JP7374005B2 - ventilation system - Google Patents

Description

The present invention relates to a ventilation system that circulates air indoors.

In recent years, in the refrigerated warehouse industry, small and medium-sized enterprises that cannot afford to rebuild due to aging are withdrawing from the industry, and warehouses are being consolidated into new large warehouses operated by major manufacturers. As warehouses become larger, it becomes difficult to equalize the temperature within the warehouse, leading to temperature unevenness within the warehouse. Generally, the occurrence of temperature unevenness is responded to by lowering the set temperature of the air conditioner, so energy conservation of the air conditioner has become an issue.

As a measure to save energy, Patent Document 1 discloses a method of improving temperature unevenness by circulating cold air in a warehouse using a circulation flow.

Patent No. 6464772

However, according to the technology of Patent Document 1, a vertical circulation flow is formed in the warehouse, but since the cold air blown out from the air conditioner is circulated along the ceiling surface, it is difficult to use in large spaces. The cold air descends, the airflow is turbulent, and it is difficult to form a circulation flow. Therefore, there is currently no way to eliminate temperature unevenness while realizing energy savings in large spaces such as large warehouses.

The present invention has been made in view of the above, and an object of the present invention is to obtain a ventilation system that can realize energy saving in a large space and eliminate the occurrence of temperature unevenness.

In order to solve the above-mentioned problems and achieve the objects, a ventilation system according to the present invention is provided with an air conditioner that blows out conditioned air, is installed on the ceiling of a sealed space to be air conditioned, and is provided with a blower system that blows out conditioned air. A first airflow consisting of conditioned air blown out from a ceiling surface on the side of one end in the space to be air conditioned toward the side of the other end opposite to the one end in the space to be air conditioned. and a second air blowing section that horizontally blows a second airflow made of air inside the air conditioning target space from the other end side toward the one end side. The first blower unit includes an air conditioner that blows out cold air, and a first blower that directs the cold air blown out from the air conditioner from a ceiling surface on one end side to the other end side of the air conditioning target space. It has a duct that blows out horizontally along the surface, and a first blower that blows cold air blown out from the duct diagonally downward toward the other end. The first airflow is an airflow consisting of cold air. The first air blower is provided on the ceiling surface on the side of one end inside the air conditioning target space, and blows the first airflow diagonally downward toward the other end. The second blowing section is provided on the ceiling surface on the other end side inside the air conditioning target space, and blows the second air flow horizontally along the ceiling surface toward the one end side. The air blowing system forms a vertical circulation flow in the region between one end and the other end by means of the first air flow and the second air flow.

According to the present invention, it is possible to realize energy saving in a large space and eliminate the occurrence of temperature unevenness.

An image diagram of a horizontal cross section of a refrigerated warehouse in which the ventilation system according to Embodiment 1 of the present invention is installed An image diagram of a vertical cross section of a refrigerated warehouse in which a ventilation system according to Embodiment 1 of the present invention is arranged An image diagram of a vertical cross section of a warehouse in which a modified example of the ventilation system according to Embodiment 1 of the present invention is arranged A model diagram of a refrigerated warehouse for analyzing the effects of the ventilation system according to the first embodiment of the present invention Wind speed distribution diagram that is the airflow analysis result when there is no first blower and second blower in the model shown in Figure 4. Temperature distribution diagram that is the airflow analysis result when there is no first blower and second blower in the model in Figure 4 Airflow distribution diagram that is the airflow analysis result when the first blower and second blower are not included in the model shown in Figure 4. Wind speed distribution diagram which is the airflow analysis result of the model in Figure 4 Temperature distribution diagram that is the airflow analysis result of the model in Figure 4 Airflow distribution diagram that is the airflow analysis result of the model in Figure 4

EMBODIMENT OF THE INVENTION Below, the ventilation system concerning embodiment of this invention is demonstrated in detail based on drawing. Note that the present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is an image diagram of a horizontal cross section of a cold storage warehouse 1 in which a ventilation system 100 according to Embodiment 1 of the present invention is arranged. FIG. 2 is an image diagram of a vertical cross section of the refrigerated warehouse 1 in which the air blowing system 100 according to the first embodiment of the present invention is arranged. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 and 2 show a case where a ventilation system 100 according to the first embodiment is disposed within a cold storage warehouse 1 having a rectangular parallelepiped shape. In the cold storage 1 shown in FIGS. 1 and 2, the length in the longitudinal direction of the rectangular parallelepiped is the length L of the cold storage, the width of the rectangular parallelepiped is the width W of the cold storage, and the height of the rectangular parallelepiped is the length of the cold storage. Let the height be H. The internal space of the refrigerated warehouse 1 is an air-conditioned space that is sealed.

