KR100605022B1 - Regenerative Cooling and Air Conditioning System and Method Thereof - Google Patents

Abstract

The present invention discloses a compressor for compressing a refrigerant, a condenser for extracting heat from a compressed high temperature refrigerant, a condenser for expanding the condensed refrigerant, an expansion valve for expanding the condensed refrigerant, and water deprived of heat through heat exchange with a refrigerant compressed in the condenser. An outdoor unit circulation pump for circulating water, an outdoor unit fan installed on one surface of a dry cooler coil to create air flow, an outdoor temperature sensor for measuring the outside temperature, and a temperature of water passing through the cooling coil An outdoor unit having a cold water temperature sensor for reducing the temperature; An outdoor unit fan, a DX coil that directly expands the refrigerant having a lowered temperature from the condenser to lower the temperature, a cold water coil for circulating cold water at low temperature, an indoor unit circulation pump for circulating cold water, and The present invention relates to a heat storage type natural air conditioning cooling system including an indoor unit having an indoor temperature sensor for sensing a temperature around a cold water coil of an indoor unit, and a method of operating the same. The regenerative natural air conditioning cooling system and its operation method having such a configuration have an effect of reducing power consumption by using latent heat required for melting ice or shrinkage heat of cold water when ice use heat or shrinkage heat is high.

Air conditioner, ice heat storage, heat storage type, cooling, straight coil, cold water coil, phase change material, power saving

Description

Natural Air Conditioning Cooling System and Its Operation {Regenerative Cooling and Air Conditioning System and Method Thereof}

Figure 1 schematically shows a heat storage air conditioner according to the prior art.

2 is a block diagram showing the configuration of a heat storage type natural air conditioning cooling system using ice heat storage according to an embodiment of the present invention.

3 is a side view showing the indoor unit of the heat storage type natural air conditioning cooling system shown in FIG.

4 is a front view showing the outdoor unit of the heat storage type natural air conditioning cooling system shown in FIG.

5 is a front view showing a heat storage unit of the heat storage type natural air conditioning cooling system shown in FIG.

FIG. 6 is a flowchart illustrating an operation method of the heat storage type natural air conditioning cooling system shown in FIG. 2.

7 is a configuration diagram showing the configuration of a heat storage type natural air conditioning cooling system using shrinkage heat according to another embodiment of the present invention.

8 is a block diagram showing the configuration of a natural air conditioning cooling system according to another embodiment of the present invention.

FIG. 9 is a flowchart illustrating an operation method of the natural air conditioning cooling system illustrated in FIG. 8.

<Description of Symbols for Main Parts of Drawings>

100: indoor unit unit 110: indoor unit fan

112: duct 120: cold water coil

140: linear coil 160: indoor unit circulation pump

170, 270: expansion valve 200: outdoor unit

210: compressor 212: gauge

220: condenser 230: outdoor unit circulation pump

240: outdoor unit fan 250: cooling coil

272: dryer 273: sight glass

281: first solenoid valve 282: second solenoid valve

283: third solenoid valve 284: fourth solenoid valve

285: fifth solenoid valve 286: sixth solenoid valve

290, 292: check valve 300: heat storage unit

310: water tank 312: cold water valve

320: refrigerant coil 330: phase change material

340: refrigerant pipe 410: heat exchanger

The present invention relates to a natural air-conditioning air conditioner, and more particularly, to a heat storage-type air-conditioning air conditioner that cools and accumulates by operating a refrigeration cycle when the power usage cost is low, and uses ice storage heat or shrinkage heat when the power use cost is high. .

In general, an air conditioner using ice heat or shrinkage heat is used to make ice or cold water using low-cost late night power at night to reduce the cooling cost of summer, and then melts ice during the day, or uses the temperature difference between cold water and indoor air. Refers to equipment for cooling.

