KR100919162B1 - Air conditioning system cooled by water and indoor unit of the same - Google Patents

Abstract

The indoor unit of the water-cooled air conditioning system according to the present invention includes a compressor in which a refrigerant is compressed; A condenser in which the compressed refrigerant is condensed by contact with the cooling water; An evaporator which evaporates after the condensed refrigerant is expanded to absorb external heat; A water collecting portion at least disposed under the condenser and collected when the cooling water leaks; And a leak sensor for detecting the fact of leakage by the coolant collected in the collecting part.

Since the occurrence of leakage can be quickly and accurately known by the water-cooled air conditioning system and the indoor unit of the water-cooled air conditioning system, it is possible to quickly and accurately prevent the leakage of the opposite cooling water in the building.

In addition, by preventing the coolant from leaking, the amount of coolant is preserved, so that the entire water-cooled air conditioning system can be safely operated for the other layers in which the leak is not generated.

Description

Air conditioning system cooled by water and indoor unit of the same

The present invention relates to a water-cooled air conditioning system, and more particularly, a water-cooled air conditioning system and a water-cooled air conditioning system, which eliminates a risk that may be caused by a leak in an indoor unit of a water-cooled air conditioning system, so that the water-cooled air conditioning system can be used more safely. It is about the indoor unit.

In general, the water-cooled air conditioning system has higher efficiency and lower noise at the indoor unit than the air-cooled method in which the refrigerant is condensed by air.

In addition, when the above-described water-cooled air conditioning system is applied to a large building, the air pipe or the refrigerant pipe is not exposed to the outside, resulting in a beautiful building appearance, convenient maintenance, and no airtight refrigerant pipe is required. This higher advantage can be obtained.

On the other hand, in recent years, there are many large skyscrapers in large cities, and these skyscrapers cannot create open windows on each floor due to stability problems and high wind speed problems. Therefore, it is common to perform centralized heating and cooling in such a large building.

As a method of performing centralized heating and cooling for a large building under such a background, the above-described water-cooled air conditioning system has been proposed as one method.

The water-cooled air conditioning system includes an indoor unit and an outdoor unit, respectively. The outdoor unit is installed on the roof of a building to take the form of a cooling tower for cooling high temperature cooling water, and the indoor unit is installed on each floor of the building to supply cold coolant cooled in the outdoor unit to condense a refrigerant. do. The coolant warmed in the indoor unit forms one coolant cycle that is circulated to the outdoor unit and cooled.

In addition, in the indoor unit, the refrigerant cooled by the cooling water forms one refrigerant cycle that is expanded in the expander, evaporated in the evaporator, and compressed in the compressor. Of course, while evaporating in the evaporator to absorb the external heat to lower the temperature of the outside air. In a device in which heat exchange is performed between a coolant and a coolant in an indoor unit, a double pipe condenser in which a coolant and a coolant flow through an outer tube and an inner tube, respectively, is generally used.

On the other hand, the cooling water cycle circulating through the water-cooled air conditioning system passes through the double tube condenser, and as a whole flows into the interior of the indoor unit and then flows out after the cooling water is used for condensation. Therefore, when water leaks in the indoor unit placed on any one floor among all floors of a building, there is a concern that the coolant circulating in the coolant cycle may leak as a whole and water may be generated.

In particular, when water leakage occurs in one indoor unit, the indoor space in which the indoor unit is placed is a big problem because the entire cooling water flowing in the cooling water cycle is leaked. In addition, if leakage occurs in the coolant cycle and a large amount of water leaks, it can be easily estimated that the coolant cycle will not operate normally.

Under the background described above, when a leak occurs in any one indoor unit, there is a need for a method of quickly detecting the leak and finding a leak point and quickly repairing the leak.

The present invention is proposed to solve the above problems, by the fact that the leak occurs in the indoor unit is automatically detected, the indoor unit of the water-cooled air-conditioning system and water-cooled air conditioning system to prevent the generation of days in the entire space of the building The purpose is to propose.

