JPH08219535A - Vav type air conditioning system - Google Patents

Abstract

PURPOSE: To dispense with a VAV unit for exclusive use by controlling a blower in a follow-up manner so that a detected value of static pressure detected by a static pressure detector be held at a prescribed set value of static pressure. CONSTITUTION: A blower capacity control system is constructed mainly of a blower 8, a static pressure sensor 22 measuring a static pressure at one prescribed point in a duct 4 and a blower controller 24 controlling the capacity of the blower 8. At the time of operation, the capacity of the blower 8 is controlled so that the measured value of the static pressure may follow up a set value of the static pressure determined on the basis of information on the opening of each of dampers 10A-10E belonging to a control part 18 and the measured value of the static pressure. Only by using a conventional type motor damper, according to this constitution, a VAV type air conditioning system of low cost and energy-saving can be constructed without using a VAV unit for exclusive use.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a VAV (Variable Air).
Volume: Variable air volume) air conditioning system,
In particular, it relates to capacity control of the blower.

[0002]

2. Description of the Related Art A VAV type air conditioning system is widely used as a device applied to individual air conditioning and energy saving. As shown in FIG. 4, in the VAV type air conditioning system 100, the air conditioned by the air conditioner 102 is provided by the blower 104 via the blower duct 106 so as to correspond to each individual air-conditioned space. (108
A, 108B, 108C). Each blower unit 108 is provided with blades 110 capable of proportionally controlling the opening, and the opening can be adjusted according to the required load. Further, a controller 112 is connected to the blower 104 to control the capacity of the blower 104.

In order to control the capacity of the blower of the VAV type air conditioning system, the following method has been conventionally used. (1) A method of detecting the static pressure at one point in the duct by a static pressure sensor provided in the duct, for example, in the immediate vicinity of the blower, and controlling the static pressure to be constant. However, the capacity control range of the blower is limited, and it is difficult to reduce the transfer power of the blower system. Dedicated V with CAV function
There is a problem that the AV unit is required and the apparatus itself becomes expensive.

(2) At least one VA in the system is detected by detecting a damper opening signal of a mechanical diaphragm type VAV unit.
A method to control the capacity of the blower so that the V unit is fully opened. However, like the method (1), a dedicated VAV unit having a CAV function is required, and the device itself is expensive. Further, there is a problem that pressure loss due to the CAV function occurs in the VAV unit, and the motive power is consumed.

(3) At least one VAV unit in the system is fully opened by using an electronic damper to detect the air volume, etc. (wind speed, static pressure) and the damper opening signal. How to control the capacity of the blower. However, since a dedicated VAV unit is required and two detection points for detecting the operating state of the VAV system are required, there is a problem that the apparatus itself becomes expensive.

(4) The "air volume-static pressure" relationship of the duct system is obtained in advance, and this is made to correspond to the rotational speed of the blower, and VAV
A method of detecting the opening signal of the unit, determining the air flow rate by calculation, and controlling the air blowing function and the VAV unit opening. However, since it is a control method based on prediction and is open loop control, it has a problem of poor versatility.

[0007]

DISCLOSURE OF THE INVENTION The present invention is based on the conventional VA.
The V type air conditioning system has been made in view of the above-mentioned problems, and its purpose is to use a conventional motor damper without using a dedicated VAV unit, thereby reducing the cost. New and improved V that can provide energy-saving VAV type air conditioning system
It is an object of the present invention to provide a blower operation control method for an AV type air conditioning system.

[0008]

In order to solve the above-mentioned problems, a VAV type air conditioning system according to the present invention has one blower capable of automatically controlling the amount of blown air, a blower system communicating with the blower, and Inside the blast system (for example, its blowing part)
A plurality of dampers (for example, electronic air volume adjustment dampers) installed in the air conditioner and capable of automatically controlling each opening individually, and one static pressure detector installed in the air blowing system are provided. Is configured to be tracked and controlled so that the static pressure detection value detected by the static pressure detector is maintained at a predetermined static pressure set value.

