JP3052978B2 - 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, and more particularly to an air conditioning system for simultaneously air-conditioning a plurality of rooms in a house and using a VAV (variable air volume) unit.

[0002]

2. Description of the Related Art In an air conditioner of this type, an air supply heated or cooled to a certain temperature by an air conditioner is distributed to a plurality of chambers via an air supply duct, and is provided in association with each chamber. The temperature is individually controlled for each room by the VAV unit. As means for securing the outside air necessary for ventilation of each room, there are means (first means) for controlling the ratio of the outside air amount to the supply amount to be constant, and the outside air amount regardless of the supply amount. Means for controlling the air volume constant (second means), means for providing a CO ₂ sensor at the return air intake, and means for controlling the amount of outside air so that the CO ₂ concentration is within a certain range (third means) have been employed. .

[0003]

In the above-mentioned first means,
There is a problem that the required amount of outside air in the room cannot be secured because the air supply amount in the room with low cooling / heating load is small.
The second means has a problem in that energy is taken in more than necessary, which is against energy saving. The third means has a problem in that the cost is high because a CO ₂ sensor is used.

[0004] Therefore, a main object of the present invention is to provide an air-conditioning system that is inexpensive and can reliably secure an appropriate amount of outside air.

[0005]

SUMMARY OF THE INVENTION The present invention provides an air conditioner for heating or cooling at least outside air to a predetermined temperature and supplying it to each of a plurality of chambers, and a plurality of air conditioners provided in connection with each of the plurality of chambers. In the air conditioning system including a VAV unit that individually controls the amount of air supplied to each of the chambers, a damper that mixes external air with a required amount of return air from a plurality of chambers, and measures the amount of external air storing a wind sensor, the optimum amount of outside air preset for each of a plurality of chambers
And it should further comprising a storage unit, actually fixedly sets the sum of the optimum amount of fresh air in the conditioned the chamber as the target amount of fresh air,
An air conditioning system characterized in that an opening degree of a damper is controlled so that an outside air amount measured by a wind speed sensor becomes equal to a target outside air amount.

[0006]

[Function] The optimum outside air amount of the room to be actually air-conditioned is summed up.
The opening degree of the damper is controlled such that the actual outside air amount taken into the air conditioner is equal to the target outside air amount, which is the outside air amount. That is, the actual outside air amount is compared with the target outside air amount. If the actual outside air amount is small, the damper is operated in the closing direction, and if the actual outside air amount is large, the damper is operated in the opening direction.

[0007]

According to the present invention, an appropriate amount of outside air can be stabilized.
It can be secured reliably . Moreover, it is inexpensive because no CO2 sensor is used. The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0008]

FIG. 1 shows an air conditioning system 1 according to this embodiment.
0 is a plurality (five in this embodiment) of rooms 12a in the house
To 12e at the same time, and includes an air conditioner 16 controlled by the controller 14. The air conditioner 16 includes a casing 18. Casing 18
The partition wall 20 is formed in the inside of the inside, and the total heat exchanger 22 is provided in the partition wall 20. Thereby the casing 18
, A first chamber 24, a second chamber 26, a third chamber 28, and a fourth chamber 30 are formed. In addition, the partition wall 20 has the first
Damper 32 that opens and closes the chamber 24 and the second chamber 26
Is provided.

A return air port 34 is formed on the right side surface of the first chamber 24. Inside the first chamber 24, an air filter 36, a temperature sensor 38, a humidity sensor 40, and a return air fan 42 are provided from the upstream side. They are arranged in order. An air supply port 44 is formed on the right side surface of the second chamber 26, and an air supply fan 46, a cooling coil 48, and a heating coil 5 are provided inside the second chamber 26 from the upstream side.
0, a humidifier 52 and a temperature sensor 54 are arranged in this order. An outside air port 56 and an exhaust port 58 are formed on the left side surfaces of the third chamber 28 and the fourth chamber 30, respectively, and a wind speed sensor 60 and an air filter 62 are arranged inside the third chamber 28.

