JP2994791B2 - Unit control device for absorption chillers - Google Patents

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 (including an absorption chiller / heater), and more particularly to a control device for controlling the number of absorption refrigerators for controlling the start and stop of a plurality of absorption refrigerators. .

[0002]

2. Description of the Related Art For example, Japanese Unexamined Patent Publication No. Sho 60-133277 discloses a control amount detecting means for detecting a temperature or an external load at a cold or hot water inlet or a cold or hot water outlet by combining a plurality of absorption refrigerators and cold / hot water heaters. The number control means inputs a signal from the control amount detection means and outputs a stop signal of supply of heat energy to any one of the absorption refrigerators / water heaters to be controlled, and its operation mode And, depending on the control amount, sequentially output a stop signal to the absorption chiller / chiller / heater of another control target, and change the number of operating units and the operation mode according to the temperature of the chilled / hot water or the load. An apparatus for controlling the number of absorption chillers / cooling / heating water machines is disclosed.

[0003]

As described above, the number of absorption chillers and chilled / hot water heaters is controlled, and the load is evaluated, for example, every time the chilled / hot water outlet temperature changes by, for example, 1 ° C. When the number control means sequentially outputs stop signals at short intervals when the temperature is lower than the set value (predetermined temperature), the absorption chiller / cooled / hot water machine is operated from the stop of supply of heat energy until the capacity is actually reduced. Since it takes time due to the nature of the equipment,
Over-control occurs, and then the capacity drops excessively, and there is a risk that the cold / hot water outlet temperature may not be stabilized at the set value.

[0004] Further, each time the temperature of the outlet of the hot and cold water changes, for example, by 1 ° C., the time at which the temperature changes by 1 ° C. is measured to determine the rate of change of the temperature, and the difference from the set value is evaluated every 1 ° C. If the operating number of absorption chiller / heater is determined based on the change rate and the deviation, for example, during the cooling operation, if the change rate is small even when the chilled water outlet temperature is higher than the set value, the number of operating the absorption chiller / heater is And the chilled water outlet temperature may be stabilized at a temperature higher than the set value. Also, in the heating operation, if the rate of change is small even when the hot water outlet temperature is lower than the set value, the number of operating absorption chiller / water heaters does not change, and the hot water outlet temperature may be stabilized at a temperature lower than the set value. was there.

An object of the present invention is to accurately control the number of absorption chillers and stabilize the outlet temperature of cold or hot water near a set value.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to an absorption type refrigerator number control apparatus for controlling the number of operating a plurality of absorption type refrigerators in accordance with the amount of load. A capacity calculating device (microprocessor) 43 for calculating an increase / decrease amount of the capacity of the absorption refrigerator at predetermined time intervals from a change rate of the outlet temperature of the cold water or hot water from the refrigerator and a deviation from the set value; A storage device 46 for storing the increase / decrease amount of the capacity, an arithmetic device 47 for subtracting the increase / decrease amount of the capability stored in the storage device 46 from the calculated increase / decrease amount of the capability, and a calculation device 47 An operation control device 48 that outputs a start / stop signal to the absorption refrigerator according to the difference between the calculated increase and decrease amounts. To stabilize .

Also, the rate of change of the outlet temperature of the cold or hot water,
Fuzzy inference based on deviation from set values, membership functions and fuzzy rules to calculate the amount of increase or decrease in the capacity of the absorption refrigerator at predetermined time intervals. An apparatus is provided for calculating the amount of increase or decrease in capacity based on human experience to stabilize the outlet temperature of cold or hot water near a set value.

[0008] Further, the sign of the change in the capacity stored in the storage device 46 is compared with the sign of the calculated change in the ability, and when the sign is reversed, the change in the change stored in the storage device 46 is calculated. A conversion device 50 for storing the calculated capacity increase / decrease amount in the storage device 46, and a storage device 46;
And an operation control device 48 that outputs a start / stop signal to the absorption refrigerator according to the increase / decrease amount stored in the storage device. And to stabilize the outlet temperature of the cold water or hot water near the set value.

