JP3087486B2 - Air conditioning system - 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 system,
In particular, the present invention relates to an air conditioning system in which the temperature distribution and the pressure distribution of the conditioned air are generated in the underfloor chamber because the conditioned air is supplied from one end 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 with a free access floor or the like, and power wiring and the like for the OA equipment are connected to the double floor. Wiring between spaces is increasing. Accordingly, this space is used as an underfloor chamber for supplying air-conditioned air from an air conditioner, and air-conditioning air for heating or cooling is supplied thereto, and a blow-off unit attached to an air outlet formed on the floor surface. An air-conditioning system for discharging air-conditioned air into an office room to perform air-conditioning has been implemented.

[0003] As shown in Fig. 2 showing a conventional air-conditioning system having a blow-out unit, 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. From the air supply port 4 of the conditioned air 2 to the underfloor chamber 3
Supplied within. The outlet units 7, 7 attached to a plurality of outlets 6, 6,... Formed on the floor 5, respectively.
Are blown into the office room 8 from the blow-out unit 7 through the blow-out port 6. The air-conditioned air 2 blown into the office room 8 rises in the office room 8 and is taken into the ceiling chamber 10 as return air from a plurality of air intakes 9 provided on the ceiling. A part of the return air 11 sucked into the ceiling chamber 10 is exhausted out of the system through the return air duct 12, mixed with the fresh air 13 introduced, and returned to the air conditioner 1. In the air conditioner 1, the temperature is controlled by the cooler 1A and the heater 1B, and the air supply port 4 is controlled by the blower 1C.
To the underfloor chamber 3 again.

In recent years, since the demand for comfortable air conditioning has been increasing, the air outlet unit 7 is provided at the air outlet 6 as described above to make the air volume blown into the office room 8 uniform. I have. As the blowout unit 7 that is usually used, there is a fan unit system in which a fan is provided in a small chamber that connects the blowout port 6 and the underfloor chamber 3. Also, instead of providing a blow-off unit 7 for forcibly blowing out the conditioned air 2 from the blow-out port 6, the underfloor chamber 3 is made to be a pressure equalizing chamber, a damper is provided in the blow-out port 6, and an office There is also a method of uniformly adjusting the flow rate of the conditioned air 2 blown into the chamber 8 by the opening degree of the damper.

[0005]

However, the conventional air conditioning system has the following disadvantages. (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, the pressure in the underfloor chamber 3, and the amount of air blown by the blowout unit 7. . As can be seen from this figure, the pressure in the underfloor chamber 3 is low at a position close to the air supply port 4,
As the distance from the air inlet 4 increases, the pressure gradually increases and reaches a maximum, and then decreases again. The conditioned air 2 blown from the blow-off unit 7 is affected by this pressure.
Also changes the air volume. The pressure is low at a distance close to the air supply port 4 because the flow rate of the conditioned air 2 near the air supply port 4 is high, so that the air in the office room 8 tends to be drawn in reverse. The occurrence of this pressure distribution is determined by the capacity and operating condition of the blower 1C of the air conditioner 1, the size of the underfloor chamber 3, and the like. In this case, the pressure distribution is also affected, and the higher the pressure, the larger the amount of air blown out. By the way, the length of the underfloor chamber 3 is 30m
In the case of, there is a report that the difference between the maximum and minimum pressures was about 3 mmAq. As a result, the amount of air blown out of the conditioned air 2 blown out from each outlet 6 varies. (2) As shown in FIG. 4, when the air-conditioning system using the double floor 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 therebetween. Will be formed. Thereby, for example, in the case of cooling air conditioning, the cool air of the conditioned air 2 supplied into the underfloor chamber 3 is heated by the return air 11 flowing through the ceiling chamber 10 via the slab 15 (such as OA equipment in the office 8). Affected).
For this reason, as shown in FIG. 5, the temperature distribution of the conditioned air 2 in the underfloor chamber 3 is such that the temperature increases as the distance from the air supply port 4 increases. (The temperature decreases as the distance from the air supply port 4 increases.) The temperature distribution is caused not only by heat exchange between the conditioned air 2 and the return air 11 but also by the influence of outside air. That is, since the outer portion of the slab 15 near the outer wall 16 is more susceptible to the outside air temperature than the inner portion, a temperature difference occurs between the outer portion and the inner portion of the slab 15 and the temperature of the conditioned air 2 in the underfloor chamber 3. Affect. Due to these factors,
A temperature distribution is generated in the conditioned air 2 in the underfloor chamber 3, causing a variation 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 maximum and minimum difference 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-mentioned cause, the calorific value of the conditioned air 2 blown out from each outlet 6 into the office room 8 per unit time is not uniform. Therefore, there is a disadvantage that temperature unevenness (variation) occurs in the office 8 and comfort is impaired. The present invention has been made in view of such circumstances, and since the calorific value of the conditioned air blown into the office room from the plurality of outlets can be made uniform, temperature unevenness in the office room can be prevented, and It is an object of the present invention to provide an air conditioning system capable of improving the comfort of a building.