As shown in FIGS. 1 and 2, the internal space of the refrigerated warehouse 1 having a rectangular parallelepiped shape includes a floor surface 1a, a ceiling surface 1b, a first inner wall surface 1c, a second inner wall surface 1d, and a third inner wall surface 1c. It is surrounded by an inner wall surface 1e and a fourth inner wall surface 1f. The floor surface 1a and the ceiling surface 1b are provided in parallel. The first inner wall surface 1c and the second inner wall surface 1d are provided in parallel. The third inner wall surface 1e and the fourth inner wall surface 1f are provided in parallel. Therefore, the first inner wall surface 1c and the second inner wall surface 1d are a pair of inner wall surfaces that face each other inside the cold storage warehouse 1. Further, the third inner wall surface 1e and the fourth inner wall surface 1f are another pair of inner wall surfaces that face each other inside the cold storage warehouse 1.

As shown in FIGS. 1 and 2, an entrance/exit 2 is provided in a first inner wall surface 1c, which is the left inner wall surface of the refrigerated warehouse 1. As shown in FIGS. The entrance/exit 2 is provided in a region of the first inner wall surface 1c on the fourth inner wall surface 1f side. Therefore, with the entrance/exit 2 as a reference, the first inner wall surface 1c is the inner wall surface on the side where the entrance/exit 2 is provided in the direction of the length L of the cold storage warehouse. The second inner wall surface 1d is an inner wall surface on the side where the entrance/exit 2 is not provided in the direction of the length L of the cold storage warehouse, which faces the first inner wall surface 1c where the entrance/exit 2 is provided.

The third inner wall surface 1e is an inner wall surface that connects the side of the first inner wall surface 1c on the side where the entrance 2 is not provided in the direction of the width W of the refrigerated warehouse and the second inner wall surface 1d. 2 is the inner wall surface where no part is provided. The fourth inner wall surface 1f is an inner wall surface that connects the side of the first inner wall surface 1c on the side where the entrance/exit 2 is provided in the direction of the width W of the refrigerated warehouse and the second inner wall surface 1d.

As shown in FIG. 1, in the internal space of the refrigerated warehouse 1, a first loading shelf 3a, which is a loading shelf 3 extending in the direction of the length L of the refrigerated warehouse, has a back surface facing a third inner wall surface 1e. placed in contact. Further, in the internal space of the refrigerated warehouse 1, a fourth shelf 3d extending in the direction of the length L of the refrigerated warehouse is arranged with its back surface in contact with the fourth inner wall surface 1f. Further, in the internal space of the refrigerated warehouse 1, a second loading shelf 3b and a third loading shelf 3c, which are loading shelves 3 extending in the direction of the length L of the cold storage warehouse, are arranged. The second shelf 3b and the third shelf 3c are arranged in parallel between the third inner wall surface 1e and the fourth inner wall surface 1f in this order from the third inner wall surface 1e side. ing.

The space between the first shelf 3a and the second shelf 3b is a first passage 4a. The space between the second shelf 3b and the third shelf 3c is a second passage 4b. The space between the third shelf 3c and the fourth shelf 3d is a third passage 4c. The extending direction of the first passage 4a, the second passage 4b, and the third passage 4c is a direction parallel to the direction of the length L of the refrigerated warehouse.

In the cold storage warehouse 1, the indoor unit 11 of the air conditioner 10 is arranged on the floor surface 1a at the corner where the first inner wall surface 1c and the third inner wall surface 1e are connected. The air conditioner 10 includes an indoor unit 11 and an outdoor unit (not shown). Note that an integrated air conditioner may be placed at the position of the indoor unit 11. A duct 13 that is a wind conduit that serves as a passage for air blown out from the indoor unit 11 is attached to the upper part of the indoor unit 11 .

Based on the indoor unit 11, the first inner wall surface 1c is the inner wall surface on the side where the indoor unit 11 is provided in the direction of the length L of the refrigerated warehouse. The second inner wall surface 1d is an inner wall surface on the side where the indoor unit 11 is not provided in the direction of the length L of the refrigerated warehouse, which faces the first inner wall surface 1c where the indoor unit 11 is provided.

The duct 13 has a vertical portion 131 that is routed vertically upward from the indoor unit 11 to the ceiling surface 1b along the third inner wall surface 1e, and further extends from the ceiling surface 1b above the indoor unit 11 along the ceiling surface 1b. It has a horizontal portion 132 that is horizontally routed from the vertical portion 131 toward the fourth inner wall surface 1f.

In addition, the duct 13 is an air outlet that is branched along the ceiling surface 1b from a horizontal portion 132 at a position corresponding to the first passage 4a toward the second inner wall surface 1d in the in-plane direction of the ceiling surface 1b. It has a first balloon part 13a which is a part. The tip position of the first blowing portion 13a is the end position of the first passage 4a on the first inner wall surface 1c side.

