JP2016061546A - Air-conditioning system with floor-mounted outlets - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a simple structure using an underfloor pit to achieve efficient arrangement of an air-conditioning facility and improvement of air-conditioning efficiency.SOLUTION: An air-conditioning system with floor-mounted outlets 1 is installed in a factory 10 having a large underfloor space with an underground pit 3 installed underground. The air-conditioning system comprises: an external air supply section 6 which supplies external air to the underground pit 3; an air-conditioning facility 7 which maintains an inside of the underground pit 3 at a predetermined temperature; and a plurality of floor-mounted outlets 8 which are installed on a PC slab 2A and communicate the inside of the underground pit 3 with a factory interior space R above a floor. The plurality of floor-mounted outlets 8 are arranged throughout the floor 2. At least a portion of the plurality of floor-mounted outlets are provided with fans to upwardly blow air-conditioning air inside the underground pit 3 to the factory interior space R.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a floor blowing air conditioning system provided in a building having a large space in which pits are arranged under the floor.

Conventionally, in an air conditioner in a production facility such as a large factory having a large space, for example, an air conditioner is installed on a floor or a frame of an upper equipment, and an air conditioning duct and an outlet are appropriately installed, and 2 m from the floor surface. It is common to use a stratified air conditioning system that air-conditions residential areas up to a certain height.
In addition, as a factory having a large space as described above, for example, a plurality of pillar materials are erected on the pit bottom of the underground part as described in Patent Document 1, and the girders, PC floor slabs, etc. are formed by these pillar materials. An underground pit structure that is supported from below is known. In this case, by arranging a part of the production line in the underground pit, it is possible to greatly reduce the facilities arranged on the floor. Thereby, the floor can be used effectively, and the production efficiency is improved.

JP 2004-316100 A

However, the conventional stratified air conditioning system for large-scale factories has the following problems.
In other words, air conditioning by stratified air conditioning generally uses the property that cold air lower than the ambient temperature accumulates on the floor surface and functions relatively effectively during cooling, but warm air is heated at the ceiling side of the factory building during heating. It was difficult for effective heating in the residential area, and inefficient air conditioning.

  In the air conditioning by the stratified air conditioning system, air conditioners, ducts, outlets, and the like are installed on the floor surface or on the equipment on the floor, but it is necessary to adjust the arrangement with the production line and the overhead crane. For example, if the air conditioning duct is bypassed to a position that avoids the overhead crane and installed at a long distance, or the air conditioner must be installed at a position away from the necessary living area, it may not be an efficient equipment layout. There was room for improvement in that respect. Moreover, in a large-scale factory where an underground pit is provided, it is required to use the underground pit effectively for the arrangement of the air conditioning equipment as well as the production line.

  The present invention has been made in view of the above-described problems. By adopting a simple structure using a pit under the floor, air conditioning equipment can be effectively arranged and air conditioning efficiency can be improved. An object of the present invention is to provide a floor blowing air conditioning system that can be used.

  In order to achieve the above object, a floor blowing air-conditioning system according to the present invention is a floor blowing air-conditioning system provided in a building having a large space in which pits are arranged under the floor, and supplies outside air into the pits. A pit air conditioning unit that sets the inside of the pit to a predetermined temperature, and a plurality of floor outlets that are provided on the floor and communicate with the space inside the pit and the space on the floor. It is arranged over the entire surface of the floor, and at least a part of the floor is provided with blowing means for blowing the air in the pits into the space on the floor.

  In the present invention, outside air is sent into the pit by the outside air supply unit, and the air in the pit is adjusted to a predetermined temperature by the in-pit air conditioning unit. Then, the air whose temperature is adjusted in the pit is blown out into the space of the building on the floor from the floor outlet. At this time, in a part of the floor outlets provided with the blowing means, air in the pit is higher than the normal floor outlets not provided with the blowing means and with a higher blowing force. Can be blown up into the space above the floor. Therefore, at the time of cooling in which the cool air hardly rises above the space, the cool air in the pit is blown high by the blowing means, so that the cooling area on the floor can be increased. Therefore, efficient stratified air conditioning limited to a residential area (for example, a height of 2 m from the floor) can be performed. For example, even in a building such as a factory having a high ceiling and a large space, effective air conditioning can be performed. It can be carried out.