The ice storage system stores latent heat (80kcal / kg) generated when water phase changes to ice at 0 ° C, so the storage tank has a small volume and is applicable to downtown buildings. It consists of a cold storage tank, and an air conditioner using cold heat, and operates a freezer at midnight time to store cold heat in the cold storage tank, stops the freezer during the day, and circulates the cold heat of the heat storage tank in an air conditioner or a fan coil for cooling. When the cooling is insufficient only by the heat of the cold storage tank, the system is configured to operate together with the freezer.

1 is a view showing a super low-power natural air conditioning cooling system according to the prior art, which has been disclosed in Korean Patent Publication No. 1999-77492.

Referring to the drawings, an outdoor unit 20 having a compressor 21, a four-way valve 22, an outdoor heat exchanger 23, an outdoor expansion valve 25, and a gas-liquid separator 24, and an indoor heat exchanger 12. And a heat storage unit 30 having an indoor unit 10 having an indoor expansion valve 11, a heat storage expansion valve 32, and a heat storage heat exchanger 34, wherein the outdoor unit 20, a heat storage unit ( 30) and a heat storage air conditioner in which the indoor unit 10 is connected to form a refrigeration cycle, wherein the dryer is disposed between the HFC refrigerant and the heat storage heat exchanger 34 and the indoor heat exchanger 12 that distribute the refrigeration cycle. A regenerative air conditioner having 36) is disclosed.

However, the regenerative air conditioner of the above structure is just a system that can use a non-azeotropic mixed refrigerant HFC refrigerant or non-combustion refrigerant, and does not disclose a specific structure and operation method for saving electricity or fuel for energy saving.

Therefore, there is a need for a new energy-saving natural air conditioning cooling system that can solve the above problems.

The present invention has been made in view of the above-mentioned necessity. When the power usage cost is high using ice storage heat or shrinkage heat, it is necessary to reduce power consumption by using latent heat or cold water shrinkage heat required for melting ice, and to operate the ice. It is to provide a natural air conditioning cooling system that saves fuel costs.

In addition, another object of the present invention in the heat storage air-conditioning air conditioning system, by reducing the total volume by putting a temperature-setting phase change material (PCM) in the water in the heat storage tank, so that the air conditioner can be easily installed in a narrow space To provide a natural air conditioning cooling system.

In addition, another object of the present invention is that the operation and set temperature can be kept constant according to the irregular load form by time zone, type, and natural air conditioning that can effectively cope with the miniaturization and peak load of the product as well as improving the performance of the product To provide a cooling system.

In addition, another object of the present invention to provide a natural air conditioning cooling system that can be economically operated by the heat storage rate distribution when the load can be predicted according to the application field of the system.

The present invention for achieving the above object is a compressor for compressing the refrigerant from the linear coil in the room, a condenser to take heat from the compressed high-temperature refrigerant and condensation, an expansion valve for expanding the condensed refrigerant; A coil for circulating water depriving heat through heat exchange with the compressed refrigerant in the condenser, a circulation pump for circulating water along the coil, and an outdoor unit fan installed on one surface of the cooling coil to create a flow of air; And an outdoor unit having an outdoor temperature sensor for measuring the outdoor temperature, a cold water temperature sensor for measuring the temperature of water passing through the cooling coil, an outdoor unit fan, and a refrigerant having a temperature drop directly from the condenser. Direct cooling to lower the temperature, and to cool the room by circulating low-temperature cold water from the ice storage unit Be coil, the indoor circulation pump for circulating the water and an indoor unit including an indoor temperature sensor for sensing the temperature around the cold water coils in the indoor unit.

In addition, it is preferable to further include a heat storage unit for cooling and storing the water of the circulating water by using a low-temperature refrigerant, and for circulating the cold water to the indoor unit in the natural air conditioning mode.

At this time, the heat storage unit, a water tank for storing water to supply cold water to the cold water coil of the indoor unit, a refrigerant coil installed in the water tank to allow the refrigerant to flow, and the temperature of the water stored in the water tank It is preferable to have a temperature sensor of the water tank to be measured.