In addition, the duct 13 is a blowout provided by branching along the ceiling surface 1b from a horizontal portion 132 at a position corresponding to the second passage 4b toward the second inner wall surface 1d in the in-plane direction of the ceiling surface 1b. It has a second balloon part 13b which is a part. The tip position of the second blowing portion 13b is the end position of the second passage 4b on the first inner wall surface 1c side.

Further, the duct 13 is an air outlet that is branched along the ceiling surface 1b from a horizontal portion 132 at a position corresponding to the third passage 4c toward the second inner wall surface 1d in the in-plane direction of the ceiling surface 1b. It has a third balloon part 13c which is a part. The tip position of the third blowing portion 13c is the end position of the third passage 4c on the first inner wall surface 1c side.

The duct 13 blows out cold air, which is conditioned air, blown from the indoor unit 11 to the vertical section 131 from its tip along the length L direction of the cold storage warehouse. That is, the first blowing section 13a blows out conditioned air into the first passage 4a toward the second inner wall surface 1d along the ceiling surface 1b. The second blowing section 13b blows out conditioned air into the second passage 4b toward the second inner wall surface 1d along the ceiling surface 1b. The third blowing section 13c blows out conditioned air toward the second inner wall surface 1d and into the third passage 4c along the ceiling surface 1b. The blowing direction of the conditioned air from the first blowing part 13a, the second blowing part 13b, and the third blowing part 13c, which are blowing parts, is a direction parallel to the direction of the length L of the refrigerated warehouse.

In the refrigerated warehouse 1, a first blower 21 is arranged in front of a blowing section on the ceiling surface 1b in the blowing direction of conditioned air from the duct 13. That is, on the ceiling surface 1b above the first passage 4a, a first air outlet is provided at a predetermined distance from the first air outlet part 13a in the direction in which conditioned air is blown out from the first air outlet part 13a. A blower 21a is arranged. A first air blower is installed on the ceiling surface 1b above the second passage 4b at a predetermined distance from the second air outlet 13b in the direction in which conditioned air is blown out from the second air outlet 13b. 21b is arranged. A first air blower is installed on the ceiling surface 1b above the third passage 4c at a predetermined distance from the third air outlet 13c in the direction in which conditioned air is blown out from the third air outlet 13c. 21c is arranged.

In the cold storage warehouse 1, a second blower 22 is arranged in front of the first blower 21 in the direction in which conditioned air is blown out from the duct 13 on the ceiling surface 1b. The second blower 22 is arranged on the ceiling surface 1b in a region adjacent to the second inner wall surface 1d, which is the inner wall surface on the side where the indoor unit 11 is not provided, in the blowing direction of conditioned air from the duct 13. There is.

That is, on the ceiling surface 1b above the first passage 4a, a predetermined distance from the first blower 21a is provided in front of the first blower 21a in the direction in which conditioned air is blown out from the first blower part 13a. A second blower 22a is arranged at a distance. A predetermined distance from the first blower 21b is provided on the ceiling surface 1b above the second passage 4b in front of the first blower 21b in the direction in which conditioned air is blown out from the second blowout part 13b. A second blower 22b is placed in a space. A predetermined distance from the first blower 21c is provided on the ceiling surface 1b above the third passage 4c in front of the first blower 21c in the direction in which the conditioned air is blown out from the third blowout part 13c. A second blower 22c is placed in a space.

The above-mentioned ventilation system 100 is installed on the ceiling surface 1b of the internal space of the refrigerated warehouse 1, which is a sealed air-conditioned space, and directs a first airflow of conditioned air to one end of the air-conditioned space. A first blowing section is provided that blows air from the ceiling surface 1b toward the other end opposite to the one end inside the air-conditioned space. Further, the above-mentioned ventilation system 100 includes a second ventilation section that horizontally blows a second airflow made of air inside the air conditioning target space from the other end side toward the one end side. . The above-described air blowing system 100 forms a vertical circulation flow 31 in a region between one end and the other end using the first airflow and the second airflow. One end portion is, for example, the first inner wall surface 1c. The other end is, for example, the second inner wall surface 1d. The first blower section includes an air conditioner 10, a duct 13, and a first blower 21. The second blower section is constituted by a second blower 22.

Hereinafter, with reference to FIGS. 1 and 2, the circulation of air in the third passage 4c by the above-described air blowing system 100 will be described. The indoor unit 11 blows out cold air, which is conditioned air, to the vertical portion 131 of the duct 13. The cold air blown to the vertical part 131 passes through the horizontal part 132 and is blown out from the third blowing part 13c. The third blowing section 13c blows out cold air toward the second inner wall surface 1d and into the third passage 4c along the ceiling surface 1b.

