JP3056987B2 - Absorption cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an absorption cooling device.

[0002]

2. Description of the Related Art A cooling water circuit in which an outdoor heat exchanger, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in a ring shape and circulates cooling water by a cooling water pump, and an indoor heat exchanger and an evaporator heat transfer tube. A chilled water circuit that is circularly connected and circulates chilled water by a chilled water pump, a high-temperature regenerator that vaporizes a refrigerant in the low-concentration absorbent by a heating source and separates the refrigerant into a medium-concentration absorbent and a vapor refrigerant, A low-temperature regenerator that encloses and separates the medium-concentration absorption liquid into a high-concentration absorption liquid and a vapor refrigerant, a condenser in which high-temperature vapor refrigerant is sent from each regenerator while disposing the condenser heat transfer tube, and a refrigerant valve. A refrigerant pipe that is disposed and guides a liquid refrigerant liquefied by the condenser to an evaporator; an evaporator that evaporates the liquid refrigerant under reduced pressure; and an evaporator that is provided with the absorber heat transfer tube that is provided alongside the evaporator. Low-temperature regeneration of vapor refrigerant evaporated in An absorber for absorbing the high-concentration absorbing solution sent from the device, and an absorption cycle having a solution pump for returning the absorbing solution in the absorber to the high-temperature regenerator; and a temperature detecting unit for detecting the temperature of the high-temperature regenerator. 2. Description of the Related Art An absorption cooling apparatus including a controller for controlling the cooling water pump, the chilled water pump, the heating source, the refrigerant valve, and the solution pump has been conventionally known.

[0003]

In the above-mentioned conventional absorption type cooling apparatus, when the temperature of the high-temperature regenerator rises abnormally due to a shortage of cooling water or a failure of the cooling water pump (the temperature detecting means detects abnormal high temperature of the high-temperature regenerator). ), The same dilution operation as “normal stop” described below is performed as “high temperature abnormal stop”. The controller stops the operation of the heating source and the chilled water pump, and continues the operation of the solution pump and the chilled water pump.

As a result of conducting various tests, the inventors have found that the above-mentioned conventional absorption type cooling apparatus has the following problems. In the case of "high temperature abnormal stop", even if the dilution operation as described above is performed, the concentration of the absorbing solution tends to be abnormally high partially, and the absorbing solution having a high concentration may crystallize. . When the absorbing solution is crystallized, the circulation of the absorbing solution is hindered, and re-operation becomes impossible.

[0005] It is an object of the present invention to provide an absorption type cooling device in which the concentration distribution of an absorbing solution which becomes partially high when the high temperature regenerator abnormally rises in temperature is made uniform to prevent crystallization.

[0006]

In order to solve the above problems, the present invention employs the following constitution. (1) An outdoor heat exchanger, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in a ring shape, and a cooling water circuit that circulates cooling water by a cooling water pump, and an indoor heat exchanger and an evaporator heat transfer tube are connected in a ring shape. A chilled water circuit that circulates chilled water by a chilled water pump, a high-temperature regenerator that vaporizes a refrigerant in the low-concentration absorbent by a heating source and separates the refrigerant into a medium-concentration absorbent and a vapor refrigerant, and includes the high-temperature regenerator A low-temperature regenerator that separates the medium-concentration absorbing liquid into a high-concentration absorbing liquid and a vapor refrigerant, the condenser heat transfer tube is provided, and a condenser into which high-temperature vapor refrigerant is sent from each regenerator and a refrigerant valve are provided. A refrigerant pipe for guiding the liquid refrigerant liquefied by the condenser to the evaporator; an evaporator for evaporating the liquid refrigerant under reduced pressure; and an absorber heat transfer tube provided alongside the evaporator and evaporating by the evaporator. From the low-temperature regenerator An absorber for absorbing the high-concentration absorbent to be absorbed, and an absorption cycle having a solution pump for returning the low-concentration absorbent in the absorber to the high-temperature regenerator; and a temperature detection unit for detecting the temperature of the high-temperature regenerator, The cooling water pump, the chilled water pump, the heating source, the refrigerant valve, and a controller that controls the solution pump, and when the temperature detecting means detects abnormal overheating of the high-temperature regenerator, the controller In the absorption cooling apparatus that performs a dilution operation in which the operation of the heating source is stopped and the operation of the solution pump and the cooling water pump is continued, the controller maintains the refrigerant valve open during the dilution operation. I do.

