JP3129684B2 - Method and apparatus for automatically blowing cooling water in absorption chiller / heater / absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can control the quality of cooling water circulated through an absorption chiller / heater or absorption chiller with high precision and efficiency by automatically controlling the blowing of concentrated cooling water. The present invention relates to a method and an apparatus for automatically blowing cooling water.

[0002]

2. Description of the Related Art Conventionally, absorption chiller / heaters and absorption chillers using, for example, lithium bromide as an absorbent and water as a refrigerant have been known. As an example of a configuration of such an absorption chiller / heater / absorption chiller, for example, an absorption chiller / heater, a configuration as shown in FIG. 8 is known. In the absorption chiller / heater shown in FIG. 8, the low-temperature regenerator 10, the condenser 12, the absorber 14, the evaporator 16, the high-temperature regenerator 18, the low-temperature heat exchanger 20, the high-temperature heat exchanger 22, and each of these devices are used. A diluting liquid in the absorber 14 is provided to the low-temperature regenerator 10 through a pipe 26, a low-temperature heat exchanger 20, and a pipe 28 by a low-temperature pump 24. The diluted liquid of the low-temperature regenerator 10 is supplied to the gas-liquid separator 3 of the high-temperature regenerator 18.
It is heated by the high-temperature refrigerant vapor flowing from 0 through the pipe 32 and concentrated to an intermediate concentration.

[0003] This intermediate concentration liquid is divided into two parts. One of the two halves of the liquid is supplied to high-temperature pump 34 via lines 36, 38,
The high-temperature heat exchanger 22 is sent to the high-temperature regenerator 18 via the pipe 40. The intermediate concentration liquid of the high temperature regenerator 18 is supplied to the combustion device 42
, Heats up the heat recovery unit 44, enters the gas-liquid separator 30, and is separated into refrigerant vapor and concentrated liquid. The concentrated liquid in the gas-liquid separator 30 is supplied to the pipe 46, the high-temperature heat exchanger 22, and the pipe 4
8 and mixed with the intermediate-concentration liquid from the pipe 50 (the other of the bisected intermediate-concentration liquids), and introduced into the low-temperature heat exchanger 20 as a mixed concentrated liquid. Spraying device 5
4 spreads the heat on the heat transfer tube of the absorber 14. On the other hand, the refrigerant vapor separated by the gas-liquid separator 30 enters the low-temperature regenerator 10 via the pipe line 32, where the liquid is heated and condensed and liquefied to enter the condenser 12. The refrigerant vapor generated when the rare liquid is concentrated to an intermediate concentration in the low-temperature regenerator 10 enters the condenser 12 and condenses, then enters the evaporator 16, and the condensed refrigerant water is piped by the refrigerant pump 56. Through the path 58, the spraying device 60 sprays the heat on the heat transfer tubes of the evaporator 16. Here, 62 is a combustion chamber, and 64 is an exhaust pipe.

[0004] When circulating cooling water in the absorber and condenser of the absorption chiller-heater having the above-described configuration, if the quality of the circulating cooling water decreases, dirt adheres to the heat transfer tubes and the like. This may lead to a decrease in the capacity of the absorption chiller / heater and an increase in fuel consumption, or in the worst case, a corrosion accident of the heat transfer tube or the like. Therefore, conventionally, as one of means for managing the quality of the cooling water circulated through the absorption chiller / heater or the absorption refrigerator, the concentrated cooling water is blown to prevent the deterioration of the cooling water quality due to overconcentration. That is being done.
For example, as shown in FIG. 6, the cooling water from the cooling tower 66 is supplied to an absorption chiller / heater 72 through a cooling water pipe 70 by a cooling water pump 68 and used for cooling in the chiller / heater 72. The cooling water is returned to the cooling tower 66 through the cooling water pipe 74. However, if the circulating cooling water is concentrated, the water quality may be reduced and the above-described problem may occur. The blow solenoid valve 78 of the blow pipe 76 connected to 70 is opened to blow the concentrated cooling water. Reference numeral 80 denotes an orifice attached to the blow pipe. Note that the amount of cooling water held in the cooling tower 66 is adjusted by the supply of water by operating a control valve 86 of a supply water pipe 84 connected to the ball tap 82 with the water surface detected by a ball tap (float) 82.

