JP2002310528A - Control device for absorption type refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device wherein energy saving operation and safety are compatible. SOLUTION: The control device 50 is provided with a control program that during energy saving operation effected in a state that a flow rate of cooling water fed to an absorber 2 and a condenser 6 is limited to a value lower than a rated flow rate, the number of revolutions of a cooling water pump 26 is returned to the rated number of revolutions when the temperature T5 of a weak absorbent solution detected by a temperature detecting means 42 exceeds a given temperature, for example, 40 deg.C and the temperature T6 of the solution in a high temperature regenerator 3 detected by a temperature detecting means 43 is a given temperature, for example, 155 deg.C, an opening V of a heating amount control valve 22 is a given opening, for example, 80% or less of an opening during the rated operation, and a flow rate of cooling water fed to the absorber 2 and the condenser 6 through cooling water piping 25 is returned to a rated flow rate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an absorption refrigerator.

[0002]

2. Description of the Related Art As global environmental problems increase, demands for energy savings have been increasing. Further, in the air conditioning system, further improvement in efficiency is required, for example, the standard of the air conditioning energy consumption coefficient is strengthened by the revision of the Energy Conservation Law.

For the absorption type refrigerator for air conditioning, a large temperature difference system and the like are being studied for the purpose of reducing the transfer power of the chilled water system, such as increasing the efficiency of the heat source unit itself. Energy saving by has not been considered so far.

One of the reasons is that when the flow rate of the cooling water changes, it affects the internal cycle of the absorption refrigerator.
This is because it becomes difficult to ensure safe driving. That is, in the absorption refrigerator, when the flow rate of the cooling water is reduced, the efficiency of the absorber and the condenser is reduced, and not only the amount of heat supplied to the high-temperature regenerator needs to be increased, but also the pressure and the pressure in the high-temperature regenerator need to be increased. Since the temperature rises, it is common to reduce the flow rate of the cooling water by monitoring the temperature of the cooling water outlet that affects the temperature and pressure of the high-temperature regenerator even when energy saving is to be achieved.

[0005] Further, control is also performed to decrease the flow rate of the cooling water when the temperature of the high-temperature regenerator, which is related to the magnitude of the air conditioning load, is low, and to increase the flow rate of the cooling water when the temperature rises. On the other hand, when the operation is performed with the flow rate of the cooling water reduced, and the temperature of the high-temperature regenerator exceeds a predetermined temperature, the cooling water is returned to the rated flow rate to ensure safety.

[0006]

In the conventional control in which the operation of returning the flow rate of the cooling water to the rated flow rate from the energy saving operation in which the flow rate of the cooling water is reduced, based on only the temperature of the high-temperature regenerator, The cooling water flow rate may be returned to the rated flow rate even if no problem occurs even if the energy saving operation with the reduced flow rate is continued. Since it was not an energy-saving operation, it was necessary to provide a control technology capable of controlling the flow rate of the cooling water to the rated flow rate only when it was really necessary, which was an issue to be solved.

[0007]

According to the present invention, a control signal for controlling the amount of heat supplied to a regenerator, cooling water supplied to an absorber and a condenser are provided as specific means for solving the above-mentioned problems of the prior art. In a control device of an absorption refrigerator having a function of outputting a control signal for controlling the flow rate of

While outputting the control signal for limiting the flow rate of the cooling water to less than the rated flow rate, a function is provided for outputting a control signal for returning the flow rate of the cooling water to the rated flow rate when the temperature of the diluted absorbing solution becomes higher than a predetermined temperature. A control device of the first configuration,

During the output of the control signal for limiting the flow rate of the cooling water to less than the rated flow rate, the temperature of the regenerator is equal to or higher than a predetermined temperature, and the opening of a valve for controlling the amount of heat supplied to the regenerator is equal to or lower than a predetermined opening.
A control device having a second configuration, having a function of outputting a control signal for returning the flow rate of the cooling water to the rated flow rate when the temperature of the diluted absorbing solution is equal to or higher than a predetermined temperature;

During the output of the control signal for limiting the flow rate of the cooling water to less than the rated flow rate, a function of outputting a control signal for returning the flow rate of the cooling water to the rated flow rate when the concentration of the concentrated absorbing solution becomes a predetermined concentration or more. A control device of a third configuration provided for;

