JP3281564B2 - Absorption air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner capable of performing at least a cooling operation by using an absorption refrigeration cycle, and more particularly, to a cooling system in which an absorber absorbs absorbed heat and a condenser cools a vaporized refrigerant. As the temperature of the water increases, the temperature of the cooling water supplied to the absorber and the condenser increases,
The present invention relates to an absorption type air conditioner provided with determination means for determining a cooling water high temperature abnormality that causes an abnormality in an absorption refrigeration cycle.

[0002]

2. Description of the Related Art An absorption refrigeration cycle includes a heating means for heating an absorption liquid, a regenerator for evaporating a part of the heated absorption liquid, a condenser for cooling and liquefying a vaporized refrigerant generated in the regenerator. An evaporator that evaporates the liquefied refrigerant liquefied by the condenser under a low pressure, an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorbent, and a solution pump that pumps the absorbent in the absorber to a regenerator. The cooling water is used as a means for absorbing the heat of absorption generated in the absorber, and the cooling water is used as a means for cooling the vaporized refrigerant in the condenser.

[0003] Cooling water whose temperature has risen after passing through an absorber or a condenser is guided to cooling means such as a cooling tower.
Cooled by outdoor air (hereinafter referred to as outside air), the cooled cooling water is guided again to the absorber and the condenser. Here, such as during the cooling operation in summer, when the outside air temperature is high and the temperature of the cooling water is not sufficiently cooled even after passing through the cooling means, or some trouble occurs in the cooling means (for example, the fan for sending outside air is stopped). And the like, the temperature of the cooling water may not be sufficiently cooled even after passing through the cooling means.

[0004] As described above, when the temperature of the cooling water sent to the absorber or the condenser rises, the ability of the absorber to remove heat of absorption,
In addition, not only does the capacity of the condenser cool the vaporized refrigerant, but also the internal pressure of the absorber and the condenser increases due to the decrease in the cooling capacity. When the internal pressure of the absorber or the condenser increases, the internal pressure of the regenerator increases several to several tens of times. As a result, the pressure difference between the absorber and the regenerator becomes very large, causing the solution pump to malfunction. In addition, when the internal pressure of the regenerator increases due to the increase of the internal pressure of the absorber or the condenser, the temperature of the strongly corrosive absorbing liquid also becomes high, and the corrosion of the regenerator rapidly progresses.

In order to avoid such a problem, conventionally, the temperature of cooling water sent to an absorber or a condenser is detected by a cooling water temperature sensor, and the temperature of the cooling water detected by the cooling water temperature sensor is set to a predetermined temperature. At this time (at a temperature set slightly lower than the temperature at which the solution pump malfunctions, for example, at least 38 ° C.), it is determined that a cooling water high temperature abnormality has occurred, and heating of the absorbent by the heating means is stopped. Was.

[0006]

However, as described above, when the cooling water high temperature abnormality is determined based on the temperature of the cooling water detected by the cooling water temperature sensor, the cooling operation may be restarted immediately after the cooling operation is stopped. When the cooling load in the room is small and the room temperature is lowered and the cooling operation is temporarily stopped and then restarted, the cooling means for cooling the cooling water is not insufficiently cooled, but the mounting portion of the cooling water temperature sensor is installed. The temperature detected by the cooling water temperature sensor depends on the influence of the heat from the outside air, the heat transmitted from the absorbing liquid in the absorption refrigeration cycle, and the residual reaction heat after the cooling water pump stopped during the previous operation stop. May rise above a predetermined temperature.

As described above, even if the temperature detected by the cooling water temperature sensor has risen to a predetermined temperature or higher, as long as the cooling water is not insufficiently cooled, the cooling operation is temporarily stopped immediately after restarting the cooling operation. If only the ability to take away the heat of absorption in the absorber and the ability to cool the vaporized refrigerant in the condenser are reduced, then if cooling water below a certain temperature is sent to the absorber or condenser, the solution pump will malfunction. There is no problem that causes an abnormality in the absorption refrigeration cycle, such as occurrence of corrosion and rapid progress of corrosion, and normal cooling operation is performed. However, even in such a case, in the related art, when the detected temperature of the cooling water temperature sensor is equal to or higher than a predetermined temperature, it is determined that the cooling water high temperature is abnormal. As a result, there was a problem that the cooling operation was not restarted.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an absorption type refrigeration cycle that does not cause an abnormality in the absorption type refrigeration cycle even if the temperature of the cooling water rises. To provide an absorption type air conditioner that does not stop the cooling operation.

