JP3013964B2 - Underfloor 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 underfloor air-conditioning system, and more particularly to an underfloor air-conditioning system for air-conditioning an air-conditioned room having a biased heat load by a heating element such as OA equipment.

[0002]

2. Description of the Related Art In recent years, office buildings and the like have become more sophisticated and the installation density of office automation equipment and the like has increased. For this reason, a member such as a free access floor is used as a space for wiring power cables of OA equipment and the like and a communication cable such as a local area network (LAN). 2. Description of the Related Art An underfloor air-conditioning system has been practiced in which conditioned air supplied to an underfloor chamber from an air conditioner is blown into an air-conditioning room from a plurality of outlets formed on a floor surface.

[0003] This underfloor air conditioning system is shown in FIG.
As shown in FIG. 1, the conditioned air whose temperature has been adjusted by the heater 1A and the cooler 1B of the air conditioner 1 is supplied to the underfloor chamber 3 through the air supply duct 2 by the blower 1C, and is formed on the floor surface 4. Are blown out to the air conditioning room 7 from the plurality of outlets 5, 5,. The air-conditioned air blown out to the air-conditioning room 7 is sucked into the ceiling chamber 10 by a plurality of suction devices 9 provided on the ceiling 8 of the air-conditioning room 7 and is returned to the air conditioner 1 through the return air duct 11.
Return to the circulation.

The blower outlets 5 are provided with blowers 6 of a fan unit type or a damper type using a uniform underfloor chamber, respectively, and are blown out from each blower outlet 5 into the air-conditioning chamber 7 with a uniform blown air volume. You. Further, the air-conditioning room 7 is provided with a temperature sensor 12 for detecting a representative temperature of the air-conditioning room 7, and the detected temperature of the temperature sensor 12 is input to the controller 13. The temperature control device 14 controls the amount of cold and hot water in the heater 1A and the cooler 1B of the air conditioner 1, and the blower control device 15 determines the amount of air supplied to the underfloor chamber 3 from the blower 1C. Had control. As a result, the amount of air blown out from each air outlet 5 is not varied, and the representative temperature of the air conditioning room 7 is maintained at the set temperature.

[0005]

However, in the air-conditioning room 7 in which the OA equipment 16 is installed like an office of an office building, the heat load of the entire air-conditioning room 7 is not uniform, and the heat generated by the OA equipment 16 and the like is not uniform. Unevenness occurs due to the heat generated from the equipment. Further, the heat load in the perimeter zone near the window (not shown) of the air-conditioning room 7 is greatly affected by the influence of the solar heat, and the influence of the solar heat differs depending on the direction of the window, the weather, the time of day, and the like. .

However, in the case of the conventional underfloor air conditioning system, it is good if the heat load of the entire air conditioning room 7 is uniform, but if the heat load is uneven, each outlet 5
However, there is a drawback in that even if the variation in the amount of air blown from the air is eliminated, or even if the representative temperature of the air-conditioning room 7 is kept constant, appropriate air-conditioning cannot be performed according to the unevenness of the heat load. As a result, there is a problem that temperature unevenness occurs in the air conditioning room 7 and a comfortable space cannot be formed in the entire air conditioning room 7.
In addition, since the conditioned air is uniformly blown out of each of the air outlets 5 irrespective of the unevenness of the heat load of the air conditioning room 7, the air conditioning becomes inefficient and there is a problem in terms of energy saving.

[0007] The present invention has been made in view of such circumstances, and an underfloor air-conditioning system capable of accurately air-conditioning individually according to the unevenness of the heat load of an air-conditioning room and reducing the total air flow of the air conditioner. The purpose is to provide.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides an air-conditioning system in which air-conditioned air supplied from an air conditioner into an underfloor chamber is air-conditioned from a plurality of outlets formed on the floor of the air-conditioned room. In the underfloor air-conditioning system that blows out to the room,
Along with each blower that can adjust the amount of blown air at each of the outlets, the blowers are grouped into a plurality of adjacent groups, and the air conditioning room is zoned into a plurality of air conditioning zones corresponding to the groups, Each of the zoned air-conditioning zones is provided with a temperature sensor for detecting a heat load of each air-conditioning zone, and an amount of air blown from each blower is adjusted for each group so that the temperature detected by each temperature sensor becomes a preset temperature. An air flow control means for controlling the air flow, and a differential pressure gauge for detecting a differential pressure between the air-conditioning room and the underfloor chamber, wherein the air-conditioner is controlled such that a differential pressure detected by the differential pressure gauge is maintained at a preset differential pressure. And an air supply amount control means for controlling an air supply amount supplied to the inside of the underfloor chamber.

