KR101146342B1 - Waste Heat Recovery System For Fish Farm - Google Patents

Abstract

Waste heat recovery system for fish farm according to the present invention is provided with the raw water inlet pipe and the raw water discharge pipe to be vertically spaced apart from each other vertically on one side, and the waste water inlet pipe and vertically spaced apart on the side where the raw water inlet pipe and the raw water discharge pipe is formed A wastewater discharge pipe is provided, and a first flow path through which raw water flowed into the raw water inflow pipe is connected to the raw water discharge pipe, and the first flow path provides a first cross flow path that can be distributed in multiple stages in the vertical direction. A second flow path through which the wastewater introduced into the pipe is moved is formed to lead to the wastewater discharge pipe, and the second flow path may provide a second crossover flow path that may be distributed in multiple stages in the vertical direction, but the raw water and the wastewater may be heat exchanged in a non-mixed state. A heat exchanger in which the first heat exchanger plate and the second heat exchanger plate are alternately aligned, and are installed on the raw water discharge pipe and flow in the raw water discharge pipe. It is provided with a heater for heating the raw water to a predetermined temperature, and the raw water discharge pipe is installed to supply the raw water to the storage target tank, the waste water inlet pipe is installed to extend the waste water from the storage target tank to the heat exchanger.
Waste heat recovery system for fish farms according to the present invention has the advantage that the heat exchange efficiency and heat flow efficiency for the heat exchange between the waste water and the raw water is extended.

Description

Waste Heat Recovery System for Fish Farms

The present invention relates to a waste heat recovery system for fish farms, and more particularly, to a waste heat recovery system for fish farms equipped with a heat exchanger having improved heat exchange efficiency.

In general, high-temperature wastewater is discharged from public baths where a large amount of hot water is used, or factories and fish farms where hot water is used for industrial purposes. Since it is not preferable in terms of the efficient use of energy, it is not preferable to discharge the heat contained in the waste water to the outside without recovering it. Therefore, various waste heat recovery apparatuses are used to recover the heat contained in the waste water and reuse it for the heating of hot water.

In general, the water temperature of fish farms is an important factor not only affecting the growth and survival of fish but also causing the water quality change such as dissolved oxygen. Since the water temperature of the fish farm should be maintained at an appropriate temperature, a boiler was conventionally installed to heat water flowing into the fish farm to a predetermined temperature. However, there is a problem in that the cost of heating the water using a boiler.

As a result, a waste heat recovery system was used to recover and reuse heat from wastewater discharged from fish farms. Wastewater discharged from fish farms contains 27 ~ 28 ℃ of heat and can be recovered and reused. In this case, the hot wastewater discharged through the fish farm will exchange heat with the cold raw water.

The conventional waste heat recovery system recovers waste heat by using a heat exchanger coil or a plate heat exchanger in which cold raw water is circulated on the inner surface of a tank into which hot waste water is introduced. However, the conventional waste heat recovery system has a problem that the waste water or the raw water stays short, and the heat exchange area between the waste water and the raw water is small so that the heat of the waste water cannot be efficiently recovered.

The present invention is to solve the problems as described above, the object is to provide a waste heat recovery system for fish farms that can further increase the heat exchange efficiency from waste water to raw water.

Waste heat recovery system for fish farms for achieving the above object is provided with a raw water inlet pipe and a raw water discharge pipe spaced apart from each other vertically on one side, the raw water inlet pipe and the raw water discharge pipe to be vertically spaced apart from each other vertically A wastewater inflow pipe and a wastewater discharge pipe are provided, and a first flow path through which the raw water introduced into the raw water inflow pipe moves is connected to the raw water discharge pipe, and the first flow path can be distributed in multiple stages in the vertical direction. Providing a flow path, wherein a second flow path through which the wastewater introduced into the wastewater inlet pipe is moved is connected to the wastewater discharge pipe, wherein the second flow path provides a second crossover flow path that can be distributed in multiple stages in the vertical direction; The first heat exchanger plate and the second heat exchanger plate are alternately aligned so that the raw water and the waste water may be exchanged in a non-mixed state. A heat exchanger and a heater installed on the raw water discharge pipe and heating the raw water flowing in the raw water discharge pipe to a predetermined temperature, wherein the raw water discharge pipe is extended to supply raw water to a storage target tank, and the waste water inlet pipe is It is installed to extend the waste water to the heat exchanger from the storage target tank.

