has no error in adjusting the heat exchange temperature difference DELTA T during heat exchange of the heat pump 2. [

The water level sensor 39 continuously measures the quantity of the circulating water stored in the circulating water storage tank 33 so that the control panel 5 is required to control the heat exchange temperature difference ΔT for heat exchange when the heat pump 2 is controlled The flow rate can be calculated. The type of the water level sensor to be used at this time may be set in consideration of the structure of the groundwater hole among known water level sensors. What is important in the present invention is that it is enough to know the water level fluctuation information obtained through the water level sensor, and the kind of the water level sensor does not limit the present invention.

The underground heat exchanger (4) basically comprises at least one ground hole (41) in which groundwater exchanged with the circulating water heat exchanger is heat-exchanged with groundwater after heat exchange with the circulating water heat exchanger, and groundwater stored in the ground hole A water return pipe 43 and a water return pipe 43 for pumping and returning the water to the circulation water heat exchanging unit 3 and the ground water stored in the water feed hole 41 through the water return pipe 42 41, and a valve 45 provided in the water return pipe.

In order to adjust the pumped water amount of the pumping water pump 44 according to the indoor load information and to control the pumped water amount for each of the pumping holes 41, a pumping water amount adjusting means 46 is provided for each pumping water pump, And is configured to adjust the pumping amount of each pumping pump (44) to solve the problem of low efficiency heat exchange of the underground heat exchanger (4), which is pumped up to the maximum pumping amount.

The amount of water regulating means is a means for variably controlling the amount of water supplied from the amphibious pump. As means for achieving this object, a regulating valve means, a bypass valve means, an inverter means and the like may be provided.

In one embodiment of the regulating valve means, a valve for regulating the cross-sectional area of the inner diameter is provided at a groundwater inflow portion of the amphibious pump or at one point in the outflow portion to regulate the amount of water by a command from the control panel. By controlling the opening amount, it is possible to control the amount of water to be supplied in a variable manner.

In one embodiment of the bypass valve means, two or more pipes having different flow paths, each of which is provided with an open / close valve, are provided at one of the groundwater inflow portion or the outflow portion of the amphibious pump, The valve can be configured as a valve. With this configuration, one pipe is connected to the pumping water pipe and the remaining one pipe is connected to the circulating water adjusting tank so that the groundwater is pumped to one of the pipes, or the opening amount of the opening / closing valve The amount of water can be adjusted by varying the amount of water supplied.

One embodiment of the inverter means comprises an inverter for controlling the motor rotation amount of the amphibious pump so that the amount of pumped flow can be adjusted as needed.

It goes without saying that the above-described water-volume control means may be replaced by other means as long as the technical idea of controlling the water-volume of the illustrated embodiment can be achieved.

Each of the ground holes includes a flow meter 47, a temperature sensor 48, and a water level sensor 49. If necessary, the temperature sensor may be installed in the pumping and return pipes to measure the groundwater temperature during the pumping process or the water-returning process.

The flowmeter 47 precisely measures the amount of underground water that is pumped up according to a command from the control panel 5 and provides the flowmeter 47 to the control panel so that the underground heat exchange system is continuously controlled to operate at a constant efficiency.

The temperature sensor 48 is used to continuously operate the underground heat exchange system with constant efficiency by continuously monitoring the temperature of the underground water before being pumped into the tail hole and the temperature of the underground heat in the tail hole according to the groundwater reacquired after heat exchange.

Also, when the control panel processes the flow rate and temperature information of the ambulatory process transmitted from the flow meter and the temperature sensor, the calorie and COP information that can be obtained in the actual geothermal field can be calculated.

The water level sensor 49 measures the amount of the ground water stored in the groundwater trench and continuously measures the ground water level in the groundwater tanks during the operation of the pumping water during the operation and provides the groundwater level to the control panel so that the groundwater supplied to the circulation water heat exchanger The amount of water to be pumped and the amount of water to be returned are controlled. Therefore, it is possible to control the amount of water discharged from each of the tear holes according to the water level, and the amount of water to be returned to each tear hole can be adjusted for each tear hole by adjusting the opening and closing amount of the valve installed at one point of the water return pipe .