(2) A cooling tower with a cooling tower fan, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in a ring shape, and a cooling water circuit for circulating cooling water by a cooling water pump and a blower fan are provided. A chilled water circuit in which an indoor heat exchanger and an evaporator heat transfer tube are connected in a loop, and chilled water is circulated by a chilled water pump, and a heating source vaporizes the refrigerant in the low-concentration absorbent and separates it into medium-concentration absorbent and vapor refrigerant. A high-temperature regenerator, a low-temperature regenerator containing the high-temperature regenerator and separating the medium-concentration absorbent into a high-concentration absorbent and a vapor refrigerant, and the condenser heat-transfer tubes. A condenser into which the refrigerant is fed, a refrigerant valve, and a refrigerant pipe for guiding the liquid refrigerant liquefied by the condenser to the evaporator; an evaporator for evaporating the liquid refrigerant under reduced pressure; Before installing heat transfer tubes An absorber for absorbing the vapor refrigerant evaporated by the evaporator into the high-concentration absorbent sent from the low-temperature regenerator, and an absorption cycle having a solution pump for returning the low-concentration absorbent in the absorber to the high-temperature regenerator; A temperature detection unit that detects the temperature of the high-temperature regenerator, and a controller that controls the cooling tower fan, the blower fan, the cooling water pump, the chilled water pump, the heating source, the refrigerant valve, and the solution pump. When the temperature detecting means detects abnormal overheating of the high-temperature regenerator, the controller stops the operation of the heating source and the blower fan, and the solution pump, the cooling water pump, and the cooling device. In the absorption cooling device performing the dilution operation in which the operation of the tower fan is continued, the controller keeps the refrigerant valve open during the dilution operation.

(3) A cooling tower provided with a cooling tower fan, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in a ring shape, and a cooling water circuit for circulating cooling water by a cooling water pump and a blower fan are provided. An indoor heat exchanger and an evaporator heat transfer tube are connected in a ring, and a chilled water circuit that circulates chilled water by a chilled water pump part of a tandem pump, and a medium in which the refrigerant in the low-concentration absorbing liquid is vaporized by a heating source. A high-temperature regenerator that separates into a vapor refrigerant, a low-temperature regenerator that includes the high-temperature regenerator and separates the medium-concentration absorbent into a high-concentration absorbent and a vapor refrigerant, A condenser into which a high-temperature vapor refrigerant is sent from a condenser, a refrigerant pipe provided with a refrigerant valve and leading a liquid refrigerant liquefied by the condenser to an evaporator, an evaporator for evaporating the liquid refrigerant under reduced pressure, and an evaporator. Attached to the An absorber for disposing a heat transfer tube and absorbing the vapor refrigerant evaporated by the evaporator into the high-concentration absorbent sent from the low-temperature regenerator, and returning the low-concentration absorbent in the absorber to the high-temperature regenerator An absorption cycle having a solution pump section of a tandem pump, temperature detecting means for detecting the temperature of the high-temperature regenerator, the cooling tower fan, the blowing fan, the cooling water pump, the tandem pump, the heating source, and the And a controller for controlling the refrigerant valve, wherein the temperature detecting means detects abnormal overheating of the high-temperature regenerator,
In the absorption cooling device, the controller stops the operation of the heating source and the blower fan, and performs a dilution operation in which the tandem pump, the cooling water pump, and the cooling tower fan continue to operate. The vessel keeps the refrigerant valve open during the dilution operation.

[0009]

[Action]

[Claim 1] The high-temperature regenerator is heated by a heating source, and the low-concentration absorbent is vaporized by the refrigerant and separated into the medium-concentration absorbent and the vapor refrigerant. The low-temperature regenerator separates the medium-concentration absorbent into a high-concentration absorbent and a vapor refrigerant. The vapor refrigerant is sent from each regenerator to the condenser. The vapor refrigerant is condensed by the cooling water flowing through the condenser heat transfer tube and accumulates in the condenser.

The liquid refrigerant in the condenser is sent to the evaporator through a refrigerant pipe provided with a refrigerant valve, hits an evaporator heat transfer pipe through which cold water flows, evaporates, and cools the cold water passing through the evaporator heat transfer pipe. I do. During the cooling operation, the opening and closing of the refrigerant valve is controlled by the controller. Indoor cooling is performed by the cooled cold water passing through the indoor heat exchanger.

[0011] The vapor refrigerant evaporated in the evaporator is absorbed by the high-concentration absorbing liquid sent from the low-temperature regenerator and accumulates in the absorber. The low concentration absorbent collected in the absorber is returned to the high temperature regenerator by the solution pump. The vapor refrigerant is condensed by the cooling water flowing through the condenser heat transfer tube and accumulates in the condenser.

When the temperature detecting means detects abnormal overheating of the high-temperature regenerator, the controller stops the operation of the heating source, keeps the refrigerant valve open, and continues the operation of the solution pump and the cooling water pump. Perform dilution operation.

