JP3418655B2 - Absorption cycle operation equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes an absorption cycle operating device in which an operating medium such as an absorption chiller / heater, an absorption chiller, and the like operates in an absorption cycle, and cooling water is supplied to the absorption cycle operating device. The present invention relates to an absorption cycle operation facility configured to include a cooling water supply device such as a cooling tower for supplying water, and configured to supply cold water from the absorption cycle operation device to a cold water supply target (general air conditioning equipment, industrial cold heat utilization equipment). It is a thing.

[0002]

2. Description of the Related Art A conventional construction of such absorption cycle operating equipment is shown in FIG. In the description, in order to facilitate this, the absorption chiller / heater 1 will be described as a representative of the absorption cycle operating device, and the cooling tower 2 will be described as a representative of the cooling water supply device. Now, as shown in FIG. 8, in the prior art, the equipment includes the cooling water circulation mechanism 4 between the cooling tower 2 and the absorber 3 provided in the absorption chiller-heater 1, and requires cold water. A cold water circulation mechanism 7 is provided between the cold water supply target 5 and the evaporator 6 provided in the absorption chiller-heater 1. Further, in order to cope with a sudden load change (change in cold heat consumption amount) in the cold water supply target 5, a cold water tank 8 as a kind of damper is provided in the cold water circulation mechanism 7, and the cold heat capacity in this mechanism 7 is provided. Was secured for a certain amount or more. further,
The absorption chiller / heater 1 is provided with a cooling water inlet temperature detection mechanism 10 for detecting the cooling water temperature of the cooling water device inlet portion 9, and based on the value detected by the detection mechanism 10, the cooling fan 11 provided in the cooling tower 2 The cooling water inlet temperature is controlled so as to reach a preset cooling water inlet setting temperature by changing the rotation speed. What performs such control,
Here, the cooling water inlet temperature control means 12 is called. On the other hand, the absorption chiller-heater 1 is provided with a chilled water outlet temperature detection mechanism 14 for detecting the chilled water temperature of the chilled water equipment outlet portion 13, and the detection mechanism 1
The amount of heat in the regenerator 15 is adjusted based on the detected value of No. 4 to control the cold water outlet temperature to the preset cold water outlet set temperature. A device that performs such control is called heating amount control means 16. here,
The specific function of the heating amount control means 16 is to increase the combustion amount of the burner provided in the regenerator 15 when the cold water outlet temperature is higher than the cold water outlet set temperature, and to increase the burner combustion amount when it is lower than the set temperature. To reduce. Further, as shown in FIG. 8, when the cold water tank 8 is provided, by changing the circulation amount of the cold water between the cold water supply target 5 and the cold water tank 8, the cooling load of the cold water supply target 5 can be reduced. To change,
I am prepared to deal with it.

[0003]

However, the above-mentioned conventional techniques have various problems as described below. 1. As described above, when the heating amount in the regenerator is changed by the heating amount control means, the response to cold water is slow even if the heating amount is increased or decreased. FIG. 9 shows changes in the capacity of the absorption chiller-heater with respect to changes in the input amount of the regenerator. In this figure, the horizontal axis represents time and the vertical axis represents the capacity of the absorption chiller-heater, and the change status of the input amount is shown along with each line (four examples are shown in the figure). As can be seen from these graphs, the cooling water inlet temperature is constant (32 ° C) and the cold water inlet temperature is constant (12.5 ° C), even though the capacity settles to the desired situation with respect to the change in the input amount. In addition, it takes a relatively long time of about 40 minutes. Therefore, with this control alone, the responsiveness is poor and the fluctuation range of the cold water outlet temperature becomes relatively large. The example described in 21 is the case of burner proportional control, and in the case of burner ON-OFF control, if the cold water set temperature is reached, the burner is OFF (combustion amount = 0), and the cold water set temperature is +2 to 3 ° C.
When the burner is turned ON (combustion amount = 100%), the responsiveness is similarly worse than in the above case and the fluctuation range of the chilled water outlet temperature becomes large, which is a problem. 3 Therefore, when such a control structure is adopted, conventionally, a cold water tank is required between the cold water supply target and the absorption chiller-heater, and the cold water tank is provided between the cold water tank and the cold water supply target. A circulation amount adjusting mechanism for controlling the amount of cold water supplied from the tank to the cold water supply target (the bypass passage 610 and the three-way valve 620 in FIG. 8 and the control device 6 therefor).
30) is required, the equipment system is complicated, and the equipment cost and the operating cost are increased.