On the other hand, the amount of water to be circulated is adjusted in accordance with the amount of opening and closing of the valve (solenoid valve 45, etc.) by the control panel 5, (41).

For this, the control panel 5 does not care in a system constituted by a single tapped hole when the valve 45 is adjusted, but in the case of a system composed of a plurality of tapped holes, the control panel 5 is obtained through the water level sensor 49 and the temperature sensor 48 The water is re-injected into each tear hole considering the water head difference and temperature stored in each of the tear holes 41. Accordingly, the amount of pumped water is controlled by controlling the pumped water amount of the pumped water pump 44 by controlling the pumped water amount adjusting means 46, and then the returned groundwater after passing through the circulating water heat exchanger 31 after the pumping water is returned to the state As shown in FIG.

If the same amount of underground water is re-injected without using such a valve control, an excessive temperature rise or drop of the groundwater in the geothermal hole may occur, and a problem such as overflowing of geothermal holes may occur.

However, the control panel according to the present invention controls the injection time of the ground water returned to the tail hole by using the valve, thereby controlling the amount of the run-in water flowing into each tail hole and causing excessive rise of the underground heat, So that the phenomenon of the present invention can be controlled by a program.

In addition, the water level sensor 49 is used as a sensor for predicting the groundwater level, which is another object of the present invention, as well as for using the underground heat exchange system continuously at a constant efficiency. This water level sensor predicts natural disasters such as earthquakes by measuring groundwater level fluctuation during groundwater level measurement and cooling / heating operation. Therefore, if sudden water level information is generated in the control panel, it can be recognized that it is a phenomenon of rolling phenomenon such as an earthquake. The type of the water level sensor to be used at this time may be set in consideration of the structure of the groundwater hole among known water level sensors. What is important in the present invention is that it is enough to know the water level fluctuation information obtained through the water level sensor, and the kind of the water level sensor does not limit the present invention.

On the other hand, the groundwater pumped into each of the tearing holes may be connected to the header and supplied to the circulating water heat exchanger. When the header 421 is provided as described above, it is possible to supply a predetermined amount of groundwater at a uniform pressure and flow rate.

The control panel 5 controls the set value of the controller 26 detected in the load and the temperature information value of the in-load temperature sensor 27 and the temperature information of the temperature sensor 38 provided in the tear hole 41 and the circulating water storage tank 33, The control of the amount of compression of the heat pump compressor 21, the switching of the directional control valve 22, the control of the amount of groundwater supplied to the circulating water heat exchanger 3, A pumping amount adjusting means 46 for controlling the pumping amount of each pumping pump 44 provided in the ground hole 41 of the geothermal heat exchanger 4 for controlling the opening and closing amount of the valve 45 provided in the groundwater return pipe 43, And a pumping amount adjusting means 35 for controlling the pumping amount of the circulating water pumping pump 34 in the circulating water storage tank 33 for controlling the flow rate of the circulating water supplied to the bottom pump 2 .

In addition, the control panel may be configured to be connected to a communication network or the Internet so that the control panel can be connected to a mobile terminal 6 including a tablet or a smart phone carried by the user for remote monitoring or control for control monitoring and direct control by the user . In order to be connected to the communication network, a unique telephone number is given to the control panel so that the control panel transmits the necessary information to the user's mobile terminal for a predetermined time, or conversely, the control panel responds to the user's mobile terminal to transmit necessary information .

In addition, in order to configure the control panel to be connected through the Internet, a control panel is provided with a known Internet connection means so that the monitoring information and control authority of the control panel are transmitted to the user's mobile terminal through the Internet and the corresponding control panel information is displayed . At this time, if the mobile terminal has the input of the user, it has the priority of the control command.

