KR102146834B1 - Cooling and warm water system for simultaneous cultivation of fish species natural circulation type hot and cold water heat exchange system - Google Patents

Abstract

The present invention is a natural circulation type cold and hot water heat exchanger for simultaneous breeding of cold and hot water type fish species that enable both cold and hot water types to be raised simultaneously by using a natural circulation method of cold water and hot water heat exchange method in cultivating fish species. Regarding the system, the high-temperature and high-pressure refrigerant gas is heat-exchanged in the condensed hot water heat exchanger 200 in the compressor 100, and then the condensed liquid is expanded through the receiver tank 210 through the filter dryer 220 and the solenoid 230. The low-temperature refrigerant gas from the valve 240 is sent to the evaporative cold water heat exchanger 300 and the refrigerant gas is circulated to the compressor 100 through the liquid separator 310 and the suction strainer 320, and the condensed hot water heat exchanger ( The hot water of 200) is sent to the hot water heat storage tank 400 and circulated from the hot water heat storage tank 400 to the circulation pump 410 through the filter 420 to the condensed hot water heat exchanger 200. The hot water is sent to the heat exchanger 510 of the filtering device 500 by the circulation pump 430, and the hot water of the filtering device 500 is supplied to the hot water culture tank 10 by the circulation pump 520, and the hot water culture tank ( The aquaculture water of 10) was sent to the filtering device 500 through the water outlet line 12 installed with the water outlet valve 11, and circulated from the filter device 500 to the hot water storage tank 400 through the water outlet line 440. The cold water of the evaporative cold water heat exchanger 300 is sent to the cold water storage tank 600 by the circulation pump 340 and circulated from the cold water storage tank 600 to the evaporative cold water heat exchanger 300 through the filter 620. The cold water of the heat storage tank 600 is sent to the heat exchanger 710 of the filtering device 700 by the circulation pump 630, and the cold water of the filtering device 700 is received by the circulation pump 720 to the cold water culture tank 20 The water from the cold water culture tank 20 is sent to the filtering device 700 through the water outlet line 22 in which the water outlet valve 21 is installed, and through the water outlet line 640 from the filtering device 700, a cold storage heat storage tank ( 600).

Description

Cooling and warm water system for simultaneous cultivation of fish species natural circulation type hot and cold water heat exchange system}

The present invention is a natural circulation type cold and hot water heat exchanger for simultaneous breeding of cold and hot water type fish breeding that allows both cold and hot water type fish to be raised simultaneously using a natural circulation method of cold and hot water heat exchange method in fish farming. In particular, the condensed hot water heat exchanger from the compressor → receiver tank → expansion valve → evaporated cold water heat exchanger → liquid separator circulates back to the compressor, and the condensed hot water heat exchanger and the evaporative cold water heat exchanger are respectively a hot water storage tank and a cold water storage tank. A natural circulation type that supplies and circulates purified cold and hot water through a bio-helix filtration system using a natural circulation method that supplies hot and cold water to the hot and cold water culture tanks. It relates to a heat exchange system for hot and cold water.

In general, warm-water fish species require a water temperature of about 22℃ or higher, and cold-water fish species require a water temperature of about 18℃ or less. In order to breed the above-mentioned cold and hot-water fish species at the same time, heat exchange between the cold-water and hot-water culture tanks. Install and operate separate filtering devices to supply cold and hot water by controlling the temperature required by each culture tank by installing a device, and to purify the cold and hot water from culture tanks contaminated with excess feed and foreign substances from each culture tank. Because it must be done, the facility cost and maintenance cost are increasing, resulting in a decrease in breeding efficiency and economic efficiency.

In order to breed the above mentioned hot water and cold water fish at the same time, cold and hot water heat exchanger to supply cold and hot water at the required temperature to each aquaculture tank, and filtration to purify excess feed and foreign substances generated in each culture tank There is a need for a system capable of simple and precise control of facilities for simultaneously breeding cold and hot water species by forming a single system or a single device and minimizing maintenance costs.

The prior art related to the conventional heat exchanger and cleaning device for fish farms include Patent Publication No. 10-1215457 (multipurpose heat pump system for fish farms), Patent Publication No. 10-1203104 (multipurpose heat pump system) and registered patent publications. No. 10-1205282 (heat exchanger cleaning device of a heat pump system for fish farms) has been proposed.