In view of the above situation, it is conceivable to use the cooling water described above in order to solve the problem of responsiveness to load fluctuations and the like. FIG. 10 shows changes in the cold water inlet temperature and the cold water outlet temperature in the absorption chiller-heater when the cooling water inlet temperature changes. In the figure, three forms are shown, the first form is one in which a cooling fan in a cooling tower is ON-OFF controlled (shown on the leftmost side in the same figure), and the second form is As shown by a broken line in FIG. 8, a cooling water circulation mechanism is provided with a bypass passage 61 provided with a two-way valve 62 (or a three-way valve), ON-OFF control is performed, and a cooling fan is continuously operated (the center of the figure). In the third embodiment, the two-way valve 62 (or the three-way valve) described above is controlled to open and close proportionally based on the difference between the cooling water inlet temperature and the cooling water inlet set temperature, and the cooling fan is continuously operated. It was operated (shown on the right side of the figure). From these results, it can be understood that the cooling water temperature can be controlled with almost no time lag if the inlet temperature control on the cooling water side is performed. However, as shown in FIG. 11, there is a limit to the change of the equipment capacity corresponding to the change of the cooling water inlet temperature.
FIG. 11 shows the cold water inlet temperature (which can correspond to the cold water outlet temperature) on the horizontal axis and the capacity on the vertical axis, and the change in capacity with the cooling water inlet temperature as a parameter can be read. That is, when the cold water inlet temperature is 12 ° C, the cooling water inlet temperature is 3
Even if it changes from 2 ℃ to 24 ℃, the capacity is 99%.
To only about 104%. Therefore, there is a limit to the control of the equipment capacity in accordance with the cooling water inlet temperature control, and further, as shown in FIG. 10, if the control is erroneous, the cooling water temperature changes abruptly due to the change of the cooling water temperature. Easy to cause.

Therefore, the object of the present invention was made in view of the above problems, and it is possible to respond relatively quickly to changes in the cooling load, to reduce changes in the cold water temperature, and to improve the absorption cycle operation device. It is to obtain an absorption cycle operation facility that does not necessarily require a cold water tank between the cold water supply target.

[0006]

[Means for Solving the Problems]

[Structure] A characteristic structure of an absorption cycle operation facility according to the present invention for achieving the above object is to provide an absorption cycle operation device having an absorber, an evaporator, and a regenerator, and a cooling water supply device capable of supplying cooling water. A cooling water circulation mechanism is provided between the absorber and the cooling water, and a cooling water circulation mechanism is provided between the evaporator and the cold water supply target that requires cold water. Cooling water inlet temperature control means for controlling the cooling water inlet temperature, which is the temperature, to be a preset cooling water inlet set temperature, and cold water that is the cold water temperature at the cooling water equipment outlet portion in the absorption cycle operating device. In the absorption cycle operation equipment provided with a heating amount control means for adjusting the heating amount in the regenerator so that the outlet temperature becomes a preset cold water outlet set temperature, the cold water outlet temperature The cooling water inlet temperature setting means for adjusting the cooling water inlet temperature setting means, wherein the cooling water temperature setting means controls the current cooling water outlet temperature setting from the current cooling water outlet temperature setting means.
Adjustment by subtracting the temperature minus the predetermined control coefficient
Value and the current cooling water inlet set temperature
It is configured so that it is set as a set temperature of the cooling water inlet . [Operation] The control of the cold water temperature in the absorption cycle operation equipment of the present application is performed by the control by the heating amount control means provided in the absorption cycle operation device and the cooling water set temperature control means provided for the cooling water circulation mechanism. . Therefore, the temperature control of cold water can cope with the former capacity change of a relatively wide area width accompanied by regeneration in the regenerator, but there is almost no time lag for the slow response control and the capacity change of a relatively narrow area width. The latter control, which can be applied, is performed together, and it is possible to immediately respond to the fluctuation of the cold heat load, and it is possible to favorably suppress the temperature change of the cold water. The function of the cooling water set temperature control means is
Set the inlet temperature appropriately according to the condition of the cold water outlet temperature.
The setting is controlled, but the cold water outlet temperature and cold water outlet setting
Set a new cooling water inlet set temperature based on the difference from the temperature
By doing so, you can set an accurate set temperature with a relatively simple method.
Thus, the cold water outlet temperature can be controlled well. Where control
Generally, the coefficient is configured so that it can be changed, and the optimum value for the system is set.
Since it can be set by setting it, the change in the cold water outlet temperature can be suppressed to a small level.
It is possible to

