JP2003065625A - Absorption type air conditioning equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a usual indiscriminate diluting operation for a cooling operation conducted after recovery of power when the cooling operation is executed on the occasion of a power failure, considering that there are various cases in the state of the operation at the power failure and therefore the indiscriminate dilution causes waste. SOLUTION: When power recovers in the case of the power failure in the course of the cooling operation, a means for the diluting operation mounted on a controller executes a simple diluting operation when the temperature of a high-temperature regenerator 15 which is stored at the power failure is below 60 deg.C. When this temperature is 60 deg.C or above, simulated cooling is executed according to the condition and the diluting operation is conducted. A useless diluting operation is held down consequently and crystallization can surely be prevented. Since the dilution is conducted by executing the simulated cooling operation according to the condition, an absorbing solution in an absorption type refrigerating cycle 7 can be circulated efficiently and, as the result, a dilution time can be shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption air conditioner using an absorption refrigeration cycle, and more particularly to a dilution operation at the time of restoration when a power failure occurs during operation.

[0002]

2. Description of the Related Art In an absorption type air conditioner, for example, during cooling operation, inside the absorption type refrigeration cycle, a low-concentration absorption liquid having a low concentration (for example, a dilute absorption liquid sent from an absorber to a regenerator), There is a high-concentration absorption liquid (for example, the absorption liquid sent from the regenerator to the absorber) having a high concentration as the refrigerant evaporates.
The high-concentration absorption liquid crystallizes at a higher temperature than the low-concentration absorption liquid.

When the absorption liquid crystallizes inside the absorption refrigeration cycle, the absorption liquid stops flowing at the crystallization portion, and the absorption refrigeration cycle cannot operate. It may be damaged. Therefore, when the cooling operation is stopped, it is necessary to perform the well-known dilution operation in which the concentration of the absorbing liquid is made uniform by operating the solution pump while the operation of the heating means for heating the absorbing liquid is stopped. In addition, when the heating operation is stopped, the absorption liquid is diluted to a uniform concentration, but if it is stopped as it is, a part of the absorption liquid will be concentrated due to residual heat in the high temperature part, and the temperature may decrease in winter. is there. For this reason,
The well-known dilution operation is performed even when the heating operation is stopped.

On the other hand, each operating part of the absorption air conditioner is driven by electric power supplied from a commercial power source. For this reason,
Absorption air conditioners may suddenly shut down due to an unexpected power outage. It is conceivable that the absorbing liquid, which had a high concentration before the power outage, was further concentrated by the residual heat during the power outage and was in a state where it was easily crystallized. For this reason, if, for example, the cooling operation is performed after the recovery from the power failure and before the power failure, the concentration of the absorbent having a higher concentration may increase, and crystallization may occur in the absorption refrigeration cycle. Even during a power failure during the heating operation, the concentration of a part of the absorbing liquid increases due to the residual heat during the power failure as described above, and crystallization may occur when heated in the restart.

Therefore, conventionally, when a power failure occurs, a backup power source such as a capacitor stores in a nonvolatile storage means (for example, EEP-ROM) whether the operating state is cooling operation or heating operation. Every other time, if there is a power failure during cooling operation, dilution suitable for cooling operation is performed after power is restored, and if power failure during heating operation is performed, dilution suitable for heating operation is performed after restoration of power.

[0006]

In order to increase the capacity of the absorption refrigeration cycle, it is necessary to upsize the equipment of the absorption refrigeration cycle, but there is a demand for increasing the capacity without increasing the size. Therefore, the capacity of the absorption refrigeration cycle is increased by increasing the concentration of the absorption liquid and increasing the concentration difference between the high concentration absorption liquid and the low concentration absorption liquid.

By increasing the concentration of the absorbing solution in this way, the crystallization temperature of the absorbing solution rises. Therefore, in the same short-time dilution operation as in the conventional case, sufficient dilution may not be possible, and crystallization may occur depending on the conditions. Therefore, it can be considered to carefully prevent the crystallization by carefully performing the dilution operation after the power is restored. However, for example, if a power failure occurs during cooling operation, there is a request to start the cooling operation immediately after the power failure is restored, so if you carefully perform the dilution operation after power restoration, you cannot start cooling for a while after power restoration, It is not easy to use. Further, when the diluting operation is carefully performed after the power is restored, the diluting operation may be unnecessarily performed, resulting in unnecessary power consumption. Of course, even during the heating operation, the same problem as in the cooling operation occurs.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to carry out a dilution operation according to an operating state before a power failure after power is restored, thereby eliminating wasteful dilution.
Moreover, it is to provide an absorption air conditioner that can be restarted in the shortest possible time.

[0009]

The absorption type air conditioner of the present invention employs the following technical means in order to achieve the above object. [Means for Claim 1] The absorption type air conditioner has a heating means for heating the absorbing liquid, a regenerator for vaporizing a part of the absorbing liquid by heating the absorbing liquid by the heating means, and a regenerator. A condenser that cools and condenses the vaporized refrigerant, an evaporator that evaporates the liquefied refrigerant liquefied by this condenser under low pressure,
An absorption type refrigeration cycle equipped with an absorber that absorbs the vaporized refrigerant evaporated in this evaporator into an absorption liquid, a solution pump that pumps the absorption liquid in this absorber to the regenerator, the heating means and the absorption type refrigeration Power source monitoring means for monitoring the power supply state of the commercial power source for operating the cycle, operating state storage means for storing the operating state of the absorption refrigeration cycle when the commercial power source fails, and restoration of the power supply of the commercial power source. At times, when the operating state stored in the operating state storage means is heating operation, there is provided dilution operating means for performing a dilution operation according to the temperature of the regenerator.