As a technique for controlling the blow of cooling water, as an example, as shown in FIG. 7, a sensor is attached to a cooling water blow pipe system, and the quality of the cooling water (for example, the conductivity of the cooling water). Is detected, and when the value becomes a predetermined value, the blow solenoid valve is opened to blow the cooling water. In addition, there is a correlation that the conductivity of the cooling water increases almost in proportion to the concentration of the cooling water and the deterioration of the water quality. 7, the sensor 90 is attached to the blow pipe 76 connected to the cooling water pipe 70 downstream of the blow solenoid valve 78 via a joint 88 so as to be in a bypass position. A control panel (operation panel) 91 periodically and short-time blow solenoid valve 78
The cooling water is allowed to flow through the sensor 90, and the conductivity of the cooling water is measured by the sensor 90. If the value exceeds a set value (in the case of conductivity, for example, 500 μS / cm), operation control is performed. Blow solenoid valve 78 by the panel (operation panel) 91
Is opened and the cooling water is blown. In FIG. 7, as an example, the orifice 80 for adjusting the flow rate of the blow pipe 76 is configured to be incorporated between the joints 92. 94 is a manual valve, 96 is a drain valve, and 98 is an inlet header. Further, Japanese Patent Laid-Open No. 5-33
No. 2631 discloses that in an absorption chiller / heater, cooling water is periodically blown by a blow pipe, and the quality of the blown cooling water is detected by a water quality detector provided downstream of the cooling water blow valve, and cooling is performed. A water quality management method for cooling water in which the blowing time is determined so that the water has a predetermined water quality or the blowing is continued until the cooling water has a predetermined water quality is described.

[0006]

However, in the blow control using a sensor as shown in FIG. 7, dirt easily adheres to the electrode surface of the sensor. For example, in the case of the conductivity, the value is displayed lower. When the actual conductivity is set to a value (standard is about 500 μS / cm, and a descent rate due to contamination is allowed up to 30%, about 650 μS / c
Even if it exceeds m), there is a problem that the cooling water is not blown and the scale adheres to the heat transfer tube and the like. As a countermeasure against such a problem, it is conceivable to periodically clean the sensor to remove dirt.However, even if the conductivity of the sensor electrode can be reduced to some extent due to dirt,
Maintenance must be performed periodically several times a year, and the work is complicated. In addition, a conductivity sensor having a dirt correction function using a multi-electrode or the like has been developed, but there is a problem that the cost is significantly increased. In addition, the cooling water blow by a general timer that is generally performed cannot perform high-precision blow control, so that extra blow is performed to increase the amount of makeup water used, and that the blow solenoid valve There is a problem that the concentration multiple of the cooling water greatly increases while the water is closed, and the water quality deteriorates.

The present invention has been made in view of the above points, and has as its object to control the quality of cooling water circulated through an absorption chiller / heater / absorption chiller by blowing concentrated cooling water. By calculating the theoretical blow interval (time when the blow solenoid valve is closed) and blow time (time when the blow solenoid valve is open) from the various data of the cooling water system and the operating conditions of the equipment, The cooling water blow can be automatically controlled by setting the concentration multiple of the circulating cooling water within a certain range without measuring the conductivity etc. using a sensor. An object of the present invention is to provide a method and an apparatus for automatically blowing cooling water, which prevent deterioration and require less consumption of makeup water, are easy to maintain, and are inexpensive.

