JP3143020B2 - 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 which individually air-conditions a room, for example, divided into a plurality of zones and having a predetermined required ventilation volume.

[0002]

2. Description of the Related Art An example of a conventional air conditioning system is disclosed, for example, in Japanese Patent Application No. 2-339050. In this prior art, in order to secure an air supply amount required for ventilation, a minimum air volume unique to each VAV unit is set as shown in the graph of FIG.

[0003]

In the prior art, each V
The specific minimum air volume set for the AV unit is generally a large value of about 30 to 60% of the maximum air volume, and there is a problem that the control range for the fluctuation of the air conditioning load is narrow. Therefore, when cooling (when heating)
However, even when the room temperature is sufficiently low (high) and the VAV unit is operated with the minimum air volume, there is a risk that the large air volume may cause an uncomfortable state of being too cold (too warm).

[0004] Therefore, a main object of the present invention is to provide an air-conditioning system capable of expanding a control range with respect to a change in an air conditioning load.

[0005]

SUMMARY OF THE INVENTION The present invention provides an air conditioner for heating or cooling at least outside air and supplying it to a room divided into a plurality of zones, and detecting the temperature of each of the plurality of zones. Temperature detecting means, required temperature setting means for setting a required temperature for each of the plurality of zones, a plurality of temperature detection means, based on the temperature detected by the temperature detecting means and the required temperature set by the required temperature setting means A required air volume calculating means for calculating the required air volume required in each of the zones, and when the total required air volume is smaller than the minimum required air volume required for the entire room, the required air volume is proportionally divided by the required air volume ratio. The target air volume to be supplied to each of the plurality of zones, and a target air volume setting means for setting the required air volume to the target air volume as it is when the total required air volume is equal to or more than the required air supply volume. It is a harmonious system.

[0006]

The required air volume required in each of a plurality of zones is calculated based on the room temperature detected by the temperature detecting means and the required temperature set by the required temperature setting means, and the total of the calculated required air volumes is calculated for the entire room. When the required air supply amount is exceeded, the required air volume is supplied to each zone. On the other hand, when the total of the calculated required air volumes is smaller than the required air supply amount of the entire room, an air volume obtained by proportionally dividing the required air supply volume by the required air volume ratio is supplied to each zone. Therefore, an air supply amount necessary for ventilation and the like can be always secured for the entire room.

[0007]

According to the present invention, the air supply required for ventilation and the like can be secured for the entire room, so that the minimum air volume of each VAV unit can be set to "0", for example, and the air conditioning load of each zone can be reduced. The control range for fluctuation can be greatly expanded. 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]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, an air conditioning system 10 of this embodiment includes three zones 14 in a room 12 to be air-conditioned.
Are simultaneously air-conditioned.
And an air conditioner 18 controlled by the air conditioner. However, two or more zones 14 may be provided, and the number is not limited to the embodiment.

The air conditioner 18 includes a casing 20.
An air supply port 22 is formed on the right side of the casing 20, and an air intake 24 is formed on the left side of the casing 20. The air filter 26 and the heat exchange coil 2 are provided inside the casing 20.
8 and an air supply fan 30 are arranged in this order from the upstream side, and an electric valve 32 for operating the heat exchange coil 28 and an inverter 34 for controlling the rotation speed of the air supply fan 30 are provided outside the casing 20. Are provided.

On the other hand, an air supply port 36 and a return air port 37 are formed in the room 12, and the air supply port 36 and the air supply port 22 of the air conditioner 18 are communicated via an air supply duct 38. ,
The return air port 37 communicates with the air inlet 24 of the air conditioner 18 and an exhaust port (not shown) via a space above the ceiling (not shown). Each air supply duct 38 has a zone 14
In connection with, V including the damper 40 and the wind speed sensor 42
An AV (variable air volume) unit 44 is provided, and a room thermo 46 provided in each zone 14 is connected to each VAV unit 44. The room thermo 46 is provided with a temperature detector and a temperature setting device 56 (not shown). Furthermore, a temperature sensor 48 for measuring the temperature of the air supplied from the air conditioner 18 to the room 12 is provided at the inlet of the air supply duct 38.

The electric valve 32 of the air conditioner 18
And an inverter 34 are connected to an AO (analog output) terminal 50 of the controller 16 and the temperature sensor 4
8 is connected to an AI (analog input) terminal 52,
Each VAV unit 44 is connected to an SIO (serial input / output) terminal 54. In the related art, as shown in FIG. 4, a unique minimum air volume is set for each VAV unit 44.
Is set to "0" as shown in FIG.