The first patent is made by additionally including a heat storage tank connected to the primary condensation heat exchanger by a circulation pipe equipped with a primary condensation heat exchanger and a circulation pump installed on a refrigerant pipe corresponding to the compressor and the condensation heat exchanger. In the compressor, the bypass pipe extends from the refrigerant pipe corresponding to the primary condensation heat exchanger, while the bypass pipe is connected to the refrigerant pipe corresponding to the primary condensation heat exchanger and the condensation heat exchanger, and the bypass pipe and the primary condensation heat exchanger A valve mechanism is installed on the refrigerant pipe corresponding to the inlet side of the tank, and the heat storage tank is connected to the heat storage use place of the fish farm by a circulation pipe consisting of a supply pipe and a recovery pipe equipped with a distribution pump.

The second registered patent is that a primary condensation heat exchanger is installed in the refrigerant pipe between the compressor and the condensation heat exchanger, and the heat pump system allows the flow condensation of the refrigerant supplied from the compressor through the primary condensation heat exchanger to be condensed by a flow path switching valve. Or it is a structure that can be adjusted to the refrigerant evaporator side.

The third registered patent is that the cleaning device is installed in the center of the funnel-shaped bottom of the storage tank and the storage tank for storing live fish discharged from the aquaculture tank, water collecting tank, or heat exchanger for a heat pump system, while cleaning the cleaning yarn is stored in the inner lower space. A disturbing mechanism that disturbs and floats the cleaning thread of the port and the cleaning port, and a supply pipe extending from the cleaning port to a supply pump connected to the heat exchanger for the heat pump system and the heat exchanger for the heat pump system extending from the storage tank or cleaning It is a structure that includes a recovery pipe connected to the port.

The first registered patent has the advantage of being able to cultivate a variety of fish by supplying 2-3 kinds of hot or cold water with one heat pump device, but heat exchange with the primary condensation heat exchanger installed between the compressor and the condensation heat exchanger. A storage tank that can be installed is installed separately from the culture tank and supplied from the condensation heat exchanger to the culture tank, and a separate boiler connected to the heat storage tank is installed as an auxiliary heating means of the heat storage water and distributed to the hatching tank, culture tank and air conditioning equipment. Is complex, and separate heat storage tanks and boilers must be installed, and there are problems such as using the aquaculture tank and then returning it to an evaporative heat exchanger through the collection tank, and hot water stored in the heat exchanger, heat storage tank, culture tank, incubation tank and culture tank There is a problem such as no filtration device for purifying foreign substances in cold water.

The second registered patent can generate 2-4 types of hot and cold water at the same time with one heat pump device and can be used for a variety of purposes, but as in the first registered patent, separate one-party condensation heat exchangers and first and second heat exchangers ,A heat storage tank, boiler, air heat exchanger, etc. should be used, and there is a problem such as no filtering device to purify foreign substances in hot water or cold water stored in the aquaculture tank heat source water use place or the heated water use place.

The third registered patent is a method of simply disturbing the cleaner by storing the waste live fish water discharged from the aquaculture tank and the collecting tank into a storage tank, disturbing the stored live fish water by disturbing the cleaner, and supplying it to the heat exchanger. There is a problem in that it is not possible to effectively purify foreign substances in aquaculture tanks and collection tanks by purifying waste live fish water containing

As described above, the conventional structure does not consist of a single device that filters and purifies the cold and hot water while supplying the cold and hot water of the required temperature to the cold and hot water culture tank, and the structure of the device is large and complex. As the cooling and hot water supply and filtration and purification efficiency are insufficient, there is a demand for a cold and hot water heat exchange system that can simultaneously accommodate the filtration and purification of cold and hot water while supplying cold and hot water from a single device.

Therefore, the present invention was created for the purpose of solving the above-described conventional problems. In order to supply cold and hot water of the temperature required in the cold water culture tank and the hot water culture tank in a single system, the condensed hot water heat exchanger and the receiver The condensed hot water heat exchanger uses a natural circulation method in which hot water and cold water are supplied to the cold water storage tank while the condensed hot water heat exchanger is a hot water heat storage tank while circulating back to the compressor through the tank, expansion valve, evaporative cold water heat exchanger and liquid separator. Excess feed, foreign matter, and scale generated in the hot water culture tank, cold, hot water storage tank, condensed hot water, evaporative cold water heat exchanger are surplus in the process of supplying and circulating cold and hot water through a bio-helix-filled filtration device. Since the supply and circulation of cold and hot water containing feed, foreign matter and scale are purified and filtered, it not only supplies cold and hot water of the temperature required by a single system, but also purifies and filters the supplied and circulated cold and hot water. It was possible to provide a natural circulation type cold and hot water heat exchange system for simultaneous breeding of cold and hot water fish species.

