KR101348250B1 - Multipurpose cooling system by controlling flow of brine - Google Patents

Abstract

The present invention relates to a cooling system for delivering cooling power of coolant cooled using an AC cooler to a phase-change material (PCM) through a heat exchanger of a cold storage tank and for distributing the cooling power of the cold storage tank to a plurality of cooling apparatuses having different cooling temperatures through a brine, and includes: a first cooling apparatus having the lowest cooling temperature for receiving the total amount of the brine flow discharged from the cold storage tank; and one or more second cooling apparatus having cooling temperature higher than the first cooling apparatus and receiving a part of the brine flow discharged from the first cooling apparatus. A multipurpose cooling system according to the present invention is capable of cooling a plurality of cooling apparatuses using stored cooling power, more specifically, is capable of cooling a plurality of cooling apparatuses having different cooling temperatures with only one cold storage facility which cools down a cooling apparatus having the lowest cooling temperature without additional facilities. [Reference numerals] (AA) Coolant out; (BB) Coolant in; (CC) PCM/evaporator (container); (DD) Freezing system; (EE) Refrigerating system; (FF) Cooling system

Description

Multipurpose cooling system by controlling flow of brine

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-purpose refrigeration system using a brine flow distribution. Specifically, the refrigeration is stored in a phase-change material (PCM) of a cold storage tank using electricity in a late-night time zone with low electricity consumption. By using this, it distributes and supplies to a plurality of cooling devices, but first cools by supplying the cooling device with the lowest cooling temperature zone and reuses the discharged brine to the cooling device, which is the middle and higher cooling temperature zones, to cool the lowest cooling temperature zone. The present invention relates to a multipurpose storage cooling system capable of cooling a plurality of cooling devices having different cooling temperature ranges without additional equipment only by the storage storage tank equipment that cools the equipment.

In general, the refrigeration / refrigeration / cooling products are applied to the principle of the refrigeration cycle that the phase change is made by the compression, condensation, expansion, evaporation of the refrigerant, and thereby cooling the inside by heat exchange.

Therefore, each product includes a compressor that compresses refrigerant, a condenser that condenses, an expansion valve that expands, and an evaporator that absorbs heat from the atmosphere, and each product consumes a lot of power during operation.

As the number of places to store low-temperature foods such as convenience stores and supermarkets increases and global warming accelerates to increase the use of air conditioners for indoor air conditioning, it not only increases consumption of electric energy but also deepens summer peak load, Energy shortages such as blackouts are occurring every year due to shortage of electric power and shutdown of nuclear power plants.

Accordingly, researches on energy savings using ice heat storage have been actively conducted, but they have not been activated until now and have not effectively reduced daytime power consumption.

In addition, as described above, refrigeration cycles are applied to each of the cooling products, resulting in a large amount of energy consumption, and when the refrigeration cycle of the cooling products installed in the room is operated, the operation noise of the compressor and the fan and the heat generated by the condenser Efficiency, such as temperature and energy thermal management, is falling.

Therefore, there is a need for the development of a multi-purpose refrigeration system that can provide high thermal management efficiency and use low-cost late night power.

As a prior art, Patent Document 1 relates to a refrigeration showcase having a refrigeration system, and proposes a refrigeration showcase for cooling a PCM with a refrigerator and circulating brine to cool the heat exchange passage, but the refrigeration tank and the showcase are not separated and stored. The volume is small and the noise and heat dissipation caused by the cooler cannot maintain a pleasant environment.

1. Korea Patent Registration No. 10-1209482

The present invention has been made in accordance with the necessity as described above, to remove the refrigeration / refrigeration / cooling equipment or a plurality of refrigeration equipment, refrigeration equipment or air conditioners installed in order to overcome the limitations of the conventional cooling device using a PCM. And supply and distribute one PCM cold storage tank cold air to each of the distributed devices, and supply it to the cooling device having the lowest cooling temperature zone to cool it, and reuse the discharged brine again in the cooling device of intermediate and higher cooling temperature zones. The present invention relates to a multi-purpose storage cooling system using a brine flow rate distribution system capable of cooling a plurality of cooling devices having different cooling temperature ranges without additional equipment by only an storage cooling tank facility for cooling a low cooling device.