In particular, an object of the present invention is to propose a structure of a water-cooled air conditioning system and an indoor unit of a water-cooled air conditioning system, which detects leakage of water in a double-pipe condenser of an indoor unit having a plurality of contacts and prevents water shortage of the entire cooling water cycle. .

Water-cooled air-conditioning system according to the present invention for achieving the above object is a plurality of indoor unit in which the cooling water and the refrigerant in contact with the heat exchange is performed; An outdoor unit in which the cooling water is cooled; Leakage detection unit for detecting the leakage of the cooling water in the indoor unit; An indoor control unit receiving the leak when the leak is detected by the leak detector; And a central control unit for displaying a specific indoor unit in which a detection signal of the indoor control unit is transmitted and leaked.

In addition, the indoor unit of the water-cooled air conditioning system according to the present invention for achieving the above object is a compressor in which the refrigerant is compressed; A condenser in which the compressed refrigerant is condensed by contact with the cooling water; An evaporator which evaporates after the condensed refrigerant is expanded to absorb external heat; A water collecting portion at least disposed under the condenser and collected when the cooling water leaks; And a leak sensor for detecting the fact of leakage by the coolant collected in the collecting part.

According to the present invention, the water leakage phenomenon of the water-cooled air conditioning system can be quickly sensed and coped with it, thereby preventing the overall number of days in the building and the normal operation of the water-cooled air conditioning system.

Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention may add, change, delete, or add other embodiments within the scope of the same idea. Although it may be easily proposed, this will also be included within the scope of the present invention.

1 is a perspective view of a building to which a water-cooled air conditioning system of the present invention is applied, and FIG. 2 is a diagram illustrating an internal configuration of each floor of a building.

1 and 2, the water-cooled air conditioning system of the present invention includes a building 1, a cooling tower 2 as an outdoor unit placed on the roof of a building, a water-cooled indoor unit 3 placed on each floor of the building, and the cooling tower. (2) a cooling water pipe (4) connecting the water-cooled indoor unit (3), an indoor duct (5) for allowing air cooled by the water-cooled indoor unit (3) to flow into each compartment of the room, and A diffuser 6 is provided at the end of the indoor duct 5 to diffuse widely into the indoor space.

The cooling tower 2 is not a general open cooling tower, but has a structure of a closed cooling tower in which cooling water is cooled by an individual complete air conditioning system in a state where the cooling water is not exposed to the outside. Therefore, it is possible to obtain the advantage that the contamination of the cooling water is prevented and the system efficiency of the air conditioning system is enhanced.

3 is a system configuration diagram of a water-cooled air conditioning system according to the present invention.

Referring to Figure 3 will be described in detail the operation to the operation of the water-cooled air conditioning system of the present invention. The coolant filled in the cooling tower 2 is pressurized by the pump 9 and guided to each floor of the building through the supply passage 7. The supply passage 7 is connected to the water-cooled indoor unit 3 on each floor, and a proportional control flow control valve 11 is inserted into each connection passage. The proportional control flow rate control valve 11 allows the amount of cooling water flowing into the water-cooled indoor unit 3 from the supply passage 7 to be linearly controlled.

In addition, the air cooled by the water-cooled indoor unit (3) is guided to each compartment of the room through the indoor duct (5), a plurality of dampers (10) formed on the indoor duct (5) is introduced into a specific space Allow the amount of cold to be controlled. A diffuser 6 is installed at the end of the indoor duct 5 to allow cold air to spread to the indoor space.

In addition, the cooling water heat-exchanged with the refrigerant in the water-cooled indoor unit 3 is discharged to the circulation flow path 8 and flows into the cooling tower 2 again and circulates, and is cooled by the cooling tower 2. After that, it is resupplied through the supply flow path 7.

On the other hand, the indoor control unit 12 to control the water-cooled indoor unit (3) is formed on each floor of the building, the indoor control unit 12 is connected to the central control unit 13 of the building to transmit and receive signals. Therefore, the user adjusts the indoor control unit 12 to adjust the driving state of the water-cooled indoor unit 3, and the indoor control unit 12 transmits the operating state of the water-cooled indoor unit 3 to the central control unit 13. To pass.

