JPH10170091A - Absorbing type water cooling or heating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe and small-sized absorbing type water cooling or water heating machine in which a liquid surface of a high temperature regenerator is detected by mans having no movable section and an appropriate solution circulating amount control can be carried out. SOLUTION: This water cooling or heating machine is constructed such that there is provided a trap 20 for forming a free liquid surface at an outlet of a high temperature regenerator 1 and there are further provided a first (temperature sensor 20-1 of sensing temperature of an upper part of the trap 20, a second temperature sensor 20-2 for sensing a temperature at a lower side of the trap and a third temperature sensor 20-3 for sensing a temperature at a liquid chase section at the most-lower end of a return pipe. Then, temperatures of the first temperature sensor 20-1 and the third temperature 20-3 are compared with temperature of the second temperature sensor 20-2 and the third temperature sensor 20-3 so as to detect presence or non-presence of the liquid surface at each of upper and lower parts of the trap. With such an arrangement as above, there is provided means for controlling a solution circulating amount of the high temperature regenerator 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption chiller / heater, and more particularly to an absorption chiller / heater suitable for detecting the liquid level at the outlet of a high temperature regenerator and controlling the amount of solution circulation. It is.

[0002]

2. Description of the Related Art As a conventional technique for detecting the liquid level at the outlet of a high-temperature regenerator, for example, Japanese Patent Application Laid-Open No. 7-71837 is disclosed.
As described in JP-A-6-201211, there is a method in which a float box (liquid level detection box) is provided at the outlet of the high-temperature regenerator and a float valve is arranged. FIG. 6 is a system diagram of an absorption chiller / heater using a conventional float valve.

[0003] The absorption chiller / heater shown in FIG. 6 comprises an evaporator 4 for supplying cold water by evaporating a refrigerant, and a lithium bromide solution (hereinafter referred to as a solution) as an absorbent.
, A solution circulation pump 6 that circulates a thinned solution by absorbing the refrigerant, a high-temperature regenerator 1 that heats the thinned solution to separate and regenerate the refrigerant, and a high-temperature regenerator 1 A low-temperature regenerator 2 that regenerates the refrigerant by heating the solution with the residual heat of the regenerated refrigerant, a condenser 3 that condenses the regenerated refrigerant vapor, and sprays the solution that has separated and concentrated the refrigerant onto the absorber 5 It comprises a solution spray pump 9 and a float valve 10 for controlling the circulating amount of the solution entering the high-temperature regenerator 1 depending on the return level of the high-temperature regenerator solution. In addition, 7 is a low-temperature heat exchanger and 8 is a high-temperature heat exchanger.

The float valve 10 is configured such that the valve closes when the float sphere rises as the liquid level rises, and opens when the float sphere descends as the liquid level falls. If the amount of circulating solution sent to the high-temperature regenerator 1 is large, the float sphere rises together with the liquid level returning from the high-temperature regenerator 1 to the absorber 5, and the amount of circulating solution sent to the high-temperature regenerator 1 is reduced. If the amount of the solution circulated to the high-temperature regenerator 1 is small, the float sphere descends together with the return liquid level of the high-temperature regenerator 1, and the amount of the solution circulated to the high-temperature regenerator 1 increases. By this operation, the amount of solution circulation sent to the high-temperature regenerator 1 is controlled according to the return amount of the high-temperature regenerator 1.

[0005]

However, in the above-mentioned prior art, the solution passes through the valve body even when the float valve 10 is fully closed, and the valve body for suppressing the passing amount to the reference value. Processing was difficult and expensive. In particular, those having a small refrigerating capacity have a small solution circulation amount, so that the ratio of the passage amount through the valve to the circulation amount is high, and there is a disadvantage in the circulation amount control. In addition, to prevent the valve body from deteriorating due to the effects of dust in the solution and aging, and deforming in a high-temperature solution, it is necessary to increase the buoyancy and the weight of the float ball by increasing the size of the float ball. There was a disadvantage in terms of space.

