JP3124685B2 - Air conditioner using absorption refrigerator - Google Patents

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 refrigerator for general houses and small buildings.

[0002]

2. Description of the Related Art Air conditioners using absorption chillers are currently used for industrial applications such as factories, buildings or large stores.
It is mainly used for commercial facilities.

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 to evaporate. The cooling medium (usually water) circulating between the fan coil unit provided in the room to be cooled by the latent heat of evaporation and the refrigerator is cooled. On the other hand, the operation is performed in a cycle in which the evaporated refrigerant vapor is absorbed into a concentrated solution (absorbing liquid) by a water-cooled absorber and returned to the regenerator again.

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

[0005] However, the conventional air-conditioning apparatus using a water-cooled absorption chiller has the following problems.

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

(2) Since it is necessary to connect the fan coil unit in the room to be cooled and the refrigerator with a pipe for circulating cooling medium, construction costs and equipment costs are high. This is the same for an ammonia absorption refrigerator using ammonia water as the absorbing liquid and the refrigerant.

Therefore, the present inventors perform a cooling cycle operation in which the condenser and the absorber are cooled not by the water cooling system but by the air cooling system, and the air to be cooled is directly passed through the evaporator to be cooled instead of using the cooling medium. Proposing an air conditioner (Japanese Patent Application No. Hei 5)
-22351).

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

[0010] As shown in FIG.
The outdoor unit 1 is disposed outside the room 5 of the house to be air-conditioned by a configuration as shown in FIG. 5, and the indoor unit 2 has only the cool air outlet and the indoor air inlet. And is disposed inside the chamber 5. The outdoor unit 1 and the indoor unit 2 are connected by a cooling air blow duct 3 and a room air intake duct 4. Reference numeral 6 denotes a remote controller for starting or stopping the operation of the apparatus, setting or canceling the automatic operation, setting the room temperature, and adjusting the amount of blown cold air.

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

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

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

The condenser 16 has a function of cooling and liquefying the refrigerant vapor sent from the regenerator 12 by an air-cooling fan 17, and converts a part of the refrigerant into the 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 air-cooled by the same air-cooling fan 17 as the condenser 16. The absorbent whose concentration has been lowered by absorbing the refrigerant is temporarily stored in the dilute solution tank 21.

Reference numeral 22 denotes a dilute solution tank 21 and a regenerator 12.
A heat exchanger 23 for performing heat exchange between a low-temperature absorbent having a low concentration and flowing toward the absorber 20 and a high-temperature absorbent having a high concentration flowing from the regenerator 12 to the absorber 20 absorbs the refrigerant and has a low concentration. A pump 24 for sending the absorbed liquid from the dilute solution tank 21 to the regenerator 12 is connected to the upstream of the evaporator 10 and the condenser 16.
And a pressure loss member such as a capillary provided between the downstream side and the downstream side.

V1, V2, V3, V4, and V5 are control valves such as solenoid valves. Particularly, V4 has a check function that does not allow a dilute solution to flow from the dilute solution tank 21 to the refrigerant tank 18 side. It is a valve.

The above air conditioner basically controls each container by controlling the temperature of each container except that a pump 23 is used to send the absorbing liquid 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 out 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 a change in the temperature of the outside air or the like, smooth and stable operation is performed according to the current situation. It is required to continue the operation. Stabilizing the circulation of the refrigerant under various conditions in the absorption refrigerator is one means for achieving this demand.

In an air conditioner of a system in which a pump is used only for supplying a dilute solution to a regenerator and the refrigerant itself is circulated by a pressure difference between various parts in the apparatus, a stable circulation of the refrigerant according to the situation is performed. In order to maintain a 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 rotation speed of the air cooling fan for cooling the condenser in accordance with the temperature of the condenser, thereby stably sending the liquefied refrigerant from the condenser to the evaporator, and stabilizing the liquefied refrigerant. An air conditioner capable of exerting cooling capacity has been proposed (Japanese Patent Application No. 5-264296).

[0022]

In the above-mentioned air conditioner, if the PID control method well known in the art is used for controlling the motor speed of the air cooling fan for cooling the condenser, for example, a disturbance is caused. Controllability may be degraded due to fluctuations in the gas input depending on the outside air temperature or the opening of the fuel supply control valve.