[0009]

During operation of the absorption chiller, the chilled water outlet temperature deviation or the chilled water outlet temperature change rate changes, and the capacity increase / decrease amount stored in the storage device 46 is calculated from the capacity increase / decrease amount calculated by the capacity calculation device 43. Is subtracted by the arithmetic unit 47, and when the difference between the increase and decrease calculated by the arithmetic unit 47 exceeds a predetermined value, the operation control unit 48 outputs an operation signal to the stopped absorption chiller A, and the number of operating units is Since the number of units operated is increased based on the difference between the increase and decrease calculated by the arithmetic unit 47, the number of operating units is prevented from greatly changing in a short time, and the chilled water outlet temperature is stabilized near the set value. Becomes possible.

[0010] Also, when the amount of increase or decrease in capacity is fuzzy inferred by the microprocessor 43, and the number of operating absorption chillers is changed according to the amount of increase or decrease in capacity calculated based on human experience, the load changes. Further, it is possible to further stabilize the cold water outlet temperature near the set value.

Further, when the sign of the increase / decrease amount calculated by the microprocessor 43 is inverted from the sign of the increase / decrease amount stored in the storage device 46, the increase / decrease amount calculated by the operation of the converter 50 is stored in the storage device. The operation is switched to the increase / decrease amount stored in 46 and stored in the storage device 46, and the operation control device 48 outputs a start / stop signal in accordance with the increase / decrease amount.
By avoiding a drastic change in the capacity increase / decrease when the sign of the increase / decrease is reversed, it is possible to prevent a drastic increase / decrease in the number of machines in operation and properly control the number of machines in operation to bring the chilled water outlet temperature close to the set value. It becomes possible to be stable.

[0012]

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

FIG. 2 shows a double-effect absorption refrigerator using water as a refrigerant and an aqueous solution of lithium bromide (LiBr) as an absorbent (solution). Reference numeral 1 denotes a high-temperature generator (high-temperature regenerator) equipped with a burner 1B. ), 2A is an upper body, 2 is a low temperature generator, 3 is a condenser, 4A is a lower body, 4 is an evaporator, 5 is an absorber, 6 is an absorbent pump, and 7 and 8 are a low temperature heat exchanger and a high temperature respectively. Heat exchanger, 10 is a diluted absorbent pipe, 11 is an intermediate absorbent pipe, 12
Is a concentrated absorbent pipe, 13 is a refrigerant pipe, 13a is an on-off valve, 1
3B is a lower body 4A from the inlet side of the on-off valve 13a of the refrigerant pipe 13.
, A reference numeral 13b denotes an on-off valve, a reference numeral 14 denotes a refrigerant liquid flow down pipe, and a reference numeral 15 denotes a refrigerant liquid circulation pipe, each of which is connected as shown in FIG. And the refrigerant liquid circulation pipe 15
A refrigerant pump 15P is provided in the middle of the process. Also, 16
Reference numeral denotes a fuel supply pipe connected to the burner 1B. A fuel control valve (heating amount control valve) 17
Is provided. Reference numeral 21 denotes an evaporator heat exchanger, and reference numeral 22 denotes a cooling water pipe. Then, for example, the first absorption refrigerator A of 30 refrigeration tons (hereinafter referred to as Rt) configured as described above, and the second absorption refrigerator of 30Rt configured similarly to the first absorption refrigerator A, for example. A refrigerator B, for example, a third absorption refrigerator C of 40 Rt and a fourth absorption refrigerator D, for example, a fifth absorption refrigerator E of 60 Rt are connected by piping as shown in FIG.

In FIG. 3, 25 is a cold / hot water pipe, 26 is a pump provided in the cold / hot water pipe 25, 27 is an inlet header,
Reference numerals 28, 29, 30, 31, and 32 denote cold and hot moisture pipes, respectively. Reference numerals 33, 34, 35, 36 and 37 denote cold / hot water outflow pipes, 37A denotes an outlet side header, and 37B denotes a cold / hot water supply pipe.

