KR101835010B1 - System for cooling indoor-floor electrical panel using geothermal - Google Patents

Abstract

In a system for cooling an incoming and distribution panel installed indoors using geotherm, provided is the system for cooling an indoor incoming and distribution panel, which includes an underground duct which forms a flow path so that external air introduced to one end thereof is inputted to the inside of the incoming and distribution panel in the other end thereof and exchanges ground heat with internal air by burying at least a part thereof under the ground, a blowing fan which is located in the other end of the underground duct and discharges the internal air of the underground duct to the inside of the incoming and distribution panel, and a control unit which controls the operation of the blowing fan so as to maintain a stat in which the internal air pressure of the incoming and distribution panel is higher than the external air pressure of the incoming and distribution panel. Accordingly, the present invention can cool the incoming and distribution panel and blocks the inflow of external gases into the incoming and distribution panel.

Description

TECHNICAL FIELD [0001] The present invention relates to a cooling system for indoor and outdoor systems using a geothermal heat exchanger,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cooling system for a switchboard cooling system, and more particularly, to a cooling system for cooling heat generated from parts installed in a cabin installed in a house using geothermal heat.

Generally, collective power consumers such as schools, buildings, apartment complexes and factories were equipped with switchgear to obtain the power they needed. Such a switchboard is equipped with a transformer, switchgear and other safety devices to transform the extra high voltage supplied from the substation into a suitable low-voltage commercial voltage.

The transformer has a structure in which an iron core is wound around a primary coil connected to a power source and a secondary coil connected to a load in order to change the applied voltage to a higher or lower voltage so as to keep the power constant. That is, the transformer includes a transformer unit composed of a primary coil, a secondary coil, and an iron core, and the transformer unit is filled in the case and filled with the insulating oil. The reason for using insulating oil is to prevent this phenomenon because moisture or dust enters the coil insulation and lower the dielectric strength, and heat generated from the iron core or coil is dissipated by convection or radiation of oil.

On the other hand, in a large-capacity transformer, a heat radiator for circulating insulating oil to the outside of the tank is installed to improve the heat radiation effect. However, in the conventional transformer having the above-mentioned radiator, a plurality of heat radiators are installed on the side of the transformer in order to increase the heat radiation efficiency, and a plurality of blowing fans and a ventilation hole and a ventilation hole are further installed in the power distribution panel. That is, as shown in FIG. 1, a plurality of blowing fans, a blowing hole, and a ventilation hole are provided in the body of the switchgear, so that the heat generated by the transformer as well as the current transformer and the like is discharged from the inside to the outside of the power distribution board.

However, when the above-described air blowing fan, air outlet, and air vents are formed in the switchboard, a large amount of foreign substances such as dust and worms are introduced into the interior of the switchboard through the air blowing fan, There is a problem that a fire frequently occurs.

In order to solve such a problem, Korean Patent Registration No. 1658427 and Korean Laid-Open Patent No. 2016-0005584 disclose techniques for cooling a switchboard using geothermal heat.

However, when the switchboards of the preceding patents are installed indoors in the sewage treatment plant, combustible gas such as methane generated in the sewage treatment plant can flow into the switchboard, and the combustible gas introduced into the switchboard may be exposed to the risk of explosion have.

Therefore, there is a need for a new method for solving the above problems.

(Patent Document 1) KR1658427 B1

(Patent Document 2) KR2016-0005584 A1

An object of the present invention is to provide a cooling system for a indoor-indoor power supply and distribution panel using geothermal heat that can block the flow of external gas into the interior of a switchboard as well as the cooling of a switchboard.

In order to solve the above problems, the present invention provides a system for cooling a switchboard installed in a house using geothermal heat, wherein a flow path is formed so that outside air introduced into one end can be introduced into the inside of the switchboard at the other end, An air duct installed at the other end of the underground duct for discharging the internal air of the underground duct to the inside of the switchgear and an internal air pressure of the switchgear, And a control unit for controlling the operation of the blowing fan so as to maintain a state higher than the external atmospheric pressure of the switchboard.

