JPH08105647A - Air conditioning system - Google Patents

Abstract

(57) [Summary] [Composition] Based on the room temperature and required temperature of each zone, the air volume of the VAV unit provided in relation to the air supply port of each zone is controlled, and the air volume control range of each VAV unit is controlled. The supply air temperature is controlled so that the weighted average value of the room temperature weighted by the maximum value becomes equal to the weighted average value of the required temperature weighted by the maximum value of the air volume control range of each VAV unit. [Effect] It is possible to always control the supply air temperature to the optimum value regardless of the state of the VAV unit, and improve the responsiveness to the set required air volume.

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 that individually air-conditions a plurality of zones using one air conditioner.

[0002]

2. Description of the Related Art An example of this type of air conditioning system is disclosed in Japanese Patent Application No. 2-339050. In this conventional technique, a variable air volume unit (hereinafter referred to as "VAV unit") is provided in association with the air supply ports of a plurality of zones, and as shown in the graph of FIG. 5 based on the temperature deviation between room temperature and required temperature. Each VAV unit is controlled according to the control characteristics. Then, the number of VAV units in which the temperature deviation between the room temperature and the required temperature exceeds the control range (± 1 ° C.), that is, the number of VAV units in the capacity excess / deficiency state is grasped, and the number of VAV units whose temperature deviation is + 1 ° C. or more is determined. V below -1 ℃
A majority decision is made based on the number of AV units, and the supply air temperature is controlled so as to reduce the number of VAV units having an insufficient capacity.

[0003]

In the prior art, each VA
Since the supply air temperature is controlled (floating control) according to the signal from the V unit, there is a problem that a deviation occurs between the actual supply air temperature and the optimum value. Further, as can be seen from the graph of FIG. 6, since the supply air temperature is not changed unless at least one VAV unit is in a capacity excess / deficiency state, there is a problem of poor responsiveness.

Therefore, a main object of the present invention is to provide an air conditioning system capable of controlling the supply air temperature at an optimum value and improving the responsiveness.

[0005]

The present invention is directed to an air conditioner for heating or cooling at least return air and supplying it to each of a plurality of zones, and a room temperature detection for detecting a room temperature of each of the plurality of zones. Means, a required temperature setting means for setting a required temperature for each of the plurality of zones, for individually controlling the supply air amount to be supplied to each of the plurality of zones based on a temperature deviation between the room temperature and the required temperature. Variable air volume unit,
Required temperature average calculation means for calculating a weighted average value of the required temperature weighted by the maximum value of each air supply amount control range of the variable air volume unit, calculating a weighted average value of the room temperature weighted by the maximum value Room temperature average calculation means for
And a supply air temperature control means for controlling the temperature of the supply air supplied to each of the plurality of zones so that the weighted average value of the room temperature becomes equal to the weighted average value of the required temperature.
It is an air conditioning system.

[0006]

The amount of air supplied to each of the plurality of zones is individually controlled based on the temperature deviation between the room temperature detected by the room temperature detecting means and the required temperature set by the required temperature setting means, and the VAV unit is controlled. The air supply temperature is controlled (cascade control) so that the weighted average value of the room temperature weighted by the maximum value of the air supply amount control range becomes equal to the weighted average value of the required temperature.

[0007]

According to the present invention, the supply air temperature can be controlled to an optimum value and the responsiveness can be improved. 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 EMBODIMENTS Referring to FIG. 1, an air conditioning system 10 of this embodiment is for simultaneously air-conditioning three zones 14 in a building 12 and includes an air conditioner 18 controlled by a controller 16. Including. 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. Further, inside the casing 20, an air filter 26, a heat exchanger 28, and an air supply fan 30 are arranged in this order from the upstream side, and outside the casing 20, an electric valve for operating the heat exchanger 28. An inverter 34 and the like for controlling the rotation speeds of 32 and the air supply fan 30 are provided.

On the other hand, an air supply port 36 and a return air port 37 are formed in each zone 14, and the air supply port 36 and the air conditioner 18 are provided.
Of the air conditioner 18 are communicated with each other through the 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. . Further, the air intake port 24 of the air conditioner 18 communicates with an outside air duct (not shown) for taking in outside air. Further, the air supply duct 38 is provided with a VAV unit 44 including a damper 40 and a wind speed sensor 42 in association with the air supply port 36 of each zone 14, and each VAV unit 44 is provided in each zone 14. Room thermo 46
Is connected. The room thermostat 46 has a temperature detector 48.
And a temperature setter 50 is provided. Further, at the inlet of the air supply duct 38, a temperature sensor 52 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 54 of the controller 16, and the temperature sensor 5
2 is connected to the AI (analog input) terminal 56,
Each VAV unit 44 is connected to the SIO (serial input / output) terminal 58. When a power switch (not shown) of the air conditioning system 10 is turned on, the air supply fan 30 is driven and cold water or hot water is caused to flow through the heat exchanger 28. When the required temperature is set by the temperature setter 50 provided in each room thermostat 46, each zone 14 in each room thermostat 46 is set based on the temperature deviation between the set required temperature and the room temperature detected by the temperature detector 47. The target air supply amount to be supplied to the
It is given to the V unit 44. Therefore, each air supply port 3
Each VAV unit 44 is controlled so that the air supply amount supplied from 6 to each zone 14 becomes equal to each target air supply amount. Further, the rotation speed of the air supply fan 30 is controlled by the inverter 34 so that the amount of air blown from the air conditioner 18 becomes equal to the total of the target air supply amounts. In addition, each VA
The air volume control characteristic of the V unit 44 is represented by a graph as shown in FIG.

