JPH07217940A - Under-floor air conditioning system - Google Patents

Abstract

PURPOSE:To provide an under-floor air conditioning system in which a blowing tempera ture and a blowing air volume of conditioned air blown from each of blowing ports are made uniform without producing any circulating flow within an under-floor cham ber and disturbance in temperature may not be produced within a room to be air conditioner. CONSTITUTION:The other side wall of an under-floor chamber 24 opposing against a conditioned air discharging port 42 formed at one side wall of an under-floor chamber 24 arranged below a floor 22 of a room 20 to be air conditioned is divided into a vertical direction by a plurality of suction relief dampers 46 arranged in parallel with the air discharging port 42 so as to form an air suction uniform pressure chamber 48 between the side wall and the air suction relief damper 46, conditioned air sucked into an air suction uniform pressure chamber 48 through the air suction relief damper 46 is discharged into a perimeter zone at a window side 52 of the room 20 to be air conditioned through a discharging passage 50. Then, a degree of opening of each of the air suction relief dampers 46 is individually adjusted to produce a flow of conditioned air having a sufficient pressure to be blown from a blowing-out port 30 into the under-floor chamber 24 and having a uniform distribution of air speed and directed in one direction from the air discharging port 42 to an air suction uniform pressure chamber 48.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underfloor air conditioning system, and more particularly to an air conditioning system in which air is blown into an air conditioning room from a plurality of air outlets formed on the floor after being sucked into an underfloor chamber under the floor of the air conditioning room. The present invention relates to an underfloor air conditioning system that can equalize the air outlet temperature and the air outlet amount.

[0002]

2. Description of the Related Art In recent years, in office buildings and the like, members such as free access floors are used to form an underfloor chamber with a double floor structure under the floor, and warm air or cold air is ventilated through the underfloor chamber to obtain a floor surface. An underfloor air conditioning system has been implemented in which air is blown from a plurality of air outlets formed in the air conditioning room to the air conditioning room.

This underfloor air conditioning system is shown in FIG.
As shown in, the conditioned air from the air conditioner 1 is supplied to the air supply duct 2
Through the discharge port 4 formed on one end side wall of the underfloor chamber 3 into the underfloor chamber 3. Underfloor chamber 3
The conditioned air discharged into the air conditioning room 7 is blown out from the plurality of air outlets 6, 6, ... Formed on the floor 5 into the air conditioning room 7, and then the plurality of suction devices 9 formed on the ceiling 8 of the air conditioning room 7. , 9 ... are sucked into the ceiling chamber 10 and circulated back to the air conditioner 1 via the return air duct 11.

Generally, in order to equalize the amount of air blown from the air outlets 6, 6, ... To the air-conditioning chamber 7, the air outlets 6, 6 ,. There are many. The blowout device 12 adopts a fan unit system provided with a fan or a damper system. Since the size of the discharge port 4 is the same as that of the air supply port 13 of the air conditioner 1, the wind speed discharged from the discharge port 4 into the underfloor chamber 3 is higher than 10 m / s. It is often discharged by. Furthermore, in recent years, office buildings have
There is a tendency to increase the height of the ceiling 8 to obtain a high-class feeling due to the spatial expansion. Therefore, the low floor type underfloor chamber 3 in which the height of the underfloor chamber 3 is lowered by the amount that the ceiling 8 is raised
Is adopted, and the wind speed discharged from the discharge port 4 tends to be further increased.

[0005]

However, in the conventional underfloor air conditioning system, when the wind speed of the conditioned air discharged from the discharge port 4 into the underfloor chamber 3 is high, as shown in FIG. The discharged conditioned air collides with the wall of the underfloor chamber 2 on the side opposite to the discharge port 4, and a swirling flow is generated that swirls toward the discharge port 4 side. By the way, each outlet 6,
The temperature of the conditioned air blown from 6, ... Is greatly influenced by the flow path of the conditioned air from the outlet 4 to the outlet 6, and the longer the flow path is, the lower the floor 5 surface of the air conditioning chamber 7 or the bottom of the underfloor chamber 3 is. The heat exchange with the wall increases and the temperature of the conditioned air fluctuates (in the case of cold air conditioning, the conditioned air temperature rises,
It becomes lower in case of warm air conditioning). From this, when a swirl flow is generated in the underfloor chamber 3, the conditioned air whose temperature has fluctuated and fluctuates with the conditioned air discharged from the discharge port 4, and the temperature distribution of the conditioned air in the underfloor chamber 3 is changed. Cause turbulence. As a result, the temperature of the conditioned air blown out from each of the air outlets 6, 6, ... Is non-uniform, so that there is a drawback that uneven temperature occurs in the air-conditioned room 7.