[Means for Claim 2] The absorption type air conditioner comprises a heating means for heating the absorbing liquid, a regenerator for heating a portion of the absorbing liquid by the heating means, and a regenerator. A condenser that cools and condenses the vaporized refrigerant generated in 1., an evaporator that evaporates the liquefied refrigerant liquefied in this condenser under low pressure, an absorber that absorbs the vaporized refrigerant evaporated in this evaporator into an absorption liquid, this absorption An absorption type refrigeration cycle including a solution pump that pressure-feeds the absorption liquid in the container to the regenerator; a power supply monitoring unit that monitors a power supply state of a commercial power supply that operates the heating unit and the absorption refrigeration cycle; When the commercial power source fails, the operating state storage unit that stores the operating state of the absorption refrigeration cycle and the operating state stored in the operating state storage unit when the commercial power supply is restored For operation, and a dilution operation means for performing a dilution operation according to the temperature of the regenerator.

[Means for Claim 3] In the absorption type air conditioner according to Claim 2, when the operating state stored in the operating state storage means is the cooling operation at the time of returning the power supply of the commercial power source, the dilution operation is performed. When the temperature of the regenerator is equal to or higher than a predetermined temperature, the means estimates a power failure time based on a temperature difference between the temperature of the regenerator stored in the operating state storage means and the temperature of the regenerator at the time of power restoration. However, if it is assumed that this estimated time is long, if the temperature of the regenerator at the time of power restoration is lower than a predetermined temperature, and if the outside air temperature is equal to or higher than a predetermined temperature, the indoor unit fan is stopped. It is characterized in that the pseudo cooling operation for performing the cooling operation is temporarily performed and the dilution operation is performed.

[Means for Claim 4] The absorption type air conditioner comprises a heating means for heating the absorbing liquid, a regenerator for heating a portion of the absorbing liquid by the heating means, and a regenerator. A condenser that cools and condenses the vaporized refrigerant generated in 1., an evaporator that evaporates the liquefied refrigerant liquefied in this condenser under low pressure, an absorber that absorbs the vaporized refrigerant evaporated in this evaporator into an absorption liquid, this absorption An absorption type refrigeration cycle including a solution pump that pressure-feeds the absorption liquid in the container to the regenerator; a power supply monitoring unit that monitors a power supply state of a commercial power supply that operates the heating unit and the absorption refrigeration cycle; When the commercial power source fails, the operating state storage unit that stores the operating state of the absorption refrigeration cycle and the operating state stored in the operating state storage unit when the commercial power supply is restored For stopping the processing or during stop processing operation, and a dilution operation means for performing a dilution operation according to the temperature of the regenerator.

[0013]

[Operation and effect of the invention] [Operation and effect of claim 1] According to the means of claim 1, when the power is restored from the power failure, the operating state stored in the operating state storage means is the temperature of the regenerator when the heating operation is performed. Perform the appropriate dilution operation. As a result, since the dilution operation suitable for the heating operation state at the time of power failure can be executed at the time of power restoration, useless dilution operation can be suppressed and crystallization can be prevented.

[Operation and Effect of Claim 2] According to the means of claim 2, when the operating state stored in the operating state storage means is the cooling operation at the time of power recovery from the power failure, the dilution operation according to the temperature of the regenerator is performed. I do. As a result, since the dilution operation suitable for the cooling operation state at the time of power failure can be executed at the time of power restoration, useless dilution operation can be suppressed and crystallization can be prevented.

[Operation and effect of claim 3] By adopting the means of claim 3, when the power is restored from the power failure, the operation state stored in the operation state storage means is the cooling operation, and the temperature of the regenerator at the time of the power failure occurs. Is high, the power outage time is long, and the temperature of the regenerator at the time of power restoration is low, the pseudo cooling operation is performed when the outside air temperature is such that the cooling operation can be performed. As a result, the absorption liquid in the absorption refrigeration cycle can be efficiently circulated, and as a result, the dilution time can be shortened.

[Operation and effect of claim 4] According to the means of claim 4, when the operation state stored in the operation state storage means is during the cooling operation stop processing or the stop processing at the time of power recovery from a power failure, Perform the dilution operation according to the temperature of the regenerator.
As a result, when power is restored, the dilution operation suitable for the processing state at the time of power failure can be executed, so that useless dilution operation can be suppressed and crystallization can be prevented.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described based on examples and modifications. [First Embodiment] FIGS. 1 and 2 are drawings for explaining an embodiment, FIG. 1 is a schematic view of an outdoor unit in an absorption air conditioner, and FIG. 2 is a connection diagram of an outdoor unit and an indoor unit. .

(Schematic Description of Absorption Air Conditioner) The absorption air conditioner comprises an outdoor unit 1 and an indoor unit 2, and the outdoor unit 1 is composed of a refrigerator main body 3 and a cooling tower 4 and an indoor unit 2 Each of the electric functional parts except the one is controlled by the controller 5.
The refrigerator main body 3 is mainly made of stainless steel and forms an absorption cycle by using an aqueous solution of lithium bromide as a refrigerant and an absorbing liquid, and has a heating means 6 for heating the absorbing liquid and a double-effect absorption type. And a refrigeration cycle 7.

(Explanation of Heating Means 6) The heating means 6 of this embodiment uses a gas combustion device that combusts a gas which is a fuel to generate heat and heats the absorbing liquid by the generated heat. The heating means 6 is a gas burner 1 that burns gas.
1, a gas supply means 12 for supplying gas to the gas burner 11, a combustion fan 13 for supplying combustion air to the gas burner 11, and the like. The gas supply means 12 is
Gas pipe 12a, gas source solenoid valve 12b for opening and closing this gas pipe 12a, gas proportional valve 12 for adjusting the amount of gas fuel
It is composed of c. Then, the heat obtained by the gas combustion of the gas burner 11 heats the boiling device 14 of the absorption refrigeration cycle 7 so as to heat the low-concentration absorbing liquid (hereinafter, dilute liquid) supplied into the boiling device 14. It is provided.

