JPH11304398A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress increase of impurity concentration of cooling water in a cooling water regardless of the kind of water being used in an evaporation type cooling tower while suppressing water consumption. SOLUTION: A cooling tower 61 is provided with a cooling water tank 65 for storing cooling water. An earth electrode 76 and the electrodes of low and high level sensors 71, 72 for detecting inner water level and conductivity are arranged in the cooling water tank 65. When the water level in the tank 65 drops below a high level, conductivity of the cooling water is measured and if it is lower than a specified value, a water supply valve 60 is opened until the high level is reached to supplement cooling water. When the conductivity is higher than a specified value, the valve 60 is opened continuously for a specified time and water is supplied after the tank 65 is supplemented with cooling water. Consequently, excess cooling water is discharged from an overflow opening 66 and the cooling water is diluted. Blowdown is performed at a short interval when the water quality is low otherwise it is performed at a long interval.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner capable of cooling a room using a refrigeration cycle, and particularly to an absorption refrigeration cycle for removing heat of absorption and condensing vaporized refrigerant. The present invention relates to a technique for cooling cooling water.

[0002]

2. Description of the Related Art As a refrigerating cycle of an air conditioner, for example, an absorption type refrigerating cycle absorbs heat of absorption generated when a vaporized refrigerant is absorbed by an absorbent and absorbs the vaporized refrigerant by a condenser. Cooling water for cooling to liquefy and condense is used. This cooling water is cooled by a cooling tower installed outside the absorption refrigeration cycle and reused. That is, the cooling water flows through the cooling water circuit that is heated by the absorption refrigeration cycle and cooled by the cooling tower. As the cooling tower for cooling the cooling water, there is widely known an evaporating type in which the cooling water is brought into contact with the outside air to radiate heat, and at the same time, a part of the cooling water is evaporated to remove vaporization heat from the cooling water to cool the cooling water. Have been.

In the above-mentioned evaporative cooling tower, since the cooling water comes into contact with the outside air as described above, dust and soot contained in the outside air adhere to the cooling water, and the cooling water becomes dirty. On the other hand, in the evaporative cooling tower, a part of the cooling water evaporates and escapes into the outside air as described above. For this reason, simply replenishing the cooling water every time the cooling water evaporates and decreases does not involve the supply of mineral components (Mg, Ca, etc.) contained in the cooling water or the dust and soot mixed therein. The concentration of impurities in the cooling water inside gradually increases.

[0004] If the concentration of impurities in the cooling water is increased due to impurities such as dust and soot, an abnormal odor is generated from the cooling tower, or the impurities adhere to the flow path of the cooling water circuit, and the heat exchange efficiency in the absorber or the condenser is increased. And the cooling capacity may decrease. Therefore, in the case of cooling the cooling water using an evaporative cooling tower, the operation time is accumulated, and when the operation time exceeds a predetermined time, the drainage water provided at the lower part of the cooling water tank in which the cooling water is stored is provided. By opening the valve and draining part of the cooling water, and then closing the drain valve and refilling the cooling water tank with a new one, the blowdown was performed to prevent an increase in the concentration of impurities in the cooling water. .

[0005]

As described above, blowdown is performed to reduce the concentration of impurities in the cooling water in the cooling water tank. However, since the water used as cooling water is tap water from various places, differences in water quality between regions,
Or, despite the difference in the degree of dirt due to outside air,
Blowdown was performed under the same conditions (each time the accumulated operation time reaches a predetermined time).

As a result, conventionally, in the case of poor quality water containing a large amount of impurities, the time interval for performing blow-down is too long, and the concentration of impurities in the cooling water increases, resulting in the above-mentioned problem (bad odor). , The cooling capacity may be reduced). In the case of high quality water, the time interval for performing blowdown is too short. There is a problem of draining water wastefully.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an evaporative cooling system which is not affected by the type of water used in a cooling water circuit including a cooling tower and the outside air. It is an object of the present invention to suppress an increase in the concentration of impurities in cooling water cooled by a tower, to prevent excessive drainage of cooling water in a cooling water tank, and to reduce water consumption.

[0008]

The air conditioner of the present invention employs the following technical means to achieve the above object. [Means of claim 1] The air conditioner is an air conditioner having a refrigeration cycle, a) circulating cooling water for discharging heat in the refrigeration cycle, which is provided in a heat discharging means of the refrigeration cycle. A cooling water circuit provided in the cooling water circuit, and evaporating the cooling water so that the cooling water comes into contact with the outside air to radiate heat; and c) a cooling water tank provided in the cooling water circuit and storing the cooling water. D) conductivity detecting means for detecting the conductivity of the cooling water stored in the cooling water tank; e) drainage means for discharging the cooling water in the cooling water tank; and f) inside the cooling water tank. G) a cooling water supply means for supplying cooling water to the cooling water tank; and g) a drainage / water supply operation of the cooling water in the cooling water tank when the conductivity of the cooling water detected by the conductivity detection means becomes higher than a predetermined conductivity. To the drainage means and the water supply means Dilution control means for instructing to dilute the cooling water in the cooling water tank.

[0009] [Claim 2] In the air conditioner according to claim 1, the refrigeration cycle includes: h) heating means for heating the absorbing liquid; i) heating of the absorbing liquid by the heating means, A regenerator for partially vaporizing; j) a condenser for cooling and liquefying the vaporized refrigerant generated in the regenerator; k) an evaporator for evaporating the liquefied refrigerant liquefied in the condenser at a low pressure; A) an absorber for absorbing the vaporized refrigerant evaporated by the evaporator into an absorbent; and m) a solution pump for pumping the absorbent in the absorber to the regenerator. The water circuit removes heat of absorption in the absorber and circulates cooling water for cooling the vaporized refrigerant in the condenser.