[0013] The high-temperature regenerator is heated by a heating source, and the low-concentration absorbent is vaporized by the refrigerant and separated into a medium-concentration absorbent and a vapor refrigerant. The low-temperature regenerator separates the medium-concentration absorbent into a high-concentration absorbent and a vapor refrigerant. The vapor refrigerant is sent from each regenerator to the condenser. The vapor refrigerant is condensed by the cooling water that is cooled by the cooling tower fan and flows through the condenser heat transfer tube, and accumulates in the condenser.

The liquid refrigerant in the condenser is sent to the evaporator through a refrigerant pipe provided with a refrigerant valve, and hits an evaporator heat transfer pipe through which cold water flows, evaporates, and cools the cold water passing through the evaporator heat transfer pipe. I do. During the cooling operation, the opening and closing of the refrigerant valve is controlled by the controller. When the cooled cold water passes through the indoor heat exchanger, it exchanges heat with the air sent by the blower fan to perform indoor cooling.

The vapor refrigerant evaporated in the evaporator is absorbed by the high-concentration absorbing liquid sent from the low-temperature regenerator and accumulates in the absorber. The low concentration absorbent collected in the absorber is returned to the high temperature regenerator by the solution pump.

When the temperature detecting means detects abnormal overheating of the high-temperature regenerator, the controller stops the operation of the heating source and the blower fan, keeps the refrigerant valve open, maintains the solution pump,
Perform dilution operation to continue operation of the cooling water pump and cooling tower fan.

[Claim 3] The high-temperature regenerator is heated by a heating source, and the low-concentration absorbent is vaporized by the refrigerant and separated into a medium-concentration absorbent and a vapor refrigerant. The low-temperature regenerator separates the medium-concentration absorbent into a high-concentration absorbent and a vapor refrigerant. The vapor refrigerant is sent from each regenerator to the condenser. The vapor refrigerant is condensed by the cooling water that is cooled by the cooling tower fan and flows through the condenser heat transfer tube, and accumulates in the condenser.

The liquid refrigerant in the condenser is sent to the evaporator through a refrigerant pipe provided with a refrigerant valve, and hits the evaporator heat transfer pipe through which the cold water flows, evaporates, and cools the cold water passing through the evaporator heat transfer pipe. I do. During the cooling operation, the opening and closing of the refrigerant valve is controlled by the controller. When the cooled cold water passes through the indoor heat exchanger, it exchanges heat with the air sent by the blower fan to perform indoor cooling.

The vapor refrigerant evaporated in the evaporator is absorbed by the high-concentration absorbent sent from the low-temperature regenerator and accumulates in the absorber. The liquid refrigerant accumulated in the absorber is returned to the high temperature regenerator by the solution pump section of the tandem pump.

When the temperature detecting means detects abnormal overheating of the high-temperature regenerator, the controller stops the operation of the heating source and the blower fan, keeps the refrigerant valve open, maintains the tandem pump, the cooling water pump, and the cooling tower. Perform dilution operation to keep the fan running.

[0021]

【The invention's effect】

[Claim 1] When the high temperature regenerator abnormally heats up,
Since the generation of vapor refrigerant is promoted, separation proceeds in the high-temperature regenerator and low-temperature regenerator, and the concentration of the absorption liquid (high-temperature / low-temperature regenerator, absorption liquid in the absorber) partially increases, and the absorption The possibility that the liquid crystallizes increases.

When the temperature detecting means detects abnormal overheating of the high-temperature regenerator, the controller stops the operation of the heating source,
A dilution operation is performed in which the refrigerant valve is kept open and the operation of the solution pump and the cooling water pump is continued. As a result, the liquid refrigerant accumulated in the condenser is immediately sent to the absorber through the condenser and the evaporator, and the low-concentration absorbent in the absorbent is returned to the high-temperature regenerator.

For this reason, the concentration distribution of the absorbing solution (the high-temperature / low-temperature regenerator, the absorbing solution in the absorber) which becomes partially concentrated when the high-temperature regenerator abnormally rises in temperature is quickly averaged, and the absorption is increased. The crystallization of the liquid can be prevented.

During the dilution operation, the operation of the cooling water pump is continued in order to coagulate the vapor refrigerant sent from each absorber to generate a liquid refrigerant.

[Claim 2] When the temperature of the high-temperature regenerator rises abnormally, the generation of vapor refrigerant is promoted, so that the separation proceeds in the high-temperature regenerator and the low-temperature regenerator, and the absorption liquid (high-temperature・ The concentration of the low-temperature regenerator and the absorption liquid in the absorber increases, and the possibility that the absorption liquid crystallizes increases.

