KR20230005577A - Large temperature difference chiller - Google Patents

Abstract

A large temperature difference freezer according to the present invention comprises: a low-pressure cooling unit including a first compressor and a first expansion valve; a high-temperature cooling unit including a second compressor and a second expansion valve; a first heat exchanging unit discharging a coolant with the temperature having been increased by the heat exchange between the coolant of a low temperature and a circulating medium which circulates the low-pressure cooling unit and the high-pressure cooling unit; a second heat exchange unit discharging cold water of a low temperature after the heat exchange between the cold water with the temperature having been increased at the load side and the circulating medium which circulates the high-pressure cooling unit and the low-pressure cooling unit; a coolant flow path circulating the first heat exchange unit such that the coolant may sequentially exchange heat with the low-pressure cooling unit and the high-pressure cooling unit; and a cold water flow path in which the cold water circulates the second heat exchange unit so as to sequentially exchange heat with the high-pressure cooling unit and the low-pressure cooling unit. The first and second heat exchange units comprise: a water chamber which is provided with first and second heat exchange spaces divided such that the circulating medium circulating the low-pressure cooling unit and the high-pressure cooling unit may individually penetrate therethrough; a heat pipe unit which is connected to the coolant flow path or the cold water flow path, and is formed at the first and second heat exchange spaces; and a connecting water chamber cover which allows a first heat pipe unit arranged at the first heat exchange space and a second heat pipe unit formed at the second heat exchange space to communicate with each other. Therefore, the coolant or the cold water continuously exchanges heat with the circulating medium circulating the low-pressure cooling unit and the high-pressure cooling unit, to provide improved energy efficiency, and ultimately extend the service life of the product.

Description

Large temperature difference chiller {Large temperature difference chiller}

The present invention relates to a refrigerator, and more particularly, to a large temperature difference refrigerator that improves energy efficiency by increasing the temperature difference between the inlet and outlet of cold water and cooling water.

A cooling system is commonly used for constant temperature and humidity and cooling of the room. At this time, the general cooling system is installed at a location where indoor temperature and humidity control is required, and the cooling tower and the cooling tower are mainly installed outdoors and exchange heat with the cooling water using the atmosphere, and the load side that cools through the heat exchange between the cold water and the indoor air. and a chiller installed between the load side to cool the cold water heated through heat exchange between the cooling water and the cold water, transmit it to the load side, and send the heated cooling water to the cooling tower.

Here, cooling water cooled in the cooling tower is supplied to the refrigerator through a cooling water supply line, and cooling water warmed through heat exchange with cold water in the refrigerator is returned to the cooling tower through a cooling water recovery line.

In addition, the cold water warmed by heat exchange with indoor air at the load side is returned to the refrigerator through the cold water recovery line, and the cold water cooled by heat exchange with the cooling water in the refrigerator is sent to the load side through the cold water supply line.

At this time, the purpose of the large temperature difference chiller is to increase the temperature difference between the inlet and outlet of the cold water and the cooling water to reduce the circulation amount of the cold water and the cooling water. However, such a large temperature difference chiller has a problem in that the performance coefficient of the chiller is greatly lowered as the compression ratio of the chiller increases in order to increase the temperature difference between the chilled water and the cooling water.

As a result, power consumption of the large-temperature difference chiller is greatly increased to decrease energy efficiency, and when a plurality of chillers are used to offset this, control is difficult and the installation area is greatly increased.

An embodiment of the present invention has been made to solve the above problems, and discloses a new structure for continuously exchanging heat between a heat exchange medium and cooling water or cold water circulating between a low pressure cooling unit and a high pressure cooling unit, thereby providing a simpler large temperature differential refrigerator. intended to provide

A large temperature difference refrigerator according to an embodiment of the present invention includes a low pressure cooling unit having a first compressor and a first expansion valve; a high-pressure cooling unit having a second compressor and a second expansion valve; a first heat exchange unit for exchanging heat between the low-temperature cooling water and the circulating medium circulating between the low-pressure cooling unit and the high-pressure cooling unit to discharge elevated cooling water; a second heat exchange unit for discharging low-temperature cold water by exchanging heat between the cold water heated from the load side and the circulating medium circulating between the low-pressure cooling unit and the high-pressure cooling unit; a cooling water passage through which the cooling water is circulated through the first heat exchange unit to sequentially exchange heat with the low-pressure cooling unit and the high-pressure cooling unit; and a cold water passage through which cold water circulates through the second heat exchange part so that the cold water sequentially exchanges heat with the high-pressure cooling part and the low-pressure cooling part, wherein the first and second heat exchange parts circulate the low-pressure cooling part and the high-pressure cooling part. A water chamber in which first and second heat exchange spaces are partitioned so that medium passes therethrough, a heat exchanger pipe part connected to the cooling water flow path or the cold water flow path and formed in the first and second heat exchange spaces, and a water chamber disposed in the first heat exchange space It is formed as a connecting water chamber cover that communicates the first heat exchanger tube and the second heat transfer tube formed in the second heat exchange space, so that cooling water or cold water continuously exchanges heat with a circulating medium circulating the low pressure cooling unit and the high pressure cooling unit. do.