The multi-purpose storage cooling system using the brine flow rate distribution according to the present invention for the above problem to be solved, transfers the cooling power of the refrigerant cooled by the AC refrigerator to the phase-change material (PCM) through the heat exchanger of the storage tank, The cold air of the cold storage tank is distributed and supplied to the plurality of cooling devices having different cooling temperature ranges through brine, and the first cooling device and the brine flow rate discharged from the first cooling device are supplied with the entire amount of the brine flow rate supplied from the cold storage tank. At least one second cooling device which is partly supplied and supplied, wherein the cooling temperature zone of the second cooling unit is higher than the cooling temperature zone of the first cooling unit.

As an embodiment of the present invention, the apparatus further includes a three-way valve installed in a brine tube through which brine is discharged from the first cooling device to adjust a flow rate of brine supplied to the second cooling device. Among the brine discharged, the brine which is not supplied to the second cooling device is introduced directly into the storage tank.

As an embodiment of the present invention, when the cooling of the second cooling device is not necessary, the entire amount of the brine flow rate discharged from the first cooling device by adjusting the three-way valve is directly introduced into the storage cooling tank.

In one embodiment of the present invention, the flow rate of the brine supplied to the second cooling device when the temperature of the PCM measured in the temperature measuring unit and the temperature measuring unit located inside the storage cooling tank is higher than the set temperature It further comprises, and the control unit for adjusting the opening and closing degree of the three-way valve to reduce the flow rate of the brine supplied to the second cooling device when the temperature is lower than the set temperature.

As an embodiment of the present invention, the storage tank is characterized in that the brine tube circulated brine by the circulation pump therein and the refrigerant pipe to which the refrigerant is transferred by the AC refrigerator are alternately installed to exchange cold air.

In one embodiment of the present invention, the plurality of cooling devices are characterized in that it comprises a tubular heat exchanger, the second cooling device is located in the brine tube discharged to prevent the reverse flow of brine flowing into the storage tank It characterized in that it further comprises a check valve.

In another embodiment of the present invention, the brine flow rate discharged from the second cooling device is distributed and supplied, characterized in that it further comprises at least one third cooling device having a cooling temperature band higher than the second cooling device.

According to the present invention, by supplying a brine cooled by using cold air stored in a PCM cold storage tank to a cooling device using a pump, an unbalance of power demand can be solved to achieve leveling of power demand.

In addition, there is no operating noise of the compressor, condenser, expansion valve, etc. installed in the conventional cooling device, and there is no heat dissipation loss due to the heat exchanger, so that a pleasant indoor environment can be maintained, energy efficiency can be improved, and the device can be simplified to have a small size or an internal storage area. Can be maximized.

In addition, a plurality of cooling units having different cooling temperature ranges are provided only by an accumulator, which cools the cooling unit having the lowest temperature range by re-using the brine discharged to the cooling unit having the lowest cooling temperature range and reusing the discharged brine again to the cooling unit having an intermediate or higher temperature range. The device can be cooled without additional equipment.

1 is a block diagram showing a multi-purpose storage cooling system using the brine flow distribution in accordance with the present invention.
Figure 2 is a block diagram showing a multi-purpose storage cooling system using the brine flow distribution according to another embodiment of the present invention.
Figure 3 is a block diagram showing a cold storage tank cooling system of the multi-purpose cold storage system according to the present invention.
4 is a cross-sectional view showing a cold storage tank of the multi-purpose cold storage system according to the present invention.
Figure 5 is a block diagram showing a multi-purpose storage cooling system using the brine flow distribution according to another embodiment of the present invention.
6 is a view showing the brine flow rate distribution according to the temperature zone of the cooling apparatus according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings illustrate only the essential features of the invention in order to facilitate clarity of the invention and are not to be construed in a limiting sense since they are not shown in the accompanying drawings.

