KR100199252B1 - Absorption type air conditioner - Google Patents

Abstract

[assignment]

In addition to suppressing an increase in the concentration of the cooling water cooled by the evaporative cooling tower 61, the drain valve, which is easily broken, is closed to reduce the probability of failure of the absorption air conditioner 1.

[Resolution]

A cooling water tank 65 for storing the cooling water is formed below the cooling tower 61, and the cooling water tank 65 is 14 The above cooling water is provided with the overflow hole 6 which drains outside. The cooling water tank 65 has an internal quantity of 12 The 'low' level sensor 71 for detecting whether or not is installed, and the control device 6 has a coolant amount of 12 in the coolant tank 65. When lowered below, open the water supply valve 60 and Of the coolant is replenished in the coolant tank (65). 2 in addition to replacement Cooling water is added to the cooling water tank 65, whereby the concentration of the cooling water is diluted. And 2 Excess coolant is discharged into the flow hole 66 so that a drain valve is unnecessary.

Description

Absorption HVAC

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

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

3 is a flowchart showing the operation of the blowdown driving means by the control device (first embodiment).

4 is an explanatory diagram for replenishing cooling water with a water supply tank.

5 is a schematic view of a cooling tower including a feed tank (second embodiment).

6 is a schematic view of a water supply tank (second embodiment).

* Explanation of symbols for main parts of the drawings

1: Absorption type air conditioner 2: Heating means

3: absorption refrigeration cycle 5: cooling water cooling means

6: controller 15: high temperature regenerator

16: low temperature regenerator 17: condenser

18: evaporator 19: absorber

48: solution pump 59: water supply pipe (water supply means)

59a: overflow water supply means (water supply means)

60: water supply valve 61: cooling tower

62: cooling water circuit 65: cooling water tank

66: overflow hole 71: 'low' level oath

72: 'high' level sensor

[TECHNICAL FIELD OF THE INVENTION]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption type air conditioner capable of cooling the room using an absorption refrigeration cycle. In particular, the absorption refrigeration cycle takes away heat of absorption and cools the cooling water for condensing the vaporized refrigerant. It's about technology.

[Prior art]

In the absorption refrigeration cycle, a cooling water for absorbing the heat of absorption generated when the vaporized refrigerant is absorbed into the absorbent liquid in the absorber and cooling the vaporized refrigerant in the condenser to liquefy condensation is used.

This cooling water is cooled and reused in a cooling tower provided outside of the absorption refrigeration cycle. That is, the cooling water flows in the cooling water circuit which is heated in the absorption refrigeration cycle and cooled in the cooling tower.

BACKGROUND ART As a cooling tower for cooling cooling water, an evaporation type is known in which cooling water is brought into contact with outside air to radiate heat, and a portion of the cooling water is evaporated to extract vaporization heat from the cooling water to cool the cooling water.

[Problem to Solve Invention]

In the evaporative cooling tower, as described above, since the coolant comes into contact with the outside air, dust, soot, and the like contained in the outside air adhere to the coolant to contaminate the coolant. On the other hand, in the evaporative cooling tower, as described above, part of the cooling water evaporates and flows into the outside air. For this reason, if only the reduced cooling water is replenished each time the cooling water is evaporated and reduced, the concentration of the cooling water in the cooling water circuit gradually increases due to the mineral components (Mg, Ca, etc.) supplied in the cooling water, dust or soot mixed therein.

If the concentration of the cooling water is thickened by impurities such as dust or soot, there is a possibility that odor due to contamination of the cooling water occurs in the cooling tower, or the cooling water circuit is clogged with impurities.

Therefore, in cooling the cooling water by using an evaporative cooling tower, the drain valve installed at the lower part of the cooling water tank in which the cooling water is stored is drained to drain a part of the cooling water, and then the drain valve is closed to replenish the cooling water into the cooling water tank. Increasing the concentration of the cooling water is prevented by performing a blow down operation.

In this way, the drain valve is opened and closed every blowdown to prevent the concentration of the cooling water from rising. However, there is a problem that the drain valve is prone to failure due to adhesion of dust or soot mixed therein.

[Purpose of invention]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide an absorption type air conditioner capable of suppressing an increase in concentration of cooling water cooled by an evaporative cooling tower and reducing the probability of failure by closing the drain valve. have.

[Means for solving the problem]

In order to achieve the above object, the absorption type air conditioner of the present invention employs the following technical means.

[Means of Claim 1]

An absorption type air conditioner includes (a) heating means for heating an absorbent liquid, (b) a regenerator for vaporizing a portion of the absorbent liquid by heating the absorbent liquid by the heating means, a condenser for cooling and liquefying a vaporized refrigerant generated in the regenerator, and An absorption refrigeration cycle having an evaporator for evaporating the liquefied refrigerant liquefied in a condenser at low pressure, an absorber for absorbing the vaporized refrigerant evaporated in the evaporator into the absorbent liquid, and a solution pump for pumping the absorbent liquid in the absorber into the regenerator; A cooling water circuit for removing the heat of absorption from the absorber and circulating the cooling water for cooling the vaporized refrigerant in the condenser, and (d) an evaporative cooling tower installed in the cooling water circuit for radiating the cooling water by contacting the outside air; (e) installed in the cooling water circuit to store cooling water and to discharge cooling water of a predetermined level or more; A cooling water tank having a bubble hole, (f) water supply means for supplying cooling water into the cooling water tank, (g) a water supply valve for opening and closing the water supply means, and (h) the blowdown indication signal is issued. And a control device for opening the valve, discharging a predetermined amount of cooling water through the overflow hole of the cooling water tank, and closing the water supply valve.

[Means of Claim 2]

In the absorption type air conditioner of claim 1, wherein the cooling water tank comprises a 'low' level sensor for detecting a 'low' level level set lower than the overflow hole, and the control device includes: The low level sensor detects the low level level as the blowdown command signal.

[Means of Claim 3]

In the absorption type air conditioner of claim 2, the cooling water tank comprises a 'high' level sensor which detects a 'high' level level higher than the 'low' level level and below the overflow hole. And the control device counts the water supply time until the 'high' level sensor detects the 'high' level level after the 'low' level sensor detects the 'low' level level. And valve opening time determining means for determining a valve opening time of the water feed valve.