  In addition, the height of the cold air region can be arbitrarily changed by adjusting the air blowing height and power in the pit by the blowing means according to conditions such as the size of the building space and the outside air temperature. Therefore, efficient air conditioning can be performed according to conditions.

Furthermore, in the present invention, the floor air-conditioning air conditioner is provided with a plurality of floor air outlets on the floor above the pit, and the entire pit functions as an air chamber adjusted by the air-conditioning section in the pit. It is possible to reduce the air conditioning structure. Therefore, there is an advantage that air conveyance power can be suppressed, power saving can be achieved, and air conditioning equipment can be effectively arranged.
In addition, since an in-pit air conditioning unit such as an air conditioner can be installed in the pit, for example, when the building is a factory, the degree of freedom in the layout of the production apparatus on the floor can be increased.

  In the floor blowing air conditioning system according to the present invention, it is preferable that the floor is provided with a floor suction port leading to the pit.

  In this case, air can be circulated to return the air blown up from the floor outlet to the pit from the floor inlet, and the temperature of the living area on the floor can be stabilized.

  Further, in the floor blowing air conditioning system according to the present invention, the floor is configured by combining a plurality of precast concrete floor slabs detachably provided on a girder erected in the pit, It is preferable that the precast concrete slab is formed by cutting out an edge portion.

In this case, since the plurality of precast concrete slabs constituting the floor are detachable, the layout of the air conditioning equipment in the pit can be easily changed by appropriately removing these precast concrete slabs. And since the part (notch recessed part) which notched the edge part of the precast concrete floor slab can be used as a floor blowing outlet, there exists an advantage that construction which provides a floor blowing outlet after installing a floor becomes unnecessary. .
In addition, since the precast concrete floor slab itself has a heat storage effect, it is possible to provide a floor heat storage air conditioner that suppresses temperature changes in the pits to be small. Therefore, for example, there is an advantage that the operation can be performed while the air conditioning is stopped in the peak time zone of the electric power in summer.

  In the floor blowing air conditioning system according to the present invention, the pit is preferably an underground pit provided underground.

  In this case, the enclosure that forms the underground pit has a stable temperature throughout the year due to geothermal heat (for example, about 14 to 18 ° C.), so it functions as a cold wall in summer and as a hot wall in winter. Therefore, the air conditioning efficiency can be improved, and the power consumption of the air conditioning can be achieved.

  According to the floor blowing air conditioning system of the present invention, in a building having a large space where pits are arranged under the floor, it is possible to effectively arrange the air conditioning equipment by adopting a simple structure using the pits under the floor. In addition, the air conditioning efficiency can be improved.

It is a perspective view which shows schematic structure of the floor blowing air conditioning system by embodiment of this invention. It is the perspective view which expanded a part of floor blowing air conditioning system shown in FIG. It is a top view which shows a part of PC floor slab. It is the side view which showed the structure of the floor blowing air conditioning system typically. It is a figure which shows the structure of the floor outlet provided in PC floor slab, Comprising: (a) is the top view seen from upper direction, (b) is a longitudinal cross-sectional view. It is a figure of the thermal environment state using a floor blowing air conditioning system, Comprising: It is a figure which shows the state at the time of cooling. It is a top view which shows the analysis model by an Example. It is a figure which shows the result of the simulation by Example 1. FIG. It is a figure which shows the result of the simulation by the comparative example 1. It is a figure which shows the result of the simulation by Example 2. FIG.