(Explanation of Absorption Refrigeration Cycle 7) The absorption refrigeration cycle 7 is equipped with a boiling device 14 which is heated by the heating means 6, and the rare liquid supplied to the boiling device 14 is heated to dilute it. Utilizing the high temperature regenerator 15 that vaporizes (evaporates) the refrigerant (water) contained in the liquid into a medium-concentration absorption liquid (hereinafter, medium liquid) and the condensation heat of the vaporized refrigerant in the high temperature regenerator 15, The low temperature regenerator 16 that heats the medium liquid supplied from the high temperature regenerator 15 side by utilizing the pressure difference and vaporizes the refrigerant contained in the medium liquid to turn the medium liquid into a highly concentrated absorbing liquid (hereinafter, concentrated liquid) 16. And 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 a vacuum, and an absorption for absorbing the vaporized refrigerant evaporated by the evaporator 18 into a concentrated liquid obtained by the low temperature regenerator 16. And a container 19.

(Description of High Temperature Regenerator 15) High Temperature Regenerator 15
Is the above-mentioned boiling device 1 for heating the dilute liquid by the heating means 6.
4, and a boiling cylinder 21 extending upward from the boiling device 14
Equipped with. The vaporized refrigerant that has boiled in the boiling device 14 and the boiling tube 21 and is vaporized from the dilute liquid is blown out from the boiling tube 21 into the high temperature regeneration case 22 having a cylindrical container shape. The high temperature vaporized refrigerant blown into the high temperature regeneration case 22 is deprived of heat by the wall of the high temperature regeneration case 22 as vaporization heat at the time of evaporation of the middle liquid in the low temperature regenerator 16 to be cooled to be a liquefied refrigerant (water). )become.

Inside the boiling cylinder 21 of this embodiment, there is arranged a container 21a for storing the medium liquid after the refrigerant is blown into the boiling cylinder 21 and the refrigerant is vaporized. It is supplied to the low temperature regenerator 16 through the liquid pipe 23. The middle liquid pipe 23 is provided with a throttle means (not shown) such as an orifice. When the cooling / heating switching valve 52a, which will be described later, is closed, this throttling means causes the medium liquid to flow while maintaining the pressure difference between the high temperature regenerator 15 and the low temperature regenerator 16, and when the cooling / heating switching valve 52a is opened, the medium liquid is discharged. It is provided so that it hardly flows. The liquefied refrigerant (water) liquefied in the high temperature regeneration case 22 and separated outside the boiling cylinder 21
Passes through the liquid refrigerant pipe 25 connected to the lower part of the condenser 17
Be led to.

(Description of Low Temperature Regenerator 16) Low Temperature Regenerator 16
Is provided with a low temperature regeneration case 31 in the shape of a tubular container that covers the high temperature regeneration case 22. This low temperature regenerator 16 is a medium liquid pipe 2
The medium liquid supplied through the No. 3 is injected toward the ceiling portion of the high temperature regeneration case 22. Since the temperature in the low temperature regeneration case 31 is lower than the temperature in the high temperature regeneration case 22,
The pressure in the low temperature regeneration case 31 is lower than the pressure in the high temperature regeneration case 22. Therefore, the medium liquid supplied from the medium liquid pipe 23 into the low temperature regeneration case 31 is easily evaporated. Then, when the middle liquid is poured into the ceiling portion of the high temperature regeneration case 22, the middle liquid is heated by the wall of the high temperature regeneration case 22,
Part of the refrigerant contained in the medium liquid evaporates and becomes a vaporized refrigerant,
The rest becomes thick liquid.

Here, the upper side of the low temperature regeneration case 31 communicates with the upper side of the annular case-shaped condensing case 32 via a communication portion 33. Therefore, the vaporized refrigerant evaporated in the low temperature regeneration case 31 passes through the communicating portion 33 and is condensed in the condensing case 3
2 is supplied. On the other hand, the concentrated liquid is the low temperature regeneration case 31.
And is supplied to the absorber 19 through the concentrated liquid pipe 34 connected to the lower portion of the low temperature regeneration case 31. In addition,
A ceiling plate 35 is provided on the upper side in the low temperature regeneration case 31, and a gap 36 through which vaporized refrigerant passes is provided between the outer peripheral end of the ceiling plate 35 and the low temperature regeneration case 31.

(Description of Condenser 17) The condenser 17 is covered with a condensing case 32 in the shape of an annular container. Inside the condensing case 32, a condensing heat exchanger 37 that cools and liquefies the vaporized refrigerant in the condensing case 32 is arranged. This condensing heat exchanger 37 is an annular coil,
Cooling water flows inside. Then, the liquefied refrigerant supplied from the low temperature regenerator 16 into the condensing case 32 is cooled and liquefied by the condensing heat exchanger 37. The liquefied refrigerant is received by the tray 37a, and the tray 37a receives the liquefied refrigerant.
Is guided to the evaporator 18 via the first liquid refrigerant supply pipe 38a.

On the other hand, below the condensing case 32, the refrigerant is supplied from the above-mentioned high temperature regenerator 15 through the liquid refrigerant pipe 25. When supplied to the condensing case 32, the supplied refrigerant reboils due to the difference in pressure (a low pressure of about 70 mmHg in the condensing case 32) and is supplied in a state where the vaporized refrigerant and the liquefied refrigerant are mixed. . The liquefied refrigerant stored in the lower portion of the condensing case 32 is passed through the second liquid refrigerant supply pipe 38c provided with the refrigerant valve 38b, which is an electromagnetic opening / closing valve, and then the evaporator 18 is supplied.
Be led to.

(Description of Evaporator 18) The evaporator 18 is provided below the condensing case 32 together with the absorber 19, and is an annular container-shaped evaporation / absorption case provided around the low temperature regeneration case 31. It is covered by 41. An evaporation heat exchanger 42 that evaporates the liquefied refrigerant supplied from the condenser 17 is arranged outside the evaporation / absorption case 41. This evaporation heat exchanger 42
Is an annular coil through which cold / hot water (water used as a heating / cooling heat medium) supplied to the indoor unit 2 flows.
Then, from the condenser 17 to the first and second liquid refrigerant supply pipes 38
The liquefied refrigerant supplied via a and 38c is supplied to the refrigerant spraying tool 43 via a refrigerant boiling device 43a arranged above the evaporation heat exchanger 42, and the refrigerant spraying tool 43 evaporates heat exchange. It is sprinkled on the container 42.