Therefore, it is conceivable to use modern control to cope with various load fluctuations. However, modern control presupposes a certain condition, for example, the outside air temperature of the place where the device is installed, and controls using a so-called optimal regulator so that the most appropriate control can be performed under the assumed condition. For this reason, when the installation conditions of the apparatus are different or there is a difference between the apparatuses, there is a problem that the optimal regulator designed in advance cannot 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, and even if a condition occurs in which the condenser temperature cannot be appropriately controlled by a pre-designed optimal regulator of modern control due to different installation conditions of the air conditioner, etc. It is an object of the present invention to provide an air conditioner using an absorption refrigerator capable of appropriately rotating an air-cooling fan and controlling the pressure of a condenser well.

[0025]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an evaporator for evaporating a refrigerant, an absorbing liquid for absorbing the refrigerant, and a refrigerant vapor evaporated by the evaporator for the absorbing liquid. An absorber for absorbing, a regenerator for heating the diluted absorbing liquid that has absorbed the refrigerant vapor to generate the refrigerant vapor and the concentrated absorbing liquid, and a condenser for condensing the refrigerant vapor generated by the regenerator, A refrigerant is sent from the condenser to the evaporator by the pressure difference between the condenser and the evaporator, and the air in the room to be air-conditioned by the evaporator is directly cooled. In an air conditioner using an absorption refrigerator that performs cooling by blowing air, an air cooling fan that cools the condenser, an outside air temperature detecting unit that detects an outside air temperature, and a gas that is burned by a burner that heats the regenerator Gas imp Gas input detection means for detecting the temperature of the condenser, condenser temperature detection means for detecting the temperature of the condenser, and under predetermined assumed conditions, the rotation speed of the air-cooling fan, the outside air temperature and the gas input, and Design means for designing an optimal regulator using the condenser temperature as an output, first storage means for storing a first weight matrix in an evaluation function for designing the optimal regulator, and the condenser under the assumed conditions Temperature storage means for storing an appropriate refrigerant temperature of the vessel, second storage means for storing a second weight matrix, and calculation means for calculating an optimum air-cooling fan rotation speed from an optimum regulator designed by the design means. Comparing the temperature of the condenser with the appropriate temperature of the temperature storage means, and when it is determined that the temperature is not properly controlled, 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, an optimal regulator is designed by evaluating the evaluation function of the first weight matrix, and the air-cooling fan is controlled by the control of the optimal regulator. Therefore, in normal use in the same range as expected, the condenser temperature is appropriately controlled by the air-cooling fan.

On the other hand, if the actual operating condition is different from the initial expected condition due to some reason such as instrumental difference or installation condition, the optimal regulator designed by using the evaluation function of the first weighting matrix can control properly. No longer occurs, 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 optimal regulator is designed based on this. Therefore, by setting the second weight matrix so that an appropriate state can be created under other conditions, the transient characteristics, energy consumption, and the like are set to optimal values in the device, and the air-cooling fan is appropriately controlled. Controlled by
The condenser temperature is controlled to the target temperature.

[0028]

An embodiment of the present invention will be described below with reference to the drawings.

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

The basic configuration of the air conditioner according to the present invention is the same as the configuration shown in FIG. 5, so that the description thereof will be omitted, and the electric circuit required for controlling the device will be mainly described.

T1 is a temperature sensor for detecting the indoor temperature provided on the upstream side of the evaporator 10, T2 is a temperature sensor for detecting the blast 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 denotes 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 (FIG. 6).
) Is received by the receiving unit 2a of the indoor unit 2,
A communication controller 31 for receiving a signal from the receiving unit 2a is provided, and the controller 30 includes temperature sensors T1, T
2, signals from T4, T5 and level sensor T3;
Receiving the signal from the communication controller 31,
The operation of the air-cooling fan 17, the pump 23, and the fuel supply control valve 15 is controlled.

Further, as shown in FIG. 1, the controller 30 includes a design means 26 for designing an optimum regulator, a calculation means 27 for calculating the number of revolutions of the air-cooling fan 17 using the designed optimum regulator, and a drive for driving the air-cooling fan 17. Means 28, first storage means 7 for storing the _first weight matrices Q ₁ and R ₁ , second storage means 8 for storing the _second weight matrices Q ₂ and R ₂ , and an appropriate temperature under predetermined assumed conditions. Temperature storage means 37 for storing, temperature detection means 38 connected to sensor T4 for detecting the temperature of condenser 16, and temperature detection means 38
Compares the detected temperature of the condenser 16 with the appropriate temperature, and if it is determined that the temperature is not properly controlled, the second storage means 8 is connected to the design means 26 instead of the first storage means 7. Changing means 29.