Reference numeral 38 denotes a microcomputer control panel of the absorption refrigerator,
0 is a cold / hot water outlet temperature detector attached to the outlet side header 36; 41 is an outside air temperature detector;
1 and the chilled water outlet temperature detector 40 are connected to the microcomputer control panel 38.

Hereinafter, the microcomputer control panel 38 will be described. Reference numeral 42 shown in FIG. 1 is a change rate and deviation calculation device (hereinafter referred to as a first calculation device).
Input data of the chilled water outlet temperature from the chilled water outlet temperature detector 40 every predetermined time (for example, 10 seconds), and based on the data one minute before and the input data, the rate of change of the chilled water outlet temperature (° C./min) Is calculated. Further, the first arithmetic unit 42 calculates a difference between the chilled water outlet temperature and the set temperature (for example, 7 ° C.), that is, a deviation of the detected temperature from the set temperature.

Reference numeral 43 denotes a microprocessor (capacity operation device) for executing fuzzy inference at predetermined time intervals, similarly to the first arithmetic unit 42. This microprocessor 43 includes a fuzzy inference processor 44 and a control rule storage device 45.
It is composed of The fuzzy inference processor 44 uses the chilled water outlet temperature deviation and the chilled water outlet temperature change rate,
Based on the membership function and the fuzzy rule stored in the storage device 45, the amount of increase or decrease in the capacity of the absorption refrigerator is calculated. In the storage device 45, a membership function for qualitatively evaluating the chilled water outlet temperature deviation, that is, FIG.
Fuzzy variables PB (PositiveBig: positively large), PS (Po
passive Small: very small, ZR (Zer
o: Zero), NS (Negative Small: Negatively small), NB (Negative Big: Negatively large), qualitatively evaluate the membership function (membership function of the antecedent part) and the chilled water outlet temperature change rate Fuzzy variables PB, PS, ZR, N with respect to the rate of change defined as shown in FIG.
Membership function of S, NB (member of antecedent
Ship function) is stored.

The storage device 45 stores a matrix-like control rule between the chilled water outlet temperature deviation, the chilled water outlet temperature change rate, and the increase / decrease amount of the capacity shown in FIG. 6 defined based on human experience. Fuzzy rules) are stored.
Further, the storage device 45 stores fuzzy variables PB, PS, ZR, NS, NB with respect to the amount of increase or decrease in the ability shown in FIG.
(Membership function of the consequent part) is stored.

Furthermore, the storage device 45 has a membership function for qualitatively evaluating the hot water outlet temperature deviation, that is, fuzzy variables PB, P defined as shown in FIG.
The membership functions of S, ZR, NS, and NB (the membership functions of the antecedent part) and the membership functions for qualitatively evaluating the rate of change in the temperature of the hot water outlet, that is, FIG.
Fuzzy variables PB, PS, Z defined as shown in
R, NS, NB membership functions (membership functions of the antecedent part), and hot water outlet temperature deviation and hot water outlet temperature change rate and increase / decrease of capacity shown in FIG. 9 defined based on human experience A matrix-like fuzzy rule between quantities is stored.

Reference numeral 46 denotes a storage device for storing the increase / decrease amount, and 47 denotes a calculation device for the increase / decrease amount (hereinafter referred to as a second calculation device).
The second arithmetic unit 47 inputs the increase / decrease amount from the microprocessor 43, inputs the increase / decrease amount stored in the storage device 46, and calculates the increase / decrease amount stored in the storage device 46 from the increase / decrease amount input from the microprocessor 43. Is subtracted and output. The storage device 46 stores the increase / decrease amount that has been increased / decreased due to the previous start / stop of the absorption refrigerator, and outputs the increase / decrease amount stored at the time of calculating the next increase / decrease amount.