[Means of Claim 4]

In the absorption type air conditioner according to claim 2, the control device, when the water supply valve is opened when the cooling water tank is empty, when the 'low' level sensor detects the 'low' level level from the opening after the opening Time measurement means for measuring the time to and the valve opening for determining the valve opening time of the water supply valve when the 'low' level sensor detects the 'low' level water level according to the time measured by the time measuring means A time determining means is provided.

[Means of Claim 5]

In the absorption type air conditioner according to claim 1, the control device includes a count for counting an operation time, and a blowdown instruction signal is issued to the control device itself whenever the count time by the counter reaches a predetermined time. It is characterized by.

[Effects and Effects of the Invention]

[Operation and effects of claim 1]

The control device opens the water supply valve upon receiving the blowdown instruction signal. When the water supply valve is opened, the cooling water is supplied into the cooling water tank by the water supply means. The controller closes the water supply valve after overflowing the cooling water to the overflow hole of the cooling water tank.

In this way, upon receiving the blowdown instruction signal, the cooling water supply to the cooling water tank and the cooling water drainage from the cooling water tank to the outside are simultaneously performed, whereby the concentration of the cooling water in the cooling water tank is reduced.

In the absorption type air conditioner of claim 1, since the drain valve which was easy to fail is not used, an increase in the concentration of the cooling water can be prevented. Therefore, in the means for preventing the increase in the concentration of the cooling water, the probability of failure can be suppressed to be low, and as a result, the reliability of the absorption type air conditioner can be improved.

[Operation and Effect of Claim 2]

As the cooling water evaporates by the cooling tower, the water level in the cooling water tank is lowered. When the water level in the coolant tank is lowered to the 'low' level level, the 'low' bevel sensor outputs a signal (blow down indication signal) meaning that the level is lowered to the 'low' level level. Then, the control device opens a water supply valve and performs a blowdown operation of overflowing the coolant to the overflow hole of the coolant tank.

When the amount of evaporation of the cooling water by the cooling tower is large, the concentration of the cooling water rapidly increases. On the contrary, when the amount of cooling water is small, the concentration of the cooling water increases slowly. Therefore, in the absorption type air conditioner of claim 2, when the amount of evaporation of the cooling water is large, the frequency of lowering to the 'low' level water level becomes high, and frequent blowdown operation is performed to suppress the increase in concentration of the cooling water, and to reduce the evaporation amount of the cooling water. In this case, there is less blowdown operation. That is, the blowdown operation is automatically performed as the concentration of the cooling water rises.

[Operation and effects of claim 3]

When the water level in the coolant tank drops to the 'low' level, the control unit opens the feed valve to supply coolant to the coolant tank. On the other hand, the control device counts the time until the 'high' level sensor detects the 'high' level level after the 'low' level sensor detects the 'low' level level.

The count time is short when the cooling water supply speed is high, and conversely, when the cooling water supply speed is low. Therefore, the control device shortens the valve opening time of the water supply valve when the count time is short, and conversely, by increasing the valve opening time of the water supply valve when the count time is long, the amount of cooling water drained to the overflow hole is kept constant. Keep it.

In claim 3, by determining the valve opening time of the water supply valve in accordance with the supply speed of the cooling water, the amount of cooling water discharged to the overflow hole can always be maintained at almost constant amount, and as a result, the lack of dilution is prevented. Excessive supply of cooling water can be prevented.

[Operation and effects of claim 4]

When the absorption air conditioner is newly installed or when the cooling water tank is completely drained, such as when the cooling water tank is drained completely, the time measurement means formed on the control device is a low level sensor after the water supply valve is opened. Measure the time until the 'level' level is detected.

The measurement time is changed by water pressure or the like at the location where the absorption type air conditioner is installed. The measurement time is short when the supply speed of the cooling water is high, and conversely when the supply speed of the cooling water is low.

Thus, when the low level sensor detects the low level level, the control device shortens the measurement time when the valve opening time of the water supply valve is measured by the time measuring means. Lengthens. As a result, the amount of cooling water discharged to the overroll hole can be maintained at a substantially constant amount depending on the water pressure or the like at the place provided in the absorption type air conditioner.

According to claim 4, in the apparatus provided with the absorption type air conditioner, the amount of cooling water discharged to the overflow hole in accordance with water pressure or the like can always be maintained at almost constant amount. As a result, the lack of dilution can be prevented and the excessive supply of cooling water can be prevented.

On the other hand, in claim 4, the amount of cooling water discharged to the overflow hole can be maintained at almost constant amount without using the 'high' level sensor which detects the water level higher than the 'low' level water level. As such, the cost can be reduced by not using a 'high' level sensor.

In addition, even though the 'high' level sensor detects the 'high' level level, there is no malfunction such as logic failure, such as the 'low' level sensor does not detect the 'low' level level.

[Operation and Effect of Claim 5]

The control device opens the water supply valve every time the operation time reaches a predetermined time, and supplies an excess amount of cooling water into the cooling water tank and overflows it to lower the concentration of the cooling water in the cooling water tank.

In claim 5, the cost of the absorption type air conditioner can be reduced by the blowdown operation without using the water level sensor.

[Embodiment of the Invention]

EMBODIMENT OF THE INVENTION Hereinafter, the absorption type air conditioning apparatus of this invention is demonstrated in detail based on the Example shown in drawing.

[Configuration of First Embodiment]

1 to 4 show a first embodiment, and FIG. 1 is a schematic configuration diagram of an absorption type air conditioner using a dual-efficiency absorption refrigeration cycle that performs indoor air conditioning.

[Schematic Description of Absorption Air Conditioning Device 1]

The absorption type air conditioner 1 to which the present embodiment is applied is a relatively small one used for home use. The heating means 2 for heating the absorption liquid (lithium bromide aqueous solution in this embodiment) is divided into two types of An indoor air conditioning means (4) for air conditioning the room with an absorption refrigeration cycle (3) and cold / hot water (heat medium for cooling / heating the room, water in this embodiment) cooled or heated by the absorption refrigeration cycle (3); Cooling water cooling means (5) for cooling the cooling water mainly used to cool the vaporized refrigerant (steam in this embodiment) in the absorption refrigeration cycle (3), and a control device (6) for controlling each mounted electric functional component. It is composed.