Here, the first weight matrices Q ₁ and R ₁
Is a weighting matrix of an evaluation function that is set assuming a certain predetermined condition in the actual situation. According to the optimal regulator evaluated with this weighting matrix, optimal control is performed under that condition. ing.

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

The second storage means 8 may store a plurality of sets of weight matrices having different values of Q and R in addition to the weight matrices Q ₂ and R ₂ . The weight matrix is appropriately selected by the changing unit 29 and sent to the designing unit 26. Further, the first storage means 7 or the like for preliminarily storing the weight matrices Q and R may be a non-volatile memory (for example, a ROM) which does not lose its stored contents even when power is not supplied to the air conditioner. preferable.

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

Before the start of operation, the valves V1, V3, V5 are closed and the valves V2, V4 are open. All of the absorbing liquid is 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
4 is closed (F-1), the motor M ₂ is driven pump 2
3, the absorbing solution is sent from the dilute solution tank 21 to the regenerator 12 (F-2). At this time, C in the controller 30
The PU checks the signal from the level sensor T3 to determine whether or not the liquid level of the regenerator 12 has reached a specified level (F
-3). When the liquid level reaches a specified level, the fuel supply control valve 15 is opened to supply fuel gas from the fuel supply pipe 14 and ignite the burner 13 (F-4).

The refrigerant vapor is generated in the regenerator 12 and the condenser 16
And the temperature of the condenser 16 gradually rises due to the temperature of the refrigerant vapor. CPU in the controller 30 determines whether or not the temperature of the condenser 16 by a signal from the temperature sensor T4 has reached a predetermined value (F-5), the cooling fan 17 by the motor M ₁ is when it reaches a predetermined value (F-
6).

In the condenser 16, the vapor refrigerant sent from the regenerator 12 is liquefied, and the 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 amount of the refrigerant in the refrigerant tank 18 has reached a predetermined amount (F-7). When the amount of the refrigerant has reached the predetermined amount, the valve V5 is closed (F-8). The fan 11 is rotated (F-9).

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

In this cooling operation, the refrigerant evaporated and vaporized in the evaporator 10 flows into the absorber 20, where it is absorbed by the absorbing liquid. The absorption liquid whose concentration has been reduced by absorbing the refrigerant once enters the dilute solution tank 21 and is then pumped.
Is exchanged with the high-concentration high-temperature absorbent discharged from the regenerator 12 in the heat exchanger 22 through the valve V3. This state is the steady mode of operation.

When the start button of the remote controller 6 is turned off (F-11), a stop process is performed (F-12), and the process ends. In the stop processing, first, the burner 13 is extinguished, the valves V2 and V4 are opened, and the valve V1 is closed. Next, 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
All of the absorption liquid in 2 flows into the dilute solution tank 21. This is due to the fact that while the device is stopped,
8 and the regenerator 12 to prevent corrosion and dilute the concentrated solution to prevent crystallization.

Next, an air conditioner using an absorption refrigerator is
Control according to the present invention for continuing smooth and stable operation according to the situation at that time will be described.

In the present embodiment, first, when creating a model of a servo system for controlling the outlet temperature of the condenser 16,
The outside air temperature detected by the temperature sensor T5, the amount of supply gas according to the opening of the fuel supply control valve 15 (hereinafter referred to as "gas input"), and the motor M for rotating the air cooling fan 17
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]

[Number 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, the gas input, and the number of rotations of the air-cooling fan, 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 second order.

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. Can be.

Equation 1 is an ARX model in which the delay of the system is 0. Here, the ARX model is a discrete-value 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]

X (t + 1) = AｔX (t) + BU ・ (t)

[0052]

Y (t) = C ・ X (t) + DU ・ (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 Equations 2 and 3
(In this embodiment, the outside air temperature, the gas input, and the number of rotations of the air-cooling fan are combined into one matrix.) The output Y (t) (in this embodiment, the condenser outlet temperature) and X (1) are Once obtained, the coefficients A, B, C, and D of the above state equation and output equation can be calculated. Calculating the coefficients A, B, C, and D and formulating the relationship between the input and the output in this manner 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 Equations 1 to 3.