At this time, in the large temperature difference refrigerator of the first embodiment, the water chamber is partitioned parallel to the heat exchanger tube unit so that the first and second heat exchange spaces can be formed parallel to the heat transfer tube unit, and the connection water chamber cover is connected to the first heat exchanger tube unit. It may be formed as a first connection space connected, a second connection space connected to the second heat transfer tube unit, and a communication space communicating the first and second connection spaces through a communication hole.

In addition, the first and second heat exchange units may have the connection water chamber cover formed on one side of the water chamber, and a water chamber cover connecting the first heat exchanger tube units or connecting the second heat transfer tube units to the other side. .

At this time, in the large temperature difference refrigerator of the second embodiment, the connecting water chamber cover is formed between the water chambers, the first communication space communicating the first heat transfer tube part and the first heat transfer tube part, and the first heat transfer tube part and the second heat transfer pipe It may be formed of a second communication space for communicating parts and a third communication space for connecting the second heat transfer pipe part and the second heat transfer pipe part.

In addition, the connection water chamber cover may be formed between the first connection space and the second connection space in the first and second heat exchange units, and the first heat transfer tube unit and the first heat exchanger tube unit or the first heat transfer tube unit may be formed on both sides of the water chamber. A water chamber cover formed of a fourth communication space communicating the second heat exchanger tube portion and the second heat exchanger tube portion and a fifth communication space communicating the first heat transfer pipe portion or the second heat transfer tube portion and the cooling water passage or the cold water passage is formed. can

Preferably, the first compressor and the second compressor have the same compression ratio, and the low-pressure cooling unit and the high-pressure cooling unit preferably have the same capacity ratio.

As described above, according to the problem solving means of the present invention, various effects including the following can be expected. However, the present invention is not established when all of the following effects are exerted.

The large temperature difference refrigerator of the present invention has a low-pressure cooling unit and a high-pressure cooling unit having independent refrigerating cycles, so that lower chilled water can be obtained, and thus the utilization is very high.

In addition, the low-temperature chilled water is produced so that the low-pressure cooling part and the high-pressure cooling part continuously exchange heat, and at the same time, the amount of cooling water and chilled water required for the same cooling load is reduced to reduce the transportation power by more than 50%. As a result, the performance coefficient of the refrigerator is increased, and the installation space is reduced by realizing miniaturization.

In addition, the cooling water flow path and the cold water flow path are formed to be able to sequentially exchange heat with the low-pressure cooling unit and the high-pressure cooling water, thereby simplifying the large temperature difference chiller, reducing initial installation costs and significantly reducing maintenance costs.

In addition, the connection water chamber cover forms a communication space that communicates the first and second heat transfer pipes when cooling water or cold water is circulated, thereby maintaining a constant circulation speed of cooling water and cold water to maintain heat exchange efficiency above a certain level, thereby maximizing the effect of improving energy efficiency. .

In addition, by forming the first and second compressors to have the same compression ratio, surging can be minimized, which can minimize disadvantages such as vibration and noise during operation of the refrigerator, and ultimately, the effect of extending the life of the product can be expected. can

In addition, by forming the low-pressure cooling unit and the high-pressure cooling unit to have the same capacity ratio, it is possible to more easily control the partial load of the low-pressure cooling unit or the high-pressure cooling unit at a load of 50% or less. A more environmentally friendly refrigerator can be provided by operating only one of the units to provide desired cooling.

In addition, since the load up to 50% corresponds to 60% of the total load ratio according to the integrated performance coefficient, it is possible to respond to some extent even when either the low-pressure cooling part or the high-pressure cooling part is not in operation, improving user convenience. let it

1 is a schematic diagram of a large temperature difference refrigerator according to a first embodiment of the present invention.
2 is a view showing one side of the first and second heat exchangers of FIG. 1;
3 is a view showing another side of the first and second heat exchangers of FIG. 1;
Figure 4 is a cross-sectional view in the direction D of Figure 3;
5 is a cross-sectional view in the direction E of FIG. 2;
6 is a view sequentially illustrating cross-sections in directions A, B, and C of FIG. 2;
7 is a schematic diagram of a large temperature difference refrigerator according to a second embodiment of the present invention.
8 is a cross-sectional view of the first and second heat exchangers of FIG. 7;
9 is a view sequentially illustrating cross sections in directions D, E, and FG of FIG. 8;

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, descriptions of well-known functions or configurations are omitted in order not to obscure the gist of the present invention.