[0009]

Means for Solving the Problems The absorption type air conditioner of the present invention employs the following technical means to achieve the above object. (Means of Claim 1) The absorption type air conditioner includes: a) heating means for heating the absorption liquid; b) a regenerator for evaporating a part of the absorption liquid heated by the heating means; A condenser that cools and liquefies the vaporized refrigerant, an evaporator that evaporates the liquefied refrigerant liquefied by the condenser under a low pressure, an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorbing liquid, An absorption refrigeration cycle including a solution pump for pumping an absorption liquid to the regenerator; c) a cooling water circuit for removing heat of absorption in the absorber and circulating cooling water for cooling the vaporized refrigerant in the condenser. D) cooling means provided in the cooling water circuit for cooling the cooling water by outdoor air; and e) a temperature of the cooling water supplied to the absorber and the condenser increases, and the absorption refrigeration cycle increases. Water causing abnormalities And a control means comprising determining means for performing determination whether the temperature abnormality occurs.

The control means includes an absorbent temperature sensor for detecting the temperature of the absorbent in the regenerator and a coolant temperature sensor for detecting the temperature of the coolant supplied to the absorber and the condenser. The judging means is configured to detect the occurrence of a high temperature abnormality of the cooling water when the temperature of the absorbing liquid detected by the absorbing liquid temperature sensor is equal to or higher than a predetermined temperature and the temperature of the cooling water detected by the cooling water temperature sensor is equal to or higher than the predetermined temperature. The control means stops the operation of heating the absorbing liquid by the heating means when the determination means determines that the cooling water high temperature abnormality has occurred.

[0011]

[0012]

[0013]

In the cooling operation using the absorption refrigeration cycle, if the temperature of the absorbent in the regenerator detected by the absorbent temperature sensor does not satisfy the predetermined temperature or more, the cooling immediately after the stop is performed. Judging that the restart operation is early, even if the temperature of the cooling water supplied to the absorber or the condenser is high, the judging means does not judge that the cooling water high temperature abnormality has occurred,
The control means operates the heating means to operate the absorption refrigeration cycle.

When the refrigeration cycle is activated, the temperature of the cooling water is increased immediately after the start of the operation. Therefore, the ability to remove heat of absorption in the absorber and the ability to cool the vaporized refrigerant in the condenser are reduced. When the temperature of the absorbing liquid inside is lower than the predetermined temperature, the internal pressure of the regenerator is low, and the pressure difference with the absorber is small. Therefore, the absorption refrigeration cycle does not cause any abnormality such as malfunction of the solution pump or drastic corrosion.

As described above, conventionally, when the operation is stopped (for example, when the cooling is restarted immediately after the cooling operation is stopped, or when the indoor cooling load is small and the indoor temperature decreases, If the cooling operation is restarted after the cooling operation is stopped, the cooling water temperature sensor is affected by the heat of the outside air, the heat transmitted from the absorption refrigeration cycle, and the cooling water at the previous operation stop. Even if the temperature detected by the cooling water temperature sensor rises to a predetermined temperature or higher due to the effect of the residual reaction heat after the pump stops), the absorption refrigeration cycle operates and performs the cooling operation. As a result, the operating range of the air conditioner is expanded and the usability is improved.

[0016]

Next, embodiments of the present invention will be described based on examples and modifications. [Structure of Embodiment] This embodiment will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram of an absorption type air conditioner that performs indoor air conditioning, and FIG. 2 is a flowchart showing a part of control included in a control device.