[0008]

In order to achieve the above object, an automatic cooling water blowing method in an absorption chiller / heater / absorption chiller according to the present invention is directed to an absorption chiller / heater for cooling water cooled in a cooling tower. A method for preventing deterioration of the water quality due to the concentration of the circulating cooling water by blowing the circulating cooling water when circulating through the absorption chiller. The amount of cooling water circulated, the amount of cooling water retained in the cooling tower, the amount of evaporative water from the cooling tower (evaporation loss), the amount of water scattered from the cooling tower (scattering loss), the amount of cooling water blown and the absorption cold / hot water From the load conditions of the chiller / absorption chiller, calculate the cooling water blow interval (time when the blow solenoid valve is closed) and blow time (time when the blow solenoid valve is open) to calculate the cooling water Automatically controls blow It is characterized in that (Fig. 1,
(See FIG. 2).

In the method of the present invention, when the cooling water cooled in the cooling tower is circulated to the absorption chiller / heater / absorption chiller, the circulating cooling water is blown, thereby deteriorating the water quality due to the concentration of the circulating cooling water. The conductivity of make-up water to the cooling tower, the target conductivity of the circulating cooling water, the amount of cooling water circulated, the amount of cooling water held in the cooling tower, the amount of evaporating water from the cooling tower (evaporation). Loss), the amount of water scattered from the cooling tower (scattering loss), the amount of cooling water blown, and the load conditions of the absorption chiller / heater / absorption chiller, the concentration ratio of the circulating cooling water to the supply water to the cooling tower is within a certain range. It is characterized in that the cooling water blow is automatically controlled by calculating such a cooling water blow interval and blow time by calculation (see FIGS. 1 and 2).

The cooling water automatic blower in the absorption chiller / heater / absorption chiller of the present invention comprises a cooling water pipe for circulating the cooling water cooled in the cooling tower to the absorption chiller / heater / absorption chiller. A blow pipe having a solenoid valve is connected,
By operating this blow solenoid valve on the operation control panel to blow a part of the circulating cooling water, it is a device for preventing the deterioration of water quality due to the concentration of the circulating cooling water, the conductivity of the make-up water to the cooling tower, Target conductivity of circulating cooling water, cooling water circulation amount, cooling water holding amount in cooling tower, amount of evaporating water from cooling tower (evaporation loss), amount of water scattered from cooling tower (scattering loss),
A calculation device for calculating the cooling water blow interval and blow time from the cooling water blow amount and the load conditions of the absorption chiller / heater / absorption refrigerator is incorporated in the operation control panel, and the blow interval determined by the calculation device is used. The operation control panel is connected to the blow solenoid valve so that the blow solenoid valve is automatically operated according to the blow time and the concentration multiple of the circulating cooling water with respect to the makeup water to the cooling tower can be controlled within a certain range. (See FIGS. 1 and 2).

For example, when the change with time of the conductivity of the circulating cooling water (circulating water) is measured for the four cases shown in Table 1, the result shown in FIG. 3 is obtained. In cases A, B, and C in which the cooling water is not blown as it is, it can be seen that the circulating cooling water is concentrated over time, and the conductivity of the circulating cooling water increases in proportion thereto. In this case, the smaller the cooling tower, the higher the conductivity of the circulating cooling water, and therefore the higher the concentration multiple. Here, the concentration multiple is determined by the value of (conductivity of circulating cooling water) / (conductivity of makeup water to the cooling tower). On the other hand, in the same medium-sized cooling tower as in Case B, the blow interval (time when the blow solenoid valve is closed) is set to 10 hours,
In case D in which the cooling water is blown with the blow time (time during which the blow solenoid valve is open) set to 8 hours, the conductivity of the circulating cooling water increases when the blow solenoid valve is closed, but when the blow solenoid valve is open, The conductivity of the circulating cooling water has dropped,
It can be seen that the conductivity of the circulating cooling water changes within a certain range. In Table 1, the evaporation loss indicates the ratio of the amount of evaporating water to the amount of circulating cooling water, and the scatter loss similarly indicates the ratio of the amount of scattered water to the amount of circulating cooling water. The load condition uses the average opening of the fuel control valve, and the initial value is 100%. Note that α in FIG. 3 indicates a conductivity variation rate.