The cold air blown out from the third blowing portion 13c is blown obliquely downward toward the second inner wall surface 1d by the first blower 21c. The cold airflow 32 blown by the first blower 21c is the first airflow in the ventilation system 100. Thereby, the airflow 32 of cold air is blown to the floor surface 1a of the third passage 4c in front of the first blower 21c in the direction of blowing out the conditioned air from the third blowing portion 13c.

The cold air flow 32 blown to the floor surface 1a of the third passage 4c descends because the temperature is relatively lower than the surrounding temperature, and moves toward the second inner wall surface 1d along the floor surface 1a due to the Coanda effect. flowing towards. On the other hand, the air inside the refrigerated warehouse 1 is relatively warm with respect to the cold air flow 32 blown from the indoor unit 11 to the floor surface 1a. For this reason, the air near the second inner wall surface 1d, which has a relatively high temperature with respect to the cold airflow 32 blown from the indoor unit 11 to the floor surface 1a, rises and becomes an upward airflow 31a, causing the ceiling surface to It rises towards 1b.

On the other hand, the second blower 22c blows the air inside the refrigerated warehouse 1 horizontally along the ceiling surface 1b toward the first inner wall surface 1c. The airflow 33 of air blown by the second blower 22c is the second airflow in the ventilation system 100.

The airflow 33 blown by the second blower 22c flows along the ceiling surface 1b due to the Coanda effect while drawing in the upward airflow 31a, is drawn into the cold airflow 32, becomes a downward airflow 31b, and becomes a downward airflow 31a on the floor surface 1a. descend towards.

As a result, a vertical circulation flow 31 is formed within the third passage 4c. As described above, the vertical circulation flow 31 can be formed by the natural convection effect in which cold air descends and warm air rises, and the Coanda effect by causing the airflow to follow the floor surface 1a or the ceiling surface 1b. The first airflow 32 of cold air is an airflow for forming an upward airflow 31a that rises inside the air conditioning target space. Moreover, the airflow 33, which is the second airflow, is an airflow for forming a descending airflow 31b that descends inside the air conditioning target space.

By forming the vertical circulation flow 31 in the third passage 4c, air circulates in the length L direction of the refrigerated warehouse and the height H direction of the refrigerated warehouse within the third passage 4c, The occurrence of temperature unevenness in the space along the third passage 4c in the internal space of the cold storage warehouse 1 is improved.

In addition, in the above-mentioned ventilation system 100, the floor surface 1a is aligned from the first inner wall surface 1c side where the entrance/exit 2 is provided toward the second inner wall surface 1d side where the entrance/exit 2 is not provided. A vertical circulation flow 31 is formed by passing a cold air flow 32. That is, in the ventilation system 100, the vertical circulation flow 31 is formed without forming the airflow of cold air heading toward the inlet/outlet 2. This prevents cold air from flowing from the inside of the cold storage warehouse 1 through the doorway 2 to the outside of the cold storage warehouse 1 when the doorway 2 is opened, and from the outside of the cold storage warehouse 1 through the doorway 2 to the inside of the cold storage warehouse 1. It is possible to prevent warm air from flowing into the refrigerated warehouse 1, and to prevent a rise in temperature within the refrigerated warehouse 1.

If the blowing direction of the cold air from the first blower 21c is directed toward the entrance/exit 2, when the entrance/exit 2 opens, the cold air flowing along the floor 1a will directly flow from the entrance/exit 2 to the outside of the refrigerated warehouse 1. This accelerates the flow of warm air into the refrigerated warehouse 1 from the entrance 2, causing the inside of the refrigerated warehouse 1 to become warm.

Further, in the blower system 100, the third blower 13c, the first blower 21c, and the second blower 22c are arranged on the third passage 4c, which is free from obstacles in the in-plane direction of the ceiling surface 1b. . As a result, in the ventilation system 100, the vertical circulation flow 31 is formed in the third passage 4c where there are no obstacles, so that the occurrence of temperature unevenness inside the refrigerated warehouse 1 caused by the obstacles is improved.

Furthermore, in the blower system 100, the first blower 21c supports the physical phenomenon in which cold air naturally falls, and forces the cold air to fall in a planned manner. This improves the occurrence of temperature unevenness inside the refrigerated warehouse 1 due to the natural fall of cold air.

Further, in the ventilation system 100, the same effect as that of the third passage 4c is obtained in the first passage 4a and the second passage 4b, and the occurrence of temperature unevenness inside the cold storage warehouse 1 is improved as a whole. Ru.

