JP2004016616A - Cabinet and panel system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cabinet for housing appliances producing heat such as electronic appliances capable of cooling all the appliances housed therein effectively and with little energy. <P>SOLUTION: A wagon 1 that is the cabinet for housing the appliances producing heat such as the electronic appliances comprises an air inlet 1a at the bottom surface thereof and an air outlet 1b above the air inlet 1a for exhausting air. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a storage furniture for storing equipment that generates heat and a panel system used with the storage furniture.
[0002]
[Prior art]
2. Description of the Related Art In recent years, with the spread of so-called IT technology, one or more personal computers (hereinafter, referred to as personal computers) have been used for each office space.
[0003]
As an example of the arrangement of the personal computer, a storage furniture for storing the personal computer is placed under the top plate of the work desk, and the main body of the personal computer is stored inside the storage furniture to effectively use the space on the top plate. Have been.
[0004]
On the other hand, heat is generated inside the personal computer because semiconductors etc. are arranged at high density in the personal computer body, especially when the personal computer is placed under the work table top or inside the storage furniture, the space below the top plate and Since the heat easily accumulates in the storage furniture, it is necessary to cool it effectively to prevent so-called thermal runaway. Also, if the air is constantly exhausted into the space below the tabletop, it may cause discomfort depending on the temperature of the person and the surroundings. Therefore, it has been considered to forcibly suck and exhaust air heated for cooling the PC body using a fan.
[0005]
[Problems to be solved by the invention]
However, if a fan is used to forcibly intake and exhaust air, energy is required to operate the fan, and the failure of the fan causes heat to be trapped in the storage furniture, causing the PC to easily run out of heat. Could be.
[0006]
If the air can be exhausted without using a fan and the air for cooling can be effectively taken in, the entire personal computer can be safely cooled with little energy.
[0007]
The above-mentioned problems can generally be present when housing not only personal computers but also other information devices and the like that generate heat and may cause so-called thermal runaway.
[0008]
Accordingly, the present invention solves the above-described problems and provides a means for introducing and exhausting air into a portion for accommodating a heat-generating device such as a personal computer with little energy.
[0009]
[Means for Solving the Problems]
That is, the storage furniture according to the present invention accommodates a device that generates heat, such as information equipment, in which an intake port is opened on the bottom surface and an exhaust portion is provided above the intake port to exhaust air. Is performed.
[0010]
In such a case, the air heated by the device that generates heat is discharged from above by the principle of natural convection, and the air for cooling is supplied from the air inlet provided on the bottom surface, so that less energy is required. Thus, it is possible to effectively cool the entire device that generates heat, such as a personal computer stored in the storage furniture. In addition, since heat is exhausted to an upper space where no person exists, the degree of discomfort to the person can be reduced.
[0011]
If the exhaust unit is provided on the back, a device such as a personal computer often has a built-in exhaust fan on the back, so that the function of this fan can be used and the device can be heated. It is possible to prevent the exhaust gas from being recirculated and sucked into devices such as a personal computer again.
[0012]
In the case of storage furniture with a shelf structure inside, in order to effectively cool the equipment placed on the shelf, the inside must be ventilated between the space under the shelf below the shelf and the space above the shelf above the shelf. What is necessary is just to make the shelf structure comprised possible. This is because air for cooling is introduced from the space under the shelf below the shelf to the space above the shelf above the shelf.
[0013]
In order to cool the equipment more effectively, punching holes may be provided in the shelf. This is because air is introduced from the punching hole below the device placed on the shelf, and the personal computer or the like can be cooled effectively.
[0014]
Even if a gap is formed between the front, side, or back of the shelf and the inner surface of the storage furniture, air is introduced from the gap below the equipment placed on the shelf, and the equipment can be more effectively removed. Can be cooled.
[0015]
In order to effectively cool the equipment while allowing the internal structure of the storage furniture to be flexibly changed, the height of the shelf is made variable, and the height of the shelf is varied. An opening for exhaust may be provided over the upper side.
[0016]
In order to allow air heated by a personal computer or the like to be selectively reused for partial heating for a person seated on the side of the storage furniture, exhaust openings are provided at two locations and exhaust at these two locations is provided. What is necessary is just to provide the exhaust part closing means comprised so that the ratio of the exhaust from the part could be selected. With such a configuration, one of the two exhaust portions is opened toward the occupant, so that personal local heating can be performed by flowing the exhaust toward the occupant. It is.