Multi-purpose storage refrigeration system of the present invention can be classified into a refrigeration / refrigeration / cooling device according to the purpose of use and temperature, it is described as a 'cooling device' as a representative expression.

1 is a block diagram showing a multi-purpose storage cooling system using a brine flow distribution according to the present invention, Figure 2 is a block diagram showing a multi-purpose storage cooling system according to another embodiment of the present invention, the multi-purpose storage cooling system 100 storage , A first cooling device 210, and a second cooling device 220.

The storage cooling tank 100 transmits the cooling power of the refrigerant cooled by the AC refrigerator to the PCM through the heat exchanger of the storage cooling tank 100, and the plurality of cooling apparatuses having different cooling temperature ranges through the brine through the brine. Supply to dispense.

The first cooling device 210 has the lowest cooling temperature band among the plurality of cooling devices, and the entire amount of the brine flow rate supplied from the storage cooling tank 100 is supplied. The brine tube 300 discharged brine from the cold storage tank 100 is composed of one and directly connected to the first cooling device 210 may be supplied with the entire amount of the brine flow rate discharged from the cold storage tank (100). The equipment for accumulating the PCM and the PCM may be configured to a specification capable of efficiently cooling the first cooling device 210 having the lowest cooling temperature range, and brine may efficiently cool the first cooling device 210. Can be discharged from the cold storage tank.

The second cooling device 220 has a cooling temperature range higher than that of the first cooling device 210, and the brine discharged from the first cooling device 210 is distributed to supply a portion of the flow rate. At least one second cooling device (220). One brine tube 300 from which the brine is discharged from the first cooling device 210 is derived in plural so as to be connected to the one or more second cooling devices 220 and the cold storage tank 100, and the second cooling device 220 Connected to each of the brine discharged from the first cooling device 210 may be distributed to supply a portion of the flow rate.

The brine flow rate distribution can be used to cool a plurality of chillers having different cooling temperature ranges without additional equipment only by the cold storage facility that cools the chiller having the lowest cooling temperature range. The cooling temperature range of the second cooling device 220 is higher than the cooling temperature range of the first cooling device 210, so that the first cooling device 210 may be cooled, and the brine discharged may be supplied to cool the cooling temperature. As shown in FIG. 1, the second cooling device 220 includes a second cooling device 220 higher than the cooling temperature range of the first cooling device 210. Alternatively, as shown in FIG. 2, a plurality of second cooling devices 220 having the same cooling temperature range may be configured, and second cooling devices 220 having different cooling temperature ranges may be configured. When the plurality of second cooling devices 220 are included, the flow rate required by the plurality of second cooling devices 220 may not exceed the flow rate discharged from the first cooling device 210. That is, when the flow rate required for cooling the second cooling device 220 is 30% of the flow rate discharged from the first cooling device 210, the second cooling device 220 includes up to three.

The multi-purpose refrigerating system further includes a three-way valve 310. The three-way valve 310 may be installed in the brine tube 300 through which brine is discharged from the first cooling device 210 to adjust the flow rate of brine supplied to the second cooling device 220. That is, the brine discharged from the first cooling device 210 may be distributed to supply the required flow rate to the second cooling device 220. The brine flow rate that is not supplied to the second cooling device 220 may directly flow into the storage tank 100.

When the cooling of the second cooling device 220 is not necessary, the entire amount of the brine flow rate discharged from the first cooling device 210 may be directly introduced into the storage cooling tank by adjusting the three-way valve 310. In the case of including a plurality of second cooling devices 220, each of the cooling devices that do not require cooling may be blocked, and all of the plurality of second cooling devices 220 may be blocked. When the brine supply to the second cooling device 220 is cut off, the brine may directly flow into the storage cooling tank 100 in the entire flow rate.

