JP2011033258A - Displacement ventilation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a displacement ventilation system capable of saving a space of a room forming an air conditioning space as a target of displacement ventilation. <P>SOLUTION: In the displacement ventilation system 1, low temperature air having a temperature lower than that within the air conditioning space 2 is supplied to the air conditioning space 2 surrounded by a floor plate 4, a sidewall 6 and a ceiling plate 10 arranged to be separated from a building frame ceiling 8 downwardly, and high temperature air having a temperature higher than that of the low temperature air is lifted within the air conditioning space 2 and is discharged to outside of the air conditioning space 2, so as to ventilate inside of the air conditioning space 2. The displacement ventilation system 1 includes: an air supply port 16 for supplying the low temperature air to inside of the air conditioning space 2; and a main air discharge port 18 for discharging the high temperature air to outside of the air conditioning space 2. The air supply port 16 is opened on the lower face opposing to the floor plate 4 in a hanging part 28 positioned above a lower end of an air exhaust hood 32, formed of an air supply chamber 26 protruded from the ceiling plate 10 downwardly and hung from the ceiling plate 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention ventilates an air-conditioned space where heated high-temperature air such as a kitchen, air containing fat and oil components, air containing water vapor, air containing odor components, and the like are present. , Regarding replacement ventilation system.

Conventionally, as a system that ventilates air-conditioning spaces that contain high-temperature air and oil mist (air / oil smoke containing fat and oil components) generated by cooking, such as commercial electric kitchens, using the replacement ventilation method For example, there is a replacement ventilation system described in Patent Document 1.
In the replacement ventilation system described in Patent Document 1, an exhaust port for exhausting air in the air-conditioned space is provided above the center in the height direction of the side wall in the side wall of the room forming the air-conditioned space. In addition, an air supply port for supplying low-temperature air lower than the temperature in the air-conditioned space to the air-conditioned space below the center in the height direction of the side wall in the side wall of the room forming the air-conditioned space. Provided. In many cases, the air supply opening is open to an air supply chamber to which low-temperature air produced by taking outside air into an air conditioner or the like is supplied.

In such a replacement ventilation system, by supplying low-temperature air from the air supply port to the lower side of the air-conditioned space, high-temperature air that has been heated in the air-conditioned space and has risen in temperature is higher than the low-temperature air. It is possible to perform replacement ventilation in which the high-temperature air thus moved is exhausted from the exhaust port to ventilate the air-conditioned space.
For this reason, it is possible to efficiently ventilate the air-conditioned space with a small air volume, to reduce the ventilation amount and energy required for ventilation, and to make the thermal / air environment in the air-conditioned space in a good state. It becomes possible.

JP 2002-372268 A

As described above, in the replacement ventilation system described in Patent Document 1, the air supply port for supplying low-temperature air into the air-conditioned space is provided in the side wall of the room that opens the air supply chamber and forms the air-conditioned space. There are many cases.
However, when a replacement ventilation system is to be constructed by remodeling, etc. for a building that does not have a replacement ventilation system at the time of construction, it is necessary to place an air supply chamber, an air conditioner, etc. inside the room that forms the air-conditioned space. There are many cases.

Even if the air conditioner is installed in a room other than the room that forms the air-conditioned space, such as an air-conditioning room, and the air conditioner and the air supply chamber are connected by the air supply duct, the air supply chamber and the air supply duct are not connected. In many cases, it is necessary to arrange the air-conditioning space inside the room.
For this reason, there may be a problem that the work space of the room forming the air-conditioned space is reduced by the air supply chamber, the air conditioner, the air supply duct, and the like.
This invention is made paying attention to the above problems, and it aims at providing the replacement ventilation system which can save the space of the room which forms the air-conditioning space used as the object of replacement ventilation. .

In order to solve the above-mentioned problems, the invention described in claim 1 of the present invention is in an air-conditioned space surrounded by a floor plate, a side wall, and a ceiling plate arranged to be spaced downward from the housing ceiling. Replacement of supplying low-temperature air lower than the temperature in the air-conditioned space, raising the high-temperature air higher than the low-temperature air in the air-conditioned space and exhausting the air-conditioned space to ventilate the air-conditioned space A ventilation system,
An air supply port for supplying the low-temperature air into the air-conditioned space, and a main exhaust port for exhausting the high-temperature air to the outside of the air-conditioned space,
The air supply opening is open to a hanging part that hangs down from the ceiling plate.

According to the present invention, the air supply port that supplies the low-temperature air lower than the temperature in the air-conditioned space into the air-conditioned space surrounded by the floor plate, the side wall, and the ceiling plate arranged to be spaced downward from the housing ceiling. Open to the drooping part that hangs down from the ceiling plate.
For this reason, it becomes possible to arrange | position the air conditioner etc. for making low temperature air in the space formed between a frame ceiling and a ceiling board.
In addition, compared to the case where the air supply opening is opened on the ceiling surface, it is possible to suppress the attraction and diffusion of air in the upper part of the air-conditioned space, and the ventilation state in the air-conditioned space is prevented from becoming mixed ventilation. Therefore, it becomes possible to stably perform replacement ventilation in the air-conditioned space.

Next, of the present invention, the invention described in claim 2 is the invention described in claim 1, wherein the main exhaust port projects from the ceiling plate to the floor plate and is between the floor plate. Surrounded by an exhaust hood that forms a space,
The ceiling board is provided with a secondary exhaust opening that opens at a position between the air supply opening and the exhaust hood and exhausts the high-temperature air to the outside of the air-conditioned space.
According to the present invention, the secondary exhaust port that exhausts the high-temperature air out of the air-conditioned space is opened at a position between the exhaust hood that covers the periphery of the main exhaust port and the air supply port.
For this reason, it is possible to exhaust the high-temperature air that has not moved from the main exhaust port to the outside of the air-conditioned space but has moved toward the outside of the exhaust hood and has risen toward the ceiling plate to the outside of the air-conditioned space.

Next, of the present invention, the invention described in claim 3 is the invention described in claim 2, wherein the ratio of the exhaust amount from the main exhaust port and the exhaust amount from the sub exhaust port is controlled. A displacement control means for
The exhaust amount control means includes the exhaust amount from the main exhaust port and the exhaust amount so that the exhaust amount per unit time from the sub exhaust port is smaller than the exhaust amount per unit time from the main exhaust port. The ratio of the exhaust amount from the secondary exhaust port is controlled.

According to the present invention, the exhaust amount control means makes the exhaust amount per unit time of the sub exhaust port smaller than the exhaust amount per unit time of the main exhaust port.
For this reason, the high-temperature air that has not moved from the main exhaust port to the outside of the air-conditioning space but has moved to the outside of the exhaust hood and moved upward toward the ceiling plate is not obstructed without hindering the exhaust of hot air from the main exhaust port. It becomes possible to exhaust from the exhaust port to the outside of the air-conditioned space.

  Next, of the present invention, the invention described in claim 4 is the invention described in claim 3, wherein the exhaust amount control means sets the exhaust amount from the main exhaust port to EA1, and the sub exhaust. When the exhaust amount from the port is EA2, the ratio between the exhaust amount from the main exhaust port and the exhaust amount from the sub exhaust port so that EA1: EA2 is in the range of 19: 1 to 4: 1. It is characterized by controlling.

According to the present invention, the exhaust amount control means controls the ratio of the exhaust amount from the main exhaust port and the exhaust amount from the sub exhaust port to be in the range of 19: 1 to 4: 1.
For this reason, it becomes possible to control the ratio of the exhaust amount from the main exhaust port and the exhaust amount from the sub exhaust port to a ratio suitable for the replacement ventilation for the air-conditioned space, and improve the efficiency of the replacement ventilation for the air-conditioned space. It becomes possible.

Next, among the present inventions, the invention described in claim 5 is the invention described in any one of claims 2 to 4, wherein the air-conditioned space includes air in the air-conditioned space. There is a heating source to raise the temperature,
Exhaust state control means for controlling the exhaust state from the main exhaust port and the sub exhaust port according to the operating state of the heating source;
The exhaust state control means controls the exhaust state so as to exhaust air from the main exhaust port and the sub exhaust port during operation of the heating source, and after the operating heat source is stopped. When a predetermined time elapses, the exhaust state is controlled such that exhaust from the main exhaust port is stopped and exhaust from the sub exhaust port is continued.

According to the present invention, the main exhaust port and the sub exhaust port so that the exhaust state control means performs exhaust from the main exhaust port and the sub exhaust port during operation of the heating source that raises the temperature of the air in the air-conditioned space. Control the exhaust state from the. On the other hand, the main exhaust port and the sub exhaust port are configured such that when a predetermined time elapses after the operating heating source stops, the exhaust from the main exhaust port is stopped and the exhaust from the sub exhaust port is continued. Control the exhaust state from the.
For this reason, when there is a lot of high-temperature air in the air-conditioned space, the amount of exhaust from the main exhaust port and the sub-exhaust port is increased, and when high-temperature air in the air-conditioned space is reduced, the exhaust air is exhausted only from the sub-exhaust port. By performing, it becomes possible to reduce the amount of ventilation and the energy required for ventilation, and to make the thermal / air environment in the air-conditioned space good.

