JP2007155330A - Air supply chamber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air supply chamber for replacement ventilation capable of reducing discomfort by a draft, and reducing a difference of upper and lower temperatures in a living area without increasing facility cost. <P>SOLUTION: The air supply chamber 20 for supplying low temperature air to an inside of an air conditioned space 10 where replacement ventilation is conducted, is provided with air supply ports 15 of the low temperature air formed on a front surface. A fin 30 for feeding a swirling component to the low temperature air is provided on the air supply ports 15. The swirling components of the low temperature air blown out from the adjacent air supply ports 15 form mutually opposite rotation directions. When the swirling components are given to the low temperature air SA blown out in the air conditioned space 10, induced volume of air (an induced rate) in the air conditioned space 10 induced by the blown-out low temperature air SA can be increased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air supply chamber for replacement ventilation.

  For example, a displacement ventilation system (Displacement Ventilation System) is known as a ventilation system for ventilating an air-conditioned space such as a living room. In this replacement ventilation system, air that is slightly lower than room temperature is supplied to the lower part of the air-conditioned space (for example, a living area) at a slow air supply speed (generally 0.2 m / s or less), and the air is air-conditioned. Contaminants such as dust and gas generated in the air-conditioned space are conveyed upward in the air-conditioned space by the upward flow generated by heating by a heating element or the like existing in the space. Then, the air-conditioning space is ventilated by exhausting the pollutant together with the heated air from an exhaust port provided on the ceiling or the like.

  In such a replacement ventilation system, a region having a high pollutant concentration at a high temperature is formed above the air-conditioned space. By sequentially extruding with low-temperature air supplied into the air-conditioned space, Air with high pollutant concentration is exhausted without stirring, so the lower part of the air-conditioned space is maintained in a clean environment, and the temperature in the air-conditioned space is maintained within a comfortable range without lowering the supply air temperature. There is an advantage that can be done. Thus, the replacement ventilation system is expected as an air conditioning system capable of energy saving and high ventilation efficiency operation.

  By the way, in this replacement ventilation system, as shown in FIG. 13, the supply air (cold air) SA supplied to the supply chamber 101 through the supply duct 100 is formed in a number of ways formed on the front surface of the supply chamber 101. Air is supplied into the air-conditioned space from the air supply port 102. The low-temperature air thus supplied is lowered in the floor direction due to a buoyancy difference due to a temperature difference from the indoor air, and generates a draft 103 that flows along the floor. May cause discomfort. Therefore, in the conventional replacement ventilation system, the speed of the low-temperature air blown out from the air supply port 102 into the air-conditioned space is suppressed to about 0.2 m / s or less, and the speed of the draft 103 is made as small as possible.

  However, the slower the low-temperature air blowing speed is, the larger the total area of the large air supply chamber 101 and the large air supply port 102 is required in order to obtain a predetermined air supply amount. In some cases, the cost increases, and it is sometimes difficult to secure a place for installing the large supply chamber 101.

  In addition, due to installation space restrictions, for example, as shown in FIG. 14, when a plurality of supply chambers 101 are installed adjacent to each other without being isolated, low-temperature air is supplied from the supply ports 102 of each supply chamber 101. The drafts 103 formed in this manner flow parallel to each other and do not spread radially, but flow over the floor. Therefore, the attenuation distance of the draft 103 becomes long, and there is a concern that an uncomfortable area that makes the draft 103 feel underneath is widened.

  Furthermore, in the replacement ventilation system, in order to reduce the temperature difference between the top and bottom in the air-conditioned space, it is necessary to increase the air volume of the low-temperature air blown from the air supply port and reduce the temperature difference between the supply and exhaust air. There was a concern of further increasing discomfort due to.

  Accordingly, an object of the present invention is to provide a replacement ventilation air supply chamber that can further reduce discomfort due to the draft without increasing the equipment cost, and can reduce the difference in vertical temperature in the living area.

  In order to achieve this purpose, a replacement ventilation system that ventilates by supplying low-temperature air into an air-conditioned space and exhausting the heated air that has been heated and raised in the air-conditioned space. A replacement ventilation system is provided which is characterized in that it is supplied and blown into an air-conditioned space.

