JP7093676B2 - Livestock house heating system - Google Patents

Description

The present invention relates to a barn heating system.

The livestock house heating system is required to maintain a good livestock breeding environment. For example, in a poultry farming system, it is necessary to take measures against the cold in winter and the heat in summer in order to maintain a good chicken breeding environment. In particular, newborn chicks are vulnerable and need to be bred in a hot environment.

In this regard, for example, Patent Document 1 below discloses that a boiler is used to supply and heat hot water in a livestock facility such as a poultry farm.

Japanese Unexamined Patent Publication No. 2008-11165

However, since fossil fuels are used in the method described in Patent Document 1, the generation of carbon dioxide contributes to the deterioration of the environment on a global scale.

On the other hand, the heat generated inside, such as the amount of heat generated from livestock and the heat for driving a ventilation fan for taking in fresh air ventilation, is wasted to the outside. On the other hand, the present inventors have earnestly studied to improve the efficiency (coefficient of performance, hereinafter COP) of the heat pump in the livestock barn heating system by effectively utilizing these low temperature waste heats.

The present invention has been made as a result of such studies, and an object of the present invention is to provide a livestock barn heating system capable of achieving a higher COP while considering the environment.

The livestock house heating system according to the present invention that achieves the above object includes a plurality of livestock houses in which livestock are raised and a heat pump capable of simultaneously taking out cold heat and hot heat, and the heat pump is one said livestock house. The waste heat generated from the above is taken in and supplied to the other livestock barn as the heat. Further, the heat pump includes a first flow path, a second flow path, and a third flow path, and the second flow path and the third flow path are branched from the first flow path and the first flow path. The refrigerant flow path through which the refrigerant circulates and the refrigerant provided in the first flow path and passing through the first flow path are compressed to raise the temperature of the refrigerant. The first medium is heated by the machine, an expansion valve that expands the refrigerant to lower the temperature of the refrigerant, and the refrigerant provided in the first flow path and circulating from the compressor toward the expansion valve. The hot water heat exchanger, the cold water heat exchanger that cools the second medium by the refrigerant provided in the second flow path and circulating from the expansion valve toward the compressor, and the third flow path. An air heat exchanger that cools the air having the waste heat taken in from the one livestock barn and the air heat exchanger that is provided and circulates from the expansion valve toward the compressor. It has a discharge fan for discharging the air to the outside, and a switching valve for switching the supply of the refrigerant passing through the first flow path to the second flow path or the third flow path.

According to the livestock barn heating system configured as described above, an electric heat pump is used as a power source for heating without using a fossil fuel bleeder device or a boiler. Therefore, it is possible to suppress the emission of carbon dioxide. Further, since the heat pump takes in the waste heat generated from one livestock barn and supplies it as heat to another livestock barn, a higher COP can be realized.

It is a system diagram which shows the poultry farming system which concerns on this embodiment. It is a system diagram which shows the heat pump of the poultry farming system which concerns on this embodiment. It is a schematic diagram for demonstrating the structure of the cleaning part.

An embodiment of the present invention will be described with reference to FIGS. 1 to 3. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted. The dimensional ratios in the drawings are exaggerated for convenience of explanation and may differ from the actual ratios.

In this embodiment, a poultry farming system for raising chickens will be described as an example of a livestock barn heating system.

FIG. 1 is a system diagram showing a poultry farming system 1 according to the present embodiment. FIG. 2 is a system diagram showing a heat pump 20 of the poultry farming system 1 according to the present embodiment. FIG. 3 is a schematic view for explaining the configuration of the cleaning unit 50.

As shown in FIG. 1, the poultry farming system 1 includes two poultry houses 10 (10A and 10B) in which chickens are raised, a heat pump 20 capable of simultaneously taking out cold and hot heat, and a heating path 30 for heating the chicken house 10. It has a cooling path 40 for cooling the drinking water supplied to the chicken, a water supply pipe 60 for supplying water to the chicken, and a water supply pipe heat exchanger 70 for cooling the drinking water flowing inside the water supply pipe 60.

In this embodiment, the poultry farming system 1 has two poultry houses 10A and 10B. Adult chickens C2 are bred in the first poultry house 10A. In the second poultry house 10B, young chicks C1 are bred. The two poultry houses 10A and 10B have the same configuration. Hereinafter, the configuration of the poultry house 10 will be described with the first poultry house 10A and the second poultry house 10B collectively referred to as the poultry house 10.

As shown in FIG. 1, a heating path 30 is arranged under the floor of the poultry house 10. Further, a ventilation fan 12 is attached to the left wall 11 of the poultry house 10.