Next, among the present inventions, the invention described in claim 6 is the invention described in any one of claims 2 to 5, wherein the air supply port is the exhaust hood of the hanging part. It is characterized by opening above the lower end of the.
According to the present invention, the air supply port for supplying the low-temperature air into the air-conditioned space opens above the lower end of the exhaust hood in the hanging portion.
For this reason, it becomes possible to reduce the downward protrusion amount of the hanging part that hangs down from the ceiling plate, compared to the downward protrusion amount of the exhaust hood, and the movement of personnel and articles in the air-conditioned space is hindered by the hanging part. This can be suppressed.

Next, among the present inventions, the invention described in claim 7 is the invention described in any one of claims 1 to 6, wherein the air supply port faces the floor plate of the hanging part. It is characterized by opening in the lower surface.
According to the present invention, since the air supply opening opens to the lower surface facing the floor plate of the hanging part, the air supply port that supplies the low-temperature air into the air-conditioned space supplies the low-temperature air toward the floor plate.
For this reason, in the air-conditioned space, it is possible to efficiently raise the high-temperature air and exhaust it outside the air-conditioned space.

  According to the present invention, it is possible to arrange a member for supplying low-temperature air into the air-conditioned space, such as an air conditioner for producing low-temperature air, in a space formed between the frame ceiling and the ceiling plate. Therefore, it is possible to save the space of the room that forms the air-conditioned space that is the subject of replacement ventilation.

It is a figure which shows the structure of the replacement ventilation system of 1st embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is a perspective view of the grease filter which forms the main exhaust port side filter. It is a figure which shows the structure of the modification of 1st embodiment of this invention. It is a figure which shows the structure of the modification of 1st embodiment of this invention. It is a figure which shows the structure of the measuring apparatus used for the measurement of the temperature distribution and air concentration in an air-conditioning space at the time of performing the replacement ventilation in an air-conditioned space by the replacement ventilation system of a 1st invention example. It is the VII-VII sectional view taken on the line of FIG. It is a figure which shows the measurement result of the temperature distribution in an air-conditioned space when air in an air-conditioned space is ventilated by the ventilation system of a comparative example. It is a figure which shows the measurement result of the temperature distribution in an air conditioned space and the air density | concentration at the time of ventilating in an air conditioned space with the replacement ventilation system of a 1st invention example. It is a figure which shows the measurement result of the temperature distribution in an air conditioned space and the air density | concentration at the time of ventilating in an air conditioned space by the replacement ventilation system of the example of a 2nd invention. It is a figure which shows the measurement result of the temperature distribution in an air conditioned space and the air density | concentration at the time of ventilating in an air conditioned space by the substitution ventilation system of the example of 3rd invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings.
(Constitution)
First, the structure of the replacement ventilation system 1 of this embodiment is demonstrated using FIG.1 and FIG.2.
FIG. 1 is a diagram illustrating a configuration of a replacement ventilation system 1 according to the present embodiment. 2 is a cross-sectional view taken along the line II-II in FIG.

  The replacement ventilation system 1 of the present embodiment supplies low-temperature air lower than the temperature in the air-conditioned space 2 into the air-conditioned space 2, raises the high-temperature air higher than the low-temperature air, and exhausts the air outside the air-conditioned space 2. The ventilation system performs ventilation in the air-conditioned space 2. That is, the low-temperature air is air having a temperature lower than that in the air-conditioned space 2, and the high-temperature air is air having a temperature higher than that of the low-temperature air.

  Here, the air-conditioned space 2 is a space surrounded by the floor plate 4, the side wall 6, and the ceiling plate 10 that is arranged to be spaced downward from the frame ceiling 8. In the present embodiment, a case where the air-conditioned space 2 is a commercial kitchen will be described. Further, in the present embodiment, a case will be described in which the illumination 12 that generates heat during lighting is attached to the lower surface of the ceiling plate 10 (the surface facing the floor plate 4).

  A heating source 14 that increases the temperature of the air in the conditioned space 2 is disposed in the conditioned space 2. That is, when the heating source 14 is operated, the air in the conditioned space 2 is heated, and the temperature of the air in the conditioned space 2 is increased. In the present embodiment, a case will be described in which the heating source 14 is an electromagnetic cooker such as an electric griddle or an IH (Induction Heating) fryer. Specifically, as shown in FIG. 1, a case where the heating source 14 is a two-port IH range 14a, an electric griddle 14b, and an IH flyer 14c will be described. Therefore, in this embodiment, the air-conditioned space 2 is a commercial electric kitchen.

Hereinafter, a specific configuration of the replacement ventilation system 1 will be described.
As shown in FIGS. 1 and 2, the replacement ventilation system 1 includes an air supply port 16, a main exhaust port 18, a secondary exhaust port 20, an exhaust amount control unit 22, and an exhaust state control unit 24. Yes.
The air supply port 16 is disposed below the ceiling plate 10 and opens into an air supply chamber 26 that hangs down from the ceiling plate 10, and supplies low-temperature air into the air-conditioned space 2.

That is, in the present embodiment, a drooping portion 28 that hangs down from the ceiling plate 10 is formed by the air supply chamber 26 disposed below the ceiling plate 10. Therefore, in the present embodiment, the air supply port 16 is open to the hanging portion 28 formed by the air supply chamber 26.
In the present embodiment, the case where the air supply port 16 is formed by a perforated plate attached to the air supply chamber 26 will be described. Further, a part of the air supply chamber 26 may be disposed in a ceiling space 30 formed between the frame ceiling 8 and the ceiling board 10. In FIG. 2, for the sake of explanation, the size of the ceiling space 30 with respect to the air-conditioned space 2 is shown larger than the actual ratio.

Further, the air supply port 16 is opened above the lower end of an exhaust hood 32 described later in the air supply chamber 26.
In addition, the air supply port 16 opens to the lower surface (the surface facing the floor plate 4) of the air supply chamber 26, and supplies low-temperature air toward the floor plate 4. In FIG. 2, the direction in which the low temperature air is supplied from the air supply port 16 toward the floor plate 4 (the direction in which the low temperature air is blown out) is indicated by a downward arrow.

  Low-temperature air produced by taking outside air into the air conditioner 36 is supplied to the air supply chamber 26 via an air supply duct 38 via an outside air intake duct 34 described later. The supplied low-temperature air is blown out from the air supply port 16 with a predetermined air volume and speed. In addition, although this embodiment demonstrates the case where the replacement ventilation system 1 is provided with the four air supply chambers 26 as shown in FIG. 1, it is not limited to this. That is, the replacement ventilation system 1 may include three or less supply chambers 26, or may include five or more supply chambers 26.

The outside air intake duct 34 is a pipe that communicates outside air and the air conditioner 36, and includes an outside air amount control damper 40, an outside air state control means 42, an outside air intake amount control device 44, and an outside air gallery 46.
The outside air amount control damper 40 is disposed in the outside air intake duct 34 and is configured to be able to change the opening area in accordance with a control signal output from the outside air intake amount control device 44.

Therefore, the outside air amount control damper 40 can change the amount of outside air taken into the air conditioner 36 per unit time according to the control signal output from the outside air intake amount control device 44.
The outside air state control means 42 is arranged in the outside air intake duct 34 on the supply side of the air conditioner 36, and a thermometer capable of measuring the temperature in the outside air intake duct 34 and the gas in the outside air intake duct 34. It has a flow meter that can measure the flow rate.

Further, when the outside air state control means 42 measures the temperature in the outside air intake duct 34, it outputs an information signal including the measured temperature to the outside air intake amount control device 44. Similarly, when the outside air state control means 42 measures the gas flow rate in the outside air intake duct 34, the outside air state control means 42 outputs an information signal including the measured gas flow rate to the outside air intake amount control device 44.
The outside air intake amount control device 44 determines whether the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 in addition to the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20. The amount of low-temperature air supplied from the air supply port 16 into the air-conditioned space 2 is controlled according to the total exhaust amount.

  Specifically, the outside air intake amount control device 44 is based on the information signal output from the outside air state control unit 42 and the information signals output from the exhaust amount control unit 22 and the exhaust state control unit 24. A control signal for changing the opening area is generated, and the generated control signal is output to the outside air amount control damper 40. Similarly, the outside air intake amount control device 44 is based on the information signal output from the outside air state control means 42 and the information signals output from the exhaust amount control means 22 and the exhaust state control means 24. A control signal for changing the air flow rate is generated, and the generated control signal is output to the air supply blower 48.

Here, the information signal output by the exhaust amount control means 22 includes the total exhaust amount per unit time of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20. The information signal output by the exhaust state control means 24 includes the operating state of the heating source 14 and the exhaust states from the main exhaust port 18 and the sub exhaust port 20.
As described above, in the outside air intake amount control device 44, the supply amount of low-temperature air from the air supply port 16 per unit time is such that the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 per unit time. The opening area of the outside air amount control damper 40 and the air supply amount of the air supply blower 48 are controlled so as to be equal to the total exhaust amount.

The outside air gallery 46 is formed of, for example, a wing plate that is inclined so as to be able to suppress rain from entering the outside air intake duct 34, and is attached to an opening of the outside air intake duct 34 that communicates with the outside air.
The air conditioner 36 cools the outside air taken in to generate low-temperature air, and supplies the low-temperature air generated by the cooling unit to the air supply chamber 26 via the air supply duct 38. An air blower 48 is provided and disposed in the ceiling space 30.

Further, the air conditioner 36 can change the amount of low-temperature air blown to the air supply chamber 26 via the air supply duct 38 based on the information signal output by the exhaust amount control means 22 and the exhaust state control means 24. It has become a structure.
Therefore, the air conditioner 36 is configured to be able to change the supply amount of low-temperature air per unit time to the air-conditioned space 2 in accordance with the information signals output by the exhaust amount control unit 22 and the exhaust state control unit 24. Has been.