Further, even if an abnormality occurs in the control of the amount of circulating solution due to various causes, there is no method for detecting a sign of the abnormality, so that highly reliable preventive maintenance cannot be performed.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and can detect the liquid level of a high-temperature regenerator by means having no movable part, and can appropriately control the amount of solution circulation.
An object of the present invention is to provide a safe and compact absorption chiller / heater. Another object of the present invention is to provide a reliable and preventive maintenance that can be easily retrofitted to a delivered machine employing various solution circulation amount controls without breaking vacuum. An absorption chiller / heater is provided.

[0008]

In order to achieve the above object, the most basic structure of the absorption chiller / heater according to the present invention is as follows.
A regenerator that heats and concentrates the dilute solution to separate the refrigerant vapor, a condenser that liquefies the refrigerant vapor generated by the regenerator, and heat-exchanges the refrigerant liquid with a cold / hot water pipe on the load side to evaporate the refrigerant. Absorption cold and hot water comprising an evaporator, an absorber for absorbing the refrigerant vapor generated by the evaporator into the concentrated solution sent from the regenerator, and a piping system for operatively connecting these devices. A device for measuring a liquid phase temperature of the regenerator and a temperature of a return solution pipe from the regenerator to the absorber to detect a liquid level position of the solution in the regenerator return pipe. It is.

More specifically, in the absorption chiller / heater, a temperature sensor is provided at each of at least two positions in the regenerator return pipe where liquid levels are to be detected, and another temperature is provided at the liquid phase at the lowermost end of the return pipe. A sensor for controlling a solution circulation amount of a regenerator by comparing a temperature of the liquid phase part with a temperature of the liquid phase part and detecting presence or absence of a liquid surface at two or more positions. It is.

[0010] In order to achieve the above object, a typical specific configuration of an absorption chiller / heater according to the present invention includes a high-temperature regenerator and a low-temperature regenerator for heating a dilute solution and concentrating the same to separate refrigerant vapor, A condenser for liquefying the refrigerant vapor generated in each of the regenerators, an evaporator for evaporating the refrigerant by exchanging the refrigerant liquid with a cold / hot water pipe on the load side, and a refrigerant vapor generated in the evaporator, In an absorption chiller / heater comprising an absorber for absorbing the concentrated solution sent from the regenerator and a piping system for operatively connecting these devices, a solution return pipe from the high-temperature regenerator to the absorber A trap for forming a free liquid level, a first temperature sensor for detecting a temperature above the trap, and a second temperature sensor for detecting a temperature below the trap.
And a third temperature sensor for detecting the temperature of the liquid phase portion at the lowermost end of the return pipe, wherein the temperature of the first temperature sensor and the temperature of the third temperature sensor, and the temperature of the second temperature sensor are provided. Means for controlling the solution circulation amount of the high-temperature regenerator by comparing the temperature of the high-temperature regenerator with the temperature of the third temperature sensor and detecting the presence or absence of a liquid level at each of the upper and lower portions of the trap. It is provided.

It should be noted that the absorption chiller / heater of the present invention has the following features. By controlling the solution circulation pump by the controller, the solution circulation amount can be controlled. Further, the absorption chiller / heater of the present invention can control the amount of solution circulation by providing an electromagnetic valve or the like in the outgoing solution pipe for the high-temperature regenerator and opening and closing the electromagnetic valve or the like by the controller.

Further, in the absorption chiller / heater of the present invention, since a temperature sensor is attached to the outer surface of the trap and the piping, the detection section does not require a seal portion for maintaining the vacuum of the absorption chiller / heater. . Further, the absorption chiller / heater of the present invention can monitor and record data detected by the temperature sensor, and can issue an alarm when the liquid level deviates from a normal control pattern.

The function of the above technical means is as follows. The amount of circulating solution returned from the high-temperature regenerator to the absorber (hereinafter simply referred to as the amount of circulating solution returned to the high-temperature regenerator) changes according to the pressure change of the high-temperature regenerator. Change. If the amount of solution circulating from the absorber to the high-temperature regenerator (hereinafter simply referred to as the high-temperature regenerator going solution circulation amount) is larger than the high-temperature regenerator return solution circulation amount, the amount of the solution that cannot be returned to the absorber in the high-temperature regenerator is increased. Solution starts to collect, and the liquid level in the high-temperature regenerator rises.

