JPH06193949A - Air conditioning system - Google Patents

Abstract

PURPOSE:To provide an air conditioning system in which an irregular distribution of temperature within an office room and a comfortable feeling within the office room can be improved. CONSTITUTION:Conditioned air 54 got from an air conditioner 40 is supplied from a supplying port 42 of an under-floor chamber 28 into the under-floor chamber 28 and then the air is blown from fan devices 32 fixed to a plurality of air blowing ports 26 formed at a surface of a floor 24 into an office room 22. Each of a temperature sensor 46 and a pressure sensor 48 for the conditioned air 54 within the under-floor chamber 28 is arranged at positions of the fan devices 32 near the supplying port 42 and far from the supplying port 42. Both temperature and pressure distributions within the under-floor chamber 28 are calculated in reference to detected values of the temperature sensor 46 and the pressure sensor 48 under an operation of a calculation device 52. Blown air volume of the fan devices 32 are calculated in such a manner that heating amount for the conditioned air 54 blown from each of the blowing ports 26 into the chamber 22 becomes uniform in response to the distribution, and as a result of this calculation, a blowing air volume of each of the fan devices is controlled by a controller 58, so that no irregular distribution of temperature occurs in the office room 22 and then comfortable feeling can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system,
In particular, the present invention relates to an air conditioning system in which temperature distribution and pressure distribution of conditioned air are generated in the underfloor chamber because the conditioned air is supplied from one end side of the underfloor chamber.

[0002]

2. Description of the Related Art In recent years, in office buildings and the like in which a large number of automation equipment (OA equipment) are installed, the floor is formed as a double floor such as a free access floor and the power wiring for the OA equipment is Wiring between spaces is becoming more common. Along with this, this space is used as an underfloor chamber for supplying the conditioned air from the air conditioner, and conditioned air for heating or cooling is supplied to the space and is attached to the air outlet formed on the floor surface. The air conditioning system that discharges the conditioned air into the office to perform air conditioning has been implemented.

As shown in FIG. 2 of a conventional air conditioning system having a blowout unit, the conditioned air 2 whose temperature is adjusted by an air conditioner 1 is provided at one end of an underfloor chamber 3 formed of a double floor. Air supply port 2 for conditioned air 2 to underfloor chamber 3
Supplied within. The blow-out units 7, 7 attached to the plurality of blow-out openings 6, 6 ... Formed on the floor surface 5, respectively.
Is taken into the ... And blown out from the blowout unit 7 into the office room 8 through the blowout port 6. The conditioned air 2 blown into the office room 8 rises in the office room 8 and is sucked into the ceiling chamber 10 as return air from a plurality of air intake devices 9, 9 ... Installed on the ceiling. A part of the return air 11 sucked into the ceiling chamber 10 is exhausted to the outside of the system through the return air duct 12, and is mixed with the fresh outside air 13 introduced and returned to the air conditioner 1. In the air conditioner 1, the temperature is adjusted by the cooler 1A and the heater 1B, and the air supply port 4 is adjusted by the blower 1C.
Is again supplied to the underfloor chamber 3.

Further, since the demand for comfortable air conditioning has been increasing in recent years, as described above, the blowing unit 7 is provided at the blowout port 6 so that the amount of air blown into the office 8 is made uniform. There is. As a blowout unit 7 that is normally used, there is a fan unit system in which a fan is provided in a small chamber that communicates the blowout port 6 and the underfloor chamber 3. Further, instead of providing the blow-out unit 7 that forcibly blows the conditioned air 2 from the blow-out port 6, the under-floor chamber 3 is made to be a pressure equalizing chamber, and a damper is provided at the blow-out port 6 so that the blow-out port 6 can be installed in the office room. There is also a system in which the air volume of the conditioned air 2 blown into the inside 8 is uniformly adjusted by the opening degree of the damper.

