KR100929193B1 - Water Cooled Air Conditioning System - Google Patents

Abstract

The water-cooled air conditioning system according to the present invention includes a cooling tower, a water-cooled indoor unit installed in each indoor space in a building, a cooling water pipe connecting the cooling tower and the water-cooled indoor unit, and a cooling water flows therein, and a connection path between the indoor unit and the cooling water pipe. Interposed, a proportional control flow rate control valve is provided so that the amount of the coolant supplied to the indoor unit is linearly controlled to be controlled so that the amount of the coolant flowing into the water-cooled indoor unit is optimally controlled.

According to the present invention, since the amount of cooling water supplied to the indoor unit of the water-cooled air conditioner can be continuously linearly adjusted to an optimal level suitable for the cooling load of a specific room, the energy efficiency of the air conditioning system can be obtained. .

Water-cooled, air conditioning system, proportional control, flow control valve

Description

Air conditioning system cooled by water

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 an 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 water-cooled air conditioning system according to the present invention.

<Explanation of symbols for the main parts of the drawings>

11: proportional control flow control valve

The present invention relates to a water-cooled air-conditioning system, and more particularly, to a water-cooled air-conditioning system capable of actively coping with fluctuations in indoor cooling loads by controlling the amount of cooling water flowing in and out of the indoor unit side of the water-cooled air-conditioning system linearly. will be.

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 high advantage can be obtained.

On the other hand, in recent years, a large number of large skyscrapers are entering 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 to heat-exchange the cooling water, and the indoor unit is installed on each floor of the building to supply cooling water that is heat-exchanged in the outdoor unit to condense the refrigerant. In addition, the coolant heat-exchanged 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 double pipe condenser has a feature that the amount of heat of condensation depends on the amount of cooling water supplied to the indoor unit. In other words, unlike in the case of air cooling, when the supply amount of cooling water is excessively large, the amount of heat of condensation in the double tube condenser increases, so that liquid refrigerant that cannot be evaporated is supplied to the compressor, which may cause damage to the compressor. have. In addition, when the supply amount of cooling water is too small, a sufficient amount of heat of evaporation cannot be obtained. Therefore, a problem arises in that the room temperature cannot be kept as low as desired. This is because the double tube condenser is subjected to heat exchange in direct contact with the refrigerant and the cooling water.

Under the background described above, it is a major concern for the water-cooled air conditioning system to properly control the quantity of cooling water supplied to each indoor unit.

The present invention is proposed to solve the above problems, and an object of the present invention is to propose a water-cooled air conditioning system that can be optimally adjusted the amount of cooling water supplied to the indoor unit.

In addition, an object of the present invention is to propose a water-cooled air-conditioning system in which the amount of inflow of the indoor unit is optimally adjusted, thereby preventing damage to the indoor unit internal equipment and maintaining the efficiency of the air conditioning system optimally.

Water-cooled air conditioning system according to the present invention for achieving the above object is a cooling tower; A water-cooled indoor unit installed in each indoor space in the building; A cooling water pipe connecting the cooling tower with the water-cooled indoor unit and having a cooling water flowing therein; And a proportional control flow control valve intervening in a connection path between the indoor unit and the cooling water pipe so that the amount of cooling water supplied to the indoor unit is linearly controlled.

In another aspect, a water-cooled air conditioning system according to the present invention includes a water-cooled indoor unit for performing indoor air conditioning of a building; A proportional control flow control valve for controlling the amount of cooling water supplied to the water-cooled indoor unit; And an indoor control unit which senses an operating state of the indoor unit and adjusts an opening degree of the proportional control flow control valve so as to linearly adjust an amount of cooling water flowing into the indoor unit.

According to the present invention, there is an advantage that the amount of cooling water supplied to the indoor unit of the water-cooled air conditioning system can be optimally adjusted. In addition, since the amount of cooling water supplied to the indoor unit is optimally adjusted, breakage of parts of the indoor unit can be prevented and the operation efficiency of the air conditioning system can be obtained.

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, a building 1, a cooling tower 2 as an outdoor unit placed on a roof of a building, a water-cooled indoor unit 3 placed on each floor of the building, the cooling tower 2 and the water-cooled indoor unit Cooling water pipe (4) connecting the (3), the indoor duct (5) for allowing the air cooled by the water-cooled indoor unit (3) flow into each compartment of the room, and the end of the indoor duct (5) Included is a diffuser (6) provided in the to spread widely into the interior 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 this way, by supplying the amount of cooling water by the proportional control flow control valve 11, the amount of cooling water supplied to the water-cooled indoor unit 3 can be actively controlled in accordance with the operating state of the indoor unit. The proportional control flow rate control valve 11 is a valve capable of continuously increasing or decreasing the flow rate of the fluid passing through the valve by a predetermined input signal in which the height is indicated.

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 heated by heat exchange 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 after cooling by the cooling tower 2, It is supplied again through the supply passage (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.

As such, the reason why the coolant is to be controlled by the proportional control flow control valve 11 is that, although the cooling load is small, when a large amount of coolant is introduced, liquid refrigerant may flow into the compressor and the compressor may be damaged. This is because a sufficient cooling capacity cannot be obtained when a small amount of cooling water is introduced despite a large cooling load. This is because the water-cooled air conditioning system is different from the air-cooled air conditioning system because the heat transfer is performed by the direct heat transfer method by conduction between the refrigerant and the cooling water. Therefore, the amount of condensation heat of the double tube condenser is directly changed depending on the amount of cooling water supplied. to be.