[0012]

[Table 1]

[0013]

Embodiments of the present invention will be described below in detail. 1 and 2 show an automatic cooling water blowing device in an absorption chiller / heater / absorption chiller according to an embodiment of the present invention. In the present embodiment, the cooling water from the cooling tower is circulated to the absorption chiller / heater, and a part of the circulating cooling water is blown from the blow pipe by the blow solenoid valve, but the structure of the present invention is not limited to this. It is not something to be done. As shown in FIG. 1, cooling water from a cooling tower 66 is supplied to an absorption chiller / heater 72 through a cooling water pipe 70 by a cooling water pump 68.
And is used for cooling in the chiller / heater 72, and then returned to the cooling tower 66 via the cooling water pipe 74. In this case, the cooling water inlet temperature Tm2 in the water heater 72 is, for example, 32 ° C., and the cooling water outlet temperature Tm1 is, for example,
37.5 ° C. Also, as an example of the configuration of the absorption chiller / heater, the configuration as shown in FIG. 8 described above is used.

The circulating cooling water is concentrated due to evaporation from the cooling tower 66 and the like, and the water quality deteriorates. Therefore, the theoretical blow interval (blow time) is determined from various data of the cooling water system and the load condition of the chiller / heater 72. The blow time (time when the blow solenoid valve is open) and the blow time (time when the blow solenoid valve is open) are calculated, and the blow solenoid valve of the blow pipe 76 connected to the cooling water pipe 70 is calculated according to the blow interval and blow time. 78 is controlled. Reference numeral 80 denotes an orifice attached to the blow pipe. Further, the amount of cooling water held in the cooling tower 66 is adjusted by the supply water by operating the control valve 86 of the supply water pipe 84 connected to the ball tap 82, the water surface being detected by the ball tap (float) 82. The flow rate can be adjusted using a throttle mechanism, a valve, or the like other than the orifice, and the amount of cooling water held can be adjusted by means other than water level control using a ball tap.

Next, a cooling water blow pipe system according to the present embodiment will be described. As shown in FIG. 2, a computing device 100 that computes a blow interval and a blow time from various data of a cooling water system and load conditions of the chiller / heater 72,
The blow control pipe 91 is connected to the cooling water pipe 70 in accordance with the calculated blow interval and blow time.
The sixth blow solenoid valve 78 is controlled.
In FIG. 2, as an example, the orifice 80 for adjusting the flow rate of the blow pipe 76 is configured to be incorporated between the joints 92.
It is also possible to adopt a configuration using another throttle mechanism or valve instead of the orifice. 94 is a manual valve, 96 is a drain valve, and 98 is an inlet header.

Subsequently, referring to FIGS. 1, 3 and the like,
An example of an arithmetic expression for obtaining the cooling water blow interval and blow time will be described. When SS is the target conductivity and 2α is the allowable conductivity width, the upper limit conductivity: S3 = SS * (1 + α / 100) The lower limit conductivity: S2 = SS * (1-α / 100) Blow amount: B = C ・ π√4 * (D / 1000) ∧2 * (2g * P * 10) ∧0.5 * T * 3600 = P∧0.5 * 0.024 * D∧2 ・ T [m ³ / h]…
(1) However, the orifice flow coefficient C is 0.6 and the orifice diameter is D. Evaporated water amount: E = (Tm1-Tm2) /600*Φ/100*L·T=0.00917*Φ/100*L·T [m ³ / h] (2) However, the cooling water outlet temperature Tm1 is 37. The cooling water inlet temperature Tm2 is set to 32 ° C. Spattering water amount: W = 0.1 / 100 * L · T = 0.001 * L · T [m ³ / h] (3) The scattering loss is assumed to be 0.1% of the cooling water circulation amount L. Makeup water volume: M = W + E + B = ((0.001L + 0.00917LΦ / 100) + P∧0.5 * 0.024 * D∧2) * T [m ³ / h]…
(4) An equation for calculating the conductivity Sa of the cooling water after a fixed time is as follows: S is the initial conductivity, and Sa = (S · GS · (W + B) −E + S1 · M) / G (G) 5) Substituting equations (1) to (4) into equation (5), Sa = (S · GS · (0.001L · T + P ∧ 0.5 * 0.024 * D ∧ 2 · T)-0.00917L · Φ / 100 ・ T + S1 ・ ((0.001L + 0.00917L ・ Φ / 100) ・ T + P∧0.5 * 0.024 * D∧2 ・ T)) / G Sa ・ G = S ・ GS ・ T ・ (0.001L + P∧0.5 * 0.024 * D∧2) -0.00917L ・ Φ / 100 ・ T + S1 ・ T ・ (0.001L + 0.00917L ・ Φ / 100 + P∧0.5 * 0.024 * D∧2) T = ((Sa -S) ・ G) / (-S ・ (0.001L + P∧0.5 * 0.024 * D∧2) -0.00917L ・ Φ / 100 + S1 ・ (0.001L + 0.00917L ・ Φ / 100 + P∧0.5 * 0.024 * D∧2))…
(6)