In addition, the central control unit 13 collects the operating state of the water-cooled indoor unit 3 operated in each floor, so that the air conditioning system for the building as a whole is controlled. For example, when the water-cooled indoor unit 3 of each floor is fully operated, the operation state of the cooling tower 2 can be controlled so that the cooling tower 2 may operate in full.

In addition, the indoor control unit 12 allows the proportional control flow control valve 11 to be controlled according to the operating state of the water-cooled indoor unit 3. For example, in the case where the cooling load of the water-cooled indoor unit 3 is large, the proportional control flow rate control valve 11 has a large opening so that more cooling water flows into the water-cooled indoor unit 3, and the cooling load is reduced. If it is small, the opening degree is small so that a small amount of cooling water flows in.

On the other hand, each floor of the building may be a ventilation device that can directly enter the outside air, and by installing a total heat exchanger at the inlet / outlet end of the ventilator, it is also possible to allow the outside air to flow directly.

Hereinafter, the configuration and operation of the water-cooled indoor unit 3 will be described in detail.

4 is a perspective view of the indoor unit, Figure 5 is an exploded perspective view of the indoor unit.

4 and 5, the indoor unit 3 according to the present invention includes a front panel 33, an upper panel 36, a side panel 35, a lower panel 34, and a rear panel 60, respectively. do. In addition, the front panel 33 is formed with an inlet 31 through which outside air flows into the outside air, and the upper panel 36 has a duct connecting portion 32 formed therein, through which the cooled air passes through a predetermined duct. To be discharged into each space.

In detail, the configuration and operation of the indoor unit 3 will be described.

On the lower panel 34 of the indoor unit 3, a plurality of compressors 41, 42, 43 and a double tube condenser 44 are placed. The compressor includes a first constant speed compressor 41 and a second constant speed compressor 43 that operate at a constant speed, and an inverter compressor 42 having a variable operating pressure of the compressor to vary the amount of refrigerant. In addition, the double tube condenser 44 is composed of an outer tube and an inner tube, and the coolant flows in the inner tube, and the coolant flows in the outer tube, thereby performing heat exchange between the coolant and the refrigerant at the contact surface of the inner tube. Since the heat exchange is performed in such a manner that the cooling water and the refrigerant are in direct contact with each other, the amount of heat of condensation is directly changed according to the amount of the refrigerant and the cooling water flowing into the double tube condenser 44. The compressors (41, 42, 43) is to operate a plurality of compressors selectively, the operating state of the compressor can be changed according to the cooling load, a detailed description thereof will be described later.

In addition, a lower portion of the double tube condenser 44 is provided with a collecting portion 71 in which water leaking from the pipe of the double tube condenser 44 is collected, so that the leaked water is collected. In addition, a water leak sensor is installed at a predetermined position of the water collecting unit 71 to detect the water being collected to detect the water leakage. And, if the leak is detected by the sensor, it is delivered to the central control unit 13 of the building to be repaired immediately. This prevents the occurrence of days in the building. In particular, since the double tube condenser 44 has a plurality of connecting portions such as a portion to which the refrigerant tube is joined, there is a high risk of leakage. Therefore, the sump 71 is to be placed at least under the double tube condenser 44.

In addition, an evaporator 45 is disposed at an approximately center portion of the indoor unit 3 to cool the air introduced through the suction port 31 and the suction passage 40. In addition, a drain pan 46 is disposed below the evaporator 45 to smoothly drain the condensed water generated while the refrigerant is evaporated in the evaporator 45. In addition, in order to guide the condensed water drained from the drain pan 46 to the outside of the indoor unit 3, the side panel 35 is provided with a drain 39 communicating with a portion of the drain pan 46. The cooling water inflow pipe 37 and the cooling water outflow pipe 38 which let cooling water inflow and outflow to the indoor unit 3 are formed below.