In the present invention, the high-temperature and high-pressure refrigerant gas in the compressor is heat-exchanged in the condensed hot water heat exchanger, and the condensed liquid is sent to the evaporated cold water heat exchanger as low-temperature refrigerant gas from the expansion valve through a filter dryer and solenoid through a receiver tank. The condensed hot water is circulated to the compressor through a liquid separator and a suction strainer, and the hot water from the condensed hot water heat exchanger is sent to the hot water heat storage tank and circulated from the hot water heat storage tank to the circulation pump through the filter to the condensed hot water heat exchanger. It is sent to the heat exchanger of the filtration device, and the hot water from the filtration device is received by the circulation pump into the hot water culture tank, and the culture water from the hot water culture tank is sent to the filtration device through the water outlet line installed with a water outlet valve, and the hot water storage tank through the water outlet line The cold water from the evaporative cooling water heat exchanger is sent to the cold water storage tank by a circulation pump and circulated from the cold water storage tank to the evaporative cooling water heat exchanger through a filter, and the cold water from the cold water storage tank is sent to the heat exchanger of the filtering device by a circulation pump and filtered. The cold water of the device is supplied to the cold water culture tank by the circulation pump, and the culture water from the cold water culture tank is sent to the filtration device through the water outlet line installed with the water outlet valve, and circulated from the filtering device to the cold water storage tank through the water outlet line. .

In addition, a heat exchanger is installed inside the filtration device, and bio-helix is filled to heat and cool the aquaculture water in and out of the cold and hot water culture tanks, purify and filter foreign matter and scale, and circulate. The filter is a cold/hot water storage tank Foreign matter and scale of the filter were purified and filtered to circulate.The filtration device supplied backwash water to the backwash water supply line by a circulation pump, and air was supplied to the air supply line to backwash the inside of the filtration device, and then to the backwash water recovery line. It is characterized in that the backwash water can be discharged.

Therefore, in the present invention, the condensed hot water heat exchanger is circulated back to the compressor through the condensed hot water heat exchanger, the receiver tank, the expansion valve, the evaporative cold water heat exchanger and the liquid separator, while the condensed hot water heat exchanger supplies hot water from the hot water storage tank to the hot water culture tank through the filtering device. The evaporative cooling water heat exchanger applies a single system that supplies cold water from the cold water storage tank to the cold water culture tank through the filtration device to supply cold and hot water at the temperature required by each culture tank, as well as the cooling supplied and circulated from the system. , It has the effect of purifying and filtering hot water at the same time.

1 is a structural conceptual diagram showing the entire cycle process of the present invention

Hereinafter, the configuration and operation will be described in detail by linking the subject matter of the invention to the accompanying drawings.

1 is a structural conceptual diagram showing the entire cycle process of the present invention. The condensed hot water heat exchanger is a hot water storage tank while circulating back to the compressor through a condensed hot water heat exchanger, a receiver tank, an expansion valve, an evaporated cold water heat exchanger and a liquid separator. In the filtration unit, hot water is supplied to the hot-water culture tank, and the evaporative cooling water heat exchanger supplies cold water from the cold storage heat storage tank to the cold-water culture tank through the filtration device, and at the same time, the supply and circulation of cold, hot water, foreign matter and scale are purified by the filtering device. And allowed to be filtered is shown.

