JPH0875297A - Air conditioning apparatus using absorption refrigerator - Google Patents

Abstract

PURPOSE: To favorably control a pressure of a condenser, even in the case where a previously designed optimum regulator cannot control a temperature of the condenser suitably, by replacing weight matrices by other weighing matrices when it is judged that a temperature of a condenser is not suitably controlled. CONSTITUTION: An optimum regulator, which minimizes an evaluation function on the basis of weight matrices Q1 and R1 normally stored in first storage means 7 at the time of shipment, is designed by design means 26 to find feedback gains F1 and F2 . A temperature of a condenser 16 is measured after a predetermined period of time elapses from a start-up of operation. When a measured value and an essential target value are compared with each other, and there is a deviation therebetween more than a predetermined value, it is judged that a temperature of the condenser 16 remains high and cooling is not adequately performed, and then conversion means 29 reads weight matrices Q2 and R2 from second storage means 8 to replace the weight matrices Q1 and R1 of the design means 26 by the second weight matrices Q2 and R2 .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using an absorption refrigerating machine for general houses and small buildings.

[0002]

2. Description of the Related Art An air conditioner using an absorption refrigerator is currently used for industrial purposes such as factories, buildings or large stores.
Mainly used for commercial equipment.

In a cooling system of an air conditioner using an absorption refrigerator, a refrigerant vapor evaporated in a regenerator is condensed in a water-cooled condenser, and the condensed refrigerant is guided to an evaporator for evaporation. The cooling heat medium (usually water) that circulates between the fan coil unit provided in the room to be cooled and the refrigerator is cooled by the latent heat of vaporization at that time. On the other hand, the evaporated refrigerant vapor is operated in a cycle in which a water-cooled absorber absorbs the concentrated solution (absorption liquid) and returns it to the regenerator.

In an air conditioner using this type of absorption refrigerator, the temperature of the cold heat medium circulated in the indoor fan coil unit is cooled to around 7 ° C. in the evaporator, and the cold heat medium is circulated in the indoor fan coil. It is circulated to cool the indoor air and return it to the evaporator at around 12 ° C. When using an aqueous lithium bromide solution as the absorbing liquid, it is necessary to maintain the temperature of the absorbing liquid in the absorber at around 40 ° C. To maintain this temperature, a cooling tower is installed on the rooftop or the like, and the water cooling circuit is installed. The method of cooling is adopted.

However, the conventional air conditioner using the absorption type refrigerating machine adopting such a water cooling system has the following problems.

(1) Since the temperature of the absorber is controlled by a water cooling system, the equipment becomes large and piping is required. Therefore, a lot of construction cost is required, which is a problem for general houses and small buildings. Not suitable for cooling.

(2) Since it is necessary to connect the fan coil unit and the refrigerator in the room to be cooled by the pipe for circulating the heating / cooling medium, the construction cost and equipment cost are high. The same applies to an ammonia absorption refrigerator that uses ammonia water as the absorbing liquid and the refrigerant.

Therefore, the present inventors carry out a cooling cycle operation in which the condenser and the absorber are cooled by an air cooling method instead of a water cooling method, and the air to be cooled is directly passed through an evaporator instead of using a cooling / heating medium. Proposing an air conditioner (Japanese Patent Application No. 5)
22351).

FIG. 5 shows a main part of a modified example of an air conditioner using the single-effect absorption refrigerator proposed in the above application, and FIG. 6 shows an installed state of the air conditioner.

As shown in FIG. 6, the air conditioner includes an outdoor unit 1
The outdoor unit 1 is arranged outside the room 5 of the house to be air-conditioned with the configuration shown in FIG. 5, and the indoor unit 2 has only the outlet for cool air and the inlet for indoor air. It has and is arranged inside the chamber 5. The outdoor unit 1 and the indoor unit 2 are connected by a blower duct 3 for cold air and an intake duct 4 for indoor air. Reference numeral 6 is a remote controller for starting or stopping the operation of the apparatus, setting or canceling the automatic operation, setting the room temperature, adjusting the amount of blown cold air, and the like.

The inside of the outdoor unit 1 is constructed as shown in FIG. 5, in which an aqueous lithium bromide solution is used as the absorbing liquid and water is used as the refrigerant.

The evaporator 10 has a function of evaporating a refrigerant and cooling the air passing therethrough by the latent heat of evaporation thereof.
It is connected to the blower duct 3 and the intake duct 4. A blower fan 11 is provided in the intake duct 4.