[0011] During the output of the control signal for limiting the flow rate of the cooling water to less than the rated flow rate, the temperature of the regenerator is equal to or higher than a predetermined temperature, and the opening of a valve for controlling the amount of heat supplied to the regenerator is equal to or lower than a predetermined opening.
A control device having a fourth configuration having a function of outputting a control signal for returning the flow rate of the cooling water to the rated flow rate when the concentration of the concentrated absorbent is equal to or higher than a predetermined concentration;

During the output of the control signal for limiting the flow rate of the cooling water to less than the rated flow rate, when the temperature of the cooling water discharged after finishing the cooling operation in the absorber or the condenser becomes higher than a predetermined temperature, the flow rate of the cooling water is reduced. By providing a control device having a fifth configuration that has a function of outputting a control signal for returning the flow rate to the rated flow rate, the above-described problem of the related art is solved.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a schematic configuration diagram of an absorption chiller / heater which is an absorption refrigerator using, for example, water as a refrigerant and a lithium bromide (LiBr) solution as an absorption liquid (solution).
Is an evaporator, 2 is an absorber, 3 is a high-temperature regenerator heated by, for example, a gas burner 4, 5 is a low-temperature regenerator, 6 is a condenser, and 7 is a thin liquid of the absorbent flowing from the absorber 2 to the high-temperature regenerator 3. That is, the rare absorbing solution and the low-temperature regenerator 5 to the absorber 2
A low-temperature heat exchanger, which is a solution heat exchanger for exchanging heat with the concentrated absorbent, that is, a rare absorbent that flows from the absorber 2 to the high-temperature regenerator 3 via the low-temperature heat exchanger 7 A high-temperature heat exchanger, which is a solution heat exchanger that exchanges heat with the intermediate concentration absorbent flowing from the high-temperature regenerator 3 to the low-temperature regenerator 5;
11 to 15 are absorbent pipes, 16 is an absorbent pump, 17 to
19 is a refrigerant pipe, 20 is a refrigerant pump, 21 is a gas pipe connected to the gas burner 4, 22 is a heating amount control valve, 23 is a cold / hot water pipe provided with an evaporator heat exchanger 24 in the middle, 25
Is a cooling water pipe provided with a cooling water pump 26, an absorber heat exchanger 27, and a condenser heat exchanger 28 in the middle, each of which is connected as shown in FIG.

Reference numeral 29 denotes a refrigerant bypass pipe connecting the refrigerant liquid reservoir 30 of the evaporator 1 to the absorbent liquid reservoir 31 of the absorber 2; 32, an open / close valve; 33, an absorbent pipe 12 and the absorber 2;
Is an on-off valve, 34 is an on-off valve, 35 is a refrigerant vapor bypass pipe connecting the refrigerant pipe 17 and the absorber 2, and 36 is an on-off valve, each of which is connected as shown in the figure. 32, 34 and 36 are closed when supplying cold water,
Open when supplying hot water.

Reference numeral 37 denotes a frequency converter for converting the electric power applied to the cooling water pump 26 to a desired frequency, and reference numeral 38 denotes a temperature which is installed on the inlet side of the evaporator 1 of the cold / hot water pipe 23 and detects the inlet temperature T1 of the cold water. Detecting means, 39 is cold / hot water pipe 2
Temperature detecting means 40 installed on the outlet side of the evaporator 1 for detecting the outlet temperature T2 of the cold water, and 40 is a temperature detecting means installed on the inlet side of the absorber 2 of the cooling water pipe 25 for detecting the inlet temperature T3 of the cooling water. A means 41 is provided on the outlet side of the condenser 6 of the cooling water pipe 25 to detect the outlet temperature T4 of the cooling water, and a 42 is provided on the inlet side of the low-temperature heat exchanger 7 of the absorbent pipe 11 for absorption. Temperature detecting means 43 for detecting the temperature T5 of the diluted absorption liquid flowing out of the high temperature regenerator 3 from the high temperature regenerator 3
A temperature detecting means 44 for detecting the concentration 6 is a concentration detecting means for detecting the concentration N of the concentrated absorbent flowing from the low-temperature regenerator 5 to the absorber 2 by being installed in the absorbent pipe 14.