The static pressure setting value is set or updated on the basis of the opening information of each damper and the static pressure detection value. Further, an environment sensor (for example, a temperature sensor) is installed in each air-conditioned space corresponding to each damper, and the opening degree of each damper is automatically controlled individually according to a signal from each environment sensor. Then, when the opening degree of any of the dampers thus automatically controlled deviates from the preset predetermined range, the static pressure set value is updated.

[0010]

As described above, according to the present invention, it is not necessary to provide a dedicated VAV unit as in the conventional VAV type air conditioning system, and a general-purpose electronic air volume adjustment damper is installed in a ventilation system such as an air supply duct. Only by doing so, it is possible to construct a low pressure loss type low-priced VAV type air conditioning system.

Further, in controlling the capacity of the blower, it is not necessary to detect the opening degree of the VAV unit or the VAV air flow unlike the conventional system, and only the static pressure at one point in the duct is detected and the detected value is the static pressure. Optimal operation control can be achieved only by performing follow-up operation so that the set value is achieved.

At this time, the static pressure set value is set or updated on the basis of the opening information of each damper and the static pressure detection value, so that the static opening can be set at any time when the opening of any one of the dampers deviates from the predetermined range. By updating the pressure set value, optimum operation control of the blower can always be performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 1 is a system configuration diagram showing an embodiment of a VAV type air conditioning system configured according to the present invention, and FIG. 2 is an electronic variable air volume damper applicable to the system shown in FIG. FIG. 3 is a schematic cross-sectional view showing one embodiment, and FIG. 3 is a flowchart showing one embodiment of the operation of the system shown in FIG.

As shown in FIG. 1, a VAV according to the present invention.
The air conditioner system supplies an air conditioner 2 for optimizing the temperature and humidity of outside air or return air from the room, and sends air sent from the air conditioner 2 to an air conditioning area 6 via an air blowing system such as a duct 4. The blower 8 and the dampers 10 (10A to 10E) respectively installed in the auxiliary ducts 4A to 4E branching from the main duct 4 and extending to the individual air conditioning areas. In the illustrated example, the five sub-ducts 4A to 4A
Although a configuration in which five dampers 10A to 10E are installed for each of E is shown, the present invention is not limited to such an embodiment, and an arbitrary number may be selected according to the output of the blower 8 or the required air conditioning load. It goes without saying that the sub-duct and the damper can be installed.

Each damper 10 can be configured as an electronic variable air volume damper as shown in FIG. 2, for example. The illustrated damper 10 is a blade 1 that can be driven by a motor 12.
4 is configured as a butterfly type.
However, it goes without saying that the present invention is not limited to such an embodiment and can be applied to various damper structures capable of changing the flow passage cross section in the duct 4 by adjusting the opening degree. It should be noted that the motor 12 is instructed by the controller 18 on the motor opening degree, and information regarding this is temporarily stored in the control unit 18.

Further, as shown in FIG. 1, in the air-conditioning area 6, environmental sensors 20A-20 are provided at predetermined positions in the air-conditioned spaces 6a-6e corresponding to the outlets of the auxiliary ducts 4A-4E.
E, for example, a temperature sensor is installed, detects the temperature and humidity in each of the individual air-conditioned spaces 6a to 6e, and controls the controller 1
Can be sent to 8. Then, the control unit 18 controls each damper 1 based on the information from the environment sensors 20A to 20E.
The opening degree of each damper 10 can be adjusted so that a drive signal is sent to 0 and the environment of each individual air-conditioned space 6a-6e is optimized.

Further, the duct 4 is provided with a static pressure sensor 22 for measuring the static pressure at a predetermined point in the duct, and the static pressure detection value in the duct can be sent to the control unit 18. In the illustrated example, the static pressure sensor 22 is the blower 8
It is installed immediately downstream, but the invention is not limited to such an embodiment. According to the present invention, it is only necessary to detect the static pressure at any one point of the air blowing system such as the duct, and the static pressure sensor can be installed at any position of the air blowing system. However, as shown in FIG. 1, when the blower system is composed of the main duct 4 and the sub-ducts 4A to 4E branching from the main duct 4, the static pressure at any one point in the main duct 4 is detected. Is preferable from the viewpoint of stability of the control system.