Since the inside of the evaporation / absorption case 41 is maintained in a substantially vacuum (for example, 6.5 mmHg), the boiling point is low, and the liquefied refrigerant dispersed in the evaporation heat exchanger 42 is very likely to evaporate. Then, the liquefied refrigerant sprayed on the evaporation heat exchanger 42 removes heat of vaporization from the cold and warm water flowing in the evaporation heat exchanger 42 to evaporate. As a result, the cold / hot water flowing through the evaporation heat exchanger 42 is cooled. Then, the cooled cold / hot water is guided to the indoor unit 2 to cool the room.

(Description of Absorber 19) The absorber 19 is covered with the evaporation / absorption case 41 as described above. And
The absorber 19 is provided inside the evaporation / absorption case 41,
An absorption heat exchanger 44 for cooling the concentrated liquid supplied from the concentrated liquid pipe 34 is arranged. This absorption heat exchanger 44 is
Cooling water that cools the concentrated liquid sprinkled on the coil flows inside the annular coil. In addition, the absorption heat exchanger 44
The cooling water that has passed through the condenser 17 is condensed by the heat exchanger 37 for condensation of the condenser 17.
After passing through, it is guided to the cooling tower 4 and cooled. The cooling water cooled in the cooling tower 4 is again absorbed by the heat exchanger 4 for absorption.
Guided to 4.

On the other hand, above the absorption heat exchanger 44, there is arranged an absorbent dispersion device 45 for distributing the concentrated liquid supplied from the concentrated liquid pipe 34 to the absorption heat exchanger 44. The concentrated liquid sprinkled on the absorption heat exchanger 44 travels along the coil surface of the absorption heat exchanger 44 and falls from the upper side to the lower side, while removing the vaporized refrigerant generated by evaporation in the evaporation heat exchanger 42. Absorb. As a result, the absorbing liquid that has dropped to the bottom of the evaporation / absorption case 41 becomes a dilute liquid having a low concentration.

Inside the evaporation / absorption case 41, a cylindrical partition wall 46 is arranged between the evaporation heat exchanger 42 and the absorption heat exchanger 44. The cylindrical partition wall 46 communicates with the inside of the evaporation / absorption case 41 at the upper side, and the vaporized refrigerant generated in the evaporator 18 is connected to the cylindrical partition wall 46.
Is guided into the absorber 19 via the upper part of the.

A dilute liquid pipe 47 for supplying the dilute liquid at the bottom of the evaporation / absorption case 41 to the evaporator 14 is connected to the bottom of the evaporation / absorption case 41. The rare liquid pipe 47 is provided with a solution pump 48 for flowing the rare liquid from the inside of the evaporation / absorption case 41 in a substantially vacuum state toward the boiling device 14.

(Explanation of Other Components in Absorption Refrigeration Cycle 7) The 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 dilute liquid flowing from the absorber 19 to the boiling device 14.
and a low temperature heat exchanger 51b for exchanging heat between the concentrated liquid flowing from the low temperature regenerator 16 to the absorber 19 and the dilute liquid flowing from the absorber 19 to the boiling device 14 are integrated. The high temperature heat exchanger 51a cools the medium liquid flowing from the boiling cylinder 21 to the low temperature regenerator 16 and conversely heats the dilute liquid flowing from the absorber 19 to the boiling device 14. Further, the low temperature heat exchanger 51b cools the concentrated liquid flowing from the low temperature regenerator 16 to the absorber 19, and conversely heats the dilute liquid flowing from the absorber 19 to the boiling device 14.

Further, the absorption refrigeration cycle 7 of this embodiment is provided with heating operation means for performing heating operation in addition to the cooling operation by the above-described operation. The heating operation means evaporates and absorbs the high temperature absorbing liquid from the lower portion of the boiling cylinder 21.
It is composed of a heating pipe 52 that leads to the lower part of the absorption case 41, and a cooling / heating switching valve 52a that opens and closes the heating pipe 52.
This heating / cooling switching valve 52a is opened during heating operation to guide the high temperature absorbing liquid into the evaporation / absorption case 41, and the evaporator 18
The cold and warm water flowing in the heat exchanger 42 for evaporation is heated.

(Explanation of Indoor Unit 2) The indoor unit 2 includes an evaporator 1
The hot and cold water that has flowed in the heat exchanger 42 for evaporation of 8 and is cooled or heated is forcibly exchanged with the room air to cool or heat the room. An indoor heat exchanger (not shown) for exchanging and an indoor fan (not shown) are provided. A terminal control circuit (not shown) is incorporated inside the indoor unit 2 to control the rotation speed of the indoor fan according to the difference between the indoor temperature and the set temperature, and to open the flow rate adjusting valve 60 described later. Degree control. Further, the terminal control circuit is connected to the controller 5 of the outdoor unit 1 via the signal line 2a and outputs a driving instruction or the like to the outdoor unit 1.

In the indoor heat exchanger of the indoor unit 2, cold / hot water that has flowed in the evaporation heat exchanger 42 and is cooled or heated is introduced to the indoor heat exchanger, and the heat exchanged by the indoor heat exchanger is conducted. A cold / hot water pipe 53 is connected to return the cold / hot water after replacement to the evaporation heat exchanger 42 again. This hot and cold water piping 53
Is provided with a cold / hot water pump 54 for circulating cold / hot water.

The hot and cold water pipe 53 has a heat exchanger 42 for evaporation.
Flow control valve 60 for adjusting the flow rate of cold and hot water flowing through
Is provided. When a plurality of indoor units 2 are provided, the flow rate adjusting valve 60 is provided for each indoor unit 2 so as to individually adjust the flow rate of the cold / hot water supplied to each indoor unit 2.