[0007]

According to the present invention, in order to achieve the above object, a plurality of air-conditioning air supplied from an air conditioner is supplied from an air supply port of an under-floor chamber into the under-floor chamber. In an air conditioning system in which the conditioned air is blown into an air-conditioning room by blowing means respectively attached to blow-off ports, air-conditioning in the under-floor chamber is provided in the under-floor chamber near the air supply port and at a position away from the air supply port. A temperature sensor for detecting the temperature of the air and a pressure sensor for detecting the pressure are provided, respectively.
The temperature distribution and the pressure distribution of the conditioned air in the underfloor chamber are calculated from the detected values of the temperature sensor and the pressure sensor, and the calorific value of the conditioned air blown out from the plurality of outlets into the air conditioning room according to the temperature distribution and the pressure distribution is calculated. A calculation means for calculating the air flow rate of each of the blow means so as to be uniform is provided, and a control means for controlling the air flow rate of each blow means based on the calculation result of the calculation means is provided.

[0008]

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

Thus, it is possible to control the air volume of each blowing means according to the temperature distribution and the pressure distribution of the conditioned air in the underfloor chamber. Therefore, the calorific value of the air-conditioned air blown out from each outlet into the air-conditioned room becomes uniform, and the temperature in the air-conditioned room does not become uneven, so that the comfort in the air-conditioned room can be improved. Further, instead of controlling the blowout means individually by the control means, the blowout means may be grouped according to the distance from the one end side of the underfloor chamber, and the control means may be controlled for each group.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an air conditioning system 20 according to the present invention will be described below in detail with reference to the accompanying drawings. As shown in FIG. 1, a plurality of air outlets 26 are formed on the floor 24 of the office room 22, and an underfloor chamber 28 is provided below 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 outlet 26 with the underfloor chamber 28. Further, a ceiling chamber 34 is formed behind the ceiling of the office room 22, and a plurality of air intakes 38 are attached to the surface of the ceiling 36. At one end of the underfloor chamber 28, an air supply port 42 for supplying conditioned air from the air conditioner 40 to the underfloor chamber 28 is formed. Further, a 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 order from the air supply side. Next, a description will be given of an improved portion of the present invention.
Temperature sensors 46, 46,... And a pressure sensor 4 in the vicinity of the fan unit 32 farthest from the
Are provided, and the temperature sensor 46 and the pressure sensor 48 are connected to the arithmetic unit 52 via signal cables 50, 50, respectively. 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 performs the operation from each outlet 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. Thus, 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 according to the present invention having the above-described configuration will be described. The conditioned air 54 whose temperature has been adjusted by the air conditioner 40 is supplied to the supply port 42 of the underfloor chamber 28.
To the underfloor chamber 28. Then, the pressure at a predetermined position in the underfloor chamber 28 is detected by each of the pressure sensors 48 disposed in the underfloor chamber 28 and input to the arithmetic unit 52. In the arithmetic unit 52, each pressure sensor 4
8, the pressure distribution in the underfloor chamber 28 is calculated, and the pressure at each position of each fan unit 32 is obtained from the pressure distribution. Then, the blow-off air volume of each fan unit 32 is calculated from the obtained pressures and the “relational expression between the pressure in the under-floor chamber 28 and the blow-off air volume of the fan unit 32” input to the arithmetic unit 52 in advance. Is 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 at a predetermined position in the underfloor chamber 28 is detected by each of the temperature sensors 46 disposed in the underfloor chamber 28 and input to the arithmetic unit 52. Then, the arithmetic unit 52 calculates the temperature distribution in the underfloor chamber 28 from the temperature data of each temperature sensor 46, and calculates the temperature for each position of each fan unit 32 from this temperature distribution. Then, according to the following equation (1), which has been input to the arithmetic unit 52 in advance, the blow-off air volume (Q _i) of each fan unit 32 is controlled such that the heat amount of the conditioned air 54 blown out from each outlet 26 into the office room 22 becomes uniform. ) Is calculated. 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.