  Hereinafter, the floor blowing air-conditioning system by embodiment of this invention is demonstrated based on drawing.

As shown in FIG. 1, a floor blowing air conditioning system 1 according to the present embodiment is provided in a factory 10 (building) having a large space in which underground pits 3 (pits) are arranged under the floor. The factory 10 has, for example, a production line for a large machine, has a factory space R of a predetermined size necessary for manufacturing the product, and is provided with a floor 2 and the underground pit 3. ing.
The ceiling portion of the factory 10 is provided with an exhaust port (not shown) so that the air in the factory space R is naturally exhausted.

  Here, in the present embodiment, the factory space R has a substantially rectangular shape in plan view, the width direction (short side direction) is referred to as the horizontal direction X, the longitudinal direction is referred to as the vertical direction Y, the width direction X and The vertical direction Y is orthogonal to each other in the horizontal plane.

The underground pit 3 is located in the ground, and is constructed, for example, on the almost entire surface of the floor 2 in the factory 10 at a depth of about 3 m, and is composed of a side wall 3b and a pit bottom board 3a. Therefore, the air in the underground pit 3 is cooled or heated by the underground heat transmitted from the surrounding ground to the frame (side wall 3b and pit bottom 3a).
As shown in FIGS. 2 and 3, the underground pits 3 are erected on the pit bottom board 3a, and are pillar members 31 arranged at certain intervals in each of the horizontal direction X and the vertical direction Y. And a girder 32 made of steel beams that are joined to and erected on the upper end surface 31a of the column member 31 and arranged in the longitudinal direction along the longitudinal direction Y. A precast concrete floor slab (hereinafter referred to as a PC floor slab 2A) is installed on the adjacent girders 32, 32 that are adjacent to each other in the arrangement direction, with two opposing sides being placed.

The column member 31 is made of reinforced concrete (RC), is formed in a square shape in a cross-sectional view, and is integrally placed on the pit bottom 3a, and has the same arrangement interval in both the horizontal direction X and the vertical direction Y (see FIG. L1 and L2) shown in FIG. The upper end surfaces 31a of the plurality of column members 31, 31,... All have the same height (level).
The dimensions and arrangement intervals L1 and L2 of the column members 31 are the shape and weight of the PC floor slab 2A, the weight of equipment / equipment running or installed on the PC floor slab 2A, and the height of the underground pit 3 It is set as appropriate according to the conditions. In the present embodiment, for example, a cross section having a side of 70 cm is employed. For example, anchor bolts (not shown) protruding from the upper end surface 31a are embedded in the column member 31, and the beam members 32 are detachably attached by bolt fastening using these anchor bolts.

The girder 32 is an H-shaped steel having a width of 30 cm smaller than the side dimension of the column material 31 and a height of 40 cm, and the length dimension is, for example, the length of three spans in the column material 31. . That is, when the arrangement intervals L1 and L2 of the column members 31 are 4 m, the beam members 32 having a length dimension of 12 m are used. In addition, there is no restriction | limiting in the height dimension of the column material 31, and the length dimension of the beam 32, It can set arbitrarily. The beam member 32 can be fixed by inserting the anchor bolt protruding from the upper end surface 31a of the column member 31 through a bolt hole (not shown) formed in the lower flange of the beam member 32 and tightening with a nut.
In the girder 32 configured as described above, the longitudinal direction can be changed from, for example, the vertical direction Y to the horizontal direction X by removing the nut from the pillar material 31.

  As shown in FIG. 3, a cross-shaped positioning piece 33 is projected on the upper surface of the beam member 32 in a plan view at a portion located on the column member 31 of the beam member 32. The positioning piece 33 is arranged so that the surface direction of each piece is along the vertical direction Y or the horizontal direction X. The PC floor slab 2 </ b> A is positioned at a predetermined position by matching the corner of the PC floor slab with the recess formed by the cross of the positioning piece 33.