Preferably, the first heat exchange plate includes a first through hole formed at a position corresponding to the raw water inlet pipe, a second through hole formed at a position corresponding to the raw water discharge pipe, and a third formed at a position corresponding to the waste water inlet pipe. Raw water flowing into the first and second through holes provided with a through-hole, a fourth through-hole formed in a position corresponding to the waste water discharge pipe, and a first flow space through which the waste water flowing into the third and fourth through-holes can be mutually distributed. And a first heat transfer flow path partitioned so as not to be mixed with the second heat exchange plate, wherein the second heat exchange plate includes the first through hole formed at a position corresponding to the raw water inlet pipe, and the second formed at a position corresponding to the raw water discharge pipe. A through hole, the third through hole formed at a position corresponding to the waste water inlet pipe, and a fourth through hole formed at a position corresponding to the waste water discharge pipe, and formed in the first and second through holes. A second flow passage partition wall is provided to provide a second flow space through which the raw water flowing into each other can be circulated, but is not mixed with the wastewater flowing into the third and fourth through holes.

The heat exchanger includes a fixed plate on which the raw water inlet pipe, the raw water discharge pipe, the wastewater inlet pipe, and the wastewater discharge pipe are formed, and a support frame installed to movably constrain the plurality of first and second heat exchange plates from the fixed plate; A movable plate that is movably supported by a support frame and is formed on both sides of the fixed plate, the first and second heat exchange plates, and the movable plate to closely contact and separate the first and second heat exchange plates from the fixed plate. It may further include a sliding guide member for aligning the first and second heat exchange plates and the movable plate, and a hydraulic device installed to advance and retract the movable plate in the fixed plate direction.

The first heat exchange plate includes a first zigzag pattern guide member capable of inducing a flow of water in a zigzag pattern between a third hole and a fourth hole in the first heat transfer flow path partition wall providing the first flow space. The second heat exchanger plate may include a second zigzag pattern guide member capable of inducing a flow of water in a zigzag pattern between the first through holes and the second through holes in the second heat transfer flow path partition wall providing the second flow space.

Waste heat recovery system for fish farms according to the present invention has the advantage that the heat exchange efficiency and heat flow efficiency for the heat exchange between the waste water and the raw water is extended.

1 is a block diagram of a waste heat recovery system for fish farms according to the present invention,
Figure 2 is a perspective view showing a heat exchanger of the waste heat recovery system for fish farms of Figure 1,
3 is a view showing a flow path of waste water and raw water of the heat exchanger of FIG.
4 is an enlarged perspective view illustrating a first heat exchange plate and a second heat exchange plate of the heat exchanger of FIG. 2;
5 is a perspective view illustrating another embodiment of a first heat exchange plate and a second heat exchange plate of the heat exchanger of FIG. 2;

Hereinafter, with reference to the accompanying drawings will be described in more detail the waste heat recovery system for fish farms according to a first embodiment of the invention.

1 is a block diagram of a waste heat recovery system for fish farms according to the present invention, Figure 2 is a perspective view showing a heat exchanger of the waste heat recovery system for fish farms of Figure 1, Figure 3 is a view showing the waste water and the raw water flow path of the heat exchanger of Figure 2 4 is an enlarged perspective view illustrating a first heat exchange plate and a second heat exchange plate of the heat exchanger of FIG. 2.

Referring to the drawings, the waste heat recovery system for fish farm 100 is a heat exchanger 60, raw water inlet pipe 20, wastewater inlet pipe 32, raw water discharge pipe 26, wastewater discharge pipe 30, heater 28 It is provided.

The heat exchanger 60 is provided with a raw water inlet pipe 20, a raw water discharge pipe 26, a wastewater inlet pipe 32, and a wastewater discharge pipe 30 spaced apart from each other on one side.

In the heat exchanger 60, a plurality of first and second heat exchange plates 70 and 80 to be described later are alternately aligned, and raw water introduced into the raw water inlet pipe 20 as illustrated in FIG. 3 is a raw water discharge pipe. A first flow path 62 is formed to lead to 26, and a second flow path 64 is formed so that the wastewater introduced into the waste water inlet pipe 32 is led to the waste water discharge pipe 30.