  When the low-temperature air is blown into the air-conditioned space, an attraction action in which the air in the air-conditioned space is attracted by the blown-out low-temperature air and moves together. According to this replacement ventilation system, the amount of attraction (attraction ratio) of air in the air-conditioned space that is attracted by the blown-out low-temperature air amount can be increased by giving a swirl component to the low-temperature air that is blown out into the air-conditioned space. . As the amount of attraction increases in this way, the speed of the low-temperature air is reduced according to the momentum conservation law, and the speed is quickly reduced. Further, as the amount of attraction increases, the temperature of the low-temperature air can be quickly raised, and the difference in the upper and lower temperature in the air-conditioned space can be further reduced. In this way, the air-conditioned space can be efficiently air-conditioned with as little airflow as possible, contributing to energy saving.

  In this replacement ventilation system, it is preferable to provide a fin for giving a swirl component to the low-temperature air at the low-temperature air supply port. If it does so, a swirl component can be given easily and cheaply with respect to the low-temperature air which blows off in an air-conditioned space from an air supply port.

Further, when a plurality of low-temperature air supply ports are arranged side by side, the swirl components of the low-temperature air blown out from the adjacent air supply ports are preferably in a relation in which the rotation directions are opposite to each other. Then, the swirling motion of the low-temperature air blown out from the adjacent air supply ports encourages each other, and the amount of air in the air-conditioned space that is attracted by the amount of low-temperature air blown out from the air supply port is further increased. Can be increased.
According to the present invention, an air supply chamber that supplies low-temperature air into an air-conditioned space in which replacement ventilation is performed, and an air supply port for low-temperature air is provided on the front surface. A replacement ventilation air supply chamber is provided in which fins for providing a swirl component are provided, and swirl components of low-temperature air blown out from adjacent air supply ports are in opposite rotation directions.
In this air supply chamber, the air supply space may be provided at the lower part of the side surface of the air-conditioned space with the front surface exposed at the lower part of the side surface of the air-conditioned space. Further, a plurality of air supply ports may be arranged side by side on the front surface. Further, a plurality of air supply ports may be provided on the front surface, and inclined fins may be attached to the respective air supply ports, and the inclination directions of the fins of adjacent air supply ports may be opposite to each other.

  According to the present invention, replacement ventilation with less draft feeling can be realized by using a compact air supply unit or the like. The downsizing makes it less likely to be constrained by the installation location of the air supply unit and the like, and the equipment cost can be reduced. Moreover, since the air in the air-conditioned space is attracted and mixed, the difference in temperature between the upper and lower sides of the living area can be kept in a comfortable range with a smaller air volume than before, which can contribute to energy saving.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram for explaining a replacement ventilation system 1 according to an embodiment of the present invention.

  The air-conditioned space 10 is, for example, an office room, a computer room, a guest room, a banquet hall, a game room, a printing room, a hospital room, a toilet, a kitchen, a machine room, a boiler room, a factory, and the like, and is partitioned by a ceiling, a floor, and a side wall. . For example, a human 11 exists as a heating element in the air-conditioned space 10. An air supply port 15 is provided in the lower part of the air-conditioned space 10, and an exhaust port 16 is provided in the upper part of the air-conditioned space 10. In the illustrated example, an air supply port 15 is opened at a lower portion of one side surface (one side wall of a room forming the air conditioned space 10) 17 and an exhaust port 16 is opened at an upper portion. ing. An air supply chamber 20 is provided on the lower back side of one side surface 17 of the air-conditioned space 10, and a front surface 21 of the air supply chamber 20 is exposed below the one side surface 17 of the air-conditioned space 10.

  As shown in FIG. 2, a plurality of air supply ports 15 are arranged vertically and horizontally on the front surface 21 of the air supply chamber 20 exposed in the lower portion of the side surface 17 of the air-conditioned space 10. The air supply chamber 20 is supplied with low-temperature air SA produced by taking the outside air OA into the air conditioner 22 via the air supply duct 23. Thereby, the low temperature air SA is supplied toward the inside of the air-conditioned space 10 from the plurality of air supply ports 15 formed in the front surface 21 of the air supply chamber 20. The air conditioner 22 includes a cooler 25 and a filter (not shown) for cooling the outside air OA to produce the low-temperature air SA, and the low-temperature air SA thus produced is supplied to the air supply duct 23 and the air supply chamber 20. And an air supply fan 27 that is supplied into the air-conditioned space 10.