When the temperature detecting means detects abnormal overheating of the high-temperature regenerator, the controller stops the operation of the heating source,
Keep the refrigerant valve open and perform dilution operation to continue operation of the solution pump, cooling water pump, and cooling tower fan. As a result, the liquid refrigerant accumulated in the condenser is immediately sent to the absorber through the condenser and the evaporator, and the low-concentration absorbent in the absorbent is returned to the high-temperature regenerator.

For this reason, the concentration distribution of the absorbing liquid (the high-temperature / low-temperature regenerator and the absorbing liquid in the absorber) which becomes partially concentrated when the high-temperature regenerator abnormally rises in temperature is quickly averaged, and the absorption is increased. The crystallization of the liquid can be prevented.

During the dilution operation, the operation of the cooling water pump and the cooling tower fan is continued in order to coagulate the vapor refrigerant sent from each absorber to generate a liquid refrigerant.

[Claim 3] When the temperature of the high-temperature regenerator rises abnormally, the generation of vapor refrigerant is promoted, so that the separation proceeds in the high-temperature regenerator and the low-temperature regenerator, and the absorption liquid (high-temperature・ The concentration of the low-temperature regenerator and the absorption liquid in the absorber increases, and the possibility that the absorption liquid crystallizes increases.

When the temperature detecting means detects abnormal overheating of the high-temperature regenerator, the controller stops the operation of the heating source and the blower fan, keeps the refrigerant valve open, and sets the tandem pump,
Perform dilution operation to keep the cooling water pump and cooling tower fan running. As a result, the liquid refrigerant accumulated in the condenser is immediately sent to the absorber through the condenser and the evaporator, and the low-concentration absorbent in the absorbent is returned to the high-temperature regenerator.

For this reason, the concentration distribution of the absorbing solution (high-temperature / low-temperature regenerator, absorbing solution in the absorber) which becomes partially concentrated when the high-temperature regenerator abnormally rises in temperature is quickly averaged, and the absorption is increased. The crystallization of the liquid can be prevented.

During the dilution operation, the operation of the cooling water pump and the cooling tower fan is continued in order to coagulate the vapor refrigerant sent from each absorber to generate a liquid refrigerant. In addition, the operation of the blower fan is stopped in order to minimize the rise in cold water temperature (to prevent evaporation in the evaporator).

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention (corresponding to claim 3) will be described with reference to FIGS. As shown in the figure,
The absorption type cooling and heating apparatus A includes a cooling water circuit 1 for circulating cooling water 10 during cooling operation, a cooling and heating water circuit 2 for circulating cooling and heating water 20, a high-temperature regenerator 3, a low-temperature regenerator 4, a condenser 5, and an evaporator. 6, an absorption cycle 8 having an absorber 7, a tandem pump 80, and the like, a controller 9, and a temperature sensor 91.

The cooling water circuit 1 includes a cooling tower fan 11 and a cooling tower 12 constituting a water-cooled heat exchanger, and a cooling water tank 13.
, A cooling water pump 14, an absorber heat transfer tube 15, and a condenser heat transfer tube 16 are sequentially connected in a ring shape, and the cooling water pump 14 (1230 liter / h) is operated to circulate the cooling water 10 during cooling operation. Let it. The cooling tower fan 11 is
When the temperature of the cooling water 10 supplied to the absorber heat transfer tube 15 is 3
The controller 9 controls the number of rotations to 1.5 ° C. During the heating operation (see FIG. 4), all the cooling water 10 in the cooling water circuit 1 is drained.

The cold / hot water circuit 2 includes an indoor heat exchanger 21 having a blower fan 211 (a plurality of heat exchangers can be connected in parallel), a cistern 22, and a cold / hot water pump section 801 of a tandem pump 80.
(620 liters / h at maximum capacity), evaporator heat transfer tube 37
Are circularly connected, and the cold / hot water 20 is circulated by the cold / hot water pump section 801. The amount of heat absorbed by the indoor heat exchanger 21 during the cooling operation is 4340 kcal (at the maximum capacity), and the amount of heat released from the indoor heat exchanger 21 during the heating operation is 6200.
kcal (at maximum capacity).

The high-temperature regenerator 3 includes a dome-shaped heating chamber 32 heated by a gas burner 31, a blowing cylinder 321 standing upright, and a refrigerant in a dilute liquid 33 (58% aqueous lithium bromide in this embodiment). (Water) is evaporated and the middle liquid 34 (60
% Lithium bromide aqueous solution) and a vapor refrigerant 35. In addition, in the heating chamber 32,
A temperature sensor 91 for measuring the temperature of the high temperature regenerator 3 (the temperature of the diluted liquid 33 or the temperature of the container) is provided.