A schematic configuration of the absorption type air conditioner 1 will be described.
In this example, a double effect type was used as an example of the absorption refrigeration cycle 2. The absorption type air conditioner 1 to which the present embodiment is applied is roughly divided into a double type using a combustion device 3 (corresponding to a heating means of the present invention) for heating an absorbing liquid (a lithium bromide aqueous solution in this embodiment). An absorption type refrigeration cycle 2 of a utility type, and indoor air conditioning means 4 for air conditioning the room with cold and hot water (a heat medium for cooling and heating the room, water in this embodiment) cooled or heated by the absorption type refrigeration cycle 2; Cooling water cooling means 5 for cooling cooling water used for cooling and liquefying a vaporized refrigerant (steam in this embodiment) in the absorption refrigeration cycle 2, and controls each mounted electric functional component. And a control device 6 (corresponding to control means of the present invention).

(Description of Absorption Refrigeration Cycle 2) The combustion apparatus 3 of this embodiment uses a gas combustion apparatus that generates heat by burning gas as a fuel and heats the absorbing liquid by the generated heat. A gas burner 11 for burning gas, and a gas supply means 1 for supplying gas to the gas burner 11
2. It comprises a combustion fan 13 for supplying air for combustion to the gas burner 11, and the like. Then, the heat obtained by the gas combustion of the gas burner 11 heats the boiler 14 of the absorption refrigeration cycle 2 to heat the low-concentration absorption liquid (hereinafter, low liquid) supplied into the boiler 14. Is provided.

The absorption refrigeration cycle 2 includes the above-mentioned boiler 14, and the low liquid supplied into the boiler 14 is heated to vaporize (evaporate) the refrigerant (water) contained in the low liquid. ) By using a high-temperature regenerator 15 to be converted into a medium-concentration absorbing liquid (hereinafter referred to as “medium liquid”), and a pressure difference from the high-temperature regenerator 15 using the heat of condensation of the vaporized refrigerant in the high-temperature regenerator 15. The low-temperature regenerator 16 that heats the supplied middle liquid and vaporizes the refrigerant contained in the middle liquid to turn the middle liquid into a high-concentration absorbing liquid (hereinafter, high liquid), and the high-temperature regenerator 15 and the low-temperature regenerator 16 Condenser 17 that cools and liquefies the vaporized refrigerant (steam)
And an evaporator 18 for evaporating the liquefied refrigerant (water) liquefied in the condenser 17 under a pressure close to vacuum, and an evaporator 18
And an absorber 19 for absorbing the vaporized refrigerant evaporated in the high-temperature liquid obtained by the low-temperature regenerator 16.

(Explanation of the high temperature regenerator 15)
The boiler 14 is disposed in the combustion device 3, and the high-temperature regenerator includes, in addition to the boiler 14, a boiling cylinder 21 extending upward from the boiler 14. The vaporized refrigerant that has been boiled in the boiler 14 and the boiling cylinder 21 and vaporized from the low liquid is blown out from the boiling cylinder 21 into the cylindrical high-temperature regeneration container 22. The high-temperature vaporized refrigerant blown into the high-temperature regeneration container 22 passes through the wall of the high-temperature regeneration container 22 and passes through the low-temperature regeneration device 16.
Heat is taken away as heat of vaporization when the middle liquid in the liquid evaporates, and is cooled to become a liquefied refrigerant (water).

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

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

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

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

(Explanation of the Condenser 17) The condenser 17 is covered by an annular container-shaped condensing container 32. The condensing container 32 is provided so as to cover the periphery of the upper side of the low-temperature regenerating container 31. Inside the condensing container 32, a condensing heat exchanger 37 for cooling and liquefying the vaporized refrigerant in the condensing container 32 is arranged. ing. The condensing heat exchanger 37 is an annular coil through which cooling water flows. And the low-temperature regenerator 16
The vaporized refrigerant supplied into the condensing container 32 is cooled and liquefied by the condensing heat exchanger 37, and drops below the condensing heat exchanger 37.