(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 A: heat load in office room B: specific gravity of air C: specific heat of air In the above equation (1), A / (B × C) is a measure of the heat load in office room 22 in advance. Use fixed values. Further, the fixed value may be corrected according to a change in the heat load state, for example, the use state of the heating element such as the OA equipment 62, 62, or every 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 number of rotations of the fan 30 of the blowing unit 32 is determined accordingly. Thereby, the calorific value of the conditioned air 54 blown out from each outlet 26 into the office room 22 can be made uniform. Thus, in the air conditioning system 20 of the present invention,
In accordance with 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 out from each outlet 26 into the office room 22 becomes uniform. Can be. Thereby, the calorific value of the conditioned air blown out from each outlet 26 into the office room 22 becomes uniform, and the temperature in the office room 22 does not become uneven, so that the comfort in the office room 22 can be improved.

Instead of controlling the fan units 32 individually by the controller 58, 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 group. It may be. Note that the formula for calculating the amount of air blown from each fan unit 32 according to the temperature distribution is not limited to the formula (1) used in the present embodiment, but is calculated from each outlet 26 according to the temperature distribution at the position of each fan unit 32. Any formula can be used as long as the amount of air blown from the fan unit 32 can be calculated so that the amount of heat 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. Therefore, the present invention is also applicable to a ceiling blowout air conditioning system that blows air from the fan unit 32 into the office room 22. In this embodiment, the outlet 2
6, the fan unit 32 has been described as an example. However, the present invention is not limited to this. A damper is mounted on the outlet 26 with the underfloor chamber 28 as a pressure equalizing chamber, and the opening degree of the damper is controlled by the controller 58. You may do so.

Further, instead of controlling the amount of air blown out from the fan unit 32 as in the present embodiment, a blowout unit having a heat exchanger built in the fan unit 32 is provided in the underfloor chamber, and blowout of each blowout unit is performed. The air volume may be kept constant, and the controller 54 may control the cold or hot water of the heat exchanger.

[0018]

As described above, according to the air-conditioning system according to the present invention, the calorific value 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. Thus, the amount of air blown from each blowing means can be controlled. Thereby, the calorific value of the conditioned air blown out from each outlet into the air-conditioned room becomes uniform, and the temperature in the air-conditioned room does not become uneven, so that the comfort in the air-conditioned room can be improved.

[Brief description of the drawings]

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

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

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

FIG. 4 is a cross-sectional view illustrating a positional relationship between air-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 the underfloor chamber.

[Explanation of symbols]

 Reference Signs List 20 air conditioning system 22 office room 26 outlet 28 underfloor chamber 32 fan unit 40 air conditioner 42 supply port 46 temperature sensor 48 pressure sensor 52 arithmetic unit 54 air-conditioned air 58 controller

Claims (2)

(57) [Claims] 1. An underfloor chamber is supplied with air-conditioned air from an air conditioner from an air supply port of the underfloor chamber into the underfloor chamber, and the conditioned air is blown by blowing means respectively attached to a plurality of outlets formed on the floor surface. In the air-conditioning system that blows out, a temperature sensor for detecting the temperature of the conditioned air in the under-floor chamber and a pressure sensor for detecting pressure in the under-floor chamber near the air supply port and at a position away from the air supply port. Calculated air temperature and pressure distribution of the conditioned air in the underfloor chamber from the detected values of the temperature sensor and the pressure sensor, respectively, and conditioned air blown out from the plurality of outlets to the air-conditioned room according to the temperature distribution and the pressure distribution. Calculating means for calculating the amount of air blown by each of the blow means so that the heat quantity of the blow means becomes uniform; An air conditioning system comprising a control means for controlling an air flow. 2. The air conditioning system according to claim 1, wherein said blowing means are grouped according to a distance from said air supply port, and said blowing means is controlled by said control means for each group.