The main exhaust port 18 is opened above the heating source 14 in the ceiling plate 10, and hot air is supplied to the air-conditioned space 2 and the ceiling space 30 through a main exhaust duct 50 disposed in the ceiling space 30. Exhaust outside.
The main exhaust duct 50 is a pipe that communicates the main exhaust port 18 with the outside of the air-conditioned space 2 and the ceiling space 30, and includes a main exhaust air volume control damper 52, a main exhaust blower 54, main exhaust state control means 56, An exhaust amount control device 58 and a main exhaust gallery 60 are provided. In FIG. 2, for the sake of explanation, a portion of the main exhaust duct 50 between the main exhaust port 18 and the main exhaust air flow control damper 52 is bent and illustrated, but this portion is a straight line. In some cases.

The main exhaust air volume control damper 52 is disposed in the main exhaust duct 50 and is configured to be able to change the opening area in accordance with a control signal output from the main exhaust air volume control device 58.
The main exhaust blower 54 is formed by, for example, an exhaust fan equipped with an impeller and the like, and is disposed in the main exhaust duct 50 on the exhaust side with respect to the main exhaust air volume control damper 52, and the main exhaust air volume control device 58. According to the control signal which is output, it is comprised so that a ventilation volume can be changed.
Therefore, the main exhaust air volume control damper 52 and the main exhaust air blower 54 per unit time from the main exhaust port 18 to the outside of the air-conditioned space 2 and the ceiling space 30 according to the control signal output by the main exhaust air volume control device 58. It is possible to change the air flow rate.

The main exhaust state control means 56 is disposed in the main exhaust duct 50 on the exhaust side of the main exhaust blower 54, and a thermometer capable of measuring the temperature in the main exhaust duct 50 and the gas in the main exhaust duct 50. It has a flow meter that can measure the flow rate.
Further, when measuring the temperature in the main exhaust duct 50, the main exhaust state control means 56 outputs an information signal including the measured temperature to the main exhaust amount control device 58. Similarly, when the main exhaust state control means 56 measures the gas flow rate in the main exhaust duct 50, it outputs an information signal including the measured gas flow rate to the main exhaust amount control device 58.

Based on the information signal output by the main exhaust state control unit 56 and the information signals output by the exhaust amount control unit 22 and the exhaust state control unit 24, the main exhaust amount control device 58 is provided with an opening area of the main exhaust air amount control damper 52. Is generated, and the generated control signal is output to the main exhaust air volume control damper 52. Similarly, the main exhaust air amount control device 58 sends the main exhaust air blower 54 based on the information signal output by the main exhaust air state control unit 56 and the information signals output by the exhaust air amount control unit 22 and the exhaust state control unit 24. A control signal for changing the air volume is generated, and the generated control signal is output to the main exhaust blower 54.
The main exhaust gallery 60 is formed of, for example, a wing plate that is inclined so as to be able to suppress rain intrusion into the main exhaust duct 50, and has an opening communicating with the outside of the air-conditioning space 2 and the ceiling space 30 of the main exhaust duct 50. It is attached.

The main exhaust port 18 is covered with an exhaust hood 32.
The exhaust hood 32 is formed in a box shape by one side wall 6, two plate members 32 a and 32 b attached to the side wall 6, and one plate member 32 c that connects the two plate members. A space is formed between the board 10 and the floor board 4 by projecting from the board 10 to the floor board 4.
Further, a main exhaust port side filter 62 is attached inside the exhaust hood 32 so as to close the main exhaust port 18 when the main exhaust port 18 is viewed from below (floor plate 4 side).
In the present embodiment, a case where the main exhaust port side filter 62 is formed of a grease filter will be described.

Here, the configuration of the grease filter will be described with reference to FIG.
FIG. 3 is a perspective view of the grease filter 64 that forms the main exhaust port side filter 62.
As shown in FIG. 3, the grease filter 64 is formed in a cylindrical shape, and is attached to the inside of the exhaust hood 32 with the axial direction facing up and down.
Specifically, the grease filter 64 is formed in a multilayer structure in which a plurality of expanded metals are stacked, and the stacked expanded metals change the mesh direction in each layer.

  If it is the main exhaust port side filter 62 formed by the grease filter 64 as described above, it is possible to reduce the necessary surface wind speed necessary for collecting the oil content contained in the air. Even if the ventilation amount in the air-conditioned space 2 is small, high oil content collection efficiency can be realized. For this reason, in the electrification kitchen using the electromagnetic cooker or the electric cooker as the heating source 14, that is, in the replacement ventilation for the air-conditioned space 2 with little heat radiation into the space, as a filter for collecting oil contained in the oil mist or the like Is preferred.

Hereinafter, the description returns to FIG. 1 and FIG. 2.
Of the three plates 32 a to 32 c forming the exhaust hood 32, the two plates 32 a and 32 b facing each other with the main exhaust port 18 interposed therebetween, that is, the two plates 32 a and 32 b attached to the side wall 6. A sleeve wall 66 is attached to each lower end.
The sleeve wall 66 is a right triangle plate member that is continuous with the plate member that forms the exhaust hood 32. Specifically, the oblique sides of the sleeve wall 66 are inclined downward from the center of the air-conditioned space 2 toward the side wall 6, and the two orthogonal sides of the sleeve wall 66 are two plate members 32 a and 32 b, respectively. And attached to the side wall 6. Thereby, it becomes possible to suppress that the sleeve wall 66 inhibits the operation | movement of the person who cooks using the heating source 14. FIG.

The shape of the sleeve wall 66 is not limited to a right triangle, and may be, for example, a trapezoid or an arch shape.
The sub-exhaust port 20 is open at a position on the ceiling plate 10 between the air supply port 16 and the exhaust hood 32 in a plan view, via a sub-exhaust duct 68 disposed in the ceiling space 30. Then, the high-temperature air is exhausted out of the air-conditioned space 2 and the ceiling space 30.

The sub exhaust duct 68 is a pipe that communicates the sub exhaust port 20 with the outside of the air conditioning space 2 and the ceiling space 30, and includes a sub exhaust air volume control damper 70, a sub exhaust fan 72, a sub exhaust state control means 74, An exhaust amount control device 76 and a secondary exhaust gallery 78 are provided.
The sub exhaust air amount control damper 70 is disposed in the sub exhaust duct 68 and is configured to be able to change the opening area in accordance with a control signal output from the sub exhaust amount control device 76.

The secondary exhaust blower 72 is formed of, for example, an exhaust fan equipped with an impeller and the like, and is disposed in the secondary exhaust duct 68 on the exhaust side of the secondary exhaust air volume control damper 70. According to the control signal which is output, it is comprised so that a ventilation volume can be changed.
Therefore, the secondary exhaust air amount control damper 70 and the secondary exhaust air blower 72 per unit time from the secondary exhaust port 20 to the outside of the air conditioning space 2 and the ceiling space 30 according to the control signal output from the secondary exhaust air amount control device 76. It is possible to change the air flow rate.

The sub-exhaust state control means 74 is disposed in the sub-exhaust duct 68 on the exhaust side of the sub-exhaust fan 72, and a thermometer capable of measuring the temperature in the sub-exhaust duct 68 and the gas in the sub-exhaust duct 68. It has a flow meter that can measure the flow rate.
Further, when the temperature in the secondary exhaust duct 68 is measured, the secondary exhaust state control means 74 outputs an information signal including the measured temperature to the secondary exhaust amount control device 76. Similarly, when the sub exhaust state control means 74 measures the gas flow rate in the sub exhaust duct 68, it outputs an information signal including the measured gas flow rate to the sub exhaust amount control device 76.

The sub-exhaust air amount control device 76 opens the opening area of the sub-exhaust air amount control damper 70 based on the information signal output from the sub-exhaust state control unit 74 and the information signal output from the exhaust amount control unit 22 and the exhaust state control unit 24. Is generated, and the generated control signal is output to the sub-exhaust air volume control damper 70. Similarly, the sub-exhaust amount control device 76 sends the sub-exhaust fan 72 based on the information signal output from the sub-exhaust state control unit 74 and the information signals output from the exhaust amount control unit 22 and the exhaust state control unit 24. A control signal for changing the air volume is generated, and the generated control signal is output to the sub exhaust fan 72.
The secondary exhaust gallery 78 is formed of, for example, a wing plate that is inclined so as to be able to suppress rain intrusion into the secondary exhaust duct 68, and has an opening communicating with the outside of the air conditioning space 2 and the ceiling space 30 of the secondary exhaust duct 68. It is attached.

Further, in the ceiling panel 10, a sub exhaust port side filter 80 is attached below the sub exhaust port 20 so as to close the sub exhaust port 20 when the sub exhaust port 20 is viewed from below (floor plate 4 side). It has been.
In the present embodiment, a case where the secondary exhaust side filter 80 is a plate-like member formed by laminating glass fibers or the like will be described. In this case, it is preferable that the secondary exhaust side filter 80 is configured to be easily detachable from the ceiling board 10 using a magnet or the like.