The static pressure detection value detected as described above is compared with the static pressure set value determined by the control unit 18 in the control unit 18, and the static pressure detection value follows the static pressure set value. Drive signal is sent to the blower controller 24,
It is possible to control the output of the blower 8. As described above, according to the present invention, the capacity of the blower 8 can be optimally controlled only by detecting the static pressure at one point in the duct.

By the way, as in the conventional VAV type air conditioning system, simply adjusting the opening degree by using a motor driven damper causes interference between the dampers and the air volume is not stable. Environment control is not possible. Therefore, the system shown in FIG. 1 achieves optimum environmental control by adopting two control systems, an environmental control system and a blower functional force control system.

(1) Environmental control system The environmental control system is a general-purpose motor-driven damper 10 (10
A to 10E) and environment sensors 20A to 20E installed in the air-conditioned spaces 6a to 6e to measure the environment (for example, temperature).
Drive the motor 12 to drive each damper 10 (10A-10
It is mainly composed of a motor controller 16 for controlling the opening degree of E). Then, during operation, each of the air-conditioned spaces 6a-6
The operation control is performed so as to adjust the opening degree of each of the dampers 10A to 10E so that the environmental measurement value at e follows the required environmental setting value.

On the other hand, the blower functional force control system includes a blower 8, a static pressure sensor 22 for measuring the static pressure at a predetermined point in the duct 4, and a blower controller 24 for controlling the capacity of the blower 8. It is mainly composed of. And during operation,
The capacity control of the blower 8 is performed so that the static pressure measurement value follows the static pressure setting value determined from the opening degree information of each of the dampers 10A to 10E owned by the control unit 18 and the static pressure measurement value.

Next, the operation of the VAV type air conditioning system configured as described above will be described with reference to the flow chart shown in FIG. First, in order to operate the VAV type air conditioning system according to the present invention, the operation of the air conditioner 2 and the blower 8 is started in step S1.

(1) Initial static pressure value setting operation After starting the operation of the system, the process proceeds to step S2, and the initial static pressure value is set. That is, the static pressure sensor 22
The initial value (k) of the static pressure in the damper 4 is measured by and the measured value is stored.

(2) Environmental control operation After setting the initial static pressure value, an environmental control operation for optimizing the environment of each air-conditioned space 6a-6e is performed. First, in step S3, the environment (for example, temperature) of each of the air-conditioned spaces 6a to 6e is measured, and the information is sent to the control unit 18.
Next, in step S4, the air conditioning space 6 is controlled by the control unit 18.
The damper 10A necessary for optimizing the temperatures of a to 6e
The opening of 10 to 10E is obtained, and the opening information is used for each damper 10A.
It sends to each motor control part 16 of 10E.

Next, in step S5, the motor 12 is driven in accordance with the opening information sent from the control unit 18, and the dampers 10A-10E are opened so that the temperatures of the air-conditioned spaces 6a-6e are optimized. Adjust the degree individually.

(3) Static pressure set value updating operation After optimizing the environment of each air-conditioned space 6a-6e, the control unit 1
The static pressure set value stored in step S2 is updated based on the opening degree information of the dampers 10A to 10E owned by 8 and the static pressure measurement value sent from the static pressure sensor 22. First, in steps S6 and S7, the dampers 10A to 1A after the environmental control of the respective conditioned air spaces 6a to 6e are performed.
It is determined whether or not any of the opening degrees of 0E is within a preset allowable opening range (β ≧ α ≧ γ).