According to one embodiment, the switchboard cooling system includes a first pressure gauge for measuring an internal air pressure of the switchboard and a second pressure gauge for measuring an external air pressure of the switchboard, The first pressure value of the second pressure gauge is higher than the second pressure value of the second pressure gauge.

According to an embodiment of the present invention, the underground duct has a condensed water outlet for discharging condensate formed by condensation of the outside air introduced into the one end portion into the ground, and the underground duct is sloped around the condensate outlet So that the condensed water can be led to the condensed water discharge port along the slope.

According to one embodiment, the underground duct includes at least one of an outside air introduction section into which the outside air is introduced, a condensation water drain hole in which the condensation water outlet is formed, and a cold air discharge section through which the air inside the underground duct is discharged into the inside of the & And an air cooling section located between the cool air discharge section and the condensation water discharge section to cool the inside air, wherein the air cooling section may be buried at a depth between the freezing depth and the ground water.

The air conditioner module may further include an air conditioning module located at the other end of the underground duct to supply the inside air of the underground duct to the inside of the switchgear according to an embodiment of the present invention, An air filter unit disposed at a front end of the blowing fan to filter out foreign substances in the air, a chamber unit positioned at the front end of the blowing fan to damp vibration generated by the air flow, And a dehumidifying portion for removing the dehydrating agent.

According to one embodiment, the air conditioning module may further include a check valve portion positioned at a front end of the blowing fan so as to have an air flow only in the direction of the blowing fan.

According to an embodiment of the present invention, the switchboard includes a cold air inlet formed on the bottom surface for communicating with the other end of the underground duct, and an air outlet formed on the upper surface for communicating with the exhaust duct for discharging the inner air of the switchboard .

The indoor cooling system for geothermal heat exchanger according to the present invention is a system for cooling indoor and outdoor water supply and distribution panels by providing cool air so that the indoor air pressure of a cabin installed in a house is maintained higher than a indoor air pressure, .

In addition, it is possible to thoroughly dehumidify the cool air flowing into the interior of the switchgear, thereby preventing failure or shortening of the service life of the switchgear due to moisture.

FIG. 1 is a diagram showing the overall outline of a conventional switchboard.
2 is a block diagram of a power plant cooling system according to an embodiment of the present invention.
FIG. 3 is a view showing an entire underground duct of a power plant cooling system according to an embodiment of the present invention.
FIG. 4 is a schematic view illustrating the operation of the air blowing fan according to the internal and external pressures of the switchboard according to the embodiment of the present invention.
5 is a flowchart illustrating a process of determining whether the blower fan is operated based on a temperature value and a temperature difference according to an embodiment of the present invention.
6 is a configuration diagram of an air conditioning module according to an embodiment of the present invention.
FIG. 7 is a schematic view of a part of a switchboard cooling system according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, the terms "comprises" or "having ", and the like, are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

FIG. 2 is a schematic view of a part of a substation cooling system according to an embodiment of the present invention, and FIG. 3 is a view showing an entire substructure duct of a power plant cooling system according to an embodiment of the present invention.

As shown in FIGS. 2 and 3, in a cooling system for cooling a switchboard 20 installed in a house, a switchboard cooling system according to an embodiment of the present invention is constructed such that, as shown in FIGS. 2 and 3, A ventilation fan 51 disposed at one end of the underground duct 30 for providing the outside air cooled by the ventilation fan 20 to the inside of the switchboard 20, And a control unit (not shown) for controlling the driving of the blowing fan 51 based on the atmospheric pressure.

However, it is needless to say that the components shown in Figs. 2 and 3 are not essential, and a switchboard cooling system having components having more or fewer components can be implemented. Hereinafter, each component will be described.

The switchboard 20 according to the present invention may be installed in a building (such as an electric room or a machine room) 10 in a house, particularly a sewage disposal plant or the vicinity thereof.