[0007]

[0008] (Structure) characterizing feature of the absorption cycle operation equipment further application, the cooling water inlet temperature control means, operation of the cooling fan provided et the cooling water supply device for cooling the cooling water by heat exchange with the outside air It is configured to control or operate the circulation amount changing mechanism for changing the circulation amount of the cooling water in the cooling water circulating mechanism. [Operation] In the cooling water inlet temperature control means of this configuration, when adjusting the temperature of the cooling water, the cooling water temperature is controlled by controlling the rotation speed of the cooling fan (the temperature decreases or increases when the rotation speed increases). On the contrary, it is possible to control the cooling water temperature by controlling the circulation amount in the circulation amount changing mechanism (the temperature decreases by increasing the circulation amount or vice versa).

[Structure] A further characteristic structure of the absorption cycle operation equipment of the present application is that a cooling water outlet temperature detecting mechanism for detecting a cold water outlet temperature which is a temperature at a device outlet portion of the cold water is provided, and a heating amount control means is provided. The amount of heating in the regenerator is adjusted based on the detection result of the cold water outlet temperature detection mechanism, and the cooling water by the cooling water set temperature control means is adjusted with respect to the timing of adjusting the heating amount by the heating amount control means. That is, the adjustment timing of the inlet set temperature is delayed. [Operation] When this configuration is adopted, when the cold water outlet temperature decreases due to load fluctuations on the cold heat supply target side, for example, the amount of heat in the regenerator is decreased and the cooling water inlet temperature is increased. Although it is controlled by the heating amount control means, if the timing of adjusting the cooling water inlet set temperature by the cooling water set temperature control means is early and the change of the cooling water inlet temperature precedes, this response is fast, so that the outlet temperature of the cooling water changes accordingly. As the temperature rises, the heating operation in the regenerator becomes unnecessary, and heating cannot be performed well. Therefore, by delaying the latter control, it is possible to avoid the occurrence of the above problems. [Configuration] A further characteristic configuration of the absorption cycle operation equipment of the present application is that the control of the cooling water inlet temperature control means is proportional control to a controlled mechanism based on a difference between the cooling water inlet temperature and the cooling water inlet set temperature. Yes, the control of the heating amount control means is proportional control of the heating amount based on the difference between the cold water outlet temperature and the cold water outlet set temperature. [Operation] In the case of this configuration, the control of the cooling water inlet temperature control unit and the control of the heating amount control unit are both set to the proportional control configuration, so that the cold water outlet temperature It is possible to perform control with extremely little fluctuation .

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Absorption cycle operation facility 100 of the present application
Can be used not only for general air conditioning, but also for industrial fields that require cold heat (such as foods, plating solutions, and printing press roll roll cooling). Here, in general air conditioning, the load fluctuation of cold heat demand is small, and the fluctuation of chilled water temperature is not a problem in many cases.However, for applications such as industrial process cooling, there is a sudden load fluctuation, and the absorption cold temperature changes accordingly. The temperature of the cold water sent from the water machine 1 and the like is likely to change, which may cause a problem. Therefore, in this case, it can be particularly preferably applied. Therefore, the absorption cycle operation facility 100 of the present application,
Provided is a facility that can be stably operated without being affected by such a field in which the load fluctuation is large. The outline of the characteristic configuration will be described. In order to satisfy the demand for reducing the fluctuation range of the extracted cold water temperature, the regenerator 1 is based on the detected value of the cold water outlet temperature.
The heating amount in 5 is proportionally controlled, and the cooling water inlet temperature is also proportionally controlled. As a result, a constant temperature of cold water can be taken out even when there is a large load change. Hereinafter, they will be sequentially described.