[0012] Then, with such air supply amount control,
The supply air temperature control as shown in the flowchart of FIG. 2 is executed. When the supply air temperature control is started, first, step S1
, The required temperature Ts weighted by the maximum values K1, K2 ... Kn of the supply air amount control range of each VAV unit 44.
The weighted average value TS of 1, Ts2, ..., Tsn is calculated according to the equation (1).

[0013]

## EQU00001 ## TS = (Ts1.times.K1 + ... + Tsn.times.Kn) /. SIGMA.Kn In step S3, the room temperature Tr1, of each zone 14 weighted by the maximum value K1, K2, ... Kn of the supply amount control range of each VAV unit 44. The weighted average value TR of Tr2 ... Trn is calculated according to the equation (2).

[0014]

## EQU2 ## TR = (Tr1 × K1 + ... + Trn × Kn) / ΣKn Then, in step S5, the room temperature deviation ΔT between the weighted average value TS of the required temperature and the room temperature weighted average value TR.
Is calculated, and the supply air temperature set value Tsasp is calculated according to the equation (3). Therefore, when the room temperature deviation ΔT is large, the supply air temperature set value Tsasp has a large difference from the reference value To, and when the room temperature deviation ΔT is small, the supply air temperature set value Tsasp is set.
The difference between sasp and the reference value To is reduced.

[0015]

## EQU3 ## Tsasp = G {ΔT + (1 / T) ∫ΔTdt} + To where G is a gain, T is an integration time, and To is a reference value. In the following step S7, the temperature sensor 52
Supply air temperature Tsa detected by (FIG. 1) and step S
The supply air temperature deviation ΔTsa from the supply air temperature set value Tsasp calculated in 3 is calculated, and the valve operation amount Y is calculated according to the equation (4). Electric valve 32 provided in association
Is controlled. That is, when the supply air temperature deviation ΔTsa is large on the plus (positive) side, the valve opening is increased by increasing the operation amount Y of the valve, and the supply air temperature deviation Δ
When Tsa is on the negative side, the opening amount of the valve is reduced by decreasing the valve operation amount Y.

[0016]

Y = G {ΔTsa + (1 / T) ∫ΔTsadt} +50 In this way, the supply air temperature is controlled so that the weighted average value TR of the room temperature becomes equal to the weighted average value TS of the required temperature ( Cascade control). The flow chart of FIG. 2 shows the supply air temperature control operation during cooling, and the valve operation in step S7 is reversed during heating. That is, when the value of the valve operation amount Y is large, the hot water valve is operated small, and when the value of the valve operation amount Y is small, the hot water valve is operated large.

According to this embodiment, as shown in the graph of FIG. 3, the supply air temperature can always be controlled to the optimum value regardless of the state of the VAV unit 44. Further, since the air supply temperature is controlled using the average values TS and TR weighted by the maximum value (maximum air volume) of the air supply volume control range of the VAV unit 44 (FIG. 2), the maximum air volume is large. The zone 14 provided with the VAV unit 44 can be preferentially air-conditioned.

[Brief description of drawings]

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

FIG. 2 is a flow chart showing a supply air temperature control operation in the embodiment of FIG.

FIG. 3 is a graph showing the relationship between air supply temperature and air supply amount in the embodiment of FIG.

FIG. 4 is a graph showing an air volume control characteristic of a VAV unit.

FIG. 5 is a graph showing the relationship between the supply air temperature and the supply air amount in the prior art.

[Explanation of symbols]

 10 ... Air conditioning system 14 ... Zone 16 ... Controller 18 ... Air conditioner 44 ... VAV unit 46 ... Room thermo 48 ... Temperature detector 50 ... Temperature setting device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuuji Watanabe 1-1-1 Hama, Amagasaki City, Hyogo Prefecture Kubota Technology Development Laboratory Co., Ltd.

Claims (1)

[Claims] 1. An air conditioner for heating or cooling at least return air and supplying it to each of the plurality of zones, room temperature detecting means for detecting the room temperature of each of the plurality of zones, and Required temperature setting means for setting a required temperature for each, a variable air volume unit for individually controlling the amount of air supplied to each of the plurality of zones based on the temperature deviation between the room temperature and the required temperature A required temperature average calculating means for calculating a weighted average value of the required temperature weighted with the maximum value of the supply air amount control range of each of the variable air volume units; and a weight of the room temperature weighted with the maximum value. A room temperature average calculating means for calculating a weighted average value, and each of the plurality of zones such that the weighted average value of the room temperature is equal to the weighted average value of the required temperature. Comprising a supply air temperature control means for controlling the temperature of the air supply to the air conditioning system.