In addition, a first solenoid valve installed in a pipe connecting the cold water coil of the indoor unit to the outdoor unit, a second solenoid valve installed between the condenser and the outdoor unit cooling coil, and a pipe connected from the cold water coil to the first solenoid valve And a third solenoid valve installed in a pipe connecting the pipe connected from the condenser to the heat storage unit, a fourth solenoid valve for controlling cold water from the condenser and supplied to the heat storage unit, and from the condenser. It is preferable to further include a fifth solenoid valve and a sixth solenoid valve for controlling the supply of the refrigerant to be supplied to the linear coil of the indoor unit or toward the water tank.

Hereinafter, a preferred embodiment of a natural air conditioning cooling system according to the present invention will be described in detail with reference to the accompanying drawings.

First, it looks at the ice storage type natural air conditioning cooling system and its operation method according to an embodiment of the present invention.

Figure 2 is a schematic diagram showing the structure of the ice heat storage type natural air conditioning cooling system according to an embodiment of the present invention, Figure 3 is a cross-sectional view showing the indoor unit shown in Figure 2, Figure 4 is an outdoor unit respectively 5 is a front view illustrating the heat storage storage unit illustrated in FIG. 2.

Referring to the drawings, in the case of the computer room for year-round cooling, when the outside air temperature is low during the winter or the season, the water passes through the cold water coil 120 of the outdoor unit 200 and exchanges heat with the outside air to reduce the cold water temperature. It is a system that cools down and circulates to the indoor unit 100.

That is, the electric charge is the most expensive in the maximum load time of summer, so the refrigeration cycle is operated at the lowest night time when the electric charge is the lowest, and the cold air is stored in the water tank 310, and during the day time, the electric charge is the most expensive, so the refrigeration cycle is not operated. It is a system for cooling by operating only the indoor unit circulation pump (160).

The system includes an outdoor unit 200 and an indoor unit 100, and may further include a heat storage unit 300.

The indoor unit 100 includes an indoor unit fan 110, a cold water coil 120 for circulating the cooled water stored in the daytime zone, and a room temperature for sensing a temperature of the cold water coil 120. A sensor (not shown) and a linear coil 140 are included.

In addition, the outdoor unit 200, the outdoor unit fan 240, the cooling coil 250 through which the water cooled by the cold outside air flows and the outdoor unit circulation pump 230 for the circulation of cold water, and the cooling cycle of the refrigerant A compressor 210, a condenser 220, expansion valves 170 and 270, and solenoid valves 281, 281, 283, 284, 285 and 286 for controlling the flow of the cold water and the refrigerant are installed.

In addition, the heat storage unit 300 is a water tank 310 for storing the cooled water, the refrigerant pipe 340 is installed in the water tank 310, the refrigerant is supplied to cool the water, and Refrigerant coil 320 for lowering the temperature of the water through heat exchange with water in the water tank 310 by widening the surface area of the refrigerant pipe 340, and a water tank temperature sensor for sensing the temperature of the water in the water tank 310 (Not shown) may be provided, and if necessary, the phase change material 330 having a latent heat of about 10 times larger than water may be included.

Unexplained 112 is a duct, 212 is a gauge, 272 is a dryer, 273 is a sight glass, and 290 and 292 are check valves.

The operation of the system of this structure is shown in FIG.

Referring to the drawing, when the power is turned on first (S100), the indicator light is turned on in the display window (S110), and when the operation switch is pressed (S120), the indoor unit fan 110 is turned, the indicator (S130) is turned on and the system is turned on. It works.

At this time, the indoor set temperature is compared with the indoor temperature (S150), if the indoor temperature is lower than the indoor set temperature, the machine stops the operation (S160) to prevent cooling, the room temperature is higher than the indoor set temperature and the outside temperature When comparing the set outside temperature (S170) and the outside temperature is lower, the machine is operated in the natural air conditioning operating mode (S180).

In the natural air conditioning operation mode (S180), the compressor 210 and the refrigeration cycle associated solenoid valves 282, 283, 285, and 286 are closed, and the first solenoid valve 281 and the fourth solenoid valve 284 are opened. The indoor unit circulating pump 160 and the outdoor unit circulating pump 230 operate to cool the outside air and send cold water to the indoor air. The electricity is not consumed except for the power of the circulation pumps 160 and 230.