In step S6, all the dampers 10A ...
The current opening of 10E is the upper limit value (β) of the allowable opening range (α)
Is exceeded. As a result, if the current opening of any of the dampers 10A to 10E exceeds the upper limit (β) of the allowable opening range (α), the static pressure is insufficient, so the process proceeds to step S8, A set value obtained by adding a constant value (x) to the static pressure set value stored in S2 is stored in the memory as a new static pressure set value.

If it is determined in step S6 that the current opening of all the dampers 10A to 10E is less than or equal to the upper limit (β) of the allowable opening range (α), step S6 is performed.
7, it is determined whether or not the current opening degrees of all the dampers 10A to 10E are less than the lower limit value (γ) of the allowable opening range (α). As a result, either damper 10A-10
If it is determined that the current opening degree of E is less than the lower limit value (γ) of the allowable opening range (α), it means that the static pressure is excessive. A set value obtained by subtracting a constant value (y) from the pressure set value is stored in the memory as a new static pressure set value.

As a result of the above sequence, in step S6 and step S7, all the dampers 10A to 10E are
If it is determined that the present opening degree is within the allowable opening range (β ≧ α ≧ γ), it is considered that the current static pressure setting value is appropriate, so the process proceeds to step S10, and in step S2. The stored static pressure set value can be used as it is.

(4) Static Pressure Control of Blower System After the static pressure setting value is determined as described above, the sequence proceeds to step S11, and the static pressure detection value detected by the static pressure sensor 22 is set to the static pressure setting value. The capacity control of the blower 8 is performed so as to follow the value. After that, steps S1 to S
By repeating the 11 loops, the operation control of the VAV type air conditioning system constructed according to the present invention is performed.

Although the VAV type air conditioning system according to one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various types are included within the scope of the technical idea described in the claims. Needless to say, changes and modifications can be made.

Particularly regarding the installation of the dampers 10A to 10E, each of the dampers 10A to 10E is connected to the duct 4 (4A to 4E).
It is possible to easily configure the VAV outlet by installing the VAV outlet in the outlet. In this case, the sensors (VAV opening sensor, VAV air volume sensor, etc.) attached to the conventional VAV unit can be omitted, so that a more compact system can be constructed.

[0033]

As described above, according to the present invention, a low-cost and energy-saving VAV can be realized by using a conventional motor damper without using a dedicated VAV unit.
It is possible to build a formula air conditioning system.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of a VAV type air conditioning system configured according to the present invention.

FIG. 2 is a schematic sectional view of an electronic variable air volume damper applicable to the system shown in FIG.

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

FIG. 4 is a system configuration diagram showing an outline of a conventional VAV type air conditioning system.

[Explanation of symbols]

 2 Air-conditioner 4 (4A-4E) Duct 6 (6a-6e) Air-conditioning area (air-conditioned space) 8 Blower 10 (10A-10B) Damper 16 Motor controller 18 Controller 20A-20E Environmental sensor 24 Blower controller

Claims (7)

[Claims] 1. A blower capable of automatically controlling the amount of blown air,
A blower system communicating with the blower, a plurality of dampers installed in the blower system and capable of automatically controlling the respective opening degrees, and one static pressure detector installed in the blower system The VAV type air conditioning system is configured so that the blower is controlled so that the static pressure detection value detected by the static pressure detector is maintained at a predetermined static pressure set value. 2. The VAV type air conditioning system according to claim 1, wherein the static pressure setting value is set or updated based on opening degree information of each damper and the static pressure detection value. . 3. An environment sensor installed in each air-conditioned space corresponding to each damper, wherein the opening of each damper is automatically controlled individually according to a signal from each environment sensor. The VAV type air conditioning system according to claim 1 or 2. 4. The static pressure set value is updated when the opening degree of any one of the dampers deviates from a predetermined range set in advance. VAV type air conditioning system. 5. The VAV type air conditioning system according to claim 1, wherein each of the dampers is installed in a blowout part of the blower system. 6. The VAV type air conditioning system according to claim 1, wherein each of the dampers is an electronic air volume adjusting damper. 7. The VAV type air conditioning system according to claim 3, wherein the environment sensor is a temperature sensor.