[Description of Heating Means 2]

The heating means 2 of the present embodiment is a gas combustion device that burns gas as fuel to generate heat, and heats the absorbing liquid with the generated heat, and includes a gas burner 11 for burning the gas and the gas burner 11. And a gas supply means 12 for supplying gas to the gas, and a combustion fan 13 for supplying combustion air to the gas burner 11.

The boiler 14 of the absorption type refrigeration cycle 3 is heated with heat obtained by gas combustion of the gas burner 11 to heat the low concentration absorbent liquid supplied into the boiler 14.

[Description of Absorption Refrigeration Cycle 3]

The absorption refrigeration cycle (3) includes a boiling unit (14) heated by the heating means (2), and the refrigerant contained in the low concentration absorption liquid is heated by heating the low concentration absorption liquid supplied into the boiling unit (14). ) Is a medium concentration supplied from the shaft of the high temperature regenerator 15 using a pressure difference using the high temperature regenerator 15 to vaporize (evaporate) the medium concentration absorbing liquid and the heat of condensation of the vaporized refrigerant in the high temperature regenerator 15. By heating the absorbent liquid, the low temperature regenerator 16 which vaporizes the refrigerant contained in the medium concentration absorbent liquid as the high concentration absorbent liquid, and the vaporized refrigerant (water vapor) in the high temperature regenerator 15 and the low temperature regenerator 16 A condenser 17 for cooling and liquefying, an evaporator 18 for evaporating the weakened refrigerant (water) liquefied in the condenser 17 under a pressure close to vacuum, and a vaporized refrigerant evaporated by the evaporator 18 at a low temperature. Get from player 16 It consists of the absorber 19 for absorbing a highly concentrated absorbing solution.

[Description of High Temperature Regenerator 15]

The high temperature regenerator 15 is provided with the above-mentioned boiler 14 which heats the low concentration absorption liquid by the heating means 2, and the boiling cylinder 21 extended upward from this boiler 14. As shown in FIG.

The vaporized refrigerant boiled in the boiling vessel 14 and the boiling vessel 21 and vaporized in the low concentration absorbent liquid is sucked into the cylindrical high temperature regeneration vessel 22 in the boiling vessel @ 1. The high temperature vaporized refrigerant sucked into the high temperature regeneration vessel 22 is cooled by depriving heat as the heat of vaporization when the medium concentration absorbent liquid in the low temperature regenerator 16 evaporates by the wall of the high temperature regeneration vessel 22 to cool the liquefied refrigerant ( Water).

In the high temperature regenerator 22, in order to insulate the medium concentration absorbent liquid in the boiling vessel 21 and the liquefied refrigerant (mole) which remain around it after it is heated in the boiler 14 and the refrigerant | coolant in a low concentration absorbent liquid is vaporized, An adiabatic partition cylinder 24 is provided around the boiling tube 21. The heat insulation partition tube 24 has the upper end joined to the upper end of the boiling cylinder 21, and the lower end is provided with the gap between the boiling cylinder 21, and is between the boiling cylinder 21 and the heat insulation partition cylinder 24. It is formed to intrude air.

In addition, the liquefied refrigerant (mole) liquefied in the high temperature regeneration container 22 and separated to the outside of the heat insulation partition tube 24 is led to the condenser 17 through the liquefied refrigerant pipe 25 connected to the lower portion.

[Description of Low Temperature Regenerator 16]

The low temperature regeneration container 16 includes a low temperature regeneration container 31 having a through container shape surrounding the high temperature regeneration container 22.

On the other hand, the medium absorbent liquid in the boiling vessel 21 is supplied to the low temperature regenerator 16 through the medium absorbent liquid tube 26 connected to the lower part of the boiling vessel @ 1. In addition, the medium absorbent liquid pipe 26 is provided with decompression means 27 such as an orifice. When the cooling / heating switching valve 53, which will be described later, is closed, the depressurizing means 27 flows the medium absorbent liquid in a state in which the high temperature regenerator 15 maintains the pressure difference between the low temperature regenerator 16, and the cooling / heating means. When the switching valve 53 is opened, the medium absorbing liquid hardly flows.

The low temperature regenerator 16 injects the medium absorbent liquid supplied through the medium absorbent liquid tube 26 toward the ceiling portion of the high temperature regenerator 22.

Since the temperature in the low temperature regeneration vessel 31 is lower than the temperature in the high temperature regeneration vessel 22, the pressure in the low temperature regeneration vessel 31 is lower than the pressure in the high temperature regeneration vessel 22. Therefore, the medium absorbent liquid supplied from the medium absorbent liquid pipe 26 into the low temperature regeneration container 31 is likely to evaporate. Then, when the medium absorbent liquid is injected into the ceiling portion of the high temperature regeneration container 22, the medium absorbent liquid is heated by the wall of the high temperature regeneration container 22, so that a part of the refrigerant contained in the medium absorbent liquid evaporates to evaporate the refrigerant. The remainder becomes a high concentration absorbent liquid.

Here, the upper side of the low temperature regeneration container 31 is in communication with the upper side of the condensation container 32 of the annular container shape by the communication portion 33. Therefore, the vaporized refrigerant evaporated in the low temperature regeneration container 31 is supplied into the condensation container 32 through the communication section 33.

On the other hand, the high concentration absorbent liquid is dropped into the lower portion of the low temperature regeneration container 31 and supplied to the absorber 19 through the high concentration absorbent liquid tube 34 connected to the lower portion of the low temperature regeneration container 31.

In addition, a ceiling plate 35 is installed on the upper side of the low temperature regeneration container 31, and a gap 36 is formed between the outer periphery of the ceiling plate 35 and the low temperature regeneration container 31 through which the vaporized refrigerant passes. have.

[Description of Condenser 17]

The condenser 17 is covered by the condensation container 32 of the annular container shape. The condensation heat exchanger 37 which cools and liquefies the vaporization refrigerant in the condensation container 32 inside the condensation container 32 is arrange | positioned. The heat exchanger 37 for condensation is an annular coil, in which cooling water flows. The vaporized refrigerant supplied from the low temperature regenerator 16 into the condensation vessel 32 is liquefied by being cooled by the heat exchanger 37 for condensation, and then dropped into the lower side of the heat exchanger 37 for condensation.

