JP3122713B2 - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system which can reduce a load to a variable air volume device, and in addition, can realize the reduction of an air discharging fan carrying power at the same time, is effective in energy saving property and economic property. SOLUTION: By this system, the outside air is taken in and fed through reheaters RH1 , RH2 ,... from an air conditioner 11 which is temperature-humidity- controlled, and the air is discharged through variable air volume devices VAV1 , VAV2 ,... for a plurality of experiment animal breeding rooms R1 , R2 ,.... Then, the supply air temperature is controlled in such a manner that a temperature variation amount of the reheater which corresponds with the experiment animal breeding room with a largest sensible heat load, may become smallest. In addition, the air discharging amount or the outside air taking-in amount is controlled in such a manner that the air volume variation amount of the variable air volume device which corresponds with the experiment animal breeding room R with the largest air discharging amount may become largest.

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 for adjusting a room pressure, a temperature, and a humidity of a controlled room such as a laboratory animal breeding room.

[0002]

2. Description of the Related Art Dew point temperature control, which is a conventional method of controlling the temperature and humidity of a laboratory animal breeding room, uses a dew point temperature once corresponding to a predetermined room temperature and humidity in a constant temperature and humidity apparatus to control relative humidity more accurately. This is a control method in which the shortage of the sensible heat load in the room is adjusted by the reheat amount. In the air conditioning control of the experimental animal breeding room, the dew point temperature control aiming at the air conditioner outlet temperature constant on the air conditioner side and the temperature control by the room temperature detecting unit on each experimental animal breeding room side were used together. When the humid air is cooled to a certain temperature, water vapor in the air starts to condense and start to dew, that is, to start dew condensation. The dew point temperature refers to the temperature at this time.

FIG. 6 is a schematic diagram showing a terminal reheater air conditioning dew point temperature control system. Here, 1 is an air conditioner, 2 and 3 are control target rooms, CV is a chilled water valve, and HV and H
V _1, HV ₂ hot water valve, SV humidifying valve, T _D is the dew point temperature detector, T _S is the air conditioner outlet temperature detecting unit, T ₁ and T ₂
The indoor temperature detector, H ₁ and H ₂ is the indoor humidity detecting unit,
C indicates a controller, RH indicates a reheater (variable temperature device), and H ^* indicates an average calculator.

The dew point temperature controller has three controllers C of a dew point temperature controller 4, an air conditioner outlet temperature controller 5, and an indoor humidity controller 6 in order to form three closed loops corresponding to the number of outputs. . Each controller C determines an operation amount by a PID control (proportional + integral + differential control) operation from the cooling coil outlet air temperature _td , the air conditioner outlet temperature _ts, and (the average value of) the room humidity h ^* . The dew point temperature controller 4 determines the operation amount of the chilled water valve CV in order to make the cooling coil outlet air temperature, which is a control amount, coincide with the target value of the dew point temperature. Further, the air conditioner outlet temperature controller 5 determines the operation amount of the hot water valve HV in order to make the air conditioner outlet temperature equal to the target value. Further, the indoor humidity controller 6 determines the operation amount of the humidifying valve SV in order to make the indoor humidity match the target value.

The dew point temperature control method facilitates control by dividing an irregular control system having two inputs and three outputs into three control systems having one input and one output. The dew point temperature in the dew point temperature controller 4 is set to a value such that sufficient cooling and dehumidification are performed. This necessitates cooling and dehumidification even when the temperature and humidity conditions of the outside air are below the set values. The disadvantage is that it causes reheating and rehumidification. Especially, the middle period when the outside air is close to the indoor environment (spring or autumn)
In this case, economic efficiency is significantly impaired.

[0006]

In the prior art, it has been recognized that it is inevitable to sacrifice energy saving and economy in order to achieve high-precision temperature and humidity control and room pressure control. Was. Therefore, in the temperature / humidity control, the air is cooled, the moisture in the air is removed, and then reheating is performed. In the room pressure control, a fan and a VAV attached to each chamber to maintain a positive pressure are used. (Variable air volume device) was used ignoring energy saving.

[0007] The present invention has been made in view of the above circumstances, and can reduce the load on the variable air volume device while efficiently controlling the temperature and humidity, and can also simultaneously reduce the power required to transport the exhaust fan. It is another object of the present invention to provide an air conditioning system that is economically effective.

