JP3285117B2 - Air conditioning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning method, and more particularly to an air conditioner suitable for use in a building having a large heat load, such as office automation (OA) equipment, in a room such as an intelligent building compatible with advanced information technology. About the method.

[0002]

2. Description of the Related Art In recent years, rapid advancement of information technology has been promoted in office buildings, which is called an intelligent building, and a number of OA devices have been introduced. With these changes, the air-conditioning load of office buildings is different from before.
The proportion of the cooling load is increasing, and the case where the capacity of the air conditioning equipment needs to be increased due to insufficient cooling capacity is increasing.

In such a case, a conventional method of increasing the capacity of the air conditioning equipment includes a method of simultaneously increasing the capacity of the cold heat source and the size of the piping system, increasing the capacity of the air conditioner, and increasing the size of the duct system, and the like. Have been.

FIG. 6 shows an outline of a conventional air conditioner for cooling. The outline of the conventional air conditioning equipment will be described below for each equipment of the air conditioning equipment. Introduction In recent years, the capacity of a cold heat source has been rapidly increasing in load in a living room in recent years. At the time of planning of the building that is currently being renovated, 15 to 20 years ago, energy consumption in air conditioning is being considered mainly during the heating period, and cooling load is mostly due to lighting load and human body load. On the other hand, in buildings constructed in recent years, it has been considered mainly during the cooling period,
In addition, the cooling load due to the waste heat of OA equipment is increasing.
50 in equipment rating per unit area compared to 5 to 20 years ago
It is generally said that the cooling load of about VA / m ² has increased, and it is necessary to prepare a cooling source with an increased cooling load.

Next, the size of the piping system will be described. For the reasons described above, the size of the piping system also tends to increase. The renovation of the existing building will be examined below in terms of the size of the piping system. In this case, it is necessary to consider the relationship between the service life of the piping system and the construction cost due to the ease of repair. In particular, in general, vertical piping installed in the height direction of the piping system has a slow progress of corrosion probably because cold and hot water is supplied to the inside of the piping without stagnation, and the repair cycle of air conditioning equipment is 15 to 20 years. It has a long service life, and it is desirable to use existing equipment as it is in consideration of the removal of the slab penetration part processing section by fire protection compartment in the floor height direction or construction such as chipping and reprocessing. If the deteriorated portion of another piping system is repaired while the vertical piping remains, there is a problem that the operation cost of water supply is greatly increased. This is because, in order to maintain the indoor environment described later, in the conventional air conditioning method, the temperature of water supplied from a cold heat source such as a refrigerator is generally set to be constant at about 7 ° C. Therefore, in response to an increase in the amount of heat supplied to the heat exchanger of the air conditioner due to an increase in the cooling load, the amount of water supply must be increased, and the flow rate within the standard flow rate where there is no risk of erosion, which is a form of pipe corrosion, is The current situation is to increase the amount of water supply within the range. Secondary problems arising from the necessity of increasing the amount of water supply include an increase in the possibility of erosion and an increase in transfer energy due to an increase in pressure loss. Therefore, it is desired to lower the temperature of water supplied from a cold heat source such as a refrigerator to avoid occurrence of a secondary problem. However, as described above, since the water supply temperature cannot be reduced below the current level, the secondary There was no means to prevent the occurrence of technical problems.

Next, in order to increase the capacity of the air conditioner, it has conventionally been general to supply cold water of about 7 ° C. to the air conditioner and discharge conditioned air of about 15 to 18 ° C. This is 15-2
There is no difference between 0 years ago and recent years. For this reason, capacity expansion is being addressed by increasing the capacity of the blower and increasing the efficiency of the heat exchanger.

[0007] Lastly, regarding the duct system, in the conventional air conditioning system, as described above, the air supply temperature is cooled to about 15 to 18 ° C during cooling as in the past, and the amount of air is blown to increase internal heat generation. Since it was necessary to cope with the problem by increasing the fan volume, the fan duct size was increased due to an increase in the amount of air to be blown, thereby increasing the equipment cost and increasing the fan power.