The regenerator 12 has the functions of absorbing the refrigerant and heating the absorbent having a low concentration by the burner 13 to generate refrigerant vapor and to concentrate the absorbent. Fuel gas is supplied to the burner 13 from a fuel supply pipe 14, and the degree of combustion is adjusted by the opening degree of the fuel supply control valve 15.

The condenser 16 has a function of cooling the refrigerant vapor sent from the regenerator 12 by the air cooling fan 17 and liquefying it, and a part of the refrigerant is used as a refrigerant in order to adjust the average concentration of the circulating solution. Store in the tank 18.

The absorber 20 stores the absorbing liquid, has a function of absorbing the refrigerant evaporated in the evaporator 10 into the absorbing liquid, and is cooled by the same air cooling fan 17 as the condenser 16. The absorbing liquid which has absorbed the refrigerant and has a low concentration is temporarily stored in the dilute solution tank 21.

Reference numeral 22 denotes the regenerator 12 from the dilute solution tank 21.
The heat exchanger 23, which performs heat exchange between the low-temperature and high-concentration absorption liquid flowing from the regenerator 12 and the high-concentration high-temperature absorption liquid toward the absorber 20, absorbs the refrigerant to reduce the concentration. A pump for sending the absorbed liquid from the dilute solution tank 21 to the regenerator 12, and 24 are the upstream side of the evaporator 10 and the condenser 16
Is a pressure loss member such as a capillary provided between the pressure loss member and the downstream side.

All of V1, V2, V3, V4 and V5 are control valves such as solenoid valves, and in particular V4 has a non-return function of not flowing the dilute solution from the dilute solution tank 21 side to the refrigerant tank 18 side. It is a valve.

The above-mentioned air conditioner basically controls each container by controlling the temperature of each container except that the pump 23 is used to deliver the absorbing solution from the dilute solution tank 21 to the regenerator 12. A pressure difference is created between them, and the refrigerant and the absorbing liquid are sent and circulated by the pressure difference.

In this type of air conditioner, even when the operating condition is changed by a user's instruction or the operating condition is changed due to temperature change of the outside air, etc., it is smooth and stable depending on the situation at that time. The continued operation is required. Stable circulation of the refrigerant under various conditions in the absorption refrigerating machine is also one means for achieving this requirement.

In an air conditioner of a system in which a pump is used only for supplying a dilute solution to a regenerator, and the circulation of the refrigerant itself is performed by the pressure difference in each part of the apparatus, the stable circulation of the refrigerant depending on the situation is performed. In order to maintain stable cooling capacity, it is necessary to adjust the pressure of the condenser so as to maintain a predetermined pressure difference with respect to the evaporator having a preset pressure. Since the pressure of the condenser depends on the temperature of the condenser, the pressure of the condenser can be adjusted by adjusting the temperature of the condenser.

Therefore, the present inventors controlled the motor speed of the air-cooling fan for cooling the condenser in accordance with the temperature of the condenser, so that the liquefied refrigerant was stably sent from the condenser to the evaporator and stabilized. An air conditioner capable of exhibiting cooling ability is proposed (Japanese Patent Application No. 5-264296).

[0022]

By the way, in the above air conditioner, if the PID control method which is well known in the related art is used to control the motor speed of the air-cooling fan for cooling the condenser, it is a disturbance. The controllability may decrease due to fluctuations in the gas input depending on the outside air temperature and the opening of the fuel supply control valve.

Therefore, it is conceivable to use modern control in order to cope with various load fluctuations. However, in modern control, a certain condition, for example, the outside air temperature of the place where the device is installed is assumed in advance, and control is performed using a so-called optimum regulator so that the most appropriate control can be performed under the assumed condition. Therefore, when the installation conditions of the device are different or a device difference occurs, there is a problem that the optimal regulator designed in advance does not perform appropriate control and the temperature of the condenser cannot be controlled to the target temperature.

The present invention has been made in view of the above points. Even if a condition in which a condenser temperature cannot be properly controlled by a pre-designed optimum regulator for modern control due to different installation conditions of an air conditioner, It is an object of the present invention to provide an air conditioner using an absorption refrigerating machine that can appropriately control the pressure of a condenser by appropriately rotating an air cooling fan.