[0005]

However, the conventional air conditioning system has the following drawbacks. (1) FIG. 3 is a diagram showing the relationship between the distance from the air supply port 4 of the underfloor chamber 3 to the blowout unit 7 and the pressure in the underfloor chamber 3 and the amount of blown air by the blowout unit 7. . As can be seen from this figure, the pressure in the underfloor chamber 3 is low near the air supply port 4,
As the distance from the air supply port 4 increases, the pressure gradually increases, reaches the maximum, and then decreases again. The conditioned air 2 blown out from the blowout unit 7 under the influence of this pressure.
The amount of airflow also changes. The reason why the pressure is low at a distance close to the air supply port 4 is that the airflow in the office 8 tends to be attracted to the air in the office 8 because the flow velocity of the conditioned air 2 is high in the vicinity of the air supply port 4. The generation of this pressure distribution is determined by the capacity of the blower 1C of the air conditioner 1 and the operating state, the size of the underfloor chamber 3, and the like, not to mention the case where the blowout unit 7 forcibly blowing out the conditioned air 2 is not provided. Even if it is, the distribution of air is affected by the pressure distribution, and the higher the pressure, the larger the blown air volume. By the way, the length of the underfloor chamber 3 is 30m.
In the case of, the difference between the maximum and minimum pressures was reported to be about 3 mmAq. As a result, the amount of conditioned air 2 blown out from each outlet 6 varies. (2) As shown in FIG. 4, when the air-conditioning system using the double floors of each floor of the building has a laminated structure for each floor, the underfloor chamber 3 and the ceiling chamber 10 sandwich the concrete slab 15 between them. Will be formed. Thereby, for example, in the case of cooling and air conditioning, the cold heat of the conditioned air 2 supplied into the underfloor chamber 3 is the heat of the return air 11 flowing through the ceiling chamber 10 via the slab 15 (such as OA equipment in the office 8). Is heated by).
Therefore, as shown in FIG. 5, the temperature distribution of the conditioned air 2 in the underfloor chamber 3 becomes higher as it is farther from the air supply port 4 (in the case of heating and air conditioning, the conditioned air 2 in the underfloor chamber 3 is The farther from the air supply port 4, the lower the temperature). Further, the cause of this temperature distribution is generated not only by the heat exchange between the conditioned air 2 and the return air 11, but also by the influence of the outside air. That is, since the outside portion of the slab 15 near the outer wall 16 is more easily affected by the outside air temperature than the inside portion, a temperature difference occurs between the outside portion and the inside portion of the slab 15, and the temperature of the conditioned air 2 in the underfloor chamber 3 is increased. Affect. Due to these factors
A temperature distribution is generated in the conditioned air 2 in the underfloor chamber 3, causing variations in the temperature of the conditioned air 2 blown out from each outlet 6 of the underfloor chamber 3. Incidentally, it has been reported that the temperature distribution of the conditioned air 2 in the underfloor chamber 3 has a difference between the maximum and minimum temperatures of about 2 ° C. when the floor area is about 600 m ² .

When the temperature distribution and the pressure distribution are generated in the conditioned air 2 in the underfloor chamber 3 due to the above reasons, the heat quantity of the conditioned air 2 blown out from the outlets 6 into the office 8 per unit time is not uniformed. Therefore, there is a drawback that unevenness in temperature (variation) occurs in the office room 8 and comfort is impaired. The present invention has been made in view of such a situation, and since it is possible to make the heat quantity of the conditioned air blown into the office room from a plurality of outlets uniform, it is possible to prevent uneven temperature in the office room and It is an object of the present invention to provide an air conditioning system capable of improving the comfort of passengers.