Since the conventional power transmission and distribution panel 20 is made of an unsealed steel box and the steel box is provided with a plurality of punches so that various types of pipes can be drawn into the interior of the switchboard 20, a combustible gas such as methane May be introduced into the interior of the switchboard. The outdoor unit containing the combustible gas may be introduced into the interior of the switchboard 20 even if the switchboard 20 is constructed so that the interior of the housekeeping service switchboard 20 forms a closed room. Such a combustible gas always has a risk of explosion in a power supply and a high-voltage power supply. Therefore, it is urgently required to propose a solution to solve such a problem.

The cooling system of the power plant according to the present invention supplies outside air cooled by geothermal heat to the inside of a power plant, cooling the heat generated from parts attached to the inside of the power plant (20), and at the same time, 20, so that the risk of explosion of the combustible gas can be reduced by interrupting the internal inflow of the combustible gas.

At least a part of the underground duct (30) is buried in the ground so that the underground duct (30) allows heat exchange with the internal air.

The underground duct (30) has an outer air inlet (31) into which an outer air (preferably air at a position separated from a sewage treatment plant by air not containing a combustible gas) is introduced at one end and an outer air inlet And a condensed water discharge port 32 positioned between the outer air inlet 31 and the cold air discharge port 33. The condensed water discharge port 33 is provided with a cooling air discharge port 33, have. In this case, the outer air inlet 31 may be provided with a suction fan 60 for forcibly introducing high-temperature outside air into the duct, and the cold air outlet 33 may be provided with A blowing fan 51 may be installed. The blowing fan 51 or the suction fan 60 may be installed inside or outside the duct.

The outdoor air entering the outdoor air inlet 31 is cooled by cooling the outdoor air through the indoor heat exchanger 30 while staying in the underground duct 30 at a high temperature outside the outdoor air inlet 31, The cooled outside air is supplied to the inside of the switchboard (20) through the cold air outlet (33). The condensed water formed by condensation of the high temperature outside air in the process of cooling the high temperature outside air is discharged to the ground through the condensed water discharge port 32.

As shown in FIG. 3, the underground duct 30 provides an air flow path between the outer air inlet 31 and the cool air outlet 33, and the underground duct 30 can be divided into four sections. That is, the underground duct 30 includes an outside air introduction section S1 into which outside air is introduced, a condensate water discharge section S2 in which the condensed water outlet is formed, A cold air discharge section S4 and an air cooling section S3 located between the condensed water discharge section S2 and the cold air discharge section S4 for cooling air in the duct.

The underground duct 30 is divided into the outside air introduction duct P1, the branch duct P2, the air cooling duct P3 and the cold air discharge duct P4 corresponding to the sections S1 to S4. .

At this time, the underground duct 30 may have at least one branch point, and the branch duct P2 branched at the branch point may be guided so that the condensed water can be discharged into the ground.

It is preferable that the outside air introduction duct P1 and the air cooling duct P3 are embedded in the ground so as to be inclined downward toward the condensation water discharge port 32. [ That is, it is preferable that the condensed water is discharged to the ground through the condensed water outlet 32 quickly by the gravity along the inclination so that the air in the duct can maintain the low humidity. At this time, according to one embodiment, aggregate such as crushed stone or gravel is contained in the distal end of the branch duct P2 to buffer the infiltration of the condensed water into the ground, and a cavity is formed around the distal end of the branched duct P2. Is not formed.

The air-cooling duct P3 is for cooling the high-temperature outside air introduced into the duct through underground heat exchange, and can be buried at a depth equal to or less than the freezing depth to cool the air in the duct. At this time, the length of the air-cooling duct P3 is not particularly limited, but it is preferably about 50 m so that the air in the duct is stored at a depth equal to or less than the freezing depth so that the underground heat exchange can be sufficiently performed.

However, it is preferable that the air cooling duct P3 is buried at a depth equal to or less than the freezing depth, but buried at a depth higher than the groundwater. The groundwater can be introduced into the duct through the branch duct P2 communicated with the air cooling duct P3 and the underground duct 30 can be directly corroded or destroyed by the groundwater.