Reference numeral 48 denotes an operation control device of the absorption refrigerator, which inputs an increase / decrease amount from the second arithmetic unit 47 and receives the absorption refrigerators A, B, C,
A start / stop signal is output to D. Here, the operation control device 48
Outputs an operation signal to the corresponding absorption refrigerator when the increase / decrease (%) is equal to or more than a predetermined value, and outputs a stop signal to the corresponding absorption refrigerator when the increase / decrease is below the predetermined value. Is output. Reference numeral 50 denotes a conversion device. The conversion device 50 compares the sign of the increase / decrease amount calculated by the microprocessor 43 with the sign of the increase / decrease amount stored in the storage device 46, and reverses the sign (positive or negative). In some cases, the calculated increase or decrease is output to the storage device 46, and the newly calculated increase or decrease is stored in the storage device 46.

Hereinafter, the operation of the above-described apparatus for controlling the number of absorption chillers will be described.

For example, during the operation of cooling water supply (at the time of cooling operation), the on-off valve 13a of the absorption refrigerator A is opened, the on-off valve 13b is closed, the burner 1B is burned, and the absorption liquid pump 6 and the refrigerant pump 15P are operated. It is operated, and the absorbing liquid and the refrigerant circulate similarly to the conventional absorption refrigerator. Then, the refrigerant liquid is sprayed to the evaporator heat exchanger 21 by the evaporator 4, and cold water whose temperature has been reduced by the evaporator heat exchanger 21 is supplied to the load.
The other absorption chillers B, C, D and E are stopped.

During the cooling operation, the set value of the chilled water outlet temperature is, for example, 7.0 ° C., and the temperature detected by the chilled / hot water outlet temperature detector 40, ie, the chilled water outlet temperature is 10.0 ° C. 10. The chilled water outlet temperature at the time of reading the previous data
When the temperature is 2 ° C., the amount of increase or decrease is calculated as follows. Here, the refrigerating capacity of each of the absorption-type water heaters A, B, C, D and E is 30Rt, 30Rt,
40Rt, 40Rt and 60Rt, and the capacity ratios to the entire refrigeration capacity are 15%, 15%, 20%,
20% and 30%. In addition, each absorption chiller / heater A,
B, C, D, and E are rotated during operation, but the rotation of the absorption-type water heater / heater B is performed in the following order.

If the chilled water outlet temperature is 10.0 ° C. and the chilled water outlet temperature before the predetermined time is 10.2 ° C., the first arithmetic unit 42 calculates the chilled water outlet temperature deviation and the chilled water outlet temperature change rate, and Outlet temperature deviation is 10.0-7.0 = 3.0
(° C), the rate of change in the temperature of the cold water outlet is 10.0-10.2 =-
0.2 (° C./min).

The above-mentioned chilled water outlet temperature deviation and chilled water outlet temperature change rate are given to the microprocessor 43, using the fuzzy rule shown in FIG. 6 and the membership functions shown in FIGS. 4, 5 and 10. Fuzzy inference is performed. Then, according to the membership function of the chilled water outlet temperature deviation shown in FIG. 4, the membership value (value of the antecedent) NB = 0, NS = 0, ZR =
0, PS = 0.5, and PB = 0.65. or,
According to the membership function of the rate of change of the chilled water outlet temperature shown in FIG. 5, the membership values (values of the antecedent) NB = 0, NS = 1, ZR = 0.3 as shown in FIG.
3, PS = 0 and PB = 0.

When each of the above values is applied to the fuzzy rule in FIG. 6, the result becomes as shown in FIG.
In the MAX calculation method, a smaller value is taken at the intersection of the chilled water outlet temperature deviation and the chilled water outlet temperature change rate. For example, when the chilled water outlet temperature deviation is PB: the value of the antecedent when the chilled water outlet temperature deviation is positive is 0.65, and when the chilled water outlet temperature change rate is NS: the value of the antecedent is negatively small is 1.0. Ability increase / decrease is P
S: The antecedent when it is very small is 0.6.

Next, the increase / decrease amount of the driving ability is obtained as follows by the values shown in FIG. 13 and the membership function in the consequent part of FIG.

[0029]

(Equation 1)

The increase / decrease amount when the fuzzy variable is PS is a large value of 1 in the MIN / MAX calculation method.
9.5 is selected. And the fuzzy variable is Z
From the value of the increase / decrease amount at the time of R, PS, PM,

[0031]

(Equation 2)

## EQU1 ##

The value of 26.6% of the amount of increase or decrease is
7 is output. In the second arithmetic unit 47, the amount of increase or decrease from the microprocessor 43 is input and the storage unit 46 is used.
From the previous change amount, and the previous change amount is, for example, 15
%, The previous change is subtracted from the current change.