From the equation (6), to derive a formula for calculating the time required to increase from the lower limit electrical conductivity S2 to the upper limit electrical conductivity S3 when no blowing is performed, that is, to calculate the cooling water blow interval T1, the initial electrical conductivity S is calculated as S2 Then, the conductivity Sa of the cooling water after the fixed time may be set to S3. S → S2 = SS (1-α / 100) (7) Sa → S3 = SS (1 + α / 100) (8) Substituting equations (7) and (8) into equation (6), Since no blow is performed, the blow amount B
T1 = (SS ・ 2α / 100 ・ G) / (-SS (1-α / 100) * 0.001L-0.00917L ・
Φ / 100 + S1 (0.001L + 0.00917L · Φ / 100)) Similarly, from equation (6), the time required for the cooling water to fall from the upper limit conductivity S3 to the lower limit conductivity S2 when blowing, that is, cooling water In order to derive a calculation formula for calculating the blow time T2, the initial conductivity S may be set to S3, and the cooling water conductivity Sa after the fixed time may be set to S2. S → S3 = SS (1 + α / 100) (9) Sa → S2 = SS (1-α / 100) (10) Substituting equations (9) and (10) into equation (6), Β% as a correction coefficient A for error correction of an arithmetic expression, and γ% as a correction coefficient B for control correction for each device;
T2 =-(SS ・ 2α / 100 ・ G) / (-SS (1 + α / 100) * (0.001L + P∧0.5 *
0.024 * D∧2) -0.00917L ・ Φ / 100 + S1 (0.001L + 0.00917L ・ Φ /
100 + P∧0.5 * 0.024 * D∧2)) ・ (1-β / 100) ・ (1 + γ / 100) From the above formula, the cooling water blow interval T1 and cooling water blow time T2 can be obtained. it can.

Here, in the arithmetic expressions for obtaining the cooling water blow interval T1 and the cooling water blow time T2,
Input values required for calculating the blow interval and the blow time will be described. L: Cooling water circulation rate [m ³ / h] Normally, cooling water circulation rate uses machine management data. Φ: load condition [%] (cooling load in the present embodiment) As the cooling load, the average opening of the fuel control valve is used. When calculating the blow interval, the average value during the previous opening of the blow valve is used. When calculating the blow time, the average value during the previous closing of the blow valve is used. The initial value is 100%. G: Cooling water holding amount [m ³ ] Since the cooling water holding amount has little effect on control, the following value estimated from the machine management data is used. And 0.05 × (refrigerating capacity) m ^3. SS: Target circulating water conductivity [μS / cm] Input the target circulating water conductivity. Reference value is 500μ
S / cm. S1: Makeup water conductivity [μS / cm] Makeup water conductivity is input as data. Reference value is 200 μS / c
m. P: Cooling water inlet pressure [kg / cm ² ] The cooling water inlet pressure is entered as data. The standard value is 7.5kg /
and cm ^2. D: Cooling water blow orifice diameter [mm] Enter the orifice diameter as data. α: Fluctuation rate of cooling water conductivity [%] The fluctuation rate of cooling water conductivity is the following fixed value. The standard value is 5%
(However, it can be changed by terminal processing). β: Correction coefficient A [%] The correction coefficient A is the following fixed value in error correction of an arithmetic expression. The reference value is 10% (however, it can be changed by terminal processing). γ: correction coefficient B [%] As the correction coefficient B, a control correction value is input as data. Reference value is 0
% (Input values can be ±).