[0017]
In order to effectively use the air from an air conditioning system having an air conditioning outlet on the floor, the air inlet is disposed above the air conditioning outlet, and exhaust leakage is caused between the air inlet and the air conditioning outlet. What is necessary is just to interpose a prevention member. This is because the air from the air conditioning system is sent to the intake port without leaking to the outside by the exhaust leak prevention member.
[0018]
Furthermore, if the storage furniture is provided with a caster at the lower end and is movable, the office layout can be easily changed when used in an office or the like.
[0019]
Furthermore, a frame member and a panel including a panel element having a plate surface and attached to the frame member are used to secure an exhaust passage in the panel or between the panels, and to store the storage furniture in the panel. A panel system that is disposed in front or rearward of the panel and has an exhaust circulation port that is continuous with the rear exhaust port provided in the storage furniture in the panel element, and further includes an upper exhaust portion in the panel together with such storage furniture. If used, the exhaust from the interior of the storage furniture can be effectively exhausted using the principle of natural convection.
[0020]
If it is configured so that the top plate can be arranged above the storage furniture, it is possible to carry out work while realizing a configuration in which air heated by information equipment or the like and discharged from the storage furniture is hardly trapped below the top plate. Storage furniture containing information equipment etc. can be arranged below the top plate to be used.
[0021]
Furthermore, in order to prevent air heated by information equipment or the like from trapping below the top plate, an exhaust leakage prevention member may be interposed between the rear exhaust port and the exhaust circulation port.
[0022]
Further, in such a panel system, in order to allow air heated by a personal computer or the like to be reused for partial heating, a lower exhaust portion is provided on the opposite side of the frame member of the panel element provided with the exhaust circulation port. It is only necessary to provide a panel element having the above-mentioned structure and to allow ventilation from the exhaust port of the storage furniture to the lower exhaust section. This is because, by arranging the storage furniture alternately with the panel interposed therebetween, the partial heating can be performed by taking in the exhaust air from the storage furniture on the opposite side across the panel.
[0023]
In order to adjust the partial heating as required, the ratio between the amount of exhaust from the upper exhaust portion and the amount of exhaust from the lower exhaust portion may be made variable.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described.
[0025]
The wagon 1 as the storage furniture according to the present embodiment is arranged in front of or behind a low partition LP as a panel system formed by using the panel 2 as shown in a plan view in FIG. 1 and a front view in FIG. use.
[0026]
More specifically, the wagon 1 has information inside as shown in FIG. 3 for the front view, FIG. 4 for the rear view, FIG. 5 for the bottom view, FIG. 6 for the cross-sectional view, and FIG. The wagon main body 11, a shelf board 12 mounted inside the wagon main body 11, and a front door 13 which forms the front surface of the wagon main body 11 and is configured to be openable and closable. I have. FIG. 8 shows a front view in a state where the front door 13 is removed. The wagon body 11 is further attached to a top plate 111 forming an upper surface, a pair of side plates 112 forming both side surfaces, a back plate 113 forming a back surface, a bottom plate 114 forming a bottom surface, and a lower end portion. And a caster 115. One side plate 112 is provided with a wiring insertion port 1x for inserting a power cord of an information device PC or the like housed therein. On the inner surface of the side plate 112, a plurality of shelf mounting slits 12a formed in front and rear are provided in a vertical direction, and the shelf 12 is connected to the shelf mounting slit 12a and the shelf mounting member 121 through the shelf mounting slit 12a. The height position can be changed. The width of the shelf 12 is approximately equal to the dimension between the shelf mounting slits 12a, and the depth is smaller than that of the wagon body 11. Further, the front door 13 is attached to the wagon body 11 by a hinge (not shown), and a packing (not shown) is provided on an outer peripheral portion on a back surface of the front door 13 so that air heated by the information equipment causes the front door 14 and the wagon body 11 to communicate with each other. It is configured not to leak from the space between them. In this embodiment, a handle 131 to be gripped at the time of opening and closing and a window 132 for checking the inside are provided on the front surface of the front door 13. The window 132 is made of, for example, a transparent material such as glass.