Further, the blowing direction of the first blower 21 and the second blower 22 may be adjustable in the in-plane direction of the ceiling surface 1b. As a result, the degree of freedom in the air blowing direction of the first blower 21 and the second blower 22 in the cold storage warehouse 1 increases, and the first blower 21 and the second blower 22 move in the direction along the longitudinal direction of the cold storage warehouse 1. It is possible to form a vertical circulation flow 31 by blowing air in a direction inclined from the vertical direction.

FIG. 3 is an image diagram of a vertical cross section of a warehouse in which a modified example of the ventilation system 100 according to the first embodiment of the present invention is arranged. FIG. 3 is a diagram corresponding to FIG. 2. FIG. 3 shows a case where the warehouse in which the modified example of the ventilation system 100 is placed is a constant temperature warehouse. In addition, for ease of understanding, the constant temperature warehouse in FIG. 3 is given the same reference numeral as the refrigerated warehouse 1 described above.

The modified example of the blower system 100 differs from the structure of the blower system 100 in that the first blower 21 is not provided and the second blower 22 is placed on the floor 1a. In a modified example of the blower system 100, the second blower 22 is arranged on the floor surface 1a in a region adjacent to the second inner wall surface 1d, which is the inner wall surface on the side where the indoor unit 11 is not provided.

That is, on the floor surface 1a of the first passage 4a, there is a space in front of the first air outlet part 13a in the blowing direction of conditioned air from the first air outlet part 13a at a predetermined distance from the first air outlet part 13a. A second blower 22a is arranged at a distance. The floor surface 1a of the second passage 4b is provided with a predetermined distance in front of the second air outlet part 13b in the blowing direction of conditioned air from the second air outlet part 13b. A second blower 22b is placed in a space. The floor surface 1a of the third passage 4c is provided with a predetermined distance in front of the third air outlet part 13c in the direction in which conditioned air is blown out from the third air outlet part 13c. A second blower 22c is placed in a space.

Hereinafter, with reference to FIGS. 1 and 3, circulation of air in the third passage 4c according to a modification of the above-described air blowing system 100 will be described. The indoor unit 11 blows warm air, which is conditioned air, into the vertical portion 131 of the duct 13. The warm air blown into the vertical portion 131 passes through the horizontal portion 132 and is blown out from the third blowing portion 13c. The third blowing section 13c blows out warm air toward the second inner wall surface 1d and into the third passage 4c along the ceiling surface 1b.

The airflow 35 of warm air blown out from the third blowing section 13c is the first airflow in the modified example of the ventilation system 100. The warm air current 35 blown out from the third blowing portion 13c flows along the ceiling surface 1b toward the second inner wall surface 1d due to the Coanda effect. On the other hand, the air inside the refrigerated warehouse 1 is relatively cold with respect to the warm air flow 35 blown out from the third blowing section 13c. Therefore, the air near the second inner wall surface 1d, which has a relatively low temperature with respect to the warm air flow 35 blown out from the third blowout part 13c, descends and becomes a downward airflow 34a, forming a downward airflow 34a on the floor surface 1a. descend towards. In addition, a part of the warm air current 35 blown out from the third blowing portion 13c is caught up in the descending air current 34a, becomes a descending air current 34a, and descends toward the floor surface 1a.

On the other hand, the second blower 22c blows the air inside the constant temperature warehouse 1 horizontally along the floor surface 1a toward the first inner wall surface 1c. The airflow 36 of air blown by the second blower 22c is a second airflow in the modified example of the ventilation system 100.

The airflow 36 blown by the second blower 22c flows along the floor surface 1a due to the Coanda effect while drawing in the downward airflow 34a. The downdraft 34a entrains a part of the warm air 35 blown out from the third blowout part 13c, so that it is relatively warm compared to the air near the floor surface 1a. Therefore, the air in the airflow 36 of the blown air by drawing in the descending airflow 34a, which has a relatively high temperature compared to the air near the floor surface 1a, rises and becomes an upward airflow 34b toward the ceiling surface 1b. Rise.

As a result, a vertical circulation flow 34 is formed within the third passage 4c. As described above, the vertical circulation flow 34 can be formed by the natural convection effect in which cold air descends and warm air rises, and the Coanda effect by causing the airflow to follow the floor surface 1a or the ceiling surface 1b. The warm air airflow 35, which is the first airflow, is an airflow for forming a descending airflow 34a that descends inside the air conditioning target space. Moreover, the airflow 36, which is the second airflow, is an airflow for forming an upward airflow 34b that rises inside the air conditioning target space.

By forming the vertical circulation flow 34 in the third passage 4c, air circulates in the length L direction of the constant temperature warehouse and the height H direction of the constant temperature warehouse within the third passage 4c, The occurrence of temperature unevenness in the space along the third passage 4c in the internal space of the constant temperature warehouse 1 is improved.