When a swirling flow is generated in the underfloor chamber 3, the pressure distribution of the conditioned air in the underfloor chamber 3 is not uniform, and the blown air amounts from the outlets 6, 6, ... Are non-uniform. There is a drawback that it promotes uneven temperature in the air-conditioned room. If you have a blowing device,
Although it is resolved to some extent, it is not a fundamental solution. The present invention has been made in view of such a situation, and prevents the swirling flow from being generated in the underfloor chamber, equalizes the blowing temperature and the blowing air amount of the conditioned air blown from the blowout ports, and It is an object of the present invention to provide an underfloor air conditioning system that can prevent temperature unevenness.

[0007]

In order to achieve the above object, the present invention discharges conditioned air into the underfloor chamber from a discharge port formed on one side wall of the underfloor chamber provided under the floor of the air-conditioning chamber. In the underfloor air conditioning system that blows out the discharged conditioned air into the air conditioning room from a plurality of outlets formed on the floor of the air conditioning room, a plurality of side walls on the other side wall side facing the discharge opening of the underfloor chamber A suction equalizing chamber divided by a relief damper is formed, and a discharge passage is provided for discharging the conditioned air sucked into the suction equalizing chamber via the relief damper to a place other than the underfloor chamber, and the discharge port is under the floor. By sucking the conditioned air discharged into the chamber into the suction equalizing chamber, the wind velocity distribution from the outlet to the suction equalizing chamber is introduced into the underfloor chamber. And wherein the generating an a one-way conditioned air flow.

[0008]

According to the present invention, the suction equalizing pressure divided by a plurality of relief dampers is provided on the other side wall side of the underfloor chamber opposite to the discharge port formed on one side wall of the underfloor chamber provided under the floor of the air conditioning room. A chamber is formed, and the conditioned air sucked into the suction pressure equalizing chamber through the relief damper is discharged to a place other than the underfloor chamber through a discharge path, and the conditioned air is discharged from the discharge port into the underfloor chamber. By sucking the air into the suction equalizing chamber, a one-way conditioned air flow with a uniform wind velocity distribution from the outlet to the suction equalizing chamber is generated in the underfloor chamber.

As a result, a swirling flow does not occur in the underfloor chamber even if the velocity of the conditioned air discharged from the discharge port is high, so that the pressure distribution and temperature distribution of the conditioned air in the underfloor chamber can be made uniform. . Therefore, the amount of blown air and the temperature of the air blown from the air outlets formed on the floor surface into the air conditioning chamber are made uniform, so that temperature unevenness does not occur in the air conditioning chamber.

A discharge equalizing chamber is also provided on the discharge port side of the underfloor chamber, and the discharge pressure discharged from the discharge port is equalized by the discharge equalizing chamber before the discharge equalizing chamber. The opening / closing means was configured to discharge the air into the underfloor chamber at a uniform wind speed. As a result, the wind velocity distribution of the airflow flowing through the underfloor chamber can be made more uniform.

Further, since the conditioned air discharged from the discharge passage is supplied to the perimeter zone of the air conditioning room, the conditioned air sucked into the suction equalizing chamber can be effectively used. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an underfloor air conditioning system according to the present invention will be described below in detail with reference to the accompanying drawings. As shown in FIG. 1, an underfloor chamber 24 having a double floor structure using a free access member is provided below the floor 22 of the air conditioning room 20, and an air conditioning room is provided behind the ceiling 26 of the air conditioning room 24. Ceiling chamber 28 with 20 air intakes
Is provided. At the plurality of outlets 30, 30, ... Formed on the surface of the floor 22, blower devices 32, 32 ... Of a fan unit type or a damper type for blowing the conditioned air supplied to the underfloor chamber 24 to the air conditioning chamber 20. Is provided,
Intake devices 34, 34, ... For sucking the return air of the air conditioning room 20 into the ceiling chamber 28 are provided on the surface of the ceiling 26.

An air conditioner 38 is provided in the machine room 36 adjacent to the air conditioner room 20, and the conditioned air conditioned by the air conditioner 38 is supplied to the underfloor chamber 24 via an air supply duct 40.
Air is supplied to the discharge port 42 formed at one end side of the
The return air in the air conditioning room 20 that has been sucked into the ceiling chamber 28 returns to the air conditioner 38 via the return air duct 44. Further, on the other side wall side of the underfloor chamber 24 facing the discharge port 42, a suction equalizing chamber 48 partitioned in the vertical direction by a plurality of suction relief dampers 46, 46 connected in parallel with the discharge port 42 is formed. Has been done. Also, the pressure equalizing chamber 4 for suction
An opening 50 is formed in the floor surface located on the upper surface of 8, and a suction equalizing chamber 48 is provided via a suction relief damper 46.
The conditioned air sucked inside is discharged from the opening 50 to the perimeter zone in which the window 52 of the air conditioning chamber 20 is formed.