The PC floor slab 2A has a square shape in plan view, and is supported in a state in which one opposing two sides are respectively placed on the upper surface of the girders 32, and a plurality of them are arranged without gaps in the horizontal direction X and the vertical direction Y. Has been.
The PC floor slab 2A is formed with a notch recess 21 that is notched in a U-shape at the center in the length direction of one opposing edge. Then, by making the notch recesses 21 of the adjacent PC floor slabs 2A face each other and match each other, a substantially square opening is formed in a plan view communicating the underground pit 3 and the factory room space R (see FIG. 2). This is formed and becomes a floor outlet 8 to be described later.
Note that the PC floor slab 2A may be manufactured locally, for example, at the time of construction of the underground pit 3, or may be manufactured at a production factory other than the local site and carried into the local site.

  As shown in FIG. 4, the floor blowing air conditioning system 1 includes an outside air supply unit 6 that sends outside air into the underground pit 3, an air conditioning facility 7 (in-pit air conditioning unit) that sets the underground pit 3 to a predetermined temperature, 2 is provided with a plurality of floor outlets 8 (see FIGS. 2 and 3) that communicate the inside of the underground pit 3 and the factory room space R on the floor 2.

  The outside air supply unit 6 includes an outside air supply duct 61 that communicates the outside of the factory 10 (outdoors) and the inside of the underground pit 3, and an air conditioner in which an end of the outside air supply duct 61 on the underground pit 3 side is provided in the underground pit 3. It is connected to the air conditioner 70 of the facility 7.

The air conditioner 7 takes the above-described air conditioner 70 (direct air conditioner 70A, indirect air conditioner 70B) disposed in the underground pit 3 and ground water (hereinafter referred to as well water W) and sends it to the air conditioner 70 side. Intake well 71, a reduction well 72 returned to the ground water from the air conditioner 70 side, a heat exchanger interposed between each of the intake well 71 and the reduction well 72 and the air conditioner 70 (indirect air conditioner 70B) 73.
As described above, the air-conditioning equipment 7 according to the present embodiment is configured to use groundwater whose temperature is constant throughout the year.

The air conditioner 70 (70A, 70B) has a function of circulating or cooling the well water W cooled or heated by the heat exchanger 73 and cooling or heating the passing air. The air conditioner 70 has a direct air conditioner 70A connected to the end of the outside air supply duct 61 and an indirect air conditioner 70B connected via the heat exchanger 73 as described above.
The direct air conditioner 70A is connected to the intake well 71 and the reduction well 72, and directly cools and heats the outside air supplied into the underground pit 3. A plurality of indirect air conditioners 70B are arranged over the entire underground pit 3, and are adjusted to an appropriate temperature by allowing the air in the underground pit 3 to pass therethrough. In the present embodiment, the indirect air conditioner 70B is also connected to the direct air conditioner 70A connected to the end of the outside air supply duct 61.

  A plurality of floor outlets 8 are arranged over the entire surface of the floor 2 and are formed in a rectangular shape by making the notch recesses 21 (see FIG. 3) provided in the adjacent PC floor slabs 2A face each other, as shown in FIG. As shown in (b), a blow-up fan 81 (blow-up means) blows conditioned air in the underground pit 3 into the factory room space R on the floor 2 at least in a part of the plurality of floor blow-out openings 8. ) Is provided.

  Here, as shown in FIGS. 4 and 6, the floor outlet 8 provided with the blowing fan 81 is referred to as a first floor outlet 8A, and the floor outlet 8 from which the blowing fan 81 is omitted is referred to as the second floor. It is called the outlet 8B. At the first floor outlet 8A, the conditioned air in the underground pit 3 can be blown up to a position higher than the second floor outlet 8B by rotating the blowing fan 81. FIG. 6 shows the temperature state during cooling in the factory 10, and the lighter the color, the lower the temperature. In this case, when the inside of the underground pit 3 is set to 23 ° C., the temperature near the ceiling of the factory 10 is as high as 30 ° C. or higher.