In addition, the large temperature difference refrigerator of the first embodiment will be described first, and in order to avoid overlapping description, the common parts of the first and second embodiments will be described in the first embodiment, and will be omitted later in the second embodiment. For convenience, the common parts of the first and second embodiments are described using the same symbols, and '2' is added at the beginning of the codes of the first embodiment when the parts with differences have the same function.

1 is a schematic diagram of a large temperature differential refrigerator according to a first embodiment of the present invention, FIG. 2 is a side view of first and second heat exchangers of FIG. 1, and FIG. 3 is a view of the first and second heat exchangers of FIG. 4 is a cross-sectional view in the direction D of FIG. 3, FIG. 5 is a cross-sectional view in the direction E of FIG. 3, and FIG. 6 is a cross-sectional view in the direction A, B, and C of FIG. It is an illustrated drawing. 7 is a schematic diagram of a large temperature differential refrigerator according to a second embodiment of the present invention, FIG. 8 is a cross-sectional view of first and second heat exchangers of FIG. 7, and FIG. 9 is a view in the D, E, F and G directions of FIG. It is a drawing showing the cross section sequentially.

1 to 9, the large temperature difference refrigerator 10 of the present invention includes a first compressor 110, a low pressure cooling unit L, 100 having a first expansion valve 120, and a second compressor 210 ), a high-pressure cooling unit (H, 200) having a second expansion valve 220, low-temperature cooling water, and a circulating medium that circulates the low-pressure cooling unit (L, 100) and the high-pressure cooling unit (H, 200). The first heat exchange unit 300 discharges the increased temperature by exchanging heat with the cold water heated from the load side 30 and the circulating medium that circulates the low pressure cooling unit L100 and the high pressure cooling unit H200. The second heat exchange unit 300 discharges low-temperature cooling water by exchanging heat with the first heat exchange unit 300 so that the cooling water sequentially exchanges heat with the low-pressure cooling unit L100 and the high-pressure cooling unit H200. ) and the cold water passage circulating through the second heat exchange part 300 so that the cold water is sequentially heat-exchanged with the high-pressure cooling part (H, 200) and the low-pressure cooling part (L, 100) ( 600), wherein the first and second heat exchange units 300 are partitioned so that the circulating medium circulating through the low-pressure cooling unit (L, 100) and the high-pressure cooling unit (H, 200) passes through, respectively. The water chamber 310 in which the second heat exchange spaces 3111 and 3112 are formed, and the cooling water flow path 500 or the cold water flow path 600 are connected and formed in the first and second heat exchange spaces 3111 and 3112. 320) and the connection water chamber cover 330 communicating the first heat exchanger pipe part 321 disposed in the first heat exchange space 3111 and the second heat exchanger pipe part 322 formed in the second heat exchange space 3112. formed, characterized in that the cooling water or cold water is continuously heat-exchanged with the circulating medium circulating through the low-pressure cooling part (L, 100) and the high-pressure cooling part (H, 200).

The large temperature difference chiller 10 is a chiller that can reduce the power required for the required cooling load by reducing the amount of air flow of the cooling tower 40 or the amount of circulating medium by making the temperature difference generated by the inflow and outflow of cold water or cooling water larger than the standard. .

Specifically, in the case of a refrigerator, there is a general difference between the temperature of the cold water flowing into the refrigerator and the temperature of the cold water flowing out of the refrigerator by about 5 ℃, but the large temperature difference refrigerator 10 of the present invention In order to provide the necessary cooling load to the load side 30 by making the difference between the temperature of the incoming cold water and the temperature of the cold water flowing out of the second heat exchange unit 300 by about 10 ° C, a smaller amount of cold water than a typical refrigerator is required. do.

At this time, since a large amount of power is required to increase the temperature difference of cold water, the large temperature difference refrigerator 10 of the present invention includes a low-pressure cooling unit (L, 100) and a high-pressure cooling unit (H, 200) in which a circulating medium independently circulates. It has the effect of increasing energy efficiency by reducing the required power.

Therefore, in the low-pressure cooling unit (L, 100), the first compressor 110, the first expander 120, and the circulating medium supply the first compressor 110, the first and second heat exchange units, and the first compressor 110. It is formed of a first circulation passage 130 formed to circulate sequentially, and the high-pressure cooling part H 200 includes a second compressor 210, a second expander 220, and a circulating medium in the second compressor 210. , the first and second heat exchange units 300 and the second compressor 210 are formed of a second circulation passage 230 formed to sequentially circulate.