[0025]

In order to achieve the above object, the present invention provides an evaporator for evaporating a refrigerant, an absorption liquid for absorbing the refrigerant, and a refrigerant vapor evaporated in the evaporator for the absorption liquid. An absorber for absorbing, a regenerator for generating a refrigerant vapor and a concentrated absorbent by heating a rare absorbent that has absorbed the refrigerant vapor, and a condenser for condensing the refrigerant vapor generated by the regenerator, A refrigerant is sent from the condenser to the evaporator due to a pressure difference between the condenser and the evaporator, and the air in the room to be conditioned is directly cooled by the evaporator, and the cooled air is supplied to the room through a duct. In an air conditioner using an absorption refrigerator that cools the condenser by blowing air into the air, an air cooling fan that cools the condenser, an outside air temperature detecting unit that detects the outside air temperature, and a gas that burns with a burner that heats the regenerator. Amount of gas imp Gas input detection means for detecting as the temperature, condenser temperature detection means for detecting the temperature of the condenser, under predetermined assumed conditions, the rotation speed of the air cooling fan, the outside air temperature and the gas input, Design means for designing an optimum regulator using the condenser temperature as an output, first storage means for storing a first weight matrix in an evaluation function for designing the optimum regulator, and the condensing under the assumed conditions. Temperature storage means for storing an appropriate refrigerant temperature of the container, second storage means for storing a second weight matrix, and calculation means for calculating an optimum air-cooling fan rotation speed from the optimum regulator designed by the design means. The temperature of the condenser is compared with the appropriate temperature of the temperature storage means, and when it is determined that the temperature is not properly controlled, the weight of the design means is And changing means for changing the matrix from a first weight matrix to a second weight matrix, and constitute air conditioner and a cooling fan driving means for driving the cooling fan at a rotational speed that is calculated by said calculating means.

[0026]

First, the optimum regulator is designed by evaluating the evaluation function of the first weight matrix, and the air-cooling fan is controlled by the control by the optimum regulator. Therefore, in normal use in the same range as the assumed state, the condenser temperature is appropriately controlled by the air cooling fan.

On the other hand, when the actual operating state is different from the initially expected condition due to some cause such as instrumental error or installation condition, the optimum regulator designed using the evaluation function of the first weighting matrix is properly controlled. For example, the condenser temperature does not reach the predetermined temperature within the predetermined time.
Then, the weight matrix of the design means is changed to the second weight matrix, and a new optimum regulator is designed based on this. Therefore, by setting the second weighting matrix so that an appropriate state can be created under other conditions, the transient characteristics, energy consumption, etc. are set to optimum values for the device, and the air-cooling fan is set appropriately. Controlled by
The condenser temperature is controlled to the target temperature.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an essential part of an embodiment of an air conditioner using a single-effect absorption refrigerator according to the present invention. The installation state of the air conditioner according to the present invention is as shown in FIG.

Since the basic construction of the air conditioner according to the present invention is the same as that shown in FIG. 5, the description thereof will be omitted, and an electric circuit necessary for controlling the equipment will be mainly described.

T1 is a temperature sensor for detecting the room temperature provided on the upstream side of the evaporator 10, T2 is a temperature sensor for detecting the blowing temperature, T3 is a level sensor for detecting the liquid level of the regenerator, and T4 is a condenser. Temperature sensor for detecting the outlet temperature of the vessel, T
Reference numeral 5 is a temperature sensor for detecting the outside air temperature.

The air conditioner includes a controller 30 including a CPU, a memory and a drive circuit, and a remote controller 6 (see FIG. 6).
Receiving the setting signal from the reference unit) in the receiving unit 2a of the indoor unit 2,
A communication controller 31 that receives a signal from the receiver 2a is provided, and the controller 30 includes temperature sensors T1 and T2.
2, T4, T5 and the signals from the level sensor T3,
Upon receiving a signal from the communication controller 31, the blower fan 11,
The operations of the air cooling fan 17, the pump 23, and the fuel supply control valve 15 are controlled.

Further, the controller 30 has a design means 26 for designing an optimum regulator as shown in FIG. 1, a calculation means 27 for calculating the rotation speed of the air cooling fan 17 with the designed optimum regulator, and a drive for driving the air cooling fan 17. Means 28, a first storage means 7 for storing the _first weight matrix Q ₁ and R ₁ , a second storage means 8 for storing the _second weight matrix Q ₂ and R ₂ , and an appropriate temperature under a predetermined assumed condition. Temperature storing means 37 for storing, temperature detecting means 38 connected to the sensor T4 to detect the temperature of the condenser 16, and temperature detecting means 38.
Compares the temperature of the condenser 16 detected by the controller with the proper temperature, and when it determines that the condenser 16 is not properly controlled, the second storage means 8 is connected to the design means 26 instead of the first storage means 7. And changing means 29.