[0009]

According to the present invention, blowers capable of adjusting the amount of blown air are provided at a plurality of blowout ports formed on the floor of an air conditioning room, and each blower is grouped into a plurality of adjacent groups. The air-conditioning room is zoned into a plurality of air-conditioning zones corresponding to the above, and each of the zoned air-conditioning zones is provided with a temperature sensor for detecting a heat load of each air-conditioning zone. Then, the blow-out air amount control means controls the blow-out air amount of each blower for each group so that the detection result of each temperature sensor becomes a preset temperature. As a result, the air conditioning room can be individually air-conditioned for each air conditioning zone according to the heat load of each air conditioning zone. Therefore, even if the heat load of each air conditioning zone is uneven, appropriate air conditioning according to the uneven heat load can be achieved. It can be performed. Also, by performing individual air conditioning, the amount of air supplied to the underfloor chamber from the air conditioner is reduced, thereby saving energy. In addition, since the blowers are collectively controlled for each group, the control system can be simplified as compared with a case where the blowers are individually controlled.

In order to accurately control the amount of air blown from the blower, a differential pressure gauge for detecting a differential pressure between the air-conditioning room and the underfloor chamber is provided, and the differential pressure detected by the differential pressure gauge is set to a preset differential pressure. The amount of air supplied to the underfloor chamber from the air conditioner is controlled by the second control means so as to be maintained. As a result, the air conditioning room can be individually and accurately air-conditioned for each air conditioning zone in accordance with the heat load of each air conditioning zone. Air conditioning can be performed. Also,
By performing accurate individual air conditioning, the amount of air supplied to the underfloor chamber from the air conditioner is reduced, thereby saving energy. In addition, since the blowers are collectively controlled for each group, the control system can be simplified as compared with a case where the blowers are individually controlled.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the 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 under a floor 22 of the air conditioning room 20, and a plurality of air outlets 26 are provided on the surface of the floor 22.
26 are formed. Further, a ceiling chamber 30 is provided behind the ceiling 28 of the air conditioning room 20, and a plurality of suction devices 32, 32... For sucking return air from the air conditioning room 20 into the ceiling chamber 30 are provided on the surface of the ceiling 28. I have. An air conditioner 36 including a heater 36A, a cooler 36B, and a blower 36C is provided in the machine room 34 adjacent to the air conditioning room 20. The conditioned air from the air conditioner 36 is supplied to the air supply duct 3
The air is supplied to the underfloor chamber 24 through the
From the air conditioning room 20, and the return air in the air conditioning room 20 returns to the air conditioner 36 via the return air duct 40 to form a circulation path.

The plurality of outlets 26 are provided with blowers 42, 42,... Capable of adjusting the amount of blown air, and each blower 42 is provided with a plurality of adjacent groups, for example, three groups shown in FIG. A, B, and C are grouped. As the blower 42, a fan unit system that adjusts the amount of blown air according to the number of rotations of the fan or a damper system that adjusts the amount of blown air according to the opening of the electric shutter is used. In addition, the air-conditioning room 20 has a plurality of air-conditioning zones a,
are air-conditioned zones a, b, and c, and temperature sensors 43, 43,. The temperature detected by each of the temperature sensors 43 is calculated by a blower computing unit 44 provided for each group.
44,... Are sequentially input. In the blower computing unit 44,
The detected temperature is compared with a set temperature previously input to the blower calculator 44, and the fan rotation speed or the electric shutter opening of the blower 42 is determined so that the detected temperature becomes the set temperature. A signal is output to the blower control device 46 provided in the controller. In each blower control device 46,
Based on the output signal from the blower computing unit 44, the blowout air volume of each blower 42 of the corresponding group is collectively controlled.

The temperature control of the conditioned air by the heater 36A and the cooler 36B of the air conditioner 36 is performed by outputting a set temperature signal set in the blower calculator 44 to a temperature control controller 48, Control device 48 is heater 3
The adjustment is performed by adjusting solenoid valves of cold and hot water pipes (not shown) of 6A and the cooler 36B. On the other hand, a control system for controlling the amount of air supplied from an air blower 36C for supplying air from the air conditioner 36 to the underfloor chamber 24 includes a control system for controlling the amount of air blown from the blower 42, a heater 36A for controlling the air-conditioning temperature, and a cooling device 36A. It is formed independently of the control system of the vessel 36B.
That is, in the underfloor chamber 24, a differential pressure gauge 50 for detecting a differential pressure between the air conditioning room 20 and the underfloor chamber 24 is provided,
The differential pressure detected by the differential pressure gauge 50 is calculated by the arithmetic unit 5 for the blower.
2 is input. In the blower computing unit 52, the detected differential pressure is compared with a set differential pressure previously input to the blower computing unit 52, and the fan rotation of the blower 36C is maintained so that the detected differential pressure is maintained at the set differential pressure. The number is determined, and a signal is output to the blower control device 54. In the blower control device 54,
The blower 3 based on the output signal from the blower computing unit 52
The air supply amount of 6C is controlled.