In summary, the large temperature difference refrigerator 10 of the present invention increases the temperature difference between the cold water supplied to the load side 30 and the cold water recovered from the load side 30 to reduce the amount of cold water used, and the low pressure cooling unit (L, 100) and a high-pressure cooling unit (H, 200) are provided to provide cooling using less power through multi-stage cooling.

Here, the low-pressure cooling unit (L, 100) and the high-pressure cooling unit (H, 200) are set to have the same compression ratio and operated while installed in the flow path through a pump or blower. (surging) phenomenon is prevented.

Specifically, since the area in which surging occurs varies according to the compression ratio of the compressor, when the compression ratios of the first compressor 110 and the second compressor 210 are different, the area in which surging occurs varies. Since the possibility is increased, it is preferable that the compression ratios of the first and second compressors 110 and 210 are the same.

In addition, when the capacity ratio of the low-pressure cooling unit (L, 100) and the high-pressure cooling unit (H, 200) is set to be the same, and the required cooling load is 50% or less of the total cooling load of the large temperature difference refrigerator (10), the low-pressure cooling unit (L , 100) and the high-pressure cooling unit (H, 200) are preferably operated to facilitate partial load control.

When the capacity ratios of the low-pressure cooling unit (L, 100) and the high-pressure cooling unit (H, 200) are different, in case of partial load control, depending on the cooling load required, between the low-pressure cooling unit (L, 100) and the high-pressure cooling unit (H, 200) This is because it is difficult to control because the point at which one is operated must be changed.

In other words, the large temperature difference chiller 10 of the present invention includes a low-pressure cooling unit L, 100 and a high-pressure cooling unit H, 200 so that cold water continuously exchanges heat with a circulating medium to produce cold water at a lower temperature. It is provided to the load side 30, and at this time, the compression ratio and capacity ratio of the low-pressure cooling unit (L, 100) and the high-pressure cooling unit (H, 200) are the same to minimize the surging phenomenon and facilitate partial load control. It has the effect of improving the durability and convenience of the product.

The first heat exchange unit 300 includes the first heat exchange unit 300 for exchanging heat between the low-temperature cooling water introduced from the cooling tower 40 and the circulating medium to discharge the elevated cooling water, and the elevated cold water flowing in from the load side 30. It is formed of the second heat exchange unit 300 that heat-exchanges the circulating medium to discharge low-temperature cold water, so as to heat-exchange the cooling water or cold water with the circulating medium circulating between the low-pressure cooling unit L100 and the high-pressure cooling unit H200. Ultimately, the cold water is discharged to the load side 30 at a lower temperature.

Here, the first heat exchange unit 300 is a place where the circulating medium and the cooling water are heat exchanged and corresponds to a condenser, and the second heat exchange unit 300 is a place where the circulating medium and the cold water are heat exchanged and corresponds to an evaporator.

However, since the first and second heat exchange units 300 have the same structure so that the circulating medium and the cooling water or cold water can continuously exchange heat, each structure will be described through the first heat exchange unit 300 to avoid redundant description, The second heat exchange unit 300 will be described only for differences.

The first heat exchange unit 300 of the first embodiment includes a water chamber 310 in which a circulating medium and cooling water are heat-exchanged, a heat exchanger tube 320 installed inside the water chamber 310 and passing cooling water, and first and second heat exchange spaces. A tube sheet for fixing the connecting water chamber cover 330 connecting 3111 and 3112, the water chamber cover 340 connecting the heat transfer tube unit 320, and the plurality of heat transfer tubes forming the heat transfer tube unit 320 at regular intervals. (350).

In the water chamber 310, a partition wall 311 is formed in the direction in which the heat transfer tube unit 320 extends, and the first heat exchange space 3111 in which the cooling water and the circulating medium circulating in the low-pressure cooling unit L 100 exchange heat with each other is used for high-pressure cooling. It is partitioned into a second heat exchange space 3112 in which the circulating medium and cooling water circulating in the unit H 200 exchange heat, the first heat exchange space 3111 is connected to the first circulation passage 130, and the second heat exchange space 3112 is connected to the second circulation passage 230 to exchange heat with the cooling water, respectively.

The heat transfer tube unit 320 is formed of a first heat transfer tube unit 321 disposed in the first heat exchange space 3111 and a second heat transfer tube unit 322 disposed in the second heat exchange space 3112, so that the cooling water is a low pressure cooling unit ( L, 100) and the high-pressure cooling unit (H, 200) to sequentially exchange heat.