Here, the first weighting matrices Q ₁ and R ₁
Is a weighting matrix of the evaluation function that is set assuming a certain actual condition, and the optimal regulator evaluated by this weighting matrix enables optimal control under that condition. ing.

The second weighting matrices Q ₂ and R ₂ are the first weighting matrix Q ₁ with an emphasis on reducing energy consumption.
And for R ₁ , increase the value of Q (or R
Is a weight matrix that emphasizes the improvement of transient characteristics.

In addition to the weighting matrices Q ₂ and R ₂ , a plurality of sets of weighting matrices having different values of Q and R may be stored in the second storage means 8. At this time, a plurality of sets of weighting matrices may be stored. The weighting matrix is appropriately selected by the changing unit 29 and sent to the designing unit 26. Further, the first storage means 7 and the like for storing these weighting matrices Q and R in advance may be a non-volatile memory (for example, ROM) in which the stored contents are not lost even when the air conditioner is not powered. preferable.

Next, the operation of the cooling cycle will be described with reference to FIG.

Before the start of operation, the valves V1, V3 and V5 are closed and the valves V2 and V4 are open. All the absorbing liquid is contained in the dilute solution tank 21, and the regenerator 12 is empty.

When the start button of the remote controller 6 is turned on, the valves V1, V3, V5 are opened and the valves V2, V are opened.
4 is closed (F-1), the motor M ₂ is driven and the pump 2
The absorption liquid is sent from the dilute solution tank 21 to the regenerator 12 by 3 (F-2). At this time, C in the controller 30
The PU judges whether or not the liquid level of the regenerator 12 has reached a specified level by looking at the signal from the level sensor T3 (F
-3). When the liquid level reaches a prescribed level, the fuel supply control valve 15 is opened to supply the fuel gas from the fuel supply pipe 14 to ignite the burner 13 (F-4).

Refrigerant vapor is generated in the regenerator 12 and the condenser 16
The temperature of the condenser 16 gradually rises due to the temperature of the refrigerant vapor. The CPU in the controller 30 determines whether or not the temperature of the condenser 16 has reached a predetermined value based on a signal from the temperature sensor T4 (F-5). When the temperature has reached the predetermined value, the air cooling fan 17 is driven by the motor M _1. Rotate (F-
6).

In the condenser 16, the vapor refrigerant sent from the regenerator 12 is liquefied, and this liquefied refrigerant flows into the refrigerant tank 18 via the valve V5. At this time, the CPU in the controller 30 determines whether or not the refrigerant in the refrigerant tank 18 has reached a predetermined amount (F-7). When the predetermined amount is reached, the valve V5 is closed (F-8) and air is blown. The fan 11 is rotated (F-9).

At this time, the refrigerant from the condenser 16 flows into the evaporator 10 through the capillary 24, the refrigerant is evaporated in the evaporator 10, and the latent heat is sent from the room through the intake duct 4 by the blower fan 11. Cool the air. The cooled air is sent to the indoor unit 2 through the air duct 3 and is blown into the room 5 as cold air to cool the room 5 (F-10).

In this cooling operation, the refrigerant evaporated into vapor in the evaporator 10 flows into the absorber 20 where it is absorbed by the absorbing liquid. The absorbing liquid, which has absorbed the refrigerant and becomes low in concentration, once enters the dilute solution tank 21 and is then pumped by the pump
As a result, the heat is exchanged with the high-concentration high-temperature absorption liquid sent from the regenerator 12 by the heat exchanger 22 through the valve V3, and is sent to the regenerator 12. This state is the steady mode of operation.

When the start button of the remote controller 6 is turned off (F-11), the stop process is performed (F-12), and then the process ends. As the stopping process, first, the burner 13 is extinguished, the valves V2 and V4 are opened, and the valve V1 is closed. Then, after a while, the pump 23 is stopped, the valve V3 is closed, and the blower fan 11 and the air cooling fan 17 are stopped. By doing so, the refrigerant in the refrigerant tank 18 and the regenerator 1
The absorbing liquid in 2 all flows into the dilute solution tank 21. This is the refrigerant tank 1 due to the absorbing liquid while the device is stopped.
This is to prevent the 8 and the regenerator 12 from corroding and to dilute the concentrated solution to prevent crystallization.