The multipurpose refrigeration system further includes a temperature measuring unit and a control unit. The temperature measuring unit may be located in the storage cooling tank 100 and measure the temperature of the PCM, and the controller may adjust the opening and closing degree of the three-way valve 310 according to the measured temperature of the PCM. Can adjust the flow rate of the brine flow rate. When the temperature of the PCM measured from the temperature measuring unit is higher than the set temperature, the flow rate of brine supplied to the second cooling device 220 is increased, and when the temperature is lower than the set temperature, the second cooling device 220 is supplied to the second cooling device 220. The brine flow rate supplied can be reduced. That is, when the latent heat of the PCM decreases over time, the sensor of the temperature measuring unit installed in the cold storage tank may be sensed so that the opening and closing degree of the three-way valve 310 may be automatically adjusted to decrease or decrease the flow rate of the brine supplied. If the latent heat of PCM is reduced, the chiller will increase the flow rate to maintain the required cooling reference.

3 is a configuration diagram showing a cooling tank cooling system of the multipurpose storage cooling system according to the present invention, the storage cooling tank 100 transfers the cooling power of the refrigerant cooled by the AC refrigerator to the PCM through the heat exchanger of the storage cooling tank 100. . In the AC refrigerator, the high-temperature, high-pressure gas refrigerant compressed by the compressor 410 goes to the condenser 430 to be converted into a low-temperature, high-pressure liquid refrigerant, and becomes a low-temperature low pressure in the expansion valve 460. The liquid refrigerant forcibly passing through the expansion valve 460 that suddenly narrows, becomes easily evaporated while encountering a pipeline widening suddenly at the exit of the expansion valve 460, and cools the refrigerant while changing to a gas state while evaporating through an evaporator in the room. Let's do it.

The AC refrigerator is operated by using electricity in the late-night time zone where the electricity consumption is low, and the cold storage tank 100 is allowed to cool down to enable the use of the cold air required during the daytime period, so that the energy dissipation utilization efficiency is high. You can overcome blackouts. In addition, by separately installing the cold storage tank 100 outside the cooling device, there is no restriction over time by accumulating the PCM and transferring cold air to the cooling device as needed even during the daytime.

PCM utilizes the property of absorbing or releasing heat when a material undergoes a phase change, and it is advantageous that the heat quantity per unit mass is large. Water (latent heat: 67 to 80 kcal) or a hydrate of an organic or inorganic salt can be used as an example of the PCM, and a substance having a larger latent heat than water is preferable. In the present invention, one or a combination of products commercially available in the form of granules, powders, beads, etc., which are PCM materials having a phase change temperature of 0 ° C. to −46 ° C. or lower. Can be selected and used.

Brine is a cooling power transmission antifreeze having a low freezing point, and can use a low temperature fluid such as calcium chloride, chloride or sodium chloride, and a cryoprotectant such as ethylene glycol (EG) or propylene glycol (PG). In addition, the refrigerant | coolant can use R-404A which is a triple mixed refrigerant which mixed R-125, R-143a, and R-134a.

The multipurpose storage cooling system of the present invention includes a plurality of cooling devices having different cooling temperature ranges, but the equipment for accumulating the PCM and the PCM may be configured to a specification capable of efficiently cooling the cooling device having the lowest cooling temperature range. A flow rate capable of efficiently cooling the cooling device having the lowest cooling temperature range may be discharged from the storage cooling tank 100.

Figure 4 is a cross-sectional view showing a storage tank of the multi-purpose storage cooling system according to the present invention, the storage cooling tank 100 is a refrigerant conveyed by the brine tube 120 and the AC cooler circulated brine by a circulation pump therein Pipes 110 are alternately installed to exchange cold air.

The plurality of chillers includes a tubular heat exchanger. Finless tubular heat exchanger makes it simple to manufacture and can be used even when the pressure in the fluid is high.