Here, the first flow path 62 is formed to have a first cross flow path 62a that can be distributed in multiple stages in the up and down direction, and the second flow path 64 can also be flowed in multiple stages in the up and down direction. 64a).

In addition, in the heat exchanger 60 is formed so that the raw water and waste water can be heat exchanged in a non-mixed state.

The heat exchanger 60 includes a fixed plate 61, first and second heat exchange plates 70 and 80, a support frame 40, a movable plate 65, and a sliding guide member 50.

The fixed plate 61 is composed of a first vertical plate 61a and a first horizontal plate 61b for supporting the first vertical plate 61a with respect to the ground.

The first vertical plate 61a is provided with a raw water inlet pipe 20 and a raw water discharge pipe 26 so as to be spaced apart from each other vertically on one side, and the raw water inlet pipe 20 and the raw water discharge pipe 26 are formed. The wastewater inflow pipe 32 and the wastewater discharge pipe 30 are provided so as to be spaced apart from each other vertically.

The first vertical plate 61a has a plurality of first coupling grooves 63 formed at both sides thereof to allow the sliding guide member 50 to be coupled thereto.

On the front surface of the first vertical plate 61a and the bottom surface of the first horizontal plate 61b, the heat insulating plates 92 and 94 are provided to prevent the heat exchanged by the first and second heat exchange plates 70 and 80 from flowing out. Is attached. Insulation plates 92 and 94 are Al ₂ O ₃ 82%, SiO ₂ 15%, and SiC 3%, and are attached to the first vertical plate 61a and the first horizontal plate 61b with silica bonds.

As described above, the first heat exchange plate 70 and the second heat exchange plate 80 are alternately arranged in close contact with each other so that the first flow path 62 and the second flow path 62 having the first cross flow path 62 a described above. The second flow path 64 having the cross flow path 64a can be formed, which will be described in detail with reference to FIG. 4.

The first heat exchange plate 70 includes a first base member 72, a first heat transfer path partition wall 77 formed on the first base member 72, and a first zigzag pattern guide member 78.

The first base member 72 is formed in the shape of a rectangular plate-shaped plate, the first guide groove 79 formed to be drawn downward in the center of the upper end, and the second guide groove formed to be drawn upward in the center of the lower end ( 71) is formed.

The first base member 72 has first to fourth through holes in the corners corresponding to the raw water inlet pipe 20, the raw water discharge pipe 26, the wastewater inlet pipe 32, and the wastewater discharge pipe 30, respectively. 75, 73, 74, and 76) are formed.

As described above, the first heat transfer path partition wall 77 is formed on the upper surface of the first heat exchange plate 70 to form a closed orbit in the form of a closed track, and the second heat exchange plate 80 is in close contact with the rear surface of the second heat exchange plate 80. The first flow space 77a corresponding to the cross flow path 64a can be formed.

That is, the first heat exchange flow path 77 provides a first flow space 77a through which the wastewater flowing into the third and fourth through holes 74 and 76 can be mutually distributed, but the first and second through holes 75, 73 is partitioned so as not to mix with the raw water flowing into. Reference numerals 75a and 74a are formed to independently surround each of the first and second through holes 75 and 74 to partition the first flow space 77a and provide a flow path with the next order heat exchanger plate, respectively. It is a bulkhead. A plurality of dimples may be formed in the first flow space 77a to promote turbulence of the wastewater.

Preferably, the first heat transfer flow path 77 determines the trajectory on the first base member 72 so that the first flow space 77a can be sufficiently expanded.

The first zigzag pattern guide member 78 is applied to extend the residence time by extending the movement path when the wastewater moves in the vertical direction through the first flow space 77a. In order to induce the flow of water in a zigzag pattern between the plurality is formed in the shape of a bar extending in the horizontal direction.

The first zigzag pattern guide member 78 increases the residence time of the wastewater flowing through the first flow space 77a to increase heat exchange efficiency.

The second heat exchange plate 80 has a rear surface the same as that of the first heat exchange plate 70, and an upper surface thereof is formed in a shape opposite to that of the first heat exchange plate 70.

The second heat exchange plate 80 is divided into a second base member 82, a second heat transfer path partition wall 87 formed on the second base member 82, and a second zigzag pattern guide member 88. do.