Next, in an air conditioner using an absorption refrigerator,
The control according to the present invention for continuing the smooth and stable operation according to the situation at each time will be described.

In this embodiment, first, when creating a model of a servo system for controlling the outlet temperature of the condenser 16,
A motor M for rotating the air-cooling fan 17 and the amount of supply gas (hereinafter referred to as “gas input”) according to the outside air temperature detected by the temperature sensor T5, the opening degree of the fuel supply control valve 15
The rotation speed of ₁ is input, and the outlet temperature of the condenser 16 detected by the temperature sensor T4 is modeled as an output. An example of this model is shown in Equation 1.

[0047]

[Equation 1] y (t) + a ₁・ y (t-1) + a ₂・ y (t-2) = b ₀・ u _b (t) + b ₁・ u _b (t-1) + b _{2 · u b (t-2} ) + c 0 · u c (t) + c 1 · u c (t-1) + c 2 · u c (t-2) + d 0 · u d (t) + in _{d 1 · u d (t-} 1) + d 2 · u d (t-2) number _{1, u b (t),} u c (t), u d (t)
Are inputs corresponding to the outside air temperature, gas input, and air cooling fan speed, respectively, y (t) is an output corresponding to the condenser outlet temperature, and t is the time when sampling is performed in time series. This is the sample number. The model order is quadratic.

These input / output values are obtained by assuming the environment of the place where the air conditioner is installed, experimentally creating the environment, operating the air conditioner, and actually measuring each value at predetermined time intervals. You can

Equation 1 is an ARX model in which the system delay is zero. Here, the ARX model is a discrete value type model that assumes that the input and output of the system to be controlled have a time-series relationship as shown in Equation 1.

Next, by converting the time series model of equation 1 into a matrix expression (state space type), the state equation of equation 2 and the output equation of equation 3 are established.

[0051]

[Formula 2] X (t + 1) = A · X (t) + B · U (t)

[0052]

## EQU3 ## Y (t) = C.X (t) + D.U (t) In Equations 2 and 3, U (t) is an input, Y (t) is an output, and X (t) is a state variable. is there.

Input U (t) in the equations 2 and 3
(In this embodiment, the outside air temperature, the gas input, and the air-cooling fan rotation speed are combined into one matrix), the output Y (t) (the condenser outlet temperature in this embodiment) and X (1) are Once obtained, the coefficients A, B, C, D of the above state equation and output equation can be calculated. In this way, calculating the coefficients A, B, C, and D and formulating the relationship between the input and the output is called system identification.

FIG. 4 is a state variable diagram of the servo system of the air conditioner according to the present invention, which is modeled as the equations 1 to 3.

In FIG. 4, reference numeral 35 is a servo system to be controlled, and 36 is a CP in the controller 30 shown in FIG.
It is an additional integrator realized by U. Further, u (k) is the rotation speed of the air-cooling fan that is an input to the controlled object, x (k) is a state variable, and y (k) is the condenser 1 measured by the temperature sensor T4.
6 is the outlet temperature, r (k) is the target value of the outlet temperature of the condenser 16, e (k) is the difference between the target value of the outlet temperature of the condenser 16 and the measured value, and z (k) is It is the integral value of the difference obtained by subtracting the measured value from the target value of the temperature at the outlet of the condenser 16.

In order to realize the control of the state variable diagram shown in FIG. 4, it is necessary to find the feedback gains F ₁ and F ₂ . Therefore, next, how to obtain the feedback gains F ₁ and F ₂ will be described.

The feedback gains F ₁ and F ₂ are
It is obtained by evaluating the equation of state of Equation 2 and finding the optimum solution. Equation 4 is a quadratic form evaluation function that is an index for this evaluation.

[0058]

[Equation 4] Optimal control is to determine the control input U so as to minimize the value J of the evaluation function shown in the equation 4, and the feedback gains F ₁ and F ₂ can be obtained by obtaining the control input U.
Can be requested.

In equation 4, X ^T and U ^T are transposed matrices of matrices X and U, respectively, and Q and R are
It is a weighting matrix that is predetermined based on the quick response required for the system, the input limitation, and the like. The weight matrices Q and R are stored in the first storage means 7 or the like, and the weight matrix Q is stored.
Is a non-negative definite (Q ≧ 0) and R is a positive definite (R> 0) symmetric matrix. An increase in the weight matrix Q increases the responsiveness of X, and an increase in the weight matrix R decreases the control input U. . That is,
Reducing the evaluation function J requires contradictory contents as a control method of reducing energy consumption and improving transient characteristics.