Moreover, in the modification of the ventilation system 100 described above, the ceiling surface 1b A vertical circulation flow 34 is formed by flowing a warm air flow 35 along the vertical circulation flow 34. That is, in the modified example of the ventilation system 100, the vertical circulation flow 34 is formed without forming the airflow of warm air toward the inlet/outlet 2. As a result, when the entrance/exit 2 is opened in winter, for example, warm air can flow from the inside of the constant temperature warehouse 1 through the entrance 2 to the outside of the constant temperature warehouse 1, and from the outside of the constant temperature warehouse 1 through the entrance/exit 2. It is possible to prevent cold air from flowing into the inside of the warehouse 1, and a drop in temperature inside the constant temperature warehouse 1 can be prevented.

If the blowing direction of the warm air from the third blowing part 13c is directed toward the doorway 2, for example, when the doorway 2 is opened in winter, the warm air flowing along the floor surface 1a will be directly heated from the doorway 2 at a constant temperature. The cold air flows out of the warehouse 1, accelerating the flow of cold air into the temperature-controlled warehouse 1 through the entrance 2, and the temperature-controlled warehouse 1 becomes cold.

Furthermore, in the modified example of the air blowing system 100, the third blowing portion 13c and the second air blower 22c are arranged on a third path 4c free of obstacles in the in-plane direction of the ceiling surface 1b. As a result, in the modified example of the ventilation system 100, the vertical circulation flow 34 is formed in the third passage 4c where there is no obstruction, so that the occurrence of temperature unevenness inside the constant temperature warehouse 1 caused by the obstruction is improved. .

In addition, in the modified example of the ventilation system 100, the same effect as that of the third passage 4c can be obtained in the first passage 4a and the second passage 4b, and as a whole, the occurrence of temperature unevenness inside the constant temperature warehouse 1 is reduced. is improved.

As described above, the air blowing system 100 can form the vertical circulation flow 31 using passages, so it can reliably circulate the air inside the cold storage warehouse 1 in a large space with obstacles such as storage shelves. As a result, the occurrence of temperature unevenness inside the refrigerated warehouse 1 can be improved. In the ventilation system 100, it is easy to form the vertical circulation flow 31 even in a large space where the distance between the inner wall surfaces is long. Moreover, the air blowing system 100 can suppress the power consumption of the blower of the air blowing system 100 by efficiently utilizing the natural convection effect of cooled and heated air.

In addition, since the ventilation system 100 can improve the occurrence of temperature unevenness inside the cold storage warehouse 1 by the vertical circulation flow 31, the set temperature of the air conditioner 10 can be adjusted to improve the occurrence of temperature unevenness inside the cold storage warehouse 1. There is no need to lower the temperature more than necessary, and energy saving of the air conditioner 10 can be realized by relaxing the set temperature of the air conditioner 10.

In addition, since the ventilation system 100 can improve the occurrence of temperature unevenness inside the cold storage warehouse 1 by the vertical circulation flow 31, large-scale equipment etc. are not required inside the cold storage warehouse 1, and the stored items inside the cold storage warehouse 1 can be improved. It is possible to reduce the risk of temperature damage and expand the storage space inside the cold storage warehouse 1.

Therefore, according to the air blowing system 100, an air blowing system that can realize energy saving in a large space and eliminate the occurrence of temperature unevenness can be obtained.

Moreover, the same effects as the ventilation system 100 can be obtained also in the modification of the ventilation system 100 described above.

FIG. 4 is a model diagram of refrigerated warehouse 50 for analyzing the effects of air blowing system 100 according to Embodiment 1 of the present invention. FIG. 4 is a model diagram simulating the first passage 4a in FIG. 1, and the same members as in FIG. 1 are given the same reference numerals as in FIG. 1. The model diagram in FIG. 4 shows a state in which the ceiling and side surfaces of the cold storage warehouse 50 are seen through.

In the model diagram of FIG. 4, a duct 13 is connected to an indoor unit 11 placed at a corner of a cold storage warehouse 50, and cold air is delivered to the inner wall surface on the opposite side of the cold storage warehouse 50 from the side where the indoor unit 11 is placed in the longitudinal direction. The first blowing part 13a of the duct 13 is extended to about 1/3 of the first passage 4a so that the first passage 4a can be reached. A first shelf 3a and a second shelf 3b are arranged up to the ceiling on both sides of the first passage 4a, and store items therein.