The connection water chamber cover 330 is coupled to one side of the water chamber 310, and the first connection space 331 connected to the first heat exchanger tube part 321 and the second connection space 331 connected to the second heat exchanger tube part 322 The communication space 333, which communicates the first connection space 331 and the second connection space 332 through the space 332 and the communication hole 3331, and the first and second connection spaces 331 and 332 in the vertical direction. It is formed of a partition wall 334 separating the cooling water from the first heat exchanger tube unit 321 to the second heat transfer tube unit 322 so that heat is exchanged.

Specifically, the first connection space 331 and the second connection space 332 are separated in the vertical direction by the partition wall 334 formed in the middle, and accordingly, the plurality of The heat transfer pipes are installed to be uniformly distributed in the partitioned first and second connection spaces 331 and 332.

At this time, the communication hole 3331 is formed on the upper side of the first connection space 331 divided in the vertical direction and the lower side of the second connection space 332 divided in the vertical direction, so that the first connection is made through the communication space 333. The upper side of the space 331 and the lower side of the second connection space 332 communicate with each other.

In addition, the cooling water supply passage 510 is connected to the lower side of the first connection space 331 divided in the vertical direction, and the cooling water discharge passage 520 is connected to the upper side of the second connection space 332 divided in the vertical direction. .

Accordingly, the cooling water is introduced to the lower side of the first connection space 331 through the cooling water supply passage 510, and the water chamber cover 340 passes through the heat transfer pipe installed below the first connection space 331 among the first heat transfer pipe parts 321. ), flows into the upper side of the first connection space 331 through the water chamber cover 340 through the heat transfer pipe installed on the upper side of the first connection space 331, and flows into the upper side of the first connection space 331. The cooled water is moved to the communication space 333 through the communication hole 3331 and moves to the lower side of the second connection space 332 through the communication hole 3331 on the opposite side.

The coolant moved to the lower side of the second connection space 332 is moved to the water chamber cover 340 through the heat transfer pipe installed on the lower side of the second connection space 332 among the second heat transfer tubes 322, and the water chamber cover 340 The coolant flows into the upper side of the second connection space 332 through the heat transfer pipe installed on the upper side of the second connection space 332 and is discharged to the cooling water discharge passage 520.

Therefore, the cooling water is double heat-exchanged with the circulating medium circulating in the low-pressure cooling unit (L, 100) through the first heat transfer tube unit 321, and also with the circulating medium circulating in the high-pressure cooling unit (H, 200) through the second heat transfer tube. Heat is exchanged twice through the unit 322 to provide more improved heat exchange efficiency.

At this time, the communication space 333 prevents the cooling water moving through the first heat transfer tube unit 321 from directly flowing into the second heat transfer tube unit 322, thereby reducing the pressure difference and By primarily offsetting the temperature difference, more stable and uniform cooling water is provided, resulting in improved cooling efficiency.

The water chamber cover 340 is coupled to the other side of the water chamber 310 and is partitioned to connect between the plurality of heat exchanger tubes constituting the first heat exchanger tube portion 321 and the plurality of heat exchanger tubes constituting the second heat exchanger tube portion 322. so that the circulating cooling water is evenly distributed among the plurality of heat transfer pipes to efficiently exchange heat with the circulating medium.

At this time, between the water chamber 310 and the water chamber cover 340 and between the water chamber 310 and the connected water chamber cover 330, the plurality of heat exchangers constituting the first and second heat exchanger tubes 320 can be arranged at regular intervals. The tube sheet 350 is formed to facilitate assembly of the first heat exchange unit 300, and since cooling water can be supplied to each heat exchanger tube at the same pressure, heat exchange efficiency is improved.

In other words, the first heat exchange unit 300 includes a connecting water chamber cover 330 connected to the cooling water passage 500 through which cooling water circulates, a tube sheet 350, a water chamber 310, a tube sheet 350, and a water chamber cover ( 340) is formed by sequentially combining, and at this time, the tube sheet 350 is formed with a heat transfer tube portion 320 penetrating the water chamber 310, so that the cooling water is formed in the low-pressure cooling portion (L, 100) and the high-pressure cooling portion (H, 200). ) and sequential heat exchange.