Then, the number of rotations of the air cooling fan is obtained by the equation 5, and the temperature of the outlet of the condenser 16 is controlled by rotating the air cooling fan 17 at this number of rotations.

[0061]

(Equation 5) In Equation 5, (r (t) -y (t)) is the condenser 1
It is the difference obtained by subtracting the measured value from the target value of the temperature at the outlet of 6, that is, e (t).

Next, the characteristic operation of the air conditioner of this embodiment will be described.

[0063] First, usually, optimal regulator which minimizes the evaluation function J based on the first storage unit 7 weights stored in the matrices Q ₁ and R ₁ are designed by the design unit 26 at the time of shipment, the feedback gain F ₁ and F ₂ are required. In the present embodiment, in the output equation of Equation 3, C = [1,0], D = 0, X (1) was set to an appropriate value, and the feedback gains F ₁ and F ₂ were obtained. The calculating means 27 calculates the optimum air-cooling fan capacity based on the obtained feedback gains F ₁ and F ₂ , and the air-cooling fan 17 rotates at the rotation speed obtained by the calculation, so that the temperature at the outlet of the condenser 16 is appropriate. The air conditioner is controlled by the optimum regulator.

However, in the case where there is a device difference between the device actually installed and the device assumed at the design stage in advance, or when the condition of the installation place is largely different from the condition originally assumed, the condenser temperature May not be properly controlled to the target temperature. As described above, since the weighting matrices Q ₁ and R ₁ are defined with an emphasis on reducing the energy consumption, the control by the feedback gains F ₁ and F ₂ obtained from the weighting matrices Q ₁ and R ₁ is actually necessary. This is because there is a case where the calculated capacity is insufficient from the air-cooling fan capacity to be performed and the cooling cannot be sufficiently performed.

The control in such a case will be described below.

The temperature of the condenser 16 is measured after a lapse of a certain time from the start of operation. Then, the measured value is compared with the original target temperature, and when there is a deviation of a predetermined value or more between them (measured value> target temperature), the condenser 16
It is determined that the temperature is still high and the cooling is not sufficient, and the conversion unit 29 reads the weight matrices Q ₂ and R ₂ from the second storage unit 8 and the first weight matrix Q of the design unit 26.
Replace ₁ and R ₁ with a second weighting matrix Q ₂ and R ₂ .

The design means 26 evaluates based on the changed second weighting matrices Q ₂ and R ₂ and newly designs an optimum regulator. Second weight matrix Q ₂ and R
_{Since 2} is a weight matrix (Q ₂ > Q ₁ ) that emphasizes transient characteristics, an air-cooling fan is used in the optimum regulator designed by evaluating the evaluation function using the second weight matrices Q ₂ and R ₂ as weight matrices. The number of revolutions of 17 increases, and therefore
The condenser 16 is sufficiently cooled and can be properly controlled.

On the other hand, although the target temperature is reached, the calculated value is higher than the actually required rotation speed of the air-cooling fan 17,
Energy consumption may be determined to be too high.
This can be determined by the fact that the integrated value of the capacity of the air-cooling fan 17 until the temperature of the condenser 16 reaches the target temperature becomes a predetermined value or more (that is, when the energy consumption of the air-cooling fan 17 is a certain value or more). .

At this time, the weighting matrix of the design means 26 is changed to the weighting matrices Q ₃ and R _{3 in} which the value of R is reduced. By reducing the value of R, the weighting matrices Q ₃ and R ₃ are weighting matrices with an emphasis on reduction of energy consumption, and the weighting matrices Q ₃ and R ₃ are used as the evaluation function. For example, it is possible to appropriately suppress the rotation capacity of the air-cooling fan 17, have high energy consumption characteristics, and perform appropriate control without waste.

As described above, according to the air conditioner of this embodiment, when it is determined that the temperature of the condenser 16 is not properly controlled, the weighting matrices Q and R of the design means 26 are set.
Therefore, the optimum regulator can be newly designed in conformity with each device having different installation conditions and states of the air conditioner, and proper control can always be maintained.

Although the optimum regulator is designed by using the ARX model in this embodiment, it may be calculated by the least square method or the prediction error method using other models.