On the other hand, the refrigerant is supplied to the lower side of the condensation vessel 32 through the liquefied refrigerant pipe 25 in the high temperature regenerator 15. Moreover, when this supply refrigerant is supplied into the condensation vessel 32, it is boiled again by the pressure difference (low pressure of about 70 mmHg in the condensation vessel 32), and is supplied in the state which mixed vaporization refrigerant and a liquefied refrigerant. The condensation vessel 32 is also connected with a liquefied refrigerant supply pipe 38 for guiding the liquefied refrigerant to the evaporator 18. The liquefied refrigerant supply pipe 38 is provided with a refrigerant valve 39 for controlling the supply amount of the liquefied refrigerant supplied from the condensation vessel 32 to the evaporator 18.

[Description of Evaporator 18]

The evaporator 18 is installed in the lower portion of the condensation vessel 32 together with the absorber 19 and is covered by the annular vessel-shaped evaporation absorption vessel 41 provided around the low temperature regeneration vessel 31. An evaporation heat exchanger 42 for evaporating the liquefied refrigerant supplied from the condenser 17 is disposed outside the evaporation absorption container 41. The evaporation heat exchanger 42 is an annular coil, in which cold and hot water (heat medium) supplied to the indoor air conditioning means 4 flows. The liquefied refrigerant supplied from the condenser 17 through the liquefied refrigerant supply pipe 38 is sprayed onto the evaporation heat exchanger 42 in the annular refrigerant spray port 43 in which the evaporative heat exchanger 42 is disposed. do.

Since the inside of the evaporation absorption container 41 is maintained at almost a vacuum (for example, 6.5 mmHg), the boiling point is low and the liquefied cooling water sprayed on the evaporation heat exchanger 42 is very easy to evaporate. The liquefied refrigerant sprayed on the heat exchanger 42 for evaporation removes heat of vaporization from the heat medium flowing in the heat exchanger 42 for evaporation and evaporates.

As a result, the heat medium flowing in the heat exchanger 42 for evaporation is cooled. Then, the cooled heat medium is guided to the indoor air conditioner 4 to cool the room.

[Description of Absorber 19]

The absorber 19 is covered by the evaporative absorption container 41 as described above. In the absorber 19, an absorption heat exchanger 44 for cooling the high concentration absorbent liquid supplied from the high concentration absorbent liquid tube 34 is disposed inside the evaporative absorption container 41. The absorption heat exchanger 44 is an annular coil, in which cooling water for cooling the high concentration absorption liquid sprayed onto the coil is supplied. In addition, the cooling water that has passed through the absorption heat exchanger 44 passes through the condensation heat exchanger 37 of the condenser 17 and is then cooled by the cooling water cooling means 5. Then, the cooling water cooled by the cooling water cooling means 5 is guided to the absorption heat exchanger 44 again.

On the other hand, in the upper part of the absorption heat exchanger 44, the annular absorption liquid spraying port 45 which distributes the high concentration absorbent liquid supplied from the high concentration absorbent liquid pipe 34 to the absorption heat exchanger 44 is arrange | positioned. The high concentration absorbent liquid sprayed on the absorption heat exchanger 44 absorbs the vaporized refrigerant generated by evaporation in the heat exchanger 42 for evaporation while being dropped from the upper side to the lower side along the coil surface of the absorption heat exchanger 44. . As a result, the absorbent liquid dropped to the bottom of the evaporative absorption container 41 becomes a low concentration absorbent liquid whose concentration is thinned.

A cylindrical partition wall 46 is disposed in the evaporation absorption container 41 between the evaporation heat exchanger 42 and the absorption heat exchanger 44. The upper part of the cylindrical partition wall 46 is open so that the evaporation heat exchanger 42 and the absorption heat exchanger 44 may communicate, and the vaporization refrigerant produced by the evaporator 18 may be cylindrical partition wall 46. Guided into the absorber 19 through the top of the.

In addition, a low concentration absorbent liquid pipe 47 for supplying the low concentration absorbent liquid dropped into 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 concentration absorbent liquid pipe 47 is provided with a solution pump 48 for supplying the low concentration absorbent liquid to the boiling water 14 in the evaporative absorption container 41 which is almost vacuum.

[Description of Components Other Than Above in Absorption-type Refrigeration Cycle 3]

Reference numeral 51 shown in FIG. 1 denotes a high temperature heat exchanger 51a for heat-exchanging the medium absorbent liquid flowing in the boiling vessel 21 to the low temperature regenerator 16 and the low concentration absorbent liquid flowing from the absorber 19 to the boiler 14. And a low temperature heat exchanger 51b for heat-exchanging the high concentration absorbent liquid flowing from the low temperature regenerator 16 to the absorber 19 and the low concentration absorbent liquid flowing from the absorber 19 to the boiler 14.

In addition, the high temperature heat exchanger 51a cools the medium concentration absorbent liquid flowing from the boiling cylinder 21 to the low temperature regenerator 16, and conversely, heats the low concentration absorbent liquid flowing from the absorber 19 to the boiler 14. The low temperature heat exchanger 51b cools the high concentration absorbent liquid flowing from the low temperature regenerator 16 to the absorber 19 and heats the low concentration absorbent liquid flowing from the absorber 19 to the boiler 14.

In this embodiment, the absorption type refrigeration cycle (3) is provided with heating operation means for heating operation in addition to the cooling operation by the above operation.

The heating operation means includes a heating tube 52 for guiding a hot absorbent liquid to the lower part of the evaporator 18 at the lower part of the boiling tube 21 and a cooling / heating switching valve 53 for opening and closing the heating tube 52. It consists of. The cooling / heating switching valve 53 opens the valve at the time of heating operation and guides the hot absorbent liquid into the evaporative absorption container 41 to draw the cold / hot water flowing through the evaporator 18 in the evaporation heat exchanger 42. To heat.

[Description of Indoor Air Conditioning Means 4]

The indoor air conditioning means (4) forcibly heat-exchanges indoor and outdoor air with cold / hot water passing through the indoor heat exchanger (54) installed inside the room, and the evaporator (18) flowing through the indoor heat exchanger (54), and converts the heat-exchanged air into the room. An indoor fan 55 for supplying is provided.