The refrigerant gas of high temperature and high pressure in the compressor 100 is heat-exchanged in the condensed hot water heat exchanger 200, and the condensed liquid is exchanged through the receiver tank 210 through the filter dryer 220 and the solenoid 230, and the expansion valve 240 The low-temperature refrigerant gas is sent to the evaporative chilled water heat exchanger (300), and the refrigerant gas is circulated to the compressor (100) through the liquid separator (310) and the suction strainer (320), and the hot water of the condensed hot water heat exchanger (200). Is sent to the hot water storage tank 400 and circulated from the hot water storage tank 400 to the circulation pump 410 through the filter 420 to the condensed hot water heat exchanger 200, and the hot water in the hot water storage tank 400 is a circulation pump. It is sent to the heat exchanger 510 of the filtration device 500 to 430, and the hot water from the filtration device 500 is obtained by the circulation pump 520 to the hot water-based aquaculture tank 10, and the hot water in the hot-water culture tank 10 Water is sent to the filtration device 500 through the water outlet line 12 installed with the water outlet valve 11, and circulated from the filter device 500 to the hot water storage tank 400 through the water outlet line 440, and heat exchange of the evaporative cold water. The cold water of the machine 300 is sent to the cold water storage tank 600 by the circulation pump 340 and circulated from the cold water storage tank 600 to the evaporative cold water heat exchanger 300 through the filter 620, and the cold water storage tank 600 The cold water of) is sent to the heat exchanger 710 of the filtering device 700 by the circulation pump 630, and the cold water of the filtering device 700 is obtained by the circulation pump 720 into the cold water culture tank 20, and Aquaculture water from the tank 20 is sent to the filtering device 700 through the water outlet line 22 in which the water outlet valve 21 is installed, and circulates to the cold water storage tank 600 through the water outlet line 640 from the filtering device 700. It is a good structure.

Heat exchangers 510 and 710 are installed inside the filtration devices 500 and 700 and filled with bio-helix to heat the aquaculture water in and out of the cold and hot water aquaculture tanks 10 and 20. It cools, purifies and filters foreign matter and scale, and circulates, and the filters 420 and 620 remove foreign matter and scale from the cold and hot water storage tanks 400 and 600 and the condensed hot water and evaporative cold water heat exchangers 200 and 300. Purified and filtered to allow circulation.

The filtration devices 500 and 700 supply backwash water to the backwash water supply lines 810 and 810' by the circulation pump 800, and supply air to the air supply lines 820 and 820' for filtration. After backwashing the inside of the apparatus 500 and 700, the backwash water can be discharged to the backwash collection lines 830 and 830'.

In the drawings, unexplained symbols (13,23) denote aquaculture tank inlet, (14,24) a ball top valve, (15,25) a culture tank temperature sensor, (16) (26) a drain valve, and (110) a high pressure. Gas lines, 250 and 350 are filter lines, 260 are condensed liquid lines, 270 are site glass, 330 are suction lines, 450 and 650 are heat exchanger intake lines, and 460 and 660 are heat storage tank temperature sensors, (470,670) is a heat storage tank thermometer, (530,730) is a culture tank intake line.

In the present invention as described above, the condensed hot water heat exchanger is circulated back to the compressor through the condensed hot water heat exchanger, the receiver tank, the expansion valve, the evaporated cold water heat exchanger and the liquid separator. The evaporative cooling water heat exchanger applies a single system that supplies cold water from the cold water storage tank to the cold water culture tank through the filtration device, and not only supplies cold and hot water at the temperature required by the cold water and hot water culture tanks, but also supplies and circulates. It is to provide a natural circulation type cold and hot water heat exchange system for simultaneous breeding of cold and hot water type fish that can simultaneously purify and filter the cold and hot water.

As shown in FIG. 1, the present invention condenses hot water and cold water at the temperatures required by the hot water culture tank 10 and the cold water culture tank 20 in the compressor 100, a hot water heat exchanger 200, and a receiver tank. The condensed hot water heat exchanger 200 is evaporated to the hot water heat storage tank 400 while circulating back to the compressor 100 through the expansion valve 240, the evaporated cold water heat exchanger 300 and the liquid separator 310. The heat exchanger 300 supplies and circulates hot water and cold water to the cold water storage tank 600 to the hot water and cold water culture tanks 10 and 20 through the filtering devices 500 and 700. The excess feed and foreign matter in the hot water culture tank 10 and the cold water culture tank 20 are purified and filtered with a filtering device 500 and 700, and a heat exchanger 200 and 300 and a cold/hot water storage tank 400 ) It is configured as a single system to purify and filter foreign matter and scale of 600 with the filters 420 and 620 and to self-backwash the filtering devices 500 and 700.