Specifically, looking at the flow of the cooling water and the circulating medium, the cooling water flows through the cooling water supply passage 510, the lower side of the first connection space 331, the first heat transfer tube unit 321, the water chamber cover 340, and the first heat transfer tube unit 321. ), the upper side of the first connection space 331, the communication space 333, the lower side of the second connection space 332, the second heat transfer pipe part 322, the water chamber cover 340, the second heat transfer pipe part 322, The circulating medium sequentially moves through the upper side of the second connection space 332 and the cooling water discharge passage 520 and circulates through the low-pressure cooling unit L 100 through the first circulation passage 130 in the first heat exchange space ( 3111) and circulates in the high-pressure cooling unit (H, 200), the circulating medium passes through the second heat exchange space 3112 through the second circulation passage 230 and undergoes double heat exchange with the cooling water.

The second heat exchange unit 300 has the same structure as the first heat exchange unit 300, but the heated cold water introduced from the load side 30 is connected to the high-pressure cooling unit H200 and the low-pressure cooling unit L100. To enable sequential heat exchange, the cold water supply passage 610, the lower side of the first connection space 331, the first heat transfer tube unit 321, the water chamber cover 340, the first heat transfer tube unit 321, and the first connection space Upper side of 331, communication space 333, lower side of second connection space 332, second heat transfer pipe part 322, water chamber cover 340, second heat transfer pipe part 322, second connection space 332 ) and the cold water discharge passage 620 are sequentially moved.

Therefore, the large temperature difference refrigerator 10 of the present invention includes a low-pressure cooling unit L, 100 and a high-pressure cooling unit H, 200 to perform double heat exchange between the cooling water and the chilled water to reduce the temperature of the cold water discharged to the load side 30. The first and second heat exchange units 300 simultaneously connected to the low pressure cooling unit (L, 100) and the high pressure cooling unit (H, 200) improve energy efficiency by reducing the amount of cold water and reducing required power. A more simplified large temperature difference refrigerator 10 is provided by minimizing the required configuration when installing the large temperature difference refrigerator 10 and reducing the distance in which cooling water and cold water circulate.

Accordingly, the present invention ultimately reduces the installation space and installation cost of the large temperature difference refrigerator 10, and furthermore, it also has an effect of facilitating maintenance and significantly improving user convenience.

In addition, in the case of forming the first and second heat exchange spaces 3111 and 3112 by partitioning the water chamber 310 parallel to the heat transfer tube unit 320 as in the first embodiment, the size of the first and second heat exchange units 300 can be reduced. It has the effect of realizing the miniaturization of the large temperature difference refrigerator 10 because it can be minimized and the length of the passage required therefor can also be reduced.

The cooling water passage 500 includes a cooling water supply passage 510 through which cooling water is supplied to the first heat exchange section 300 and a first heat exchange section ( 300) is formed as a cooling water discharge passage 520 through which cooling water is discharged to the cooling tower 40.

The cold water passage 600 includes a cold water supply passage 610 through which cold water is supplied to the second heat exchange section 300 and a second heat exchange section ( 300) is formed as a cold water discharge passage 620 through which cold water is discharged to the load side 30.

At this time, in the large temperature difference refrigerator 10 of the present invention, the cooling water passage 500 and the first heat exchange part 300 are connected, and the cold water passage 600 and the second heat exchange part 300 are connected, so that the cooling water or the cold water has a low pressure. Both the cooling unit (L, 100) and the high-pressure cooling unit (H, 200) are circulated to perform double heat exchange, thereby minimizing the length of the flow path to reduce initial installation and maintenance costs.

Since the first and second heat exchange units 2300 of the second embodiment also have the same structure, each structure will be described through the first heat exchange unit 2300 in order to avoid redundant description, and the second heat exchange unit 2300 will be different depending on the difference. Let me explain only.

The first heat exchange unit 2300 of the second embodiment includes a water chamber 2310 in which the circulating medium and the cooling water exchange heat, a heat exchanger tube 2320 installed inside the water chamber 2310 and passing the cooling water, and first and second heat exchange spaces. A tube sheet for fixing the connecting water chamber cover 2330 communicating 23111 and 23112, the water chamber cover 2340 connected to the cooling water passage 500, and the plurality of heat transfer tubes forming the heat transfer tube unit 2320 at regular intervals ( 2350) is formed.

At this time, the connection water chamber cover 2330 is formed between the water chamber 2310 and circulates the first heat exchange space 23111 passing through the circulating medium circulating in the low-pressure cooling unit (L, 100) and the high-pressure cooling unit (H, 200). The second heat exchange space 23112 through which the circulating medium passes is formed by being divided in a direction crossing the heat transfer tube unit 2320.

Therefore, in the first heat exchange unit 2300 of the second embodiment, unlike the first heat exchange unit 300 of the first embodiment, the first and second heat exchange spaces 23111 and 23112 are partitioned and separated by the connection water chamber cover 2330. The heat exchange between the circulating medium circulating in the low-pressure cooling unit (L, 100) and the circulating medium circulating in the high-pressure cooling unit (H, 200) is blocked to increase the heat exchange efficiency between the cooling water and the circulating medium. have an enhancing effect.