The indoor heat exchanger 54 is connected with a cold and hot water circuit 56 for circulating cold and hot water, and the cold and hot water circuit 56 is provided with a cold and hot water pump 57 for circulating cold and hot water. In addition, the cold / hot water pump 57 is driven by a combined motor for driving the solution pump 48.

The cold and hot water circuit 56 is a hot and cold water pipe that guides the cold and hot water that has passed through the evaporator 18 to the indoor heat exchanger 54, and guides the cold and hot water that has been heat-exchanged with the indoor air to the evaporator 18. In addition to the above-described indoor heat exchanger 54 and the cold / hot water pump 57, the tank has a function as an expansion tank for heating cold and hot water and a water tank 58 for replenishing cold and hot water in the cold / hot water circuit 56. do.

The water tank 58 is connected with a water supply pipe 59 for supplying cold and hot water (tap water) therein. The water supply pipe 59 is provided with a water supply valve 60 for supplying / stopping cold / hot water into the water tank 58. The water tank 58 is provided with a water level sensor (not shown). When the coolant level in the water tank 58 decreases, the water tank 58 is opened to replenish the cold and hot water into the water tank 58. .

In addition, the water tank 58 is formed with an overflow water supply unit 59a for guiding the overflowed cold / hot water into the cooling water tank 65 described later. That is, a water supply means for supplying cooling water into the cooling water tank 65 by the water supply pipe 59 and the overflow water supply means 59a is configured.

[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 the cooling water, and a cooling water pump 63 for circulating the cooling water in the cooling water circuit 62.

The cooling tower 61 heats and cools down the cooling water that has passed through the absorber 19 and the condenser 17 by exchanging heat with the outside air while the cooling water flows from the upper side to the lower side. To cool the cooling water by extracting the water from the upper side, a spraying unit 61a for spraying the cooling water from the upper side, an evaporation unit 61b having a large surface area through which the cooling water flows, and a collecting unit for collecting the cooling water passing through the evaporation unit 61b ( 61c). Moreover, the said cooling tower 61 is comprised by the collection part 61c which collects the cooling water which passed the evaporation part 61b. In addition, the cooling tower 61 includes a cooling water fan 64 that generates an air flow in the evaporator 61b to promote evaporation and cooling of the cooling water in the evaporator 61b.

The cooling water circuit 62 guides the cooling water whose temperature has risen through the absorber 19 and the condenser 17 to the cooling tower 61, and again directs the cooling water cooled in the cooling tower 61 to the absorber 19 and the condenser. As a water pipe sent to (17), the cooling water circuit 62 includes a cooling water tank 65 for storing cooling water in addition to the cooling tower 61 and the cooling water pump 63 described above.

The cooling water tank 65 is installed below the cooling tower 61 or below the water tank 58 so that the cooling water passing through the cooling tower 61 is supplied and the water overflowed from the water tank 58 is supplied. Formed.

As shown in FIG. 2, the cooling water tank 65 has a predetermined amount therein (for example, 14 ) Is stored, and the overflow hole 66 is formed so that further cooling water may overflow to the outside. Around the overflow hole 66, a guide container 67 is formed to prevent the cooling water supplied to the cooling water tank 65 from being directly discharged to the overflow hole 66 without being used for dilution. The coolant tank 65 is divided into two by the guide container 67, and the cooling water overflowed by the dust, soot, etc. mixed by water supply to the side where the overflow hole 66 is not formed. It is easy to drain to the hole 66. The cooling water discharged to the overflow hole 66 is discharged downward through the drain pipe 68 connected to the overflow hole 66.

In addition, the coolant tank 65 has a 'low' level water level set to be lower than the overflow hole 66 (for example, 2 degrees above the water level defined by the overflow hole 66). 12 less 'Low' level sensor 71 is installed to detect the water level, and the 'high' level level is set lower than the overflow hole 66 and higher than the 'low' level level (e.g., 'low' level level). Than 1 Lot 13 High level sensor 72 is installed.

Then, when the 'low' level sensor 71 detects the 'low' level level, the blowdown driving means of the control device 6 operates by receiving the detection signal (blow down instruction signal). This blowdown driving means (detailed later) opens the water supply valve 60 when the low level sensor 71 detects the low level level. The water supply valve 60 is opened and water overflowed from the water tank 58 flows into the cooling water tank 65 through the overflow water supplying means 59a and is supplied as cooling water into the cooling water tank 65. The predetermined water level 14 which is the height of the overflow hole 65 Even after replenishment up to a certain level (eg 2 The abnormal cooling water is supplied into the cooling water tank 65, and the excessively supplied cooling water overflows the overflow hole 66, and then the water supply valve 60 is closed by the blowdown driving means. That is, even after the completion of the replenishment of the cooling water into the cooling water tank 65, the cooling water is supplied to the cooling water tank 65 by an excessive amount of cooling water, and the cooling water is diluted, and the excessively supplied cooling water is discharged to the outside through the overflow hole 66. do.

[Description of Control Unit 6]

The control device 6 is the refrigerant valve 39, the solution pump 48, the hot and cold water pump 57, the indoor fan 55, the cooling / heating switching valve 53, the water supply valve 60, the cooling water pump ( 63), electric functional parts such as the cooling water fan 64, and electric functional parts of the heating means 2 (burning fan 13, gas flow control valve 73, gas open / close valve 74, ignition device 75, etc.) ) Is energized and controlled according to an operation instruction of a controller (not shown) manually set by a user or input signals of a plurality of installed sensors.

[Explanation of blowdown driving means]

As described above, when the 'low' level sensor 71 installed in the coolant tank 65 detects the 'low' level level, the control means 6 opens the water supply valve 60 to cool the coolant into the coolant tank 65. In addition to the replenishment, a blowdown operation means for supplying the cooling water in an excess amount by a predetermined amount into the cooling water tank 65 to dilute the cooling water.

A control example of the water supply valve 60 by the blowdown driving means will be described using the flowchart of FIG.

When the control apparatus 6 starts to operate, it determines first whether the "low" level sensor 71 detected the "low" level water level (step S1). If this determination result is NO, the flow returns to step S1. On the contrary, if the determination result is YES, the water supply valve 60 is opened to start supply of cooling water to the cooling water tank 65 (step S2).