The gas burner 31 is of a Bunsen type. Gas is supplied by a gas pipe 314 having gas solenoid valves 311 and 312 and a gas proportional valve 313 connected thereto.
5 supplies combustion air and burns.

During the cooling operation, the controller 9 controls the gas burner 31 so that the input amount is between 1500 and 4800 kcal so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 7 ° C. During the turbo cooling operation, the input amount is set to 6500 kcal.

During the heating operation, the controller 9 controls the input amount between 1500 and 8000 kcal so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 60 ° C.

During the cooling operation, since the cooling / heating switching valve 36 is closed, the intermediate liquid 34 (165 ° C.) is supplied to the intermediate liquid pipe 341 →
The high-temperature heat exchange flow path 342 is sent to the upper part of the low-temperature regenerator 4 via the middle liquid pipe 344 having the orifice 343.

The low-temperature regenerator 4 includes the high-temperature regenerator 3,
During the cooling operation, the middle liquid 3 sent from the high temperature regenerator 3
4 is separated into a concentrated liquid 41 (62% aqueous solution of lithium bromide) and a vapor refrigerant 42. During the heating operation, the middle liquid 34 is not sent to the low-temperature regenerator 4.

The condenser 5 has an orifice 5 during heating operation.
The high-temperature vapor refrigerant 35 is sent from the high-temperature regenerator 3 through the vapor refrigerant pipe 51 provided with 11, but does not condense because the cooling water 10 does not flow in the condenser heat transfer tube 16.

During the cooling operation, steam refrigerants 35 and 42 are sent from the high temperature regenerator 3 and the low temperature regenerator 4 to the condenser 5,
The vapor refrigerants 35 and 42 are cooled and liquefied by the cooling water 10 flowing through the coil-shaped condenser heat transfer tubes 16, and the liquid refrigerant (water) 52 accumulates at the bottom of the condenser 5. In addition, temperature rise (3
The cooling water 10 (at 7.5 ° C.) is cooled (3
1.5 ° C).

The evaporator 6 is provided with a coil-shaped (with a spiral groove) evaporator heat transfer tube 37. Since the cooling / heating switching valve 36 is opened during the heating operation, the medium liquid pipe 341 (cooling / heating switching valve 36) → the high temperature medium liquid 3 via the heating pipe 361.
4 is sent to the evaporator 6. At the same time, high-temperature vapor refrigerant 42 is supplied from the condenser 5 to the refrigerant pipe 53 (the refrigerant valve 5).
Sent through 4).

When the refrigerant valve 54 is opened during the cooling operation, the liquid refrigerant 52 is sprayed to the evaporator heat transfer pipe 37 via the refrigerant pipe 53 → the refrigerant valve 54 → the sprayer 55, and the inside of the evaporator 6 is substantially vacuum ( Since the pressure is about 6.5 mmHg, the liquid refrigerant 52 evaporates from the cold / hot water 20 flowing through the evaporator heat transfer tube 37 by evaporating heat. Then, the cooled cold / hot water 20 exchanges heat with the air blown into the room (at maximum capacity, heat absorption 4340 kcal / h) in the indoor heat exchanger 21 placed in the room to raise the temperature. 20 is again cooled by passing through the evaporator heat transfer tube 37.

The absorber 7 provided with the absorber heat transfer tube 15 is
The upper part is connected to the evaporator 6. Then, during the cooling operation, the vapor refrigerant 61 evaporated by the evaporator 6 enters the absorber 7 from above or the like, and the low-temperature regenerator 4 → the concentrated liquid pipe 411 → the low-temperature heat exchange channel 412 → the concentrated liquid pipe 413 → dispersed. The diluted liquid 33 which has been absorbed by the concentrated liquid 41 scattered on the absorber heat transfer tube 15 via the vessel 70 and has become a low concentration accumulates at the bottom of the absorber 7. During the heating operation, a high-temperature absorbing liquid is sent from the evaporator 6.

The tandem pump 80 is a three-phase DC brushless motor (rated output 200
W, power consumption 250 W).
And a solution pump section 802. The tandem pump 80 is provided with a Hall element 800 and a controller 9.
Is feedback-controlled. Since the flow rate control of the cold / hot water 20 may be broad, no problem occurs even if the cold / hot water pump section 801 and the solution pump section 802 are driven by one motor.