The second base member 82 is formed in the shape of a rectangular plate, and has a third guide groove 89 formed downwardly in the center of the upper end and a fourth guide groove formed upwardly in the center of the lower end. 81) is formed.

The second base member 82 has first to fourth through holes at corners corresponding to the raw water inlet pipe 20, the raw water discharge pipe 26, the wastewater inlet pipe 32, and the wastewater discharge pipe 30, respectively. 85, 83, 84, 86) are formed.

As described above, the second heat transfer path partition wall 87 is formed on the upper surface of the second heat exchange plate 80 to form a closed orbit in the form of a closed orbit and is in close contact with the rear surface of the first heat exchange plate 70. The second flow space 87a corresponding to the cross flow passage 62a can be formed.

That is, the second heat transfer flow path 87 provides a second flow space 87a through which the raw water flowing into the first and second through holes 85 and 83 can flow through the third and fourth through holes 84, 86) is partitioned so as not to mix with the wastewater flowing into. Reference numerals 84a and 86a are formed to independently surround each of the third and fourth through holes 84 and 86 to partition the second flow space 87a and provide a flow path with the next heat exchange plate, respectively. It is a bulkhead. A plurality of dimples may be formed in the second flow space 87a to promote turbulence of the wastewater.

Preferably, the second heat transfer flow path 87 determines the trajectory on the second base member 82 so that the second flow space 87a can be sufficiently expanded.

The second zigzag pattern guide member 88 is used to extend the residence time by extending the movement path when the raw water moves up and down through the second flow space 87a. The first through holes 85 and the second through holes 83 In order to induce the flow of water in a zigzag pattern between the plurality is formed in the shape of a bar extending in the horizontal direction.

The second zigzag pattern guide member 88 increases the residence time of the raw water flowing through the second flow space 87a to increase heat exchange efficiency.

The second heat exchange plate 80 is formed in a form in which the first heat exchange plate 70 is rotated by 180 °, and the first heat exchange plate 80 is used to check the coupling state of the first and second heat exchange plates 70 and 80. First and second positioning grooves 72a and 82a may be provided in the 70 and 80.

5 illustrates a perspective view of another embodiment of the first heat exchange plate and the second heat exchange plate of the heat exchanger of FIG. 2.

The first heat exchange plate 70 has a positioning groove 72a formed at one side edge thereof. The first positioning groove 72a is formed to be spaced a predetermined length from the center to the top or the bottom. The second positioning groove 82a is formed at a position rotated by 180 ° from the position where the first positioning groove 72a is provided. Since the first positioning groove 72a and the second positioning groove 82a are provided at positions rotated 180 ° with each other, the first heat exchange plate 70 when the first heat exchange plate 70 and the second heat exchange plate 80 are combined with each other. ) And the second heat exchange plate 80 may be alternately coupled.

The support frame 40 is coupled to the fixed plate 61 to move the movable plate 65 and the first and second heat exchanger plates relative to the fixed plate 61 along the array direction of the first and second heat exchanger plates 70 and 80. 70 and 80 are formed to be movably constrained.

The support frame 40 is divided into a first horizontal frame 42, a second horizontal frame 44, a third horizontal frame 46, and a vertical frame 48.

The first horizontal frame 42 guides the linear movement of the movable plate 65 to a portion of which one side extends horizontally from the top center of the fixed plate 61.

The second horizontal frame 44 is a portion extending horizontally from the center of the upper end of the fixing plate 61 below the first horizontal frame 42 and formed on the upper end of the first and second heat exchange plates 70 and 80. First and third guide grooves 79 and 89 are inserted to support the upper ends of the first and second heat exchange plates 70 and 80 so as to be movable horizontally.

The third horizontal frame 46 is a portion extending horizontally from the bottom center of the fixing plate 61 to the second and fourth guide grooves 71 and 81 formed at the bottom of the first and second heat exchange plates 70 and 80. This insertion is performed to support the first and second heat exchange plates 70 and 80 so as to be movable horizontally.

The vertical frame 48 is a portion that interconnects the other ends of the first, second, and third horizontal frames 42, 44, and 46.

The moving plate 65 is composed of a second vertical plate 65a and a second horizontal plate 65b provided at one end of the second vertical plate 65a to support the second vertical plate 65a with respect to the ground. .