[0008]

To achieve the above object, an air conditioning system according to the present invention comprises an air conditioner in which outside air is taken in and the temperature and humidity are controlled, and a variable temperature device corresponding to the air conditioner. The air conditioner controls the plurality of control target chambers to be supplied with air and the variable temperature device corresponding to the control target chamber having the largest sensible heat load among the plurality of control target chambers so as to minimize the amount of temperature change. it is characterized in that it comprises a temperature control means for controlling the supply air temperature to the target chamber. The present invention also provides the air conditioning system
Each of the outlets of the controlled chambers
A variable air volume device which is connected correspondingly, and the plurality of controls
Corresponds to the controlled room with the largest displacement among the target rooms
Exhaust so that the amount of change in the air volume of the variable air volume device is the largest
Means for controlling the amount of air or the amount of outside air taken in.
It is characterized by having.

In the temperature control means, the state of the sensible heat load of each room is known from the opening degree of the reheater (variable temperature device) hot water valve installed in each controlled room, and the temperature is sequentially determined based on the information. This is to control the blast temperature. As a result, waste of reheating is reduced, energy can be saved,
The effect is also improved from the economic aspect. In the air volume control means, the load on the VAV generated to control the room pressure is known by knowing the opening degree of the VAV installed in each control target room, and the exhaust damper and the exhaust damper are provided to reduce the load. It controls the outside air damper. As a result, the load on the VAV can be reduced, and the power for conveying the exhaust fan can be reduced at the same time, which is effective for energy saving and economy.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration explanatory view showing an embodiment of the present invention. That is, the outside air is taken into the air conditioner 11 through the outside air motor-damping MD _1. The air conditioner 11 includes a cooling coil 12, a heating coil 13, and a steam spray 14. Cold water is supplied to the cooling coil 12 through a cold water valve CV, and hot water is supplied to the heating coil 13 through a hot water valve HV. The steam is supplied to the steam spray 14 via a humidification valve SV. The air conditioner 11
The outlet side via the air supply fan F ₁ and the air conditioner outlet temperature detection unit T _s plurality of the controlled chamber, for example, experimental animal room R _1, R _2, ... Rehita RH respectively corresponding to R _10
1, RH _2, connected to the inlet side of the ... RH _10, the respective Rehita RH _1, RH _2, ... outlet experimental animal room respectively corresponding R ₁ of RH _10, R _2, ... inlet of the R ₁₀ Connected to the side. Each Rehita RH _1, RH _2, ... hot water valve HV _1, HV ₂ respectively corresponding to the RH _10, hot water through the ... HV ₁₀ is supplied. The laboratory animal breeding room R
_1, R _2, ... indoor temperature detector T ₁ respectively corresponding to _{R 10, T 2, ... T} 10, the indoor humidity detecting unit H _1, H _2, ... H
_10, chamber pressure detecting unit _{dP 1, dP 2, ... dP} 10 is provided. The exit sides of the experimental animal breeding rooms R ₁ , R ₂ ,... R ₁₀ correspond to the variable air volume devices VAV ₁ , VAV
_2, ... are connected to the inlet side of the VAV _10, the respective variable air volume system VAV _1, VAV _2, ... outlet side of the VAV ₁₀ after being in common, is exhausted through the exhaust motor-damping MD ₂ and the exhaust fan F ₂ You.

Next, a description will be given of the blower temperature drive control. The laboratory animal breeding facilities, a number of experiments with a single air-conditioning systems animal room R _1, R _2, ... to correspond to R _10, each chamber R _1, R _2, ... Rehita RH _1, RH ₂ to R _10, ... RH
_{Set 10} and adjust the temperature. Therefore, the reheat load of the room having the largest sensible heat load is reduced to zero, that is, the air conditioner 11
A higher air conditioner outlet temperature on the side leads to energy savings. This determines a target value for the temperature control by the air conditioner outlet temperature detecting portion T _s of the air conditioner 11 side from the blast temperature drive control in order to eliminate the waste of air-conditioning.

[0012] order to reduce the reheat load, a larger room sensible heat load, i.e. chambers _R 1, R _2, ... hot water valve Rehita is attached to _{R 10 HV 1, HV 2,} ...
In the HV ₁₀ , a room with a valve with the smallest opening is found, and the air conditioner 11 causes the respective rooms R ₁ , R ₂ ,
... to control the blast temperature to R _10. As shown in the control rule table 1 of FIG. 2, the control operation is based on the following basic rules (rule:
Rule).

[Rule 1] Reheater hot water valve HV ₁ ,
If one of the HV ₂ ,... HV ₁₀ is closed and the valve is opening, the blast temperature is increased. [Rule 2] Rehita hot water valve for HV _1, HV _2, ... H
One is not closed among V _10, when the valve is not operated, be higher than the room temperature is the set temperature, do nothing blowing temperature.