Reference numeral 50 denotes a control device of the present invention comprising a microcomputer and the like.
Signals are input from 8 to 44 to control the amount of heat supplied to the high-temperature regenerator 3 and the flow rate of the cooling water flowing through the cooling water pipe 25.

In FIG. 1 showing the configuration of the control device 50,
Reference numeral 51 denotes input means for inputting detection signals from the detection means 38 to 44 and converting and outputting the signals to the central processing means 52; 53, storage means for storing a control program and the like; For example, setting input means for setting the lowest frequency of the power frequency applied to the cooling water pump 26, the changing speed of the power frequency applied to the cooling water pump 26, a cost coefficient κ described later, and the like, 55 controls the heating power of the gas burner 4. Therefore, a capacity control output for outputting a required control signal to the heating amount control valve 22 in response to a calculation result of the central processing unit 52 executed based on the outlet temperature T2 of the cold water detected by the temperature detection unit 39 and the like. Means 56 is a rotation of the cooling water pump 26 that supplies cooling water to the absorber heat exchanger 27 of the absorber 2 and the condenser heat exchanger 28 of the condenser 6 via the cooling water pipe 25. To control the receives the operation result of the central processing unit 52 is an external output means for outputting the required control signals such as the frequency converter 37.

In the chilled water supply operation by the absorption chiller having the above structure, the refrigerant evaporated in the high temperature regenerator 3 flows to the condenser 6 through the low temperature regenerator 5 as in the conventional case, and the heat of the condenser is cooled by the cooling water pump 26. After condensing by exchanging heat with the cooling water flowing through the exchanger 28, the refrigerant flows to the evaporator 1 via the refrigerant pipe 18. Then, the refrigerant exchanges heat with water flowing through the evaporator heat exchanger 24 to evaporate, and the evaporator heat exchanger 24
The water flowing through is cooled. And cold water is cold and hot water piping 2
The cooling water is circulated through a load 3 (not shown) to perform a cooling operation and the like.

The refrigerant evaporated in the evaporator 1 is absorbed by the absorbing liquid in the absorber 2 which is cooled by the cooling water flowing through the absorber heat exchanger 27 by the cooling water pump 26.
The diluted absorbing liquid having a reduced absorption liquid concentration by absorbing the refrigerant is sent to the high temperature regenerator 3 via the low temperature heat exchanger 7 and the high temperature heat exchanger 8 by the operation of the absorption liquid pump 16. The absorbing liquid sent to the high-temperature regenerator 3 is heated by the gas burner 4 to evaporate the refrigerant, and the medium-absorbing liquid flows through the high-temperature heat exchanger 8 to the low-temperature regenerator 5. In the low-temperature regenerator 5, the absorbent is heated by the refrigerant vapor flowing from the high-temperature regenerator 3 through the refrigerant pipe 17, and the refrigerant vapor is further separated to increase the concentration of the absorbent. The concentrated absorbent having an increased concentration of the absorbent is cooled down through the low-temperature heat exchanger 7 and sent to the absorber 2 to be dispersed.

The power cost excluding the fixed cost for operating the cooling water pump 26, that is, the ratio of the power fluctuation cost to the rated operation is, for example, as shown by broken lines in FIGS. 3A and 3B. It decreases as the flow rate ratio R decreases. On the other hand, the ratio of the fuel variable cost consumed by the high-temperature regenerator 3 to the rated operation decreases as the load factor W decreases, for example, as shown by the thin line in FIGS. The load ratio W and the flow rate ratio R of the cooling water are decreased as the ratio R increases, and decreased as the cooling water inlet temperature T3 to the absorber 2 decreases.
And the cooling water inlet temperature T3 can be expressed as a variable.

Accordingly, FIG. 3 is a graph in which the power fluctuation cost for operating the cooling water pump 26 is added to the fuel fluctuation cost.
(A) and (B) show the total variable cost curve shown by a thick solid line, and the minimum value of the total variable cost curve, that is, the minimum cost curve connecting the minimum cost points, the load factor W and the flow rate R of the cooling water. And the cooling water inlet temperature T3 as a variable. FIG. 3C shows a minimum cost curve using the cooling water inlet temperature T3 as a parameter.