Hereinafter, a specific control method of the underground heat exchange system having the above-described configuration will be described with reference to FIG. 2 is a flowchart showing a control step according to an embodiment of the present invention.

First, the control panel is turned on by the fixed controller or remote control installed in the load side heat exchanger of the load or heat pump for cooling and heating the load of the underground heat exchange system. When the temperature required by the user is set according to the cooling / (S10) of calculating an amount of underground water to be pumped in a tear hole by calculating a capacity required for operating the compressor in the heap pump by comparing the actual temperature information detected by the temperature sensor for measuring the temperature in the load with the set temperature information I have.

If the control panel judges that the amount of underground water to be pumped up is not needed by the maximum amount of water, it instructs the means of controlling the amount of water connected to the circuit by a wire or wireless method and adjusts the amount of pumped water pump installed in each pumped hole, (S20).

In this case, the theoretical principle applied in the control of the water discharge is provided by the formula Q = mct. The heat source of the heat exchange system is ensured Q (calorie). When the temperature is increased, the amount of ground water is decreased. It is only necessary to change the amount of groundwater for heat exchange required according to the degree of the load by changing the amount of water to be pumped by using the water amount adjusting means.

The groundwater pumped from each tuyeres is supplied to the circulating water heat exchanger, and is supplied to the circulating water heat exchanger at a constant flow rate and flow rate, and is heat exchanged with the circulating water to transfer the underground heat.

Thereafter, controlling the amount of opening and closing of the valve by means of the control panel by exchanging the circulating water heat exchanger and the groundwater exchanged with the circulating water heat exchanger, and controlling the amount of underground water injected into each of the trenches is performed at step S30.

As the heat exchanged with the circulating water heat exchanger, the ground water whose temperature is raised or lowered according to the cooling / heating operation condition is re-injected into the tail hole through the water return pipe for heat exchange again. At this time, the same amount of ground water is not re- The control panel controls the amount of underground water injected into each hole through the valve controlled by the opening / closing amount.

The control panel adjusts the valve installed at one point of each return pipe considering the difference between the stored water level and the temperature of stored groundwater obtained through the water level sensor and temperature sensor installed in each hole when adjusting the underground water volume which is at least 70% In this way, the control of the amount of recharge water flowing into each geothermal hole is controlled by controlling the injection time of the rechargeable groundwater, thereby controlling the excessive rise of the geothermal field or overflowing the groundwater.

If the same amount of water is re-injected without regulating the amount of water, there is a case where the water level of one of the plurality of water holes is floated to the upper water hole, and if the water is pumped to different water amounts, Since the groundwater temperature is different from the groundwater temperature in the neighboring geothermal space, the smooth underground heat exchange system by the control panel may be difficult to operate with constant efficiency.

If the underground water volume is regulated as described above, it is possible to stop the operation of the underground heat exchange system, which may occur when the temperature of the groundwater having stored geothermal energy in the geothermal space or the groundwater stored in the geothermal cavity after heat exchange increases above a certain temperature .

For reference, in the case of the conventional underground heat exchange system, the groundwater stored in the ground hole is generally maintained at 16 to 18 ° C. throughout the year depending on the temperature of the underground heat. However, the pumped groundwater is circulated through the circulating water, , The temperature is raised up to 24 ~ 25 ° C in the cooling mode mode. When the groundwater having excessive temperature is re-injected into the hot air hole, stress is applied to the underground heat exchanger. As a result, the heat exchange efficiency of the entire underground heat exchange system is lowered, A large problem occurs.

Meanwhile, when the groundwater is supplied to the circulating water heat exchanger in a state in which the pumped water amount is controlled according to the load, the control panel performs heat exchange with the circulating water heat exchanger of the circulating water heat exchanger according to the temperature of the earth column, The heat exchange heat exchanger is used to heat the refrigerant in a heat source heat exchanger by controlling a circulation quantity to be increased or decreased within a predetermined range by controlling the heat exchange temperature difference ΔT used in the heat source side heat exchanger of the pump so that the load side heat exchanger (Step S40).