[Rule 3] Reheater hot water valve HV ₁ ,
When one of HV ₂ ,... HV ₁₀ is closed and its valve is not operated, if the room temperature is higher than the set temperature, the air blowing temperature is lowered.

[Rule 4] Reheater hot water valve HV ₁ ,
If one of HV ₂ ,... HV ₁₀ is closed and its valve is closing, the air blowing temperature is lowered. [Rule 5] Rehita hot water valve for HV _1, HV _2, ... H
If the open V ₁₀ is all, raise the blast temperature.

In the following, the control algorithm is shown in steps. [Step 1] Each control target room (experimental animal breeding room R ₁ ,
R _2, ... hot water valve is attached Rehita to _{R 10) HV 1, HV 2} , of ... HV _10, find the smallest valve opening.

[Step 2] A temperature deviation (set temperature-measured temperature) is determined. [Step 3] Fuzzy inference is performed using the prepared rules (see control rule table 1).

[Step 4] The amount of increase or decrease of the air conditioner outlet temperature is determined. [Step 5] An increase / decrease amount is added to the current air setting temperature. [Step 6] [Step 1] to [Step 5]
repeat.

FIG. 3 shows a form of fuzzy inference of air temperature drive control and temperature / humidity control in room pressure / temperature / humidity control of a laboratory animal breeding room. However, the room average humidity is an average value of the humidity of each room R ₁ , R ₂ ,..., R ₁₀ . In the figure, S is an operator for finding the difference between the previous (current) control deviation (at (t-1)) and the current control deviation (at (t)), that is, a change in the control deviation.

The main inference mechanism of the blower temperature drive control was constituted by one block. That is, the reheater hot water valve HV
_1, HV _2, ... infer minimum opening a blowing temperature decreasing manipulated variable from the temperature of the room of the HV _10. The inference block is composed of the blast temperature fuzzy inference.

Next, the fuzzy constant temperature / humidity control of two stages and five blocks will be described. That is, the first stage is composed of two inference blocks, a temperature required amount fuzzy inference block and a humidity required amount fuzzy inference block, and a temperature required amount and a humidity required amount for making the room temperature / humidity which is a control amount coincide with a target value. Is inferred. The required temperature is inferred from the air setting temperature and the air conditioner outlet temperature, and the required humidity is inferred from the set humidity and the room average humidity. The second stage is composed of three inference blocks: a chilled water valve increase / decrease operation amount fuzzy inference block, a hot water valve increase / decrease operation amount fuzzy inference block, and a humidification valve increase / decrease operation amount fuzzy inference block.
Humidity demand, current (previous) chilled water valve operation amount CVφ (t−
1) From the current (previous) hot water valve operation amount HVφ (t−1) and the current (previous) humidification valve operation amount SVφ (t−1), the current chilled water valve increase / decrease operation amount dCVφ (t), the current hot water Valve increase / decrease operation amount dHVφ (t) and current humidification valve increase / decrease operation amount d
Infer SVφ (t). The current cold water valve increase / decrease operation amount dCVφ (t) and the current hot water valve increase / decrease operation amount dHVφ
(T) and the current humidifying valve increase / decrease operation amount dSVφ (t) are set to the current (previous) cold water valve operation amount CVφ (t−1), the current (previous) hot water valve operation amount HVφ (t−1), and the current ( Last time)
To the current humidifying valve operation amount SVφ (t-1), the current cold water valve operation amount CVφ (t), and the current hot water valve operation amount HVφ
(T) and the current humidification valve operation amount SVφ (t).

Next, the control for reducing the power for transporting the exhaust fan will be described. Experimental animal room R _1, R _2, ... R
_{In 10} , it is required to maintain the room at a positive pressure in order to prevent the inflow of contaminated air from the outside. Therefore precisely chambers R _1, R ₂ in order to control the chamber pressure, ... variable air volume system VAV _1, VAV ₂ to R _10, ... VAV ₁₀ is installed. Wherein each chamber R _1, R _2, ... variable air volume system VAV ₁ installed in the exhaust duct of R _10, VAV _2, ... VA
Exhaust motor-damping MD ₂ so as to maintain the minimum discharge amount and the minimum of the outside air intake amount based on the operating state of the V _10, the exhaust fan F _2, by operating the outside air motor-damping MD ₁ and the air supply fan F _1, the exhaust fan a control for reducing the conveyance force of F _2.