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail. In the absorption chiller / heater shown in FIGS. 1 and 2, the calculation formulas for obtaining the cooling water blow interval T1 and the cooling water blow time T2 are shown in Table 2 by using a calculation device incorporated in the operation control panel. When the cooling water blow interval and the cooling water blow time which are the reference are calculated under the conditions, the blow interval is 1.4 hours and the blow time is 2.3 hours. A simulation was performed in which the conductivity of the circulating cooling water (circulating water conductivity) at the start of the operation was varied while the blow interval and the blow time were fixed. The results are shown in FIGS.

[0020]

[Table 2]

The electric conductivity of the circulating water at the start of the operation was 200 μS / cm, 500 μS / cm and 1000 μS / cm, respectively.
As a result, the operation was continued at a blow interval of 1.4 hours and a blow time of 2.3 hours, and as a result, as shown in FIG. 4 and FIG. Are converged to the control range of the target conductivity (500 μS / cm), and it was found that all were controlled within the range of the target conductivity (500 μS / cm) after about 34 hours. Further, from the results of FIG. 4, even if the quality of the circulating cooling water entering the cooling water system at the start of operation fluctuates, the concentration multiple of the circulating cooling water with respect to the make-up water falls within a certain range over time. Turned out to be controlled. In the present embodiment, the concentration multiple converges to a control range of target conductivity / supplementation water conductivity = 500/200 = 2.5.

[0022]

As described above, the present invention has the following effects. (1) Calculate the theoretical blow interval (time when the blow solenoid valve is closed) and blow time (time when the blow solenoid valve is open) from the various data of the cooling water system and the operating conditions of the equipment, and circulate cooling. Since the blow of the cooling water is automatically controlled so that the water concentration multiple falls within a certain range, the blow control can be performed efficiently and with high accuracy without measuring the conductivity or the like using a sensor. (2) Since the blow method does not use a conductivity sensor or the like, maintenance of the sensor is unnecessary, and cost can be reduced. (3) Blow control with higher precision can be performed as compared with cooling water blow by a normal timer, so that unnecessary blow is not performed and the amount of makeup water used is reduced. Also,
While the blow solenoid valve is closed, the concentration multiple of the cooling water does not greatly increase and the water quality does not deteriorate. (4) The high-precision blow control effectively prevents the deterioration of the water quality of the circulating cooling water, so that dirt adheres to the heat transfer tubes and the like, and the performance of the absorption chiller / heater / absorption chiller decreases and the fuel consumption decreases. There is no risk of causing an increase. Of course, corrosion of the heat transfer tube and the like does not occur.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a cooling water automatic blowing device in an absorption chiller / heater / absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is an enlarged configuration diagram showing a cooling water blow pipe system of the automatic cooling water blow device according to the embodiment of the present invention.

FIG. 3 is a graph showing a change over time in circulating water conductivity when various cooling towers are used.

FIG. 4 is a graph showing the change over time of the concentration multiple of circulating water in an example of the present invention.

FIG. 5 is a graph showing a change over time in circulating water conductivity in an example of the present invention.

FIG. 6 is a schematic configuration diagram showing a cooling water automatic blowing device in a conventional absorption chiller / heater / absorption chiller.