The diluted liquid 33 (absorbed liquid during the heating operation) collected at the bottom of the absorber 7 is diluted with a diluted liquid pipe 71 → a solution pump section 80.
2 (maximum flow rate 100 liter / h) → dilute liquid pipe 72 → low temperature heat exchange path 73 → high temperature heat exchange path 74 → dilute liquid pipe 75
Through the heating chamber 32 of the high-temperature regenerator 3.

The temperature sensor 91 is for detecting the temperature of the heating chamber 32 of the high temperature regenerator 3 (the temperature of the diluted liquid 33). The controller 9 controls the following based on a signal from an operation switch (not shown), signals from various sensors including the temperature sensor 91, and the like. Gas solenoid valves 311, 31
2. Gas proportional valve 313, tandem pump 80, cooling tower fan 11, refrigerant valve 54, cooling / heating switching valve 36, cooling water pump 14, blower fan 211.

Next, the operation of the microcomputer of the controller 9 when the absorption-type cooling and heating apparatus A during the cooling operation performs the "high temperature abnormal stop" will be described with reference to the flowchart shown in FIG. In step s1, it is determined whether or not the evaporator temperature is 1 ° C. or less, and if it is 1 ° C. or less (Y
ES) proceeds to step s3, and if it exceeds 1 ° C. (N
O) proceeds to step s2.

In step s2, it is determined whether or not the evaporator temperature is 3 ° C. or higher. If it is 3 ° C. or higher (YES), the process proceeds to step s4. If it is lower than 3 ° C. (NO), the process returns to step s1. . In step s3, the refrigerant valve 54 is opened, and the process proceeds to step s5. In step s4, the refrigerant valve 54 is closed, and the process proceeds to step s5.

In step s5, it is determined whether or not a high temperature abnormality has occurred (the temperature sensor 91 detects a temperature of 175 ° C. or higher). If it has occurred (YES), the process proceeds to step s6, and if not, it has not occurred (NO). ) Returns to step s1 to continue the cooling operation.

At step s6, the gas solenoid valves 311, 31
2 is closed to extinguish the gas burner 31, and the process proceeds to step s7. In step s7, the refrigerant valve 54 is kept open, and the process proceeds to step s8. In step s8, the following dilution operation is performed for about 9 minutes.

[Dilution Operation] The operation of the blower fan 211 is stopped, and the operations of the combustion fan 315, the tandem pump 80, the cooling water pump 14, and the cooling tower fan 11 are continued. As a result, the liquid refrigerant 52 accumulated in the condenser 5 is quickly sent to the absorber 7 via the evaporator 6, and
Is returned to the high temperature regenerator 3, and the absorbing liquid in the high temperature regenerator 3 is diluted. Further, the diluted absorbing liquid in the high-temperature regenerator 3 is supplied to the intermediate liquid pipe 341 → the high-temperature heat exchange channel 342 →
The liquid is sent to the low-temperature regenerator 4 through the middle liquid pipe 344 with the orifice 343, and the absorbent in the low-temperature regenerator 4 is diluted.

The reason why the operation of the cooling water pump 14 and the cooling tower fan 11 is continued during the dilution operation is to cool the liquid. The reason why the operation of the combustion fan 315 is continued during the dilution operation is to cool the gas burner 31. Further, the reason why the operation of the blower fan 211 is stopped during the dilution operation is to suppress the temperature rise of the cold / hot water 20 as much as possible (prevent the evaporation in the evaporator 6).

At step s9, the temperature of the high-temperature regenerator 3 ≦ 1
It is determined whether or not the temperature is 10 ° C. (the temperature sensor 91 detects a temperature of 110 ° C. or less).
Proceeds to step s10, and if it exceeds 110 ° C., returns to step s8 to continue the dilution operation.

In step s10, the refrigerant valve 54 is closed,
The operation of the combustion fan 315, the tandem pump 80, the cooling water pump 14, and the cooling tower fan 11 is stopped, and the dilution operation is terminated (abnormal high temperature stop).

The absorption type air conditioner A of this embodiment has the following advantages. When the temperature of the high-temperature regenerator 3 rises abnormally, the generation of the vapor refrigerants 35 and 42 is promoted.
The separation proceeds in the low-temperature regenerator 4 and partially absorbs (absorbent in the high-temperature regenerator 3, the low-temperature regenerator 4, and the absorber 7).
And the likelihood of crystallization of the absorbing solution increases.

However, in the absorption type air conditioner A, when the temperature sensor 91 detects 175 ° C. or more and the “high temperature abnormal stop” is performed, the controller 9 closes the gas solenoid valves 311 and 312 (the gas burner 31 is turned off). (Fire extinguishing), the operation of the blower fan 211 is stopped, the refrigerant valve 54 is kept open, and the tandem pump 8
0, a configuration for performing a dilution operation for continuing the operation of the cooling water pump 14 and the cooling tower fan 11 is adopted.