As is well known, since the unit price of power and fuel generally differs for each customer, the power variable cost curve and the fuel variable cost curve shown in FIG. 3 also differ for each customer. Therefore, the sum of the variable electricity cost and the variable fuel cost,
In other words, an arithmetic expression for calculating the flow rate ratio R to the rated flow rate of the cooling water that minimizes the total running cost usually needs to be determined for each customer. However, operating the cooling water pump 26 at a predetermined operating condition, for example, during the rated operation. Coefficient κ, which is the ratio of the power fluctuation cost consumed for this purpose and the fuel fluctuation cost consumed by the gas burner 4 at that time, the load factor W, and the inlet temperature T3 of the cooling water detected by the temperature detecting means 40 are defined as variables. Since it has been found that the calculation can be performed by one of the calculation formulas, the calculation formula is stored in the storage means 53 of the control device 50.

That is, the load ratio W (%) is stored in the storage means 53 of the control device 50 based on the temperature difference (T1-T2) between the inlet temperature T1 and the outlet temperature T2 of the cold water detected by the temperature detecting means 38 and 39. ), For example, W = (T1−T2) ÷ 5 × 100 (when the temperature difference at the time of rated operation is 5 ° C.), and the load factor W obtained by the equation. Using the cooling water inlet temperature T3 detected by the temperature detecting means 40 and the cost coefficient κ as variables, the flow rate with respect to the rated flow rate of the cooling water at which the sum of the power fluctuation cost and the fuel fluctuation cost is the lowest, that is, the total running cost is the lowest. One arithmetic expression for calculating and calculating the ratio R (%), for example, R = ｛F (W) + F (T3) + A｝ ÷ F (κ), where
A stores a constant.

Then, when the absorption chiller is delivered and installed, the value of the cost coefficient κ is calculated based on the unit price of the electric power contracted by the customer at the delivery destination and the unit price of the gas contracted with the gas company. By operating the setting input means 54, the value is set as the cost coefficient κ, and the lower limit value of the power frequency applied to the cooling water pump 26 (for example, less than 50% of the rated value is 50% when the rotation speed control becomes unstable). ) And the cooling water pump 26
Change rate ΔH (for example, 5% / 1
) Is set by operating the setting input means 54 of the control device 50.

The control of the flow rate of the cooling water by the control unit 50 when the absorption refrigerator is operated as described above will be described with reference to the flowchart of FIG.

In step S1, the temperature detecting means 3
The temperature is detected by 8.39.40. Subsequent step S
In 2, the load factor W at that time is calculated based on the inlet temperature T1 and the outlet temperature T2 of the cold water detected by the temperature detecting means 38 and 39.

In step S3, the target power frequency Ht to be applied to the cooling water pump 26 to operate the cooling water pump 26 at the rotational speed at which the total running cost is minimized is determined by the cost coefficient κ and the temperature detection in step S1. The calculation is performed based on the cooling water inlet temperature T3 detected by the means 40 and the load factor W calculated in step S2.

In step S4, it is determined whether or not the target power frequency Ht calculated in step S3 is equal to or higher than the power frequency Hn currently applied to the cooling water pump 26.

If the determination in step S4 is YES, the process proceeds to step S5 to output Hn + ΔH to the frequency conversion device 37. In the subsequent step S7, the power frequency H to be newly added to the cooling water pump 26 is output.
To the frequency, ie, Hn + ΔH.
7 and the rotational speed of the cooling water pump 26 is actually changed in step S8.

On the other hand, if the determination in step S4 is NO, the process proceeds to step S6 to output Hn-.DELTA.H to the frequency converter 37. Then, the process proceeds to step S7 to add the electric power newly added to the cooling water pump 26. The frequency converter 37 converts the frequency H to the frequency, that is, Hn-ΔH.
The rotation speed of the cooling water pump 26 is actually changed in step S8.

As described above, the cooling water pump 26 is controlled to an optimum rotation speed based on the temperature information of the cooling water detected by the temperature detecting means 38 and 39 and the temperature information of the cooling water detected by the temperature detecting means 40. Therefore, the total running cost of the power fluctuation cost required to operate the cooling water pump 26 and the fuel fluctuation cost consumed by the gas burner 4 is smaller than when the cooling water pump 26 is operated at rated speed as shown in FIG. Remarkably suppressed.