Further, the floor outlet 8 is provided with a grating 82 along the opening. The grating 82 is formed in a lattice shape and is disposed so as to block the entire opening.
The blower fan 81 is a simple one that is fixed to the lower surface of the grating 82 and fits in the floor outlet 8.

Next, the effect | action of the floor blowing air conditioning system mentioned above is demonstrated based on drawing.
As shown in FIG. 4, in the present embodiment, outside air is sent into the underground pit 3 by the outside air supply duct 61, and the air in the underground pit 3 is adjusted to conditioned air at a predetermined temperature by the air conditioning equipment 7. Specifically, the outside air sucked from the outside air supply duct 61 is introduced into the underground pit 3 through the direct air conditioner 70A and the indirect air conditioner 70B connected to the end of the outside air supply duct 61. Further, the air passes through a plurality of indirect air conditioners 70 </ b> B provided in the underground pit 3, becomes conditioned air, and is stored in the underground pit 3. The conditioned air whose temperature is adjusted in the underground pit 3 is blown out from the floor outlet 8 into the factory indoor space R on the floor.

  At this time, in a part of the first floor outlets 8A provided with the blowing fan 81 shown in FIG. 5, it is higher than the normal second floor outlet 8B where the blowing fan 81 is not provided. In addition, the conditioned air in the underground pit 3 can be blown up into the factory room space R with a large blowing force (see FIG. 6). Therefore, at the time of cooling in which it is difficult for the cool air to rise above the factory indoor space R, the cool air in the underground pit 3 is blown high by the blower fan 81, so that the height of the cooling region on the floor can be increased. Therefore, efficient stratified air conditioning limited to a residential area (for example, a height of 2 m from the floor) can be performed, and even in the factory 10 having a high ceiling and a large space as in the present embodiment, Effective air conditioning can be performed.

  In addition, according to conditions such as the size of the space of the building such as the factory 10 as in the present embodiment and the outside air temperature, the blowing height and blowing force of the conditioned air in the underground pit 3 by the blowing fan 81 are set. By adjusting, the height of the cold air region can be arbitrarily changed, and efficient air conditioning can be performed according to the conditions.

  Further, in the present embodiment, the floor blowout air conditioning is provided with a plurality of floor blowout openings 8 in the floor 2 on the underground pit 3, and the entire underground pit 3 functions as a chamber of conditioned air adjusted by the air conditioning equipment 7. As a result, the air conditioning duct can be reduced and a simple air conditioning structure is obtained. Therefore, there is an advantage that the air-conditioning equipment 7 can be effectively arranged while the power for conveying the air-conditioned air can be suppressed to save power.

  And since the air conditioner 70 can be installed in the underground pit 3, in the case of a factory like this Embodiment, the freedom degree of the layout of the production apparatus on a floor can be raised. For example, it is possible to secure a work space, to expand the operation area of the overhead crane, and to flexibly cope with future production line changes, equipment layouts and flow lines.

Moreover, in this Embodiment, since several PC floor slab 2A which comprises the floor 2 is detachable with respect to the girder 32, these PC floor slabs 2A are removed suitably, and air conditioning equipment in the underground pit 3 is removed. The layout can be easily changed. And since the part (notch recessed part 21) which notched the edge part of PC floor slab 2A can be used as the floor blowing outlet 8, the installation which provides a floor blowing outlet after installing the floor 2 becomes unnecessary. There are advantages.
Further, since the PC floor slab 2A itself has a heat storage effect, it is possible to provide a floor heat storage air conditioner in which the temperature change in the underground pit 3 is kept small. Therefore, for example, there is an advantage that the operation can be performed while the air conditioning is stopped in the peak time zone of the electric power in summer.