As a result, the liquid refrigerant 52 stored in the condenser 16 is immediately sent to the absorber 7 via the evaporator 6, and the dilute liquid 33 in the absorbent 7 is returned to the high temperature regenerator 3, The absorption liquid in the high-temperature regenerator 3 is diluted. The diluted absorption liquid in the high-temperature regenerator 3 is supplied to the middle liquid pipe 341 → the high-temperature heat exchange channel 342 → the middle liquid pipe 3 having the orifice 343.
It is sent to the low-temperature regenerator 4 via 44, and the absorbing solution in the low-temperature regenerator 4 is diluted.

For this reason, the concentration distribution of the absorbing solution (the absorbing solution in the high-temperature regenerator 3, the low-temperature regenerator 4, and the absorber 7) which becomes partially high when the high-temperature regenerator 3 abnormally rises in temperature rapidly. And the crystallization of the absorbing solution can be prevented. In addition, if the cause of the abnormal temperature rise is identified and eliminated, the re-operation (cooling operation) can be performed without any trouble.

The present invention includes the following embodiments in addition to the above embodiment. a. Instead of using the tandem pump 80, the cold / hot water pump and the solution pump may be constituted by separate pumps.
2). In this case, the cold / hot water pump is stopped during the dilution operation. b. The absorption cooling and heating device A may be configured to perform only the cooling operation. c. The heating source may be an electric heater or the like.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of an absorption-type cooling and heating apparatus according to an embodiment of the present invention.

FIG. 2 is a system diagram of the absorption type cooling and heating device.

FIG. 3 is an operation explanatory diagram when the absorption type cooling and heating apparatus is operated for cooling.

FIG. 4 is an operation explanatory diagram when the absorption type cooling / heating device is operated for heating.

FIG. 5 is a flowchart showing the operation of the controller when the absorption-type cooling / heating device performs “high temperature abnormal stop”.

[Explanation of symbols]

 A Absorption cooling / heating device (absorption cooling device) 1 Cooling water circuit 2 Cooling / heating water circuit (Cooling water circuit) 3 High temperature regenerator 4 Low temperature regenerator 5 Condenser 6 Evaporator 7 Absorber 8 Absorption cycle 9 Controller 11 Cooling tower fan 12 Cooling Tower (Outdoor Heat Exchanger) 14 Cooling Water Pump 15 Absorber Heat Transfer Tube 16 Condenser Heat Transfer Tube 21 Indoor Heat Exchanger 31 Gas Burner (Heating Source) 32 Heating Unit 33 Rare Liquid (Low Concentration Absorbent) 34 Medium Liquid ( Medium-concentration absorbing liquid 35 Vapor refrigerant 37 Evaporator heat transfer tube 41 Concentrated liquid (high-concentration absorbing liquid) 42 Vapor refrigerant (high-temperature refrigerant) 52 Liquid refrigerant 53 Refrigerant pipe 54 Refrigerant valve 61 Vapor refrigerant 80 Tandem pump 91 Temperature sensor (Temperature detection Means) 211 Blow fan 801 Cold / hot water pump (cold / hot water pump) 802 Solution pump (solution pump)

Continued on the front page (72) Inventor Satoshi Naito One of 916 Kuramatsucho, Hamamatsu City, Shizuoka Prefecture Inside Hamatech Co., Ltd. (72) Inventor Kaoru Kawamoto 4-1-2 Hiranocho, Chuo-ku, Osaka-shi Osaka Gas Co., Ltd. (72) Inventor Shinsuke Takahashi 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (56) References JP-A-7-190538 (JP, A) JP-A-3-134442 (JP) JP-A-6-229645 (JP, A) JP-A-2-213659 (JP, A) JP-A-6-347119 (JP, A) JP-A-2-28051 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 15/00 306

Claims (3)