The storage means 53 of the control device 50 stores
The rare absorption detected by the temperature detecting means 42 during the above-mentioned energy saving operation in which the supply of the cooling water to the absorber heat exchanger 27 of the absorber 2 and the condenser heat exchanger 28 of the condenser 6 is limited to the rated flow or less. The temperature T5 of the liquid is a predetermined temperature, for example, 40 ° C. or higher,
The temperature T6 of the solution in the high-temperature regenerator 3 detected by the temperature detecting means 43 is a predetermined temperature, for example, 155 ° C., and
When the opening V of the heating amount control valve 22 is a predetermined opening, for example, 80% or less of the opening during rated operation, the cooling water pump 26
And a control program for returning the flow rate of the cooling water supplied to the absorber heat exchanger 27 and the condenser heat exchanger 28 to the rated flow rate.

Therefore, in the absorption refrigerator equipped with the control device 50 of the present invention, the supply of the cooling water to the absorber heat exchanger 27 of the absorber 2 and the condenser heat exchanger 28 of the condenser 6 is rated. Even if energy saving operation is performed to limit the flow rate to less than
When the temperature T5 of the diluted absorbent detected by the temperature detecting means 42 is equal to or higher than a predetermined value of 40 ° C., the temperature T6 of the solution in the high-temperature regenerator 3 detected by the temperature detecting means 43 is equal to or higher than a predetermined value of 155 ° C., and the heating amount control valve 22 is opened. When the condition that the temperature V is equal to or less than the predetermined 80% is simultaneously satisfied, and the comprehensive judgment determines that the high-temperature regenerator 3 has a fear of falling into a high-temperature / high-pressure abnormality due to a shortage of the cooling water, the cooling water The rotation speed of the pump 26 is returned to the rated rotation speed, and the cooling water of the rated flow rate is supplied to the absorber heat exchanger 27 of the absorber 2 and the condenser heat exchanger 28 of the condenser 6 via the cooling water pipe 25. Therefore, the high temperature regenerator 3 does not have a high temperature / high pressure abnormality.

That is, the heat exchanger 27 of the absorber 2 and the heat exchanger 2 of the condenser 6 are connected via the cooling water pipe 25.
The flow rate of the cooling water supplied to 8 is returned to the rated flow rate.
The determination is made not only based on the solution temperature T6 in the high-temperature regenerator 3 but also based on the temperature T5 of the dilute absorbing solution detected by the temperature detecting means 42 and the magnitude of the opening degree V of the heating amount control valve 22. Since the flow rate of the cooling water is increased only when there is a concern that the temperature of the fuel cell 3 may be abnormally high temperature and high pressure, there is a remarkable effect that energy saving and safety can be achieved at the same time.

Instead of the temperature T5 of the diluted absorption liquid detected by the temperature detection means 42, the absorption liquid concentration N of the concentrated absorption liquid detected by the concentration detection means 44 is adopted as a judgment material. When the concentration reaches a predetermined concentration, for example, 62% or more, the control device 5 outputs a control program for outputting a control signal for returning the rotation speed of the cooling water pump 26 to the rated rotation speed.
0 may be stored in the storage means 53, and the flow rate of the cooling water supplied to the absorber heat exchanger 27 of the absorber 2 and the condenser heat exchanger 28 of the condenser 6 may be returned to the rated flow rate.

Instead of the temperatures T5 and T6 detected by the temperature detecting means 42 and 43 and the opening degree V of the heating amount control valve 22, only the temperature T5 of the rare absorbing liquid detected by the temperature detecting means 42 is used as a judgment material. Can also be adopted. In this case, the temperature T5 of the diluted absorbing solution is equal to the predetermined temperature, that is, 40 ° C.
A control program for outputting a control signal for returning the rotation speed of the cooling water pump 26 to the rated rotation speed when the temperature reaches a predetermined temperature slightly higher than the predetermined temperature, for example, 43 ° C. or more, is stored in the storage means 53 of the control device 50. Then, when the temperature T5 of the diluted absorbing liquid detected by the temperature detecting means 42 becomes equal to or higher than a predetermined 43 ° C., the diluted absorbing liquid is supplied to the absorber heat exchanger 27 of the absorber 2 and the condenser heat exchanger 28 of the condenser 6. The flow rate of the cooling water to be returned may be returned to the rated flow rate.