That is, in general, since the maximum power consumption of the compressor 210 in the cooling system, the compressor 210 is not to be operated during the season or winter season, the electric charge is significantly saved.

At this time, if the room temperature is higher than the indoor set temperature, and the outside temperature is higher than the set outside temperature, the process goes to the peak time operation mode (S190).

The peak time operation mode (S190) is divided into a cooling operation mode (S210), a general operation mode (S220), and a cold storage operation mode (S140) according to a time setting (S200).

For example, the time setting of the peak time operation mode (S190) is the maximum load electric charge time zone (for example, between 10 o'clock and 12 o'clock) is the air-cooling operation mode (S210), and the middle load electric charge time zone (for example, 8 o'clock to 10 o'clock, 12 o'clock to 14 o'clock, 17 o'clock to 22 o'clock, the normal operation mode (S220), light load electricity time zone (for example, between 22 o'clock and 8 o'clock) is the cold storage mode ( S140).

The cold-cooling operation (S210) is an operation method of cooling the cold cold water, which has been cooled by not operating the freezer, by moving only the indoor unit circulation pump 160 to the indoor unit cold water coil 120 for cooling. At this time, the indoor unit circulation pump 160 and the indoor unit fan 110 are turned on, and the compressor 210 and the outdoor unit fan 240, the outdoor unit circulation pump 230, and the refrigeration cycle related valves 281, 282, 285, and 286 are Off to save power.

Looking at the operation of the cooling operation (S210), the operation is performed by the time setting and the temperature conditions, the first solenoid valve 281 and the fourth solenoid valve 284 is opened and the second, third, fifth and sixth Solenoid valves 281, 282, 285, and 286 are closed.

Therefore, the compressor 210 stops, and only the indoor unit circulation pump 160 operates to circulate the cold water in the water tank 310 to the cold water coil 120 in the room, thereby cooling.

In addition, the general operation (S220) is a mode that operates the refrigerator and the indoor unit circulation pump 160 stops the operation to operate in conjunction with the linear coil 140 of the indoor unit as a normal constant temperature and humidity.

Looking at the operation of the general operation (S220), when the temperature or humidity detected by the temperature and humidity sensor (not shown) is higher than the set temperature and humidity, the control unit performs a normal cooling operation by the cooling signal, the general cooling operation (S220) In order of the sixth solenoid valve 286, the compressor 210 is started, whereby the refrigerant compressed by the compressor 210 passes through the water-cooled condenser 220, and the high temperature and high pressure gas is converted into the high temperature and high pressure liquid. Condensation, and the refrigerant passing through the condenser 220 expands in the expansion valve 170 via the sixth solenoid valve 286 to change into a liquid of low temperature and low pressure as the temperature and pressure drop.

The low temperature low pressure liquid is evaporated from the inside while passing through the linear coil 140 to be a low temperature low pressure gas, and is sucked into the compressor 210 to form a cycle.

The cold storage operation (S140) is a mode that cools the cold air in the water tank 310 by operating the refrigerator at the cheapest time of the electric charge to drop the water temperature of the water tank 310 to 0 ~ 1 ℃. The compressor 210, the indoor / outdoor circulation pumps 160, 230, and the outdoor unit fan 240 operate, and the solenoid valves 282, 283, 285 are opened for the operation of the refrigeration cycle, and the indoor unit fan 110 is turned off. It is a method of saving electricity consumption in the daytime zone as much as possible by storing it as much as possible in the late night hours when electricity fee is low.

At this time, the refrigerant is passed through the water-cooled condenser 220, the refrigerant pipe 340 in the water tank 310 and the refrigerant coil 320 connected thereto to cool the water and then back to the compressor 210 to circulate again, Meanwhile, water whose temperature is lowered in the outdoor unit fan 240 and the water-cooled condenser 220 is circulated by the circulation pump 230.