[0034]

(Equation 3)

## EQU1 ## The second arithmetic unit 47 outputs this increase / decrease amount to the operation control unit 48. Further, this increase / decrease amount is stored in the storage device 46, and is used when calculating the next increase / decrease amount.

If the increase / decrease amount is 11.6% and the order in which the second absorption chiller B is started next is 15%.
Since%> 11.6%, the operation control device 48 does not output an operation signal to the absorption refrigerator A, and the absorption refrigerator does not start operation. When the increase / decrease amount is, for example, 16.6%, if the absorption refrigerator to be started next is, for example, the absorption refrigerator B, and the capacity ratio is smaller than 16.6% of the increase / decrease amount, the absorption refrigerator B is to start.

The chilled water load is reduced, for example, and the chilled water outlet temperature is, for example, 6.6 ° C. At that time, if the chilled water outlet temperature before the predetermined time is 6.9 ° C., the first arithmetic unit 42 The outlet temperature deviation and the chilled water outlet temperature change rate are calculated, and the respective values are −0.4 ° C. and −0.3 ° C. These values are provided to the microprocessor 43 and fuzzy inference is performed.

As shown in FIGS. 14 and 15, the members of the chilled water outlet temperature deviation and the chilled water outlet temperature change rate are shown in FIG.
The ship value (value of the antecedent) is determined.

When each of the above values is applied to the fuzzy rule, the MIN / MAX operation method is as shown in FIG.

Next, the increase / decrease amount of the driving ability is obtained as follows by the values shown in FIG. 16 and the membership function of the consequent part shown in FIG.

[0041]

(Equation 4)

As for the amount of increase or decrease when the fuzzy variable is NM, -24% of a value having a large absolute value is selected.
And the amount of change

[0043]

(Equation 5)

Is as follows.

The amount of increase / decrease obtained as described above is output to the second arithmetic unit 47. The arithmetic unit 47 inputs the increase / decrease amount from the microprocessor 43,
Enter the previous increase / decrease amount. Then, if the previously calculated increase / decrease amount is, for example, 5%, and the sign of the increase / decrease amount is inverted, the conversion device 50 operates to reset the previous increase / decrease amount, and the second arithmetic unit 47 performs −42% Outputs the increase or decrease of. Further, this increase / decrease amount is stored in the storage device 46.

Thereafter, in the same manner as described above, the chilled water outlet temperature deviation and the chilled water outlet temperature change rate are calculated at predetermined time intervals, fuzzy inference is performed, and the amount of increase or decrease is calculated. , A real increase / decrease amount is obtained, and the start / stop of the absorption chillers A, B, C, D, and E is controlled by the increase / decrease amount, and the number of operating units changes according to the load.

When supplying hot water from the absorption refrigerators A, B, C, D and E to the load (during heating operation), the on-off valve 13a of the absorption refrigerator A shown in FIG. Is closed, and the on-off valve 13b is opened. The refrigerant vapor separated from the absorbent by the high-temperature generator 1 is supplied to the refrigerant vapor pipe 13.
B, the hot water which has been sent to the lower body 4A and heated by the refrigerant vapor in the evaporator heat exchanger 21 to increase the temperature is supplied to the evaporator 4A.
Spill out of. When the absorption chillers B, C, D and E are operated, the operation is the same as that of the absorption chiller A, and hot water flows out of the evaporator.