If the liquid level in the high-temperature regenerator rises too much, the solution in the absorber will decrease, the solution circulation pump at the absorber outlet will fail due to cavitation, or the boiling liquid level in the high-temperature regenerator will rise and the refrigerant will rise. There is a problem that the solution is mixed with the steam and the cooling capacity is reduced. Conversely, if the amount of circulation of the solution going to the high-temperature regenerator is smaller than the amount of circulation of the solution returning to the high-temperature regenerator, the high-temperature regenerator will boil down, causing metal destruction or non-condensable gas generation due to empty heating, and failures such as solution crystals There is a fear of causing.

Therefore, in the return pipe section of the high temperature regenerator solution,
A trap for forming a free liquid level is provided, a first temperature sensor for detecting the temperature of an upper portion of the trap, a second temperature sensor for detecting a temperature of a lower portion of the trap, and a temperature of a liquid phase at the lowermost end of the return pipe. Is provided, and the temperatures of the first and third temperature sensors and the temperatures of the second and third temperature sensors are compared. The temperature indicated by the sensor is lower when the inside of the sensor is in the gas phase, and is substantially the same when the sensor is in the liquid phase.

If the circulation amount of the solution going out of the high-temperature regenerator becomes larger than the circulation amount of the returning solution in the high-temperature regenerator, the liquid level in the trap rises before the liquid level in the high-temperature regenerator. When the first temperature sensor section is a gas phase section, the temperature of the first temperature sensor indicates a value lower than the temperature of the third temperature sensor, but when the liquid level rises to the first temperature sensor section, Is substantially equal to the temperature of the third temperature sensor. Therefore,
When the temperature of the first temperature sensor is substantially equal to the temperature of the third temperature sensor, it is determined that the outgoing solution circulation amount is too large, and the outgoing solution circulation amount is reduced or the returning solution circulation amount is increased. This can prevent the liquid level in the high-temperature regenerator from rising.

Conversely, when the circulation amount of the solution going out of the high-temperature regenerator is smaller than the circulation amount of the returning solution in the high-temperature regenerator, the liquid level in the trap falls before the liquid level in the high-temperature regenerator. As described above, when the second temperature sensor section is a liquid phase section, the temperature of the second temperature sensor indicates a value substantially equal to the temperature of the third temperature sensor, but the liquid temperature reaches the second temperature sensor section. When the surface descends,
The temperature of the second temperature sensor indicates a value lower than the temperature of the third temperature sensor. Therefore, when the temperature of the second temperature sensor becomes lower than the temperature of the third temperature sensor, it is determined that the outgoing solution circulation amount is too small, and the outgoing solution circulation amount is increased or the returning solution circulation amount is reduced. This can prevent the liquid level in the high-temperature regenerator from lowering.

Further, preventive maintenance can be performed by monitoring and recording data detected by the temperature sensor, and by issuing an alarm when the liquid level deviates from a normal control pattern.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. [Embodiment 1] First, the most typical embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a system diagram of a cooling cycle of an absorption chiller / heater according to an embodiment of the present invention, FIG. 2 is a flowchart of an electromagnetic valve opening / closing operation by a controller according to an embodiment of the present invention, and FIG.
FIG. 2 is a main part system diagram showing a preventive maintenance system in the absorption chiller / heater of FIG. 1.