Even when operating in the peak time mode (S190), if the temperature of the water tank 310 is higher than the set temperature, the compressor 210, the indoor air circulation pump (160, 230), the indoor air fan (110, 240) is operated, While accumulating, the temperature is lowered to a set temperature, and the cooling function works in conjunction with the linear coil 140.

In addition, in order to reduce the volume of the water tank 310, the temperature setting phase change material 330, which may have 10 times more latent heat than water, may be put in the water tank 310 to reduce the capacity, thereby, cooling the whole. The area and space occupied by the system can be reduced so that it can be installed in a confined space, thereby achieving an economically beneficial effect.

Next, by using the heat of shrinkage stored in the water tank 310 according to the present invention for cooling of the peak time, when the outside air temperature is low in the winter or season, the water passes through the cold water coil 120 of the outdoor unit and exchanges heat with the outside air. While the cold water temperature is dropped to circulate indoors and looks at the shrinkage heat type natural air conditioning cooling system and its method.

Figure 7 is a block diagram showing the shrinkage heat type natural air conditioning cooling system.

Referring to the drawings, electricity charges are high during the maximum load time in summer, so the coolant is stored in the water tank 310 at the lowest night time when electricity charges are low, and the heat is stored. It is a system for cooling by operating only the pumps 160 and 230, but the cooling time is shorter than the ice storage heat in a shrinkage heat method in which water is kept at a low temperature without freezing water.

In addition, the shrinkage heat system is equipped with a cold water valve 312 and the plate heat exchanger 410 in the heat storage unit 300 compared to the ice heat storage system shown in Figure 2 and 5, the plate heat exchanger 410 As a result, the cool air of the refrigerant cools the water in the water tank 310 through heat exchange, and supplies cold water to the indoor unit 100 through the cold water valve 312.

Since the method of operating the shrinkage heat type system is similar to the ice heat storage type low air conditioning air conditioning system shown in FIG. 6, it will be described with reference to FIG.

Referring to the drawings, when the power is turned on first (S100), the indicator light indicating that the power is turned on is displayed (S110), and when the operation switch is pressed (S120), the indoor unit fan 110 turns to turn on the indicator (S130).

In this operation, when the room temperature is lower than the indoor set temperature, the machine stops operation (S160), and when the room temperature is higher than the indoor set temperature and lower than the outside temperature and the set outside temperature, the machine operates in the natural air conditioning mode (S180). do

In the natural air conditioning mode (S180), the solenoid valves 282, 285, and 286 for operating the compressor 210 and the refrigeration cycle are closed, and the indoor unit circulation pump 160 and the outdoor unit circulation pump 230 operate, and cold outside air. Cool the water and send it to the room to cool it.

The above system does not consume electricity other than the power of the circulating pumps 160 and 230, thereby saving electric charges, and thus reducing the electric charges for the operation of the system.

If the room temperature is higher than the room set temperature and the outside temperature is higher than the set outside temperature, the control unit 100 returns to the peak time operation mode (S190).

Time setting in the peak time operation mode (S190), the maximum load electric charge time zone (10:00 ~ 12:00, 14:00 ~ 17:00) is a cold-cooling operation (S210), the intermediate load electric charge time zone (08: 00 ~ 10:00, 12:00 ~ 14:00, 17:00 ~ 22:00) is the normal operation (S220), light load electricity time zone (22:00 ~ 08:00) is the cold storage operation (S140) Can be set.

At this time, the cold-cooling operation (S210) is a method of cooling and cooling the cold cold water stored in the indoor unit cold water coil 120 by operating only the indoor unit circulation pump 160 without cooling the refrigerator. To this end, the indoor unit circulation pump 160 and the indoor unit fan 110 are turned on, and the compressor 210 and the outdoor unit fan 240, the outdoor unit circulation pump 230, and the solenoid valves 281, 282, 284, 285, 286) is off to save power.

That is, by operating the time setting and temperature conditions, by opening the cold water valve 283 and operating only the indoor unit circulation pump 160, by circulating the cold water in the water tank 310 to the cold water coil 120 in the room to cool Done.