The reason why the flow rate of the circulating water is adjusted by adjusting the heat exchange temperature difference (DELTA T) is that when a general heat exchange system is operated with a fixed heat exchange temperature difference (DELTA T) and the operation time is increased, When the groundwater temperature reaches a state where normal heat exchange can not be achieved, the temperature of the heat-exchanged circulating water does not rise or fall sharply as a result of operation of the heat exchange temperature difference ΔT controlled by the control panel as in the present invention, And the groundwater exchanged after the heat exchange is maintained in a state in which the temperature of the groundwater is not rapidly raised or lowered. Thus, the COP is kept constant and the heat exchanging operation can be continued without stress. It is because.

In one embodiment, when the temperature of the underground heat is detected at a low temperature (for example, 16 DEG C) on the basis of the cooling operation standard, the control panel according to the present invention is set so that the heat exchange temperature difference DELTA T used in the heat source side heat exchanger of the heat pump is 5 DEG C So that the amount of water regulating means reduces the amount of water in the amphibious pump so as to reduce the flow rate of the circulating water pumped from the circulating water storage tank.

On the contrary, when the temperature of the earth is detected at a high temperature (e.g., 18 DEG C), the heat exchange temperature difference (DELTA T) used in the heat source side heat exchanger of the heat pump is set to 3 DEG C, The pump is controlled to increase the flow rate of the circulating water by increasing the amount of water to be pumped.

Although the heat exchange temperature difference? T is limited to 3 to 5 占 폚 in the above description, the present invention is not limited to the above-mentioned numerical values, and it is possible to adjust the heat exchange temperature difference? T for operating the heat pump according to the temperature of the earth, It is essential that the flow rate of the circulating water is controlled by controlling the pumping amount of the amniotic pump through the pumping amount adjusting means according to the heat exchange temperature difference? T.

That is, when the temperature of the circulating water entering the heat pump is 19 [deg.] C, for example, when the temperature of the circulating water flowing out of the heat pump is controlled to be constant by controlling the amount of water regulating means provided in the circulating water heat exchanging unit, When the heat exchange temperature difference (ΔT) of the pump is set to 5 ° C., the pump is usually in the range of 23 to 24 ° C. This is because when the groundwater heat exchanger is stressed and the pumped water is pumped up, The temperature of the circulating water after the heat exchange in the heat pump is lowered to about 24 DEG C by controlling the circulating water supply amount and the heat exchange temperature difference DELTA T in order to prevent it from being used as a heat source for heating and cooling. So as to exchange heat with groundwater.

In the above, ΔT in the heat pump can be sufficiently implemented through the inverse relationship of the temperature and the circulating water by the formula Q = mct.

When the groundwater flow rate is adjusted according to the indoor load and the groundwater temperature is controlled according to the heat exchange temperature difference (ΔT) in the heat pump and the circulating water flow rate control step is performed in multiple stages, the temperature of the groundwater and the circulating water after the heat exchange is kept constant It is possible to use the geothermal system continuously even after the afternoon after the start of operation in the morning since the underground heat exchange system reduces or slows down the stress of the underground heat exchanger. Thus, the COP 4.5 (geothermal system COP) It is possible to continuously operate the underground heat exchange system with constant efficiency.

Meanwhile, the control panel can be configured to be interlocked with a mobile terminal such as a mobile phone or a tablet so that the user can conveniently monitor or control the control process during the operation of the underground heat exchange system.

The control panel also performs a natural disaster prediction monitoring step such as an earthquake during operation control of the underground heat exchange system.