Next, the operation of the underfloor air-conditioning system of the present invention configured as described above will be described. The conditioned air whose temperature has been adjusted to the set temperature by the heater 36A and the cooler 36B of the air conditioner 36 is supplied to the underfloor chamber 24 via the supply duct 38. And the underfloor chamber 2
The air-conditioned air supplied to 4 is blown out to the air-conditioned room 20 with the blow-off air volume controlled as follows. That is, the temperature detected by the temperature sensor 43 provided in each of the air conditioning zones a, b, and c of the air conditioning room 20 is sequentially input to each blower computing unit 44. The detected temperature input to each blower calculator 44 is compared with a set temperature previously input to blower calculator 44, and the amount of air blown from blower 42 is determined so that the detected temperature becomes the set temperature. Is done. The determined result is the blower controller 4 provided for each of the groups A, B, and C.
6 and each blower controller 46 collectively controls the amount of air blown from the blowers 42 of the corresponding group.

Thus, the air-conditioning room 20 is set in the air-conditioning zone a,
Individual air conditioning can be performed for each of b and c. That is, in an air-conditioning zone (for example, c) having a large heat load due to heat from a heating element such as an OA device (not shown), a large air volume corresponding to the heat load is output from each blower 42 of the group C corresponding to the air-conditioning zone c. A small air volume corresponding to the heat load is blown out from the blower 42 of the corresponding group A to the air-conditioning zone (for example, a) where the heat load is small. Therefore, even if the heat loads of the air conditioning zones a, b, and c of the air conditioning room are uneven, appropriate air conditioning can be performed according to the uneven heat load.
Comfort can be improved. Further, even in the case of the perimeter zone of the air-conditioning room 20 in which the heat load greatly changes depending on the amount of solar radiation, air conditioning can be performed according to the change in the heat load, so that the comfort of the perimeter zone can be improved.

In addition, by adjusting the amount of air blown from the blowers 42 of the corresponding groups A, B, and C in accordance with the bias of the heat load of each of the air conditioning zones a, b, and c, the air conditioner 36 can be moved from the underfloor to the underfloor. Since the total amount of air supplied to the chamber 24 can be reduced and efficient air conditioning can be performed, energy is saved compared to a conventional underfloor air conditioning system in which the amount of air blown out from all blowers is made uniform.

Further, since the blowers 42 are collectively controlled for each of the groups A, B and C, the control system can be simplified as compared with the case where the blowers 42 are individually controlled. Further, in the underfloor air-conditioning system of the present invention, in order to accurately control the amount of conditioned air blown from the underfloor chamber 24 to the air-conditioning room 20, the air supply of the blower 36C for supplying air from the air conditioner 36 to the underfloor chamber 24 is performed. The air volume was controlled as follows. That is, the differential pressure between the inside of the air-conditioning room 20 and the inside of the underfloor chamber 24 is detected by the differential pressure gauge 50 and is sequentially input to the blower computing unit 52. Arithmetic unit 5 for blower
2, the detected differential pressure is compared with a set differential pressure previously input to the blower computing unit 52, and the supply air volume of the blower 36C is adjusted so that the detected differential pressure is maintained at the set differential pressure. It is determined. The determined result is input to the blower control device 54, and the blower control device 54 controls the amount of air supplied to the blower 36C. Thereby, even if the amount of air blown from the blower 42 changes according to the change in the heat load of each of the air conditioning zones a, b, and c, the amount of air blown out from the underfloor chamber 24 to the air conditioning room 20 and the amount of air blown from the air conditioner 36 Since the balance with the amount of air supplied to the underfloor chamber 24 is appropriately maintained, the amount of air blown from the blower 42 can be accurately controlled.

As in the underfloor air-conditioning system of the present invention, there is no control system for the amount of air supplied from the air conditioner 36 to the underfloor chamber 24. The following problems occur when air is supplied. For example, the group A of the blower 42,
When the conditioned air is blown only from the blower 42 of the group A of B and C to the air conditioning room 20 and the blowout of the blower 42 of the group B and C is stopped, the amount of blown air blown out from the underfloor chamber 24 to the air conditioning room 20. The amount of air supplied from the blower 36C to the underfloor chamber 24 is larger than that, and the pressure in the underfloor chamber 24 increases. As a result,
A back pressure is applied to the blowers 42 of the group A, and the amount of air blown out of the blowers 42 is blown out to the air conditioning room 20 by the back pressure.

Therefore, since the amount of air blown from the blower 42 cannot be controlled with high accuracy, the temperature of the air-conditioned room 20 cannot be maintained at the set temperature, and the comfort of the air-conditioned room 20 is hindered. The comfort of the air conditioning room 20 cannot be improved. In addition, the blowers 42 of the groups B and C
In this case as well, since the pressure in the underfloor chamber 24 increases, the conditioned air in the underfloor chamber 24 leaks into the air conditioning room 20, so that wasteful conditioned air is consumed, and the energy saving which is the object of the present invention is achieved. become unable.