In addition, a motor 47 and a blower fan 48 connected to the motor 47 are formed above the evaporator 45 to force the air to flow inside the indoor unit 3. In addition, the air discharged from the blower fan 48 is blown to each indoor space via the duct connecting portion 32 of the upper panel 36.

The operation of the indoor unit 3 will be described with reference to the above configuration. First, the refrigerant is condensed by the double tube condenser 44. Cooling water flows through the inner tube of the double tube condenser 44, and a coolant flows through the outer tube condenser 44 to condense the refrigerant by heat exchange between the refrigerant and the cooling water. After the refrigerant is condensed in this way, it is expanded through an expansion valve (not shown), and then the heat in the air is absorbed by the heat of vaporization that flows into the evaporator 45 and is evaporated. After the evaporated refrigerant is further introduced into the compressors (41) (42) (43) and compressed, the refrigerant is introduced again into the double tube condenser (44).

In addition, the condensed water generated while the refrigerant is evaporated in the evaporator 45 is dropped into the drain pan 46 and discharged to the outside of the indoor unit 3 through the drain portion 39.

In addition, the flow of air inside the indoor unit 3 is generated by the blowing fan 48. In detail, when the blower fan 48 is driven, outside air flows into the evaporator 45 through the suction port 31 and the suction passage 40, and the outside air is cooled in the vicinity of the evaporator 45. The cooled outside air is supplied to each indoor space partitioned through the duct connecting portion 32 via the blowing fan 48.

On the other hand, three compressors 41, 42, 43 are placed as shown, so that a plurality of compressors 41, 42, 43 are formed in this way, it is selected from a plurality of compressors in accordance with the cooling load The compression capacity of the refrigerant is changed and performed in some combination. 6 illustrates a change diagram of the cooling load according to the operation state of the compressor.

Referring to FIG. 6, the compressor is selectively operated according to the cooling load of the indoor space. As the cooling load is gradually increased, the compression capacity of the refrigerant is gradually increased as the compression frequency of the inverter compressor 42 is initially increased. In the figure C3 shows the compression capacity of the refrigerant carried by the inverter compressor. However, it should be noted that as the compression frequency of the inverter compressor 42 is gradually increased, the compression capacity of the refrigerant is gradually increased, and thus the cooling capacity by the indoor unit 3 is also gradually increased.

When the cooling load of the indoor space increases and exceeds a predetermined level, the inverter compressor 42 cannot support the increased cooling load alone, and at this time, the first constant speed compressor 41 must be operated. In the figure, C1 shows the compression capacity of the first constant speed compressor. Further, when only the first constant speed compressor 41 and the inverter compressor 42 cannot handle the cooling load, the second constant speed compressor 43 is even operated so that more refrigerant is compressed. In the figure, C2 shows the compression capacity of the second constant speed compressor 43.

As a result, the inverter compressor 42 and the constant speed compressors 41 and 43 are selectively operated in combination, whereby the compression capacity of the refrigerant by the compressor is linearly increased, and is optimally adjusted according to the cooling load of the indoor environment. The compressor is operated in combination.

On the other hand, if the compression capacity of the compressor (41, 42, 43) is changed linearly, it can be easily guessed that the heat of vaporization of the refrigerant, the cooling capacity of the room, and the amount of heat of condensation of the double tube condenser are also increased accordingly. . Therefore, at this time, the proportional control flow rate control valve 11 is controlled linearly, so that an appropriate amount of cooling water is supplied to the double tube condenser 44. The flow rate control of the proportional control flow rate control valve 11 may be performed by the control of the indoor control unit 12.

FIG. 7 is a cross-sectional view taken along line II ′ of FIG. 5.

Referring to FIG. 7, a water collecting unit 71 is disposed above the lower panel 34, and at least a double tube condenser 44 is disposed above the water collecting unit 71. Therefore, if leakage occurs in the double tube condenser 44, the leaked coolant is collected in the collecting portion 71, so that the collected coolant is detected by the leak sensor.