In FIG. 1, 1 is a high temperature regenerator, 2 is a low temperature regenerator, 3 is a condenser, 4 is an evaporator, 5 is an absorber, 6 is a solution circulation pump, 7 is a low temperature heat exchanger, and 8 is a high temperature regenerator. Heat exchanger,
9 is a solution spray pump. In addition, as elements according to the present invention, 20 is a trap installed at the outlet of the high-temperature regenerator 1, 20-1 is a first temperature sensor attached to the upper part of the trap, and 20-2 is a second temperature sensor attached to the lower part of the trap. A temperature sensor, 20-3 is a third temperature sensor attached to the return solution pipe (concentrated solution pipe 12) at the trap outlet,
Reference numeral 21 denotes a controller that opens and closes the electromagnetic valve 24 based on signals received from the temperature sensors. Reference numerals 22 and 23 denote orifices that adjust the amount of solution circulated to the high-temperature regenerator, and controls the amount of solution circulated by the resistance of the orifice. Reference numeral 24 denotes an electromagnetic valve provided in the diluted solution piping 11 system.

First, the flow of the cooling cycle will be described with reference to FIG. The solution in the absorber 5 is supplied to a solution circulation pump 6
Is sent to the high-temperature regenerator 1 and the low-temperature regenerator 2 through the dilute solution pipes 11 and 11a. In the high-temperature regenerator 1, the sent solution is heated by the heating source 1a and separated into a high-temperature and high-pressure refrigerant vapor and a concentrated solution. The concentrated solution passes through the concentrated solution pipe 12 due to the pressure difference, merges with the concentrated solution returned from the low-temperature regenerator 2 described later, and is returned to the absorber 5 by the solution spray pump 9.

On the other hand, the refrigerant vapor generated in the high-temperature regenerator 1 is sent to the low-temperature regenerator 2 through the refrigerant vapor pipe 13, and in the low-temperature regenerator 2, the dilute solution pipe 1 is supplied by the solution circulation pump 6.
The solution sent through 1a is heated and separated into a refrigerant vapor and a concentrated solution. The solution itself becomes a liquid refrigerant and is sent to the condenser 3 through the pipe 13. The concentrated solution separated by the low-temperature regenerator 2 passes through the concentrated solution pipe 12 a, merges with the concentrated solution returned from the high-temperature regenerator 1, and is returned to the absorber 5. Further, the refrigerant vapor generated in the low-temperature regenerator 2 is sent to the condenser 3 via the flow path 14.

In the condenser 3, the refrigerant vapor generated in the low-temperature regenerator 2 and the refrigerant generated in the high-temperature regenerator 1 are cooled in the heat exchange unit 3 a of the cooling water system 15, become liquid refrigerant, and supplied to the evaporator 4. In the evaporator 4, the liquid refrigerant is supplied to the heat exchange section 4 of the cold water system 16.
Cold water is supplied to the customer by evaporating and evaporating by exchanging heat with a. The refrigerant vapor generated in the evaporator 4 is supplied to the flow path 17.
Enters the absorber 5 and is absorbed by the solution.

Next, a specific operation in the embodiment of the present invention will be described. When the balance between the high-temperature regenerator return solution circulation amount of the concentrated solution pipe 12 and the high-temperature regenerator solution circulation amount of the dilute solution pipe 11 is out of balance, the liquid level in the high-temperature regenerator 1 rises to cause mist up or high-temperature regeneration. The liquid level of the vessel 1 may drop and become clogged, causing problems.

Therefore, the temperature indicated by the temperature sensor 20-1 is T1, the temperature indicated by the temperature sensor 20-2 is T2,
The temperature indicated by the temperature sensor 20-3 is T3, a and b are set as thresholds, and the solenoid valve is controlled according to the flowchart shown in FIG. That is, when T3−T1 <a, the electromagnetic valve 24 is closed to reduce the amount of solution circulation in the dilute solution pipe 11 going to the high-temperature regenerator. When T3−T2> b, the electromagnetic valve 24 is opened to increase the amount of solution circulated to the high-temperature regenerator. In this manner, by maintaining the state of opening and closing the solenoid valve, the balance between the amount of solution circulation returned to the high-temperature regenerator and the amount of solution circulation going to the high-temperature regenerator can be maintained, and the change in the amount of solution circulation can be coped with. Here, when the electromagnetic valve 24 is opened, the solution flows to both the orifices 22 and 23, and the solution circulation amount increases.