On the other hand, each floor of the building is provided with a ventilator (not shown) that can directly enter the outside air, and a heat exchanger (not shown) is installed at the inlet / outlet of the ventilator, so that the outside air can be directly introduced. have.

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

4 is a perspective view of an indoor unit, and FIG. 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, and 43 may be operated by a plurality of compressors selectively, so that the operation state of the compressor may vary according to the cooling load of the indoor space, and a detailed description thereof will be described later.

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, in order to smoothly drain the condensed water generated while the refrigerant is evaporated in the evaporator 45, a drain pan 46 is disposed below 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, a drain hole 39 is formed in the side panel 35 to communicate with a portion of the drain pan 46. Below that, a coolant inlet hole 37 and a coolant outlet hole 38 for allowing coolant to flow into and out of the indoor unit 3 are formed.

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 combined and 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. do. 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. Furthermore, 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. In detail, a change in the operating state of the compressors 41, 42, 43 is sensed by the indoor control unit 12, and an appropriate amount of cooling water is determined by such a detection signal. In addition, in order to allow an appropriate amount of cooling water to pass through the proportional control flow control valve 11, a predetermined control signal for controlling the opening degree of the proportional control flow control valve 11 is controlled by the indoor control unit 12. At is to be transmitted to the proportional control flow control valve (11).

In addition, in order for the cooling water to be supplied in accordance with the amount of cooling water passing through the overall proportional control flow control valve 11 installed in the building, the operating state of the cooling tower 2 operates under the control of the central control unit 13. Be sure to

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

Referring to FIG. 7, 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 are provided. 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, a damper control unit 57 for adjusting the supply state of the cold air introduced into each space divided into a room, and a ventilation control unit 58 for controlling the inflow of the indoor air.

In particular, in the present invention, the valve drive unit 55 is included, so that the coolant of the optimum amount is supplied to the indoor unit 3 in accordance with the operating state of the indoor unit 3. Specifically, according to the operating state of the compressor placed inside the indoor unit 3, the valve drive unit 55 is operated to linearly control the flow rate of the cooling water passing through the proportional control flow control valve 11. do. In other words, as the cooling load in the room increases and the compressive capacity of the refrigerant compressed by the compressors 41, 42 and 43 increases linearly (see the vertical axis in FIG. 6), the proportional control flow control valve ( The valve drive 55 is controlled so that the opening degree of 11) is further opened linearly. On the contrary, as the cooling load in the room decreases and the compression capacity of the refrigerant compressed by the compressors 41, 42, 43 decreases linearly (see the vertical axis in Fig. 6), the proportional control flow control valve ( The valve drive 55 is controlled so that the opening degree of 11) is further linearly closed.

By operating in this way, the amount of cooling water supplied to the water-cooled indoor unit 3 is always kept in an optimal state, and the amount required for the condensation of the refrigerant to be compressed is supplied to the double tube condenser. Therefore, the compressor is not damaged due to the overcooling of the refrigerant, and there is no shortage of cooling capacity.

In addition, since the water-cooled air conditioning system according to the present invention is applied to a large building, since the system is intensively managed by the central control unit, there is an advantage that the entire building can be controlled collectively by a few people.

In addition, the air conditioning system of the present invention has been described taking the case of being used as a cooling system as an example, of course, in the case of heating operation can be easily achieved by operating the cycle in the reverse direction.

According to the present invention, since the amount of cooling water supplied to the indoor unit of the water-cooled air conditioner can be continuously linearly adjusted to an optimal level suitable for the cooling load of a specific room, the energy efficiency of the air conditioning system can be obtained. .

In addition, since the supercooling of the refrigerant that purifies the internal refrigeration cycle of the water-cooled indoor unit is prevented, there is an advantage of preventing damage to the indoor unit internal equipment.

In addition, when the compression capacity of the compressor is linearly variable, the condensation heat is variably controlled according to the compression capacity, whereby the use efficiency of the air conditioning system can be further improved.

Claims (8)

Cooling tower; A water-cooled indoor unit installed in each indoor space in the building; A cooling water pipe connecting the cooling tower with the water-cooled indoor unit and having a cooling water flowing therein; And And a proportional control flow control valve intervening in a connection path between the indoor unit and the cooling water pipe to variably control the amount of cooling water supplied to the indoor unit, At least one constant speed compressor and at least one inverter compressor are disposed inside the indoor unit, such that the compression capacity of the refrigerant is linearly varied. The method of claim 1, The proportional control flow control valve is a water-cooled air conditioning system that is variable controlled in proportion to the compression capacity of the compressor inside the indoor unit. The method of claim 1, The cooling tower is hermetic water-cooled air conditioning system. The method of claim 1, The proportional control flow control valve is a water-cooled air conditioning system to control the amount of cooling water linearly variable. A water-cooled indoor unit performing indoor air conditioning of the building; A proportional control flow control valve for controlling the amount of cooling water supplied to the water-cooled indoor unit; And An indoor control unit that linearly adjusts the amount of coolant flowing into the indoor unit by sensing an operation state of the indoor unit to adjust an opening degree of the proportional control flow control valve; And And a central control unit for receiving an operating state of the proportional control flow control valve from the indoor control unit and adjusting an operating state of the cooling tower. The method of claim 5, wherein The proportional control flow control valve is a water-cooled air conditioning system in which the opening degree is proportionally adjusted according to the compression capacity of the indoor unit. delete delete

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