[Claim 3] In the air conditioner according to claim 1 or 2, the water supply means includes: n) a water supply valve for opening and closing a water supply passage, and the cooling water tank comprises: o) a predetermined water level. An overflow port for discharging the above cooling water is provided, and the dilution control unit opens the water supply valve when the conductivity of the cooling water detected by the conductivity detection unit becomes higher than a predetermined conductivity. Water is supplied into the cooling water tank, and a predetermined amount of cooling water is discharged from the overflow port of the cooling water tank by continuously supplying water even after the water level in the cooling water tank exceeds the overflow port. Features.

According to a fourth aspect of the present invention, in the air conditioner according to the first, second or third aspect, the electric conductivity detecting means also serves as an electrode of a water level sensor for detecting a water level in the cooling water tank. An air conditioner characterized by:

[0012]

[Operation and effect of the invention] [Operation and effect of claim 1] By the operation of the refrigeration cycle, heat in the refrigeration cycle is discharged from the exhaust heat means to the cooling water circuit. In the cooling water circuit, the temperature of the cooling water rises when the heat of the exhaust heat means is received. The cooling water evaporates in the cooling tower and self-cools, and its temperature decreases. Here, impurities such as mineral components in the cooling water are concentrated by evaporation, and the concentration of the cooling water gradually increases.

In the cooling water tank for storing the cooling water in the cooling water circuit, the electric conductivity (for example, current value) is detected by the electric conductivity detecting means, and when the detected electric conductivity becomes higher than a predetermined electric conductivity, the inside of the cooling water is reduced. , The dilution control means instructs the drainage means and the water supply means to perform a drainage operation and a water supply operation. The cooling water in the cooling water tank is discharged according to a drain instruction of the dilution control unit, and the cooling water is supplied into the tank according to the water supply instruction. Therefore, the cooling water having the higher impurity concentration in the cooling water tank is diluted.

The way of dilution of the cooling water in the cooling water tank is as follows:
A drain valve is provided at the bottom of the cooling water tank, and the drain valve is opened and drained, followed by supplying water, or a cooling water tank is provided with an overflow port,
There is a blowdown method in which water is supplied into a cooling water tank to lower the concentration of impurities, and a part of the cooling water having a higher impurity concentration is discharged by continuously supplying water even after overflowing.

As described above, in the first aspect, the cooling water in the cooling water tank is not diluted while the concentration of impurities is low,
It is diluted only when the concentration of impurities becomes high. Therefore,
In areas where high-quality water is used or when the outside air is not contaminated, excessive discharge water supply operation is not performed,
No water is wasted. Conversely, in areas where the water content is poor and the outside air is contaminated with a large amount of impurities, the cooling water in the cooling water tank is immediately diluted when the concentration of the impurities in the cooling water increases, and The cooling water having a high concentration does not circulate in the cooling water circuit. Therefore, it is unlikely that the cooling ability is reduced due to generation of an unusual odor or adhesion of impurities in the cooling water circuit.

As a result, regardless of the type of water used as the cooling water or the degree of contamination of the outside air, drainage and water supply are not performed until the time when the cooling water in the cooling water tank needs to be diluted. When the concentration becomes high and dilution becomes necessary, drainage and water supply is performed immediately, eliminating waste of water and always diluting before it becomes a state that affects equipment. .

[Action and Effect of Claim 2] In claim 2, an absorption refrigeration cycle is used as a refrigeration cycle. When the absorption liquid is heated by a regenerator by a heating means, a part of the absorption liquid is vaporized. The vaporized refrigerant is cooled by the cooling water circulating in the cooling water circuit in the condenser and liquefied. The liquefied refrigerant liquefied in the condenser evaporates at a low pressure in the evaporator. Absorbent liquid, which is concentrated by vaporizing the refrigerant in the regenerator,
The vaporized refrigerant supplied to the absorber and evaporated by the evaporator is absorbed. The heat generated during the absorption of the refrigerant is absorbed by the cooling water circulating in the cooling water circuit, circulates in the cooling water circuit together with the cooling water absorbed by the condenser, is radiated by the outside air in the cooling tower, and is cooled. .

Also in this absorption refrigeration cycle, the dilution of the cooling water in the cooling water tank is performed based on the conductivity of the cooling water, just as in the case of the first aspect. Regardless of the type of air or the degree of contamination of the outside air, when the cooling water in the cooling water tank needs to be diluted, the drainage and water supply are not performed, and the concentration of impurities becomes high and dilution is required. Since the drainage and water supply is performed immediately, the wastewater can be eliminated, and the dilution can always be performed before the condition affecting the equipment is reached.

When the electric conductivity of the cooling water in the cooling water tank exceeds a predetermined electric conductivity and blowdown is required, the water supply valve is opened to open the cooling water tank. When water is supplied to the cooling water tank, the concentration of impurities in the cooling water in the cooling water tank decreases. If the water supply continues even after the overflow of the cooling water tank, the concentration of the impurities in the cooling water in the cooling water tank will be further reduced, and the cooling water with the reduced impurity concentration will overflow into the cooling water tank. The amount of water supplied after passing the mouth,
The longer the time that the water is discharged from the overflow port and the water supply is continued, the concentration of the impurities in the cooling water tank decreases, and the water is gradually replaced with the water to be supplied. Therefore, since blowdown is performed only when necessary, the amount of water to be supplied can be suppressed, and significant water saving can be achieved.