In order to obtain information on the return of groundwater during the operation of the geothermal heat exchanger, the natural disaster prediction is continuously detected by the water level sensor installed in each geothermal field. The water level of the groundwater detected by the control panel is varied It is predicted that a natural disaster such as an earthquake may occur when a water level which is not a water level value but abruptly descends, that is, a ground water desiccation phenomenon occurs, is detected.

If such a natural disaster symptom is detected, the control panel may automatically inform the disaster authorities of the level information.

On the other hand, the control panel also performs the COP calculation step of the quantitative geothermal process during the operation control of the underground heat exchange system.

In the conventional underground heat exchange system, such COP calculation was not possible because the amphibious pump installed in the geothermal facility was operated at the maximum pumped water quantity, so that it was merely operated to turn on / off according to the load. And the COP of the heat pump alone was calculated.

However, according to the present invention, since an underwater motor, a flow meter, and a temperature sensor, which are controlled by a water amount adjusting means installed in a geothermal hole, are provided to continuously obtain quantitative data on flow rate and temperature during operation, The amount of calories that can be obtained and the resulting electricity substitution (which is referred to as electricity production in renewable energy) and the COP can be accurately calculated.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

(1): load (2): heat pump
(3): circulating water heat exchanger (4): underground heat exchanger
(5): control panel (6): mobile terminal
(21): compressor (22): direction change valve
(23): heat source side heat exchanger (24): expansion valve
(25): load side heat exchanger (26): controller
(27): Temperature sensor (31): Circulating water heat exchanger
(32): circulating water supply pipe (33): circulating water storage tank
(34): Circulating water pumping pump (35): Amount of water regulating means
(36): circulating water return pipe (37): flow meter
(38): Temperature sensor (39): Water level sensor
(41): Geothermal (42): Pumping pipe
(43): water return pipe (44): positive displacement pump
(45): Valve (46): Amount of water regulating means
(47): Flow meter (48): Temperature sensor
(49): Level sensor (421): Header

Claims (12)

A heat pump including a heat source side heat exchanger for exchanging heat between the refrigerant and the circulating water for cooling and heating the load and a load side heat exchanger for heat exchange with the load;
A circulating water pumping pump for pumping the circulating water stored in the circulating water storage tank to the heat source side heat exchanger, and a circulating water pump for circulating the pumped water to the heat pump side heat exchanger, A water temperature sensor for measuring the temperature of the circulating water stored in the circulating water storage tank, a flow meter for measuring the circulating water amount of water, and a water level sensor for measuring the circulating water level in the circulating water storage tank Wow;
A water pump for pumping the ground water; a water temperature controller for measuring the ground water temperature in the groundwater; a flow meter for measuring the pumped water; An underground heat exchanger including a water level sensor for measuring the ground water level, and a valve installed in the water return pipe and regulating the water volume of the heat exchanged groundwater;
The heat pump, the circulating water heat exchanging unit and the underground heat exchanger are controlled to regulate the amount of ground water required for operating the heat pump according to the load condition, and the heat exchange temperature difference (DELTA T) And a control panel for controlling the supply amount of circulating water heat-exchanged with the pump.