The ventilation fan 12 is rotated by a motor (not shown). Here, the rotation of the motor causes the motor itself to generate heat, which is discarded as waste heat from the ventilation fan 12 to the outside of the poultry house 10 and taken into the heat pump 20.

For example, a bedding straw is placed on the floor of the poultry house 10, on which adult chickens C2 and young chicks C1 are bred. Adult chicken C2 dissipates heat by metabolism, and the heat is discarded as waste heat outside the poultry house 10 and taken into the heat pump 20 (see the dotted arrow in FIG. 1).

A lamp (not shown) that illuminates the inside of the poultry house 10 is attached to the ceiling of the poultry house 10. Here, the heat generated from the lamp is discarded as waste heat outside the poultry house 10 and taken into the heat pump 20.

The heat pump 20 is configured so that cold heat and hot heat can be taken out at the same time. Further, the heat pump 20 is also configured so that only heat can be taken out. Since the heat pump 20 is an electric type, it does not use fire and does not need to worry about fire. Hereinafter, the configuration of the heat pump 20 will be described in detail with reference to FIG.

As shown in FIG. 2, the heat pump 20 is provided in a refrigerant flow path 21 through which the refrigerant circulates, a compressor 22 for compressing the refrigerant, an expansion valve 23 for expanding the refrigerant, and a first medium for circulating in the heating path 30. The hot water heat exchanger 24 that supplies hot heat, the cold water heat exchanger 25 that supplies cold heat to the second medium circulating in the cooling path 40, and the air heat that cools the air with waste heat taken in from the first chicken house 10A. It has a exchanger 26, an exhaust fan 27 for discharging air cooled by the air heat exchanger 26 to the outside, and a switching valve 28 provided on the downstream side of the hot water heat exchanger 24. The refrigerant circulating in the refrigerant flow path 21 is not particularly limited, but carbon dioxide can be used, for example.

Here, examples of the waste heat taken out from the first poultry house 10A include heat dissipation by metabolism of adult chicken C2, heat generation by the ventilation fan 12, heat generation by the light in the poultry house 10, and radiant heat by sunlight.

The refrigerant flow path 21 includes a first flow path 21a for heating the first medium circulating in the heating path 30, a second flow path 21b for cooling the second medium circulating in the cooling path 40, and a first poultry house 10A. It has a third flow path 21c for cooling the air having waste heat taken in from.

As shown in FIG. 2, the first flow path 21a branches into the second flow path 21b and the third flow path 21c at the position where the switching valve 28 is provided. Further, the branched second flow path 21b and the third flow path 21c join the first flow path 21a at the merging portion 21d.

The compressor 22 is provided in the first flow path 21a. The compressor 22 is not particularly limited, but for example, a CO ₂ refrigerator can be used. As the refrigerant is compressed as it passes through the compressor 22, the compressor 22 raises the temperature of the refrigerant. The temperature of the refrigerant before passing through the compressor 22 is, for example, 5 ° C., and the temperature of the refrigerant after passing through the compressor 22 is, for example, 90 ° C.

The expansion valve 23 is provided in the second flow path 21b and the third flow path 21c, respectively. The expansion valve 23 provided in the second flow path 21b is arranged between the switching valve 28 and the chilled water heat exchanger 25. The expansion valve 23 provided in the third flow path 21c is arranged between the switching valve 28 and the air heat exchanger 26. Only one expansion valve 23 may be arranged between the hot water heat exchanger 24 and the switching valve 28. As the refrigerant expands as it passes through the expansion valve 23, the expansion valve 23 lowers the temperature of the refrigerant. The temperature of the refrigerant before passing through the expansion valve 23 is, for example, 60 ° C., and the temperature of the refrigerant after passing through the expansion valve 23 is, for example, 5 ° C.

The hot water heat exchanger 24 is arranged between the compressor 22 and the expansion valve 23 in the first flow path 21a. The hot water heat exchanger 24 heats the first medium circulating in the heating path 30 by the high-temperature refrigerant circulating from the compressor 22 toward the expansion valve 23.

The chilled water heat exchanger 25 is arranged between the expansion valve 23 and the compressor 22 in the second flow path 21b. The chilled water heat exchanger 25 cools the second medium circulating in the cooling path 40 by the low-temperature refrigerant circulating from the expansion valve 23 toward the compressor 22.

The air heat exchanger 26 is arranged between the expansion valve 23 and the compressor 22 in the third flow path 21c. The air heat exchanger 26 cools the air having waste heat taken in from the first chicken house 10A by a low-temperature refrigerant circulating from the expansion valve 23 toward the compressor 22.