(Explanation of Cooling Tower 4) The cooling tower 4 includes the absorber 1
9 and the condenser 17, the temperature of the cooling water is raised from the upper side to the lower side, while exchanging heat with the outside air to dissipate heat while flowing, and at the same time to partially evaporate heat of vaporization. The cooling tower fan 61 is provided to take the cooling water and cool the cooling water, and to promote evaporation and cooling of the cooling water. This cooling tower 4
Is connected to a cooling water pipe 62 (corresponding to a circulation path) for circulating cooling water, and the cooling water in the cooling water pipe 62 is circulated by a cooling water pump 63.

(Explanation of Noncondensable Gas Collecting Means) On the other hand, inside the outdoor unit 1, noncondensable gas such as hydrogen generated by corrosion in the absorption refrigeration cycle 7 is collected outside the absorption refrigeration cycle 7. A non-condensable gas collecting means for storing is stored. This non-condensable gas collecting means is a bleeding means 70 for extracting the non-condensing gas of the absorption refrigeration cycle 7 to the outside,
A non-condensable gas tank 71 for storing the non-condensable gas extracted to the outside by the extraction means 70 is provided.

(Operation of Cooling Operation by Operation of Absorption Refrigeration Cycle 7) In the absorption refrigeration cycle 7, the heating means 6 heats the boiling device 14, whereby the high temperature regenerator 15 extracts vaporized refrigerant from the dilute liquid. And low temperature regenerator 1
At 6, the concentrated solution is removed from the medium solution. The vaporized refrigerant taken out by the high-temperature regenerator 15 and the low-temperature regenerator 16 is condensed in the condenser 17 and liquefied, and then sprayed on the evaporation heat exchanger 42 of the evaporator 18, and the vaporized refrigerant inside the evaporation heat exchanger 42 is condensed. The heat of vaporization is taken from cold and warm water to evaporate. Therefore, the cold / hot water that has passed through the evaporation heat exchanger 42 and is cooled is supplied to the indoor heat exchanger of the indoor unit 2 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 concentrated liquid taken out by the low-temperature regenerator 16 is scattered on the absorption heat exchanger 44, and the vaporized refrigerant flowing from the evaporator 18 is absorbed in this concentrated liquid. It should be noted that the absorption heat generated when the vaporized refrigerant is absorbed by the concentrated liquid is absorbed by the absorption heat exchanger 44 to prevent the absorption capacity from lowering. The concentrated liquid that has absorbed the vaporized refrigerant in the absorber 19 becomes a dilute liquid, is sucked by the solution pump 48, is returned to the boiling device 14 again, and the above cycle is repeated.

(Explanation of Diluting Operation after Recovery from Power Failure) The controller 5 for controlling the electric functional parts of the absorption type air conditioner includes:
When a power failure occurs during the operation of an absorption air conditioner and then the power is restored from the power failure state, a dilution operation function is performed when the power is restored, which performs a dilution operation according to the operating status of the absorption air conditioner Is installed.

In order to realize this dilution operation function, the controller 5 of the absorption air conditioner is supplied with electric power from a commercial power supply (100 V or 200 V AC power supply supplied from a power company) for operating the absorption air conditioner. A power supply monitoring means for monitoring the status, an operation status storage means (for example, EEP-ROM) for storing the operation status (cycle step) and the temperature of the high temperature regenerator 15 at the time of the power failure, and the power supply monitoring means for the power failure. When the power failure is detected, the microcomputer and the memory of the controller 5 are normally operated until the data (operation status, cycle step, temperature of the high temperature regenerator 15, etc.) at the time of the power failure is stored in the operation status storage means. A backup power supply (for example, a capacitor) for controlling the operation and the operation stored in the operation state storage means when the power is restored from the power failure state. And a dilution operation means for performing a dilution operation according to the state. The temperature of the high temperature regenerator 15 is
It is detected by the temperature sensor 80 attached to the boiling cylinder 21.

The dilution operation means is a control program written in the microcomputer of the controller 5, and when a power failure occurs during the heating operation, the dilution operation is performed according to the temperature of the high temperature regenerator 15 when the power is restored. When a power failure occurs during the cooling operation, the cycle step at the time of the power failure (execution step during the cycle control in the cooling operation) and the dilution operation according to the temperature of the high temperature regenerator 15 are performed.

(Explanation of Operation of Diluting Operation Means When Power Failure Occurs During Heating Operation) When the power is restored from the power failure, the operation state stored in the operation state storage means is the heating operation and is stored in the operation state storage means. When the temperature of the high-temperature regenerator 15 is less than 70 ° C., it can be seen that there was a power failure immediately after the heating operation was started, or a power failure was just before the termination of the heating operation. In that case, the dilution operation of operating the solution pump 48 with the refrigerant valve 38b and the heating / cooling switching valve 52a open is performed for 60 seconds, and then the high temperature regenerator 1 is operated.
Confirm that the temperature of 5 is below 90 ° C. Then, the solution pump 48 is stopped while the refrigerant valve 38b and the cooling / heating switching valve 52a are kept open, the liquid level in the absorption refrigeration cycle 7 is adjusted for 10 seconds, and the dilution operation is stopped.

When the operating state stored in the operating state storage means is the heating operation and the temperature of the high temperature regenerator 15 stored in the operating state storage means is 70 ° C. or more when the power is restored from the power failure, the heating is performed. It can be seen that there was a power outage when the operation was in steady operation, or during a heating operation stop process. In that case, the dilution operation of operating the solution pump 48 with the refrigerant valve 38b and the heating / cooling switching valve 52a open is performed for 180 seconds, and then the temperature of the high temperature regenerator 15 is cooled to 90 ° C. or lower. Make sure that. Then, the solution pump 48 is stopped while the refrigerant valve 38b and the cooling / heating switching valve 52a are kept open, the liquid level in the absorption refrigeration cycle 7 is adjusted for 10 seconds, and the dilution operation is stopped.

