JPH0697112B2 - Control unit for air handling unit - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air handling unit used for air conditioning of a building or the like.

2. Description of the Related Art Conventionally, an air handling unit has been often used for air conditioning of buildings and the like, but in recent years, control devices have become more sophisticated in order to improve comfort in air conditioning and reduce driving power.

Hereinafter, a conventional controller for an air handling unit as described above will be described with reference to the drawings.

In FIG. 4, reference numeral 1 denotes an air handling unit housing, and inside the air handling unit housing 1, there are a blower 2 for sending the air heat-exchanged by the heat exchanger 3 into the room, a filter 4, an exhaust air volume and a circulating air volume. It has an adjustment damper 5 and blows air to the air-conditioned room 7 via an air supply duct 6. The air handling unit housing 1 and the air-conditioned room 7 are connected by an air duct 8. An indoor temperature sensor 9 electrically connected to an indoor temperature detection unit 26 of the control device 24 is installed inside the air-conditioned room 7, and an air supply temperature detection unit 30 of the control device 24 is installed inside the air supply duct 6. A supply air temperature sensor 10 electrically connected to the supply air temperature sensor 10 is installed.

The control device 24 is a signal from the indoor temperature setting unit 25 and an indoor temperature detecting unit.
26, an indoor temperature comparison unit 27 for comparing signals with 26, a blower rotation speed command unit 28 for arithmetically amplifying the signal of the indoor temperature comparison unit 27 and controlling the rotation speed of the blower via an inverter, and an air supply temperature setting unit 29. Air supply temperature comparison unit 31 for comparing the signal of the supply air temperature detection unit 30 and the signal of the air supply temperature detection unit 30 and a valve for adjusting the amount of water in the heat exchanger via the valve drive device by arithmetically amplifying the signal of the air supply temperature comparison unit 31. The valve opening commanding section 32 for controlling the The blower rotation speed command unit 28, the inverter 33, the valve opening command unit 32, and the valve drive device 35 are electrically connected to each other.

Next, the operation of the above configuration will be described. The air blown by the blower 2 circulates to the air handling unit housing 1 via the air supply duct 6, the air-conditioned room 7, and the air circulation duct 8,
It is sucked into the blower 2 through the damper 5, the filter 4 and the heat exchanger 3. The damper 5 adjusts the exhaust amount and the intake amount by adjusting its rotation angle. Meanwhile, the indoor temperature sensor 9
The temperature signal obtained by the supply air temperature sensor 10 is input to the indoor temperature detection unit 26 and the supply air temperature detection unit 29 of the control device 24 to control the air handling unit.

Next, the operation and action of the control device 24 will be described.

The operation of the controller 24 is divided into a part that controls the blower 2 according to the room temperature and a part that controls the valve 34 according to the supply air temperature.

FIG. 5 is a flow chart showing a valve control method, and FIG. 6 is a flow chart showing a blower control method.

In FIG. 5, the indoor temperature setting unit 25 sets a set value T _R by the operator, and the indoor temperature detecting unit 26 detects the indoor temperature t _R by the indoor temperature sensor 9. The indoor temperature comparison unit 27 obtains the indoor temperature deviation e _{R as} shown in equation (1).

e _R = T _R −t _R ………… (1) The fan rotation speed command unit 28 performs the PID calculation shown in equation (2) from the indoor temperature deviation e _R obtained by the indoor temperature comparison unit 27, determining the rotational speed V _R, and sends a signal to the inverter 33.

Here, K _cR is a proportional gain, T _iR is an integration time, and T _dR is a derivative time, which is a parameter given a constant value by the operator.

After that, the same operation is repeated by returning to the indoor temperature detection unit 26.

In FIG. 6, the set value T _S is set by the operator in the supply air temperature setting unit 29, and the supply air temperature sensor 10 detects the supply air temperature t _{3 in the} supply air temperature detection unit 30. The supply air temperature comparison unit 31 obtains the supply air temperature deviation e _S as shown in the equation (3).

e _S = T _S −t _S (3) In the valve opening command section 32, the PID calculation shown in the equation (4) is performed from the supply air temperature deviation e _S obtained by the supply air temperature comparing section 31. It determines the valve opening U _V and sends a signal to the valve drive unit 35.