The control unit (not shown) is located at the other end of the underground duct 30 and controls the operation of the air blowing fan 51 for discharging the air in the duct into the interior of the switchboard 20. Specifically, So as to maintain a state where the internal pressure of the ventilation fan (51) is higher than the external air pressure of the switchboard (20).

In order to determine whether the difference between the outside air pressure and the inside air pressure of the switchboard 20 is a positive pressure (+) or a negative pressure (-), the control unit controls the cooling system according to an embodiment of the present invention, And a pressure gauge (or pressure sensor) 22 (hereinafter collectively referred to as a pressure gauge) for measuring the internal air pressure.

The pressure gauge 22 is a means for measuring the outside / inside air pressure of the switchboard 20 and may include a first pressure gauge 221 and a second pressure gauge 222 on the inside and the outside of the switchboard 20, A single pressure gauge may directly measure the pressure difference between the inside and the outside of the switchboard 20.

The control unit controls the blowing fan 51 so as not to operate when the internal pressure of the switchboard 20 is higher than the external air pressure in accordance with the pressure value measured by the pressure gauge 22, When the air pressure is lower than or equal to the external air pressure, the blowing fan 51 can be controlled to operate.

For example, FIG. 4 is a schematic diagram illustrating the operation of a blower fan according to the internal and external pressures of a switchboard according to an embodiment of the present invention.

4 (a), when the internal pressure of the switchboard 20 is 930 mb and the external pressure is 1,000 mb, the controller determines the difference between the external pressure and the internal pressure of the switchboard 20 as a positive pressure And the blower fan 51 is operated to supply the cool air in the underground ducts 30 into the interior of the switchboard 20.

On the other hand, as shown in FIG. 4 (b), when the internal pressure of the switchboard 20 is 1,010mb and the external pressure is 1,000mb, the control unit calculates the difference between the external pressure and the internal pressure of the switchboard 20, The operation of the blowing fan 51 is stopped so that the cool air in the underground duct 30 can not be supplied into the interior of the switchboard 20.

The internal air of the underground duct 30 having a temperature lower than the temperature of the air in the interior of the switchboard 20 is supplied into the interior of the switchboard 20 so that the interior of the switchboard 20 The temperature inside the switchboard 20 can be lowered and the internal pressure of the switchboard 20 can be raised to prevent internal inflow of the combustible gas outside the switchboard 20 .

Here, since the other end of the underground duct 30, specifically the end on the cold air discharge port 33 side, communicates with the switchboard 20, the switchboard 20 can be provided with a cold air inlet 21, (21) is formed on the bottom surface of the switchboard (20).

In order to prevent an external force due to a rise in the internal pressure of the switchboard 20 from acting on the components of the switchboard 20, the switchboard 20 is provided with an exhaust duct 40 for communicating with the exhaust duct 40 for discharging the internal air to the outside. It is preferable that the outlet 23 is formed on the upper surface of the switchboard 20.

Since the relatively heavy low temperature air is sequentially stacked and discharged from the inner bottom portion to the inner upper portion of the switchboard 20, it is possible to prevent the efficiency deterioration caused by the cold air being exhausted without being stored in the switchboard 20 to be.

2, reference numeral 11 denotes an access floor for supporting the switchboard 20 so as to connect the underground duct 30 to the cold air inlet 21 formed on the bottom of the switchboard 20.

According to one embodiment of the present invention, the control unit controls the blowing fan 51 according to a temperature value measured by a thermometer (or a temperature sensor) (not shown) installed inside the switchboard 20, .

The control unit can operate the blowing fan 51 when the temperature value measured by the thermometer is equal to or higher than a predetermined reference temperature value. On the other hand, when the temperature value measured by the thermometer is less than the predetermined reference temperature value, the operation of the blowing fan 51 can be stopped, but the control unit can control the pressure difference between the outside air pressure of the & When the difference is determined as a static pressure, the blowing fan 51 can be operated to supply the cool air in the underground duct 30 into the interior of the switchboard 20. This is shown in the flowchart in FIG.