[0027]
Thus, the bottom plate 114 of the wagon body 11 is provided with the intake port 1a opened. That is, an intake port 1a is provided on the bottom surface of the wagon 1 so as to open. On the other hand, a wagon exhaust port 1b, which is an exhaust unit, is provided in the upper part of the back plate 113 so as to be opened. The upper end of the wagon exhaust port 1b is higher than the upper end of the variable area at the height of the shelf plate 12. . That is, the air heated by the information equipment PC rises and is discharged from the wagon exhaust port 1b, and new air for cooling is taken in from the intake port 1a.
[0028]
Further, a recess is provided at a substantially central portion in the depth direction of the side plate 112, and the shelf board mounting slit 12a is provided outside the recess. Further, as described above, the width dimension of the shelf board 12 is made substantially equal to the dimension between the shelf board mounting slits 12a. Therefore, there is a gap 12s1 between the shelf plate 12 and the side plate 112. Further, as described above, since the depth of the shelf 12 is smaller than that of the wagon body 11, there is a gap 12s2 between the shelf 12 and the back plate 113, and the gap between the shelf 12 and the front door 13 is large. There is a gap 12s3 between them. These gaps 12s1, 12s2, and 12s3 allow air to flow between the space under the shelf 12 and the space above the shelf 12 above the shelf.
[0029]
In the present embodiment, the wagon 1 is used together with an air conditioning system having an air conditioning outlet AC on the floor, and the air inlet 1a is arranged above the air conditioning outlet AC, and the air is exhausted around the air inlet 1a. An intake side packing 14 serving as a leak prevention member is provided so that the intake side packing 14 comes into close contact with the floor surface. That is, the intake-side packing 14 is interposed between the intake port 1a and the air-conditioning outlet AC, so that the air from the air-conditioning outlet AC is introduced into the intake port 1a without leakage.
[0030]
Further, an exhaust gasket 15 is provided around the wagon exhaust port 1b as an exhaust leakage prevention member so as to be in close contact with the panel 2 as described later.
[0031]
On the other hand, the low partition LP has a plurality of panels 2 in the width direction as shown in FIG. 1 in a plan view, FIG. 2 in a front view, FIG. 9 in a perspective view, and FIG. It is configured by connecting individual pieces. The panel 2 includes a frame member 21, various panel elements 22 attached to the front or rear surface of the frame member 21, a width plate 23 attached to a lower end of the frame member, and a cap plate 24 attached to an upper end of the frame member. I do. The frame member 21 includes a column 211 and a horizontal beam 212 provided between the columns. The depth of the cross beam 212 is smaller than the depth of the column 211, and a space is provided between the horizontal beam 212 and the panel element 22. The panel element 22 has substantially the same width dimension as the frame member 21, and is attached through, for example, a hook hole (not shown) provided in the frame member 21. Further, in the present embodiment, a panel element 22 having a glass window 2x on the top is attached. In the present embodiment, furthermore, two panels 2 are attached orthogonally to both ends of the panel 2 connected in the width direction so as to form a flat H-shape in plan view as a whole. A desk 4 is further attached to one end, for example, by attaching one end edge to the panel 2 and fixing the desk 4 to the panel 2 via a bracket 41.
[0032]
Further, the wagon 1 is arranged in front of or behind the panel 2 constituting the low partition LP. More specifically, as shown in FIG. 1, the wagons 1 are arranged so as to be staggered. The panel element 22 facing the wagon 1 is provided with an exhaust flow opening 2a at a position facing the wagon exhaust port 1b. In addition, as described above, the exhaust-side packing 15 serving as an exhaust leakage prevention member is provided around the wagon exhaust port 1b, and the exhaust-side packing 15 is interposed between the wagon exhaust port 1b and the exhaust flow port 2a. The air heated by the information equipment PC or the like in the wagon 1 is discharged to the space between the panel elements 22 without leaking to the outside. The space between the front and rear panel elements 22 is used as an exhaust passage, and a punching hole is provided in the cap plate 24 to form an upper exhaust portion 2b. Here, the width dimension of the wagon exhaust port 1b is larger than the width dimension of the exhaust flow port 2a.