The cooling coil 4 is provided outside the casing 18.
8 and electric valves 64 and 66 for operating the heating coil 50, an electromagnetic valve 68 for operating the humidifier 52, and inverters 70 and 72 for controlling the rotation speeds of the return air fan 42 and the air supply fan 46. Then, the humidity sensor 40, the temperature sensors 38 and 54, and the wind speed sensor 60
Are connected to an AI (analog input) terminal 74 of the controller 14, the inverters 70 and 72, the electric valves 64 and 66, and the damper 32 are connected to an AO (analog output) terminal 76, and the electromagnetic valve 68 is
It is connected to an O (digital output) terminal 80, and the inverters 70 and 72 are further connected to a DI (digital input) terminal 78.

On the other hand, each room 12a to 12e in the house has
An air supply port 82 and a return air port 84 are formed, and the air supply port 82 and the air supply port 44 of the air conditioner 16 are communicated via an air supply duct 86, and the air return port 84 and the air return of the air conditioner 16 are returned. Breath 34
Are communicated with each other via an unillustrated ceiling space or the like. The air supply duct 86 is provided with a VAV (variable air volume) unit 92 including a damper 88 and a wind speed sensor 90 in association with each of the chambers 12a to 12e.
Has room thermos 9 provided in each of the rooms 12a to 12e.
4 are connected. As shown in FIG. 2, the room thermo 94 is provided with a start switch 96, a temperature setting switch 98, a temperature display unit 100, and the like. Each VAV unit 9
2 is the SI of the controller 14 via the operation panel 102
(Serial interface) Connected to terminal 104.

The controller 14 includes an MPU (microprocessor unit) (not shown) for performing various controls.
A ROM (not shown) is connected to the MPU, and the ROM stores design air volumes shown in Table 1 as a table.

[0013]

[Table 1]

A is the present invention, B is the prior art in which the ratio of the outside air amount to the supply air amount is constant, and C is the prior art in which the outside air amount is constant. In operation, the heating operation is selected by the operation panel 102, for example, the living room 12
a and the start switch 96 of the room thermo 94 in the dining room 12b is turned on (operation example 1 in Table 1).
Then, the electric valve 64 of the cooling coil 48 is closed, and the electric valve 66 of the heating coil 50 is opened. Also,
The electromagnetic valve 68 of the humidifier 52 is opened as required. Then, the return air fan 42 and the air supply fan 46 are driven at a predetermined rotation speed.

When the return air fan 42 and the supply air fan 46 are driven, the return air sent from the return air ports 84 of the living room 12a and the dining room 12b passes through the return air port 34 to the first air conditioner 16 of the air conditioner 16. It is taken into the chamber 24. The return air taken into the first chamber 24 is dust-removed through the air filter 36, a part of the air flows into the fourth chamber 30 through the total heat exchanger 22, and the rest flows into the second chamber 26 through the damper 32. I do. The return air flowing into the fourth chamber 30 is discharged outside through the exhaust port 58. Further, outside air from the outside is taken into the third chamber 28 through the outside air port 56, and after dust is removed through the air filter 62, the air flows into the second chamber 26 through the total heat exchanger 22, and returns into the second chamber 26 through the damper 32. Mixed with qi. At this time, the outside air amount measured by the wind velocity sensor 60 (Jitsugaiki weight) total air volume between the optimum amount of outside air 45 m ³ / hr optimum amount of outside air 95 m ³ / hr and dining room 12b living room 12a (target fresh air amount) The controller 14 is set to 140 m ³ / hr.
Thus, the opening of the damper 32 is controlled. That is, the actual outside air amount is compared with the target outside air amount. If the actual outside air amount is small, the damper 32 is operated in the closing direction, and if the actual outside air amount is large, the damper 32 is operated in the opening direction.