[0023] To reduce the exhaust fan conveying power, emissions of the largest room, that each chamber _{R 1, R 2, ... R} 10
Variable air volume devices VAV ₁ , VAV attached to
_2, ... find the room opening the largest variable air volume system in VAV _10, the variable air volume system operates the opening degree of the exhaust gas motor-damping MD ₂ or outside air motor-damping MD ₁ so as to fully open. Note that the operation of the exhaust motor-damping MD ₂ opening, exhaust motor-damping MD ₂ and the exhaust fan F ₂
Means a control of the exhaust amount in combination with, the operation of the opening degree of the external air motor-damping MD _1, the outside air motor-damping M
This means the control of the outside air intake amount by the combination of D ₁ and the air supply fan F ₁ . FIG. 7 shows the cooperation between the outside air motor damper MD ₁ , the exhaust motor damper MD ₂ , the air supply fan F ₁ , and the exhaust fan F ₂ with respect to the exhaust amount and the outside air intake amount. In Figure 7, OAφ outside air motor-damping MD ₁ and the air supply fan F ₁ represents the outside-air intake capacity when the coordination, EAfai exhaust motor-damping MD ₂ and the exhaust fan F ₂
Represents the exhaust capacity when cooperating.

As shown in the control rule table 2 in FIG. 4, the control operation is represented by the following basic rule (rule: Rule). [Rule 1] Variable air volume devices VAV ₁ , VAV ₂ ,.
One is fully opened out the AV _10, are becoming closed its variable air volume system, an exhaust motor-damping MD ₂ is if fully closed, opening the outside air motor-damping MD _1.

[Rule 2] Variable air volume devices VAV ₁ , V
If one of AV ₂ ,... VAV ₁₀ is fully open and its variable air volume device is closing and the exhaust motor damper MD ₂ is not fully closed, the exhaust motor damper MD ₂ is closed.

[Rule 3] Variable air volume devices VAV ₁ , V
If one of the AV ₂ ,... VAV ₁₀ is fully open and the variable air volume device is not operated, the exhaust motor damper MD ₂
Even outside air motor-damping MD ₁ also does nothing.

[Rule 4] Variable air volume devices VAV ₁ , V
If one of AV ₂ ,... VAV ₁₀ is fully open and its variable air volume device is opening and the exhaust motor damper MD ₂ is fully open, the outside air motor damper MD ₁ is closed.

[Rule 5] Variable air volume devices VAV ₁ , V
If one of the AV ₂ ,... VAV ₁₀ is fully open and the variable air volume device is opening, and the exhaust motor damper MD ₂ is not fully open, the exhaust motor damper MD ₂ is opened.

[Rule 6] All variable air volume devices VAV
_1, VAV _2, ... not a VAV ₁₀ is fully open, if the exhaust motor-damping MD ₂ is fully closed, the outside air motor-damping MD ₁
Open.

[Rule 7] All variable air volume devices VAV
_1, VAV _2, ... not a VAV ₁₀ is fully open, the exhaust motor-damping MD ₂ is not the fully closed, exhaust motor-damping MD
Close ₂ .

The control algorithm is shown below in steps. [Step 1] Each control target room (experimental animal breeding room R ₁ ,
R ₂ ,... R ₁₀ )
Among the V ₁ , VAV ₂ ,... VAV _10, a variable air volume device having the largest opening is found.

[Step 2] The current opening of the variable air volume device found in [Step 1] is obtained. [Step 3] obtaining the current degree of opening of the exhaust motor-damping MD _2.

[Step 4] Fuzzy inference is performed using the prepared rules (see control rule table 2). [Step 5] determines the decreasing manipulated variable of the outside air motor-damping MD ₁ or the exhaust motor-damping MD _2.

[0034] [Step 6] adds the decreasing manipulated variable to the operation amount of the current outside air motor-damping MD ₁ or the exhaust motor-damping MD _2. [Step 7] [Step 1] to [Step 6]
repeat.

FIG. 5 shows a form of fuzzy inference of the control for reducing the power for transporting the exhaust fan in the room pressure / temperature / humidity control of the experimental animal breeding room. In the figure, S represents the previous (current) control deviation (at (t-1)) and the current control deviation ((t)).
), That is, an operator for calculating a change in control deviation.

The control inference mechanism for reducing the exhaust fan conveyance power is composed of two blocks. That is, to deduce the decreasing manipulated variable of the outside air motor-damping MD ₁ or the exhaust motor-damping MD ₂ a variable air volume system opening from the exhaust motor-damping MD _2. Inference block, outside air motor-damping MD ₁ operation amount fuzzy inference, composed of an exhaust motor-damping MD ₂ operation amount fuzzy inference. Note that the operation of the opening degree of the exhaust gas motor-damping MD _2, the exhaust motor-damping MD ₂ and means to control the exhaust amount in combination with exhaust fans F _2, of the operation of the opening degree of the external air motor-damping MD _1, the outside air motor-damping MD It means the control of the quantity introduced outside air in combination with ₁ and air supply fan F _1.