[0033]
Here, in this embodiment, the width used by one person is twice the width of the panel 2, and the top plate 3 is attached to the front and rear surfaces of the panel 2 connected in the width direction at approximately the center in the height direction. At the same time, a top plate support leg 32 is attached and supported below the top plate 3. Further, the wagon 1 is stored below the top plate 3, that is, the top plate 3 is arranged above the wagon 1, and two panels 2 are provided in a section for one person. The panel 2 has a panel element 22 provided with an exhaust passage 2a. The other panel 2 has a panel element 22 provided with an opening in the lower exhaust portion 2c, and discharges the exhaust gas heated by the information equipment PC or the like and discharged from the exhaust passage 2a through the lower exhaust portion 2c. It is also possible to blow out. Note that a partition 33 shown by imaginary lines in FIG. 9 can be attached to the upper surface of the top plate 3 as necessary.
[0034]
As shown in FIG. 10, the ratio of the discharge of the exhaust gas from the exhaust passage 2a can be adjusted by a butterfly valve 25. FIG. 11 is an enlarged view of the vicinity of the butterfly valve 25. The butterfly valve 25 is mounted inside the panel 2 and is configured to be movable between a fully closed position shown by a solid line in FIGS. 10 and 11 and a fully open position shown by an imaginary line in FIG. That is, when the butterfly valve 25 is at the fully closed position, all of the exhaust gas from the exhaust passage 2a flows to the upper exhaust portion 2b as shown by the arrow a in FIG. On the other hand, when the butterfly valve 25 is at the fully open position, all of the exhaust gas from the exhaust passage 2a flows to the lower exhaust portion 2c as shown by the arrow b in FIG. Further, although not shown, the butterfly valve 25 is set at a position between the fully closed position and the fully opened position, and a part of the exhaust gas from the exhaust passage 2a flows to the upper exhaust portion 2b, and the rest is the lower exhaust portion. It can also be made to flow to the part 2c.
[0035]
As described above, the intake port 1a is provided on the bottom surface of the wagon 1 while being opened, and the wagon exhaust port 1b is provided on the back surface so as to exhaust air from above, so that warm air is discharged from above. At the same time, since air for cooling is taken in from the air inlet 1a on the bottom surface, the entire information equipment PC and the like can be effectively cooled with a small amount of energy using the principle of natural convection.
[0036]
In addition, since the inside has a shelf structure, and ventilation is possible between the space under the shelf and the space above the shelf, the information equipment can be stably placed, and air can be sent from the space under the shelf to effectively cool. In particular, the shelf mounting hook 121 is provided so as to protrude from the side plate 112 of the wagon body 11, and the gap 1s1 is provided between the shelf 12 and the side plate 112, thereby effectively cooling the information equipment PC or the like with a simple configuration. be able to.
[0037]
Furthermore, since the height position of the shelf 12 can be changed, the internal configuration can be made to correspond to various modes, and the upper end of the wagon exhaust port 1b is moved from the variable region of the height position of the shelf 12 The air warmed by the information equipment PC or the like can be reliably exhausted because the air conditioner is also upward.
[0038]
On the other hand, the wagon 1 configured as described above is disposed in front of or behind a low partition LP configured by using a panel 2 configured by attaching various panel elements 22 to both front and rear surfaces of a frame member 21 and faces the wagon 1. An exhaust flow opening 2a is provided at a position facing the wagon exhaust opening 1b of the panel element 22 to be opened, and an upper exhaust portion 2b is provided above the panel 2 by using a space between the front and rear panel elements 22 as an exhaust passage. Since it is provided and the air is exhausted from the upper exhaust portion 2b, the exhaust from the wagon 1 can be effectively exhausted using the principle of natural convection. In the present embodiment, the width of the wagon exhaust port 1b is larger than the width of the exhaust circulation port 2a. Therefore, even if the position of the wagon 1 in the width direction is shifted, exhaust gas is supplied to the exhaust circulation port 2a. Can be shed.
[0039]
In particular, since the exhaust-side packing 15 is interposed between the wagon exhaust port 1b of the wagon 1 and the exhaust flow port 2a of the panel element 22, the exhaust from the wagon 1 can be prevented from leaking outside.
[0040]
A panel element 22 provided with a lower exhaust portion 2c is provided on the opposite side of the panel element 22 provided with the exhaust flow opening 2a with the frame 21 interposed therebetween. Since it is also possible to blow out from 2c, the exhaust from wagon 1 can be reused for step heating.