The mixture of the outside air and the return air is heated to a predetermined temperature through a heating coil 50, humidified as necessary through a humidifier 52, and then through a supply port 44 through a supply duct 86 to the living room 12a and the dining room. Room 1
2b. The amount of air supplied to the living room 12a and the dining room 12b is adjusted by each VAV unit 92.
375m ³ / hr to 2a, 1 to dining room 12b
75 m ³ / hr is supplied. Therefore, the ratio of the outside air to the supply air is about 25.5%, and the living room 12a
And 95.5 each in the dining room 12b
m ³ / hr and 44.5 m ³ / hr of outside air will be supplied.

In the prior art B (Table 1) in which the ratio of the outside air amount to the air supply amount is constant (20%), the air supply amount of the living room 12a and the dining room 12b is 3
When the air volume is 75 m ³ / hr and 175 m ³ / hr, the outside air amounts are 75 m ³ / hr and 35 m ³ / hr. Further, in the prior art C (Table 1) in which the outside air amount is constant (240 m ³ / hr), when the supply air amounts of the living room 12a and the dining room 12b are 375 m ³ / hr and 175 m ³ / hr,
The outside air amounts are 164 m ³ / hr and 76 m ³ / hr.

In the heating operation, the dining room 12b, the Japanese-style room 12c and the children's room 12d are air-conditioned (operation example 2 in Table 1), and the children's room 12d and the bedroom 12
When e is air-conditioned (Operating Example 3 in Table 1), similarly to Operating Example 1, the amount of outside air taken in from the outside air port 56 is equal to the total air volume of the optimal outside air amount of each room to be air-conditioned. The opening of the damper 32 is controlled by the controller 14 so as to be equal.

Similarly, when the cooling operation is selected by the operation panel 102, the total air volume of the optimum external air volume of each room to be air-conditioned can be taken in from the external air port 56. According to this embodiment, since the total air volume of the optimum outside air amount of each room to be air-conditioned is taken in from the outside air port 56, as can be clearly understood from Table 1, the outside air amount close to the preset optimum outside air amount is obtained. Can be supplied to each room. Therefore, there is no problem that the amount of outside air is insufficient and the indoor air-conditioning environment is deteriorated unlike the conventional technology B. Further, unlike the related art C, there is no problem that the outside air is taken in more than necessary and the air-conditioning load increases, and the operation cost increases.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing one embodiment of the present invention;

FIG. 2 is an illustrative view showing a room thermo used in the embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Air conditioning system 12a-12e ... Room 14 ... Controller 16 ... Air conditioner 18 ... Casing 32 ... Damper 42 ... Return air fan 46 ... Supply air fan 48 ... Cooling coil 50 ... Heating coil 52 ... Humidifier 54 ... Temperature sensor 56 ... outside air opening 60 ... wind speed sensor 86 ... air supply duct 92 ... VAV unit 94 ... room thermo 102 ... operation panel

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Isamu Tanabe 5-1-1, Mamiminami, Koryo-cho, Kitakatsuragi-gun, Nara Pref. (56) References JP-A-2-290454 (JP, A) JP-A-3-236540 (JP, A) JP-A-5-164381 (JP, A) (58) Fields surveyed (Int .Cl. ⁷ , DB name) F24F 11/02 102

Claims (1)

(57) [Claims] 1. An air conditioner for heating or cooling at least outside air to a predetermined temperature and supplying it to each of a plurality of chambers, and an air conditioner provided in association with each of the plurality of chambers and supplying to each of the plurality of chambers An air conditioning system comprising a VAV unit for individually controlling the amount of supplied air, a damper for mixing the required amount of return air from the plurality of chambers with the outside air, and a wind speed sensor for measuring the amount of the outside air. , serial optimum fresh air amount set in advance for each of said plurality of chambers
Anda storing means for憶, actually the sum of the optimum amount of fresh air in the conditioned the chamber fixedly as the target fresh air amount
An air conditioning system, wherein the damper is set and the opening of the damper is controlled so that the outside air amount measured by the wind speed sensor is equal to a target outside air amount.