The heat transfer tube unit 2320 is formed of a first heat transfer tube unit 2321 disposed in the first heat exchange space 23111 and a second heat transfer tube unit 2322 disposed in the second heat exchange unit 2300 space, so that the cooling water is a low-pressure cooling unit. (L, 100) and the high-pressure cooling unit (H, 200) to sequentially exchange heat.

The connecting water chamber cover 2330 is formed between the water chambers 2310 to divide the first and second heat exchange spaces 23111 and 23112, and to communicate the first and second heat exchanger tubes 2321 with each other. The first communication space 2333, the second communication space 2334 that communicates between the first heat transfer tube portion 2321 and the second heat transfer tube portion 2322, and the second heat transfer tube portion 2322 and the second heat transfer tube portion 2322 ) is formed as a third communication space 2335 communicating between them, so that the cooling water is repeatedly heat-exchanged with the circulating medium in the first and second heat exchange spaces 23111 and 23112, and at the same time, the first heat exchange space 23111 and the second heat exchange space 23112 is sequentially circulated and heat exchanged to increase the heat exchange efficiency improvement effect between the circulating medium and the cooling water.

At this time, the connection water chamber cover 2330 is partitioned and formed so that the second communication space 2334 can be formed evenly, even when a surging phenomenon occurs due to the partitioned and formed second communication space 2334. While partially canceling vibration, etc., cooling water is supplied to each heat pipe at the same pressure so that cooling water is stably circulated to provide more stable cooling and maximize the effect of improving heat exchange efficiency.

The water chamber cover 2340 is installed on both sides of the water chamber 2310, and includes a fourth communication space 2341 communicating with the cooling water flow path 500 and a fifth communication space 2342 communicating with the heat transfer tube unit 2320. formed to provide a flow path so that the cooling water continuously circulates through the plurality of heat transfer pipe units 2320.

In other words, the first heat exchange unit 2300 includes a water chamber cover 2340 connected to the cooling water supply passage 510, a tube sheet 2350, a water chamber 2310, a tube sheet 2350, a connecting water chamber cover 2330, and a tube. A seat 2350, a water chamber 2310, a tube sheet 2350, and a water chamber cover 2340 connected to the cooling water discharge passage 520 are formed by sequentially combining each water chamber 2310 in the tube sheet 2350. A heat transfer pipe portion 2320 passing through is formed so that the cooling water sequentially exchanges heat with the low-pressure cooling portion L100 and the high-pressure cooling water.

Specifically, looking at the flow of the cooling water and the circulating medium, the cooling water flows through the cooling water supply passage 510, the fourth communication space 2341, the first heat transfer pipe part 2321, the second communication space 2334, and the first heat transfer pipe part 2321. ), the fifth communication space 2342, the first heat transfer pipe part 2321, the second communication space 2334, the second heat transfer pipe part 2322, the fifth communication space 2342, the second heat transfer pipe part 2322, The circulating medium that sequentially moves through the third communication space 2335, the second heat transfer pipe part 2322, the fourth communication space 2341, and the cooling water discharge passage 520 and circulates through the low pressure cooling part L100 is The circulating medium passing through the first heat exchange space 23111 through the first circulation passage 130 and circulating in the high-pressure cooling unit H 200 enters the second heat exchange space 3112 through the second circulation passage 230. It passes through and exchanges double heat with the cooling water.

The second heat exchange unit 2300 has the same structure as the first heat exchange unit 2300, but the heated cold water introduced from the load side 30 is connected to the high-pressure cooling unit H200 and the low-pressure cooling unit L100. To sequentially exchange heat, the cold water supply passage 610, the fourth communication space 2341, the second heat transfer tube part 2322, the second communication space 2334, the second heat transfer tube part 2322, and the fifth communication space (2342), second heat transfer pipe part (2322), second communication space (2334), first heat transfer pipe part (2321), fifth communication space (2342), first heat transfer pipe part (2321), third communication space (2335) ), the first heat transfer tube unit 2321, the fourth communication space 2341, and the cold water discharge passage 620, the cold water is sequentially moved.

Therefore, the first and second heat exchange units 2300 according to the second embodiment of the present invention are formed by being separated by the connecting water chamber cover 2330 so that cooling water or cold water repeatedly passes through the first and second heat exchanger tube units 2321 and 2322. At the same time, by continuously moving the first heat transfer tube 2321 and the second heat transfer tube 2322, the efficiency of heat exchange between the circulating medium and cooling water or cold water is remarkably improved.