As a result, the control unit can determine whether the air blowing fan 51 is operating based on the temperature value measured by the thermometer and the difference between the external air pressure and the internal air pressure of the switchboard measured by the pressure gauge.

Specifically, the control unit can operate the blowing fan 51 when the internal temperature value of the switchboard 20 is less than the reference temperature value and the external air pressure difference is the positive pressure (in the case of FIG. 4A) The operation of the air blowing fan 51 can be stopped and the internal temperature value of the switchboard 20 can be switched to the reference temperature (for example, the case where the internal temperature value is lower than the reference temperature value and the external air pressure difference is negative) The blowing fan 51 can be operated regardless of whether the difference in the outside air pressure is the positive pressure or the negative pressure.

According to another embodiment of the present invention, the inner air of the underground duct 30 is positioned at the other end of the underground duct 30, specifically, at the end of the cold air outlet 33, 20 to the inside of the room. That is, the air conditioning module 50 for adjusting the air cooled by the underground heat can be installed at the installation position of the blowing fan 51 shown in FIG.

6 is a configuration diagram of an air conditioning module according to an embodiment of the present invention. 6, the air conditioning module 50 includes at least one of the air blowing fan 51, the check valve portion 52, the dehumidifying portion 53, the chamber portion 54, and the air filter portion 55, . ≪ / RTI >

The blowing fan 51 is operated according to the control signal of the control unit and can supply the inside of the underground duct 30 to the inside of the switchboard 20 according to whether the blowing fan 51 is operated or not, as described above.

The air filter unit 55 is located at the front end of the air blowing fan 51 and serves to filter out foreign substances in the air. The air filter unit 55 includes at least one layer made of, for example, paper or cloth .

The air passes through at least one layer of the air filter portion 55, so that foreign matter in the air is filtered.

The chamber portion 54 is provided between the air filter portion 55 and the blowing fan 51 and serves as a means for attenuating vibrations generated by the airflow formed by the blowing fan 51. The chamber portion 54 has a predetermined size As shown in FIG.

Some of the parts attached to the interior of the switchboard 20 are vulnerable to external vibrations, resulting in an abnormal operation of the parts, weakening of the coupling between the parts, May not operate properly or the durability may be lowered.

Periodic or non-periodic vibration is generated by the driving of the blowing fan 51, but the chamber 54 can attenuate the vibration generated from the blowing fan 51. The vibration transmitted to the switchboard 20 is attenuated so that the influence of the drive of the blower fan 51 on the switchboard 20 can be minimized.

The dehumidifying part 53 is located at the front end of the blowing fan 51 and is a means for removing moisture in the air. The dehumidifying part 53 includes a silica gel, an alumina gel, a molecular sieve, molecular sieves, and the like.

It is desirable to reduce the humidity of the cold air supplied to the inside of the switchboard 20 to prevent failure or shortening of the life span of the switchboard due to the moisture because the parts attached to the inside of the switchboard 20 are vulnerable to moisture and there is a fear of electric leakage.

The air conditioning module 50 is located at the other end of the underground duct 30 as described above. The air duct module 30 may further include an expansion portion 56 between the underground duct 30 and the air conditioning module 50.

The expanded portion 56 having a cross sectional area wider than the sectional area of the underground duct 30 is connected so as to communicate with the distal end portion of the underground duct 30 so that the end portion of the underground duct 30 is widened in width from the underground duct 30 The flow rate of the discharged air becomes low. In other words, by lowering the flow rate of the air passing through the air filter section 55, the chamber section 54, and the dehumidifying section 53, the air conditioning efficiency can be improved.

The air conditioning module 50 is installed at a front end of the air blowing fan 51 so that the air flow is formed only in the direction of the air blowing fan 51, And may further include a valve portion 52.

The check valve unit 52 may include at least one check valve for allowing air to flow only in one direction, and the type of the check valve is not particularly limited.