[0041]
In addition, since the ratio of the amount of exhaust from the upper exhaust part 2b and the lower exhaust part 2c can be adjusted using the butterfly valve 25, the intensity of underfloor heating can be adjusted as needed.
[0042]
In addition, if comprised like the above-mentioned embodiment, if the person who sat on the opposite side across the panel 2 does not use the equipment in the wagon 1, step heating cannot be used. In order to solve this problem and to surely reuse the exhaust gas from the wagon 1 for step heating, the wagon 1 may be configured as in the embodiment described below.
[0043]
As shown in FIG. 12, the wagon 1 according to this embodiment is provided with a second wagon exhaust port 1c as a second exhaust unit on the side surface, in addition to the configuration described in the above embodiment, and a wagon exhaust port 1b. A shutter 16 is provided as an exhaust port closing means configured to be able to select a ratio between an exhaust amount from the exhaust port and an exhaust amount from the second wagon exhaust port 1c. When the user is sitting on the side provided with the second wagon exhaust port, the amount of exhaust received by the occupant himself can be easily adjusted by operating the shutter 16. However, in the case of such a configuration, when foot heating is used, the amount of air exhausted from the rear wagon exhaust port 1b is reduced, and it is difficult to use the function of the fan that exhausts to the rear built in the device inside the wagon 1. Therefore, the efficiency of cooling the equipment inside the wagon 1 due to the recirculation of the heated exhaust gas may be reduced.
[0044]
Further, as shown in FIG. 13, two panels 2 each having the panel element 22 attached to only one surface of the frame member 21 may be superposed and arranged, and a space between the panels 2 may be used as an exhaust passage. In this case, a cap plate 24 having a width of two panels is used, and the cap plate 24 is provided with a punching hole as in the above-described embodiment. Further, a cross beam 213 having substantially the same depth dimension as the column 211 may be used for the frame member 21.
[0045]
Further, a punching hole may be provided in the shelf 12. In this way, air is introduced into the periphery of the information device PC or the like through the punching holes provided in the shelf 12 on which the information device PC or the like is placed, and the information device PC or the like can be cooled more effectively. In addition, when a punching hole is provided in the shelf 12, since air is introduced through the punching hole, it is not necessary to provide a gap around the shelf 12.
[0046]
Various other configurations are also conceivable. For example, the number of panels to be connected may not be six, and the arrangement of the panels may be other than the above-described embodiment.
[0047]
In addition, a configuration is also conceivable in which the panel is brought into close contact with a wall surface and exhaust from the wagon is exhausted from an upper exhaust portion provided above.
[0048]
Further, an outlet serving as a power supply for information equipment or the like may be provided inside.
[0049]
On the other hand, instead of providing the air inlet above the air-conditioning air outlet provided on the floor, a gap is provided between the bottom surface of the bottom plate provided with the air inlet and the floor, and the air inlet is placed on a flat floor surface. A configuration in which air is taken in from below may be considered.
[0050]
In addition, instead of providing a punching hole in the cap plate, a hole or opening of another shape is provided to form an upper exhaust portion, or an opening such as a cutout is provided in a panel element located at an upper portion. An embodiment in which an exhaust portion is formed is also conceivable.
[0051]
Then, the exhaust gas leakage member may be omitted by preventing the exhaust gas from leaking by another method such as a configuration in which the back plate of the wagon and the panel element can be in close contact with each other.
[0052]
In addition, wagons configured to be movable by providing casters at the lower end as storage furniture have been described above. Similarly, storage furniture that is not movable is also provided with an intake port opened on the bottom surface, and an exhaust section is provided. The same effect can be obtained by providing and exhausting from above. In addition, various modifications can be made without departing from the spirit of the present invention.
[0053]
【The invention's effect】
The present invention is a storage furniture for storing therein a device that generates heat such as an information device, and has an intake port opened at the bottom and is configured to exhaust air from above, so that heat is generated. The air warmed by the accompanying equipment is discharged from above by the principle of natural convection, and the air for cooling is supplied from the intake port provided on the bottom surface, effectively cooling information equipment etc. stored with little energy can do.