The multipurpose refrigeration system further includes a check valve 340, as shown in FIG. The check valve 340 may be positioned in a brine tube 300 through which brine is discharged from the second cooling device 220, and may prevent reverse flow of brine flowing into the cold storage tank 100. That is, the brine prevents reverse flow by installing the check valve 340 in the brine pipe 300 flowing into the storage cooling tank 100 after cooling the second cooling device 220.

More specifically, the multi-purpose storage cooling system according to the present invention will be described with reference to FIGS. 5 to 7 as follows.

5 is a block diagram showing a multi-purpose refrigeration system using a brine flow rate distribution according to another embodiment of the present invention, the multi-purpose refrigeration system further includes at least one third cooling device (230). The third cooling device 230 is supplied with a cooling temperature range higher than that of the second cooling device 220 and a brine flow rate discharged from the second cooling device 220 is distributed. It may include. One brine tube 300 from which the brine is discharged from the second cooling device 220 is derived in plural so as to be connected to at least one third cooling device 230 and the cold storage tank 100, and the third cooling device 230 Connected to each of the brine discharged from the second cooling device 220 may be distributed to supply a portion of the flow rate.

In addition, the three-way valve 320 may further include. The three-way valve 320 may be positioned in the brine tube 300 through which brine is discharged from the second cooling device 220, and adjust the flow rate of brine supplied to the third cooling device 230. In other words. The brine discharged from the second cooling device 220 may be distributed to supply a required flow rate to the third cooling device 230. The brine flow rate that is not supplied to the third cooling device 230 may directly flow into the storage cooling tank 100.

The cooling temperature range of the third cooling device 230 is higher than that of the second cooling device 220, so that the cooling of the second cooling device 220 and the brine discharged may be sufficiently cooled. One or more third cooling devices 230 higher than the cooling temperature range of the second cooling device 220 may include a plurality of third cooling devices 230 having the same cooling temperature range, and different cooling temperature ranges. Third cooling apparatus 230 may be configured, respectively. When the plurality of third cooling devices 230 are included, the flow rate required by the plurality of third cooling devices 230 may not exceed the flow rate discharged from the second cooling device 220. That is, when the flow rate required for cooling the third cooling device 230 is 30% before / after the flow rate discharged from the second cooling device 220, the third cooling device 230 includes up to three.

6 is a view illustrating a brine flow rate distribution according to a cooling temperature range of a cooling apparatus according to another embodiment of the present invention, wherein the first cooling apparatus 210 is a refrigeration apparatus having a cooling temperature range of minus 20 degrees or less. The second cooling device 220 may be a refrigeration device of minus 5 degrees and 0 degrees, and the third cooling device may be a cooling device of 0 degrees to 5 degrees image.

In this case, 20 to 30% of the brine flow rate discharged from the first cooling device 210 is supplied to the second cooling device 220, and the second cooling device 220 is supplied to the third cooling device 230. 30 to 40% of the brine flow rate from) is supplied. That is, the temperature of the brine flowing from the cold storage tank 100 to the freezing heat exchanger 210 and discharged after freezing heat exchange is low enough to be supplied to the refrigerating device and reusable. About 20 to 30% of the total flow rate of brine discharged from the refrigerating device is divided into flow rates by the three-way valve 310 to the refrigerated heat exchanger 220 after the flow is distributed, and refrigerated heat exchange is performed. The degree of brine is introduced directly into the cold storage tank (100). In addition, the discharged brine temperature of the refrigerated heat exchange in the refrigerating unit is low enough to be reusable by supplying the cooling unit. About 30 to 40% of the brine discharged from the refrigerating device and 8 to 12% of the total brine flow rate are brine branched to the cooling heat exchanger 230 by the same operation method as described above, and the cooling heat exchange is completed in the cold storage tank 100. Inflow, the remaining about 60 to 70% of the brine flow rate of 15 to 20% of the brine flows directly into the cold storage tank (100).