It is possible to prevent the cool air from flowing back into the underground duct 30 through the inlet 21 of the cold air formed in the switchboard 20 by the check valve.

FIG. 7 is a schematic view of a part of a switchboard cooling system according to another embodiment of the present invention. As shown in FIG. 7, the switchboard cooling system according to another embodiment of the present invention may further include a dehumidifier 70.

The dehumidifying device 70 is disposed on the underground duct 30, preferably at the other end side of the underground duct 30, that is, at the front end of the switchboard 20 so as to lower the humidity of the air supplied to the switchboard 20 .

The dehumidifying device 70 is a device having higher dehumidifying ability than the dehumidifying part 53 described above. The dehumidifying device 70 uses a commercial power source to cool air in the underground duct 30 to a temperature lower than the dew point by using a refrigerant, Can be lowered.

By further using the dehumidifying device 70 in this manner to thoroughly dehumidify the cool air flowing into the interior of the switchgear, it is possible to prevent the failure or the life span of the switchgear 20 due to moisture.

The preferred embodiments of the present invention have been described in detail with reference to the drawings. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning, range, and equivalence of the claims are included in the scope of the present invention Should be interpreted.

10: Building 20: Switchboard
21: cold air inlet 22: pressure gauge
23: Outlet outlet 30: Underground duct
31: outer air inlet 32: condensation water outlet
33: cold air outlet 40: exhaust duct
50: air conditioning module 51: blowing fan
52: Check valve part 53: Dehumidifying part
54: chamber part 55: air filter part
56: expansion part 60: suction fan
70: Dehumidifying device

Claims (7)

A system for cooling a cabin installed in a building using geothermal heat, the system comprising:
An underground duct in which at least a part of the air is buried in the ground so that the inside air and the underground heat exchange are made;
A ventilation fan located at the other end of the underground duct for discharging the air inside the underground duct to the inside of the switchgear; And
When the internal pressure of the switchgear is lower than the external air pressure so that the internal pressure of the switchgear is kept higher than the external air pressure of the switchgear, A control unit for controlling operations of the display unit;
Lt; / RTI >
The underground duct has a condensed water discharge port for discharging the condensed water formed by condensation of the outside air introduced into the one end into the ground and is buried in the ground so as to incline about the condensed water discharge port, To be guided to the condensed water outlet,
The underground duct includes at least one of an outside air introduction section into which the outside air is introduced, a condensation water drain opening at which the condensation water outlet is formed, a cold air discharge section through which the internal air of the underground duct is discharged into the inside of the power storage and distribution section, And an air cooling section located between the condensation water drainage section and cooling the inside air, wherein the air cooling section is buried at a depth between the freezing depth and the groundwater,
And an aggregate for buffering penetration of the condensed water into the ground is contained in the distal end of the condensed water discharge port,
Further comprising: an air conditioning module located at the other end of the underground duct to supply air to the inside of the switchgear in harmony with the air of the underground duct, wherein the air conditioning module includes: And a check valve unit for allowing the air to flow only through the check valve unit. The method according to claim 1,
Wherein the switching and cooling system includes a first pressure gauge for measuring an internal air pressure of the switchgear and a second pressure gauge for measuring an external air pressure of the switchgear,
Wherein the control unit controls the operation of the blowing fan so that the first pressure value of the first pressure gauge is higher than the second pressure value of the second pressure gauge. delete delete The method according to claim 1,
The air conditioning module includes a blower fan, an air filter unit positioned upstream of the blower fan to filter out foreign substances in the air, a chamber unit positioned at the front end of the blower fan and damping vibration generated by the airflow, And a dehumidifying unit located at a front end of the blowing fan to remove moisture in the air. delete The method according to claim 1,
The switchgear includes an inlet for cooling air formed on the bottom surface to communicate with the other end of the underground duct and an exhaust outlet formed on the top surface for communicating with the exhaust duct for discharging the interior of the switchgear to the outside Indoor cooling system for indoor and outdoor use by geothermal.

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