[0007]

In order to achieve the above-mentioned object, the present invention supplies a plurality of conditioned air from an air conditioner into the underfloor chamber from an air supply port of the underfloor chamber to form a plurality of air conditioners formed on the floor surface. In an air conditioning system that blows out the conditioned air into an air conditioned room by blowing means respectively attached to the air outlets, an air conditioner in the underfloor chamber is provided in the underfloor chamber near the air supply port and at a position away from the air supply port. A temperature sensor for detecting the temperature of air and a pressure sensor for detecting the pressure are provided,
While calculating the temperature distribution and the pressure distribution of the conditioned air in the underfloor chamber from the detection values of the temperature sensor and the pressure sensor, the heat quantity of the conditioned air blown into the air conditioning room from the plurality of outlets according to the temperature distribution and the pressure distribution is The present invention is characterized in that arithmetic means for arithmetically operating the blowing air volume of each of the blowing means is provided so as to be uniform, and control means for controlling the blowing air volume of each of the blowing means is provided based on the arithmetic result of the arithmetic means.

[0008]

According to the present invention, the conditioned air supplied from the air conditioner into the underfloor chamber is provided with a temperature sensor provided in the underfloor chamber in the vicinity of the conditioned air supply port and at a position distant from the air supply port. Temperature and pressure are detected by the pressure sensor and input to the calculation means. Next, in the calculating means, the temperature distribution and the pressure distribution of the conditioned air in the underfloor chamber are calculated from the temperature and the pressure, and the heat quantity of the conditioned air blown from each outlet to the air conditioning room is calculated according to the temperature distribution and the pressure distribution. The blown air volume of each blowing means is calculated so as to be uniform. Then, based on the result of this calculation, the control means controls the blowing air volume of each blowing means. That is, in the temperature distribution within the underfloor chamber, the air volume of the blowing means at a high temperature location is reduced and the air volume of the blowing means at a low temperature location is increased. Similarly, in the pressure distribution in the underfloor chamber, the air volume of the blowing means at a high pressure location is reduced, and the air volume of the blowing means at a low pressure location is increased.

As a result, the air volume of each blowing means can be controlled according to the temperature distribution and the pressure distribution of the conditioned air in the underfloor chamber. Therefore, the heat quantity of the conditioned air blown out from each outlet into the air-conditioned room becomes uniform, and the temperature unevenness does not occur in the air-conditioned room, so that the comfort in the air-conditioned room can be improved. Instead of individually controlling the blowing means by the control means, the blowing means may be divided into groups according to the distance from the one end side of the underfloor chamber, and the control means may control each of the groups.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of an air conditioning system 20 according to the present invention will be described in detail below with reference to the accompanying drawings. As shown in FIG. 1 of the air conditioning system 20 of the present invention, a plurality of outlets 26, 26 ... Are formed on the floor 24 surface of the office room 22 and an underfloor chamber 28 is provided under the floor 24. Further, in the underfloor chamber 28, there are provided a plurality of fan units 32, 32 ... In which a fan 30 is mounted in a small chamber that communicates the air outlet 26 with the underfloor chamber 28. A ceiling chamber 34 is formed behind the ceiling of the office room 22, and a plurality of air intake devices 38, 38 ... Are attached to the surface of the ceiling 36. An air supply port 42 for supplying conditioned air from the air conditioner 40 to the underfloor chamber 28 is formed on one end side of the underfloor chamber 28. Furthermore, the return air duct 44 extending from the ceiling chamber 34 is connected to the intake side of the air conditioner 40.

The air conditioner 40 comprises a blower 40A, a heating coil 40B, and a cooling coil 60C in this order from the air supply side. Next, the improved portion of the present invention will be described. In the underfloor chamber 28, the vicinity of the air supply port 42 and the air supply port 42 are provided.
, And the pressure sensor 4 in the vicinity of the fan unit 32 farthest from the
Are provided respectively, and the temperature sensor 46 and the pressure sensor 48 are connected to the arithmetic unit 52 via respective signal cables 50, 50. The arithmetic unit 52 calculates the temperature distribution and the pressure distribution of the conditioned air 54 in the underfloor chamber 28 from the detection values of the temperature sensors 46 and the pressure sensors 48, and the offices from the outlets 26 according to the temperature distribution and the pressure distribution. The amount of air blown from each fan unit 32 is calculated so that the amount of heat of the conditioned air 54 blown into the chamber 22 becomes uniform. Further, the arithmetic unit 52 is connected to a controller 58 via a signal cable 56,
The controller 58 includes respective signal cables 60, 60,
It is connected to each fan unit 32 via 60. As a result, the controller 58 controls the rotation speed of the fan 30 of the fan unit 32 based on the calculation result calculated by the calculation device 52.