The second vertical plate 65a has a first support groove 66 formed thereon so as to be movable on the first horizontal frame 42 and the second support groove at a position corresponding to the second horizontal frame 44. 67 is formed, and the third support groove 68 is formed at a position corresponding to the third horizontal frame 46.

On the rear surface of the second vertical plate 65a and the bottom of the second horizontal plate 65b, heat insulating plates 96 and 98 are provided to prevent the heat exchanged by the first and second heat exchange plates 70 and 80 from flowing out. Is attached. The heat insulating plates 96 and 98 are formed of 82% Al ₂ O ₃ , 15% SiO ₂ , and 3% SiC, and are attached to the second vertical plate 65a and the second horizontal plate 65b with silica bonds.

In addition, the second vertical plate (65a) is formed in a position corresponding to the first coupling groove (63) of the first vertical plate (61a) a plurality of second coupling on both sides so that the sliding guide member 50 can be coupled The groove 69 is formed. The moving plate 65 is installed at the rear of the heat exchange plate rearmost from the fixed plate 61 among the first and second heat exchange plates 70 and 80.

The moving plate 65 closely or separates the first and second heat exchange plates 70 and 80 from the fixed plate 61 by the positional movement.

The sliding guide member 50 is fitted through the first coupling groove 63 of the fixed plate 61 and the second coupling groove 69 of the movable plate 65.

The sliding guide member 50 is threaded so that the movable plate 65 can be tightened or detached to be in close contact with the fixed plate 61 by the movement of the nut 52.

Raw water inlet pipe 20 is connected to the raw water supply pipe for supplying raw water of low temperature.

The raw water inlet pipe 20 may be provided with a filter 22 to filter foreign matters of the raw water supplied to the heat exchanger 60.

The raw water discharge pipe 26 is extended to supply raw water that has passed through the heat exchanger 60 to the storage target tank 10.

The heater 28 is installed on the raw water discharge pipe 26 so as to heat the raw water passed through the heat exchanger 60.

The raw water discharge pipe 26 may be provided with a bypass line 29 to return the raw water to the front of the heater 28 when the raw water past the heater 28 does not rise to the target temperature to heat the raw water again. .

The wastewater inlet pipe 32 is installed to extend the hot water into the heat exchanger 60 from the storage tank 10, and a pump 38 is installed to discharge the wastewater from the storage tank 10. The wastewater inlet pipe 30 is provided with a filter 36 to remove the foreign matter in the wastewater and then supply the wastewater to the heat exchanger 60.

Wastewater discharge pipe 40 is installed to extend so as to transfer the wastewater passed through the heat exchanger 60 to the discharge position.

 Referring to the operation of the waste heat recovery system for fish farms of the present invention configured as described above are as follows.

Low temperature raw water is introduced into the heat exchanger 60 through the raw water inlet pipe (20). The high temperature wastewater is discharged from the storage target tank 10 to the wastewater inlet pipe 32, passes through the filter 36, and foreign matters are removed and introduced into the heat exchanger 60. The low temperature raw water introduced into the heat exchanger 60 flows along the first flow path 62 in the heat exchanger 60, and the high temperature wastewater introduced into the heat exchanger 60 flows along the second flow path 64. Flows. In addition, the raw water flowing along the first flow path 62 flows along the first cross flow path 62a, and the wastewater flowing along the second flow path 64 flows along the second cross flow path 64a. Since the raw water and the waste water flow along the first cross flow passage 62a and the second cross flow passage 64a with the heat exchange plate interposed therebetween, the high temperature waste water transfers heat to the heat exchange plate to heat the low temperature waste water. The raw water passing through the heat exchanger 60 flows along the raw water discharge pipe 26 and is heated to the target temperature by the heater 28 and then supplied to the storage target tank 10. And the wastewater passed through the heat exchanger 60 is discharged to the wastewater discharge pipe 30 is discarded to the outside.

Waste heat recovery system for fish farms according to the present invention is extended heat flow efficiency and residence time for heat exchange between waste water and raw water is improved heat exchange efficiency, it is easy to separate and assemble.

The present invention as described and illustrated above is not intended to be limited to the above embodiments, and may be modified in various forms without departing from the spirit of the present invention.

Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

Waste heat recovery system for fish farms according to the present invention can be used in a variety of facilities, such as fish farms, baths.