A discharge equalizing chamber 54 having the same structure as the suction pressure equalizing chamber 48 is formed on the discharge port 42 side in the underfloor chamber 24, and the conditioned air discharged from the discharge port 42 is discharged. The pressure is discharged from the discharge relief dampers 56, 56 ... into the underfloor chamber 24 via the pressure equalizing chamber. The structure of the suction relief damper 46 and the discharge relief damper 56 may be such that the upper end of the flat plate-like flap is supported by a hinge and the lower end can be swung, or the flat plate fixed to the pressure equalizing chambers 48, 54. It is also possible to form a plurality of openings in the opening and attach the flaps to the openings so that the flap can swing.

Next, according to FIG. 2, the opening degree of each of the discharge relief dampers 56, 56 ... Of the discharge equalizing chamber 54,
Relief damper 4 for each suction of pressure equalizing chamber 48 for suction
An automatic control mechanism for automatically controlling the opening degrees of 6, 46, ... Will be described. As shown in FIG. 2, the automatic control mechanism controls the drive units 57 and 59 of the discharge relief dampers 56, 56 ... And the suction relief dampers 46, 46. And the opening detectors 60, 6 that individually detect the opening of each suction relief damper 46 and transmit the detected opening to the controller 58.
0, and a differential pressure gauge 62 that detects the differential pressure between the air-conditioning room 20 and the underfloor chamber 24 and sends it to the controller. Then, the opening degree of each of the suction relief dampers 46, 46 ... Detected by the opening degree detector 60 is determined by the controller 5
8 is input, the controller 58 causes the wind pressure distribution in the underfloor chamber 24 to be uniform based on the opening degree of the suction relief damper 46, so that the suction pressure equalizing chamber 48 is discharged from the discharge port 42.
The opening degree of each of the discharge relief dampers 56, 56 ... Is controlled so as to generate a one-way conditioned air flow toward the.

Further, the controller 58 has a pressure in the underfloor chamber 24 that is sufficient to blow out a predetermined amount of air from the blowing device 32 installed on the surface of the floor 22 based on the signal from the differential pressure gauge 62. Thus, the opening degree of each of the suction relief dampers 46, 46 ... Is adjusted. Although the opening degrees of the discharge relief damper 56 and the suction relief damper 46 are automatically controlled, the air conditioning room 20 and the underfloor chamber 24 are controlled.
If the internal pressure difference is substantially constant, it is not necessary to perform automatic control. That is, the opening degrees of the discharge relief dampers 56 and the suction relief dampers 46 are manually adjusted variously in advance to have sufficient pressure to blow out from the blowing device 32 into the underfloor chamber 24, and the wind velocity distribution is The opening may be fixed at a level at which a one-way conditioned air flow from the discharge port 42 toward the suction equalizing chamber 48 is generated uniformly.

The discharge port 42 is the air supply port 3 of the air conditioner 38.
Since it is formed with the same opening area as that of No. 9, it is considerably smaller than the area of the underfloor chamber 24 wall where the discharge port 42 is formed. Therefore, the discharge pressure is high in the vicinity of the discharge port 42, so that the wind speed is fast, but the wind speed becomes slower as the distance from both sides of the discharge port 42 increases. Therefore, when the discharge equalizing chamber 54 is used, the conditioned air discharged from the discharge port 42 is pressure-equalized in the discharge equalizing chamber 54, and each of the discharge relief dampers 5 is discharged.
Since it is discharged into the underfloor chamber 24 from 6, 56 ...
There is an advantage that the wind velocity distribution in the underfloor chamber 24 can be easily made uniform. However, in the case where the discharge equalizing chamber 54 is not used, the opening degree of the suction relief damper 46 is individually adjusted to have a pressure sufficient to blow out from the blowing device 32 into the underfloor chamber 24, and the wind speed. Distributing port 4 with uniform distribution
A one-way conditioned air flow may be generated from 2 toward the suction equalizing chamber 48.

Next, the operation of the underfloor air conditioning system configured as described above will be described. The conditioned air conditioned by the air conditioner 38 is supplied into the discharge equalizing chamber 54 from the discharge port 42 via the air supply duct 40. The conditioned air supplied into the discharge equalizing chamber 54 has its discharge pressure equalized by the discharge equalizing chamber 54, and is discharged into the underfloor chamber 24 from the discharge relief dampers 56, 56 ... at a uniform wind speed. To be done. Then, the conditioned air discharged into the underfloor chamber 24 has a sufficient pressure to be blown out from the blowing device 32, and is unidirectional as shown in FIG. 3 (a plan view of the inside of the underfloor chamber 24). Relief damper 4 for each suction flows as an air-conditioned air flow with a uniform wind speed distribution.
6, 46 ... Are sucked into the suction equalizing chamber 48. As a result, a swirling flow does not occur in the underfloor chamber 24 even if the air velocity of the conditioned air discharged from the discharge port 42 is high, so that the pressure distribution and temperature distribution of the conditioned air in the underfloor chamber 24 can be made uniform. . Therefore, the blowing air volume and the blowing temperature blown into the air conditioning room 20 from the blowing equipments 32 provided in the plurality of air outlets 30, 30, ... Formed on the floor 22 are made uniform, and temperature unevenness occurs in the air conditioning room 20. Since it does not, a comfortable air conditioning environment can be formed.