  Moreover, in the floor blowing air-conditioning system 1 of this embodiment, the pit is an underground pit 3 provided underground, and the frame (pit bottom 3a and side wall 3b) constituting the underground pit 3 is stable throughout the year by underground heat. Since it functions as a low temperature wall in the summer and as a high temperature wall in the winter, the air conditioning efficiency can be improved and the power consumption of the air conditioning can be improved. be able to.

  Further, by adopting a highly airtight and highly heat insulating material as the exterior material of the factory 10, the heat load on the factory 10 may be reduced and further energy saving may be achieved.

  As described above, in the floor blowing air conditioning system according to the present embodiment, in the factory 10 having a large space in which the underground pit 3 is arranged under the floor, the air conditioning system has a simple structure using the underground pit 3 under the floor. Equipment can be effectively arranged and air conditioning efficiency can be improved.

  Next, examples carried out to support the effects of the floor blowing air conditioning system according to the above-described embodiment will be described below.

(Example)
In this example, an analysis model of a floor blowing air conditioning system as shown in FIG. 7 was created, a thermal environment simulation was performed, and the thermal environment on the floor was confirmed. Example 1 is a case during cooling using the above-described blowing fan, Comparative Example 1 is a case during cooling without using the blowing fan, and Example 2 is a case during heating without using the blowing fan. .

  The analysis model shown in FIG. 7 shows that in the case of Example 1, the first floor outlet 8A provided with the blowing fan and the second floor outlet 8B not provided with the blowing fan are arranged in the Z-axis direction (up and down on the paper surface). (Direction) are alternately arranged on the floor 2. An air conditioner 70 is arranged at an appropriate position in the pit 3A under the floor. In the simulation of Example 1, when the temperature in the pit 3A was set to 23 to 25 ° C., the air was blown out with a predetermined blowing force and blowing height from each of the floor outlets 8A and 8B. The thermal environment was confirmed. FIG. 8 is a simulation result according to Example 1, and shows a longitudinal section (reference numeral D in FIG. 7) along the Z-axis direction.

  As shown in FIG. 8, in Example 1, even in the area between the first floor outlets 8A provided with the blower fans, the height of the floor 1.5 m is approximately 27.5 ° C. Even at a height of 2 m, the temperature is about 28 ° C. Furthermore, even at a height of 5 m above the floor, it is approximately 28.5 ° C., and it can be confirmed that the temperature rises in a stepwise manner. That is, the maximum temperature 31 is exceeded near the ceiling in the building space. In addition, the blowing height of the conditioned air by the first floor outlet 8A at this time is 3 to 4 m above the floor.

Next, Comparative Example 1 shown in FIG. 9 will be described. Comparative Example 1 is a case in which the same analysis model as in Example 1 described above is used, and the blower fan is not used during cooling. That is, all the floor outlets are cases in which the second floor outlet 8B adopts an air-conditioning method by natural blowing.
As shown in FIG. 9, the analysis result in this case reaches 30 ° C. at a height of 2 m above the floor serving as a living area, and further exceeds the maximum temperature 31 at a height of 3 m above the floor. . As described above, in the air-conditioning only using natural blowing without using the blow-up fan, the temperature is high (30 °) up to the vicinity of the living area, and it can be confirmed that the air-conditioning efficiency of the entire building is lower than that in Example 1.
Thus, at the time of cooling, it turns out that an effective air conditioning can be performed by using a blowing fan like Example 1. FIG.

Next, Example 2 shown in FIG. 10 will be described. The second embodiment is a case where the same analysis model as that of the first embodiment is used, and the blower fan is not used during heating. In the simulation of Example 2, all the floor outlets are natural at the second floor outlet 8 (8B) during heating in which the temperature in the pit 3A is set to 20 to 22 ° C. and the outlet temperature of the air conditioner is set to 22 ° C. The thermal environment when using the blowing method was confirmed. In addition, 18 degreeC under the pit 3A shown in FIG. 10 has shown the temperature of the housing | casing surface.
As shown in FIG. 10, the analysis result in this case is that the temperature in the pit 3A is higher than the outside air, so the conditioned air naturally blown up from the floor outlet 8 (8B) rises toward the ceiling of the building. It can be seen that the building space is generally uniform at a temperature of 20 to 22 ° C. including the living area.