Next, it is determined whether the 'high' level sensor 72 has detected the 'high' level water level (step S3). If the determination result is No, the flow returns to step S3. On the contrary, if the determination result is YES, the valve opening time of the water supply valve 60 is determined from the count time from detecting the 'low' level level to detecting the 'high' level level (step S4; valve opening). Operation of time determining means). Specifically, after detecting the 'low' level water level 1 until the 'high' level water level is detected. After the coolant is supplied to the coolant tank 65 and detects the 'high' level water level 3 If the coolant is supplied, the valve opening time of the water supply valve 60 is determined as (count time from detecting the 'high' level water level to detecting the 'high' level water level) × 4. The time from the detection of the 'high' level water level until the water supply valve 60 is closed may be determined as (count time) x 3.

Next, after detecting the 'low' level water level, it is determined whether or not the valve opening time determined in the step S4 has elapsed (step S5). If the determination result is NO, the process returns to step S5. On the contrary, if the determination result is YES, the cooling water tank 65 is set to 4. It is judged that the coolant is supplied, the water supply valve 60 is closed (step S6), and then returned.

[Operation of the Example]

Subsequently, the operation of the cooling operation of the absorption type air conditioner 1 and the operation of the blowdown operation at the time of performing this cooling operation will be described.

[Explanation of operation of cooling operation]

When the absorption type air conditioner 1 is activated, the heating means 2 and the absorption type refrigeration cycle 3 are operated by operation on each electric functional part.

The absorption refrigeration cycle (3) is obtained by evaporating refrigerant from the low concentration absorbent liquid in the high temperature regenerator (15) by heating the boiler (14) of the heating means (2) and vaporizing from the medium concentration absorbent liquid in the low temperature regenerator (16). A refrigerant is obtained.

The vaporized refrigerant obtained by the high temperature regenerator 15 and the low temperature regenerator 16 is condensed and liquefied in the condenser 17, and then sprayed onto the evaporation heat exchanger 42 of the evaporator 18, and the evaporation heat exchanger 42 The vaporization heat is taken away from the cold and hot water inside and evaporated. Therefore, the cold and hot water cooled through the evaporation heat exchanger 42 is supplied to the indoor heat exchanger 54 of the indoor air conditioning means 4 to cool the room.

The vaporized refrigerant evaporated in the evaporator 18 passes through the upper side of the cylindrical partition wall 46 and flows into the absorber 19.

On the other hand, in the absorber 19, the high concentration absorbent liquid supplied from the low temperature regenerator 16 is sprayed on the absorption heat exchanger 44, and the vaporized refrigerant which flowed in from the evaporator 18 is absorbed by this high concentration absorbent liquid. In addition, the heat of absorption generated when the vaporized refrigerant is absorbed in the high concentration absorbent liquid is absorbed by the heat exchanger 44 for absorption, thereby preventing a decrease in the absorption capacity.

In addition, the high concentration absorbent liquid absorbing the vaporization refrigerant in the absorber 19 becomes a low concentration absorbent liquid and is returned to the boiler 14 by the solution pump 48 again, and the above cycle is repeated.

[Description of operation of blowdown driving means]

The cooling water heated in the condenser 17 and the absorber 19 during the cooling operation by the absorption refrigeration cycle 3 is blown by the outside air blown by the cooling water fan 64 in the evaporator 61b of the cooling tower 61. In addition to the forced heat dissipation, part of the cooling water is evaporated. Therefore, the cooling water of the predetermined water level (water level reaching the overflow hole 66) gradually decreases due to the blowdown operation of the cooling water.

When the coolant evaporates and the water level inside the coolant tank 65 reaches the 'low' level water level, the controller 6 opens the water supply valve 60 to Is supplied to the cooling water tank (65). Supplied 4 2 of the first among the coolant Is used to refill the coolant tank (65), the remaining two Is used for cooling water dilution. That is, excess coolant 2 in the coolant tank 65 The coolant is diluted by supplying Coolant is drained out to the overflow hole (66).

Next, the equilibrium concentration of cooling water is demonstrated.

First, as shown in Fig. 4 (a), when the water level reaches the predetermined level, the amount of cooling water in the cooling water tank 65 is H, and the concentration magnification at that time is x. Here, as shown in FIG. 4 (b), when the amount of cooling water is added to dilute the cooling water, the concentration ratio of the cooling water can be expressed by the following equation. When the amount of cooling water is added, the excess cooling water is discharged to the overflow hole 66, and as shown in FIG. 4C, the water level returns to the predetermined water level, and the amount of cooling water in the cooling water tank 65 is Is maintained at H.

Cooling water is evaporated in the cooling tower 61, the concentration ratio of the cooling water when the amount of cooling water evaporates as shown in FIG. Can be expressed as:

As shown in FIG. 4E, the concentration ratio of the cooling water when the amount of cooling water is supplied into the cooling water tank 65 can be expressed by the following equation.

That is, since the concentration magnification of the fourth degree (a) and the fourth degree (e) in the equilibrium state is the same, the concentration magnification x (ave) of the equilibrium state can be expressed by the following equation. In addition, under the condition of the calculation setting, the evaporation content is not considered in the water supply, and the concentration ratio in the cooling water tank 65 is assumed to be uniform.

Here, the amount of water H at which the coolant in the coolant tank 65 reaches a predetermined level is 14. , The quantity replenished due to evaporation (E) is 2 , The quantity supplied for dilution (B) is 2 In this case, the equilibrium state (if each value is obtained by substituting the equation 4) is 2.14.

On the other hand, the maximum concentration magnification is the state of FIG. , Quantity E = 2 , Quantity B = 2 ) Is obtained by substituting Eq. 3 into a maximum concentration factor of 2.33.

[Effect of Example]

The absorption type air conditioner 1 uses the overflow hole 66 which overflows and drains cooling water above a predetermined level, and supplies the cooling water tank 65 with a larger amount of cooling water than the amount of cooling water reduced due to evaporation. It is possible to prevent the increase in concentration of the cooling water in the cooling water cooling means 5 by blowing down without using a drain valve that is likely to fail. As such, by not using the drain valve, the probability of failure of the absorption type air conditioner 1 can be reduced as a result and the reliability can be improved.