[Operation and Effect of Claim 4] The amount of cooling water in the cooling water tank can be ascertained by detecting the water level in the cooling water tank. Further, for example, in the case of performing blowdown by supplying water beyond the overflow port as in claim 3, the relationship between the time during which water supply is continued and the change in water level causes It is possible to grasp how much the cooling water has been replaced. As described above, as a water level sensor for detecting the water level in the cooling water tank, there is an electrode type water level sensor for checking whether or not the cooling water is conductive. When such an electrode type water level sensor is used, the conductivity can be simultaneously detected when checking the conduction in the cooling water. As described in claim 4, by using the electrode for detecting the water level as the electric conductivity detecting means for detecting the electric conductivity in the cooling water tank, the water level and the electric conductivity can be detected by the same electrode. Therefore, the structure inside the cooling water tank is simplified.

[0021]

Next, an air conditioner according to the present invention will be described with reference to an embodiment shown in the drawings. FIGS. 1 to 4 show a first embodiment. FIG. 1 is a schematic configuration diagram of an absorption type air conditioner using a double effect absorption type refrigeration cycle for performing indoor air conditioning.

[Schematic Description of Absorption Air Conditioner 1] The absorption liquid air conditioner 1 to which the present embodiment is applied is a relatively small one used for home use and the like. In this example, a heating means 2 for heating lithium bromide aqueous solution, a double effect absorption refrigeration cycle 3, and cold / hot water cooled or heated by the absorption refrigeration cycle 3 (a heat medium for cooling / heating the room; Indoor air-conditioning means 4 for air-conditioning the room with water in the embodiment, and cooling water cooling means 5 for cooling the cooling water mainly used for cooling the vaporized refrigerant (steam in this embodiment) in the absorption refrigeration cycle 3. And a control device 6 for controlling each mounted electric machine functional component.

[Explanation of Heating Means 2] The heating means 2 of the present embodiment is a gas combustion device which burns a gas as a fuel to generate heat and heats the absorbing liquid by the generated heat. The gas burner 11 includes a gas supply unit 12 that supplies gas to the gas burner 11, a combustion fan 13 that supplies air for combustion to the gas burner 11, and the like. Then, the heat obtained by the gas combustion of the gas burner 11 heats the boiler 14 of the absorption refrigeration cycle 3 to heat the low-concentration absorption liquid (hereinafter, low liquid) supplied into the boiler 14. Is provided.

[Description of Absorption Refrigeration Cycle 3] The absorption refrigeration cycle 3 is provided with a boiler 14 heated by the heating means 2, and the low liquid supplied into the boiler 14 is heated to A high-temperature regenerator 15 that evaporates (evaporates) the refrigerant (water) contained in the low liquid into a medium-concentration absorbing liquid (hereinafter, medium liquid), and utilizes heat of condensation of the vaporized refrigerant in the high-temperature regenerator 15. A low-temperature regenerator that heats an intermediate liquid supplied from the high-temperature regenerator 15 using a pressure difference, vaporizes a refrigerant contained in the intermediate liquid, and turns the intermediate liquid into a high-concentration absorbing liquid (hereinafter, high liquid). A condenser 17 for cooling and liquefying the vaporized refrigerant (steam) from the high-temperature regenerator 15 and the low-temperature regenerator 16;
An evaporator 18 for evaporating the liquefied refrigerant (water) liquefied by the condenser 17 under a pressure close to vacuum, and an absorption for absorbing the vaporized refrigerant evaporated by the evaporator 18 to the high liquid obtained by the low-temperature regenerator 16. And a vessel 19.

[Explanation of the high temperature regenerator 15]
Is a boiler 1 for heating the low liquid by the heating means 2.
4, and a boiling cylinder 21 extending upward from the boiler 14
Is provided. The vaporized refrigerant that has been boiled in the boiler 14 and the boiling cylinder 21 and vaporized from the low liquid is blown out from the boiling cylinder 21 into the cylindrical high-temperature regeneration container 22. The high-temperature vaporized refrigerant blown into the high-temperature regeneration container 22 is
The second wall removes heat as heat of vaporization when the middle liquid in the low-temperature regenerator 16 evaporates and is cooled to become a liquefied refrigerant (water).

In the high-temperature regenerating vessel 22, the medium liquid in the boiling cylinder 21 after the refrigerant in the low liquid is vaporized by being heated by the boiler 14 and the liquefied refrigerant (water) stored in the surroundings are insulated. For this purpose, a heat insulating partition tube 24 is provided around the boiling tube 21. The heat insulating partition tube 24 has an upper end joined to the upper end of the boiling tube 21, a lower end provided with a gap from the boiling tube 21, and provided so that air enters between the boiling tube 21 and the heat insulating partition tube 24. Have been. The liquefied refrigerant (water) liquefied in the high-temperature regeneration container 22 and separated outside the heat insulating partition tube 24 is guided to the condenser 17 through a liquid refrigerant pipe 25 connected to a lower portion.

[Explanation of the low-temperature regenerator 16]
Includes a cylindrical low-temperature regeneration container 31 covering the high-temperature regeneration container 22. On the other hand, the middle liquid in the boiling cylinder 21 is supplied to the low-temperature regenerator 16 through a middle liquid pipe 26 connected to a lower part of the boiling cylinder 21. The middle liquid pipe 26 is provided with a throttle means 27 such as an orifice. This aperture means 27
When the cooling / heating switching valve 53 described later is closed, the medium flows while maintaining the pressure difference between the high-temperature regenerator 15 and the low-temperature regenerator 16. Do not shed.