  As shown in FIGS. 3 and 4, each air supply port 15 is provided with a blowing member having a plurality of fins 30. A support member 31 is provided at the center of each air supply port 15. Although not shown, the support member 31 is fixed to the air supply chamber 20. The fins 30 are radially attached around the support member 31 at appropriate equal intervals. In addition, each fin 30 is arranged to be inclined with respect to the central axis 15 ′ of the air supply port 15 in order to give a swirling component to the low temperature air SA blown out from the air supply port 15 toward the inside of the air-conditioned space 10. 3 and 4, the inclination directions of the fins 30 are opposite to each other.

  As described above, the fins 30 inclined to the air supply ports 15 are attached in a radial manner, so that the low-temperature air SA that has flowed from the inside of the air supply chamber 20 toward the air supply port 15 passes through the air supply ports 15. In doing so, it can be forced to flow along each fin 30. Thereby, the swirl component centering on the central axis 15 ′ is given to the low temperature air SA blown out from the air supply port 15 toward the air-conditioned space 10.

  Here, in FIGS. 3 and 4, the inclination directions of the fins 30 are opposite to each other with respect to the above-described blowing member, and depending on the fins 30 shown in FIG. When the front surface 21 of 20 is viewed from the indoor side of the conditioned space 10, a swirl component in the counterclockwise direction is given to the low temperature air SA. On the other hand, depending on the fin 30 shown in FIG. 4, when the front surface 21 of the air supply chamber 20 is viewed from the indoor side of the air-conditioned space 10 when passing through the air supply port 15, the swirl component in the clockwise direction has a low temperature. Given to the air SA.

  As described above, a plurality of air supply ports 15 are arranged vertically and horizontally on the front surface (surface inside the room forming the air-conditioned space 10) 21 of the air supply chamber 20. The swirl components of the low-temperature air SA blown out from the mouth 15 are in the relationship of the rotation directions opposite to each other. That is, for example, as shown in FIG. 5, four air supply ports 15a, 15b, 15c, and 15d arranged in the vertical direction will be described as an example. The first air supply port 15a and the third air supply port from the top. In 15c, the inclination direction of the fin 30 is the state described with reference to FIG. 3, and low-temperature air SA to which a swirling component in the counterclockwise rotation direction is blown out from the air supply port 15a and the air supply port 15c. On the other hand, in the second air supply port 15b and the fourth air supply port 15d from the top, the inclination direction of the fin 30 is the state described in FIG. 4, and the air supply port 15b and the air supply port 15d The low-temperature air SA given the swirl component in the rotation direction is blown out. In this way, the low temperature air swirling in the opposite rotation directions between the adjacent air supply port 15a and the air supply port 15b, between the air supply port 15b and the air supply port 15c, and between the air supply port 15c and the air supply port 15d, respectively. SA is blown out.

  That is, as shown in FIG. 6, the low-temperature air SA that swirls in the same rotational direction from the four air supply ports 15a, 15b, 15c, and 15d aligned in the vertical direction (in the example shown in FIG. When low temperature air SA) swirling in the rotation direction is blown out, between the air supply port 15a and the air supply port 15b, between the air supply port 15b and the air supply port 15c, and between the air supply port 15b and the air supply port 15c. Then, the low temperature air SA is blown out in a direction that cancels each other. If it does so, the swirl component of the low-temperature air SA which blows off from each air supply opening 15a, 15b, 15c, 15d will be canceled.

  On the other hand, as described with reference to FIG. 5, if the swirl components of the low-temperature air SA blown from the air supply ports 15a, 15b, 15c, and 15d are alternately reversed, the air supply ports 15a and 15b Since the low-temperature air SA is blown out in the same direction between the air supply port 15b and the air supply port 15c and between the air supply port 15b and the air supply port 15c, each air supply port The swirling components of the low-temperature air SA blown out from 15a, 15b, 15c, and 15d are not cancelled, and the swirl motions are promoted with each other.