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

(Explanation of the evaporator 18) The evaporator 18 is provided together with the absorber 19 so as to cover the lower part of the condensing container 32, that is, the lower periphery of the low-temperature regenerating container 31. Evaporation absorption container 41 with annular shape around the periphery
Covered in. An evaporation heat exchanger 42 for evaporating the liquefied refrigerant supplied from the condenser 17 is disposed outside the inside of the evaporation absorption container 41. The evaporating heat exchanger 42 is an annular coil through which cold and hot water (heat medium) supplied to the indoor air conditioner 4 flows. The liquefied refrigerant supplied from the condenser 17 via the liquid refrigerant supply pipe 38 is arranged above the evaporating heat exchanger 42,
It is sprayed onto the evaporating heat exchanger 42 from an annular refrigerant spraying tool 43 having a large number of spraying tubes.

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

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

On the other hand, on the upper part of the absorption heat exchanger 44, there is arranged an annular absorbent dispersion device 45 for dispersing the high liquid supplied from the high liquid pipe 34 onto the absorption heat exchanger 44. The high liquid sprayed on the absorption heat exchanger 44 is supplied to the absorption heat exchanger 4.
While falling along the coil surface of No. 4 from the upper side to the lower side, the evaporating refrigerant generated by evaporation in the evaporating heat exchanger 42 is absorbed. As a result, the absorption liquid that has fallen to the bottom of the evaporative absorption container 41 becomes a low concentration liquid with a low concentration.

Inside the evaporative absorption container 41, a cylindrical partition wall 4 is provided between the evaporating heat exchanger 42 and the absorbing heat exchanger 44.
6 are arranged. This cylindrical partition wall 46 is used for the evaporator 1.
In order to guide the vaporized refrigerant generated in 8 into the absorber 19,
For example, the upper part is provided with an opening so as to communicate the evaporator 18 and the absorber 19.

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

(Description of other components in absorption refrigeration cycle 2) Reference numeral 51 shown in FIG.
A high-temperature heat exchanger 51 for exchanging heat between the medium liquid flowing from inside to the low-temperature regenerator 16 and the low liquid flowing from the absorber 19 to the boiler 14.
a, and a low-temperature heat exchanger 51b for exchanging heat between the high liquid flowing from the low-temperature regenerator 16 to the absorber 19 and the low liquid flowing from the absorber 19 to the boiler 14. The high-temperature heat exchanger 51a cools the middle liquid flowing from the boiling cylinder 21 to the low-temperature regenerator 16 and heats the low liquid flowing from the absorber 19 to the boiler 14. The low-temperature heat exchanger 51b cools the high liquid flowing from the low-temperature regenerator 16 to the absorber 19 and heats the low liquid flowing from the absorber 19 to the boiler 14.

The absorption refrigeration cycle 2 of this embodiment is provided with heating operation means for performing a heating operation in addition to the cooling operation by the above-described operation. The heating operation means includes a heating pipe 52 for guiding the high-temperature absorbing liquid from the lower part of the boiling cylinder 21 to a lower part of the evaporator 18, and a cooling / heating switching valve 53 for opening and closing the heating pipe 52. The cooling / heating switching valve 53 opens during the heating operation to guide the high-temperature absorbing liquid into the evaporating / absorbing container 41 and heat the cold / hot water flowing in the evaporating heat exchanger 42 of the evaporator 18.

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

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

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

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

(Description of Cooling Water Cooling Means 5) The cooling water cooling means 5 includes an evaporating cooling tower 61, a cooling water circuit 62 for circulating cooling water, and a cooling water for circulating cooling water in the cooling water circuit 62. A pump 63 is provided. The cooling tower 61 allows the cooling water that has passed through the absorber 19 and the condenser 17 to flow downward from above, exchange heat with the outside air while flowing, and release heat, and partially evaporate while flowing. In this case, heat of vaporization is taken from the cooling water flowing at the time of evaporation to cool the flowing cooling water. The cooling tower 61 includes a cooling water fan 64 that generates an air flow and promotes evaporation and cooling of the cooling water.

The cooling water circuit 62 passes through the absorber 19 and the condenser 17, and supplies the cooling water whose temperature has risen to the cooling tower 61.
The cooling water cooled by the cooling tower 61 is sent to the absorber 19 and the condenser 17 again. In the cooling water circuit 62, the cooling water is supplied to the cooling tower 61 and the cooling water pump 63. Is provided with a cooling water tank 65 for storing the cooling water.