In addition, the general operation (S220) operates the refrigerator and the indoor unit circulation pump 160 stops the operation to operate in conjunction with the linear coil 140 of the indoor unit to operate like a normal constant temperature and humidity.

Looking at the operation of the general operation (S220), when the temperature or humidity detected by the temperature and humidity sensor is higher than the set temperature and humidity, the general cooling is made by the cooling signal of the controller (not shown).

In the cooling operation sequence, when the sixth solenoid valve 286 of the indoor linear coil 140 is opened, the compressor 210 is started, whereby the refrigerant compressed by the compressor 210 passes through the water-cooled condenser 220 at a high temperature and high pressure. Gas will condense into the liquid at high temperature and high pressure.

The refrigerant passing through the condenser 220 expands in the expansion valve 170 via the sixth solenoid valve 286 to change into a low-temperature low-pressure liquid as the temperature and pressure drop, and passes through the straight coil 140. Evaporated to become a gas of low temperature and low pressure, and is again sucked into the compressor 210 to form a cycle.

In addition, the cold storage operation (S140) by operating the refrigeration machine at the cheapest time for the electric charge to cool the cold air in the water tank 310 to drop the water temperature of the water tank 310 to 0 ~ 1 ℃, compressor 210, By turning on the indoor and outdoor air circulation pumps 160 and 230, the outdoor unit fan 240, and the solenoid valves 282, 283, 284, and 285 related to the refrigeration cycle, and the indoor unit fan 110 are turned off, the electric charges are stored as low as possible during the late night time. This is the way to save electricity consumption in the daytime zone.

That is, the second to fifth solenoid valves 282, 283, 284, and 285 are opened during the cold storage operation time period by the time setting and the temperature condition, and the compressor 210 is started, and the refrigerant passes through the water-cooled condenser 220. The plate heat exchanger 410 exchanges water with water to cool the water circulated to the water tank 310 and then circulates the compressor 210 again. The water for condensation is cooled by the outdoor unit fan 240 to enter the water tank 310 through the cold water valve 312 to the water cooled in the water-cooled condenser 220, thereby circulating it to play a condensation role.

Even when operating in the peak time mode (S190), if the temperature of the water tank 310 is higher than the set temperature, the compressor 210, the indoor air circulation pump (160, 230), the indoor outdoor fan (110, 240) is turned on and stored cold While cooling the temperature in conjunction with the linear coil 140 while lowering the temperature to the set temperature is the same as the ice-cooled natural air conditioning air conditioner (see Figs. 2 to 6).

All the above operation is made by automatic control, it is operated by the temperature and humidity sensor, and stopped, a control unit (not shown) for this may be further added.

Next, as another embodiment of the present invention, look at the DRY COOLER-type natural air conditioning cooler.

Such a system is shown in FIG. 8, and is economical because the number of parts is lower than that of the heat storage type of FIGS. 2 and 7, but the electric power saving effect is slightly reduced. It is a system that circulates water to the cooling coil 250 of the outdoor unit which is a dry coil (DRY COIL) and cools it with cold cold water only when the outside air temperature is lower than the set value.

9 is a diagram illustrating an operation method of the system. Referring to the drawings, when the power is turned on first and the operation switch S10 is turned on, the display window is turned on (S20), and the operation switch and the indoor unit fan are turned on (S30 and S40).

At this time, when the indoor temperature is lower than the indoor set temperature, the entire operating device is turned off (S60), and when the indoor temperature is higher than the indoor set temperature, the set outdoor temperature is compared with the outside temperature (S70). It is operated by the air conditioning operation (S80).

The natural air conditioning operation (S80) stops the operation of the compressor 210, the outdoor unit circulation pump 230 and the indoor outdoor fan (110, 240) is operated, the refrigeration cycle-related solenoid valves (282, 284) is closed and the indoor unit The circulation solenoid valves 281 and 283 of the circulation pump 160 are open to circulate and cool the cold water only by the power of the indoor unit circulation pump 160.