  In FIG. 5, the relationship between the upper and lower air supply ports 15 has been described. However, as described above with reference to FIG. 2, a plurality of air supply ports 15 are vertically and horizontally arranged on the front surface 21 of the air supply chamber 20. They are arranged side by side. Therefore, the swirl components of the low-temperature air SA blown from the adjacent air supply ports 15 are not only between the air supply ports 15 arranged vertically but also between the air supply ports 15 arranged horizontally. The inclination direction of the fins 30 provided in each air supply port 15 is set so as to have a reverse rotational direction relationship.

  As shown in FIG. 1, an exhaust duct 41 including an exhaust fan 40 is connected to the exhaust port 16 disposed in the upper part of the air-conditioned space 10. As a result, air accumulated in the upper part of the air-conditioned space 10 (air heated by a heat load such as a human body or OA equipment existing in the air-conditioned space 10) is exhausted EA to the outside through the exhaust duct 41. It has become.

  In the replacement ventilation system 1 configured as described above, the low-temperature air SA produced by the air conditioner 22 is moved into the air-conditioned space 10 through the air supply duct 23 and the air supply chamber 20 by the operation of the air supply fan 27. Supply. When passing through the air supply port 15, a swirl component is given to the low-temperature air SA by the fins 30 attached to the air supply port 15, and thus from the air supply ports 15 toward the air-conditioned space 10. The low temperature air SA is supplied while turning.

  Then, the attracting action in which the air in the air-conditioned space 10 is attracted to the low-temperature air SA blown out from each air supply port 15 and moves together. In this case, in the illustrated replacement ventilation system 1, the swirl component is given to the low-temperature air SA blown from the air supply port 15, so the amount of air that is attracted by the low-temperature air SA (attraction ratio) ) Will increase. Along with this, the speed of the low-temperature air SA is promptly decelerated after being blown out from each air supply port 15 in accordance with the momentum conservation law.

  The low-temperature air SA thus supplied into the air-conditioned space 10 flows downward in the air-conditioned space 10 due to a temperature difference, fills the living space below the air-conditioned space 10 at a low speed, and fills the living space. It is possible to maintain a comfortable environment.

  On the other hand, in the living space in the air-conditioned space 10, for example, a human 11 or the like as a heating element exists, so that it is supplied into the air-conditioned space 10 and is in thermal contact with the human 11 or other heat generating devices. The low-temperature air SA is heated and gradually rises. Due to the upward flow, contaminants such as dust and gas generated around the person 11 in the air-conditioned space 10 can be conveyed upward in the air-conditioned space 10.

  And the air (heated air) collected in the upper part of the air-conditioned space 10 is not agitated, that is, without disturbing the temperature stratification such as the living space formed in the air-conditioned space 10 and Exhaust air EA is exhausted to the outside of the exhaust fan 40 through the exhaust duct 41. In this way, ventilation of the air-conditioned space 10 is performed by exhausting contaminants such as dust and gas together with heated air from the upper part of the air-conditioned space 10 while supplying the low-temperature air SA downward in the air-conditioned space 10. The lower part in the air-conditioned space 10 is kept in an environment of clean low-temperature air SA.

  According to this replacement ventilation system 1, since the swirl component is given to the low temperature air SA supplied into the air-conditioned space 10, the low temperature air SA quickly decelerates after blowing out from each air supply port 15. Thus, it is possible to make it difficult for the person 11 in the living space in the air-conditioned space 10 to feel the draft. Further, the amount of higher-temperature ambient air (air in the air-conditioned space 10) attracted to the low-temperature air SA blown out from the air supply port 15 increases, and the temperature difference between the low-temperature air SA and the ambient air quickly increases. It becomes small, and it becomes possible to make the upper and lower temperature difference in the living space in the air-conditioned space 10 smaller.

  As described in this embodiment, the swirl components of the low-temperature air SA blown out from the adjacent air supply ports 15 in the plurality of air supply ports 15 formed in the front surface 21 of the air supply chamber 20 are opposite to each other. If the rotational direction of the air is set to be the same, the swirling motion of the low-temperature air SA blown out from the adjacent air supply ports 15 will promote each other, and will be attracted to the low-temperature air SA blown out from each air supply port 15. The amount of air attracted in the air-conditioned space 10 can be further increased. For this reason, even if the low temperature air SA is blown out from the air supply port 15 at a high speed, the attenuation distance can be significantly shortened.