100; Waste heat recovery system 10 for fish farms; Storage tank
20; Raw water inlet pipe 36; Raw water discharge pipe
30; Wastewater discharge pipe 32; Wastewater Inlet Pipe
60; Heat exchanger 70; 1st heat exchanger plate
80; 2nd heat exchanger plate

Claims (4)

The raw water inlet pipe and the raw water discharge pipe are provided on one side to be vertically spaced apart from each other, and the waste water inlet pipe and the waste water discharge pipe are provided on the side surface where the raw water inlet pipe and the raw water discharge pipe are formed to be spaced vertically apart from each other. A first flow path through which the raw water introduced into the water inlet pipe is moved to be connected to the raw water discharge pipe, wherein the first flow path provides a first cross flow path that can be distributed in multiple stages in the vertical direction, and is introduced into the waste water inlet pipe. A second flow path through which the waste water is moved is formed to lead to the waste water discharge pipe, and the second flow path may provide a second cross flow path that may be distributed in multiple stages in the vertical direction, and the raw water and the waste water may be heat-exchanged in an unmixed state. A heat exchanger in which the first heat exchanger plate and the second heat exchanger plate are alternately aligned;
And a heater installed on the raw water discharge pipe and heating the raw water flowing in the raw water discharge pipe to a predetermined temperature.
The raw water discharge pipe is installed to extend the raw water to the storage target tank,
The waste water inlet pipe is a waste heat recovery system for fish farms, characterized in that the extension is installed so that the waste water from the tank to be stored into the heat exchanger. The method of claim 1,
The first heat exchange plate includes a first through hole formed at a position corresponding to the raw water inlet pipe, a second through hole formed at a position corresponding to the raw water discharge pipe, a third through hole formed at a position corresponding to the waste water inlet pipe, A fourth flow hole formed at a position corresponding to the waste water discharge pipe, and a first flow space through which the waste water flowing into the third and fourth holes flows to each other, but is mixed with the raw water flowing into the first and second holes; It is provided with a first heat transfer flow path partitioned so that
The second heat exchange plate may include the first through hole formed at a position corresponding to the raw water inlet pipe, the second through hole formed at a position corresponding to the raw water discharge pipe, and the third formed at a position corresponding to the waste water inlet pipe. A through-hole and the fourth through-hole formed in a position corresponding to the waste water discharge pipe is formed, providing a second flow space through which the raw water flowing into the first, second through hole can be mutually distributed, the third, fourth through Waste heat recovery system for fish farms, characterized in that it comprises a second heat transfer flow path partition partitioned so as not to mix with the waste water flowing into. The method of claim 2,
The heat exchanger is provided at one end of the first vertical plate and the first vertical plate and the raw water inlet pipe, the raw water discharge pipe, the wastewater inlet pipe, the wastewater discharge pipe and the heat insulation plate is provided on the front surface of the first vertical plate with respect to the ground. A fixed plate having a first horizontal plate having a bottom plate having a heat insulating plate on the bottom thereof, a support frame provided to movably constrain the plurality of first and second heat exchange plates from the fixed plate, and a movable frame provided on the support frame; And a second horizontal plate provided at one end of the second vertical plate and a second horizontal plate provided at one end of the second vertical plate and supporting the second vertical plate against the ground and provided with a heat insulating plate at the bottom thereof. 2 a moving plate for closely contacting and separating the heat exchange plates to the fixed plate, the fixed plate, the first and second heat exchange plates, and the moving plate. Is formed on both sides of the site, and further comprising a guide member for the sleeve ahding aligned to the first and second heat exchange plate and the moving plate,
The insulation plate is formed of 82% Al ₂ O ₃ , 15% SiO ₂ , 3% SiC,
The first heat exchange plate has the same structure as the second heat exchange plate when rotated 180 °,
The first heat exchange plate is a waste heat recovery system for fish farms, characterized in that a positioning groove for confirming the state of rotationally coupled to one side of the edge. The method of claim 2,
The first heat exchange plate is provided with a first zigzag pattern guide member capable of inducing a flow of water in a zigzag pattern between the third and fourth through holes in the first heat transfer flow path partition wall providing the first flow space.
The second heat exchanger plate may include a second zigzag pattern guide member capable of inducing a flow of water in a zigzag pattern between the first through holes and the second through holes in the second heat transfer flow path partition wall providing the second flow space. Waste heat recovery system for fish farms.

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