In this operation sequence, when the power is turned on (S10) the display window is turned on (S20), when the operation switch (S30) is turned on, the indoor unit fan 110 is operated (S40).

At this time, when the indoor temperature is lower than the indoor set temperature, the power of the system is cut off and stopped (S60). When the indoor temperature is higher than the indoor set temperature, the set outside temperature is compared with the outside temperature (S70).

And when the room temperature is higher than the indoor set temperature, the system is operated in the normal cooling mode (S90), which is the compressor 210 and the indoor air fan (110, 240) is turned on, the refrigeration cycle-related solenoid valves (282, 284) It is opened and cooled by normal cooling operation.

All the above operation is made by automatic control, it is operated by the temperature and humidity sensor (), and stopped, a control unit (not shown) for this may be further added.

As described above, the ultra-low power natural air conditioning cooling system according to the present invention provides the following effects.

First, when the power use cost is high using ice storage heat or shrinkage heat, latent heat required for melting ice may be used to reduce power consumption, thereby reducing fuel costs required for operation. That is, the time control is controlled according to the peak time electric charges to save the electric charges as much as possible, and can save electricity by making the most of the cold heat of the outside air.

Second, in the heat storage air-conditioning air conditioning system, the temperature setting phase change material is added to the water inside the heat storage tank to reduce the total volume, thereby providing an effect that the air conditioner can be easily installed even in a narrow space. Temperature setting phase change material can be used as an option to heat up much more heat than water tank volume for long time use.

Third, the operation and set temperature can be kept constant according to the irregular load type according to the time zone and type, thereby providing the effect of improving the performance of the product as well as miniaturizing the device and effectively coping with the peak load.

Fourth, when the load can be predicted according to the application field, economical operation by the heat storage rate distribution is possible, and during the daytime, only the circulation pump is operated to cool, thereby providing an effect of reducing noise.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.

Claims (10)