In addition, when the 'low' level sensor 71 detects the 'low' level water level, the control device 6 opens the water supply valve 60 to perform a blowdown operation. In the case of a large number of down operations, on the contrary, if the amount of evaporation is small, the number of blowdown operations is reduced, resulting in a lack of dilution and suppression of excessive blowdown operations, and an excessive supply of cooling water can be prevented.

In addition, the valve of the water supply valve 60 according to the time from the 'low' level sensor 71 detects the 'low' level level until the 'high' level sensor 72 detects the 'high' level level. Since the opening time is determined, the amount of cooling water discharged from the overflow hole 66 can be maintained at a substantially constant amount regardless of the supply speed changed by the fluctuation of the cooling water supply water pressure, thereby preventing the lack of dilution from the result and the cooling water. Oversupply can be prevented.

Second Embodiment

5 and 6 show a second embodiment, and FIG. 5 is a schematic view of a cooling tower.

[Configuration of Second Embodiment]

In this embodiment, when the water supply valve 60 is opened, the cooling water (tap water) is supplied, for example, directly from the water supply pipe 59 into the cooling water tank 65.

This embodiment does not install the 'high' level sensor 72 (see the first embodiment) shown in the first embodiment, but the amount of cooling water discharged from the overflow hole 66 by the 'low' level sensor 71 alone. Is to maintain a constant amount of.

In order to achieve the above object, the control device 6 of this embodiment is provided with a time measuring means function and a valve opening time determining means function.

The time measuring means, when the absorption type air conditioner (1) is installed to supply the coolant in the coolant tank (65) while the coolant tank (65) is empty, the water level rises after the water supply valve (60) is opened The time until the 'low' level sensor 71 detects the 'low' level water level (predetermined amount) is measured. When the low level sensor 71 outputs an ON signal in a submerged state, when the level of the coolant tank 65 is lowered and the signal of the low level sensor 71 is turned from ON to OF, 'Level level detected. In addition, even when the water level of the coolant tank 65 is raised and the signal of the "low" level sensor 71 changes from OFF to ON, the "low" level level is detected.

In the measurement time, when the water pressure applied to the water supply pipe 59 is low at the place (region, etc.) of the absorption type air conditioner 1, the 'low' level sensor 71 is opened after the water supply valve 60 is opened. When the time until the 'low' level water level is detected becomes long and, on the contrary, when the income from the water supply pipe 59 is high, the 'low' level sensor 71 is 'low' level after the water supply valve 60 is opened. The time until the water level is detected is shortened.

That is, after the water supply valve 60 is opened, the water supply speed of the place where the absorption type air conditioner 1 is installed can be known by the time from the 'low' level sensor 71 to detect the 'low' level.

The valve opening time setting means determines the valve opening time of the water supply valve 60 when the 'low' level sensor 71 detects the 'low' level level according to the time measured by the time measuring means. .

Next, the determination example of the said valve opening time is shown.

The lowest level among the coolant circuits 62 at the bottom of the coolant tank 65 is set, and as shown in FIG. The level of the overflow hole 66 is 9 of the coolant tank 65. It is the water level of 3, and also in case of overflow 3 It is said to be set.

In addition, after the absorption air conditioner (1) is installed and the water supply valve (60) is opened, the water level rises until the low level sensor (71) detects the low level level. .

Then, 3 for 10 seconds the valve opening time of the water supply valve 60 Cooling water is supplied. For this reason, the water level in the coolant tank 65 reaches the overflow hole 66 by opening the water supply valve 60 for 20 seconds after the low level sensor 71 detects the low level level. Also, by opening the water supply valve 60 continuously for 10 seconds, Of the coolant is drained to the overflow hole 66.

That is, whenever the water level decreases during the cooling operation and the 'low' level sensor 71 detects the 'low' level, the water supply valve 60 is opened for 30 seconds. Blowdown operation is performed to drain the cooling water to the overflow hole (66).

[Effect of Second Embodiment]

In this embodiment, the 'high' level sensor 72 shown in the first embodiment is not used, and the amount of cooling water discharged to the overflow hole 66 is always adjusted in accordance with the water pressure at the location where the absorption type air conditioner 1 is installed. It can be kept at a constant amount. As a result, the lack of dilution can be prevented and the excessive supply of cooling water can be prevented.

As such, by not installing the 'high' level sensor 72, the cost of the absorption type air conditioner 1 can be reduced.

In addition, even though the 'high' level sensor 72 detects the 'high' level level, there is no malfunction such as logic failure, such as the 'low' level sensor 71 does not detect the 'low' level level. .

[Modification of Example 2]

In addition, in the second embodiment, although the water level is lowered and the 'low' level sensor 71 detects the 'low' level water level as an example, the blowdown operation is shown as an example, but when the 'low' level water level is detected. The blowdown operation is to be filtered once or every other time. If the blowdown operation is not performed, when the low level level is detected, the coolant so that the water level in the coolant tank 65 becomes the high level level. It may be formed to perform supplementary operation.

The cooling water replenishment operation will be described. The water level and the water pressure of each part are the above conditions, and the "high" level water level is, for example, the coolant tank 65 8 When the water level is lowered and the level is detected and the 'low' level level is detected, the coolant replenishment operation is 5 In order to replenish the cooling water in the cooling water tank 65, the water supply valve 60 is opened for about 16.7 seconds.

In order to prevent the lack of cooling water in the cooling water circuit 62 at the start of operation of the absorption type air conditioning apparatus 1, the absorption type cooling cycle 3 is installed so that the absorption refrigeration cycle 3 is operated after the level of the cooling water always reaches the 'high' level level. In this case, when the 'low' level sensor 71 detects the 'low' level water level at the start of operation and detects that the water level is higher than the 'low' level water level, the water supply valve 60 is opened for about 16.7 seconds to cool the water. Is added to the coolant tank 65 so that at least the level of the coolant reaches the 'high' level level, and the 'low' level sensor 71 does not detect the 'low' level level at the start of operation. When the water level is below the level, the cooling water 8 is opened by opening the water supply valve 60 for about 26.7 seconds. Is replenished in the coolant tank 65 so that at least the coolant level reaches a high level level.