When a power switch (not shown) of the air conditioning system 10 is turned on and a required temperature is set by a temperature setter 56 provided in each room thermo 46, an air volume setting operation as shown in a flow chart of FIG. 3 is executed. You. That is, first, in step S1, the air volumes (hereinafter, referred to as "required air volumes") Q1, Q2, and Q3 required in each zone 14 are obtained, and the total air volume A thereof is obtained. The required air volume Q1, Q2 and Q3 of each zone 14 is
It is determined based on the temperature difference between the room temperature detected by each room thermo 46 and the set temperature.

In step S3, it is determined whether or not the total air volume A is equal to or more than the minimum air volume of the air conditioner 18, that is, an air supply amount (hereinafter, referred to as a "necessary air supply amount") Q which is minimum necessary for ventilation of the entire room 12. Is determined. In step S3, "Y
If "ES" is determined, the process proceeds to step S5, where the required air volumes Q1, Q2, and Q3 of each zone 14 are to be supplied to each zone 14 as they are (hereinafter, referred to as "target air volume").
They are set as Q1 ', Q2' and Q3 '. on the other hand,
If "NO" is determined in the step S3, the process proceeds to a step S7, and the target air volumes Q1 ', Q2' and Q3 'of each zone 14 are set so that the total air volume A becomes equal to the required air supply volume Q. . In other words, the air volumes obtained by proportionally dividing the required air supply volume Q by the ratio of the required air volumes Q1, Q2 and Q3 are set as the target air volumes Q1 ', Q2' and Q3 'of each zone 14. Then, these values are stored in each VAV unit 44.
Is written to. In this manner, each VAV unit 4 is controlled so that the total air volume A does not become smaller than the required air supply volume Q.
4 is controlled.

When the cooling operation is selected by an operation panel (not shown), the electric valve 32 of the heat exchange coil 28 is opened, and the air supply fan 30 is driven at a predetermined rotation speed. Then, a part of the return air sent from each return air port 37 of the room 12 is sucked into the casing 20 from the air inlet 24 of the air conditioner 18 together with the outside air taken in from the outside, and is removed through the air filter 26. After that, it is cooled through the heat exchange coil 28. And
The dust-removed and cooled air is supplied to the air supply fan 30, the air supply duct 3
8. It is supplied to each zone 14 of the room 12 through each VAV unit 44. Similarly, when the heating operation is selected by an operation panel (not shown), the dust-removed and heated air is supplied to each zone 14 through the air supply fan 30, the air supply duct 38, and the VAV units 44. In addition, only the outside air may be sucked from the air inlet 24 of the air conditioner 18 as needed.

According to this embodiment, each VAV unit 1
4 is set to “0” and the required air supply amount Q is secured in the entire room 12, so that the control range for the fluctuation of the air conditioning load in each zone can be expanded. For example, even if the required air volume of a certain zone 14 is “0”, the required air volume Q can be secured if the sum of the required air volumes of the other two zones 14 is equal to or more than the required air volume Q. Therefore, in this case, the air supply to the zone that does not need to be air-conditioned in the related art can be diverted to the other two zones, so that the air-conditioning can be more efficiently performed as a whole.

In the above embodiment, the case where only one room 12 is to be air-conditioned has been described. However, the present invention can be applied to a case where there are two or more rooms 12 to be air-conditioned.
The same application can be made by setting the required supply amount Q every time.

[Brief description of the drawings]

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

FIG. 2 is a graph showing control characteristics of the VAV unit in the embodiment of FIG.

FIG. 3 is a flowchart showing the operation of the embodiment in FIG. 1;

FIG. 4 is a graph showing control characteristics of a VAV unit according to the related art.

[Explanation of symbols]

 10 ... air conditioning system 12 ... room 14 ... zone 16 ... controller 18 ... air conditioner 44 ... VAV unit 46 ... room thermo

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 11/053

Claims (1)

(57) [Claims] 1. An air conditioner for heating or cooling at least outside air and supplying it to a room divided into a plurality of zones, temperature detecting means for detecting a temperature of each of the plurality of zones, Required temperature setting means for setting a required temperature for each of the zones, the plurality of zones based on the temperature detected by the temperature detecting means and the required temperature set by the required temperature setting means. A required air volume calculation means for calculating a required air volume required in each of the above, and when the total of the required air volumes is smaller than the minimum required air volume required for the entire room, the required air volume is calculated as the required air volume. The air volume proportionally divided by the ratio is set as a target air volume to be supplied to each of the plurality of zones, and when the total of the required air volumes is equal to or greater than the required air supply volume, the required air volume is directly used as the target air volume. It comprises a target air amount setting means for the amount, the air conditioning system.