The first blowout section 13a of the duct 13 is provided with blowout openings 133 at four locations to suppress the occurrence of temperature unevenness on the indoor unit 11 side. In the refrigerated warehouse 50, an inner wall in the longitudinal direction of the refrigerated warehouse 50 opposite to the inner wall on which the indoor unit 11 is disposed is located diagonally below the area near the upstream outlet opening 133 of the first outlet portion 13a. A first blower 211 is arranged that can blow air down towards the target. In the cold storage warehouse 50, air is blown in a region in front of the end of the first blowing portion 13a of the duct 13 toward an inner wall in the longitudinal direction of the cold storage warehouse 50 opposite to the inner wall where the indoor unit 11 is disposed. A first blower 212 is arranged, which can be lowered.

In the refrigerated warehouse 50, on the ceiling surface of the inner wall opposite to the inner wall where the indoor unit 11 is arranged in the longitudinal direction of the refrigerated warehouse 50, there is a wall along the ceiling horizontally in the direction of the indoor unit 11 in the longitudinal direction of the refrigerated warehouse 50. A second blower 22 is arranged that can blow an airflow so as to cause the air to flow.

Airflow analysis of the cold storage warehouse 50 was performed using the model diagram of FIG. The conditions for the analysis are that the volume of the cold storage 50 is: length L of the cold storage: 50 m x width W of the cold storage: 10 m x height H of the cold storage: 5.5 m. In addition, outside temperature: 32°C, temperature of conditioned air blown from the indoor unit 11: -30°C, air volume blown from the tip of the first blowing part 13a: 2500 m ³ /h x 1 outlet, blowing opening of the indoor unit 11 Air volume blown from section 133: 1200 m ³ /h x 4 ports; Air volume of first blower 211, first blower 212 and second blower 22: 1970 m ³ /h x 3 units; Wall surface heat transmission coefficient: 0.21 W/m ² ·k.

FIG. 5 is a wind speed distribution diagram that is an airflow analysis result when the first blower 211, the first blower 212, and the second blower 22 are not provided in the model shown in FIG. FIG. 6 is a temperature distribution diagram that is an airflow analysis result when the first blower 211, the first blower 212, and the second blower 22 are not provided in the model shown in FIG. 5 and 6 show analysis results in a longitudinal section along the broken line 40 in the model of FIG. FIG. 7 is an airflow distribution diagram that is an airflow analysis result when the first blower 211, the first blower 212, and the second blower 22 are not provided in the model shown in FIG. FIG. 7 shows the analysis results of the horizontal section of the model shown in FIG. 4 at a height of 5.3 m.

FIG. 8 is a wind speed distribution diagram that is the result of airflow analysis of the model shown in FIG. FIG. 8 is a diagram corresponding to FIG. 5. FIG. 9 is a temperature distribution diagram that is the result of airflow analysis of the model shown in FIG. FIG. 9 is a diagram corresponding to FIG. 6. 8 and 9 show the analysis results in a longitudinal section along the broken line 40 in the model of FIG. 4. FIG. 10 is an airflow distribution diagram that is the result of airflow analysis of the model shown in FIG. FIG. 10 shows the analysis results of the horizontal section of the model shown in FIG. 4 at a height of 5.3 m. FIG. 10 is a diagram corresponding to FIG. 7.

From FIGS. 5, 6, and 7, if the first blower 211, the first blower 212, and the second blower 22 are not provided in the model of FIG. However, it can be seen that the inner wall in the longitudinal direction of the refrigerated warehouse 50 does not reach the inner wall opposite to the inner wall where the indoor unit 11 is arranged. In addition, from FIG. 6, it can be seen that a heat accumulation spot has occurred in a region 51 of the ceiling surface on the inner wall side opposite to the inner wall where the indoor unit 11 is arranged in the longitudinal direction of the refrigerated warehouse 50, and that It can be seen that cold air is trapped in a region 52 of the floor surface on the inner wall side opposite to the inner wall where the indoor unit 11 is disposed in the longitudinal direction.

On the other hand, from FIG. 8, FIG. 9, and FIG. It can be seen that the cold air blown out from the tip of the blowing part 13a reaches the inner wall of the refrigerated warehouse 50 on the opposite side from the inner wall where the indoor unit 11 is arranged in the longitudinal direction. Moreover, from FIG. 9, it can be seen that the heat accumulation in the region 51 and the cold air accumulation in the region 52 have been improved. Moreover, from FIG. 10, the airflow near the ceiling is formed from the opposite direction to the inner wall surface on the side where the indoor unit 11 is arranged in the longitudinal direction of the cold storage warehouse 50 toward the indoor unit 11 side, and the airflow is A trend was also confirmed in which the return air, which has a higher temperature than the airflow, was placed along the ceiling surface. From the above, it was confirmed that the air blowing system 100 can improve the occurrence of temperature unevenness in air conditioning in a large space.

As described above, the ventilation system 100 generates the vertical circulation flow 31 using the temperature difference of the air in the air-conditioned space and the wall surface surrounding the air-conditioned space. It promotes circulation, and is useful not only for circulation in refrigerated warehouses but also in air conditioning for commercial use.