(Explanation of Operation of Diluting Operation Means When Power Failure Occurs During Steady Cooling Operation) When the power is restored from the power failure, the cycle steps stored in the operation state storage means are in the steady operation of cooling operation (heating means 6). It is understood that there was a power failure immediately after the start of the cooling operation when the temperature of the high temperature regenerator 15 stored in the operating state storage means is less than 60 ° C.) . In that case, a dilution operation is performed in which the solution pump 48 is operated with the refrigerant valve 38b open. And this dilution operation is 6
When the temperature of the high temperature regenerator 15 is lowered to 90 ° C. or lower for 0 seconds, the dilution operation is performed in which the solution pump 48 is operated with the refrigerant valve 38b and the cooling / heating switching valve 52a open. And this dilution operation is 60
The temperature of the high temperature regenerator 15 is 7 seconds.
When the temperature drops to 5 ° C. or lower, the solution pump 48 is stopped while the refrigerant valve 38b and the cooling / heating switching valve 52a are kept open, the liquid level in the absorption refrigeration cycle 7 is adjusted for 10 seconds, and the dilution operation is performed. Stop.

When the power is restored from the power failure, the high temperature regenerator 1 in which the cycle steps stored in the operating state storage means are in the steady operation of the cooling operation and stored in the operating state storage means
It can be seen that when the temperature of 5 was 60 ° C. or higher, there was a power failure when the cooling operation was in steady operation. In that case, first, the dilution operation is performed for 6 seconds by operating the solution pump 48 at a low speed (for example, 60 Hz operation) with the refrigerant valve 38b open. Next, with the refrigerant valve 38b kept open, the solution pump 48
The rotation speed of is changed to a speed according to the temperature detected by the high temperature regenerator 15.

In this state, the power failure time is assumed. Specifically, in this embodiment, it is determined that the power failure time has passed a predetermined time or longer when the following expression A is satisfied, and it is determined that the power failure time is less than the predetermined time when the above expression A is not satisfied. To do. (Temperature of high temperature regenerator 15 at the time of power failure stored in operating state storage means-temperature of high temperature regenerator 15 at power recovery)> (0.8 × high temperature regenerator at power failure stored in operating state storage means 15 temperature-90) ... A type

If the above equation A is not satisfied, the dilution operation is performed in which the solution pump 48 is operated with the refrigerant valve 38b open. Then, this dilution operation is performed for 60 seconds, and the temperature of the high temperature regenerator 15 is 90 ° C.
If the temperature drops below, the dilution operation is performed in which the solution pump 48 is operated with the refrigerant valve 38b and the cooling / heating switching valve 52a open. When the dilution operation is performed for 60 seconds and the temperature of the high temperature regenerator 15 drops to 75 ° C. or lower, the solution pump 48 is operated with the refrigerant valve 38b and the heating / cooling switching valve 52a kept open. After stopping, the liquid level in the absorption refrigeration cycle 7 is adjusted for 10 seconds, and the dilution operation is stopped.

When the above expression A is satisfied, it depends on whether or not the temperature of the high temperature regenerator 15 is 125 ° C. or higher when the power is restored and the inlet temperature of the absorbing liquid of the high temperature regenerator 15 is 45 ° C. or higher. Select the dilution treatment. When this condition is satisfied, a dilution operation is performed in which the solution pump 48 is operated with the refrigerant valve 38b open. Then, when this dilution operation is performed for 60 seconds and the temperature of the high temperature regenerator 15 drops to 90 ° C. or lower, the solution pump 48 is operated with the refrigerant valve 38b and the heating / cooling switching valve 52a open. Carry out a dilution operation. Then, when this dilution operation is performed for 60 seconds and the temperature of the high temperature regenerator 15 drops to 75 ° C. or lower, the solution pump 48 with the refrigerant valve 38b and the cooling / heating switching valve 52a kept open.
Is stopped, the liquid level in the absorption refrigeration cycle 7 is adjusted for 10 seconds, and the dilution operation is stopped.

When the above expression A is satisfied, the temperature of the high temperature regenerator 15 is 125 ° C. or higher, and the high temperature regenerator 15 is higher.
If the condition that the inlet temperature of the absorbing liquid is 45 ° C. or higher is not satisfied, first, the dilution operation in which the solution pump 48 is operated at a low speed (for example, 60 Hz operation) is performed for 6 seconds with the refrigerant valve 38b open. Next, it is determined whether or not the outside air temperature is equal to or higher than the temperature at which the cooling operation can be performed (for example, 15 ° C.).

When the outside air temperature is lower than 15 ° C., the refrigerant valve 38
A dilution operation is carried out in which the solution pump 48 is operated with b open. Then, when the dilution operation is performed for 60 seconds and the temperature of the high temperature regenerator 15 drops to 90 ° C. or lower, the refrigerant valve 38b and the cooling / heating switching valve 52a.
A diluting operation is performed in which the solution pump 48 is operated with the valve open. When the dilution operation is performed for 60 seconds and the temperature of the high temperature regenerator 15 drops to 75 ° C. or lower, the solution pump 48 is operated with the refrigerant valve 38b and the heating / cooling switching valve 52a kept open. Stop the liquid level adjustment in the absorption type refrigeration cycle 7 for 10 seconds,
Stop the dilution operation.

When the outside air temperature is 15 ° C. or higher, the refrigerant valve 38
A dilution operation is performed in which the solution pump 48 is operated with b and the heating / cooling switching valve 52a open. When the water supply to the cooling tower 4 is completed, the refrigerant valve 38b and the cooling / heating switching valve 52a
The solution pump 48 is stopped for 10 seconds while keeping the open state, and the pressure feeding of the dilute solution is temporarily stopped. Next, the solution pump 48 is operated with the refrigerant valve 38b open, and the gas burner 11 of the heating means is ignited, so that the gas burner 11
At a predetermined fuel amount (for example, 6400 kcal / h) is burned. When the temperature of the high temperature regenerator 15 reaches 80 ° C. or higher, the cooling tower 4 is operated.