  As mentioned above, although an example of preferable embodiment of this invention was demonstrated, this invention is not limited to the form of illustration. For example, a part of the exhaust EA may be returned to the air conditioner 22 and reused by providing a return duct 45 indicated by a dotted line in FIG. Further, the exhaust fan 40 may be omitted, and the heated air accumulated in the upper part of the air-conditioned space 10 may be sequentially pushed out by the low-temperature air SA supplied downward in the air-conditioned space 10. Further, the exhaust port 16 may be formed in the ceiling of the air-conditioned space 10. Furthermore, the replacement ventilation system of the present invention can be applied not only to a living room but also to various air-conditioned spaces where humans and various devices as described above exist.

  3 and 4, the example in which the blowing members having a configuration in which the plurality of fins 30 are radially attached to the support member 31 is mounted on each air supply port 15 is described. The structure of the blowing member is not limited to this form. For example, a blowing member having a structure formed by punching fins from a flat plate, such as the swirl flow forming plate previously disclosed by the present applicant in FIG. 5 of JP-A-9-250803, may be used. In any case, any blowing member that can provide a swirling component may be used. Further, in the plurality of air supply ports 15 arranged side by side on the front surface 21 of the air supply chamber 20, as shown in FIG. 7, the air supply ports 15 arranged vertically and the air supply ports 15 arranged laterally are arranged. In any of the above, the swirl components of the low-temperature air SA blown out from the adjacent air supply ports 15 may be set so as to have a relationship in the opposite rotation direction. On the other hand, as shown in FIG. 8, the swirl components of the low-temperature air SA blown out from the adjacent air supply ports 15 are in the relationship of opposite rotation directions between the air supply ports 15 arranged vertically. However, the swirl components of the low-temperature air SA blown out from the adjacent air supply ports 15 may be set so as to have the same rotational direction relationship between the air supply ports 15 arranged horizontally. On the other hand, although not shown, the swirl components of the low-temperature air SA blown out from the adjacent air supply ports 15 between the air supply ports 15 arranged side by side are in a relationship of opposite rotation directions. The swirl components of the low-temperature air SA blown out from the adjacent air supply ports 15 may be set so as to have the same rotational direction relationship between the air supply ports 15 arranged above and below. Further, the swirl components of the low-temperature air SA blown out from all the air supply ports 15 may be set so that all have the same rotational direction relationship. Furthermore, the swirl component of the low-temperature air SA blown from each air supply port 15 may be set so as to be irregularly the same rotation direction or the reverse rotation direction. The rotation direction of the swirl component of the low temperature air SA blown out from each air supply port 15 can be arbitrarily set.

  Examples were carried out on the replacement ventilation system of the present invention. FIG. 9 is a graph showing a comparison between the replacement ventilation system of the present invention and the conventional replacement ventilation system configured to blow out low-temperature air without supplying a swirling component from the supply port. It is the graph which showed the change of the wind speed Vmax (maximum wind speed Vmax in each distance away from the air inlet). FIG. 10 is a graph showing a change in the unsatisfied person ratio PD due to the draft with respect to the distance from the air supply port, comparing the replacement ventilation system of the present invention with the replacement ventilation system of the conventional example. 11 and 12 are graphs showing the temperature difference in the air-conditioned space (temperature change with respect to the height from the floor), FIG. 11 shows a conventional replacement ventilation system (FIG. 11), and FIG. It shows about the substitution ventilation system (FIG. 12) of invention.

In comparing the present invention with the conventional example, the same air volume (20 m ³ / (h / m ² )) and the same indoor heat generation (50 W / m ² ) were used. Here, PD was calculated using the following equation (1).
PD (%) = (34- t a) · (V-0.05) 0.62 · (0.37 · V · T u +3.14) ··· (1)
V: Wind speed (m / s)
t _a : Air temperature (° C)
T _u : Turbulence intensity (%) = V _ST / V · 100
V _ST : Standard deviation of wind speed