[Equipment Configuration] An example of a system configuration of the absorption cycle operating equipment 100 of the present application is shown in FIG. The system includes a cooling tower 2 as a cooling water supply device and an absorption chiller / heater 1 as an absorption cycle operation device. Inside the absorption chiller / heater 1, a so-called absorber 3, evaporator 6, regenerator 15 and condenser 17 are provided,
The working medium operates in an absorption cycle. As described in the related art, the cooling water circulation mechanism 4 is provided between the cooling tower 2 and the absorber 3 provided in the absorption chiller-heater 1.
A cold water circulation mechanism 7 is provided between a cold water supply target 5 that requires cold water and an evaporator 6 provided in the absorption chiller-heater 1. Further, the absorption chiller / heater 1 is provided with a cooling water device inlet portion 9
The cooling water inlet temperature detection mechanism 10 for detecting the cooling water temperature of the cooling tower 2 is provided, and the three-way valve provided in the bypass passage 18 and the rotation speed control of the cooling fan 11 provided in the cooling tower 2 are based on the detection value by the detection mechanism 10. The cooling water inlet temperature control means 120 controls the opening degree of 19 to bring the cooling water inlet temperature to the preset cooling water inlet set temperature.
Prepared for 0. Here, the control in the cooling water inlet temperature control means 120 is mainly performed by controlling the rotation speed of the cooling fan 11 which is a controlled mechanism and the three-way valve 19.
Is a valve opening degree control for, and is proportional control based on the difference between the cooling water temperature and the cooling water inlet set temperature. Further, in the cooling water circulation mechanism 4, a mechanism for changing the circulation amount of the cooling water is called a circulation amount changing mechanism.

On the other hand, the absorption chiller-heater 1 is equipped with a chilled water outlet temperature detection mechanism 14 for detecting the chilled water temperature at the chilled water equipment outlet portion 13, and based on the value detected by this detection mechanism 14, the regenerator is regenerated. Adjust the heating amount at 15,
The control panel 20 is also equipped with a heating amount control means 160 that brings the cold water outlet temperature to a preset cold water outlet set temperature. Here, the control in the heating amount control means 160 is the heating amount control in the regenerator 15, and is the proportional control of the heating amount based on the difference between the cold water outlet temperature and the cold water outlet set temperature. That is, when the chilled water outlet temperature is higher than the chilled water outlet set temperature, the combustion amount of the burner 15a provided in the regenerator 15 is proportionally increased, and when the chilled water outlet temperature is lower than the set temperature.
The combustion amount of a is reduced proportionally.

Now, as shown in FIG. 1, in the system of the present application, a cooling water preset temperature control means 21 for adjusting the cooling water inlet preset temperature based on the cold water outlet temperature,
Similarly, it is provided in the control panel 20. That is, the cooling water set temperature control means 21 is configured to detect the current cold water outlet set temperature T
A new cooling water inlet set temperature is obtained by adding the adjusted value obtained by multiplying a subtraction value (T0-T) obtained by subtracting the cold water outlet temperature T from 0 by a predetermined control coefficient A and the current cooling water inlet set temperature t0. Set as t1. That is, the new set value t1 is as follows. t1 = t0 + A × (T0-T)

The above is the main device configuration and control configuration, but a more detailed configuration (including outside the proportional control range) will be summarized and described below. 1 Cold water outlet temperature control 1-1 Heating amount control means 1 based on the detected value of cold water outlet temperature
According to 60, when the chilled water outlet temperature is higher than the maximum set value, the burner 15a is set to the 100% combustion state which is the maximum capacity combustion state. When the temperature is within the set temperature range of the cold water outlet, the burner 15a is proportionally burned between 33% to 100% burning state. When the cold water outlet temperature is lower than the minimum set value, the burner 15a is set to the 33% combustion state which is the minimum capacity combustion state. When the cold water outlet temperature further decreases, the burner 15a is put into a non-combustion state (0% combustion state). 1-2 By the cooling water setting temperature control means 21 based on the detected value of the cooling water outlet temperature The cooling water inlet setting temperature t1 obtained by t1 = t0 + A * (T0-T) described above is set as a new setting temperature. repeat. That is, the control value Δx = A × (T0-T) is added to the current cooling water inlet set temperature t0 at each control timing. However, the upper and lower limit of Δx is ± 3 ° C, and the cold water outlet temperature T is the cold water outlet set temperature T0 + 1 ° C.
I will start from when it became. Here, the time interval between the respective control timings is configured to be changeable, and the control coefficient described above is also configured to be changeable. Δ
The reason why the upper and lower limits of x are set to ± 3 ° C. is that if the structure in which Δx is always added at every control timing is followed as it is, if the value becomes too large, operation becomes impossible. Further, the reason why the control start time is set to the cold water outlet set temperature T0 + 1 ° C. is that the difference between the cold water outlet set temperature and the cold water outlet temperature is large when the operation of the absorption chiller-hot water machine is started.