The cooling water tank 65 is installed below the cooling tower 61 and below the cistern 58,
The cooling water passing through 1 is supplied, and the water overflowing in the cistern 58 is supplied. The cooling water tank 65 is provided with a water level sensor (not shown). When the level of the cooling water in the cooling water tank 65 decreases, the water supply valve 60 is opened to overflow the water from the cistern 58, and the overflowed water is supplied to the overflow water supply means. 59
The cooling water is supplied to the inside of the cooling water tank 65 from a.

(Explanation of the control device 6) The control device 6 includes the above-described refrigerant valve 39, solution pump 48 (cold and hot water pump 57),
Electrical functional components such as the indoor fan 55, the cooling / heating switching valve 53, the water supply valve 60, the cooling water pump 63, the cooling water fan 64, and the electrical functional components of the combustion device 3 (combustion fan 1)
3. Gas control valve 66, gas on-off valve 67, ignition device 68
) Is controlled in accordance with an operation instruction of a controller (not shown) manually set by a user or an input signal of each of a plurality of sensors.

The control device 6 operates during the cooling operation.
Judgment means 6a for judging whether or not the temperature of the cooling water supplied to the absorber 19 and the condenser 17 has risen and a cooling water high temperature abnormality that causes an abnormality in the absorption refrigeration cycle 2 has occurred.
The control device 6 controls the operation of the combustion device 3 and the like based on the determination result of the determination means 6a. In order to perform this control, the control device 6 is provided with an absorbent temperature sensor 71 for detecting the temperature of the absorbent in the high temperature regenerator 15. This is performed under the condition that the temperature of the absorbing liquid detected by the sensor 71 is equal to or higher than a predetermined temperature (for example, 165 ° C.).

More specifically, the control unit 6 controls the cooling system supplied to the absorber 19 and the condenser 17 in addition to the absorbing solution temperature sensor 71 for detecting the temperature of the absorbing solution of the high temperature regenerator 15. Cooling water temperature sensor 7 for detecting water temperature
2 and a judgment means 6a provided in the control device 6.
Indicates that the temperature of the absorbing liquid detected by the absorbing liquid temperature sensor 71 is equal to or higher than a predetermined temperature (for example, 165 ° C.) and the temperature of the cooling water detected by the cooling water temperature sensor 72 is the predetermined temperature (for example,
38 [deg.] C.) or more, it is provided to determine the occurrence of a cooling water high temperature abnormality.

The control device 6 is provided so as to stop the combustion device 3 and stop the heating operation of the absorbing liquid when the judging means 6a judges the occurrence of the abnormal high temperature of the cooling water. In this embodiment, an example is shown in which the combustion device 3 is stopped when the judging means 6a judges the occurrence of the abnormal high temperature of the cooling water. However, the heating amount is reduced by, for example, minimizing the combustion amount of the combustion device 3. The temperature of the absorbing solution detected by the absorbing solution temperature sensor 71 is set to the predetermined temperature (for example, 165).
When the temperature rises to a higher temperature (e.g., 170 [deg.] C.) or higher, the combustion device 3 may be stopped.

The control performed by the judging means 6a of the control device 6 for judging the abnormal high temperature of the cooling water will be described with reference to the flowchart of FIG. When the cooling operation is instructed by the controller (start), it is determined whether or not the temperature of the absorbent detected by the absorbent temperature sensor 71 is equal to or higher than a predetermined temperature (for example, 165 ° C.) (step S1). If the result of this determination is NO, the operation proceeds to the cooling operation control in step S2. In this cooling operation control, based on the signal data of various sensors, the combustion device 3 is operated to operate the absorption refrigeration cycle 2, and the indoor air conditioning means 4 and the cooling water cooling means 5 are operated to perform the cooling operation. The operation will be described later.