The exhaust amount control means 22 controls the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20.
Specifically, the exhaust amount control means 22 determines that the exhaust amount per unit time from the secondary exhaust port 20 is greater than the exhaust amount per unit time from the main exhaust port 18 according to the operating state of the heating source 14. The ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 is calculated so as to decrease. Then, according to the calculated ratio, the opening area of the main exhaust air volume control damper 52 and the air volume of the main exhaust air blower 54 are calculated, and a control signal including the calculated opening area and air volume is sent to the main exhaust air volume control device. Output to 58. Similarly, the opening area of the sub exhaust air amount control damper 70 and the air volume of the sub exhaust fan 72 are calculated, and a control signal including the calculated opening area and air volume is output to the sub exhaust amount control device 76.

Further, the exhaust amount control means 22 is a unit of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 based on the control signal output to the main exhaust amount control device 58 and the sub exhaust amount control device 76. Calculate the total displacement per hour. Then, an information signal including the calculated total exhaust amount is output to the outside air intake amount control device 44.
In the present embodiment, when the exhaust amount control means 22 sets the exhaust amount from the main exhaust port 18 to EA1 and the exhaust amount from the sub exhaust port 20 to EA2 during operation of the heating source 14, EA1: EA2 Will be described in the case where the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 is controlled so as to be within the range of 19: 1 to 4: 1.

  Here, when the exhaust amount control means 22 controls the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20, first, it is determined whether or not the heating source 14 is operating. judge. In order to make it possible to determine whether or not the heating source 14 is in operation, for example, the configuration of the heating source 14, an information signal indicating that the heating source 14 is in operation, and an exhaust amount control means 22. To be output to. Thus, the exhaust amount control means 22 that has received the information signal output from the heating source 14 is configured to be able to make the above determination.

When it is determined that the heating source 14 is operating, a control signal for changing the opening area is output to the main exhaust amount control device 58 and the sub exhaust amount control device 76, respectively. Thus, the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 is controlled so that the above-described EA1: EA2 is in the range of 19: 1 to 4: 1.
In addition, when controlling EA1: EA2 mentioned above in the range of 19: 1-4: 1, the ratio of EA1: EA2 is controlled according to the heating temperature of the heating source 14, an output, etc., for example.

The exhaust state control means 24 controls the exhaust state from the main exhaust port 18 and the sub exhaust port 20 according to the operating state of the heating source 14.
Specifically, the exhaust state control means 24 exhausts from the main exhaust port 18 and the sub exhaust port 20 so as to perform exhaust from the main exhaust port 18 and the sub exhaust port 20 during operation of the heating source 14. To control. In this case, the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 is controlled by the exhaust amount control means 22 as described above.
Further, the exhaust state control means 24 outputs an information signal including the operating state of the heating source 14 and the exhaust states from the main exhaust port 18 and the sub exhaust port 20 to the outside air intake amount control device 44.

On the other hand, when a predetermined time elapses after the operating heating source 14 is stopped, the exhaust from the main exhaust port 18 is stopped and the main exhaust port 18 and the exhaust port 20 are exhausted. The exhaust state from the sub exhaust port 20 is controlled.
Specifically, a control signal for interrupting the flow of air from the main exhaust port 18 to the main exhaust duct 50 is output to the main exhaust amount control device 58 by changing the opening area of the main exhaust air amount control damper 52. In addition, a control signal for changing the opening area of the secondary exhaust air volume control damper 70 and ensuring the air flow from the secondary exhaust port 20 to the secondary exhaust duct 68 is output to the secondary exhaust air amount control device 76. In this case, a control signal for changing the opening area may be output to the secondary exhaust amount control device 76, or a control signal for maintaining the opening area may be output.

In order to make it possible to determine whether or not the heating source 14 is operating, for example, an information signal indicating that the heating source 14 is operating, an information signal indicating that the heating source 14 is operating, and an exhaust state control means 24 are provided. To be output to. Thus, the exhaust state control unit 24 that has received the information signal output from the heating source 14 is configured to be able to perform the above determination.
The predetermined time is set according to the volume of the air-conditioned space 2 and the like. For example, when the air-conditioned space 2 is a kitchen of about several tsubo, it is set to about 10 minutes.

(Operation)
Hereinafter, the operation of the replacement ventilation system 1 of the present embodiment will be described with reference to FIGS. 1 to 3.
In the following description, fried food such as croquettes is cooked in the air-conditioned space 2 by the IH fryer that is the heating source 14, and the replacement ventilation in the air-conditioned space 2 is performed by the replacement ventilation system 1 of the present embodiment. The case will be described.
When cooking is performed by operating the heating source 14 (IH fryer), high-temperature air generated by cooking, oil mist, and the like are present in the air-conditioned space 2.
At this time, low-temperature air having a temperature lower than that in the air-conditioned space 2 is supplied from the air supply opening 16 into the air-conditioned space 2 from below the ceiling plate 10 toward the floor plate 4. The supply of low-temperature air from the air supply port 16 into the air-conditioned space 2 may be performed before the operation of the heating source 14.

Further, according to the operation of the heating source 14, the exhaust amount control means 22 determines that the exhaust amount EA 1 from the main exhaust port 18: the exhaust amount EA 2 from the secondary exhaust port 20 is within the range of 19: 1 to 4: 1. Thus, the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 is controlled. That is, when cooking is performed by operating the heating source 14, the exhaust amount control means 22 causes the exhaust amount per unit time from the sub exhaust port 20 to be changed from the main exhaust port 18 according to the operation of the heating source 14. The ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 is controlled so as to be smaller than the exhaust amount per unit time.
When low-temperature air is supplied into the air-conditioned space 2 from the air supply port 16, high-temperature air that is higher than the low-temperature air existing in the air-conditioned space 2 (higher temperature than the low-temperature air that has existed in the air-conditioned space 2 before cooking). Air and high-temperature air generated by cooking) rise in the conditioned space 2.

Then, the high temperature air rising in the air-conditioned space 2 is exhausted from the main exhaust port 18 to the outside of the air-conditioned space 2 and the ceiling space 30 through the main exhaust duct 50, and replacement ventilation in the air-conditioned space 2 is performed.
Further, the high-temperature air that is not exhausted from the main exhaust port 18 to the outside of the air-conditioning space 2 but moves to the outside of the exhaust hood 32 and rises toward the ceiling plate 10 passes from the secondary exhaust port 20 via the secondary exhaust duct 68. The air is exhausted outside the air-conditioned space 2 and the ceiling space 30.

  Further, when the high-temperature air rises in the air-conditioned space 2, before the elevated high-temperature air is exhausted from the main exhaust port 18, oil contained in oil mist or the like existing in the air-conditioned space 2 It is collected by the filter 62. Similarly, when high-temperature air rises in the air-conditioned space 2, before the elevated high-temperature air is exhausted from the secondary exhaust port 20, oil contained in oil mist or the like existing in the air-conditioned space 2 It is collected by the side filter 80.

When a predetermined time has elapsed from the time when cooking is ended or interrupted and the operating heating source 14 is stopped, the exhaust state control means 24 stops the exhaust from the main exhaust port 18 and the sub exhaust port. The exhaust state from the main exhaust port 18 and the sub exhaust port 20 is controlled so as to exhaust from the exhaust gas 20. At this time, the supply of low-temperature air from the air supply port 16 is continued.
Note that the supply of the low-temperature air from the air supply port 16 may be ended artificially by the judgment of a worker who has performed cooking. For example, a temperature sensor is arranged in the air-conditioned space 2 and this temperature is set. You may complete | finish automatically according to the temperature in the air-conditioned space 2 which the sensor detected.
When the supply of the low-temperature air from the air supply port 16 is finished, the replacement ventilation in the air-conditioned space 2 by the replacement ventilation system 1 of the present embodiment is ended.

(Effects of the first embodiment)
The effects of this embodiment are listed below.
(1) In the replacement ventilation system 1 of the present embodiment, the air supply chamber 26 that protrudes downward from the ceiling board 10 through the air supply port 16 that supplies low-temperature air that is lower than the temperature in the air-conditioned space 2 into the air-conditioned space 2. An opening is formed in the drooping portion 28 that is hung from the ceiling plate 10.
For this reason, it becomes possible to arrange | position the air conditioner 36 etc. for producing low temperature air in the ceiling space 30 formed between the frame ceiling 8 and the ceiling board 10. FIG.
As a result, it is possible to save space in the room that forms the air-conditioned space 2 that is subject to replacement ventilation. Therefore, the replacement ventilation system 1 can be replaced by remodeling or the like for a building that does not have the replacement ventilation system 1 at the time of construction. It becomes easy to construct.

Moreover, compared with the case where the air supply opening 16 is opened to the ceiling board 10, it becomes possible to suppress attraction and diffusion of air in the upper part of the air-conditioned space 2, and the ventilation state in the air-conditioned space 2 is mixed ventilation. This can be suppressed.
For this reason, it is possible to stably perform replacement ventilation in the air-conditioned space 2, and it is possible to stably and efficiently ventilate the air-conditioned space 2 with a small amount of air.
As a result, the ventilation amount and the energy required for ventilation can be reduced, and the thermal / air environment in the air-conditioned space 2 can be stably made good.