FIG. 7 is an enlarged configuration diagram showing a cooling water blow piping system of a conventional cooling water automatic blowing device.

FIG. 8 is a systematic schematic configuration diagram showing an example of a conventional absorption chiller / heater.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Low temperature regenerator 12 Condenser 14 Absorber 16 Evaporator 18 High temperature regenerator 20 Low temperature heat exchanger 22 High temperature heat exchanger 24 Low temperature pump 26,28,32,36,38,40,46,48,5
0, 52, 58 Pipeline 30 Gas-liquid separator 34 High temperature pump 42 Combustion device 44 Heat recovery device 54, 60 Spray device 56 Refrigerant pump 62 Combustion chamber 64 Exhaust pipe 66 Cooling tower 68 Cooling water pump 70, 74 Cooling water pipe 72 Absorption chiller / heater 76 Blow pipe 78 Blow solenoid valve 80 Orifice 82 Ball tap 84 Supply water pipe 86 Control valve 88, 92 Joint 90 Sensor 91 Operation control panel (operation panel) 94 Manual valve 96 Drain valve 98 Inlet header 100 Arithmetic unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-138094 (JP, A) JP-A-4-139393 (JP, A) JP-A-64-243695 (JP, A) JP-A-5-239 332631 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 15/00 F25B 15/00 306 F28F 27/00 501

Claims (3)

(57) [Claims] 1. A method for preventing deterioration of water quality due to concentration of circulating cooling water by blowing the circulating cooling water when circulating the cooling water cooled by the cooling tower through an absorption chiller / heater / absorption chiller. The amount of cooling water circulated, the amount of cooling water retained in the cooling tower, the amount of water evaporated from the cooling tower, and the amount of water scattered from the cooling tower so that the concentration multiple of the circulating cooling water with respect to the makeup water to the cooling tower is within a certain range. Absorption cooling / cooling characterized by automatically calculating the cooling water blowing interval and blowing time from the water amount, cooling water blowing amount and load conditions of the absorption chiller / heater / absorption chiller, and automatically controlling the cooling water blowing. Automatic cooling water blow method for water machines and absorption refrigerators. 2. A method for preventing the deterioration of water quality due to the concentration of circulating cooling water by blowing the circulating cooling water when circulating the cooling water cooled in the cooling tower to the absorption chiller / heater / absorption chiller. The conductivity of make-up water to the cooling tower, the target conductivity of the circulating cooling water, the amount of cooling water circulated, the amount of cooling water held in the cooling tower,
Based on the amount of evaporating water from the cooling tower, the amount of water scattered from the cooling tower, the amount of cooling water blow, and the load conditions of the absorption chiller / heater / absorption refrigerator, the concentration multiple of the circulating cooling water with respect to the makeup water to the cooling tower is within a certain range. A method for automatically blowing cooling water in an absorption chiller / heater / absorption chiller, wherein the blowing of cooling water is automatically controlled by calculating such a blowing interval and a blowing time of cooling water. 3. A blow pipe having a blow solenoid valve is connected to a cooling water pipe for circulating the cooling water cooled by the cooling tower to the absorption chiller / heater / absorption refrigerator. This device prevents the deterioration of water quality due to the concentration of circulating cooling water by operating a part of the circulating cooling water. The conductivity of make-up water to the cooling tower and the target conductivity of circulating cooling water , Cooling water circulation amount, cooling water holding amount in cooling tower,
An operation control panel is used to calculate the cooling water blow interval and blow time from the amount of evaporating water from the cooling tower, the amount of water scattered from the cooling tower, the amount of cooling water blow, and the load conditions of the absorption chiller / heater / absorption refrigerator. The blow solenoid valve is automatically operated according to the blow interval and blow time determined by the arithmetic unit, so that the concentration multiple of the circulating cooling water with respect to the supply water to the cooling tower can be controlled within a certain range. To
An automatic cooling water blower for an absorption chiller / heater / absorption chiller, wherein the operation control panel is connected to a blow solenoid valve.