The air heat exchanger 26 is cleaned by the cleaning unit 50 as shown in FIG. Generally, a large amount of dust due to chicken manure, hair loss, and dust is suspended in the air in the poultry house 10. Therefore, when air is taken into the air heat exchanger 26 of the heat pump 20 from the first chicken house 10A, dust adheres to the fins of the air heat exchanger 26 and causes clogging, so that waste heat can be recovered. It disappears.

In the poultry farming system 1 according to the present embodiment, since the fins of the air heat exchanger 26 are washed by the washing unit 50, it is possible to suitably prevent the above-mentioned event from occurring.

As shown in FIG. 3, the cleaning unit 50 includes an air compressor 51, a pipe 52 through which high-pressure air passes, a switching valve 53, an intermittent timer 54, and an air pipe 55. According to the cleaning unit 50 configured in this way, the dust adhering to the fins of the air heat exchanger 26 can be periodically blown off by the high-pressure air ejected from the air pipe 55. Further, it is preferable that the air pipe 55 is arranged so as to be movable in the vertical direction in FIG. According to this configuration, the entire surface of the fins of the air heat exchanger 26 can be cleaned.

The exhaust fan 27 is arranged adjacent to the air heat exchanger 26. The exhaust fan 27 discharges the air cooled by the air heat exchanger 26 to the outside.

The switching valve 28 switches the supply of the refrigerant passing through the first flow path 21a to the second flow path 21b or the third flow path 21c.

According to the heat pump 20 configured as described above, for example, by switching the switching valve 28 so that the refrigerant passing through the first flow path 21a is supplied to the second flow path 21b, the first flow path 21a And the second flow path 21b are connected. As a result, the hot water heat exchanger 24 heats the first medium circulating in the heating path 30, and the cold water heat exchanger 25 cools the second medium circulating in the cooling path 40. Therefore, the heat pump 20 is in a state where hot and cold heat can be taken out at the same time.

On the other hand, the first flow path 21a and the third flow path 21c are connected by switching the switching valve 28 so that the refrigerant passing through the first flow path 21a is supplied to the third flow path 21c. As a result, the hot water heat exchanger 24 heats the first medium circulating in the heating path 30, and the air heat exchanger 26 cools the air having the waste heat taken in from the first chicken house 10A, and discharges the fan. By 27, the cooled air is discharged to the outside. Therefore, the heat pump 20 is in a state where only heat can be taken out.

At this time, when the air heat exchanger 26 uses the air taken in from the cold outside air without taking in the waste heat from the first chicken house 10A, for example, the hot water heat exchanger 24 raises the first medium to a predetermined temperature. The power required to make it increase becomes large, and the energy at that time is defined as energy Q1. On the other hand, in the present embodiment, when warm waste heat is taken in from the first poultry house 10A, the power required to raise the first medium to a predetermined temperature in the hot water heat exchanger 24 is reduced, and at that time. It is assumed that the energy of is energy Q2.

In winter, the energy Q2 is less than the energy Q1 because the air taken in from the outside air is lower than the temperature of the waste heat taken in from the first poultry house 10A. Therefore, the COP of the poultry farming system 1 can be further increased by extracting a large amount of heat with a small amount of energy.

Returning to FIG. 1, the heating path 30 heats the poultry house 10 by circulating the first medium heated by the heat taken out from the heat pump 20 inside. As shown in FIG. 1, the heating path 30 is arranged under the floor of the poultry house 10.

The circulation of the first medium in the heating path 30 is performed by the heating pump P1. The first medium circulating in the heating path 30 is not particularly limited, but is, for example, water. The temperature of the first medium circulating in the heating path 30 is, for example, 65 ° C.

As shown in FIG. 1, the cooling path 40 cools the drinking water supplied to the chicken by circulating the second medium cooled by the cold heat taken out from the heat pump 20 inside. As shown in FIG. 1, the cooling path 40 receives cold heat from the chilled water heat exchanger 25.

The circulation of the second medium in the cooling path 40 is performed by the cooling pump P2. The second medium circulating in the cooling path 40 is not particularly limited, but is, for example, water. The temperature of the second medium circulating in the cooling path 40 is, for example, 7 to 10 ° C.

The water supply pipe 60 pumps water from the well 85 by a pump P3 and supplies it to chickens as drinking water. A nipple type water dispenser 60a for the young chick C1 or the adult chicken C2 to drink water is attached to the water supply pipe 60. The nipple type water dispenser 60a is arranged so as to be movable up and down so that the young chick C1 or the adult chicken C2 can drink water suitably.