When supplying hot water, for example, the absorption refrigerator A is operating, the set value of the hot water outlet temperature is 55.0 ° C., the hot water outlet temperature is, for example, 55.6 ° C. When the hot water outlet temperature at the time is, for example, 55.3 ° C., the first arithmetic unit 42 calculates the hot water outlet temperature deviation and the hot water outlet temperature change rate, and the hot water outlet temperature deviation is 55.6-5.
5.0 = 0.6 ° C., and the hot water outlet temperature change rate is 0.3 ° C. The hot water outlet temperature deviation and the hot water outlet temperature change rate are given to the microprocessor 43, and fuzzy inference is performed as in the case of supplying cold water. Then, as shown in FIG. 17, the membership value NB = 0, NS = 0, ZR =
0.6, PS = 0.4, PB = 0. Also, as shown in FIG. 18, the membership value NB = 0. NS
= 0, ZR = 0, PS = 0.75, PB = 0.25.

When each of the above values is applied to the fuzzy rule in the figure, the result is as shown in FIG.
In the MAX calculation method, a smaller value is taken at the intersection of the hot water outlet temperature deviation and the hot water outlet temperature change rate. Then, the increase / decrease amount of the driving ability is obtained as follows by the values shown in FIG. 19 and the membership function of the consequent part of FIG.

[0050]

(Equation 6)

As for the amount of increase or decrease when the fuzzy variable is NM, -24% of a large value is selected. And
Increase or decrease

[0052]

(Equation 7)

Is obtained.

The amount of increase / decrease obtained as described above is output to the arithmetic unit 47. The arithmetic unit 47 inputs the increase / decrease amount from the microprocessor 43 and the previous increase / decrease amount from the storage device 45. When the previous increase / decrease amount stored in the storage device 45 is, for example, −20%,
The arithmetic unit 47 subtracts the previous increase / decrease amount from the current increase / decrease amount.

[0055]

(Equation 8)

Is obtained. The arithmetic unit 47 outputs the increase / decrease amount to the operation control unit 48.

Then, assuming that the increase / decrease amount is -22% and the order in which the first absorption refrigerator A is stopped next is | -2
Since 2 |%> 15.0%, the operation control device 48 outputs a stop signal to the absorption chiller A, and the absorption chiller stops.

Thereafter, the value obtained by subtracting the previous increase / decrease amount from the increase / decrease amount calculated by the microprocessor 43 is the same as when the absorption chiller is performing the chilled water supply operation. If the percentage of ability (increase or decrease) is greater than
The absorption refrigerator starts. If the value obtained by subtracting the previous increase / decrease amount from the increase / decrease amount calculated by the microprocessor 43 is negative and the absolute value of the value is equal to or greater than the ratio of the capacity of the absorption refrigerator to be stopped next, The absorption refrigerator stops.

According to the above embodiment, in controlling the number of operating a plurality of absorption chillers, the microprocessor 43 determines the predetermined time for the cooling water or hot water from the absorption chiller based on the deviation from the set value of the outlet temperature. The rate of increase / decrease of the capacity is calculated every time, the previous rate of change is subtracted from the rate of change by the second arithmetic unit 47, and the absolute value of the obtained value is the ratio of the capacity of the absorption refrigerator to be started or stopped next. In the above case, the absorption chiller is started or stopped, so that it is possible to perform the unit control according to the characteristic that it takes time from the start or stop of the absorption chiller to the change of the capacity, Thus, it is possible to optimally control the number of operating absorption chillers according to the load while avoiding a large change in the number of operating units, and to stabilize the outlet temperature of the cold or hot water near the set value.

Further, when obtaining the increase or decrease of the load from the deviation from the set value of the cold water or hot water and the rate of change, the increase or decrease can be calculated based on human experience using fuzzy inference. The start and stop of the machine can be accurately controlled using human experience, and even when there is a change in load or the like, a smoother control with less change in outlet temperature than before can be performed. The outlet temperature of the hot water can be further stabilized at the set temperature.

Further, when the amount of increase or decrease of the load calculated by the microprocessor 43 is switched from positive to negative or from negative to positive, the conversion device 50 operates and the storage device 45 operates.
Is replaced with the current increase / decrease amount, and the number of operating absorption chillers is directly controlled based on the current increase / decrease amount. The number of operating units can be changed gently according to the characteristics, and the number of operating units can be prevented from changing significantly due to drastic changes in the number of operating units. The set value can be quickly stabilized.