In detail, a predetermined recess 75 is provided at a predetermined position of the collecting part 71, and a float switch 73 is disposed inside the recess 75. The float switch 73 is a material having a specific gravity lower than that of water and may be floated by leaked cooling water. In addition, a contact sensor 72 is provided at an upper side of the recess 75 so that the leak switch is detected by touching the contact sensor 72 when the float switch 73 is suspended by the leaked coolant. . After the leakage sensor is detected by the contact sensor 72, the fact of leakage is transmitted to the central control unit 13 through the indoor control unit 12 to be delivered to the monitor so that the repair work can be promptly performed by the repairman.

On the other hand, the recessed portion 75 is preferably formed at the lowest possible position of the catchment portion 71 in order to collect the leaked coolant, and the catchment portion 71 is inclined toward the recessed portion 75. To form. In addition, although the water collecting part 71 is described as being placed at the lower side of the double tube condenser 44, it is preferable that the water collecting part 71 is placed at the lower side of all the parts to which the cooling water flows inside the indoor unit.

The contact sensor 72 may be easily used as a direct leak sensor, the type of the leak sensor is not limited to the contact sensor 72 as shown. For example, various types of sensors may be used, such as optical sensors, electrical sensors, and chemical sensors. Hereinafter, the case where the electric sensor is used will be described as another embodiment.

8 illustrates an embodiment of a leak sensor according to another embodiment.

This embodiment is the same as described in the original embodiment for the other parts, except that there is a characteristic difference only in the way the leak is detected. Therefore, the description as described in FIG. 7 is used as it is for the parts not described.

Referring to FIG. 8, an electrode sensor 74 including a pair of electrodes is installed inside the recess 75. When the leaked water is in contact with the electrode of the electrode sensor 74, the current flows using the cooling water as a conductor, it can be detected that the leakage occurs by the conduction phenomenon of the electrode sensor (74).

On the other hand, when the electrode sensor 74 is formed without an additional depression 75 may be formed so that the electrode sensor protrudes on the side or bottom surface of the collecting portion (71).

Hereinafter, the configuration of a water-cooled air conditioning system according to the present invention will be described in detail with reference to a block diagram. 9 is a block diagram of a water-cooled air conditioning system according to the present invention.

9, a central control unit 13 for controlling the overall air conditioning state of the building, a cooling tower control unit 51 and a pump control unit 52 controlled by the central control unit 13, and the central control unit 13. Included is an indoor control unit 12 controlled by and placed in each interior space of each floor or compartment of the building.

The cooling tower control unit 51 controls the overall cooling water supply state to be adjusted by the cooling tower 2 so as to be suitable for the overall cooling load of the building, and the pump driving unit 52 circulates the cooling water flowing through the cooling water pipe 4. Let this be controlled.

In addition, the indoor control unit 12 operates in conjunction with a display unit 53 in which the control state of the indoor environment is displayed to the user, and an operation unit 54 for operating the control state of the indoor environment by the user. In addition, the indoor control unit 12 is associated with a plurality of driving units to control the indoor environment. Specifically, the control state of the overall indoor unit 3 including the valve drive unit 55 and the compressors 41, 42, 43 for operating the control state of the proportional control flow control valve 11 is operated. The indoor unit driving unit 56 to be controlled, the damper control unit 57 to control the supply state of the cold air introduced into each space partitioned in the room, the ventilation control unit 58 to control the indoor inflow of outside air, and the indoor unit The leak detection unit 59 in which the fact of the leak is detected is included.

Particularly, as a feature of the present invention, a leak detection unit 59 is formed to detect a leak occurring in an indoor unit. The leak detection unit 59 is a leak sensor, and includes a contact sensor 72 or an electrode sensor ( 74) may be included, and other amplifiers and wires may be included.

The operation of the leak detector 59 will be described. If the leak occurs by the double pipe condenser 44, the leaked coolant is collected in the water collecting unit 71, the water collected in the water collecting unit 71 is detected by the water leak detection unit 59 to control the room Delivered to unit 12. Then, the indoor control unit 12 transmits such a fact to the central control unit 13 to the administrator as a predetermined alarm signal.