(2) In the replacement ventilation system 1 of the present embodiment, high-temperature air is moved outside the air-conditioned space 2 at a position between the exhaust hood 32 and the air supply port 16 that covers the periphery of the main exhaust port 18 in the ceiling panel 10. The secondary exhaust port 20 for exhausting is opened.
For this reason, the air is not exhausted from the main exhaust port 18 to the outside of the air-conditioned space 2, moves to the outside of the exhaust hood 32, rises toward the ceiling plate 10, and exists between the hanging portion 28 and the exhaust hood 32. Hot air can be exhausted from the sub-exhaust port 20 to the outside of the air-conditioned space 2.
As a result, the high-temperature air that has risen in the air-conditioned space 2 is efficiently exhausted outside the air-conditioned space 2 with respect to the entire air-conditioned space 2 as compared with the case where the exhaust port 20 is not opened according to the ceiling plate 10. It becomes possible to make the thermal / air environment in the air-conditioned space 2 in a good state.

(3) In the replacement ventilation system 1 of the present embodiment, the exhaust amount control means 22 makes the exhaust amount per unit time of the sub exhaust port 20 smaller than the exhaust amount per unit time of the main exhaust port 18.
For this reason, without disturbing the exhaust of the high-temperature air from the main exhaust port 18, the main exhaust port 18 is not exhausted outside the air-conditioned space 2, but moves to the outside of the exhaust hood 32 and rises toward the ceiling plate 10. Hot air can be exhausted from the sub-exhaust port 20 to the outside of the air-conditioned space 2.

As a result, most of the high-temperature air generated from the heating source 14 that is a generation source of high-temperature air can be exhausted from the main exhaust port 18 and is not exhausted from the main exhaust port 18 in the conditioned space 2. It is possible to exhaust the high-temperature air existing in the sub-exhaust port 20.
As a result, the high-temperature air that has risen in the air-conditioned space 2 can be efficiently air-conditioned as compared with the case where the exhaust amount per unit time of the secondary exhaust port 20 is greater than or equal to the exhaust amount per unit time of the main exhaust port 18. It becomes possible to exhaust to the outside of the space 2, and it becomes possible to make the thermal / air environment in the air-conditioned space 2 in a good state.

(4) In the replacement ventilation system 1 of the present embodiment, the exhaust amount control means 22 sets the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 to 19: 1 to 4: 1. Control to be within range.
For this reason, it becomes possible to control the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 to a ratio suitable for the replacement ventilation for the air-conditioned space 2, and the replacement ventilation for the air-conditioned space 2. Efficiency can be improved.
As a result, it is possible to ensure a balance between the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 and efficiently exhaust the high-temperature air rising in the air-conditioned space 2 to the outside of the air-conditioned space 2. It becomes possible, and it becomes possible to make the thermal / air environment in the air-conditioned space 2 into a good state.

(5) In the replacement ventilation system 1 of the present embodiment, the exhaust state control means 24 performs the exhaust from the main exhaust port 18 and the secondary exhaust port 20 while the heating source 14 is operating, The exhaust state from the sub exhaust port 20 is controlled. On the other hand, when a predetermined time elapses after the operating heating source 14 stops, the main exhaust port 18 stops the exhaust from the main exhaust port 18 and continues the exhaust from the sub exhaust port 20. The exhaust state from 18 and the sub exhaust port 20 is controlled.
For this reason, in the state where a lot of high-temperature air exists in the air-conditioned space 2, the exhaust amount from the main exhaust port 18 and the secondary exhaust port 20 is increased, and in the state where the high-temperature air in the air-conditioned space 2 is reduced, the secondary exhaust port. Exhaust is performed only from 20.
As a result, high-temperature air in the air-conditioned space 2 can be efficiently exhausted, so that the amount of ventilation and energy required for ventilation can be reduced, and the thermal / air environment in the air-conditioned space 2 is in a good state It becomes possible.

(6) In the replacement ventilation system 1 of the present embodiment, the air supply port 16 that supplies the low-temperature air into the air-conditioned space 2 is above the lower end of the exhaust hood 32 in the hanging part 28 formed by the air supply chamber 26. Open at.
For this reason, it is possible to reduce the downward protrusion amount of the drooping portion 28 hanging from the ceiling plate 10 as compared with the downward protrusion amount of the exhaust hood 32, and the movement of personnel and articles in the air-conditioned space 2 is supplied. It is possible to suppress the inhibition by the air chamber 26.
As a result, compared to the case where the air supply port 16 opens at the same height as the lower end of the exhaust hood 32 or below the lower end of the exhaust hood 32, the movement of personnel and articles in the air-conditioned space 2 is performed smoothly. Therefore, the working environment in the air-conditioned space 2 can be in a good state.

(7) In the replacement ventilation system 1 of the present embodiment, the air supply port 16 that supplies the low-temperature air into the air-conditioned space 2 opens on the lower surface of the hanging portion 28 that is formed by the air supply chamber 26 and faces the floor plate 4.
For this reason, the air supply port 16 that supplies the low-temperature air into the air-conditioned space 2 supplies the low-temperature air toward the floor plate 4. It becomes possible to exhaust outside.
As a result, compared with the case where the air supply port 16 supplies low-temperature air toward the side wall 6 and the ceiling plate 10, the high-temperature air in the air-conditioned space 2 can be efficiently exhausted. The energy required for ventilation can be reduced, and the thermal / air environment in the air-conditioned space 2 can be made good.

(Application examples)
Hereinafter, application examples of this embodiment will be listed.
(1) In the replacement ventilation system 1 of the present embodiment, the secondary exhaust port 20 is opened at a position between the exhaust hood 32 and the air supply port 16 covering the periphery of the main exhaust port 18 in the ceiling panel 10. However, the present invention is not limited to this, and a configuration in which the secondary exhaust port 20 is not opened, that is, a configuration in which the secondary exhaust port 20 is not provided may be employed.

(2) The replacement ventilation system 1 of the present embodiment is configured to include the exhaust amount control means 22 for controlling the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20. It is not limited to. In other words, the exhaust amount control means 22 may not be provided, and the ratio between the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 may not be controlled.
(3) In the replacement ventilation system 1 of the present embodiment, the exhaust amount control means 22 sets the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 to 19: 1 to 4: 1. Although the control is performed so as to be within the range, the present invention is not limited to this. That is, the exhaust amount control means 22 may control the ratio of the exhaust amount from the main exhaust port 18 and the exhaust amount from the sub exhaust port 20 to be outside the range of 19: 1 to 4: 1. Good.

(4) The replacement ventilation system 1 of the present embodiment is configured to include the exhaust state control means 24 that controls the exhaust state from the main exhaust port 18 and the sub exhaust port 20 according to the operating state of the heating source 14. However, the present invention is not limited to this. That is, the exhaust state control means 24 may not be provided, and the exhaust state from the main exhaust port 18 and the sub exhaust port 20 may not be controlled.
(5) In the replacement ventilation system 1 of the present embodiment, the air supply port 16 is configured to open above the lower end of the exhaust hood 32 in the hanging portion 28 formed by the air supply chamber 26. It is not limited. That is, the air supply port 16 may be configured to open in the hanging portion 28 at the same height as the lower end of the exhaust hood 32 or below the lower end of the exhaust hood 32.

(6) In the replacement ventilation system 1 of the present embodiment, the air supply port 16 opens on the lower surface facing the floor plate 4 of the hanging portion 28 formed by the air supply chamber 26, and the air supply port 16 faces the floor plate 4. However, the configuration is such that the low-temperature air is supplied toward the floor plate 4 that supplies the low-temperature air, but the present invention is not limited to this. In other words, the air supply port 16 may be open to the surface of the hanging portion 28 facing the side wall 6 and the ceiling plate 10, and the air supply port 16 may supply low-temperature air toward the side wall 6 and the ceiling plate 10. . Here, when the air supply port 16 opens on the surface facing the side wall 6 of the hanging part 28, the surface of the hanging part 28 that faces other than the side surface 6 close to the heating source 14 among the four side walls 6. In addition, the air supply port 16 is opened. This is because when the air supply port 16 is opened on the surface of the drooping portion 28 that faces the side surface 6 near the heating source 14 among the four side walls 6, the low-temperature air supplied from the air supply port 16 This is because moving in the direction of 14 makes it easy for the ventilation state in the air-conditioned space 2 to be mixed ventilation, making it difficult to perform replacement ventilation in the air-conditioned space 2.

(7) In the replacement ventilation system 1 of the present embodiment, the sleeve wall 66 is attached to the lower ends of the plate members 32a and 32b that form the exhaust hood 32. However, the present invention is not limited to this, and the plate member that forms the exhaust hood 32 It is good also as a structure which does not attach the sleeve wall 66 to 32a, 32b.
(8) In the replacement ventilation system 1 of the present embodiment, the air-conditioned space 2 is a commercial electric kitchen. However, the present invention is not limited to this. For example, the air-conditioned space 2 may be a frozen food manufacturing plant or information It is good also as a data center etc. which arranged many processing terminals. That is, if the air-conditioned space 2 is an environment where heated air is generated or an environment where oil containing air is generated, replacement ventilation using the replacement ventilation system 1 of the present embodiment can be effectively performed. It becomes. In addition, when the air-conditioned space 2 is a data center in which a large number of information processing terminals are arranged, the heating source 14 is an OA device such as an information processing terminal.