The low temperature regenerator 16 injects the middle liquid supplied through the middle liquid pipe 26 toward the ceiling of the high temperature regeneration container 22. The temperature in the low temperature regeneration vessel 31 is
2, the pressure in the low temperature regeneration container 31 is lower than the pressure in the high temperature regeneration container 22. Therefore, the middle liquid supplied from the middle liquid pipe 26 into the low-temperature regeneration container 31 is easily evaporated. Then, when the middle liquid is injected into the ceiling of the high temperature regeneration container 22, the middle liquid is heated by the wall of the high temperature regeneration container 22, and a part of the refrigerant contained in the middle liquid evaporates to become a vaporized refrigerant, Becomes high liquid.

Here, the upper part of the low-temperature regeneration container 31 communicates with the upper side of the condensing container 32 in the shape of an annular container through a communication part 33. Therefore, the vaporized refrigerant evaporated in the low-temperature regeneration container 31 is supplied into the condensation container 32 through the communication portion 33. On the other hand, the high liquid falls to the lower part of the low temperature regeneration container 31 and is supplied to the absorber 19 through the high liquid pipe 34 connected to the lower part of the low temperature regeneration container 31. In addition, the low temperature regeneration container 3
1, a ceiling plate 35 is provided.
A gap 36 through which the vaporized refrigerant passes is provided between the outer peripheral end of 5 and the low temperature regeneration container 31.

[Explanation of the Condenser 17] The condenser 17 is covered by an annular container-shaped condensing container 32. Inside the condensing container 32, a condensing heat exchanger 37 for cooling and liquefying the vaporized refrigerant in the condensing container 32 is arranged. The condensing heat exchanger 37 is an annular coil through which cooling water flows. The liquefied refrigerant supplied from the low-temperature regenerator 16 into the condensing container 32 is supplied to the condensing heat exchanger 3.
The mixture is cooled and liquefied by 7 and dropped below the condensing heat exchanger 37.

On the other hand, a refrigerant is supplied to the lower side of the condensing container 32 from the high-temperature regenerator 15 through the liquid refrigerant pipe 25. When the supplied refrigerant is supplied into the condensing container 32, the pressure difference (the pressure inside the condensing container 32 is about 70 mmHg).
From low pressure), the mixture is reboiled, and supplied in a state where the vaporized refrigerant and the liquefied refrigerant are mixed. Further, a liquid refrigerant supply pipe 38 for guiding the liquefied refrigerant to the evaporator 18 is connected to the condensation container 32. The liquid refrigerant supply pipe 38 is provided with a refrigerant valve 39 for adjusting the supply amount of the liquefied refrigerant supplied from the condensation container 32 to the evaporator 18.

[Explanation of the Evaporator 18] The evaporator 18 is provided together with the absorber 19 at the lower part of the condensing container 32. The evaporator 18 is formed by an evaporation container 41 in the shape of an annular container provided around the low temperature regeneration container 31. Covered. An evaporation heat exchanger 42 for evaporating the liquefied refrigerant supplied from the condenser 17 is disposed outside the inside of the evaporation absorption container 41. This evaporating heat exchanger 42 is an annular coil,
Cold and hot water (heat medium) supplied to the indoor air-conditioning means 4 inside
Flows. The liquefied refrigerant supplied from the condenser 17 via the liquid refrigerant supply pipe 38 is sprayed onto the evaporating heat exchanger 42 from an annular refrigerant spraying tool 43 disposed above the evaporating heat exchanger 42. Is done.

Since the inside of the evaporative absorption container 41 is kept substantially at a vacuum (for example, 6.5 mmHg), it has a low boiling point, and the liquefied refrigerant sprayed to the evaporating heat exchanger 42 is very easy to evaporate. The liquefied refrigerant sprayed to the evaporating heat exchanger 42 evaporates by taking vaporization heat from the cold and hot water flowing in the evaporating heat exchanger 42. As a result, the cold / hot water flowing in the evaporating heat exchanger 42 is cooled. Then, the cooled cold / hot water is guided to the indoor air-conditioning means 4 to cool the room.

[Description of Absorber 19] The absorber 19 is covered with the evaporation absorption container 41 as described above. The absorber 19 is provided inside the evaporative absorption container 41 with the high liquid pipe 3.
An absorption heat exchanger 44 for cooling the high liquid supplied from 4 is arranged. The heat exchanger 44 for absorption is an annular coil, and the inside thereof is supplied with cooling water for cooling the high liquid sprayed on the coil. After passing through the heat exchanger 44 for absorption, the cooling water passes through the heat exchanger 37 for condensation of the condenser 17 and is guided to the cooling water cooling means 5 to be cooled. Then, the cooling water cooled by the cooling water cooling means 5 is guided again to the absorption heat exchanger 44.

On the other hand, on the upper part of the absorption heat exchanger 44, there is arranged an annular absorbent dispersion device 45 for dispersing the high liquid supplied from the high liquid pipe 34 to the absorption heat exchanger 44. The high liquid sprayed on the absorption heat exchanger 44 is generated by evaporation of the liquefied refrigerant in the evaporation heat exchanger 42 while falling from above to below along the coil surface of the absorption heat exchanger 44. Absorbs vaporized refrigerant. As a result, the evaporation absorption container 41
The absorption liquid that has fallen to the bottom becomes a low liquid with a low concentration.

Inside the evaporation absorption container 41, a cylindrical partition wall 4 is provided between the evaporation heat exchanger 42 and the absorption heat exchanger 44.
6 are arranged. The cylindrical partition wall 46 communicates with the inside of the evaporation absorption container 41 only at the upper side, and the vaporized refrigerant generated by the evaporator 18 is guided into the absorber 19 through the upper part of the cylindrical partition wall 46. .