The water supply pipe heat exchanger 70 is arranged above the water supply pipe 60. A cooling path 40 is provided inside the water supply pipe heat exchanger 70. The water supply pipe heat exchanger 70 can cool the drinking water flowing through the water supply pipe 60 to, for example, 10 to 20 ° C. by the cold heat of the second medium.

Next, a method of raising chickens by the poultry farming system 1 according to the present embodiment will be described. Hereinafter, the method of raising chickens by the poultry farming system 1 will be described separately for the cases where the seasons are summer and winter.

First, the case of summer will be described.

In summer, it is necessary to cool the drinking water of adult chicken C2 and young chick C1. It is preferable that the young chick C1 is in a higher temperature environment than the adult chicken C2.

In the summer, the switching valve 28 shown in FIG. 2 is switched to connect the first flow path 21a and the second flow path 21b so that hot and cold heat can be taken out from the heat pump 20 at the same time. As a result, the heating path 30 can heat the inside of the second poultry house 10B from under the floor in the second poultry house 10B. Therefore, it is possible to provide a suitable rearing environment for the young chick C1.

On the other hand, the water supply pipe heat exchanger 70 can cool the drinking water in the water supply pipe 60 by the cold heat from the second medium. Adult chicken C2 has no sweat glands and is covered with feathers, so that the body temperature cannot be regulated by sweating, heat is not easily dissipated, and heat tends to be trapped in the body. For this reason, if there is a sudden rise in the outside air temperature, the body temperature cannot be adjusted and heat stroke may occur, leading to death. In addition, adult chicken C2 has the characteristic of drinking more water than other organisms. Therefore, the body temperature of the adult chicken C2 can be suitably adjusted by the adult chicken C2 drinking the drinking water cooled by the cold heat from the second medium. Therefore, it is possible to provide a suitable breeding environment for the adult chicken C2.

In this way, in the summer, the maintenance of the high temperature environment of the second poultry house 10B for breeding the young chicks C1 and the cooling of the drinking water of the first poultry house 10A for breeding the adult chicken C2 can be achieved at the same time, so that effective use of energy can be achieved. Can be planned.

Next, the case of winter will be described.

In winter, it is preferable to keep the inside of the poultry house 10 in a high temperature environment so that both the young chicks C1 and the adult chickens C2 can cope with a sudden decrease in the outside air temperature.

In winter, the switching valve 28 shown in FIG. 2 is switched to connect the first flow path 21a and the third flow path 21c so that only heat can be taken out from the heat pump 20. Therefore, the second medium circulating in the cooling path 40 is not cooled by the chilled water heat exchanger 25.

The heating path 30 can heat the inside of the poultry house 10 from under the floor of the poultry house 10. Therefore, it is possible to provide a suitable rearing environment for the young chicks C1 and the adult chickens C2.

In the middle season such as spring and autumn, the above-mentioned summer mode and winter mode are appropriately switched and used according to the temperature of the day.

As described above, the poultry farming system 1 according to the present embodiment includes two poultry houses 10 (10A, 10B) in which chickens are raised, and a heat pump 20 capable of simultaneously taking out cold and hot heat, and the heat pump 20. Takes in the waste heat generated from the first poultry house 10A and supplies it to the second poultry house 10B as heat. According to the chicken raising system 1 configured in this way, an electric heat pump 20 is used as a power source for heating without using a fossil fuel bleeder device or a boiler. Therefore, it is possible to suppress the emission of carbon dioxide. Further, since the waste heat generated from the first poultry house 10A is taken into the heat pump 20 and the heat is supplied to the second poultry house 10B, a higher COP can be realized.

The heat pump 20 includes a first flow path 21a, a second flow path 21b, and a third flow path 21c, and the second flow path 21b and the third flow path 21c are branched from the first flow path 21a and the first flow path. It is configured to join 21a and has a refrigerant flow path 21 through which a refrigerant circulates. Further, the heat pump 20 is provided in the first flow path 21a, and has a compressor 22 that compresses the refrigerant passing through the first flow path 21a to raise the temperature of the refrigerant and expands the refrigerant to lower the temperature of the refrigerant. It has an expansion valve 23 for making it. Further, the heat pump 20 is provided in the first flow path 21a, and is provided in the hot water heat exchanger 24 for heating the first medium by the refrigerant circulating from the compressor 22 toward the expansion valve 23, and in the second flow path 21b. It also has a chilled water heat exchanger 25 that cools the second medium with a refrigerant that circulates from the expansion valve 23 toward the compressor 22. Further, the heat pump 20 is provided in the third flow path 21c, and has an air heat exchanger 26 for cooling the air taken in from the outside by a refrigerant circulating from the expansion valve 23 toward the compressor 22, and an air heat exchanger 26. It has a discharge fan 27 for discharging the air cooled by the air to the outside, and a switching valve 28 for switching the supply of the refrigerant passing through the first flow path 21a to the second flow path 21b or the third flow path 21c.