In this embodiment, each air conditioning zone a, b,
c, the amount of air blown from each of the blowers 42 of the corresponding groups A, B, and C is controlled based on the temperature detected by the temperature sensor 43 provided in the temperature sensor 43.
The F switch and the blowout air volume of each blower 42 group corresponding to the air conditioning zone having the OA equipment may be linked. For example, when the switch of the OA equipment is turned on, the fan of the fan unit type blower 42 is set to the maximum number of revolutions, or the damper type blower 42
Is fully opened. When the switch of the OA device is turned off, the blower 4 of the fan unit type is turned off.
The second fan is stopped, or the opening of the damper type blower is fully closed.

[0021]

As described above, according to the underfloor air conditioning system according to the present invention, the supply air volume control means for controlling the differential pressure between the air conditioning room and the underfloor chamber to be maintained at the set value is provided. Therefore, even if the amount of air blown from the blower changes according to the heat load of each air conditioning zone of the air conditioning room, the amount of air blown from the underfloor chamber to the air conditioning room and the amount of air supplied from the air conditioner to the underfloor chamber The balance with the air volume is appropriately maintained, and the air volume blown out from the blower can be accurately controlled. In addition, since individual air conditioning can be accurately performed for each air conditioning zone according to the heat load of the air conditioning zone of the air conditioning room, a heating element such as an OA device is operated, and an air conditioning zone having a large heat load is provided in the air conditioning zone. Each blower of the corresponding group blows out a large amount of air corresponding to the heat load, and can blow out a small amount of air to the air conditioning zone where the heat load is small. Therefore, even if the heat load of each air conditioning zone of the air conditioning room is uneven, appropriate air conditioning can be performed according to the uneven heat load, so that comfort can be improved.
In addition, even in the case of a perimeter zone in which the heat load greatly changes depending on the amount of solar radiation, air conditioning can be performed according to the change in the heat load, so that the comfort of the perimeter zone can be improved.

Further, it is possible to perform efficient air conditioning by adjusting the amount of air blown out from the blowers of each group in accordance with the unevenness of the heat load in the air conditioning zone. Therefore, as compared with the conventional underfloor air conditioning system in which the amount of air blown from all the blowers is made uniform, the total amount of air supplied from the air conditioner to the underfloor chamber can be reduced, thereby saving energy. Also,
Since the blowers are controlled collectively for each group,
The control system can be simplified as compared with the case where the blowers are individually controlled.

[Brief description of the drawings]

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

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

[Explanation of symbols]

 Reference Signs List 20 air conditioning room 22 floor 24 underfloor chamber 26 outlet 28 ceiling 30 ceiling chamber 32 intake device 36 air conditioner 36A air conditioner heater 36B air conditioner cooler 36C air conditioner air blower Device 42: blower 44: calculator for blower 46: controller for blower 50 ... differential pressure gauge 52: calculator for blower 54: controller for blower

Continued on the front page (72) Inventor Toshito Takenami 1-1-1 Uchikanda, Chiyoda-ku, Tokyo Inside Hitachi Plant Construction Co., Ltd. (72) Inventor Yoshihiro Kimoto 1-11-1 Uchikanda, Chiyoda-ku, Tokyo Hitachi Plant Construction Co., Ltd. (72) Inventor Toshio Onodera 1-11-1 Uchikanda, Chiyoda-ku, Tokyo Hitachi Plant Construction Co., Ltd. (72) Inventor Terumi Sahara 2880 Kokuzu, Odawara City, Kanagawa Prefecture Hitachi, Ltd. Odawara Plant (56) References JP-A-5-164393 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 3/00 F24F 11/053 F24F 13/068

Claims (1)

(57) [Claims] 1. An underfloor air-conditioning system for blowing conditioned air supplied from an air conditioner into an underfloor chamber through a plurality of outlets formed on a floor surface of an air-conditioning room to the air-conditioning room. In addition to providing blowers each capable of adjusting the amount of blown air, the blowers are grouped into a plurality of adjacent groups, and the air-conditioning rooms are zoned into a plurality of air-conditioning zones corresponding to the groups. A temperature sensor for detecting the heat load of each air conditioning zone is provided in each of the air conditioning zones, and an air volume control for controlling the air volume of each air blower for each group so that the detected temperature of each temperature sensor becomes a preset temperature. means is provided, a differential pressure gauge for detecting the differential pressure of the air-conditioned room with underfloor chamber
The differential pressure detected by this differential pressure gauge is maintained at a preset differential pressure.
Supply air from the air conditioner into the underfloor chamber
An underfloor air-conditioning system comprising a supply air volume control means for controlling an air volume .