A low liquid pipe 47 for supplying the low liquid at the bottom of the evaporative absorption container 41 to the boiler 14 is connected to the bottom of the evaporative absorption container 41. The low liquid pipe 47 is provided with a solution pump 48 for flowing the low liquid from the inside of the evaporation absorption container 41 in a substantially vacuum state toward the boiler 14.

[Description of Components Other than Above in Absorption Refrigeration Cycle 3] Reference numeral 51 shown in FIG.
A high-temperature heat exchanger 51 for exchanging heat between the medium liquid flowing from the inside to the low-temperature regenerator 16 and the low liquid flowing from the absorber 19 to the boiler 14.
a, and a low-temperature heat exchanger 51b for exchanging heat between the high liquid flowing from the low-temperature regenerator 16 to the absorber 19 and the low liquid flowing from the absorber 19 to the boiler 14. The high-temperature heat exchanger 51a cools the middle liquid flowing from the boiling cylinder 21 to the low-temperature regenerator 16 and heats the low liquid flowing from the absorber 19 to the boiler 14. The low-temperature heat exchanger 51b cools the high liquid flowing from the low-temperature regenerator 16 to the absorber 19 and heats the low liquid flowing from the absorber 19 to the boiler 14.

The absorption refrigeration cycle 3 of this embodiment is provided with heating operation means for performing a heating operation in addition to the cooling operation by the above-described operation. The heating operation means includes a heating pipe 52 for guiding the high-temperature absorbing liquid from the lower part of the boiling cylinder 21 to a lower part of the evaporator 18, and a cooling / heating switching valve 53 for opening and closing the heating pipe 52. The cooling / heating switching valve 53 opens during the heating operation to guide the high-temperature absorbing liquid into the evaporating / absorbing container 41 and heat the cold / hot water flowing in the evaporating heat exchanger 42 of the evaporator 18.

[Description of Indoor Air Conditioning Means 4]
Is forcibly exchanging heat between the cold and hot water passing through the indoor heat exchanger 54 installed in the room and the evaporator 18 flowing through the indoor heat exchanger 54 and the room air, and blowing the air after the heat exchange into the room. And an indoor fan 55 for causing the indoor fan 55 to operate.

A cold / hot water circuit 56 for circulating cold / hot water is connected to the indoor heat exchanger 54, and the cold / hot water circuit 56 is provided with a cold / hot water pump 57 for circulating cold / hot water. The cold / hot water pump 57 is driven by a motor that also drives the solution pump 48.

The cold / hot water circuit 56 is a water pipe that guides the cold / hot water that has passed through the evaporator 18 to the indoor heat exchanger 54 and guides the cold / hot water that has exchanged heat with the room air to the evaporator 18 again. Inside, the indoor heat exchanger 54 and the cold / hot water pump 57
In addition, a cistern 58 for storing cold / hot water and replenishing cold / hot water in the cold / hot water circuit 56 is provided while functioning as an expansion tank for heating.

A water supply pipe 59 for supplying cold / hot water (tap water) to the inside is connected to the cistern 58. In this water supply pipe 59, supply of cold and hot water into the cistern 58,
A water supply valve 60 for stopping is provided. The cistern 58 includes a water level sensor (not shown).
To open and refill the cistern 58 with cold and hot water. The cistern 58 is provided with overflow water supply means 59a for guiding the overflowed cold / hot water as cooling water into a cooling water tank 65 described later. That is, the water supply pipe 59 and the overflow water supply means 59a constitute a water supply means for supplying the cooling water into the cooling water tank 65.

[Description of Cooling Water Cooling Means 5] The cooling water cooling means 5 includes an evaporative cooling tower 61, a cooling water circuit 62 for circulating cooling water, and a cooling water pump for circulating cooling water in the cooling water circuit 62. 63 is provided. The cooling tower 61 includes the absorber 1
The cooling water that has passed through the condenser 9 and the condenser 17 flows downward from above, exchanges heat with the outside air while flowing to radiate heat, and partially evaporates during the flow, thereby cooling during the evaporation. A spraying unit 61 for removing vaporization heat from water and cooling the flowing cooling water, and spraying the cooling water upward.
a, an evaporator 61b having a large surface area through which the cooling water flows, and a collector 61c for collecting the cooling water passing through the evaporator 61b
It is composed of In addition, the cooling tower 61 includes an evaporator 6
1b is provided with a cooling water fan 64 for generating an air flow and promoting the evaporation and cooling of the cooling water in the evaporating section 61b.

The cooling water circuit 62 passes the cooling water, which has passed through the absorber 19 and the condenser 17 and has increased in temperature, to the cooling tower 6.
1 and sends the cooling water cooled by the cooling tower 61 to the absorber 19 and the condenser 17 again. In the cooling water circuit 62, in addition to the cooling tower 61 and the cooling water pump 63,
A cooling water tank 65 for storing cooling water is provided. The cooling water tank 65 is provided below the cooling tower 61 and at the cistern 5.
8, the cooling water passing through the cooling tower 61 is supplied, and the water overflowing in the cistern 58 is supplied through the evaporating section 61b.

As shown in FIG. 2, the cooling water tank 65 is provided with an overflow port 66 for storing a predetermined amount (for example, 14 liters) inside and for overflowing and draining the cooling water of a higher level to the outside. The cooling water supplied to the cooling water tank 65 is directly surrounded by the overflow port 66 without being used for dilution.
A guide container 67 is provided to prevent the liquid from being discharged from the container. The inside of the cooling water tank 65 is divided into two by the guide container 67, and water is supplied to the side where the overflow port 66 does not exist, and the cooling water with a high concentration is discharged from the overflow port 66 due to dust and soot mixed therein. It will be easier. The cooling water discharged from the overflow port 66 is discharged downward through a drain pipe 68 connected to the overflow port 66.