The configurations shown in the embodiments described above are examples of the contents of the present invention, and can be combined with other known techniques, and the configurations can be modified without departing from the gist of the present invention. It is also possible to omit or change parts.

1,50 cold storage, 1a floor, 1b ceiling, 1c first inner wall, 1d second inner wall, 1e third inner wall, 1f fourth inner wall, 2 entrance, 3a first cargo shelf, 3b second shelf, 3c third shelf, 3d fourth shelf, 4a first passage, 4b second passage, 4c third passage, 10 air conditioner, 11 indoor unit, 13 Duct, 13a First blowing part, 13b Second blowing part, 13c Third blowing part, 21, 21a, 21b, 21c, 211, 212 First blower, 22, 22a, 22b, 22c Second blowing part Blower, 31, 34 vertical circulation flow, 31a, 34b updraft, 31b, 34a downdraft, 32 cold air flow, 33, 36 air flow, 35 warm air flow, 40 broken line, 51, 52 area, 100 ventilation system, 131 Vertical section, 132 Horizontal section, 133 Air outlet opening.

Claims (9)

An air conditioner that blows out conditioned air is provided on the ceiling surface of a sealed air-conditioned space, and a first airflow made of the conditioned air blown out from the air conditioner is directed to one end of the air-conditioned space. a first air blowing unit that blows air from a ceiling surface on the side toward the other end opposite to the one end inside the air conditioning target space;
a second air blowing unit that horizontally blows a second airflow made of air inside the air conditioning target space from the other end side toward the one end side;
Equipped with
The first air blowing section is
the air conditioner blowing out cold air;
a duct that blows out the cold air blown from the air conditioner horizontally from the ceiling surface on the one end side in the air conditioning target space toward the other end side; ,
a first blower that blows the cold air blown out from the duct diagonally downward toward the other end;
has
The first airflow is an airflow consisting of cold air,
The first air blower is provided on a ceiling surface on the one end side of the air conditioning target space, and blows the first airflow diagonally downward toward the other end side,
The second air blower is provided on a ceiling surface on the other end side of the air-conditioning target space, and causes the second airflow to flow horizontally along the ceiling surface toward the one end side. blow the air,
forming a vertical circulating flow in a region between the one end and the other end by the first airflow and the second airflow;
A ventilation system featuring The one end portion is a first inner wall surface in the air conditioning target space,
The other end portion is a second inner wall surface facing the first inner wall surface in the air conditioning target space;
The ventilation system according to claim 1 , characterized by: the first inner wall surface is an inner wall surface of the air-conditioned space in which an entrance and exit of the air-conditioned space is provided;
The ventilation system according to claim 2 , characterized in that: An air conditioner that blows out conditioned air is provided on the ceiling surface of a sealed air-conditioned space, and a first airflow made of the conditioned air blown out from the air conditioner is directed to one end of the air-conditioned space. a first air blowing unit that blows air from a ceiling surface on the side toward the other end opposite to the one end inside the air conditioning target space;
a second air blowing unit that horizontally blows a second airflow made of air inside the air conditioning target space from the other end side toward the one end side;
Equipped with
The first airflow is an airflow consisting of warm air,
The first air blower is provided on a ceiling surface on the one end side in the air conditioning target space, and the first airflow is horizontally directed along the ceiling surface toward the other end side. blow the air,
The second air blower is provided on a floor surface on the other end side of the air-conditioning target space, and the second air blower is configured to direct the second airflow horizontally along the floor surface toward the one end side. blow the air,
forming a vertical circulating flow in a region between the one end and the other end by the first airflow and the second airflow;
A ventilation system featuring The first air blowing section is
an air conditioner that blows out the warm air;
a duct that blows the warm air blown out from the air conditioner horizontally from the ceiling surface on the one end side in the air conditioning target space toward the other end side; ,
The ventilation system according to claim 4 , characterized in that it has: The one end portion is a first inner wall surface in the air conditioning target space,
The other end portion is a second inner wall surface facing the first inner wall surface in the air conditioning target space;
The ventilation system according to claim 4 or 5 , characterized by: the first inner wall surface is an inner wall surface of the air-conditioned space in which an entrance and exit of the air-conditioned space is provided;
The ventilation system according to claim 6 , characterized in that: The first air blower and the second air blower are arranged on a passageway in an in-plane direction of the ceiling surface,
The passageway is a space between obstacles arranged in the air conditioning target space;
The ventilation system according to any one of claims 1 to 7 , characterized in that: The first air blower and the second air blower have adjustable air blowing directions in an in-plane direction of the ceiling surface;
The ventilation system according to any one of claims 1 to 8 , characterized in that:

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