The above system sends high-pressure, high-temperature refrigerant gas from the compressor 100 to the condensed hot water heat exchanger 200 through the high-pressure gas line 110 to heat exchange the internal aquaculture water to the temperature required by the hot-water aquaculture tank 10. And the condensed liquid is recovered to the receiver tank 210 along the condensed liquid line 260, dried in the filter dryer 220, and then passed through the solenoid 230 valve and the sight glass 270 at low temperature in the expansion valve 240. It expands with refrigerant gas and sends it to the evaporative cold water heat exchanger 300 to heat exchange the aquaculture water inside to the temperature required by the cold water aquaculture tank 20, followed by the liquid separator 310 and the suction strainer along the suction line 330. After separating the liquid through 320), it is circulated to the compressor 100.

The hot water heat-exchanged in the condensed hot water heat exchanger 200 is stored in the hot water storage tank 400, and the stored hot water is a heat exchanger of the filtering device 500 along the heat exchanger intake line 450 by the operation of the circulation pump 430. The hot water from the filtration device 500 is sent to the 510 to heat exchange and the hot water from the filtration device 500 operates the circulation pump 520 to receive it into the hot water-based culture tank 10 along the culture tank intake line 530 so that hot water-based fish species can be cultured. And, the aquaculture water from the hot water culture tank 10 is sent to the filtering device 500 along the water outlet line 12 through the water outlet valve 11 and the hot water heat storage tank along the water outlet line 440 from the filter device 500 400) and circulated to the condensed hot water heat exchanger 200 along the filter line 250 via the filter 420 by the operation of the circulation pump 410 in the hot water storage tank 400.

The filtration device 500 is filled with a bio-helix filter material and a heat exchanger 510 is installed to purify and filter impurities such as excess feed and foreign substances contained in circulating hot water and aquaculture water to maintain good water quality. While doing heat exchange, it was possible to circulate and supply hot water.

The filter 420 installed between the hot water storage tank 400 and the condensed hot water heat exchanger 200 circulates hot water and aquaculture water, while foreign matter and scale of the hot water storage tank 400 and the condensed hot water heat exchanger 200 The impurities of the water are purified and filtered, and the hot water in the hot water measuring tank 400 is checked with the heat storage tank temperature sensor 460 and the heat storage tank thermometer 470, and if the temperature is lower than the temperature required by the aquaculture tank 10, the filter line 250 ) Through the condensed hot water heat exchanger 200 and sent to the hot water heat storage tank 400.

The hot-water culture tank 10 provides aquaculture water by installing a culture tank inlet 13, and when the level of the culture water in the hot-water culture tank 10 is lowered through the ball top valve 14, the culture water can be supplemented. In addition, a culture tank temperature sensor (15) is installed so that the temperature of the culture water can be checked to control the culture temperature. When the culture water from the hot water culture tank (10) is discharged, it can be discharged by the drain valve (16). Made it possible.

The cold water heat exchanged in the evaporative cold water heat exchanger 300 is stored in the cold water storage tank 600 by the circulation pump 340, and the stored cold water is filtered along the heat exchanger intake line 650 by the operation of the circulation pump 630. It is sent to the heat exchanger 710 of 700 for heat exchange, and the cold water of the filtration device 700 is supplied to the cold water culture tank 20 by operating the circulation pump 720 so that cold water fish species can be cultured. Aquaculture water from the aquaculture tank 20 is sent to the filtration device 700 along the water outlet line 22 through the water outlet valve 21 and from the filtering device 700 to the cold water storage tank 600 along the water outlet line 640. It was circulated and circulated from the cold water storage tank 600 to the evaporative cold water heat exchanger 300 along the filter line 350 via the filter 620.

The filtration device 700 is filled with a bio-helix filter material inside and a heat exchanger 710 is installed to purify and filter impurities such as excess feed and foreign substances contained in circulating hot water and aquaculture water to maintain good water quality. While doing heat exchange, it was possible to circulate and supply hot water.

The filter 620 installed between the cold water storage tank 700 and the evaporative cold water heat exchanger 300 circulates cold water and aquaculture water, while foreign matter and scale of the cold water storage tank 600 and the evaporative cold water heat exchanger 300 The impurities are purified and filtered, and the cold water in the cold water measuring tank 600 is checked with the heat storage tank temperature sensor 660 and the heat storage tank thermometer 670, and if the temperature is higher than the temperature required by the culture tank 20, the filter line 350 ) Through the evaporative cold water heat exchanger 300 and sent to the cold water storage tank 600.