Variable air volume devices VAV ₁ , VAV ₂ ,... VA
Maximum opening and the current exhaust motor-damping MD ₂ operation amount EAφ outside air motor-damping MD ₁ decreasing manipulated variable of the current from the (t-1) dOAφ (t ) and the exhaust motor-damping MD ₂ decreasing manipulated variable of the current (last) of the V ₁₀ Infer dEAφ (t). The external air motor damper MD ₁ this time increase / decrease operation amount dO
Aφ outside air motor-damping MD ₁ operation amount and OAφ (t-1) of this is added to the air motor-damping MD ₁ operation amount OAfai (t), the current exhaust motor-damping MD ₂ decreasing manipulated variable of (t) of the current (last) dEAφ (t) the current exhaust of the (previous) motor-damping MD ₂ operation amount EAφ (t-1)
Exhaust of this time is added to the motor-damping MD ₂ operation amount EAφ
(T).

As described above, in the blower temperature drive control, the reheater (variable temperature device) installed in each controlled room
Know the state of sensible heat load of each room from the opening state of the hot water valve for use,
The blast temperature is controlled sequentially based on the information. As a result, waste of reheating is reduced, energy can be saved, and the effect is improved from the economical aspect. In the control for reducing the exhaust fan conveyance power, the load on the VAV generated for controlling the room pressure is known by knowing the opening degree of the VAV installed in each control target room, and this is reduced. Therefore, the exhaust damper and the outside air damper are controlled. As a result, the load on the VAV can be reduced, and the power for conveying the exhaust fan can be reduced at the same time, which is effective for energy saving and economy.

[0039]

As described above, according to the present invention, the load on the variable air volume device can be reduced, and the power for transporting the exhaust fan can be reduced at the same time, which is effective for energy saving and economy. Can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a control rule table 1 used for blowing air temperature drive control according to the present invention.

FIG. 3 is an explanatory diagram showing an example of a fuzzy inference mode of air blowing temperature drive control and temperature / humidity control according to the present invention.

FIG. 4 is an explanatory diagram showing an example of a control rule table 2 used for control for reducing the exhaust fan conveyance power according to the present invention.

FIG. 5 is an explanatory diagram showing an example of a fuzzy inference form of control for reducing the exhaust fan conveyance power according to the present invention.

FIG. 6 is a configuration explanatory view showing a conventional dew point temperature control system.

FIG. 7 is a characteristic diagram showing an example of a relationship between an exhaust air motor damper and an exhaust air fan with respect to an exhaust amount and an external air intake amount of control for reducing exhaust fan conveyance power according to the present invention.

[Explanation of symbols]

11 ... air conditioner 12 ... cooling coils 13 ... heating coil 14 ... steam spray CV ... cold water valve _{HV, HV 1, HV 2,} ... HV 10 ... hot water valve SV ... humidifier valve MD ₁ ... outdoor air motor-damping MD ₂ ... exhaust motor-damping F ₁ ... air supply fan F ₂ ... exhaust fan T _s ... air conditioner outlet temperature detecting unit _{RH 1, RH 2, ... RH} 10 ... Rehita _{R 1, R 2, ... R} 10 ... experimental animal room T _1, T _2, ... T ₁₀ ... indoor temperature detection unit _{H 1, H 2, ... H} 10 ... indoor humidity detecting unit _{dP 1, dP 2, ... dP} 10 ... chamber pressure detecting unit _{VAV 1, VAV 2, ... VAV} 10 ... variable air volume system

────────────────────────────────────────────────── (5) References JP-A-6-159770 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 11/02 102

Claims (2)

(57) [Claims] 1. An air conditioner in which outside air is taken in and temperature and humidity are controlled, a plurality of control target rooms supplied from the air conditioner via corresponding variable temperature devices, and a plurality of control target rooms. Temperature control means for controlling the temperature of air supply from the air conditioner to the control target room so that the amount of temperature change of the variable temperature device corresponding to the control target room having the largest sensible heat load is minimized. An air conditioning system characterized by the following. 2. The air conditioning system according to claim 1, wherein each of the plurality of control target chambers corresponds to an exhaust outlet side.
Controlling a variable air volume system, which is connected, the exhaust volume or ambient air inlet amount as air volume change amount is the largest of the variable air volume system corresponding to the largest control target chamber of an exhaust quantity of the plurality of control target chamber Te An air conditioning system comprising an air volume control unit.