In the cooling water tank 65, a low level water level set lower than the overflow port 66 (for example, a water level of 12 liters which is 2 liters smaller than the water level defined by the overflow port 66) is detected. A low-level sensor 71 is provided, and a high-level water level set lower than the overflow port 66 and higher than the low-level water level (for example, a 13-liter water level one liter greater than the low-level water level) Is provided with a high level sensor 72 which is an electrode for detecting the Further, a ground electrode 76 for detecting the water level between each of the level sensors 71 and 72 is provided below the low level sensor 71 inside the cooling water tank 65.

The cooling water in the cooling water circuit 62 is supplied to the cooling tower 61.
As a result, the concentration of mineral components such as Ca and Mg in the cooling water and the concentration of impurities such as dust and soot mixed during self-cooling in the air gradually increase. When the concentration of the impurities in the cooling water increases, impurities such as mineral components adhere to the pipeline in the cooling water circuit 62, and the heat transfer efficiency (heat exchange efficiency) in the absorber 19 and the condenser 17 deteriorates, and the cooling operation is performed. There is a risk of reduced ability. For this reason, in the present embodiment, whether or not the concentration of impurities in the cooling water tank 65 has progressed is determined based on the conductivity of the cooling water in the cooling water tank 65, and the conductivity increases and the concentration proceeds. If it is determined that this is the case, the blowdown described later is performed to dilute and replace the cooling water in the cooling water tank 65.

For this purpose, in this embodiment, among the above-mentioned electrodes, the low-level sensor 71 and the ground electrode 76 are also used as detecting electrodes of the conductivity detecting means for detecting the conductivity of the cooling water.

When the controller 6 determines that blowdown is necessary based on the detected electric conductivity and issues a blowdown instruction signal, the blowdown operation means of the controller 6 operates. The blowdown operation means (details will be described later) receives the blowdown instruction signal and
Open 0. The water supply valve 60 is opened, and the water overflowing from the cistern 58 is guided into the cooling water tank 65 via the overflow water supply means 59a and the evaporating section 61b, and supplies the cooling water into the cooling water tank 65. After the replenishment to the predetermined water level (14 liter water level), which is the height of the overflow port 66, is completed, a predetermined amount (for example, 2 liters) is maintained.
An excessive amount of cooling water is supplied into the cooling water tank 65 and overflowed from the overflow port 66 to drain.
The water supply valve 60 is closed by the blowdown operation means. In other words, even after the replenishment of the cooling water into the cooling water tank 65 is completed, a predetermined amount of the cooling water is excessively supplied to the cooling water tank 6.
5, the cooling water is diluted, and an excess amount of water is discharged from the overflow port 66 to the outside.

[Explanation of the control device 6] The control device 6 includes the above-described refrigerant valve 39, solution pump 48 (cold / hot water pump 57),
Electrical functional components such as the indoor fan 55, the cooling / heating switching valve 53, the water supply valve 60, the cooling water pump 63, the cooling water fan 64, and the electrical functional components of the heating means 2 (combustion fan 1
3. Gas control valve 73, gas on-off valve 74, ignition device 75
) Is controlled in accordance with an operation signal of a controller (not shown) manually set by a user or an input signal of a plurality of sensors provided. Hereinafter, only control related to blowdown for preventing the concentration of the cooling water in the cooling water tank 65 will be described.

[Explanation of Conductivity Detecting Means] In order to determine whether or not to blow down the cooling water in the cooling water tank 65, the control device 6 controls the conductivity of the cooling water in the cooling water tank 65. Is provided as a functional configuration. In this embodiment, the electric conductivity is detected by the electric conductivity detecting means when the amount of the cooling water in the cooling water tank 65 becomes lower than the high level water level, and blowdown is performed based on the result.

Hereinafter, the control of the electric conductivity detecting means will be briefly described with reference to FIG. The control device 6 detects the outputs of the high-level sensor 72 and the low-level sensor 71 in the cooling water tank 65 constantly or at predetermined intervals (for example, every 30 seconds) (step S11).
2 is turned off (OFF) and the water level of the cooling water in the cooling water tank 65 falls below the high level water level (YE
S), the electric conductivity of the cooling water in the cooling water tank 65 is measured by the current value between the ground electrode 76 and the low level sensor 71 (step S12).

If the measured conductivity of the cooling water in the cooling water tank 65 is lower than the predetermined conductivity (step S13).
At NO), the low level sensor 71 is non-conductive (OF
F), it is detected whether or not the water level has dropped below the low level water level (step S14). If the water level is lower than the low level water level (YES), a fixed amount of water is replenished (step S15). Specifically, the water supply valve 60 is opened and refilled until the water level in the cooling water tank 65 exceeds the high level water level (until the high level sensor 72 is turned on).

In step S13, if the detected conductivity (current value) of the cooling water is higher than the predetermined conductivity (predetermined current value) (YES), it is determined that blowdown operation is necessary, and A blowdown operation signal is issued to perform a blowdown operation (step S20) described later.

[Explanation of Blowdown Operation Means] As described above, the control device 6 controls the cooling water when the high level sensor 72 provided in the cooling water tank 65 is turned off to detect a level below the high level water level. When the electric conductivity of the cooling water is higher than the predetermined electric conductivity, the water supply valve 60 is opened to supply the cooling water into the cooling water tank 65, and the predetermined amount of the cooling water is excessively supplied into the cooling water tank 65. Blow-down operation means for diluting the cooling water by means of cooling air.