(9) In the replacement ventilation system 1 of the present embodiment, the air supply port 16 is formed by the perforated plate attached to the hanging portion 28 formed by the air supply chamber 26, but is not limited to this. That is, for example, as shown in FIG. 4, four hanging walls 82 that hang down toward the floor plate 4 are attached to each of the four sides of the air supply chamber 26 on the lower surface of the air supply chamber 26 facing the floor plate 4. The air supply chamber 26 and the four hanging walls 82 form a hanging portion 28 that hangs down from the ceiling plate 10. Further, a supply port 84 for supplying low-temperature air from the air conditioner 36 to the air supply chamber 26 is formed on the lower surface of the air supply chamber 26 facing the floor plate 4. Then, the air supply port 16 that supplies substantially low-temperature air to the air-conditioned space 2 is formed by an opening that opens at the lower end of the space surrounded by the four vertical walls 82, and the air supply port 16. May be arranged below the ceiling board 10.

  FIG. 4 is a diagram illustrating a configuration of a modification of the first embodiment. Further, in FIG. 4, as in FIG. 2, the area of the ceiling space 30 with respect to the air-conditioned space 2 is illustrated larger than the actual ratio for the sake of explanation. Similarly, in FIG. 4, a portion of the main exhaust duct 50 between the main exhaust port 18 and the main exhaust air flow control damper 52 is bent for illustration, but this portion is It may be linear.

(10) In the replacement ventilation system 1 of the present embodiment, the air supply port 16 is formed by the perforated plate attached to the hanging portion 28 formed by the air supply chamber 26, but is not limited to this. That is, for example, as shown in FIG. 5, the air supply port 16 may be formed by an opening that opens to the entire lower surface of the hanging portion 28 that faces the floor plate 4. In this case, for example, as shown in FIG. 5, the air supply chamber 26 is disposed in the ceiling space 30, and the drooping portion 28 of the lower surface facing the floor plate 4 of the air supply chamber 26 disposed in the ceiling space 30. Four hanging walls 82 that hang down toward the floor plate 4 are formed on each of the four sides. Further, a supply port 84 for supplying low-temperature air from the air conditioner 36 to the air supply chamber 26 is formed in the ceiling plate 10. As a result, the drooping portion 28 that hangs down from the ceiling plate 10 is formed by the four drooping walls 82, and the air supply ports 16 that supply substantially low-temperature air to the air-conditioned space 2 are separated from the four drooping walls 82. Formed at the lower end of the space surrounded by the wall 82, the air supply port 16 is disposed below the ceiling plate 10.

  FIG. 5 is a diagram illustrating a configuration of a modification of the first embodiment. Further, in FIG. 5, as in FIG. 2, for the sake of explanation, the area of the ceiling space 30 with respect to the air-conditioned space 2 is illustrated to be larger than the actual ratio. Similarly, in FIG. 5, for the purpose of explanation, a portion of the main exhaust duct 50 between the main exhaust port 18 and the main exhaust air flow control damper 52 is bent and illustrated. It may be linear.

(11) In the replacement ventilation system 1 of the present embodiment, the grease filter 64 is formed in a cylindrical shape, but is not limited to this. That is, the grease filter 64 may be formed in a shape other than a cylindrical shape, such as a cylindrical shape having a square cross section.
(12) In the replacement ventilation system 1 of the present embodiment, the air conditioner 36 is disposed in the ceiling space 30, but the present invention is not limited to this. That is, the air conditioner 36 may be installed in a room other than the room forming the air-conditioned space 2 such as an air-conditioning room, and the air conditioner 36 and the air supply chamber 26 may be connected by the air supply duct 38.

(First Example)
When the replacement ventilation in the air-conditioned space is performed by a replacement ventilation system (hereinafter referred to as “first invention example”) partially different in configuration from the replacement ventilation system of the first embodiment described above, Compared to the case where replacement ventilation is performed in a conditioned space by a ventilation system (hereinafter referred to as “comparative example”) having a configuration significantly different from that of a replacement ventilation system, the temperature distribution and air concentration (hereinafter referred to as “ Air concentration ”).

First, the measurement used for the measurement of the temperature distribution and the air concentration in the conditioned space 2 when the replacement ventilation in the conditioned space 2 is performed by the replacement ventilation system 1 of the first invention example, using FIGS. 6 and 7. The configuration of the apparatus will be described.
FIG. 6 is a diagram showing a configuration of a measuring device used for measuring the temperature distribution and air concentration in the air-conditioned space 2 when the replacement ventilation in the air-conditioned space 2 is performed by the replacement ventilation system 1 of the first invention example. is there. FIG. 7 is a sectional view taken along line VII-VII in FIG.

The replacement ventilation system 1 of the first invention example is the same as the replacement ventilation system of the first embodiment described above except that the secondary exhaust port is not provided and the sleeve wall is not attached to the plate material forming the exhaust hood 32. Since it is the same structure, the description is abbreviate | omitted (refer FIGS. 1-3).
The size of the conditioned space 2 is 4000 [mm] in the direction of the arrow X shown in FIG. 6, and 4000 [mm] in the direction of the arrow Y shown in FIGS. 6 and 7. The length in the arrow Z direction shown in FIG.

The floor plate 4, the side wall 6 and the ceiling plate 10 forming the air-conditioned space 2 each have a heat insulation performance of 0.49 [W · m ² / K] and are formed of a heat insulation panel having a thickness of 42 [mm]. .
Moreover, the illumination 12 attached to the lower surface of the ceiling board 10 makes a set of two 40W fluorescent lamps, and attaches it to four places on the lower surface of the ceiling board 10, respectively.
As shown in FIGS. 6 and 7, this measuring apparatus includes a plurality of space temperature sensors 86, a plurality of surface temperature sensors 88, and a plurality of tracer gas (SF ₆ : sulfur hexafluoride) concentration detection sensors (FIG. (Not shown), a plurality of tracer gas (SF6) generators 90, and a disturbance generator 92.

A part of each space temperature sensor 86 is arranged in the air-conditioned space 2 at an interval of 600 mm in the center in the arrow X direction shown in FIG. 6 and in the arrow Y direction shown in FIGS. And arranged in 6 columns. Further, the remainder of each space temperature sensor 86 is left and right in each row from the space temperature sensors 86 arranged in the fifth row counted from the side wall 6 on the side far from the exhaust hood 32 in the direction of the arrow X shown in FIG. Arranged and arranged in three rows. Further, the remainder of each space temperature sensor 86 is disposed on the side of the heating source 14.
In addition, the shortest distance from the side wall 6 of the space temperature sensor 86 is 100 [mm].

  In addition, each space temperature sensor 86 has a floor plate 4 in each row in order to avoid interference with the hanging portion 28 formed by the air supply chamber 26 up to the third row counting from the side wall 6 on the side far from the exhaust hood 32. 7 are arranged at intervals of 200 [mm] in the direction of arrow Z shown in FIG. 7 using poles 94 standing between the ceiling plate 10 and the ceiling plate 10. On the other hand, in the remaining three rows, the rows 94 are arranged in 13 rows at intervals of 200 [mm] in the direction of the arrow Z shown in FIG.

In addition, the shortest distance from the floor board 4 and the ceiling board 10 of the space temperature sensor 86 is 50 [mm].
Each surface temperature sensor 88 is arranged on the floor board 4 and the ceiling board 10.
The surface temperature sensors 88 arranged on the floor board 4 are arranged in six rows at intervals of 600 [mm] in the direction of the arrow Y shown in FIGS. 6 and 7 at the center in the arrow X direction shown in FIG. Is arranged.

On the other hand, each surface temperature sensor 88 arranged on the ceiling board 10 is centered in the direction of the arrow X shown in FIG. 6 in order to avoid interference with the hanging part 28 formed by the air supply chamber 26. 7 are arranged at intervals of 600 [mm] in the direction of the arrow Y shown in FIG.
Each tracer gas concentration detection sensor uses a fourth row of poles 94 counted from the side wall 6 on the side far from the exhaust hood 32, and in the direction of arrow Z shown in FIG. The tracer gas (SF ₆ ) concentration measurement point 96 is set at the same position as that of the space temperature sensor 86 closest to the floor plate 4 in the third to fifth steps from the ceiling plate 10.

Each tracer gas generator 90 is disposed at the center of the heating source 14, specifically, the IH range 14a (output: 5 kW + 5 kW), the electric griddle 14b (output: 6.2 kW), and the IH fryer 14c (output: 4 kW). Each of them has a configuration capable of quantitatively generating (0.3 L / min) tracer gas (SF ₆ ). The tracer gas generator 90 disposed in the IH range 14a is disposed in the outside (left side in FIG. 6) of the two ranges.

  The disturbance generator 92 has the same configuration as that of the disturbance apparatus used in “Nordtest VVS-088”, which is a disturbance test method used for the collection performance test of the kitchen hood, and has a width of 0.5 [m] and a height. This is a device that moves a 1.0 [m] plate to the left and right at a moving width of 1.0 [m] and a constant moving speed of 0.5 [m / s]. The moving center of the plate is set at a position 650 [mm] away from the center of the heating source 14 in the direction of the arrow X shown in FIG. 6 in the direction of the arrow Y shown in FIGS.

Hereinafter, with reference to FIGS. 6 and 7, the temperature distribution and the air concentration in the conditioned space are measured using the replacement ventilation system of the first invention example and the ventilation system of the comparative example with reference to FIGS. The measurement environment and measurement conditions for performing the measurement will be described.
FIG. 8 is a diagram illustrating measurement results of the temperature distribution and air concentration in the air-conditioned space 2 when the air-conditioned space 2 is ventilated by the ventilation system of the comparative example. In FIG. 8, the temperature distribution in the air-conditioned space 2 is indicated by a plurality of types of hatching. Further, in FIG. 8, the value obtained by making the air concentration in the air-conditioned space 2 dimensionless [%] with the complete mixed concentration is indicated by a number outside () indicated in the frame, and the tracer gas concentration in the air-conditioned space 2 [ppm] is indicated by the number in () described in the frame.