The temperature of the high temperature regenerator 15 is 100 ° C.
When the above is reached, the dilution determination for operating the solution pump 48 at a low speed is performed. If this dilution determination is performed for 6 seconds, the pseudo cooling operation (cooling operation in which the indoor unit 2 is not operated) is performed. When the temperature of the high temperature regenerator 15 reaches 135 ° C or higher,
Combustion is stopped, while the cooling tower 4 is operated, the refrigerant valve 38
A dilution operation is performed in which the solution pump 48 is operated with b open. When the temperature of the high temperature regenerator 15 drops to 90 ° C. or lower, the cooling tower 4 also stops, and the dilution operation is performed in which the solution pump 48 is operated at a low speed with the refrigerant valve 38b and the cooling / heating switching valve 52a open. When this dilution operation is performed for 25 seconds, the solution pump 48 is stopped while the refrigerant valve 38b and the cooling / heating switching valve 52a are kept open, and liquid level adjustment in the absorption refrigeration cycle 7 is performed for 10 seconds. Done,
Stop the dilution operation.

(Explanation of the operation of the dilution operation means in case of a power failure during the cooling operation stop processing or the stop operation) When the power is restored from the power failure, the cycle step stored in the operation state storage means is the cooling operation stop processing. Alternatively, when the temperature of the high temperature regenerator 15 stored in the operation state storage means is lower than 60 ° C. in the step of the suspension process, the dilution operation is performed to operate the solution pump 48 with the refrigerant valve 38b open. . Then, when this dilution operation is performed for 60 seconds and the temperature of the high temperature regenerator 15 drops to 90 ° C. or lower, the solution pump 48 is operated with the refrigerant valve 38b and the heating / cooling switching valve 52a open. Carry out a dilution operation. When the dilution operation is performed for 60 seconds and the temperature of the high temperature regenerator 15 drops to 75 ° C. or lower, the solution pump 48 is operated with the refrigerant valve 38b and the heating / cooling switching valve 52a kept open. After stopping, the liquid level in the absorption refrigeration cycle 7 is adjusted for 10 seconds, and the dilution operation is stopped.

When the power is restored from the power failure, the cycle step stored in the operating state storage means is the step during the stop processing or the stop processing of the cooling operation, and the temperature of the high temperature regenerator 15 stored in the operating state storage means. When the temperature is 60 ° C. or higher, the dilution operation in which the solution pump 48 is operated at a low speed (for example, 60 Hz operation) with the refrigerant valve 38b open is performed for 6 seconds. Next, the outside air temperature is a temperature (for example, 1
(5 ° C) or higher is judged.

When the outside air temperature is less than 15 ° C., the refrigerant valve 38
A dilution operation is carried out in which the solution pump 48 is operated with b open. Then, when the dilution operation is performed for 60 seconds and the temperature of the high temperature regenerator 15 drops to 90 ° C. or lower, the refrigerant valve 38b and the cooling / heating switching valve 52a.
A diluting operation is performed in which the solution pump 48 is operated with the valve open. When the dilution operation is performed for 60 seconds and the temperature of the high temperature regenerator 15 drops to 75 ° C. or lower, the solution pump 48 is operated with the refrigerant valve 38b and the heating / cooling switching valve 52a kept open. Stop the liquid level adjustment in the absorption type refrigeration cycle 7 for 10 seconds,
Stop the dilution operation.

When the outside air temperature is 15 ° C. or higher, the refrigerant valve 38
A dilution operation is performed in which the solution pump 48 is operated with b and the heating / cooling switching valve 52a open. When the water supply to the cooling tower 4 is completed, the refrigerant valve 38b and the cooling / heating switching valve 52a
The solution pump 48 is stopped for 10 seconds while keeping the open state, and the pressure feeding of the dilute solution is temporarily stopped. Next, the solution pump 48 is operated with the refrigerant valve 38b open, and the gas burner 11 of the heating means is ignited, so that the gas burner 11
At a predetermined fuel amount (for example, 6400 kcal / h) is burned. When the temperature of the high temperature regenerator 15 reaches 80 ° C. or higher, the cooling tower 4 is operated.

The temperature of the high temperature regenerator 15 is 100 ° C.
When the above is reached, the dilution determination for operating the solution pump 48 at a low speed is performed. If this dilution determination is performed for 6 seconds, the pseudo cooling operation (cooling operation in which the indoor unit 2 is not operated) is performed. When the temperature of the high temperature regenerator 15 reaches 135 ° C or higher,
Combustion is stopped, while the cooling tower 4 is operated, the refrigerant valve 38
A dilution operation is performed in which the solution pump 48 is operated with b open. When the temperature of the high-temperature regenerator 15 drops to 90 ° C. or lower, the cooling tower 4 is also stopped, and the solution pump 48 is operated at a low speed while the refrigerant valve 38b and the cooling / heating switching valve 52a are opened to perform the dilution operation. When this dilution operation is performed for 25 seconds, the solution pump 48 is stopped while the refrigerant valve 38b and the cooling / heating switching valve 52a are kept open, and liquid level adjustment in the absorption refrigeration cycle 7 is performed for 10 seconds. Done,
Stop the dilution operation.

Further, the diluting operation means of this embodiment corresponds to the cycle step stored in the operation state storage means when the power is restored from the power failure when the cycle step is the dilution mode cycle step at the time of restoration of the power. It is provided so that the diluted operation is performed.

[Effects of the Embodiment] As described above, in the absorption air conditioner according to the present embodiment, when the operating state stored in the operating state storage means is the heating operation when the power is restored from the power failure. Since the dilution operation is performed according to the temperature of the high temperature regenerator 15, useless dilution operation can be suppressed and crystallization can be reliably prevented.

When the operating state stored in the operating state storage means is the cooling operation when the power is restored from the power failure, the dilution operation is performed according to the temperature of the high temperature regenerator 15, so that the useless dilution operation is suppressed. In addition, the occurrence of crystallization can be reliably prevented. In addition, when the temperature of the high temperature regenerator 15 at the time of power failure is high, the power failure time is long, and the temperature of the high temperature regenerator 15 at the time of power restoration is low, the pseudo cooling operation is performed in the case of the outside air temperature at which the cooling operation is possible Therefore, the absorption liquid in the absorption refrigeration cycle 7 can be efficiently circulated, and as a result, the dilution time can be shortened.