The manager reports the alarm signal and quickly identifies which floor of the building has leaked, takes measures such as blocking the inflow of coolant to the indoor unit, and dispatches a repairman to repair the indoor unit. .

Since the indoor unit of the water-cooled air-conditioning system and the water-cooled air-conditioning system according to the present invention as described will be applied to a large building, it is possible to accurately grasp whether or not a leak occurred in a specific indoor unit of which floor of the entire building, so that the system is centralized. There is an advantage that can be managed intensively by the control unit. Furthermore, there is an advantage that the air conditioning system of the entire building can be controlled collectively by a few people.

On the other hand, in the description of the present invention has been described that the water collecting unit and the leak sensor is installed on the lower side of the indoor unit, in particular, the lower side of the double pipe condenser, so that the predetermined water collecting unit and the leak sensor is installed in a nearby position such as the periphery of the indoor unit. By doing so, it may be possible to more accurately manage the leakage.

Since the occurrence of leakage can be quickly and accurately known by the water-cooled air conditioning system and the indoor unit of the water-cooled air conditioning system, it is possible to quickly and accurately prevent the leakage of the opposite cooling water in the building.

In addition, by preventing the coolant from leaking, the amount of coolant is preserved, so that the entire water-cooled air conditioning system can be safely operated for the other layers in which the leak is not generated.

1 is a perspective view of a building to which the water-cooled air conditioning system of the present invention is applied.

2 is a diagram illustrating an internal configuration of each floor of a building.

3 is a system configuration diagram of a water-cooled air conditioning system according to the present invention.

4 is a perspective view of a water-cooled air conditioning system indoor unit.

5 is an exploded perspective view of the indoor unit.

6 is a change diagram of the cooling load according to the operation state of the compressor.

7 is a cross-sectional view taken along line II ′ of FIG. 5.

8 illustrates an embodiment of a leak sensor according to another embodiment.

9 is a block diagram of a water-cooled air conditioning system according to the present invention.

<Explanation of symbols for main parts of the drawings>

12: indoor control unit 13: central control unit 34: lower panel

44: double tube condenser 71: collecting part 72: contact sensor

73 float switch 74 electrode sensor 75 depression

Claims (9)

A compressor in which the refrigerant is compressed; A condenser in which the compressed refrigerant is condensed by contact with the cooling water; An evaporator which evaporates after the condensed refrigerant is expanded to absorb external heat; A collecting part placed under the condenser and collected when the cooling water leaks; And An indoor unit of a water-cooled air conditioning system including a leak sensor to detect the fact of leakage by the coolant collected in the collecting portion. The method of claim 1, The leak sensor is an indoor unit of a water-cooled air conditioning system that is an electrode sensor. The method of claim 1, The leak sensor is a contact sensor, wherein the contact sensor is an indoor unit of a water-cooled air conditioning system operated by a float switch suspended by the cooling water. The method of claim 1, The water collecting unit is an indoor unit of a water-cooled air conditioning system is formed with a depression that is recessed to collect the collected water. The method of claim 4, wherein The indoor unit of the water-cooled air conditioning system is formed inclined toward the recess. A plurality of indoor units in which the cooling water and the refrigerant are in contact with each other to perform heat exchange; An outdoor unit in which the cooling water is cooled; Leakage detection unit for detecting the leakage of the cooling water in the indoor unit; An indoor control unit receiving a signal indicating a leak when the leak is detected by the leak detector; And A water-cooled air conditioning system including a central control unit for displaying a specific indoor unit leaked by the detection signal of the indoor control unit. The method of claim 6, The water leak detection unit is located below the plurality of indoor units water-cooled air conditioning system. The method of claim 6, The water leak detection unit, the water-cooled air conditioning system is placed below the condenser in which the cooling water and the refrigerant in contact with the plurality of indoor units. The method of claim 8, And the condenser is a double tube condenser.