Further, in FIG. 8, the low temperature air supplied from the air supply port 16 into the conditioned space 2 is indicated by an arrow “SA”. Similarly, in FIG. 8, the exhaust from the main exhaust port 18 is indicated by an arrow “EA”.
Note that the ventilation system of the comparative example is the same as that described above except that the air supply port 16 opens below the center of the side wall 6 in the height direction and opens into the air supply chamber 26 protruding into the air-conditioned space 2 from the side wall 6. Since the configuration is the same as that of the replacement ventilation system 1 of the first invention example, the description thereof is omitted (see FIGS. 1 to 3).

The configuration of the measuring device used for measuring the temperature distribution and the air concentration in the air-conditioned space 2 when the replacement ventilation in the air-conditioned space 2 is performed by the ventilation system of the comparative example is as follows. All the temperature sensors 86 are arranged at intervals of 200 [mm] using the above-described poles 94 and arranged in 13 stages, and the surface temperature sensors 88 arranged on the floor panel 4 and the ceiling panel 10 are Both have the same configuration as that of the measuring apparatus shown in FIGS. 6 and 7 except that they are arranged at intervals of 600 [mm] and arranged in six rows, and the description thereof is omitted (FIG. 6). And FIG. 7).
Moreover, the measurement of the temperature distribution and air concentration in the air-conditioned space 2 when performing the replacement ventilation in the air-conditioned space 2 by the ventilation system of the comparative example is performed under the conditions shown in Tables 1 and 2 below.

  On the other hand, FIG. 9 is a diagram showing the measurement results of the temperature distribution and air concentration in the air-conditioned space 2 when the air-conditioned space 2 is ventilated by the replacement ventilation system 1 of the first invention example. In FIG. 9, as in FIG. 8, the temperature distribution in the conditioned space 2 is indicated by a plurality of types of hatching. Also, in FIG. 9, as in FIG. 8, the value obtained by making the air concentration in the conditioned space 2 dimensionless [%] with the complete mixed concentration is indicated by a number outside () indicated in the frame, and the conditioned space The tracer gas concentration [ppm] in 2 is indicated by the number in () described in the frame.

In FIG. 9, similarly to FIG. 8, the low temperature air supplied from the air supply port 16 into the conditioned space 2 is indicated by an arrow “SA”. Similarly, in FIG. 9, similarly to FIG. 8, exhaust from the main exhaust port 18 is indicated by an arrow “EA”.
In addition, the temperature distribution and air concentration in the air-conditioned space 2 when the replacement ventilation in the air-conditioned space 2 is performed by the replacement ventilation system of the first invention example is performed under the conditions shown in Tables 3 and 4 below. .

When the replacement ventilation in the air-conditioned space 2 is performed by the ventilation system of the comparative example and the replacement ventilation system of the first invention example, the set temperature in the air-conditioned space 2 is set to 25.0 [° C.] In this case, the supply air temperature is set so that the sensible heat amount by supply air is the same.
Hereinafter, with reference to FIGS. 6 and 7, the temperature distribution and the air concentration in the conditioned space are measured using the replacement ventilation system of the first invention example and the ventilation system of the comparative example with reference to FIGS. The results will be described.

・ Temperature distribution As shown in FIGS. 8 and 9, in the ventilation by the ventilation system of the comparative example and the ventilation by the replacement ventilation system 1 of the first invention example, the work area (floor surface—the upper surface of the floor board 4) There is little difference in the thermal environment at a height from 1 to 1800 [mm]. Further, in the first invention example shown in FIG. 9, the high temperature region near the ceiling board 10 is small. This is because the low-temperature air of 23.5 ° C. supplied from the air supply port 16 opened to the hanging portion 28 formed by the air supply chamber 26 protruding downward from the ceiling plate 10 is not only the lower part of the air-conditioned space 2, This is because it is considered that the temperature distribution in the upper part of the air-conditioned space 2 is also affected.

Tracer gas concentration In the comparative example shown in FIG. 8, the air concentration in the upper part of the conditioned space 2 is higher and the air concentration in the lower part of the conditioned space 2 is lower than in the first invention example shown in FIG. Further, in the comparative example shown in FIG. 8, the change in the air concentration is significant at the boundary between the work area and the upper part of the air-conditioned space 2, but the first invention example shown in FIG. The tracer gas concentration in the air-conditioned space 2 gradually increases over the surface.

From the above measurement results, it was confirmed that the first invention example had less difference in the thermal environment in the work area and the change in the tracer gas concentration in the air-conditioned space 2 was gradual compared to the comparative example. . Thereby, compared with the comparative example, the first invention example confirmed that the thermal / air environment in the air-conditioned space 2 can be stably made good.
This is because the air supply opening 16 is opened to a hanging portion 28 formed by an air supply chamber 26 projecting downward from the ceiling plate 10, and low temperature air is supplied from below the ceiling plate 10, whereby the air-conditioned space 2. This is because it is possible to suppress air attraction and diffusion in the upper part of the air.

(Second embodiment)
When the replacement ventilation in the air-conditioned space 2 is performed by a replacement ventilation system (hereinafter referred to as “second invention example”) partially different in configuration from the replacement ventilation system of the first embodiment described above, and the first described above. The temperature distribution in the air-conditioned space 2 and the tracer gas concentration in the air-conditioned space 2 were measured when the replacement ventilation in the air-conditioned space 2 was performed according to the comparative example described in the example.

  The configuration of the measuring device used for measuring the temperature distribution in the air-conditioned space 2 and the tracer gas concentration in the air-conditioned space 2 when the replacement ventilation in the air-conditioned space 2 is performed by the replacement ventilation system of the second invention example is as described above. Since it is the same as that of the measuring apparatus when the replacement ventilation in the air-conditioned space 2 is performed by the replacement ventilation system of the first invention example described in the first embodiment, the description thereof is omitted (see FIGS. 6 and 7). ).

Further, the replacement ventilation system 1 of the second invention example has the same configuration as the replacement ventilation system of the first embodiment described above, except that the sleeve wall is not attached to the plate material forming the exhaust hood 32. Description is omitted (see FIGS. 1 to 3).
The size of the air-conditioned space 2, the floor board 4, the side walls 6 and the ceiling board 10 that form the air-conditioned space 2, and the illumination 12 attached to the lower surface of the ceiling board 10 are the same as those in the first embodiment described above. Is omitted.

Hereinafter, referring to FIG. 9 and using FIG. 10, the temperature distribution in the conditioned space 2 and the tracer gas in the conditioned space 2 using the replacement ventilation system of the second invention example and the ventilation system of the first invention example will be described. The measurement environment and measurement conditions for measuring the concentration will be described.
In addition, since the measurement conditions in the second embodiment are the same as those in the first embodiment described above, description thereof is omitted.

  FIG. 10 is a diagram showing the measurement results of the temperature distribution in the air-conditioned space 2 and the tracer gas concentration in the air-conditioned space 2 when the inside of the air-conditioned space 2 is ventilated by the replacement ventilation system 1 of the second invention example. . In FIG. 10, as in FIG. 8, the temperature distribution in the conditioned space 2 is indicated by a plurality of types of hatching. Further, in FIG. 10, as in FIG. 8, the value obtained by making the tracer gas concentration in the air-conditioned space 2 dimensionless [%] with the complete mixed concentration is indicated by a number outside () indicated in the frame. The tracer gas concentration [ppm] in the space 2 is indicated by the number in () described in the frame.

In FIG. 10, similarly to FIG. 8, the low temperature air supplied from the air supply port 16 into the conditioned space 2 is indicated by an arrow “SA”.
In FIG. 10, the exhaust from the main exhaust port 18 is indicated by an arrow “EA1”, and the exhaust from the sub exhaust port 20 is indicated by an arrow “EA2”.
Moreover, the measurement of the temperature distribution in the air-conditioned space 2 and the tracer gas concentration in the air-conditioned space 2 when performing the replacement ventilation in the air-conditioned space 2 by the replacement ventilation system of the second invention example is shown in Tables 5 and 6 below. Performed under the conditions shown in.

In addition, when performing replacement ventilation in the air-conditioned space 2 by the ventilation system of the second invention example and the replacement ventilation system of the first invention example, the set temperature in the air-conditioned space 2 is set to 25.0 [° C.] In each case, the supply air temperature is set so that the sensible heat amount by supply air is the same.
Hereinafter, referring to FIG. 9 and using FIG. 10, the temperature distribution in the conditioned space 2 and the tracer gas in the conditioned space 2 using the replacement ventilation system of the second invention example and the ventilation system of the first invention example will be described. The result of measuring the concentration will be described.

-Temperature distribution As FIG.9 and FIG.10 shows, in the ventilation by the replacement ventilation system 1 of a 2nd invention example, compared with the ventilation by the ventilation system of a 1st invention example, it is especially conditioned space 2 In the upper part, the hot area is reduced.
Tracer gas concentration In the second invention example shown in FIG. 10, compared to the first invention example shown in FIG. 9, the tracer gas concentration particularly at a height of 1850 [mm] or more from the upper surface of the floor plate 4. Has fallen.