Next, the operation of the air conditioning system 20 of the present invention configured as described above will be described. The conditioned air 54 whose temperature is adjusted by the air conditioner 40 is supplied to the supply port 42 of the underfloor chamber 28.
From the underfloor chamber 28. Then, the pressure sensor 48 provided in the underfloor chamber 28 detects the pressure at a predetermined position in the underfloor chamber 28, and inputs the pressure to the arithmetic unit 52. In the arithmetic unit 52, each pressure sensor 4
The pressure distribution in the underfloor chamber 28 is calculated from the pressure data of No. 8, and the pressure at each position of each fan unit 32 is obtained from this pressure distribution. Then, the blow-out air volume of each fan unit 32 is calculated by the obtained each pressure and the “relational expression between the pressure inside the underfloor chamber 28 and the blow-out air volume of the fan unit 32” which is input to the arithmetic unit 52 in advance. To be done. Next, when this calculation result is input to the controller 58, the controller 58 individually controls the number of rotations of the fan 30 of each fan unit 32 so that the calculated air volume is obtained.

Similarly, the temperature sensor 46 provided in the underfloor chamber 28 detects the temperature at a predetermined position in the underfloor chamber 28 and inputs it to the arithmetic unit 52. Then, the calculation device 52 calculates the temperature distribution in the underfloor chamber 28 from the temperature data of each temperature sensor 46, and the temperature at each position of each fan unit 32 is obtained from this temperature distribution. Then, according to the following equation (1) input to the arithmetic unit 52 in advance, the amount of blown air (Q _i) of each fan unit 32 is adjusted so that the heat quantity of the conditioned air 54 blown into each office room 22 from each outlet 26 becomes uniform. ) Is calculated. Next, when the calculation result is input to the controller 58,
The controller 58 individually controls the number of rotations of the fan 30 of each fan unit 32 so that the calculated air volume is obtained.

(T−t _i ) Q _i = A / (B × C) (1) T: Indoor set temperature t _i : Air temperature at each fan unit position calculated from the temperature distribution curve Q _i : Each fan unit Per unit time A: Heat load in the office room B: Air specific gravity C: Air specific heat In addition, A / (B × C) in the above formula (1) was obtained by measuring the heat load condition in the office room 22 in advance. Use a fixed value. Further, the fixed value may be corrected depending on the fluctuation of the heat load condition, for example, the use condition of the heating element such as the OA equipment 62, 62, or for each season.

As described above, the blowing air volume is calculated for each blowing unit 32 according to the temperature distribution and the pressure distribution, and the rotation speed of the fan 30 of the blowing unit 32 is determined accordingly. As a result, the heat quantity of the conditioned air 54 blown into the office room 22 from each outlet 26 can be made uniform. Thus, in the air conditioning system 20 of the present invention,
According to the temperature distribution and the pressure distribution of the conditioned air 54 in the underfloor chamber 28, the amount of air blown from each fan unit 32 is controlled so that the amount of heat of the conditioned air 54 blown from each outlet 26 into the office room 22 becomes uniform. You can As a result, the heat quantity of the conditioned air blown from the outlets 26 into the office 22 becomes uniform, and the uneven temperature does not occur in the office 22, so that the comfort in the office 22 can be improved.