According to the poultry farming system 1 configured as described above, the first medium circulating in the heating path 30 heats the poultry house 10, and the second medium circulating in the cooling path 40 cools the drinking water supplied to the livestock. .. Therefore, the heating of the poultry house 10 and the cooling of the drinking water can be switched according to the season. Therefore, it is possible to provide a suitable breeding environment for chickens.

Further, it further has a cleaning unit 50 for cleaning the fins of the air heat exchanger 26. According to the chicken raising system 1 configured in this way, dust adhering to the fins of the air heat exchanger 26 can be suitably removed, and the waste heat generated from the first chicken house 10A is removed from the air heat exchanger 26 of the heat pump 20. Can be suitably taken in.

In addition, adult chicken C2 is bred in the first poultry house 10A, and young chick C1 is bred in the second poultry house 10B. According to the poultry farming system 1 configured in this way, in the first poultry house 10A where the adult chicken C2 is bred, the calorific value of the adult chicken C2 is larger than the calorific value of the young chick C1, so that more waste heat is generated. It can be used. Further, since the young chick C1 is vulnerable to the cold with respect to the adult chicken C2, heat can be supplied to the young chick C1, so that a more efficient poultry farming system 1 can be provided.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.

For example, in the above-described embodiment, the system is applied to a poultry farming system for raising chickens as a livestock barn heating system, but it can also be applied to raising pigs and the like.

Further, in the above-described embodiment, the poultry house system has two poultry houses, but may have three or more poultry houses.

Further, in the above-described embodiment, the cleaning unit 50 cleans by injecting high-pressure air into the fins of the air heat exchanger 26, but the cleaning unit 50 is not limited to this, and high-pressure water is injected into the fins of the air heat exchanger 26. It may be configured to inject into.

1 Poultry farming system (livestock barn heating system),
10 poultry house,
10A 1st poultry house (1st poultry house),
10B 2nd poultry house (other poultry house),
20 heat pump,
21 Refrigerant flow path,
21a 1st flow path,
21b 2nd flow path,
21c 3rd channel,
22 Compressor,
23 Expansion valve,
24 Hot water heat exchanger,
25 Cold water heat exchanger,
26 Air heat exchanger,
27 Discharge fan,
28 switching valve,
30 heating path,
40 cooling path,
70 Water supply pipe heat exchanger,
C1 chicks,
C2 adult chicken.

Claims (5)

Multiple barns where livestock are raised and
With a heat pump, which can take out cold and hot heat at the same time,
The heat pump takes in waste heat from one of the livestock houses and supplies it to the other livestock house as the heat.
The heat pump
A first flow path, a second flow path, and a third flow path are provided, and the second flow path and the third flow path are configured to be branched from the first flow path and merged with the first flow path. At the same time, the refrigerant flow path through which the refrigerant circulates,
A compressor provided in the first flow path and compressing the refrigerant passing through the first flow path to raise the temperature of the refrigerant.
An expansion valve that expands the refrigerant and lowers the temperature of the refrigerant,
A hot water heat exchanger that heats the first medium by the refrigerant provided in the first flow path and circulating from the compressor toward the expansion valve.
A cold water heat exchanger provided in the second flow path and cooling the second medium with the refrigerant circulating from the expansion valve toward the compressor.
An air heat exchanger provided in the third flow path and using the refrigerant circulating from the expansion valve toward the compressor to cool the air having the waste heat taken in from the one livestock barn.
An exhaust fan that discharges the air cooled by the air heat exchanger to the outside,
A livestock house heating system having a switching valve for switching the supply of the refrigerant passing through the first flow path to the second flow path or the third flow path . The livestock barn heating system according to claim 1 , further comprising a cleaning unit for cleaning the fins of the air heat exchanger. The livestock barn heating system according to claim 1 or 2 , wherein adult chickens are bred in the one barn and young chicks are bred in the other barn. The livestock barn heating system according to any one of claims 1 to 3, wherein the waste heat generated from the livestock barn is taken out from the heat generated by a motor that rotates a ventilation fan. The livestock barn heating system according to any one of claims 1 to 4, wherein the waste heat generated from the livestock barn is taken out from the heat generated from the lamp.

Images