The control panel sets the heat pump to have a high heat exchange temperature difference (DELTA T) within a set range when the ground water temperature obtained through the temperature sensor provided for each geothermal hole is low when the circulating water supply amount is adjusted, The control unit controls the heat pump to have a low heat exchange temperature difference (DELTA T) so as to supply a large amount of circulating water, and selectively controls the heat exchange temperature difference (DELTA T) The temperature of the circulation water obtained from the sensor is included,
In addition, when controlling the amount of water, the control panel, when the pumped groundwater is returned to the groundwater after heat exchange with the circulating water heat exchanger of the circulating water heat exchanging unit, the control panel considers the difference between the water headwater stored in each groundwater hole and the temperature, The control of the regeneration flow rate by regulating the valve installed in the connected water return pipe,
The control panel compares the cooling / heating temperature of the load set by the user with the actual temperature information of the load detected by the temperature sensor when the circulating water supply amount is adjusted to calculate the capacity required for operating the compressor in the heap pump, And then the control panel issues a command to the pumped water regulating means to control the pumped water amount of the underwater pumping water pump installed in each pothole so that the required groundwater is controlled to be pumped to the circulating water heat exchanging portion through the pumped water pipe. Heat exchange system.
delete delete The method according to claim 1,
The control panel,
It analyzes the water level measurement information of the ground water installed in each geothermal hole, monitors and monitors the earthquake occurrence,
And controlling the amount of heat and COP that can be obtained in the tearing hole to be calculated through the quantitative data on the flow rate and the temperature obtained during the operation through the underwater motor and the flow meter and the temperature sensor in which the pumped water amount is controlled by the pumped water amount adjusting means. system.
The method according to claim 1,
And a mobile terminal connected to the control panel in a remote connection so that the user can conveniently monitor or control the control process during the operation of the underground heat exchange system.
A load; A heat pump for cooling and heating the load using the heat exchanged refrigerant; A circulating water heat exchanger including a circulating water heat exchanger, a circulating water pump, and a circulating water storage tank to provide circulating water to be heat-exchanged with the refrigerant of the heat pump; An underground heat exchanger including a groundwater hole and a water pump for storing groundwater to provide groundwater to be heat-exchanged with the circulation water heat exchanger; And a control panel for controlling the heat pump, the circulating water heat exchanging unit, and the underground heat exchanger, the control method for the underground heat exchange system according to any one of claims 1, 4, and 5,
a) controlling the amount of groundwater required for operation of the heat pump according to the load condition at the control panel;
b) adjusting the heat exchange temperature difference (ΔT) of the bottom pump and the supply amount of circulating water heat-exchanged with the bottom pump according to the temperature of the underground heat in the tearing hole in the control panel,

In the step a), the amount of the groundwater is adjusted by controlling the amount of water in the amphibious pump in accordance with the command of the control panel by providing a water amount adjusting means for each of at least one tapped hole provided in the underground heat exchanger, The control means is provided to control the amount of water in the circulating water pump in accordance with a command from the control panel,
In the step a), when the pumped groundwater is returned to the tuyeres after the heat exchange with the circulating water heat exchanger of the circulating water heat exchanger, the control panel controls the amount of the groundwater in the tanks, And regulating the installed valve to regulate the re-injection flow rate,
In the step a), the control panel compares the cooling / heating temperature of the load set by the user with the actual temperature information detected by the temperature sensor, calculates the capacity required for operating the compressor in the hydraulic pump, and calculates the amount of groundwater to be pumped ; Then, the control panel issues a command to the pumped water regulating means to regulate the pumped water amount of the underwater pumped water pump installed in each of the potholes so that the required groundwater is pumped to the circulating water heat exchanger through the pumped water pipe.
In the step b), when the groundwater temperature obtained through the temperature sensor provided at each control hole is low, the control panel sets the heat pump to have a high heat exchange temperature difference (DELTA T) within a set range to supply circulating water with a small flow rate, The temperature of the heat pump is set to a low heat exchange temperature difference DELTA T so that a large amount of circulating water is supplied to the heat pump. Optionally, the control panel controls the heat exchange temperature difference DELTA T of the heat pump, And adjusting the temperature of the circulating water including the temperature of the circulating water obtained from the installed temperature sensor.
delete delete delete delete The method of claim 6,
Wherein the step a) further comprises monitoring the occurrence of seismic waves by analyzing the level measurement information of the groundwater installed in each of the trenches.
The method of claim 6,
In the step a), the control panel calculates the amount of heat and the COP that can be obtained from the tearing hole through the quantitative data on the flow rate and the temperature obtained during the operation through the underwater motor and the flow meter and the temperature sensor in which the pumped water amount is controlled by the pumped- Further comprising: a control unit for controlling the operation of the underground heat exchange system.

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