Similarly, instead of the solution temperature T6 in the high-temperature regenerator 3 detected by the temperature detecting means 43, the opening degree V of the heating amount control valve 22, and the concentration N of the concentrated absorbing liquid detected by the concentration detecting means 44, In addition, only the absorption liquid concentration N of the diluted absorption liquid detected by the concentration detection means 44 is adopted as a determination material, and the absorption liquid concentration N becomes a predetermined concentration slightly higher than the predetermined concentration, that is, 62%, for example, 63% or more. The control program for outputting a control signal for returning the rotation speed of the cooling water pump 26 to the rated rotation speed when the
When the absorption solution concentration N of the concentrated absorption solution detected by the concentration detecting means 44 becomes 63% or more of a predetermined value, the absorber 2
Absorber heat exchanger 27 and condenser heat exchanger 28 of condenser 6
The flow rate of the cooling water supplied to the air conditioner may be returned to the rated flow rate.

Further, the temperature of the cooling water detected by the temperature detecting means 41, that is, heat is taken from the refrigerant vapor through the condenser heat exchanger 28, and the refrigerant vapor is condensed to form the cooling water pipe 25.
When the outlet temperature T4 of the cooling water flowing out to the predetermined temperature, for example, 40 ° C. or higher, a control program for outputting a control signal for returning the rotation speed of the cooling water pump 26 to the rated rotation speed is controlled by the control device 50. The cooling water outlet temperature T4 detected by the temperature detecting means 41 is stored in a predetermined
When the temperature reaches 0 ° C. or higher, the absorber heat exchanger 2 of the absorber 2
The flow rate of the cooling water supplied to the condenser heat exchanger 28 of the condenser 7 and the condenser 6 may be returned to the rated flow rate.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the present invention.

For example, in the control flow shown in FIG. 4, it is determined whether the calculated target power frequency Ht is equal to or higher than the power frequency Hn currently applied to the cooling water pump 26. The rotation speed of the cooling water pump 26 is controlled to be increased and the rotation speed of the cooling water pump 26 is decreased when the rotation speed is no, but when the target power frequency Ht is close to the current power frequency Hn, the rotation speed of the cooling water pump 26 is not changed. Can be added to control.

Further, an absorption refrigerator using a cooling water pump 26 of a type in which the number of poles is converted to control the number of rotations, or a plurality of cooling water pumps 26 are installed in parallel, and the cooling water is controlled by controlling the number of operating water pumps. As described above, even with an absorption refrigerator that controls the flow rate of the cooling water flowing through the pipe 25, the cost coefficient κ, the load factor W, and the inlet temperature T3 of the cooling water can be calculated using one arithmetic expression. The cooling water flow rate of the cooling water pipe 25 is controlled so that the total running cost is minimized, and the temperature T5 of the rare absorbing solution detected by the temperature detecting means 42 is equal to or higher than a predetermined 40 ° C. The solution temperature T6 in the high temperature regenerator 3 detected by
When the opening degree V of the heating amount control valve 22 becomes equal to or less than 80% or less, the high temperature regenerator 3 determines that there is a concern that the high temperature regenerator 3 may fall into a high temperature / high pressure abnormality due to a shortage of the cooling water. Return the rotation speed of the pump 26 to the rated rotation speed, and
The cooling water of the rated flow rate is supplied to the absorber heat exchanger 27 of the absorber 2 and the condenser heat exchanger 28 of the condenser 6 via the cooling water 5. It may not be abnormal.

As the absorption refrigerator, instead of the gas burner 4 for heating the absorption liquid in the high-temperature regenerator 3, a high-temperature steam or the like may be supplied to heat the absorption liquid.

Further, in the above embodiment, the description has been given based on the absorption refrigerator having a configuration capable of supplying cold water or hot water. However, the same operation control as described above is possible even with the absorption refrigerator which supplies only cold water. It is.

[0044]

As described above, the absorption type refrigerator equipped with the control device of the present invention has a remarkable operation and effect that both energy saving and safety can be achieved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration example of a control device of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of an absorption refrigerator controlled by a control device of the present invention.

[Figure 3] is an explanatory diagram of the minimum cost curve, (A) is obtained when the inlet temperature of the cooling water is 32 ℃, (B) is obtained when the inlet temperature of the cooling water is 20 ℃, (C) Shows the cooling water inlet temperature as a parameter.

FIG. 4 is an explanatory diagram of a control flow.