An example of control of the water supply valve 60 by the blowdown operation means will be described with reference to the flowchart of FIG. As a result of the measurement by the conductivity detecting means in the control device 6, it is determined that the blowdown operation is necessary, and a blowdown operation signal is output (YE in step S21).
S), the water supply valve 60 is opened to start supplying the cooling water to the cooling water tank 65 (step S22).

Next, it is determined whether or not the amount of cooling water in the cooling water tank 65 has increased and the high level sensor 72 has detected (ON) the high level water level (step S23). If the determination result is YES, the water supply valve 60 is opened until a predetermined time (for example, 30 seconds) necessary for sufficiently cooling the cooling water in the cooling water tank 65 with the supplied water has elapsed. When a predetermined time has elapsed (YES in step S24), the water supply valve 60 is closed (step S25), and the blowdown operation ends.

[Operation of Embodiment] Next, the absorption air conditioner 1
The operation of the cooling operation and the operation of the blow-down operation at the time of performing the cooling operation will be described. When the absorption type air conditioner 1 is started, the heating means 2 is activated by the operation of each electric function part.
And the absorption refrigeration cycle 3 operates. In the absorption refrigeration cycle 3, when the heating means 2 heats the boiler 14, the high-temperature regenerator 15 takes out the vaporized refrigerant from the low liquid and the low-temperature regenerator 16 takes out the high liquid from the middle liquid. .

The vaporized refrigerant taken out by the high-temperature regenerator 15 and the low-temperature regenerator 16 is condensed and liquefied by the condenser 17 and is then dispersed to the evaporator heat exchanger 42 of the evaporator 18 to be evaporated. The heat of vaporization is taken from the cold and hot water in 42 to evaporate. Therefore, the cooled hot and cold water that has passed through the evaporating heat exchanger 42 and is cooled is supplied to the indoor heat exchanger 54 of the indoor air conditioner 4 to cool the room.

The vaporized refrigerant evaporated in the evaporator 18 passes above the cylindrical partition wall 46 and flows into the absorber 19.
On the other hand, in the absorber 19, the high liquid taken out by the low-temperature regenerator 16 is dispersed to the absorption heat exchanger 44, and the high liquid absorbs the vaporized refrigerant flowing from the evaporator 18. Note that the absorption heat generated when the vaporized refrigerant is absorbed by the high liquid is absorbed by the absorption heat exchanger 44, thereby preventing the absorption capacity from lowering. Note that the high liquid that has absorbed the vaporized refrigerant in the absorber 19 becomes a low liquid and is sucked by the solution pump 48,
It is returned into the boiler 14 again, and the above cycle is repeated.

[Explanation of Operation of Blowdown Operating Means] During the above cooling operation by the absorption refrigeration cycle 3, the condenser 17
The cooling water heated by the absorber 19 is blown by the cooling water fan 64 in the evaporating section 61b of the cooling tower 61, so that heat is forcibly released by the outside air and a part of the cooling water evaporates. For this reason, the cooling water having the predetermined water level (the water level reaching the overflow port 66) is gradually reduced by the previous blow-down operation of the cooling water.

When the cooling water evaporates and the water level in the cooling water tank 65 becomes lower than the high level water level, the conductivity of the cooling water in the cooling water tank 65 is measured. When the electric conductivity is lower than the predetermined electric conductivity, the control device 6 sets the water supply valve 60 when the water level in the cooling water tank 65 becomes lower than the low level water level.
, And about 2 liters of cooling water until the high level sensor 72 is turned on to reach the high level water level is supplied to the cooling water tank 65 to replenish the cooling water.

When the electric conductivity is higher than the predetermined electric conductivity, the control device 6 opens the water supply valve 60 to supply the cooling water to the cooling water tank for a predetermined time (30 seconds) after reaching the high level water level. 65. At this time, of the supplied cooling water, it reaches the overflow port 66 (about 10
Second) is used for refilling the cooling water tank 65, and the next 20 seconds (about 3 liters) are used for dilution of the cooling water. That is, by supplying an excess of 3 liters of cooling water to the cooling water tank 65, the cooling water is diluted, and the excessively supplied 3 liters of cooling water is drained from the overflow port 66 to the outside. .

[Effects of the Embodiment] The absorption type air conditioner 1 uses the overflow port 66 for overflowing and discharging the cooling water having a predetermined water level or higher. By supplying the cooling water to the tank 65, blowdown is performed, and an increase in the concentration of impurities in the cooling water by the cooling water cooling means 5 can be prevented. As described above, since the blowdown operation is controlled based on the electric conductivity of the cooling water in the cooling water tank 65, no useless blowdown operation is performed and no water is wasted. Further, in areas where the quality of water is low, the blowdown can be reliably performed when the conductivity increases, so that the concentration of the cooling water in the cooling water tank 65 proceeds, and Impurities are not attached to the pipeline and cause troubles such as a decrease in cooling capacity.

[Second Embodiment] FIG. 5 shows a second embodiment and is a schematic view of a cooling tower. [Configuration of Second Embodiment] In this embodiment, a drain port 65a and a drain valve 69 are provided at the bottom of a cooling water tank 65 as another example of the drain means. In this embodiment, the cooling water tank 6
5 to a cooling water pump 63 connected to a cooling water circuit 62
Is provided with a drain valve 69 for discharging the cooling water in the cooling water tank 65. In the blowdown operation, the drain valve 69 is opened to discharge the concentrated cooling water in the cooling water tank 65. After the water is discharged to the low level, the water supply valve 60 is opened again to supply water to the high level.