(57) [Claims] 1. A cooling water circuit in which an outdoor heat exchanger, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in a ring shape, and a cooling water pump circulates cooling water; and an indoor heat exchanger and an evaporator heat transfer tube. A chilled water circuit that is annularly connected and circulates chilled water by a chilled water pump; a high-temperature regenerator that vaporizes a refrigerant in the low-concentration absorbent by a heating source and separates the refrigerant into a medium-concentration absorbent and a vapor refrigerant; A low-temperature regenerator that encloses and separates the medium-concentration absorption liquid into a high-concentration absorption liquid and a vapor refrigerant, a condenser in which high-temperature vapor refrigerant is sent from each regenerator while disposing the condenser heat transfer tube, and a refrigerant valve. A refrigerant pipe that is disposed and guides a liquid refrigerant liquefied by the condenser to an evaporator; an evaporator that evaporates the liquid refrigerant under reduced pressure; and an evaporator that is provided with the absorber heat transfer tube that is provided alongside the evaporator. Low-temperature regeneration of vapor refrigerant evaporated in An absorption cycle having an absorber for absorbing the high-concentration absorbent sent from the apparatus and a solution pump for returning the low-concentration absorbent in the absorber to the high-temperature regenerator; and a temperature detecting means for detecting the temperature of the high-temperature regenerator And a controller for controlling the cooling water pump, the chilled water pump, the heating source, the refrigerant valve, and the solution pump, and the control is performed when the temperature detecting unit detects abnormal overheating of the high temperature regenerator. The absorption type cooling device performs a dilution operation while stopping the operation of the heating source and continuing the operation of the solution pump and the cooling water pump, wherein the controller opens the refrigerant valve during the dilution operation. Absorption cooling system characterized by maintaining a valve. 2. A cooling water circuit in which a cooling tower provided with a cooling tower fan, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in a ring shape to circulate cooling water by a cooling water pump, and a room provided with a blower fan. A chilled water circuit in which heat exchangers and evaporator heat transfer tubes are connected in a ring, and chilled water is circulated by a chilled water pump, and a heating source vaporizes the refrigerant in the low-concentration absorbent and separates it into medium-concentration absorbent and vapor refrigerant. A high-temperature regenerator, a low-temperature regenerator that contains the high-temperature regenerator and separates the medium-concentration absorbent into a high-concentration absorbent and a vapor refrigerant, and the condenser heat-transfer tube is provided. A refrigerant pipe, which is provided with a refrigerant valve and a refrigerant valve for introducing a liquid refrigerant liquefied by the condenser to an evaporator, an evaporator for evaporating the liquid refrigerant under reduced pressure, and an absorber provided along with the evaporator. Heat transfer tubes are installed and the steam An absorber for absorbing the vapor refrigerant evaporated in the absorber into the high-concentration absorbent sent from the low-temperature regenerator, and an absorption cycle having a solution pump for returning the low-concentration absorbent in the absorber to the high-temperature regenerator; Temperature detecting means for detecting the temperature of the high-temperature regenerator, and a controller for controlling the cooling tower fan, the blower fan, the cooling water pump, the cold water pump, the heating source, the refrigerant valve, and the solution pump. When the temperature detecting means detects abnormal overheating of the high-temperature regenerator, the controller stops the operation of the heating source and the blower fan, and the solution pump, the cooling water pump, and the cooling tower. An absorption-type cooling device that performs a dilution operation in which the operation of a fan is continued, wherein the controller keeps the refrigerant valve open during the dilution operation. 3. A cooling water circuit in which a cooling tower provided with a cooling tower fan, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in a ring shape to circulate cooling water by a cooling water pump, and a room provided with a blower fan. A chilled water circuit in which heat exchangers and evaporator heat transfer tubes are connected in a ring, and chilled water is circulated by a chilled water pump part of a tandem pump, and a medium in the low-concentration absorbent is vaporized by vaporizing the refrigerant in the low-concentration absorbent by a heating source A high-temperature regenerator that separates the refrigerant into a refrigerant, a low-temperature regenerator that includes the high-temperature regenerator and separates the medium-concentration absorbing liquid into a high-concentration absorbing liquid and a vapor refrigerant, A condenser pipe into which high-temperature vapor refrigerant is fed, a refrigerant pipe provided with a refrigerant valve and a liquid refrigerant liquefied by the condenser to an evaporator, an evaporator for evaporating the liquid refrigerant under reduced pressure, and an evaporator. Attached to the absorber An absorber for disposing a heat pipe and absorbing the vapor refrigerant evaporated by the evaporator into the high-concentration absorbent sent from the low-temperature regenerator; and a tandem pump for returning the low-concentration absorbent in the absorber to the high-temperature regenerator An absorption cycle having a solution pump section, a temperature detecting means for detecting a temperature of the high-temperature regenerator, the cooling tower fan, the blower fan, the cooling water pump, the tandem pump, the heating source, and the refrigerant valve. When the temperature detecting means detects abnormal overheating of the high-temperature regenerator, the controller stops the operation of the heating source and the blower fan, and performs the operation of the tandem pump and the cooling device. In an absorption type cooling apparatus that performs a diluting operation for continuing the operation of the water pump and the cooling tower fan, the controller may maintain the refrigerant valve open during the diluting operation. Absorption type cooling apparatus according to symptoms.