FIG. 5 is an explanatory diagram showing a reduction amount of a running cost.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Evaporator 2 Absorber 3 High temperature regenerator 4 Gas burner 5 Low temperature regenerator 6 Condenser 7 Low temperature heat exchanger 8 High temperature heat exchanger 11 ・ 12 ・ 13 ・ 14 ・ 15 Absorbent pipe 16 Absorbent pump 17.18 ・ 19 Refrigerant pipe 20 Refrigerant pump 21 Gas pipe 22 Heating amount control valve 23 Cold / hot water pipe 24 Evaporator heat exchanger 25 Cooling water pipe 26 Cooling water pump 27 Absorber heat exchanger 28 Condenser heat exchanger 29 Refrigerant bypass pipe 30 Refrigerant liquid Reservoir 31 Absorbent liquid reservoir 32 Open / close valve 33 Absorbent liquid bypass pipe 34 Open / close valve 35 Refrigerant vapor bypass pipe 36 Open / close valve 37 Frequency converter 38-43 Temperature detecting means 44 Concentration detecting means 50 Control device 51 Input means 52 Central processing means 53 Storage means 54 Setting input means 55 Capacity control output means 56 External output means

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masahiro Furukawa 1 Otsukicho, Ashikaga-shi, Tochigi Sanyo Electric Air Conditioning Co., Ltd. F-term (reference) 3L093 AA05 BB11 BB22 CC01 CC03 DD06 DD08 EE02 EE14 EE25 GG02 GG07 HH06 HH12 LL03

Claims (5)

[Claims] A control device for an absorption refrigerator having a function of outputting a control signal for controlling the amount of heat supplied to a regenerator and a control signal for controlling a flow rate of cooling water supplied to an absorber and a condenser. A function for outputting a control signal for returning the flow rate of the cooling water to the rated flow rate when the temperature of the diluted absorption liquid becomes equal to or higher than a predetermined temperature while outputting the control signal for limiting the flow rate of the cooling water to less than the rated flow rate. A control device for an absorption refrigerator. 2. A control device for an absorption refrigerator having a function of outputting a control signal for controlling an amount of heat supplied to a regenerator and a control signal for controlling a flow rate of cooling water supplied to an absorber and a condenser. In, during the output of the control signal to limit the flow rate of the cooling water to less than the rated flow rate, the temperature of the regenerator is equal to or higher than a predetermined temperature,
A function to output a control signal to return the flow rate of the cooling water to the rated flow rate when the opening of the valve that controls the amount of heat supplied to the regenerator is equal to or less than the predetermined opening and the temperature of the diluted absorbing liquid is equal to or higher than the predetermined temperature. A control device for an absorption refrigerator. 3. A control device for an absorption refrigerator having a function of outputting a control signal for controlling the amount of heat supplied to a regenerator and a control signal for controlling a flow rate of cooling water supplied to an absorber and a condenser. Has a function of outputting a control signal for returning the flow rate of the cooling water to the rated flow rate when the concentration of the absorbing liquid of the concentrated absorbing liquid becomes equal to or higher than a predetermined concentration while outputting the control signal for limiting the flow rate of the cooling water to less than the rated flow rate. A control device for an absorption refrigerator. 4. A control device for an absorption refrigerator having a function of outputting a control signal for controlling the amount of heat supplied to a regenerator and a control signal for controlling a flow rate of cooling water supplied to an absorber and a condenser. In the output of the control signal for limiting the flow rate of the cooling water to less than the rated flow rate, while the temperature of the regenerator is equal to or higher than a predetermined temperature,
When the opening of the valve that controls the amount of heat supplied to the regenerator is equal to or less than the predetermined opening and the concentration of the concentrated absorbent is equal to or greater than the predetermined concentration, a function is provided for outputting a control signal that returns the flow rate of the cooling water to the rated flow rate. A control device for an absorption refrigerator. 5. A control device for an absorption refrigerator having a function of outputting a control signal for controlling the amount of heat supplied to a regenerator and a control signal for controlling a flow rate of cooling water supplied to an absorber and a condenser. In the output of the control signal to limit the flow rate of the cooling water to less than the rated flow rate, if the temperature of the cooling water discharged after finishing the cooling operation by the absorber or the condenser becomes higher than the predetermined temperature, the flow rate of the cooling water is rated A control device for an absorption refrigerator having a function of outputting a control signal for returning to a flow rate.