There are two reasons why the supply air temperature during cooling cannot be made lower than the above-mentioned setting. One is that if the setting is less than the above setting, the supply air to the room and the air in the room will not be sufficiently agitated and mixed. Unevenness occurs, the state of each part of the air flow in the supply air becomes uneven, and a problem arises in that the comfort of the indoor thermal environment is impaired due to the occurrence of cold draft and the like. The other is that if it is below the above-mentioned setting, there is a concern that dew condensation may occur, and due to moistening, the occurrence of mold and its air diffusion will result in air quality that is a concern for the occurrence of diseases commonly referred to as thick buildings. There is a problem. For the above reasons, in the conventional air-conditioning method, the supply air temperature during cooling is set at about 15 to 18 ° C., and an increase in internal heat generation is dealt with by increasing the air flow.

This is because the supply temperature of the chilled water is 7
It is related to being set in ° C. Various ice storage air-conditioning systems, which are recently used as cold heat sources, and low-temperature chillers have the ability to supply low-temperature chilled water of about 4 ° C, but the temperature of the air blown into the room is the same as the conventional air-conditioning level. Since the temperature is about 15 to 18 ° C., actually, cold water at about 7 ° C. has to be supplied, and at present, the feature is not effectively utilized.

Although the conventional method of transporting cold water and cooling air in an air conditioner has been described above, the same applies to the case of planning a new air conditioner and the case of repairing an old one. In air conditioning equipment, it is desirable to convey chilled water and air as low as possible during cooling by pipes and ducts, and to reduce the conveyance power in proportion to the cube of the equipment cost and the conveyance amount, but in reality the condensation, From the viewpoint of avoiding problems such as cold draft and maintaining the indoor environment, it has been impossible to operate the air conditioning system under desired temperature setting conditions.

FIG. 6 shows a general example of the arrangement of the outlet 2 and the inlet 3 in the living room 1 in a conventional air conditioning system. In a conventional air-conditioning system, the outlets 2 are arranged at equal intervals on the system ceiling or the like, and the inlets 3 are similarly piped at equal intervals on the system ceiling or the like. An air intake duct 4 is disposed in the space above the ceiling, and air-conditioning air is supplied to the air intake duct 4 through an air conditioner 7 provided with a heat exchanger 6 through which a heat medium circulating with the cold heat source 5 is passed. ing. The return duct 8 connected to the suction port 3 is an air conditioner 7
, And the indoor air is circulated by the blower 9.

In such a layout, in order to prevent a short circuit of the conditioned air, a large outlet constant indicating the diffusivity of the conditioned air must be taken.
That is, the length of the region where the blown air does not mix with the room air must be long. Further, since the outlet 2 is installed in parallel with the floor surface, the conditioned air tends to be discharged relatively perpendicular to the ceiling surface. As a result, there has been a problem in the conventional arrangement of equipment in a living room that a situation has been created in which dew condensation and cold draft are likely to occur.

[0013]

The present invention is effective in coping with the above-mentioned conventional cooling load and can cope with a high temperature of intake air at the time of heating without increasing equipment costs and power costs. In particular, it is an object of the present invention to provide an air conditioning method capable of coping with a problem of an increase in internal heat generation in a high-informatization building.

[0014]

[0015]

[0016]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In the air conditioning method according to the present invention, a ceiling chamber separated from a room to be air-conditioned is formed, a plurality of air outlets for blowing conditioned air are arranged in the ceiling chamber, and each air outlet is arranged along an inner wall of the chamber. To form a swirling airflow in the chamber in a direction of circling in one direction, and circulate at least a portion of the air discharged from the room to be air-conditioned into the chamber to mix with the air-conditioned air. later, to blow a mixed conditioned air from said chamber to the air conditioned room
It is characterized by having.

In addition, an underfloor chamber separated from the room to be air-conditioned is formed, a plurality of outlets for blowing conditioned air are arranged in the underfloor chamber, and each outlet is circulated in one direction along the inner wall of the chamber. Forming a swirling airflow in the chamber toward the direction in which the air is to be circulated, and circulating at least a portion of the air discharged from the room to be air-conditioned into the chamber and mixing the air with the conditioned air. It was configured to blow mixed conditioned air into the room to be conditioned.