The cold water culture tank 20 provides aquaculture water by installing a culture tank inlet 23, and when the level of the culture water in the cold water culture tank 20 decreases through the ball top valve 24, the culture water can be supplemented. In addition, a culture tank temperature sensor (25) is installed so that the temperature of the culture water can be checked to control the culture temperature. When the culture water from the cold water culture tank (20) is discharged, it can be discharged by the drain valve (26). Made it possible.

Filtration devices 500 and 700 filled with the bio-helix and equipped with heat exchangers 510 and 710 operate a circulation pump 800 to supply backwash water to the backwash water supply lines 810 and 810'. By injecting air into the air supply lines 820 and 820 ′, the bio-helix filled in the filtering devices 500 and 700 and foreign substances in the heat exchangers 510 and 710 are backwashed, and the backwashed water is reversed. It was made to be discharged to the washing line 830, 830'.

The present invention is not limited to the specific preferred embodiments described above, and any person with ordinary knowledge in the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims can implement various modifications. And such changes are within the scope of the description of the claims.

10,20: hot water, cold water aquaculture tank 11,21: aquaculture water outlet valve
12,22,440,640: water outlet line 100: compressor
200: condensed hot water heat exchanger 210: receiver tank
220: filter dryer 230: solenoid
240: expansion valve 300: evaporative cooling water heat exchanger
310: liquid separator 320: suction strainer
340,410,430,520,530,720,800: circulation pump
400: hot water heat storage tank 420,620: filter
500,700: filtering device 510,710: heat exchanger
600: cold water storage tank 810,810': backwash water supply line
820,820': air supply line 830,830': backwash recovery line

Claims (3)

The refrigerant gas of high temperature and high pressure in the compressor 100 is heat-exchanged in the condensed hot water heat exchanger 200, and the condensed liquid is exchanged through the receiver tank 210 through the filter dryer 220 and the solenoid 230, and the expansion valve 240 The low-temperature refrigerant gas is sent to the evaporative chilled water heat exchanger (300), and the refrigerant gas is circulated to the compressor (100) through the liquid separator (310) and the suction strainer (320), and the hot water of the condensed hot water heat exchanger (200). Is sent to the hot water storage tank 400 and circulated from the hot water storage tank 400 to the circulation pump 410 through the filter 420 to the condensed hot water heat exchanger 200, and the hot water in the hot water storage tank 400 is a circulation pump. It is sent to the heat exchanger 510 of the filtration device 500 to 430, and the hot water from the filtration device 500 is obtained by the circulation pump 520 to the hot water-based aquaculture tank 10, and the hot water in the hot-water culture tank 10 Water is sent to the filtration device 500 through the water outlet line 12 installed with the water outlet valve 11, and circulated from the filter device 500 to the hot water storage tank 400 through the water outlet line 440, and heat exchange of the evaporative cold water. The cold water of the machine 300 is sent to the cold water storage tank 600 by the circulation pump 340 and circulated from the cold water storage tank 600 to the evaporative cold water heat exchanger 300 through the filter 620, and the cold water storage tank 600 The cold water of) is sent to the heat exchanger 710 of the filtering device 700 by the circulation pump 630, and the cold water of the filtering device 700 is obtained by the circulation pump 720 into the cold water culture tank 20, and Aquaculture water from the tank 20 is sent to the filtering device 700 through the water outlet line 22 in which the water outlet valve 21 is installed, and circulates to the cold water storage tank 600 through the water outlet line 640 from the filtering device 700. Natural circulation type cold and hot water heat exchange system for simultaneous breeding of cold and hot water fish species, characterized in that it is made. The method of claim 1,
Heat exchangers 510 and 710 are installed inside the filtration devices 500 and 700 and filled with bio-helix to heat the aquaculture water entering and leaving the cold and hot water culture tanks 10 and 20, and It cools, purifies and filters foreign matter and scale, and circulates, and the filters 420 and 620 purify and filter foreign matter and scale in the cold and hot water storage tanks 400 and 600 for circulation. Natural circulation type cold and hot water heat exchange system for simultaneous breeding of aqueous fish species. The method of claim 1,
The filtration devices 500 and 700 supply backwash water to the backwash water supply lines 810 and 810' by the circulation pump 800, and supply air to the air supply lines 820 and 820' for filtration. A natural circulation type for simultaneous breeding of cold and hot water fish species, characterized in that the backwash water can be discharged to the backwash collection lines 830 and 830' after backwashing the inside of the device 500, 700. , Hot water heat exchange system.

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