In the above-described embodiment, the number control device for controlling the number of operating five absorption chillers has been described. However, the number of controlled units is not limited to five. Even when controlling the number of operating absorption chillers such as four, four, six, etc., similar effects can be obtained by controlling as in the above embodiment.

The membership function and the fuzzy rule at the time of supplying cold water and hot water are not limited to those in the above embodiment, but are set according to the refrigerating capacity of each absorption refrigerator. .

In the above embodiment, when the sign of the amount of increase or decrease of the calculation result changes, the previous amount of increase or decrease is set to 0 (zero).
Although the number of operating units was changed based on the increase / decrease amount of the current (current) as a starting point, the rate of change of the outlet temperature of the cold water or hot water was changed to a predetermined temperature (for example, 0.3 minutes) for a predetermined time (for example, 10 minutes). ° C), or when the number of operating units does not change due to a change in the amount of increase or decrease for a predetermined time (for example, 30 minutes) or more, the previous amount of increase or decrease may be set to 0 and the current amount of increase or decrease may be used as a starting point.

Further, for a predetermined time (for example, one hour) or more,
If there is no increase or decrease in the number of operating units, one additional unit may be forcibly operated to control the number of units by forcibly changing the outlet temperature.

[0066]

According to the present invention, there is provided an apparatus for controlling the number of absorption chillers constructed as described above, wherein the capacity of an absorption chiller is increased or decreased based on a deviation from a set value of an outlet temperature of cold water or hot water and a rate of change. The amount is calculated by the capacity calculator, the previous change stored in the storage device is subtracted from the calculated change in the capacity, the difference between the changes is calculated by the calculator, and the absorption type is calculated according to the difference. Since the number of operating refrigerators is controlled, when the load changes, the operating number of absorption refrigerators can be prevented from changing in a short time, and the capacity can be prevented from fluctuating greatly. The number of units can be controlled in accordance with the characteristic of the absorption chiller that it takes time after the capacity is changed after the operation or stop, and the outlet temperature of the cold or hot water can be stabilized at the set value.

Also, when obtaining the amount of increase or decrease in the load, the amount of increase or decrease can be calculated based on human experience by using fuzzy inference, and the start and stop of the absorption refrigerator can be calculated using human experience. As a result, the outlet temperature of the cold or hot water can be further stabilized at the set temperature.

Further, when the sign of the increase / decrease amount of the ability obtained by the calculation in the arithmetic unit is reversed from the sign of the increase / decrease amount stored in the storage device, the conversion device operates and is stored in the storage device. The operation control unit controls the number of operating units based on the current increase / decrease amount by replacing the previous increase / decrease amount with the current increase / decrease amount, so that when the sign is reversed, avoid a drastic change in the number of operating units. Therefore, the outlet temperature can be quickly stabilized at the set temperature even when the capacity is gradually changed and the sign of the increase or decrease of the capacity is reversed.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a number control device.

FIG. 2 is a circuit configuration diagram of an absorption refrigerator.

FIG. 3 is a system configuration diagram of a number control device of absorption chillers.

FIG. 4 is an explanatory diagram showing a membership function of a chilled water outlet temperature deviation.

FIG. 5 is an explanatory diagram showing a membership function of a chilled water outlet temperature change rate.

FIG. 6 is an explanatory diagram showing control rules for a chilled water outlet temperature deviation and a chilled water outlet temperature change rate.

FIG. 7 is an explanatory diagram showing a membership function of a hot water outlet temperature deviation.

FIG. 8 is an explanatory diagram showing a membership function of a hot water outlet temperature change rate.

FIG. 9 is an explanatory diagram showing a control rule for a hot water outlet temperature deviation and a hot water outlet temperature change rate.

FIG. 10 is an explanatory diagram of a membership function of a consequent part at the time of supplying cold water and supplying hot water.

FIG. 11 is an explanatory diagram of fuzzy inference of the antecedent part when the chilled water outlet temperature deviation is 3.0 ° C.

FIG. 12 is an explanatory diagram of fuzzy inference of the antecedent part when the chilled water outlet temperature change rate is −0.2 ° C.