  As mentioned above, although embodiment of the floor blowing air conditioning system by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.

  For example, in the present embodiment, the factory 10 in a large space having the underground pit 3 is an application target of the floor blowing air conditioning system 1, but the present invention is not limited to this. For example, a music hall, a theater, a gymnasium, a sports facility It is also possible to target buildings other than production factories. Further, the pits are not limited to being underground pits 3 and may be pits provided on the ground floor or pits provided in a part of the multilayer structure.

  Moreover, in this Embodiment, as the air-conditioning equipment 7, although the intake well 71, the reduction | restoration well 72, and the heat exchanger 73 are provided and it is set as the structure using groundwater (well water), it is not limited to this, General cooling equipment and heating equipment may be used.

  Furthermore, the floor 2 may be provided with a floor suction port leading to the inside of the pit. In this case, air can be circulated to return the conditioned air blown up from the floor outlet 8 into the pit from the floor inlet, and the temperature of the living area on the floor can be stabilized.

  In the present embodiment, a plurality of PC floor slabs 2A are detachably arranged as the floor 2 with respect to the girders 32. However, the present invention is not limited to such PC floor slabs 2A. . Further, although the cutout recess 21 is provided in the PC floor slab 2A, the configuration of the cutout portion such as shape, size, position and quantity can be set as appropriate. For example, instead of the shape of notching the edge of the PC floor slab 2A, a through hole penetrating through the center portion in plan view may be used as the floor outlet. The point is that when the PC floor slab 2A is installed, it is only necessary to form a floor outlet for communication between the inside of the pit and the space on the floor. Therefore, as in the present embodiment, the notch recesses 21 and 21 of adjacent PC floor slabs 2A are not aligned with each other, and only the notch recess 21 of one PC floor slab 2A may be used as a floor outlet. .

  Furthermore, as the blowing means provided at the first floor outlet 8A, in the present embodiment, the blowing fan 81 is provided inside the opening of the floor outlet, but other forms may be adopted. .

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

1 Floor blowing air conditioning system 2 Floor 2A PC floor slab (precast concrete floor slab)
3 Underground pit
6 Outside air supply section 7 Air conditioning equipment (air conditioning section in the pit)
8 Floor outlet 8A 1st floor outlet 8B 2nd floor outlet 10 Factory (building)
21 Notch Concave 31 Column Material 32 Girder Material 61 Outside Air Supply Duct 70 Air Conditioner 70A Direct Air Conditioner 70B Indirect Air Conditioner 81 Blowing Fan (Blowing Up Means)
82 Grating R Factory room space X Width direction Y Length direction

Claims (4)

A floor blowing air conditioning system provided in a building having a large space with pits arranged under the floor,
An outside air supply unit for sending outside air into the pit;
An air conditioning unit in the pit that sets the inside of the pit to a predetermined temperature,
A plurality of floor outlets provided on the floor and communicating between the space in the pit and the floor;
With
A plurality of the floor outlets are arranged over the entire surface of the floor, and at least a part of the floor outlet is provided with blowing means for blowing conditioned air in a pit into the space on the floor. Air conditioning system.   The floor blowing air conditioning system according to claim 1, wherein the floor is provided with a floor suction port leading to the pit. The floor is configured by combining a plurality of precast concrete floor slabs provided detachably on a girder erected in the pit,
The floor outlet air conditioning system according to claim 1 or 2, wherein the floor outlet is formed by cutting out an edge of the precast concrete floor slab.   The floor blowing air conditioning system according to any one of claims 1 to 3, wherein the pit is an underground pit provided underground.