[0018]

[0019]

[0020]

A ceiling chamber or an underfloor chamber is formed in a room to be air-conditioned, and at least a part of the room air is introduced into the chamber while generating a swirling airflow of the conditioned air, and is stirred and mixed by the swirling airflow. By supplying the conditioned air into the room after the above, the mixing property of the conditioned air can be improved. Similarly, even when the supply air temperature is lower than that of the related art, an air conditioning system that does not deteriorate the indoor environment such as the occurrence of cold draft or dew condensation can be provided.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the air conditioning method according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a case where the entire configuration for realizing the air conditioning method according to the first embodiment used in the cooling system is applied to a living room space where the area to be air-conditioned is a square space. As shown in the figure, the air conditioning system according to the embodiment has an air supply duct 14 from an air conditioner 12 installed outside the living room space 10 and transfers the air duct 14 to a ceiling chamber 18 formed on the back surface of a ceiling plate 16. It is branched into two pipes. Each of the branched air supply ducts 14 is disposed along a pair of parallel wall surfaces, and a pair of front and rear branch pipes is further branched from each of the air supply ducts 14, and this is used as an air-conditioning air blowing pipe 20. It penetrates through the ceiling plate 16 and is arranged so as to face four corners of the ceiling surface of the living room space 10. An outlet 22 is formed at a protruding portion of the outlet pipe 20 into the living room space 10, and a blowing direction from the outlet 22 is directed to the outlet pipe 20 arranged at one corner adjacent to the living room space 10. It is set so as to be directed so that the blowing direction from each blowing pipe 20 circulates in one direction along the wall surface of the living room space 10. In the illustrated example, a quadrangle having four blowing pipes 20 as intersections is set, and the sides of the quadrangle are set as blowing direction lines, and the outlets 22 are set so as to extend in one direction around the quadrangle. This is set (see FIG. 1 (2)). This blowing direction is indicated by arrow A. In addition, ceiling board 1
6, the blowing direction is slightly downward so as to form an acute angle. By doing this,
When the conditioned air is discharged from the four outlets 22, the swirling airflow 2 accompanied by the indoor air is generated inside the living room space 10.
4 and gradually descends, and finally an airflow reaching the floor 26 is formed.

An inlet 28 is provided on the floor 26 of the living room space 10.
Which is arranged at the center of the air-conditioning zone so as to be equidistant from the four outlet pipes 20 and communicates with the underfloor chamber 30. Further, an intake pipe 32 opened to the underfloor chamber 30 is provided, and this is connected to the external air conditioner 12 described above. The air conditioner 12 includes a heat exchanger 34 and a blower 36 therein, and after the air sucked through the intake pipe 32 is adjusted to a predetermined temperature by passing through the heat exchanger 34, the air is sent to the air duct 14 by the blower 36. I am trying to blow it. Further, a cold heat source 38 connected to a heat exchanger 34 of the air conditioner 12 by a circulation passage is provided, and a cold medium is circulated and supplied to the heat exchanger 34 by a pump 40.

In this embodiment, outlets 22 are arranged at four corners of a 14 m × 21 m rectangular air-conditioning zone, and the angle at which the direction of discharge of conditioned air from all the outlets 22 to the ceiling is an acute angle. And a diagram in which the discharge directions of all the outlets are projected on the ceiling surface is arranged so as to draw a rectangle. As a result, the conditioned air becomes a swirling downward flow in one direction inside the living room space 10 and the floor surface Reach 26. As a result, the conditioned air generates a large swirling airflow in an inverted conical shape from the ceiling surface of the living room space 10 toward the floor surface 26. In the conventional system, the air-conditioned air after discharge relatively linearly reaches the living area corresponding to a height of about 1.2 m from the floor where the worker is always present, and the mixing with the indoor air is insufficient. According to the air-conditioning method according to the present embodiment, the air-conditioning air is discharged from the outlet 22 and reaches the living area, while being transported to the living area as it is and there is a fear of occurrence of cold draft. Can be set to be long, so that the air-conditioned air and the room air are sufficiently mixed, and the fear of the occurrence of cold draft is greatly reduced.

Further, in the conventional system, the temperature of the conditioned air to the living room as the air-conditioned area is blown out at about 17 ° C. even during cooling, but according to the present embodiment, it is about 10 ° C. Even when the conditioned air is discharged, the indoor environment such as the occurrence of cold draft and dew condensation hardly deteriorates. For this reason, the temperature of cold water supplied from the heat source equipment to the air conditioner is about 7 ° C. in the conventional system, but is practically limited to about 3 to 4 ° C., which is a temperature at which there is little possibility of freezing inside the piping. It is possible to lower the temperature.

In the above embodiment, the room space 10
The blowout pipes 20 arranged at the four corners are arranged along the structural columns, or the blowout pipes are formed directly on the structural columns so that the protrusions can be seen from the ceiling plate 16. The appearance can be prevented from being impaired.