In this embodiment, the drain valve 69 is opened only when necessary based on the electric conductivity of the cooling water in the cooling water tank 65 to perform blowdown by using the drain valve 69. There is an effect similar to that of the first embodiment. In addition, since the concentrated cooling water is once discharged, waste of the cooling water in blowdown can be eliminated, and the dilution effect is large. In addition, the first embodiment and the second embodiment are combined. For example, after the blowdown due to overflow is repeated five times, or when the cycle of blowdown due to overflow becomes shorter than a predetermined interval and becomes shorter, the drain valve 69 is used. The blowdown may be performed once. Thus, a large dilution effect can be obtained without increasing the opening and closing frequency of the drain valve 69.

In the above embodiment, the double effect absorption refrigeration cycle 3 has been described as an example of the absorption refrigeration cycle. However, a single effect absorption refrigeration cycle may be used.
It may be an absorption cycle of a multiple effect type having a heavy load or more. Also,
When the medium solution is injected into the low-temperature regenerator, an example has been described in which the medium is injected from above the low-temperature regenerator 16, but it may be injected from below.
In the first and second embodiments, the cooling water (tap water) overflowing with the cistern 58 is supplied to the cooling water tank 65, but the cooling water is supplied directly from the water supply pipe 59 to the cooling water tank 65. Is also good.

As a heating source of the heating means 2, a gas burner 11
However, an oil burner or an electric heater may be used, or exhaust heat of another device (for example, an internal combustion engine) may be used. Although the example in which the heat exchanger for condensation 37, the heat exchanger for evaporation 42, and the heat exchanger for absorption 44 are provided in a coil shape has been described, other types of heat exchangers such as a tube and fin or a stacked heat exchanger are used. May be used.

Although an aqueous solution of lithium bromide has been taken as an example of the absorbing solution, other absorbing solutions such as an aqueous ammonia solution using ammonia as a refrigerant and water as an absorbent may be used. As an example of cold / hot water (heat medium), tap water was used and shared with the cooling water in the cooling water circuit. However, other heat medium such as antifreeze or oil different from the cooling water in the cooling water circuit was used. Is also good.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an absorption type air conditioner (first embodiment).

FIG. 2 is a schematic configuration diagram of a cooling water tank (first embodiment).

FIG. 3 is a flowchart showing an operation of conductivity measurement by the control device.

FIG. 4 is a flowchart illustrating an operation of a blow-down operation performed by a control device.

FIG. 5 is a schematic view of a cooling tower including a water supply tank (second embodiment).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Absorption air conditioner 2 Heating means 3 Absorption refrigeration cycle 5 Cooling water cooling means 6 Control device (conductivity detection means, drainage control means) 15 High temperature regenerator 16 Low temperature regenerator 17 Condenser 18 Evaporator 19 Absorber 48 Solution Pump 59 Water supply pipe (water supply means, drainage means) 59a Overflow water supply means (water supply means) 60 Water supply valve (drainage means) 61 Cooling tower 62 Cooling water circuit 65 Cooling water tank 66 Overflow port 71 Low level sensor (conductivity detecting means) , Water level sensor) 76 Earth electrode (conductivity detecting means, water level sensor)

Claims (4)

[Claims] 1. An air conditioner having a refrigeration cycle, comprising: a) a cooling water circuit provided in a heat discharging means of the refrigeration cycle and circulating cooling water for discharging heat in the refrigeration cycle; b) an evaporative cooling tower provided in the cooling water circuit to make the cooling water come into contact with the outside air and radiate heat; c) a cooling water tank provided in the cooling water circuit to store the cooling water; Electric conductivity detecting means for detecting the electric conductivity of the cooling water stored in the water tank; e) drainage means for discharging the cooling water in the cooling water tank; and f) supplying the cooling water into the cooling water tank. G) a cooling water drainage operation of the cooling water in the cooling water tank when the conductivity of the cooling water detected by the conductivity detecting means is higher than a predetermined conductivity. Instruct the water supply means to An air conditioner, comprising: dilution control means for diluting cooling water in a tank. 2. The air conditioner according to claim 1, wherein the refrigeration cycle includes: h) heating means for heating the absorbing liquid; and i) heating the absorbing liquid with the heating means to vaporize a part of the absorbing liquid. A regenerator; j) a condenser for cooling and liquefying the vaporized refrigerant generated in the regenerator; k) an evaporator for evaporating the liquefied refrigerant liquefied in the condenser at a low pressure; and l) an evaporator. An absorption type refrigeration cycle comprising: an absorber for absorbing the evaporated vaporized refrigerant into an absorption liquid; and m) a solution pump for pumping the absorption liquid in the absorber to the regenerator. An air conditioner, wherein an absorber absorbs heat absorbed and circulates cooling water for cooling a vaporized refrigerant in the condenser. 3. The air conditioner according to claim 1, wherein the water supply means includes: n) a water supply valve for opening and closing a water supply passage; and the cooling water tank: o) cooling water having a predetermined water level or higher. An overflow port for discharging, the dilution control means, when the conductivity of the cooling water detected by the conductivity detecting means becomes higher than a predetermined conductivity, open the water supply valve and into the cooling water tank. An air conditioner, wherein a predetermined amount of cooling water is discharged from the overflow port of the cooling water tank by supplying water and continuously supplying water even after the water level in the cooling water tank exceeds the overflow port. . 4. An air conditioner according to claim 1, wherein said electric conductivity detecting means also serves as an electrode of a water level sensor for detecting a water level in said cooling water tank. .