[Brief description of the drawings]
FIG. 1 is a plan view showing a state in which a wagon and a low partition according to an embodiment of the present invention are combined.
FIG. 2 is an exemplary front view showing a state where the wagon and the low partition according to the embodiment are combined;
FIG. 3 is an exemplary front view showing the wagon according to the embodiment;
FIG. 4 is an exemplary rear view showing the wagon according to the embodiment;
FIG. 5 is a bottom view showing the wagon according to the embodiment.
FIG. 6 is a transverse sectional view of the wagon according to the embodiment.
FIG. 7 is a vertical sectional view of the wagon according to the embodiment.
FIG. 8 is a front view showing a state where the front door of the wagon according to the embodiment is removed.
FIG. 9 is an exemplary perspective view showing a low partition according to the embodiment;
FIG. 10 is a vertical sectional end view showing a state where the wagon and the low partition according to the embodiment are combined.
FIG. 11 is an enlarged view of the vicinity of a butterfly valve in FIG. 10;
FIG. 12 is a view showing a wagon according to another embodiment of the present invention.
FIG. 13 is a sectional end view of the same portion as FIG. 10 in another embodiment of the present invention.
[Explanation of symbols]
1. Wagon (storage furniture)
1a: intake port 1b: wagon exhaust port (exhaust part)
1c: 2nd wagon exhaust port (exhaust section)
115 ... Caster 12 ... Shelf 14 ... Intake side packing (Exhaust leakage prevention member)
15 Exhaust side packing (Exhaust leakage prevention member)
16. Shutter (exhaust section closing means)
2 Panel 2a Exhaust flow opening 2b Upper exhaust part 2c Lower exhaust part 21 Frame member 22 Panel element 3 Top plate LP Low partition (panel system)

Claims (14)

A device that generates heat, such as information equipment, is housed therein, and an intake port is opened on the bottom surface, and an exhaust unit is provided above the intake port to exhaust air. Storage furniture characterized by that. The storage furniture according to claim 1, wherein the exhaust unit is provided on a back surface. The storage furniture according to claim 1 or 2, wherein the interior has a shelf structure configured to allow ventilation between a space under the shelf below the shelf and a space above the shelf above the shelf. The storage furniture according to claim 3, wherein a punching hole is formed in the shelf board. The storage furniture according to claim 3, wherein a gap is formed between a front surface, a side surface, or a rear surface of the shelf board and an inner surface of the storage furniture. The height position of the shelf plate can be changed, and an opening for exhaust as an exhaust portion exists above the upper end of a variable region of the shelf plate height position. Or the storage furniture according to 5. The exhaust portion is provided with openings at two locations, and exhaust portion closing means configured to vary the proportion of exhaust from the two exhaust portions is provided. The storage furniture according to 5, 6 or 7. Used together with an air conditioning system having an air conditioning outlet on the floor, the intake port is arranged above the air conditioning outlet, and an exhaust leak prevention member is interposed between the intake port and the air conditioning outlet. The storage furniture according to claim 1, 2, 3, 4, 5, 6, or 7. The storage furniture according to claim 1, 2, 3, 4, 5, 6, 7, or 8, wherein a caster is provided at a lower end portion so as to be movable. A panel for use with the storage furniture according to claim 1, 2, 3, 4, 5, 6, 7, 8, or 9, comprising a frame member, and a panel element having a plate surface and attached to the frame member. It is configured using, and while securing an exhaust passage in the panel or between the panels, the storage furniture is disposed in front of or behind the panel, and an exhaust circulation port connected to the exhaust unit provided in the storage furniture. A panel system comprising: a panel element; and an upper exhaust portion provided on the panel. The panel system according to claim 10, wherein a top plate can be arranged above the storage furniture. The panel system according to claim 10, wherein an exhaust leakage prevention member is interposed between the exhaust part and the exhaust passage. A panel element having a lower exhaust portion is provided on the opposite side of the frame member of the panel element provided with the exhaust circulation port, and the ventilation device is configured to be able to vent from the exhaust portion of the storage furniture to the lower exhaust portion. The panel system according to claim 12, wherein 14. The panel system according to claim 13, wherein a ratio between an exhaust amount from the upper exhaust unit and an exhaust amount from the lower exhaust unit is configured to be variable.

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