FIG. 2 shows a second embodiment according to a modification of the first embodiment. In contrast to the first embodiment in which the entire room space 10 of 14 m × 21 m is used as an air-conditioned area, the second embodiment uses a floor area of 7 m × 7 m, which is a span of
An air-conditioning area divided into three modules is set, and a swirling airflow 24 is generated in each of the divided areas, whereby the entire air-conditioning zone of 14 m × 21 m is air-conditioned by the plurality of swirling airflows.

That is, in the second embodiment, one module 42 is formed according to the structural span of a building,
The configuration in one module 42 is the same as that of the first embodiment shown in FIG. The difference from the first embodiment is
This is the interaction of the swirling airflow 24 between the modules 42. In the second embodiment, the rotation direction of the swirling airflow 24 between the adjacent modules 42 is configured to be opposite, and as shown in FIG. In the boundary area between the modules 42, the flow of the air flow is in the same direction to reduce the interference of the air flow. Therefore, as shown in FIG. 2A, the swirling airflow 24
Are generated, and air-conditioning of the entire living room space 10 is favorably performed. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Next, FIGS. 3 and 4 show a third embodiment and a fourth embodiment in which the present invention is applied to a ceiling chamber air supply system.

First, the air-conditioning system according to the third embodiment shown in FIG. 3 comprises a cold heat source 38, an air conditioner 12, an air duct 14, a ceiling chamber 18, an outlet 22, and an inlet 28. The air supply duct 14 connects the air conditioner 12 and the ceiling chamber 18, and the outlet 22 is opened in the ceiling chamber 18, which is divided into three or more pieces and arranged at a considerable distance. Have been. In the example of FIG. 3, four outlets 22 for discharging conditioned air having a substantially uniform air volume are arranged near four corners of the ceiling chamber 18 which is rectangular in plan view. A damper (not shown) for equalizing the amount of discharge air is provided at the neck of the outlet 22 so as to equalize the amount of air.

In the third embodiment, the conditioned air from the air conditioner 12 is discharged from the four outlets 22 into the ceiling chamber 18 at an equal flow rate, and the blowout directions are substantially perpendicular to each other. Is set to When the number of the outlets 22 is four or more, as shown in FIG. 4 as a fourth embodiment, as an example of six outlets,
8 so that a large swirling vortex is generated in the outlet 22.
It is necessary to set the direction of the airflow of the conditioned air from above, and arrange the lines so as to form a substantially equilateral polygon equal to the number of outlets so that a straight line forming the discharge direction forms a substantially plane hexagon.

In these embodiments, in order to return the room air to the air conditioner 12 in particular, a part of the air is circulated from the ceiling plate 16 and the suction means provided on the side wall of the living room and supplied to the ceiling chamber 18. The intake means is the intake pipe 3 shown in FIG.
2 (see FIG. 1), a part of the room air may be recirculated. This is a reflux pipe 4 branched from the supply pipe 32.
4 can be extended to the ceiling chamber 18 so that part of the room air is blown into the ceiling chamber 18. The direction in which the return air is blown from the suction means such as the return pipe 44 may be made to coincide with the direction of the swirling flow 24. It is also possible to replace the outlet from the return pipe 44 with a part of the outlet 22 for the conditioned air.

With the arrangement of the outlets 22 shown in the third and fourth embodiments, the low-temperature conditioned air generates a large swirling flow in the ceiling chamber 18 and mixes with the air in the ceiling chamber 18 to raise the air temperature. After that, the liquid is discharged into the living room space 10 from a discharge port 46 provided in the ceiling plate 16 in the living room. The return air from the living room space 10 is returned to the air conditioner, but a part of the air is discharged into the ceiling chamber 18 without passing through the air conditioner 12 via the return pipe 44 or the suction means provided on the ceiling plate or the side wall. And directly mixed with the low temperature conditioned air.

Even if the supply air from the air conditioner is set to a low temperature of about 10 ° C. due to the above-described equipment configuration and the method of transporting air and cold water, the indoor environment such as the occurrence of cold draft and dew condensation which has been a problem in the conventional system is deteriorated. The fear of being made can be greatly reduced.