Compressor for compressing the refrigerant from the indoor linear coil, a condenser to take heat from the compressed high-temperature refrigerant to condense the refrigerant, an expansion valve for expanding the condensed refrigerant, and the compressed refrigerant in the condenser An outdoor unit circulation pump for circulating water for heat exchange, an outdoor unit fan installed on one surface of a cooling coil to cool water flowing through the cooling coil, an outdoor temperature sensor for measuring an outside temperature, and the cooling An outdoor unit having a cold water temperature sensor for measuring a temperature of water passing through the coil; The linear expansion coil directly expands the refrigerant having a lowered temperature from the condenser, a cold water coil for circulating cold water at low temperature, an indoor unit circulation pump for circulating the cold water, and a temperature around the cold water coil of the indoor unit. Natural air conditioning cooling system comprising an indoor unit having an indoor temperature sensor for sensing. The method of claim 1, And a heat storage unit for cooling and storing the circulated water by using a low-temperature refrigerant, and circulating the cooled circulating water to the indoor unit in a natural air conditioning mode, wherein the heat storage unit includes the indoor unit. A water tank for storing water to supply cold water to the cold water coil of the unit, a refrigerant pipe and a refrigerant coil installed in the water tank to allow the refrigerant to flow, and a temperature of the water tank for measuring the temperature of the water stored in the water tank Natural air conditioning cooling system with a sensor. The method of claim 2, A first solenoid valve installed in a pipe connecting the cold water coil of the indoor unit to the outdoor unit, a second solenoid valve installed between the condenser and the outdoor unit cooling coil, and the cold solenoid valve from the cold water coil to the first solenoid valve. A third solenoid valve installed in a pipe connecting a pipe connected to the heat storage unit from a pipe connected to the heat storage unit, and a fourth solenoid valve for controlling cold water from the condenser to be supplied to the heat storage unit; And a sixth solenoid valve and a sixth solenoid valve for controlling the supply of the refrigerant from the condenser to the linear coil of the indoor unit or toward the water tank. The method of claim 2, The natural air conditioning cooling system is a natural air conditioning cooling system, characterized in that for using the heat exchanged with the compressed refrigerant to replace the temperature set phase change material (PCM). If the room temperature is lower than the room temperature, the machine will stop.If the room temperature is higher than the room temperature and the outside temperature is lower than the room temperature, the machine will operate in the natural air conditioning mode, and the room temperature will be higher than the room temperature. The method for operating the natural air conditioning cooling system of claim 2, wherein the air conditioner is operated in a peak time operating mode when the air temperature is higher than the set outside temperature. The method of claim 5, In the natural air conditioning operation mode, the solenoid valves related to the compressor and the refrigeration cycle are closed, and the circulating water is supplied to the indoor unit by lowering the temperature of the circulating water by cold outside air while the circulating water passes through the outdoor unit cooling coil by the outdoor unit circulation pump. By the circulation pump of the indoor unit circulates the cold water coil of the indoor unit, enters the cooling coil of the outdoor unit again, the circulation is made, In the peak time operation mode, when the temperature of the water tank is lower than the set temperature in the cooling operation time zone, it is operated in the cooling operation mode, and the water tank temperature is set when the room temperature is higher than the set temperature or when the indoor temperature is higher than the set temperature. When the temperature is higher than the temperature is operated in the normal cooling operation mode, when the temperature of the water tank as the storage time is higher than the target temperature of the cooling storage, the operation method of the natural air conditioning cooling system characterized by consisting of three modes of operation in the storage cooling operation mode. The method of claim 6, The refrigeration operation does not operate the refrigerator, the solenoid valves related to the compressor, the outdoor fan, the pump, and the refrigeration cycle are closed, and the cold cold water that has been cooled is transferred to the indoor unit cold water coil by cooling only by the indoor unit circulation pump, and the circulation water is The cold stored cold water is supplied from the water tank to the indoor unit by the indoor unit circulation pump, circulates along the cold water coil of the indoor unit, and the indoor unit fan is operated. After cooling the room, the third solenoid valve is opened again into the water tank. In circulation, The general operation is to operate the refrigerator, the pump stops the operation to operate in conjunction with the linear coil of the indoor unit to cool the room, the refrigerant is passed through the compressor, condenser, expansion valve in order to enter the indoor unit circulating along the linear coil After cooling the room, it goes back into the compressor and circulates. The cold storage operation is to cool the air in the water tank by operating the refrigerator at the cheapest time of the electric charge to reduce the water temperature of the water tank to 0 to 1 degrees Celsius, the refrigerant by the outdoor unit pump is the compressor, the condenser, the outdoor unit The temperature drops while passing through the cooling coil and the expansion valve in turn, and the refrigerant enters the water tank to lower the temperature of the circulating water so that the circulating water of the water tank circulates the cold water coil of the indoor unit by the indoor unit circulation pump, and then the third solenoid valve The method of operating a natural air conditioning cooling system, characterized in that the circulation through the water tank again. The method of claim 5, In the peak time operation mode, when the temperature of the water tank is higher than the set temperature, the compressor, the indoor air pump, the indoor outdoor fan is turned on and cools down and drops the temperature to the set temperature, and works in conjunction with the linear coil. Operation method of a natural air conditioning cooling system characterized in that. If the room temperature is lower than the indoor set temperature, the machine will stop operation.If the room temperature is higher than the indoor set temperature and the natural air set temperature is lower than the outside temperature, operate the natural air conditioner.The indoor set temperature is higher than the room temperature. When the set temperature is higher than the outside temperature, the normal cooling operation, characterized in that the operating method of the natural air conditioning cooling system of claim 1. The method of claim 9, The natural air conditioning operation does not operate the compressor, the second solenoid valve and the fourth solenoid valve are closed, the outdoor unit pump and the outdoor unit fan are operated, the indoor unit fan is operated, the first solenoid valve and the third solenoid valve are opened. , In the general cooling operation, a compressor, an outdoor unit fan is operated to operate a cooling cycle using a refrigerant, a second solenoid valve and a fourth solenoid valve are opened, and the first solenoid valve and the third solenoid valve are closed. Operation method of cooling system.

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