In FIG. 4, reference numeral 35 denotes a servo system to be controlled, and reference numeral 36 denotes a CP in the controller 30 shown in FIG.
This is an additional integrator realized by U. U (k) is the number of rotations of the air-cooling fan which is an input to the control target, x (k) is a state variable, and y (k) is the condenser 1 measured by the temperature sensor T4.
6, r (k) is a target value of the outlet temperature of the condenser 16, e (k) is a difference obtained by subtracting an actually measured value from the target value of the outlet temperature of the condenser 16, and z (k) is This is an integrated value of a difference obtained by subtracting an actually measured value from a 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 obtain the feedback gains F ₁ and F ₂ . Therefore, next, a method of obtaining 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 state equation of Equation 2 and finding an optimal solution. Equation 4 is a quadratic form evaluation function serving as an index of this evaluation.

[0058]

(Equation 4) Optimum control is to determine the control input U so as to minimize the value J of the evaluation function shown in Expression 4, and by obtaining the control input U, the feedback gains F ₁ and F _{2 are obtained.}
Can be requested.

In equation (4), X ^T and U ^T are transposes of matrices X and U, respectively, and Q and R are
This is a weight matrix determined in advance based on the responsiveness required for the system, input restrictions, and the like. The weight matrices Q and R are stored in the first storage unit 7 or the like, and the weight matrices Q
Is a non-negative definite (Q ≧ 0) and R is a positive definite (R> 0) symmetric matrix. Increasing the weight matrix Q increases the responsiveness of X, and increasing the weight matrix R decreases the control input U. . That is,
Reducing the evaluation function J requires conflicting 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 the equation (5), (r (k) −y (k)) is the condenser 1
6 is a difference obtained by subtracting the actually measured value from the target value of the temperature at the outlet, that is, e (k).

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 determined. In this embodiment, in the output equation of Expression 3, C = [1, 0] and D = 0, X (1) is set to an appropriate value, and the feedback gains F ₁ and F ₂ are 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 temperature of the outlet of the condenser 16 is adjusted appropriately by rotating the air-cooling fan 17 at the rotation speed obtained by the calculation. And the control of the air conditioner by the optimal regulator is realized.

However, when there is a difference between the equipment actually installed and the equipment assumed in the design stage in advance, or when the conditions of the installation place are largely different from the initially assumed conditions, the condenser temperature may be reduced. May not be properly controlled to the target temperature. As described above, since the weight matrices Q ₁ and R ₁ are determined with emphasis on reducing the energy consumption, control by the feedback gains F ₁ and F ₂ obtained from the weight matrices Q ₁ and R ₁ is actually necessary. This is because the capacity calculated from the air cooling fan capacity is insufficient, and the cooling may not be sufficient.

The control in such a case will be described next.

After a certain period of time has elapsed from the start of operation, the temperature of the condenser 16 is measured. Then, the measured value is compared with the original target temperature, and if there is a deviation equal to or more than a predetermined value (measured value> target temperature), the condenser 16
The conversion means 29 determines that the cooling is not sufficient with the temperature of the high-temperature memory kept high, reads the weight matrices Q ₂ and R ₂ from the second storage means 8, and outputs the first weight matrices Q
₁ and R ₁ are replaced by _second weight matrices Q ₂ and R ₂ .

The design means 26 performs an evaluation based on the changed second weight matrices Q ₂ and R ₂ to newly design an optimal regulator. Second weight matrix Q ₂ and R
₂ is a weight matrix (Q ₂ > Q ₁ ) that emphasizes transient characteristics. Therefore, in an optimal regulator designed by evaluating an evaluation function using the second weight matrices Q ₂ and R ₂ as weight matrices, the air-cooling fan 17 increase the number of revolutions and therefore
The condenser 16 is sufficiently cooled and can be appropriately controlled.

On the other hand, although the target temperature is achieved, the calculated value is higher than the actually required rotation speed of the air cooling fan 17.
It may be determined that energy consumption is too large.
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 is equal to or greater than a predetermined value (that is, when the energy consumption of the air cooling fan 17 is equal to or greater than a certain value). .