FIG. 5 shows a fifth embodiment in which the present invention is applied to an underfloor air conditioning method in the same manner as the ceiling chamber supply method. This is suitable for constructing a heating system. The system configuration in the case of FIG. 5 includes a heat source device, an air conditioner, a duct, an underfloor chamber, a ceiling chamber, an outlet, and an inlet. Among them, the air supply duct 14 is provided with three outlet pipes 20 connected to the air conditioner and the underfloor chamber 30 as in the example of FIG.
It is divided into two or more pieces and arranged at a considerable distance.
In the example of FIG. 5, the underfloor chamber 30 which is rectangular in plan
To discharge conditioned air with a substantially uniform air flow near the four corners of
The outlet pipes 20 are arranged. The outlets 22 are formed in the respective outlet pipes 20, and the outlet directions from the outlets 22 at the four corners are set so as to form the swirling airflow 24 inside the underfloor chamber 30. Is similar. At the neck of the outlet 22, a relief damper for equalizing the discharge air volume is installed.
The air volume was configured to be uniform. In this case, the conditioned air from the air conditioner is different from the example of FIG.
2 and the air was discharged into the underfloor chamber 30 at an equal air volume, and the discharge direction was set and arranged so that the discharge directions were parallel and opposed to each other. In addition, in addition to the outlet 22 for the conditioned air, two outlets 22R are provided in the underfloor chamber 30,
A part of the return air from the living room 10 is divided into two parts equivalent to the conditioned air from the outlet 22R instead of the low-temperature conditioned air from the air conditioner 12, and the air-conditioned air is blown out from the outlet 22 roughly. They are arranged at right angles.

With the above arrangement, the conditioned air is sufficiently mixed in the underfloor chamber 30 and rises to about 17 ° C., and then flows from the discharge port 48 provided on the floor 26 to the living room space 10.
It is discharged into.

[0037]

As described above, according to the present invention,
The conditioned air is swirled through the ceiling or underfloor chamber.
As necessary, at least a portion of the room air is swirled and mixed with the swirling flow, so that the length of the air flow line to the suction port can be increased to improve the mixing with the room air. it can. This is effective not only for cooling loads, but also for high temperatures of intake air during heating, without increasing equipment costs and power costs, etc. An excellent effect of being able to respond is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of an overall configuration of an air conditioning system for realizing an air conditioning method according to a first embodiment and a schematic plan view of an air flow.

FIG. 2 is a side sectional view and a schematic plan view of a second embodiment.

FIG. 3 is a system configuration diagram and a schematic plan view applied to a ceiling chamber air-conditioning method according to a third embodiment.

FIG. 4 is a system configuration diagram and a schematic plan view of a fourth embodiment.

FIG. 5 is a system configuration diagram and a schematic plan view applied to an underfloor air conditioning method according to a fifth embodiment.

FIG. 6 is an overall configuration diagram of an air conditioning system of a conventional air conditioning method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 living room space 12 air conditioner 14 air duct 16 ceiling plate 18 ceiling chamber 20 outlet pipe 22 outlet 24 swirling airflow 26 floor surface 28 inlet 30 underfloor chamber 32 intake pipe 34 heat exchanger 36 blower 38 cold heat source 40 pump 42 split Module 44 Reflux pipe 46 Ceiling outlet 48 Floor outlet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-263528 (JP, A) JP-A-1-114644 (JP, A) JP-A-4-257650 (JP, A) JP-A-6-Japanese 158780 (JP, A) JP-A-6-174261 (JP, A) JP-A-6-185757 (JP, A) JP-A-6-59726 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 3/00 E04B 5/48 F24F 13/02 F24F 3/06

Claims (2)

(57) [Claims] 1. A ceiling chamber separated from a room to be air-conditioned is formed, a plurality of outlets for blowing conditioned air are arranged in the ceiling chamber, and each outlet circulates in one direction along an inner wall of the chamber. Forming a swirling airflow in the chamber toward the direction in which the air is to be circulated, and circulating at least a portion of the air discharged from the room to be air-conditioned into the chamber and mixing the air with the conditioned air. An air-conditioning method characterized in that mixed air-conditioning air is blown into a room to be air-conditioned. 2. An underfloor chamber separated from a room to be air-conditioned is provided, and a plurality of outlets for blowing conditioned air are arranged in the underfloor chamber, and each outlet is circulated in one direction along an inner wall of the chamber. Forming a swirling airflow in the chamber toward the direction in which the air is to be circulated, and circulating at least a portion of the air discharged from the room to be air-conditioned into the chamber and mixing the air with the conditioned air. An air-conditioning method characterized in that mixed air-conditioning air is blown into a room to be air-conditioned.