FIG. 13 is an explanatory diagram of fuzzy inference based on a control rule of a chilled water outlet temperature.

FIG. 14 is an explanatory diagram of fuzzy inference of the antecedent part when the chilled water outlet temperature deviation is −0.4 ° C.

FIG. 15 is an explanatory diagram of fuzzy inference of the antecedent part when the chilled water outlet temperature change rate is −0.3 ° C.

FIG. 16 is an explanatory diagram of fuzzy inference based on a control rule of a chilled water outlet temperature.

FIG. 17 is an explanatory diagram of fuzzy inference of the antecedent part when the hot water outlet temperature deviation is 0.6 ° C.

FIG. 18 is an explanatory diagram of fuzzy inference of the antecedent when the hot water outlet temperature change rate is 0.3 ° C.

FIG. 19 is an explanatory diagram of fuzzy inference based on a hot water outlet temperature control rule.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-temperature generator 2 Low-temperature generator 3 Condenser 4 Evaporator 5 Absorber 43 Microprocessor (capacity calculation device) 44 Fuzzy inference processor 45 Control rule storage device 46 Storage device 47 Calculation device 48 Operation control device A Absorption refrigerator

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tetsuro Kishimoto 2-18 Keihanhondori, Moriguchi City Sanyo Electric Co., Ltd. (56) References JP-A-59-95603 (JP, A) JP-A-63-131942 (JP, A) JP-A-4-3859 (JP, A) JP-A-4-32668 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25B 15/00 306

Claims (3)

(57) [Claims] 1. The number of absorption chillers for controlling a plurality of absorption chillers which form a refrigeration cycle by connecting an evaporator, an absorber, a regenerator, a condenser and the like in accordance with a load amount. In the control device, a capacity calculating device that calculates an increase / decrease amount of the capacity of the absorption refrigerator at predetermined time intervals from a change rate of the water outlet temperature from the absorption refrigerator and a deviation from the set value, A storage device for storing the increase / decrease amount, an arithmetic device for calculating the difference in the increase / decrease amount by subtracting the increase / decrease amount of the capability stored in the storage device from the calculated increase / decrease amount of the capability, and a calculation device for the increase / decrease amount calculated by the arithmetic device An operation control device for outputting a start / stop signal to the absorption refrigerator according to the difference. 2. The number of absorption chillers for controlling the number of operation of a plurality of absorption chillers in which a refrigeration cycle is formed by connecting an evaporator, an absorber, a regenerator, a condenser and the like in accordance with the amount of load. In the control device, the change rate of the water outlet temperature from the absorption chiller, the deviation from the set value, the fuzzy inference based on the membership function and the fuzzy rule, and the amount of increase or decrease in the capacity of the absorption chiller for a predetermined time. A capacity calculating device that calculates each time, a storage device that stores the amount of increase or decrease in the capacity calculated last time, and subtracting the amount of increase or decrease in the capacity stored in the storage device from the amount of increase or decrease in the calculated capacity to calculate the difference in the amount of increase or decrease An arithmetic unit for calculating, and an operation control unit for outputting a start / stop signal to the absorption chiller in accordance with the difference between the increase and decrease calculated by the arithmetic unit, . 3. The number of absorption chillers that control the number of operating a plurality of absorption chillers that form a refrigeration cycle by connecting an evaporator, an absorber, a regenerator, a condenser, etc., according to the load amount. In the control device, a capacity calculating device that calculates an increase / decrease amount of the capacity of the absorption refrigerator at predetermined time intervals from a change rate of the water outlet temperature from the absorption refrigerator and a deviation from the set value, The storage device for storing the increase / decrease amount is compared with the sign of the capability increase / decrease amount stored in this storage device and the calculated increase / decrease amount of the capability is stored in the storage device when each sign is inverted. A conversion device that replaces the increase / decrease amount with the calculated increase / decrease amount and stores the result in the storage device; and an operation control device that outputs a start / stop signal to the absorption refrigerator according to the increase / decrease amount stored in the storage device. An absorption refrigerator stand characterized by the following: Number control device.