At this time, the weight matrix of the design means 26 is changed to weight matrices Q ₃ and R _{3 in} which the value of R is reduced. By reducing the value of R, the weight matrices Q ₃ and R ₃ are weight matrices that emphasize energy consumption reduction, and the optimal regulator evaluated using the weight matrices Q ₃ and R ₃ as the evaluation function is used. For example, it is possible to appropriately suppress the rotation ability of the air-cooling fan 17 and perform appropriate control with high energy consumption characteristics and no waste.

As described above, according to the air conditioner of the present embodiment, when it is determined that the temperature control of the condenser 16 is not properly performed, the weight matrices Q and R
Therefore, the optimal regulator can be newly designed to be suitable for each device having different installation conditions and states of the air conditioner, and appropriate control can always be maintained.

In this embodiment, the optimal regulator is designed using the ARX model. However, it may be calculated using the least squares method or the prediction error method using another model.

Further, in this embodiment, an aqueous solution of lithium bromide is used as the absorbing solution and water is used as the refrigerant. However, the present invention is not limited to this. For example, the present invention can be applied to a 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. Optimal regulators can be newly designed for each device with different characteristics, and optimal regulators can be changed 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 controlled appropriately to bring the condenser temperature closer to the target temperature, and good controllability can be obtained.
In addition, it is possible to provide an air conditioner using an absorption refrigerator that is resistant to disturbances and the like.

[Brief description of the 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 flowchart of a steady mode of operation of the air conditioner according to the present invention.

FIG. 4 is a state variable diagram of a servo system of the 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 modification of an air conditioner using a single-effect absorption refrigerator proposed in the prior application.

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

[Explanation of symbols]

REFERENCE SIGNS LIST 1 outdoor unit 2 indoor unit 3 air duct 4 air intake duct 5 room 6 remote control operation device 7 first storage means 8 second storage means 10 evaporator 11 blower fan 12 regenerator 13 burner 14 fuel supply pipe 15 fuel supply control valve 16 condensation Device 17 Air cooling fan 18 Refrigerant tank 20 Absorber 21 Dilute solution tank 26 Design means 27 Calculation means 28 Driving means 30 Controller 31 Communication controller 37 Temperature storage means 38 Temperature detection means T1, T2, T4, T5 Temperature sensor T3 Level sensor V1 , V2, V3, V4, V5 valve M _1, M ₂ motor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-206268 (JP, A) JP-A-2-259373 (JP, A) JP-A-64-28456 (JP, A) JP-A-6-256 2927 (JP, A) JP-A-8-29005 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 15/00 306

Claims (3)

(57) [Claims] 1. An evaporator for evaporating a refrigerant, an absorber for storing an absorbing liquid for absorbing the refrigerant and absorbing the refrigerant vapor evaporated by the evaporator to the absorbing liquid, and heating the diluted absorbing liquid for absorbing the refrigerant vapor. And a condenser for condensing the refrigerant vapor generated in the regenerator, and a condenser for condensing the refrigerant vapor generated in the regenerator, wherein a pressure difference between the condenser and the evaporator causes the condenser to evaporate from the condenser. An air conditioner using an absorption refrigerator that sends a refrigerant to the evaporator, directly cools air in the room to be air-conditioned by the evaporator, and blows the cooled air into the room through a duct to perform cooling. In the above, an air 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, and the condensation And a condenser temperature detecting means for detecting the temperature of the air conditioner, and under predetermined assumed conditions, an optimum regulator is designed with the rotation speed of the air-cooling fan, the outside air temperature and the gas input as inputs, and the condenser temperature as an output. Design means; temperature storage means for storing an appropriate temperature of the condenser under the assumed conditions; and a first evaluation function of an evaluation function for designing the optimal regulator.
A first storage unit for storing a weight matrix of the following, a second storage unit for storing a second weight matrix, and an arithmetic unit for calculating an optimal air-cooling fan rotation speed from an optimal regulator designed by the design unit, The temperature of the condenser is compared with an appropriate temperature of the temperature storage means, and when it is determined that the condenser temperature is not properly controlled, a weight matrix of the design means is changed from the first weight matrix to the second weight matrix. An air conditioner comprising: a changing unit that changes the weight matrix into two; and an air-cooling fan driving unit that drives the air-cooling fan at a rotation speed calculated by the calculating 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 said first storage means and said second storage means are nonvolatile storage means.