Accordingly, the large temperature difference chiller 10 of the present invention can ultimately minimize the required power when providing the same refrigerating load, and prevent heat exchange between the circulating medium to sufficiently secure the heat exchange time between the circulating medium and the cooling water or the cold water, ultimately Provides more improved durability and efficiency of the large temperature difference refrigerator (10).

Although preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited only to these specific embodiments, and can be appropriately changed within the scope described in the claims.

10,20 large temperature difference freezer
30 load side 40 cooling tower
100 Low pressure cooling unit (L) 110 1st compressor
120 first expander 130 first circulation passage
200 High pressure cooling unit (H) 210 2nd compressor
220 second expansion valve 230 second circulation passage
300,2300 1st, 2nd heat exchange part 310,2310 water chamber
311 bulkhead 3111, 23111 first heat exchange space
3112,23112 2nd heat exchange space
320,2320 Heat transfer tube part 321,2321 1st heat transfer tube part
322,2322 2nd heat pipe part
330,2330 Connecting room cover 331 1st connecting space
332 2nd connection space 333 communication space
3331 through hole 334 dividing wall
2333 1st communication space 2334 2nd communication space
2335 third communication space
340,2340 water chamber cover 2341 4th communication space
2342 5th communication space
350,2350 tubesheet
500 Cooling water passage 510 Cooling water supply passage
520 cooling water discharge path
600 cold water passage 610 cold water supply passage
620 cold water discharge path

Claims (7)

a low-pressure cooling unit having a first compressor and a first expansion valve;
a high-pressure cooling unit having a second compressor and a second expansion valve;
a first heat exchange unit for exchanging heat between the low-temperature cooling water and the circulating medium circulating between the low-pressure cooling unit and the high-pressure cooling unit to discharge elevated cooling water;
a second heat exchange unit for discharging low-temperature cold water by exchanging heat between the cold water heated from the load side and the circulating medium circulating between the low-pressure cooling unit and the high-pressure cooling unit;
a cooling water passage through which the cooling water is circulated through the first heat exchange unit to sequentially exchange heat with the low-pressure cooling unit and the high-pressure cooling unit; and
A cold water flow path circulating through the second heat exchange unit so that the cold water is sequentially heat-exchanged with the high-pressure cooling unit and the low-pressure cooling unit;
The first and second heat exchange units
A water chamber having first and second heat exchange spaces partitioned so that the low-pressure cooling unit and the circulating medium circulating in the high-pressure cooling unit pass through, respectively, and a heat transfer pipe connected to the cooling water flow path or the cold water flow path and formed in the first and second heat exchange spaces. and a connecting water chamber cover that communicates the first heat exchanger tube disposed in the first heat exchange space with the second heat exchanger tube formed in the second heat exchange space, so that cooling water or cold water circulates through the low-pressure cooling unit and the high-pressure cooling unit. A large temperature difference refrigerator, characterized in that the heat is continuously exchanged with the circulating medium.
According to claim 1,
The number room
It is partitioned parallel to the heat exchanger tube unit so that the first and second heat exchange spaces are formed parallel to the heat transfer tube unit,
The connection water chamber cover
Characterized in that it is formed of a first connection space connected to the first heat transfer pipe part, a second connection space connected to the second heat transfer pipe part, and a communication space communicating the first and second connection spaces through a communication hole. large temperature difference freezer.
According to claim 2,
The first and second heat exchange units
The connection water chamber cover is formed on one side of the water chamber, and a water chamber cover connecting the first heat transfer tube parts or connecting the second heat transfer tube parts is formed on the other side.
According to claim 1,
The connection water chamber cover
A first communication space formed between the water chambers and communicating the first heat transfer tube portion with the first heat transfer tube portion; a second communication space communicating the first heat transfer tube portion and the second heat exchanger tube portion; and the second heat transfer tube portion. and a third communication space connecting the second heat exchanger tube.
According to claim 4,
The first and second heat exchange units
The connection water chamber cover is formed between the first connection space and the second connection space, and the first heat transfer tube part communicates with the first heat transfer tube part or the second heat exchanger part and the second heat transfer pipe part communicate with each other on both sides of the water chamber. A water chamber cover formed of a fourth communication space for communicating with the first heat transfer pipe part or the second heat transfer pipe part and the cooling water flow path or the cold water flow path is formed.
According to any one of claims 1 to 5,
The large temperature difference refrigerator, characterized in that the first compressor and the second compressor have the same compression ratio.
According to any one of claims 1 to 6,
The low-pressure cooling unit and the high-pressure cooling unit have the same capacity ratio.

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