JPH0861757A - Air conditioning device - Google Patents

Abstract

PURPOSE: To increase control range for fluctuations in air conditioning loads by a method wherein, when the total of required air amounts is smaller than necessary air supply amount, the air amount obtained by the proportional distribution of the necessary air supply amount in the ratio of the required air amounts is made the target amount of air to be supplied to each of a plurality of zones. CONSTITUTION: When the required temperature is set by a temperature setting device 56 provided in each room thermostat 46, the air amounts Q1, Q2 and Q3 required of each zone 14 are obtained together with the total air amount. When the total air amount is equal to at least the minimum air supply amount of an air conditioner 18, i.e., the minimum necessary for entirely ventilating the air in a room 12, the air amounts Q1, Q2 and Q3 required of each zone 14 are as such set as the air amounts (target air amount) to be supplied to each zone 14. When the total air amount is less than the minimum necessary therefor, in order to make the total air amount equal to the necessary air amount, the air amount obtained by the propertional distribution of the necessary air supply amount in the Q1:Q2:Q3 ratio is set as the target air amount of each zone 14.

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 individually air-conditioning a room which is divided into a plurality of zones and whose total required ventilation is fixed.

[0002]

2. Description of the Related Art An example of a conventional air conditioning system is disclosed in, for example, Japanese Patent Application No. 2-339050. In this conventional technique, in order to secure the amount of air supply 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 peculiar minimum air volume set in the AV unit is generally a large value of about 30 to 60% with respect to the maximum air volume, and there is a problem that the control range for the fluctuation of the air conditioning load is narrow. Therefore, during cooling (when heating)
Even when the room temperature is sufficiently low (high) and the VAV unit is operated at the minimum air volume, there is a fear that the air volume is large and the air condition becomes too cold (too warm).

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

[0005]

According to the present invention, there is provided an air conditioner for heating or cooling at least outside air to supply it to a room divided into a plurality of zones, and to detect the temperature of each of the plurality of zones. Temperature detecting means, a required temperature setting means for setting a required temperature for each of the plurality of zones, a plurality of temperature based on the temperature detected by the temperature detecting means and the required temperature set by the required temperature setting means. Required air flow rate calculation means for calculating the required air flow rate for each zone, and when the total required air flow rate is smaller than the minimum required air supply rate for the entire room, the required air supply rate is proportionally divided by the required air flow rate. The target air volume to be supplied to each of the plurality of zones, the target air volume setting means for directly setting the required air volume to the target air volume 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 the plurality of zones is calculated on the basis of 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 flow amount is supplied to each zone. On the other hand, when the calculated total required air volume is smaller than the required air supply amount for the entire room, the required air supply amount is proportionally divided by the required air flow rate, and the air amount is supplied to each zone. Therefore, the air supply amount necessary for ventilation and the like can be always secured in the entire room.

[0007]

According to the present invention, since the air supply amount necessary for ventilation or the like can be secured in the entire room, the minimum air flow rate of each VAV unit can be set to, for example, "0", and the air conditioning load of each zone can be reduced. The control range for fluctuations can be greatly expanded. The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, an air conditioning system 10 of this embodiment has three zones 14 in a room 12 to be conditioned.
And the controller 16
An air conditioner 18 controlled by However, it suffices that two or more zones 14 are provided, and the number thereof 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 surface of the casing 20, and an air intake port 24 is formed on the left side surface. Inside the casing 20, the air filter 26 and the heat exchange coil 2 are provided.
8 and the 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. Etc. are provided.

On the other hand, an air supply port 36 and a return air port 37 are formed in the room 12, the air supply port 36 and the air supply port 22 of the air conditioner 18 communicate with each other through an air supply duct 38, and ,
The return air port 37 is communicated with the air intake port 24 of the air conditioner 18 and the exhaust port (not shown) via a ceiling space (not shown) or the like. Then, in the air supply duct 38, each zone 14
Related to V including a damper 40 and a wind speed sensor 42
An AV (variable air volume) unit 44 is provided, and a room thermostat 46 provided in each zone 14 is connected to each VAV unit 44. The room thermostat 46 is provided with a temperature detector and a temperature setter 56 (not shown). Further, at the entrance of the air supply duct 38, a temperature sensor 48 for measuring the temperature of the air supply supplied from the air conditioner 18 to the room 12 is provided.

The electric valve 32 of the air conditioner 18
And the inverter 34 are connected to the AO (analog output) terminal 50 of the controller 16, and the temperature sensor 4
8 is connected to the AI (analog input) terminal 52,
Each VAV unit 44 is connected to the SIO (serial input / output) terminal 54. Note that, in the past, as shown in FIG. 4, a specific minimum air volume was set for each VAV unit 44, but each VAV unit 44 in this embodiment is set.
The minimum air volume of is set to "0" as shown in FIG.

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

In step S3, it is determined whether the total air volume A is equal to or more than the minimum air volume of the air conditioner 18, that is, the minimum air supply amount required for ventilation of the entire room 12 (hereinafter referred to as "required air supply amount") Q. Is determined. In step S3, "Y
If it is judged as "ES", the flow proceeds to step S5, and the required air volumes Q1, Q2 and Q3 of each zone 14 should be supplied to each zone 14 as they are (hereinafter referred to as "target air volume").
It is set as Q1 ', Q2' and Q3 '. on the other hand,
If "NO" is determined in step S3, the process proceeds to step S7, and 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. . That is, the necessary air supply amount Q is proportionally divided by the ratio of the required air amounts Q1, Q2 and Q3, and the air amounts are set as the target air amounts Q1 ', Q2' and Q3 'of each zone 14. Then, these values are used for each VAV unit 44.
Is written to. In this way, each VAV unit 4 is prevented 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 the 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 intake port 24 of the air conditioner 18 together with the outside air taken in from the outside, and dust 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 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 the operation panel (not shown), the dust / heated air is supplied to each zone 14 through the air supply fan 30, the air supply duct 38, and each VAV unit 44. Note that only the outside air may be sucked from the air intake port 24 of the air conditioner 18 if necessary.

According to this embodiment, each VAV unit 1
Since the minimum air flow rate of No. 4 is set to "0" and the required air supply amount Q is secured in the entire room 12, the control range with respect to the fluctuation of the air conditioning load in each zone can be expanded. For example, even if the required air flow rate of a certain zone 14 is "0", the required air supply rate Q can be secured if the total of the required air flow rates of the other two zones 14 is equal to or greater than the required air supply rate Q. Therefore, in this case, since the air supplied to the zone that does not need to be air-conditioned in the conventional technique can be sent to the other two zones, the air conditioning can be performed more efficiently as a whole.

In the above-described embodiment, the case where there is only one room 12 to be air-conditioned is shown, but the present invention is effective even when there are two or more rooms 12 to be air-conditioned.
The same can be applied by setting the required air supply amount Q for each.

[Brief description of drawings]

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

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

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

FIG. 4 is a graph showing a control characteristic of a VAV unit in 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

Claims (1)

[Claims] 1. An air conditioner for heating or cooling at least outside air to supply the air into a room divided into a plurality of zones, temperature detecting means for detecting a temperature of each of the plurality of zones, and a plurality of the air conditioners. 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 supply volume for the entire room, the required air supply volume of the required air volume A target air volume to be supplied to each of the plurality of zones is an air volume proportionally divided, and when the total of the required air volumes is equal to or more than the required air supply volume, the required air volume is directly used as the target volume. It comprises a target air amount setting means for the amount, the air conditioning system.