When the temperature of the absorbent detected by the absorbent temperature sensor 71 is equal to or higher than a predetermined temperature (for example, 165 ° C.), the cooling water whose temperature has increased in this state is supplied to the absorber 19 and the condenser 17. Abnormality in absorption refrigeration cycle 2 (pressure difference with absorber 19 becomes very large due to increase in internal pressure of high-temperature regenerator 15, causing malfunction of solution pump 48 or corrosive due to increase in internal pressure of high-temperature regenerator 15. The temperature of the absorbing liquid also becomes high, and corrosion progresses dramatically). Therefore, if the determination result of step S1 is YES, it is determined whether the temperature of the cooling water detected by the cooling water temperature sensor 72 is equal to or higher than a predetermined temperature (for example, 38 ° C.) (step S3). If the determination result is NO, it is determined that there is no possibility that an abnormality will occur in the absorption refrigeration cycle 2 even if the cooling operation is continued in this state, and the process proceeds to the refrigeration operation control in step S2.

However, if the result of the determination in step S3 is YES, the cooling operation is continued and the solution pump 4
It is determined that there is a high possibility that the absorption refrigeration cycle 2 will cause an abnormality such as malfunction of the suction refrigeration cycle 8 or rapid progress of the corrosion in the absorption refrigeration cycle 2, and the cooling operation is stopped (step S4). Specifically, similarly to the case where the operation stop instruction is given by the controller, the operation of the combustion device 3 is stopped, and the solution pump 48 is turned on until the temperature of the absorbent in the high-temperature regenerator 15 drops below a predetermined temperature. Perform the dilution operation to operate. Further, the fact that the operation has been stopped due to the cooling water high temperature abnormality is displayed on a display means provided in the controller or the like (error mode display).

(Explanation of the operation of the cooling operation) Next, the operation of the cooling operation by the cooling operation control will be described. When the cooling operation is instructed by the controller and the judging means 6a does not judge the cooling water high temperature abnormality, the operation of each of the electric functional parts causes
The combustion device 3 and the absorption refrigeration cycle 2 operate. In the absorption refrigeration cycle 2, when the combustion device 3 heats the boiler 14, the high-temperature regenerator 15 takes out the vaporized refrigerant from the low liquid and the low-temperature regenerator 16 takes out the high liquid from the middle liquid. .

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

The vaporized refrigerant evaporated in the evaporator 18 passes above the cylindrical partition wall 46 and flows into the absorber 19.
On the other hand, in the absorber 19, the high liquid taken out by the low-temperature regenerator 16 is absorbed by the absorbing heat exchanger 44 through the absorbing liquid spraying tool 45.
The vaporized refrigerant flowing from the evaporator 18 is absorbed by the high liquid. Note that the absorption heat generated when the vaporized refrigerant is absorbed by the high liquid is absorbed by the absorption heat exchanger 44, thereby preventing the absorption capacity from lowering. The high liquid that has absorbed the vaporized refrigerant in the absorber 19 becomes a low liquid, is sucked in by the solution pump 48, and is returned to the evaporator 14 again.
Repeat the above cycle.

(Explanation of the Heating Operation) When the heating operation is instructed by the controller, the combustion device 3 is operated, the solution pump 48 (cooling / heating water pump 57), the indoor fan 55 are turned on, and the cooling / heating switching valve 53 is turned on. be opened. When the combustion device 3 heats the evaporator 14, the high-temperature absorbing liquid heated by the evaporator 14 is supplied to the evaporator 1 through the heating pipe 52.
8, the cold and hot water flowing in the evaporating heat exchanger 42 of the evaporator 18 is heated. For this reason, the cold and hot water heated by passing through the evaporating heat exchanger 42 is supplied to the indoor heat exchanger 54 of the indoor air-conditioning means 4 to heat the room.

[Effects of Embodiment] As described above, in the related art, even when the operation is stopped (when the temperature detected by the cooling water temperature sensor 72 is equal to or higher than a predetermined temperature),
When the temperature of the absorbing liquid in the high-temperature regenerator 15 detected by the absorbing liquid temperature sensor 71 is lower than a predetermined temperature (for example, 165 ° C.), the cooling operation is performed. Usability is improved.