Further, in the present embodiment, the lithium bromide aqueous solution was used as the absorbing liquid and water was used as the refrigerant. However, the present invention is not limited to this, and can be applied to the case where ammonia is used as the refrigerant. .

[0073]

According to the air conditioner of the present invention, when it is determined that the temperature of the condenser is not properly controlled, the weight matrix is changed to another weight matrix. It is possible to newly design an optimum regulator suitable for each device with different characteristics, and change the optimum regulator according to the actual installation conditions of each device to optimize the transient characteristics and energy consumption. After setting, the air cooling fan capacity can be appropriately controlled to bring the temperature of the condenser close to the target temperature, and good controllability can be obtained.
Moreover, it is possible to provide an air conditioner using an absorption refrigerator that is resistant to disturbance and the like.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of an embodiment of an air conditioner according to the present invention.

FIG. 2 is a block diagram of a main part of an embodiment of an air conditioner according to the present invention.

FIG. 3 shows a flow chart of a steady mode of operation of an air conditioner according to the present invention.

FIG. 4 is a state variable diagram of a servo system of an air conditioner according to the present invention, which is modeled as Equations 1 to 3.

FIG. 5 is a block diagram of a main part of a modified example of an air conditioner using a single-effect absorption refrigerating machine proposed in the prior application.

FIG. 6 shows an installation state of the air conditioner shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Indoor unit 3 Blower duct 4 Intake duct 5 Chamber 6 Remote controller 7 First storage unit 8 Second storage unit 10 Evaporator 11 Blower fan 12 Regenerator 13 Burner 14 Fuel supply pipe 15 Fuel supply control valve 16 Condensation 17 Air cooling fan 18 Refrigerant tank 20 Absorber 21 Dilute solution tank 26 Design means 27 Computing means 28 Driving means 30 Controller 31 Communication controller 37 Temperature storage means 38 Temperature detecting means T1, T2, T4, T5 Temperature sensor T3 Level sensor V1 , V2, V3, V4, V5 valve M _1, M ₂ motor

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[Procedure amendment]

[Submission date] October 21, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0061

[Correction method] Change

[Correction content]

[0061]

(Equation 5) In Equation 5, (r (k) -y (k)) is the condenser 1
It is the difference obtained by subtracting the measured value from the target value of the outlet temperature of No. 6, that is, e (k).

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

FIG. 6 shows an installation state of the air conditioner shown in FIG.

Claims (3)

[Claims] 1. An evaporator that evaporates a refrigerant, an absorber that stores an absorption liquid that absorbs the refrigerant and that absorbs the refrigerant vapor that has evaporated in the evaporator, and a rare absorption liquid that absorbs the refrigerant vapor. And a condenser for condensing the refrigerant vapor generated in the regenerator, and a regenerator for generating a refrigerant vapor and a concentrated absorbent, and a condenser for condensing the refrigerant vapor generated in the regenerator. An air conditioner using an absorption refrigerating machine that sends a refrigerant to the evaporator, directly cools the air in the room to be air-conditioned by the evaporator, and blows the cooled air into the room through a duct for cooling. A cooling fan for cooling the condenser, an outside air temperature detecting means for detecting an outside air temperature, a gas input detecting means for detecting an amount of gas burned by a burner for heating the regenerator as a gas input, the condensing And a condenser temperature detecting means for detecting the temperature of the air conditioner, and under a predetermined assumed condition, the rotation speed of the air cooling fan, the outside air temperature and the gas input are input, and the condenser temperature is output, and an optimum regulator is designed. Design means, temperature storage means for storing an appropriate temperature of the condenser under the assumed conditions, and a first evaluation function for designing the optimum regulator.
A first storage means for storing the weight matrix of No. 2, a second storage means for storing the second weight matrix, and an operation means for calculating the optimum air-cooling fan rotation speed from the optimum regulator designed by the design means, When the temperature of the condenser is compared with the proper temperature of the temperature storage means, and when it is determined that the condenser temperature is not properly controlled, the weight matrix of the design means is changed from the first weight matrix to the first weight matrix. An air conditioner comprising: a changing unit that changes to a weight matrix of 2; and an air-cooling fan drive unit that drives the air-cooling fan at the rotation speed calculated by the calculation unit. 2. The air conditioner according to claim 1, wherein the condenser temperature detecting means detects a temperature at an outlet of the condenser. 3. The air conditioner according to claim 1, wherein the first storage means and the second storage means are non-volatile storage means.