In the second embodiment, the water level rises after the water supply valve 60 is opened at the time of installation of the absorption type air conditioner 1 until the low level sensor 71 detects the low level level. Although the example of measuring the time was provided, the solenoid valve for drainage was installed in the lower part of the cooling water tank 65 to completely drain the cooling water tank 65 at the time of switching from cooling to heating, and then switched to cooling again. After opening 60, the water level rises and the time until the 'low' level sensor 71 detects the 'low' level level may be measured to determine the valve opening time of the water supply valve 60.

In addition, like the drain valve shown in the prior art, the drain solenoid valve does not open and close every blowdown, but has a low opening and closing frequency, and thus has a lower probability of failure than the drain valve of the prior art.

In addition, although the second embodiment has given an example of supplying cooling water directly into the cooling water tank 65 from the water supply pipe 59, as shown in the first embodiment, the cold / hot water (tap water) overflowed from the water tank 58 is a cooling water tank. Formed to be supplied into the (65) to measure the time until the 'low' level sensor 71 detects the 'low' level level after the water supply valve 60 is opened, the water supply valve ( The valve opening time of 60 may be determined.

Third Embodiment

In the above embodiment, the controller 6 opens the water supply valve 60 to blow down when the low level sensor 71 detects the low level level. In the control device 6, a counter (not shown) counts the cooling operation time, and whenever the count time by the count reaches a predetermined time, a signal indicating that the count time has reached a predetermined time (blow down instruction signal) The controller 6 causes the blowdown operation by opening the water supply valve 60 over a predetermined time by the signal.

In this embodiment, since the 'low' level sensor 71 and the 'high' level sensor 72 shown in the first embodiment do not need to be provided, the cost of the absorption type air conditioner 1 can be reduced by reducing the parts thereof. Can be.

[Modification]

In the first embodiment, as the water supply means for supplying the cooling water into the cooling water tank 65, the water supply pipe 59 for inducing water to the water tank 58 and the water overflowed from the water tank 58, the cooling tower 61 Although the overflow water supply means 59a for guiding the cooling water tank 65 through the above is used, as shown in the second embodiment, the cooling water may be introduced directly into the cooling water tank 65.

In the above embodiment, as an example of the absorption refrigeration cycle, a dual-use absorption refrigeration cycle (3) is shown as an example, but may be a single-use absorption refrigeration cycle, or a triple or more multi-effect absorption refrigeration cycle. It may be. Moreover, although the example of inject | pouring from the upper side of the low temperature regenerator 16 was shown when the medium concentration absorption liquid is inject | poured into a low temperature regenerator, you may inject from a lower side.

Although a gas burner 11 is used as a heating source of the heating means 2, an oil burner or an electric heater may be used, or exhaust heat of another apparatus (for example, an internal combustion engine) may be used. Although the condensation heat exchanger 37, the evaporation heat exchanger 42, and the absorption heat exchanger 44 were formed in a coil shape, the heat exchanger of another type such as a tube and fan or a stacked heat exchanger was used. You may also

Lithium bromide aqueous solution is shown as an example of the absorbent liquid, but other absorbent liquids such as ammonia aqueous solution using ammonia as the refrigerant and water as the absorbent may be used.

As an example of the heat medium, tap water is used and the common water is used as the cooling water in the cooling water circuit. However, the cooling water in the cooling water circuit may be another heat medium such as another antifreeze or oil.

During operation of the cooling tower, when the level sensor does not detect the 'low' level water level because the water level in the cooling water tank 65 does not decrease for a predetermined time (for example, 2 hours), the water supply valve 60 supplies water. It may be judged that the cooling water is always being replenished because it cannot be stopped, and it may be formed so as to display to the user that the water supply stop cannot be made by visual display means using a liquid crystal or a lamp or auditory display means using a chime or buzzer.

Claims (5)

(a) heating means for heating the absorbent liquid, (b) a regenerator for vaporizing a portion of the absorbent liquid by heating the absorbent liquid, a condenser for cooling and liquefying the vaporized refrigerant generated in the regenerator, and liquefied in the condenser Absorption refrigeration cycle comprising an evaporator for evaporating the refrigerant under low pressure, an absorber for absorbing the vaporized refrigerant evaporated in the evaporator into the absorbent liquid, a solution pump for pumping the absorbent liquid in the absorber to the regenerator and (c) the heat of absorption in the absorber And a cooling water circuit for circulating the cooling water for cooling the vaporized refrigerant in the condenser, and (d) an evaporation type cooling tower installed in the cooling water circuit to radiate the cooling water to outside air, and (e) the cooling water circuit. And an overflow hole for storing the coolant and discharging the coolant above a predetermined level. (F) a water supply means for supplying cooling water into the cooling water tank, (g) a water supply valve for opening and closing the water supply means, and (h) opening the water supply valve when a blowdown instruction signal is issued, And a control device for closing the water supply valve after discharging a predetermined amount of cooling water through the overflow hole of the cooling water tank. The coolant tank of claim 1, wherein the coolant tank includes a 'low' level sensor configured to detect a 'low' level level set lower than the overflow hole, and the control device includes the 'low' level sensor being 'low'. An absorption type air conditioning apparatus comprising: a signal for detecting a level of water as the blowdown instruction signal; The coolant tank of claim 2, wherein the coolant tank includes a 'high' level sensor that detects a 'high' level level that is higher than the 'low' level level and set below the overflow hole, and the control device includes: After the 'low' level sensor detects the 'low' level water level, the water supply time until the 'high' level sensor detects the 'high' level water level is counted, and the valve of the water supply valve is adjusted according to the count time. An absorption type air conditioning apparatus comprising a valve opening time determining means for determining an opening time. The method of claim 2, wherein the control device, when the water supply valve is opened while the cooling water tank is empty, time after the opening until the 'low' level sensor detects the 'low' level water level. Determination of the valve opening time for determining the valve opening time of the water supply valve when the 'low' level sensor detects the 'low' level level according to the time measuring means for measuring and the time measured by the time measuring means. Absorption air conditioning apparatus comprising a means. 2. The control apparatus according to claim 1, wherein the control apparatus includes a count for counting an operation time, and a blowdown instruction signal is issued to the control apparatus itself whenever the count time by the counter reaches a predetermined time. Absorption air conditioner.