The conditioned air sucked into the suction pressure equalizing chamber 48 flows out from the opening 50 of the suction pressure equalizing chamber 48 into the perimeter zone of the air conditioning chamber 20. As a result, the conditioned air sucked into the suction equalizing chamber 48 can be effectively used. In the present embodiment, an example in which a blowout device is provided at the blowout port has been described, but the underfloor air-conditioning system of the present invention can achieve the same effect without a blowout device. In addition, although the discharge equalizing chamber and the suction equalizing chamber are formed in the underfloor chamber as an example,
The same effect can be obtained when it is formed on the ceiling chamber.

[0020]

As described above, according to the underfloor air conditioning system of the present invention, the suction equalizing chamber is provided on the wall side facing the discharge port of the underfloor chamber and the suction equalizing chamber is sucked. The stored conditioned air is discharged through the discharge path to a place other than the underfloor chamber, and the conditioned air discharged into the underfloor chamber from the discharge port is sucked into the suction equalizing chamber, thereby sucking it into the underfloor chamber from the discharge port. A one-way conditioned air flow with a uniform wind velocity distribution toward the pressure equalizing chamber is generated. As a result, no swirling flow is generated in the underfloor chamber, so that the amount and temperature of air blown out from the air outlets formed on the floor into the air conditioning chamber are made uniform, and no temperature unevenness occurs in the air conditioning chamber.

Further, by providing a discharge equalizing chamber also on the discharge port side of the underfloor chamber, the flow velocity distribution of the air flow flowing through the underfloor chamber can be made more uniform.
Further, since the conditioned air discharged from the discharge passage is supplied to the perimeter zone of the air conditioning room, the conditioned air sucked in the suction equalizing chamber can be effectively used.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an underfloor air conditioning system according to the present invention

FIG. 2 is an explanatory diagram in the case of automatically controlling the opening degree of the discharge relief damper and the suction relief damper of the present invention.

FIG. 3 is an explanatory diagram illustrating a flow of conditioned air flowing through an underfloor chamber of an underfloor air conditioning system according to the present invention.

FIG. 4 is a sectional view of a conventional underfloor air conditioning system.

FIG. 5 is an explanatory diagram illustrating a flow of conditioned air flowing through an underfloor chamber of a conventional underfloor air conditioning system.

[Explanation of symbols]

 20 ... Air conditioning room 22 ... Floor 24 ... Underfloor chamber 26 ... Ceiling 28 ... Ceiling chamber 30 ... Air outlet 34 ... Intake device 38 ... Air conditioner 42 ... Discharge port 46 ... Suction relief damper 48 ... Suction equalizing chamber 54 ... Discharge Pressure equalizing chamber 56 ... Discharge relief damper

Claims (3)

[Claims] 1. Air-conditioned air is discharged into the under-floor chamber from a discharge port formed on one side wall of the under-floor chamber provided under the floor of the air-conditioning chamber, and the discharged conditioned air is formed on the floor surface of the air-conditioning chamber. In an underfloor air conditioning system that blows out from a plurality of outlets to an air conditioning room, on the other side wall side facing the discharge port of the underfloor chamber, a suction equalizing chamber partitioned by a plurality of relief dampers is formed, and the relief is provided. An exhaust passage is provided for exhausting the conditioned air sucked into the suction equalizing chamber via a damper to a place other than the underfloor chamber, and the conditioned air discharged into the underfloor chamber from the outlet is provided to the suction equalizing chamber. By sucking air into the underfloor chamber, a one-way conditioned air flow with a uniform wind velocity distribution from the outlet to the pressure equalizing chamber for suction is generated. Under-floor air-conditioning system to be. 2. An air-conditioning air discharged from a discharge port is provided on the discharge port side of the underfloor chamber facing the suction pressure-equalizing chamber, and having a discharge pressure-equalizing chamber having the same structure as the suction pressure-equalizing chamber. The discharge pressure of the discharge pressure equalizing chamber is equalized so that each opening / closing means of the discharge pressure equalizing chamber discharges into the underfloor chamber at a uniform wind speed. Underfloor air conditioning system. 3. The underfloor air conditioning system according to claim 1, wherein the conditioned air discharged from the discharge passage is supplied to the perimeter zone of the air conditioning room.