Here, K _cS is a proportional gain, T _iS is an integration time, and T _dS is a derivative time, which is a parameter given a constant value by the operator.

After that, the same operation is repeated by returning to the supply air temperature detection unit 30.

The room temperature can be kept constant by the above two controls.

Problems to be Solved by the Invention However, in the above configuration, since the valve opening calculation parameter is constant, the proportional gain K _cS, which is one of the valve opening calculation parameters, is large depending on the rotation speed of the blower _as in air conditioning. It may be an inappropriate value for load fluctuation,
There is a problem that the valve causes hunting and smooth room temperature control cannot be achieved.

The present invention solves such a problem, and an object of the present invention is to provide an air handling unit capable of achieving smooth indoor temperature control without causing hunting of the valve.

Means for Solving the Problems In order to solve this problem, the control device for an air handling unit according to the present invention sets an indoor temperature detection unit to which a signal of a temperature sensor for detecting an indoor temperature is input, and an indoor temperature. The indoor temperature setting unit, the indoor temperature comparison unit that compares the signal output from the indoor temperature detection unit with the signal output from the indoor temperature setting unit, and the signal of the indoor temperature comparison unit is input, A blower rotation speed command unit that controls the rotation speed, a supply air temperature detection unit that receives a signal from a supply air temperature sensor that detects the supply air temperature, a supply air temperature setting unit that sets the supply air temperature, and the supply air supply unit. Parameter calculation for calculating the valve opening calculation parameter by inputting the air supply temperature comparison unit for comparing the output signal of the air temperature detection unit with the output signal of the air supply temperature setting unit and the rotation speed signal of the blower rotation speed command unit And the salary The output signal from the air temperature comparison unit and the output signal from the parameter calculation unit are input, and the valve opening command unit controls the valve via the valve drive device.

With this configuration, the blower rotation speed command unit calculates the blower rotation speed based on the signal from the indoor temperature comparison unit, and the parameter calculation unit calculates the valve opening calculation parameter based on the rotation speed signal from the blower rotation speed command unit and opens the valve. The degree command section controls the valve by calculating the valve opening based on the signal from the supply air temperature comparing section and the output signal from the valve opening calculating parameter calculating section.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 1, the same parts as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, the present invention is characterized by the control device, and the configuration of the control device 11 will be described.

An indoor temperature detection unit 13 electrically connected to an indoor temperature sensor 9 for detecting the temperature in the air-conditioned room 7, an indoor temperature setting unit 12 set to keep the indoor temperature constant, and the two detections. The indoor temperature comparison unit 14 calculates the difference by inputting and comparing the set indoor temperature with the set indoor temperature.

Further, there is provided a blower rotation speed command unit 15 for inputting the calculated temperature difference and changing the rotation speed of the blower 2 so as to attain the set indoor temperature and performing a calculation for increasing or decreasing the air volume. is doing.

Further, the supply air temperature sensor 10 for detecting the temperature of the air in the duct discharged from the blower 2 is electrically connected to the supply air temperature detector 17, and the supply air temperature is set to keep the supply air temperature constant. The air temperature setting unit 16 has an air supply temperature comparison unit 18 for calculating the difference by inputting and comparing the two detected air supply temperatures with the set air supply temperature, and the parameter calculation unit 19 has the blower. The rotation speed signal of the rotation speed command unit 15 is input and calculation parameters are calculated. This calculated signal and the supply air temperature comparison unit
Two signals, the signal output from 18, are the valve opening command section 20.
The valve drive device 23 is controlled by the value that is input to and calculated.

Next, the operation and action of the control device 11 will be described.

The operation of the control device 11 is divided into a part that controls the blower according to the room temperature and a part that controls the valve according to the supply air temperature.

In FIG. 2, the operator sets a set value T _R in the room temperature setting unit 12, and the room temperature sensor 9 detects the room temperature t _{R in} the room temperature detecting unit 13. The indoor temperature comparison unit 14 calculates the indoor temperature deviation e _{R as} shown in the equation (5).
Is required.

e _R = T _R −t _R (5) The blower rotation speed command unit 15 performs the PID calculation shown in the equation (6) from the indoor temperature deviation e _R obtained by the indoor temperature comparison unit 14 to perform the blower operation. The rotation speed V _R of the _motor is determined and a signal is sent to the inverter 21.