2. Cooling water inlet temperature control This cooling water inlet temperature control is performed by the cooling water inlet temperature control means 120 described above. Cooling water inlet temperature is higher than the maximum setting value Cooling fan ON, three-way valve bypass side fully closed Cooling water inlet temperature Cooling fan ON, three-way valve bypass side opening proportional control cooling water inlet Cooling fan ON when the temperature is lower than the minimum set value, fully open the three-way valve bypass side, and cooling fan OFF when the cooling water inlet temperature drops

By combining the combustion amount control and the cooling water temperature control with such a structure, it is possible to take out cold water at a constant temperature even when the load fluctuates rapidly. However, the heating amount control means 160 described above has the chilled water outlet temperature detecting mechanism 14
The cooling water outlet temperature is detected almost at the same time, and the heating amount in the regenerator 15 is adjusted on the basis of the detection result. The adjustment timing of the set temperature of the cooling water inlet is delayed.
This situation will be described with reference to FIG. In the figure, a
Is the timing when the load fluctuation occurs, and b is the timing when the detection mechanism 14 actually detects the load fluctuation.
Therefore, the control of the heating amount of the burner 15a is started at this point. However, changing the cooling water inlet set temperature is
It is started from a time point delayed by a certain time from this timing (time point c in FIG. 2). The reason for this is that when the cold water outlet temperature decreases due to load fluctuations, the combustion amount of the burner 15a is decreased and the cooling water inlet temperature is controlled to increase. Since it is fast, the outlet temperature of the cold water rises accordingly, and the combustion amount of the burner 15a does not change. As a result, a situation occurs in which the control cannot be performed well.

[Equipment Operation] Now, in the equipment having the above-mentioned configuration, the operation status when the cooling load changes (decreases or increases) will be described with reference to FIGS. 3, 4, 5, and 6. To do. 3 and 4 are examples when the refrigeration load is reduced, and FIGS. 5 and 6 are examples when the refrigeration load is increased. FIGS. 3 and 5 show the results with the control of the cooling water inlet set temperature as in the present application, and FIGS. 4 and 6 show the results with the conventional configuration without this control. In each drawing, the solid line indicates the cold water outlet temperature (the temperature scale corresponds to half of the figure), the broken line indicates the hot water boiler outlet temperature (the temperature scale is the same as the description) that corresponds to the cooling load, and the dashed-dotted line indicates the cooling water inlet temperature. (The temperature scale is the same as described)
Furthermore, the two-dot chain line indicates the regenerator outlet temperature (the temperature scale is twice the stated value). The operating condition setting in the absorption chiller-heater is: chilled water set temperature: 7 ° C, chilled water inlet / outlet temperature difference
It was operated at 5.5 ° C. and 100% capacity. Further, the cooling water inlet set temperature is 32 ° C. in the conventional configuration, and the initial set temperature is 32 ° C. in the present configuration.

Each situation will be described below. 1 When the cooling load is halved (90% → 50% load reduction) 1-1 Structure of the present application (cooling water inlet set temperature variable control + burner proportional control (Fig. 3)) Burner combustion amount decreases with cooling water outlet temperature decrease To do. or,
The cooling water inlet temperature rises with a time delay. The temperature drop of the cold water outlet is up to 6.1 ° C and the burner does not turn off.
Also, it takes about 10 minutes from the start of load fluctuation to the return to the cold water set temperature (7 ° C). 1-2 Conventional structure (Cooling water inlet set temperature constant control + burner proportional control (Fig. 4)) The burner combustion amount decreases as the cooling water outlet temperature decreases, but the load fluctuation speed is faster, so the cooling water temperature further decreases and the burner is turned off. (6 ° C). Even after the burner is turned off, the temperature drops to 5.5 ° C due to the influence of the dilution operation. At 6.5 ° C, the burner turns on, but the solution pump stopped, so once the temperature was 8 ° C.
Rises to about 70 ° C and stabilizes at 7 ℃. Here, it takes about 20 minutes for the system to reach a stable operating condition.