Further, when the power is restored from the power failure, the dilution operation according to the temperature of the high temperature regenerator 15 is performed even when the operation state stored in the operation state storage means is in the process of stopping or stopping the cooling operation. In addition, wasteful dilution operation can be suppressed, and crystallization can be reliably prevented.

[Modification] In the above embodiment, the open air type cooling tower 4 for evaporating a part of the cooling water to the atmosphere is shown as an example of the cooling water cooling means, but the cooling water flows in the heat exchanger. A closed cooling water cooling means for exchanging heat between the cooling water and the atmosphere may be used. In the above embodiment, the air conditioning indoor unit 2 having a heat exchanger and a fan is shown as an example of the indoor unit 2, but another indoor unit 2 such as floor heating may be connected to the outdoor unit 1. . In the above embodiment, the double refrigeration type is shown as an example of the absorption refrigeration cycle 7, but the single refrigeration type may be used, or the multi-effect type with three or more layers may be used. Further, when the medium liquid is injected into the low temperature regenerator 16, an example of injecting it from above the low temperature regenerator 16 is shown, but it may be injected from below.

As a heating source of the heating means 6, 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.
An example in which the condensing heat exchanger 37, the evaporating heat exchanger 42, and the absorbing heat exchanger 44 are provided in a coil shape is shown, but other types of heat exchangers such as a tube-and-fin or a laminated heat exchanger are shown. May be used. Although an aqueous lithium bromide solution is shown as an example of the absorbing liquid, other absorbing liquids such as ammonia as the refrigerant and an aqueous ammonia solution using water as the absorbing liquid may be used.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an outdoor unit in an absorption air conditioner.

FIG. 2 is a connection diagram of an outdoor unit and an indoor unit.

[Explanation of symbols]

2 Indoor unit 5 controller (equipped with a dilution operation function) 6 heating means 7 absorption refrigeration cycle 15 High temperature regenerator 16 low temperature regenerator 17 condenser 18 Evaporator 19 absorber 48 solution pump

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mikio Shimizu             Rinnai 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi             Within the corporation (72) Inventor Toru Fukuchi             4-1-2 Hirano-cho, Chuo-ku, Osaka City, Osaka             Gas Co., Ltd. F term (reference) 3L093 AA04 BB11 BB29 CC01 DD02                       DD05 EE00 EE24 GG00 GG02                       HH01 HH11 JJ01 KK01 KK03

Claims (4)

[Claims] 1. A heating means for heating an absorbing liquid, a regenerator for vaporizing a part of the absorbing liquid by heating the absorbing liquid by the heating means, and a vaporized refrigerant generated in the regenerator for cooling and condensation. Condenser, evaporator for evaporating the liquefied refrigerant liquefied by this condenser under low pressure, absorber for absorbing the vaporized refrigerant evaporated by this evaporator into absorption liquid, pumping the absorption liquid in this absorber to the regenerator An absorption refrigeration cycle including a solution pump, a power supply monitoring unit that monitors a power supply state of a commercial power supply that operates the heating unit and the absorption refrigeration cycle, and the absorption refrigeration cycle when the commercial power supply fails. When the operating state stored in the operating state storage means is heating operation, the operating state storage means for storing the operating state of the regenerator is stored. An absorption type air conditioner comprising: a dilution operation means for performing the same dilution operation. 2. A heating means for heating the absorbing liquid, a regenerator for vaporizing a part of the absorbing liquid by heating the absorbing liquid by the heating means, and cooling and condensing the vaporized refrigerant generated in the regenerator. Condenser, evaporator for evaporating the liquefied refrigerant liquefied by this condenser under low pressure, absorber for absorbing the vaporized refrigerant evaporated by this evaporator into absorption liquid, pumping the absorption liquid in this absorber to the regenerator An absorption refrigeration cycle including a solution pump, a power supply monitoring unit that monitors a power supply state of a commercial power supply that operates the heating unit and the absorption refrigeration cycle, and the absorption refrigeration cycle when the commercial power supply fails. When the operating state stored in the operating state storage means is the cooling operation when the commercial power supply returns to the power supply state, the operating state storage means stores the operating state of the regenerator. An absorption type air conditioner comprising: a dilution operation means for performing the same dilution operation. 3. The absorption type air conditioner according to claim 2, wherein when the operating state stored in said operating state storing means is a cooling operation when the power supply of the commercial power source is restored, said dilution operating means causes said regenerating When the temperature of the regenerator is equal to or higher than a predetermined temperature, the power failure time is assumed based on the temperature difference between the temperature of the regenerator stored in the operating state storage means and the temperature of the regenerator at the time of power restoration, and this estimated time Is assumed to be long, when the temperature of the regenerator at the time of power restoration is lower than a predetermined temperature, and when the outside air temperature is equal to or higher than the predetermined temperature, the cooling operation is performed with the fan of the indoor unit stopped. An absorption type air conditioner characterized by performing a pseudo cooling operation temporarily and performing a dilution operation. 4. A heating means for heating the absorption liquid, a regenerator for vaporizing a part of the absorption liquid by heating the absorption liquid by the heating means, and cooling and condensing the vaporized refrigerant generated in the regenerator. Condenser, evaporator for evaporating the liquefied refrigerant liquefied by this condenser under low pressure, absorber for absorbing the vaporized refrigerant evaporated by this evaporator into absorption liquid, pumping the absorption liquid in this absorber to the regenerator An absorption refrigeration cycle including a solution pump, a power supply monitoring unit that monitors a power supply state of a commercial power supply that operates the heating unit and the absorption refrigeration cycle, and the absorption refrigeration cycle when the commercial power supply fails. And an operating state storage unit that stores the operating state of the commercial power supply, and the operating state stored in the operating state storage unit is in the process of stopping or stopping the cooling operation when the power supply of the commercial power source is restored. In the case of, an absorption type air conditioner comprising: a dilution operation means for performing a dilution operation according to the temperature of the regenerator.