Here, K _cR is a proportional gain, T _iR is an integration time, and T _dR is a derivative time, which is a parameter given a constant value by the operator.

After that, the same operation is repeated by returning to the indoor temperature detecting section.

In FIG. 3, the air supply temperature setting unit 16 sets a set value T _S by the operator, and the air supply temperature detecting unit 17 detects the air supply temperature t _S by the air supply sensor 10. The supply air temperature comparison unit 18 obtains the supply air temperature deviation e _S as shown in the equation (7).

The _{e S = T S -t S ............} (7) blower rotation speed V _R calculated by the blower speed command unit 15, the parameter calculating unit 19 based on, PID by Equation (8)
The proportional gain K _cS , which is one of the control parameters, is determined.

Here, V _max is a constant that is given by the operator at the blower maximum rotation speed. Further, k _cS is a constant given by the operator as an optimum proportional gain when the rotation speed of the blower 2 is maximum.

The valve opening command unit 20 performs the PID calculation shown in the equation (9) from the supply air temperature deviation e _S obtained by the supply air temperature comparison unit 18 and the proportional gain K _cS calculated by the parameter calculation unit 19 to perform the PID calculation. Opening
U _V is determined and a signal is sent to the valve drive device 23.

Here, T _iS is an integration time, and T _dS is a derivative time, which is a parameter given a constant value by the operator.

After that, the same operation is repeated by returning to the supply air temperature detection unit.

The room temperature can be kept constant by the above two controls.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiment, according to the present invention, the parameter calculation unit adjusts the proportional gain, which is one of the valve opening calculation parameters, to an optimum value according to the rotation speed of the blower. For example, when the air flow rate decreases and the dust temperature is greatly affected by the opening degree of the valve, the upper limit of the opening degree of the valve is suppressed, and smooth indoor temperature control can be achieved without causing hunting of the valve. it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a schematic configuration of an air handling unit and its control device in an embodiment of the present invention, FIG. 2 is a flow chart showing control of a blower of the control device, and FIG. Is a flow chart showing control of valves of the control device, FIG. 4 is a view showing a schematic configuration of a conventional air handling unit and its control device, FIG. 5 is a flow chart showing control of a blower of the control device, and FIG. 3 is a flowchart showing a valve control of the control device. 2 ... Blower, 9 ... Indoor temperature sensor, 10 ... Air temperature sensor, 11 ... Control device, 12 ... Indoor temperature setting unit, 13 ...
… Indoor temperature detection unit, 14 …… Indoor temperature comparison unit, 15 …… Blower rotation speed command unit, 16 …… Supply air temperature setting unit, 17 …… Supply air temperature detection unit, 18 …… Supply air temperature comparison unit, 19 …… Parameter calculation part, 20 …… valve opening command part, 21 …… inverter, 22 ……
Valve, 23 ... Valve drive.

Claims (1)

[Claims] 1. An indoor temperature detecting unit to which a signal from a temperature sensor for detecting an indoor temperature is input, an indoor temperature setting unit to set an indoor temperature, a signal output from the indoor temperature detecting unit and an indoor temperature setting unit. The indoor temperature comparison unit that compares the signal output from the indoor temperature comparison unit, the signal of the indoor temperature comparison unit is input, the blower rotation command unit that controls the rotation speed of the blower, and the supply air temperature sensor that detects the supply air temperature. A supply air temperature detection unit to which a signal is input, a supply air temperature setting unit that sets the supply air temperature, and a supply air temperature that compares the output signal of the supply air temperature detection unit and the output signal of the supply air temperature setting unit. A comparison unit, a parameter calculation unit that inputs a rotation speed signal of the blower rotation speed command unit and calculates a valve opening calculation parameter, an output signal of the air supply temperature comparison unit, and an output signal of the parameter calculation unit The valve is controlled via the valve drive device. Control device for an air handling unit comprising constituting the valve opening command unit for.