Further, the fan units 32 are not individually controlled by the controller 58, but the fan units 32 are grouped according to the distance from the air supply port 42 of the underfloor chamber 28, and the controller 58 controls each of the groups. You may The formula for calculating the blown air volume of each fan unit 32 according to the temperature distribution is not limited to the formula (1) used in the present embodiment, and the air outlets 26 from the outlets 26 are distributed according to the temperature distribution at each fan unit 32 position. Any formula may be used as long as it can calculate the amount of air blown from the fan unit 32 so that the heat quantity of the conditioned air 54 blown into the office room 22 can be made uniform. Further, in this embodiment, the so-called underfloor air conditioning system in which the conditioned air 54 is blown out from the underfloor chamber 28 into the office room 22 has been described, but the feature of the air conditioning system of the present invention is that the fan unit 32 is installed in the ceiling chamber 34. Thus, the present invention can also be applied to a ceiling blowout air conditioning system that blows out from the fan unit 32 into the office room 22. Further, in this embodiment, the outlet 2
Although the example in which the fan unit 32 is attached to 6 has been described, the present invention is not limited to this, and the underfloor chamber 28 is used as a pressure equalizing chamber, a damper is attached to the outlet 26, and the opening of the damper is controlled by the controller 58. You may do it.

Further, as in the present embodiment, the amount of air blown out from the fan unit 32 is not controlled, but a blowout unit having a heat exchanger in the fan unit 32 is provided in the underfloor chamber and blown out from each blowout unit. The controller 54 may control the cold water or hot water of the heat exchanger while keeping the air volume constant.

[0018]

As described above, according to the air-conditioning system of the present invention, the heat quantity of the conditioned air blown out from each outlet into the air-conditioned room becomes uniform according to the temperature distribution and pressure distribution generated in the underfloor chamber. As described above, the blowing air volume of each blowing means can be controlled. As a result, the heat quantity of the conditioned air blown out from the outlets into the air-conditioned room becomes uniform and the temperature unevenness does not occur in the air-conditioned room, so that the comfort in the air-conditioned room can be improved.

[Brief description of drawings]

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

FIG. 2 is a block diagram of a conventional air conditioning system

FIG. 3 is an example diagram showing a pressure distribution in an underfloor chamber and an air volume from a blowout unit.

FIG. 4 is a cross-sectional view illustrating the positional relationship between conditioned air and return air in an office building or the like in which floors are stacked.

FIG. 5 is an example diagram showing a temperature distribution of conditioned air in an underfloor chamber.

[Explanation of symbols]

 20 ... Air-conditioning system 22 ... Office 26 ... Outlet 28 ... Underfloor chamber 32 ... Fan unit 40 ... Air conditioner 42 ... Supply port 46 ... Temperature sensor 48 ... Pressure sensor 52 ... Arithmetic device 54 ... Air conditioning 58 ... Controller

Claims (2)

[Claims] 1. A conditioned air from an air conditioner is supplied from an air supply port of the underfloor chamber into the underfloor chamber, and the conditioned air is blown out by a blowing means attached to each of a plurality of air outlets formed on the floor surface. In the air conditioning system blowing out to, in the vicinity of the air supply port in the underfloor chamber and at a position away from the air supply port, a temperature sensor for detecting the temperature of the conditioned air in the underfloor chamber and a pressure sensor for detecting the pressure are provided. The temperature distribution and the pressure distribution of the conditioned air in the underfloor chamber are calculated from the detection values of the temperature sensor and the pressure sensor, respectively, and the conditioned air blown from the plurality of outlets to the air conditioning room according to the temperature distribution and the pressure distribution. The calculation means for calculating the blowing air volume of each of the blowing means is provided so that the heat quantity of each blowing means becomes uniform, and the blowing of each blowing means is performed based on the calculation result of the computing means. An air-conditioning system comprising a control means for controlling the amount of air flow. 2. The air conditioning system according to claim 1, wherein the blowing means is divided into groups according to a distance from the air supply port, and the blowing means is controlled by the control means for each group.