Table 1 shows the brine flow rate distribution according to the movable chiller, and when the cooling of the second chiller 220 and the third chiller 230 is not necessary, the brine is blocked by blocking the three-way valves 310 and 320. All of the flow rate may be introduced directly to the cold storage tank (100).

In addition, when the cooling of the third cooling device 230 is not necessary, the total amount of brine flow rate is blocked by blocking the three-way valve 320 located in the brine tube 300 through which the brine is discharged from the second cooling device 220. It can be introduced directly into the storage tank. When the plurality of third cooling devices 230 are included, each of the cooling devices that do not require cooling may be blocked, and all of the plurality of third cooling devices 230 including the plurality of cooling devices may be blocked. When the brine supply is cut off to the third cooling apparatus 230, the brine may directly flow into the storage cooling tank 100 in the entire flow rate.

However, when the supply of the brine is blocked because the cooling of the second cooling device 220 is not necessary, the supply of the brine of the third cooling device 230 is also blocked and cannot be cooled. Therefore, when the first cooling device 210 is a refrigerating device, the second cooling device 220 is a refrigerating device, and the third cooling device is a cooling device, as shown in FIG. 6, only the refrigerating device is operated or the freezing / refrigerating device is It is possible to operate the refrigeration / refrigeration / cooling unit, or to distribute the brine flow rate. In addition, when the supply of the brine of the cooling device is blocked, the blow fan 240 may also be stopped.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

100: cold storage tank 110: refrigerant pipe
120: brine tube 200: chiller
210: first cooling device 220: second cooling device
230: third cooling device 240: blow fan
300: brine tube 310, 320: three-way valve
330: brine pump 340: check valve
410: compressor 430: condenser
460: expansion valve

Claims (7)

A cold storage system that delivers the cooling power of the refrigerant cooled by the AC refrigerator to the PCM (phase-change material) through the heat exchanger of the cold storage tank, and distributes and supplies the cold air of the cold storage tank to a plurality of cooling devices having different cooling temperature ranges through brine. To
A first cooling device supplied with the entire amount of brine flow rate supplied from the cold storage tank;
At least one second cooling device in which a part of the brine flow rate discharged from the first cooling device is distributed and supplied;
The cooling temperature zone of the second cooling device is higher than the cooling temperature zone of the first cooling device. The method of claim 1,
And a three-way valve installed in the brine pipe from which the brine is discharged from the first cooling device to adjust the flow rate of brine supplied to the second cooling device, and the second cooling of the brine discharged from the first cooling device. The brine is not supplied to the device is a multi-purpose refrigeration system using the brine flow distribution, characterized in that the flow directly into the cold storage tank. 3. The method of claim 2,
When the cooling of the second cooling device is not necessary, the multi-purpose storage cooling system using the brine flow rate distribution, characterized in that the entire amount of the brine flow rate discharged from the first cooling device flows directly into the storage tank by adjusting the three-way valve. 3. The method of claim 2,
A temperature measuring unit located inside the storage tank and measuring a temperature of the PCM;
3 to increase the flow rate of brine supplied to the second cooling device when the temperature of the PCM measured from the temperature measuring unit is higher than the set temperature; and to decrease the flow rate of brine supplied to the second cooling device when the temperature of the PCM is higher than the set temperature. Multi-purpose storage cooling system using the brine flow distribution, characterized in that it further comprises a control unit for adjusting the opening and closing of the directional valve. The method of claim 1,
The storage cooling tank is a multi-purpose storage cooling system using a brine flow distribution, characterized in that the brine is circulated by the circulation pump inside the refrigerant pump and the refrigerant pipe to which the refrigerant is transferred by the AC cooler are alternately installed. The method of claim 1,
And a check valve positioned in a brine tube through which brine is discharged from the second cooling device and preventing a reverse flow of brine introduced into the storage tank. The method of claim 1,
And at least one third cooling device having a brine flow rate discharged from the second cooling device being distributed and being supplied and having a cooling temperature range higher than that of the second cooling device.

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