2 When the cooling load is doubled (50% → 9
(Increase load to 0%) 2-1 Structure of the present application (cooling water inlet set temperature variable control + burner proportional control (Fig. 5)) The burner combustion amount increases as the cooling water outlet temperature rises. or,
The cooling water temperature drops due to time delay. The temperature rise of the cold water outlet is up to 7.6 ° C, and it takes about 10 minutes to return to the cold water set temperature. 2-2 Conventional structure (Cooling water inlet set temperature constant control + burner proportional control (Fig. 6)) The burner combustion amount increases as the cooling water outlet temperature rises, but it rises to 8.7 ° C because the load fluctuation speed is fast. Again 7
It takes about 1 hour to reach around ℃.

As a result, responsiveness to load fluctuations is improved,
It can be seen that the operation is performed with the fluctuation of the cold water outlet temperature minimized.

By adopting the configuration of the present invention as described above, the following operating conditions can be realized. 1) It has become possible to provide stable cold water (set temperature ± 1 ° C) even with relatively large load fluctuations. 2) The cold water tank and the three-way valve for controlling the cold water temperature, which should be arranged on the cold water supply target side of this tank, are unnecessary. 3) When the load changes beyond the control range, a cold water tank is required, but the capacity is smaller than that of the conventional control cold water tank. 4) Space was saved because a cold water tank was unnecessary. 5) The cost is low because a cold water tank is not required.

[Another Embodiment] In the above embodiment, the heat source of the regenerator is an absorption chiller-heater which is a fuel gas such as city gas. Any one can be adopted. That is, the present application can be applied to an absorption refrigerator having a heat source of steam. further,
Although the cooling tower is exemplified as the cooling water supply device, any device may be used as long as it can supply the cooling water. Further, the cooling water inlet set temperature may be set by the following structure. That is, an outside air temperature detection sensor for detecting the outside air temperature around the equipment is attached, and the cooling water inlet set temperature is automatically set based on the value detected by this sensor. As an example, the configuration can be set as shown in the table below.

[0023]

[Table 1] Outside air Cooling water set temperature Winter 5 ℃ (15 ℃ or less) → 28 ℃ Summer 25 ℃ (15 ℃ or more) → 32 ℃

In this way, when the outside air temperature is low,
The efficiency (C.O.
P) good driving becomes possible. Further, when the structure of the present application is adopted, when the cooling tower is selected with a capacity of 1.5 to 2 times the normal capacity, the cooling water control range in the summer is widened.

The absorption cycle operation equipment described so far is provided with a cooling water set temperature control means, and by changing this set temperature, stable control of the chilled water temperature is realized. If the temperature condition of the cooling water is lowered as a result, against the increase of cooling heat load,
It can respond effectively. Therefore, separately from (or including) the above configuration, the cold water outlet temperature detection mechanism 14 for detecting the cold water outlet temperature is provided, and the cold water outlet temperature is determined based on the detection result of the cold water outlet temperature detection mechanism 14. When the temperature is higher than the set temperature of the cold water outlet, a cold heat supply amount increasing means (a cooling fan rotation speed increasing means, or a cooling fan rotation speed increasing means, or an increasing amount of cold heat transferred from the cooling water flowing in the cooling water circulation mechanism 4 to the working medium in the absorber 3 is increased If the cooling water circulation amount increasing means is provided, stabilization of the chilled water outlet temperature can be achieved from the same principle as before.

Further, in the above embodiment, the circulation control in the cooling water circulation mechanism is performed by using the three-way valve, but it may be performed by the two-way valve as shown in FIG.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a diagram showing a system configuration of absorption cycle operation equipment of the present application.

FIG. 2 is a timing explanatory diagram of burner control and cooling water setting inlet temperature control when the chilled water outlet temperature decreases.

FIG. 3 is a diagram showing an operating condition when the load is reduced in the equipment of the present application.