From the above measurement results, it is confirmed that the second invention example has a reduced high-temperature region and a lower tracer gas concentration, especially in the upper part of the air-conditioned space 2, compared to the first invention example. did. Thereby, compared with the 1st invention example, it confirmed that the 2nd invention example could make the thermal-air environment in the conditioned space 2 into a favorable state stably.
This is because the exhaust port 20 is opened according to the position of the ceiling plate 10 between the air supply port 16 and the exhaust hood, so that it is not exhausted from the main exhaust port 18 to the outside of the air-conditioned space 2. This is because it is possible to exhaust the high-temperature air that has moved to and raised toward the ceiling plate 10 from the sub-exhaust port 20 to the outside of the air-conditioned space.

(Third embodiment)
When the replacement ventilation in the air-conditioned space is performed by a replacement ventilation system (hereinafter referred to as “third invention example”) that is partially different in configuration from the replacement ventilation system of the first embodiment described above, and the first implementation described above. The temperature distribution and air concentration in the air-conditioned space were measured when the replacement ventilation in the air-conditioned space was performed according to the comparative example described in the example.
The configuration of the measuring device used for measuring the temperature distribution in the air-conditioned space and the tracer gas concentration when the replacement ventilation in the air-conditioned space is performed by the replacement ventilation system of the third invention example will be described in the first embodiment described above. Since it is the same as that of the measuring apparatus when the replacement ventilation in the air-conditioned space is performed by the replacement ventilation system of the first invention example, the description thereof is omitted (see FIGS. 6 and 7).

Moreover, since the replacement ventilation system 1 of the third invention example has the same configuration as the replacement ventilation system of the first embodiment described above except that it does not have a secondary exhaust port, the description thereof is omitted (FIG. 1). To FIG. 3).
The size of the air-conditioned space 2, the floor board 4, the side walls 6 and the ceiling board 10 that form the air-conditioned space 2, and the illumination 12 attached to the lower surface of the ceiling board 10 are the same as those in the first embodiment described above. Is omitted.

Hereinafter, referring to FIG. 9 and FIG. 11, the temperature distribution and the tracer gas concentration in the conditioned space are measured using the replacement ventilation system of the third invention example and the ventilation system of the first invention example. The measurement environment and measurement conditions will be described.
In addition, since the measurement conditions in the third embodiment are the same as those in the first embodiment described above, description thereof is omitted.

  FIG. 11 is a diagram showing measurement results of temperature distribution and tracer gas concentration in the air-conditioned space 2 when the air-conditioned space 2 is ventilated by the replacement ventilation system 1 of the third invention example. In FIG. 11, as in FIG. 8, the temperature distribution in the conditioned space 2 is indicated by a plurality of types of hatching. Further, in FIG. 11, as in FIG. 8, the value obtained by making the air concentration in the conditioned space 2 dimensionless [%] with the complete mixed concentration is indicated by the numbers outside () indicated in the frame, and the conditioned space The tracer gas concentration [ppm] in 2 is indicated by the number in () described in the frame.

In FIG. 11, similarly to FIG. 8, low temperature air supplied from the air supply port 16 into the conditioned space 2 is indicated by an arrow “SA”, and exhaust from the main exhaust port 18 is indicated by an arrow “EA”. Show.
Moreover, the measurement of the temperature distribution and the tracer gas concentration in the air-conditioned space 2 when performing the replacement ventilation in the air-conditioned space 2 by the replacement ventilation system of the third invention example is performed under the conditions shown in Table 7 and Table 8 below. Do.

In addition, when performing the replacement ventilation in the conditioned space 2 by the ventilation system of the third invention example and the replacement ventilation system of the first invention example, the set temperature in the conditioned space 2 is set to 25.0 [° C.] The supply air temperature is set so that the sensible heat amount by supply air is the same in each case.
Hereinafter, referring to FIG. 9, the results of measuring the temperature distribution and the tracer gas concentration in the conditioned space 2 using the replacement ventilation system of the third invention example and the ventilation system of the first invention example, using FIG. 11. Will be described.

・ Temperature distribution As shown in FIGS. 9 and 11, in the ventilation by the ventilation system of the first invention example and the ventilation by the replacement ventilation system 1 of the third invention example, the temperature distribution in the work area includes: There is no significant difference. However, in the ventilation by the replacement ventilation system 1 of the third invention example, compared with the ventilation by the ventilation system of the first invention example, particularly in the temperature distribution near the exhaust hood 32, the high temperature region is reduced.

Tracer Gas Concentration In the third invention example shown in FIG. 11, the air concentration is lowered particularly at the height near the ceiling board 10 as compared with the first invention example shown in FIG. 9.
Further, in the third invention example, the tracer gas concentration at a height of 2050 [mm] from the upper surface of the floor plate 4 is higher than the tracer gas concentration at a height of 2450 [mm] from the upper surface of the floor plate 4. This is because most of the heat pool in the vicinity of the ceiling board 10 is due to the heat generated by the lighting 12, and the upward flow of hot air leaking from the exhaust hood 32 is caused by the sleeve wall 66 from the upper surface of the floor board 4 to 2050 It is because it is considered that it stagnates in the height of mm].
From the above measurement results, it was confirmed that the third invention example decreased in the high-temperature region, particularly in the temperature distribution near the exhaust hood 32, as compared with the first invention example. Thereby, it was confirmed that the third invention example can reduce the temperature of the space near the work area as compared with the first invention example.

DESCRIPTION OF SYMBOLS 1 Replacement ventilation system 2 Air-conditioning space 4 Floor board 6 Side wall 8 Frame ceiling 10 Ceiling board 12 Illumination 14 Heating source 14a IH range 14b Electric griddle 14c IH flyer 16 Air supply port 18 Main exhaust port 20 Sub exhaust port 22 Exhaust amount control means 24 Exhaust State control means 26 Air supply chamber 28 Hanging part 30 Ceiling space 32 Exhaust hood (plate materials 32a to 32c)
34 Outside air intake duct 36 Air conditioner 38 Air supply duct 40 Outside air amount control damper 42 Outside air state control means 44 Outside air intake amount control device 46 Outside air gallery 48 Supply air blower 50 Main exhaust duct 52 Main exhaust air volume control damper 54 Main exhaust air blower 56 Main Exhaust state control means 58 Main exhaust volume control device 60 Main exhaust gallery 62 Main exhaust port side filter 64 Grease filter 66 Sleeve wall 68 Sub exhaust duct 70 Sub exhaust air volume control damper 72 Sub exhaust fan blower 74 Sub exhaust state control means 76 Sub exhaust volume Control device 78 Secondary exhaust gallery 80 Secondary exhaust port side filter 82 Vertical wall 84 Supply port 86 Space temperature sensor 88 Surface temperature sensor 90 Tracer gas (SF ₆ ) generator 92 Disturbance generator 94 Pole 96 Tracer gas (SF ₆ ) concentration measurement Point SA Provided from the air inlet to the air-conditioned space Exhaust from the cold air EA outlet being

Claims (7)

Low-temperature air lower than the temperature in the air-conditioned space is supplied to the air-conditioned space surrounded by the floor plate, the side wall, and the ceiling plate arranged to be spaced downward from the housing ceiling, and higher than the low-temperature air. A replacement ventilation system that raises high-temperature air in the air-conditioned space and exhausts it outside the air-conditioned space to ventilate the air-conditioned space,
An air supply port for supplying the low-temperature air into the air-conditioned space, and a main exhaust port for exhausting the high-temperature air to the outside of the air-conditioned space,
The replacement ventilation system according to claim 1, wherein the air supply opening opens in a hanging portion that hangs down from the ceiling plate. The main exhaust port is covered with an exhaust hood that protrudes from the ceiling plate to the floor plate and forms a space between the main plate and the floor plate,
The sub-exhaust port that opens at a position between the air supply port and the exhaust hood in the ceiling plate and exhausts the high-temperature air to the outside of the air-conditioned space. Replacement ventilation system. An exhaust amount control means for controlling a ratio of an exhaust amount from the main exhaust port and an exhaust amount from the sub exhaust port;
The exhaust amount control means includes the exhaust amount from the main exhaust port and the exhaust amount so that the exhaust amount per unit time from the sub exhaust port is smaller than the exhaust amount per unit time from the main exhaust port. The replacement ventilation system according to claim 2, wherein a ratio with an exhaust amount from the secondary exhaust port is controlled.   When the exhaust amount from the main exhaust port is EA1 and the exhaust amount from the sub exhaust port is EA2, the EA1: EA2 is in a range of 19: 1 to 4: 1. 4. The replacement ventilation system according to claim 3, wherein the ratio of the exhaust amount from the main exhaust port and the exhaust amount from the sub exhaust port is controlled as described above. A heating source for increasing the temperature of the air in the air-conditioned space is arranged in the air-conditioned space,
Exhaust state control means for controlling the exhaust state from the main exhaust port and the sub exhaust port according to the operating state of the heating source;
The exhaust state control means controls the exhaust state so as to exhaust air from the main exhaust port and the sub exhaust port during operation of the heating source, and after the operating heat source is stopped. The exhaust state is controlled so that exhaust from the main exhaust port is stopped and exhaust from the secondary exhaust port is continued when a predetermined time elapses. A replacement ventilation system as described in 1 above.   The replacement ventilation system according to any one of claims 2 to 5, wherein the air supply opening opens above the lower end of the exhaust hood in the hanging portion.   The replacement ventilation system according to any one of claims 1 to 6, wherein the air supply opening opens on a lower surface of the hanging portion facing the floor plate.

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