More specifically, for example, when the cooling is restarted immediately after the cooling operation is stopped, or when the cooling load in the room is small and the room temperature decreases, the cooling operation is temporarily stopped and then restarted. In this case, the cooling water temperature sensor 72 is affected by the heat of the outside air, by the heat transmitted from the absorption refrigeration cycle 2, and by the residual reaction heat after the cooling water pump was stopped during the previous operation stop. As a result, the temperature detected by the cooling water temperature sensor 72 becomes a predetermined temperature (for example, 38 ° C.).
Even in the above case, if the temperature of the absorbent in the high-temperature regenerator 15 detected by the absorbent temperature sensor 71 is lower than a predetermined temperature (for example, 165 ° C.), the cooling operation is performed. In other words, conventionally, even in a state where the cooling operation is not performed,
Since the cooling operation is performed, the usability is improved.

[Modification] In the above embodiment, the double-effect absorption refrigeration cycle 2 has been described as an example of the absorption refrigeration cycle. However, a single-effect absorption refrigeration cycle may be used. A triple effect or more multi-effect absorption refrigeration cycle may be used. In addition, when the middle liquid is injected into the low-temperature regenerator 16, an example is shown in which the medium is injected from above the low-temperature regenerator 16.
It may be injected from below.

As the heating means, the gas combustion device 3 for burning gas is used.
Another heating device may be used, or another heating device such as a heating device for heating the absorbing liquid by exhaust heat of the internal combustion engine or a heating device using an electric heater may be used. Although the example in which the heat exchanger for condensation 37, the heat exchanger for evaporation 42, and the heat exchanger for absorption 44 are provided in a coil shape has been described, other types of heat exchangers such as a tube and fin or a stacked heat exchanger are used. May be used.

Although an aqueous solution of lithium bromide has been described as an example of the absorbing solution, other absorbing solutions such as an aqueous ammonia solution using ammonia as a refrigerant and water as an absorbent may be used. As an example of the heat medium, tap water is used and shared with the cooling water in the cooling water circuit. However, other heat medium such as antifreeze or oil different from the cooling water in the cooling water circuit may be used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an absorption type air conditioner.

FIG. 2 is a flowchart showing the operation of a judging means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Absorption air conditioner 2 Absorption refrigeration cycle 3 Combustion device (heating means) 5 Cooling water cooling means 6 Control device (control means) 6a Judging means 15 High temperature regenerator 16 Low temperature regenerator 17 Condenser 18 Evaporator 19 Absorber 48 Solution pump 62 Cooling water circuit 71 Absorbent temperature sensor 72 Cooling water temperature sensor

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-75865 (JP, A) JP-A-7-19651 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 15/00 306

Claims (1)

(57) [Claims] A) a heating means for heating the absorbing liquid; b) a regenerator for vaporizing a part of the absorbing liquid heated by the heating means; and a vaporized refrigerant generated in the regenerator is cooled and liquefied. A condenser, an evaporator that evaporates the liquefied refrigerant liquefied by the condenser under low pressure, an absorber that absorbs the vaporized refrigerant evaporated by the evaporator into an absorbent, and pumps the absorbent in the absorber to the regenerator. An absorption refrigeration cycle including a solution pump that performs a cooling operation; c) a cooling water circuit that circulates cooling water that cools vaporized refrigerant with the condenser while absorbing heat absorbed by the absorber; Cooling means for cooling the cooling water with outdoor air, e) a cooling water high temperature abnormality which causes an abnormality in the absorption refrigeration cycle when the temperature of the cooling water supplied to the absorber and the condenser increases. Whether or not Judge who makes judgment
Control means comprising a step , wherein the control means comprises: an absorbent temperature sensor for detecting the temperature of the absorbent in the regenerator ; and the absorber and the condenser.
Cooling water temperature sensor that detects the temperature of cooling water supplied to the
The absorption means detects the absorption liquid detected by the absorption liquid temperature sensor.
The temperature of the liquid is equal to or higher than a predetermined temperature, and the cooling water temperature sensor
When the temperature of the cooling water detected by the
The occurrence of a high temperature abnormality is determined, and the control unit determines that the determination unit has generated
When the heating operation of the absorbing liquid by the heating means is determined,
An absorption type air conditioner characterized by being stopped .