FIG. 4 is a diagram showing an operating condition when a load is reduced in conventional equipment.

FIG. 5 is a diagram showing an operating condition when the load is increased in the equipment of the present application.

FIG. 6 is a diagram showing an operating condition when the load is increased in the conventional equipment.

FIG. 7 is a diagram showing a system configuration in another mode of the absorption cycle operating equipment of the present application.

FIG. 8 is a diagram showing a system configuration of a conventional absorption cycle operation facility.

FIG. 9 is a diagram showing a change in capacity of the absorption chiller-heater when input is changed.

FIG. 10 is a diagram showing changes in the chilled water outlet temperature when accompanied by cooling water inlet temperature control.

FIG. 11 is a diagram showing how the capacity of the absorption chiller / heater changes when the cooling water inlet temperature changes.

[Explanation of symbols]

1 Absorption cycle operation device (absorption chiller / heater) 2 Cooling water supply device (cooling tower) 3 absorber 4 Cooling water circulation mechanism 5 Cold water supply target 6 evaporator 7 Cold water circulation mechanism 9 Cooling water equipment entrance site 11 Cooling fan 13 Cold water equipment outlet 14 Cold water outlet temperature detection mechanism 15 regenerator 15a burner 21 Cooling water set temperature control means 120 Cooling water inlet temperature control means 160 Heating amount control means

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Nao Nagashima 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Within Osaka Gas Co., Ltd. (56) Reference JP-A-7-260284 (JP, A) Kaihei 7-19654 (JP, A) JP-A-7-218016 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 15/00 306

Claims (4)

(57) [Claims] 1. A cooling water supply device (2) capable of supplying cooling water and the absorption cycle operation device (1) comprising an absorber (3), an evaporator (6) and a regenerator (15), and the absorption. The cooling water circulation mechanism (4) is provided between the evaporator (3) and the cold water circulation mechanism (7) provided between the cold water supply target (5) requiring cold water and the evaporator (6). Cooling water inlet temperature control means for controlling the cooling water inlet temperature, which is the cooling water temperature of the cooling water device inlet portion (9) in the operating device (1), to be a preset cooling water inlet temperature ( 120) and the regenerator (15) so that the chilled water outlet temperature, which is the chilled water temperature of the chilled water device outlet portion (13) in the absorption cycle operating device (1), becomes a preset chilled water outlet set temperature. ) And a heating amount control means (160) for adjusting the heating amount in A e was absorbed cycling equipment, cooling water temperature setting control means for the adjusting the cooling water inlet temperature setting (t) based on the coolant outlet temperature (T) (21)
The cooling water setting temperature control means (21) subtracts a subtraction value (T) obtained by subtracting the cooling water outlet temperature from the current cooling water outlet setting temperature.
0-T) multiplied by a predetermined control coefficient A, and an addition value of the current cooling water inlet set temperature (t0) as a new cooling water inlet set temperature (t1) absorption cycle operation Facility. 2. The cooling water inlet temperature control means (120)
But the operation control of the cooling water supply device (2) to comprise al cooling fan that cools the cooling water by heat exchange with the outside air (11), or, in the cooling to the cooling water circulation mechanism (4) It controls the operation of the circulation amount change mechanism for changing the amount of circulating water according to claim 1 Symbol placement absorption cycle operation equipment. 3. A cold water outlet temperature detecting mechanism (14) for detecting a cold water outlet temperature which is a temperature at an equipment outlet portion (13) of the cold water, and the heating amount control means (160) comprises the cold water. Based on the detection result of the outlet temperature detection mechanism (14), the regenerator (1
5) for adjusting the heating amount, wherein the cooling water set temperature control means (21) controls the cooling water at the heating amount control timing (b) of the heating amount control means (160). The absorption cycle operating equipment according to claim 1 or 2 , wherein the adjustment timing (c) of the inlet set temperature is delayed. Control according to claim 4, wherein the cooling water inlet temperature control means (21), wherein a proportional control of the cooling water inlet temperature to the control mechanism based on the difference between the cooling water inlet temperature setting, the heating amount control means (160) control of the absorption cycle operation installation according to any one of claims 1 to 3, which is a heating amount of the proportional control based on the difference between the coolant outlet temperature and the coolant outlet temperature setting.