In the air-conditioned space, the supply air temperature was adjusted so that the temperature of 1.1 m above the floor, which is the living area, was 25 ° C. The blowing air speed in the replacement ventilation system of the conventional example was 0.17 m / s, and the blowing air speed in the replacement ventilation system of the present invention was about 10 times that of the conventional example. 11 and 12, ΔT _R : temperature increase rate due to radiant heat transfer, ΔT _ENT : temperature increase rate due to blowing induction, T _S : supply air temperature, T _E : exhaust gas temperature, H _ST : stratification height (air conditioning Equilibrium height of air volume and heat plume air volume generated from indoor heat generation), T _ST : Air temperature of stratification height (almost equivalent to exhaust temperature), T: Temperature at arbitrary height, T _F : Temperature at floor surface The temperature difference (horizontal axis) was expressed as a temperature ratio (T−T _S ) / (T _E −T _S ) with respect to the temperature difference between the floor and the ceiling. In the replacement ventilation system of the present invention, although the blowout wind speed is increased by about 10 times, except in the vicinity of the air supply port (within 1 m from the air supply port), the upper and lower parts in the living area are higher than in the conventional replacement ventilation system. The temperature difference is small and a more comfortable environment can be realized.

It is a schematic block diagram for demonstrating the replacement ventilation system concerning embodiment of this invention. It is a front view of an air supply chamber. It is a front view of the air supply port which attached the fin so that the turning component of a counterclockwise rotation direction might be given to low temperature air seeing from the indoor side of an air-conditioning space. It is a front view of the air supply port which attached the fin so that the turning component of a clockwise rotation direction might be given to low temperature air seeing from the room inner side of an air-conditioning space. It is explanatory drawing of the air supply port which made the swirl component of the low temperature air blown off from an adjacent air supply port alternately the reverse rotation direction. It is explanatory drawing of the air supply port which made the rotation component of the low temperature air blown off from an adjacent air supply port the same rotation direction. The swirl components of the low-temperature air blown out from the adjacent air supply ports are in the relationship of opposite rotation directions between the air supply ports arranged vertically and the air supply ports arranged horizontally. It is explanatory drawing of the air supply opening set to. Between the air supply ports arranged vertically, the swirling components of the low-temperature air blown out from the adjacent air supply ports are in the relationship of the rotation directions opposite to each other, but between the air supply ports arranged horizontally, FIG. 4 is an explanatory diagram of an air supply port set such that swirl components of low-temperature air blown out from adjacent air supply ports have the same rotational direction relationship. It is the graph which showed the change of Vmax with respect to the distance from an air inlet about the substitution ventilation system of this invention, and the substitution ventilation system of a prior art example. It is the graph which showed the change of unsatisfied person ratio PD by the draft with respect to the distance from an inlet port about the substitution ventilation system of this invention, and the substitution ventilation system of a prior art example. It is a graph which shows the temperature difference (Temperature change with respect to the height from a floor) in conditioning space about the substitution ventilation system of a prior art example. It is a graph which shows the temperature difference (Temperature change with respect to the height from a floor) in the adjustment space about the substitution ventilation system of this invention. It is a perspective view for demonstrating the subject of a general substitution ventilation system. It is a perspective view for demonstrating the subject at the time of installing adjacently, without isolating a some air supply chamber.

Explanation of symbols

SA Low-temperature air 1 Replacement ventilation system 10 Air-conditioned space 11 Human 15 Air supply port 16 Exhaust port 20 Air supply chamber 22 Air conditioner 23 Air supply duct 30 Fin 40 Exhaust fan 41 Exhaust duct

Claims (4)

An air supply chamber for supplying low-temperature air into an air-conditioned space where replacement ventilation is performed,
A low-temperature air supply port is provided on the front surface, and a fin that provides a swirl component to the low-temperature air is provided at the air-supply port. An air supply chamber for replacement ventilation, characterized by having a directional relationship.
  2. The air supply chamber for replacement ventilation according to claim 1, wherein the air supply chamber for replacement ventilation according to claim 1 is provided in a lower portion of the side surface of the air-conditioned space in a state where the front surface is exposed to the lower side surface of the air-conditioned space.   The air supply chamber for replacement ventilation according to claim 1 or 2, wherein a plurality of air supply ports are arranged vertically and horizontally on the front surface.   A plurality of air supply ports are provided on the front surface, fins inclined to each air supply port are attached, and the inclination directions of the fins of adjacent air supply ports are opposite to each other. An air supply chamber for replacement ventilation according to any one of the above.

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