In the present embodiment, the position of the third temperature sensor 20-3 is established even when the temperature of the liquid phase portion of the high temperature regenerator 1 is changed. If a liquid phase exists, the temperature of the liquid phase in the return pipe is superior to the temperature change of the first temperature sensor 20-1 and the second temperature sensor 20-2. Confirmed experimentally.

In the absorption chiller / heater of this embodiment, since the temperature sensor is attached to the outer surface of the trap 20 and the concentrated solution pipe 12, the reliability of the absorption chiller / heater with respect to the vacuum holding in the detection unit is not impaired. In addition, since the temperature sensor itself does not come into contact with the solution, highly reliable control can be performed for a long time. In the absorption chiller / heater of the present embodiment, it is also possible to increase the number of temperature sensors to perform finer liquid level detection and to increase the number of solenoid valves to perform finer circulation amount control. Also, by using the conventional float valve and the solution circulation pump rotation speed control of the present invention together, highly reliable circulation amount control can be performed.

As a control method in the absorption chiller / heater of the present embodiment, as shown in FIG.
The following system can be realized by providing a service station S using TT communication means and setting a control device and a control circuit. (1) A system that issues a warning or displays a warning when the state of T3−T1 <a continues for longer than a predetermined time. (2) A system for issuing a warning or displaying when the state of T3−T2> b continues for longer than a predetermined time.

(3) A system in which the number of temperature sensors is increased and a warning is issued or displayed when the liquid level at the upper or lower part of the trap is detected. (4) A system for issuing a warning or displaying when the number of times (1), (2), and (3) exceeds the set number. (5) A system having a function of recording and holding the occurrence of the above (1), (2), (3), and (4). (6) A system in which when the above (1), (2), (3), and (4) occur, it is determined that a failure has occurred, and the operation is stopped before a serious failure occurs.

(7) A system having a function of reducing the heat input to the high-temperature regenerator and continuing the operation in the case of the above (2). (8) A system that displays the measured temperature or the detected liquid level as operation status data, and remotely recognizes the operation status by transmitting and transmitting data. (9) A system that counts the number of times the solenoid valve is opened and closed. (10) A system for issuing a warning or displaying when the number of times in the above (9) becomes larger than a set number within a predetermined time.

The alarm, display and monitoring system of the above (1) to (8) does not require vacuum breakage of the absorption chiller / heater at the time of installation, and is applicable to diagnosis of other solution circulation amount control. Preventive maintenance can be performed easily by attaching to already delivered machines. It goes without saying that the preventive maintenance system shown in FIG. 3 can be similarly applied to each absorption chiller / heater of FIGS. 4 and 5 described below.

[Embodiment 2] FIG. 4 is a system diagram of a cooling cycle of an absorption chiller / heater according to another embodiment of the present invention. In the figure, components having the same reference numerals as those in FIG. 1 are the same as those in the previous embodiment, and the description thereof will be omitted. FIG.
Is different from the embodiment of FIG. 1 in that
That is, the solution circulation pump 6 is connected to the controller 21.

In the absorption chiller / heater shown in FIG. 4, (1) T3
When −T1 <a, the solution circulation pump 6 is controlled by an inverter or the like to reduce the amount of solution circulation going to the high-temperature regenerator.
(2) When T3−T2> b, the solution circulation pump 6 is controlled by an inverter or the like to increase the amount of solution circulation going to the high-temperature regenerator, thereby increasing the amount of solution circulation returned to the high-temperature regenerator and the amount of solution going to the high-temperature regenerator. The balance of the amount of circulation was maintained. When controlling the solution circulation pump 6 with an inverter, increasing the number of temperature sensors allows smoother solution circulation amount control.

[Embodiment 3] FIG. 5 is a system diagram of a cooling cycle of an absorption chiller / heater according to still another embodiment of the present invention. In the figure, components having the same reference numerals as those in FIG. 1 are the same as those in the previous embodiment, and the description thereof will be omitted. The embodiment of FIG. 5 differs from the embodiment of FIG. 1 in that an electromagnetic valve 27 connected to a controller 21 is provided in a concentrated solution pipe 12 which is a solution circulation system for returning to a high-temperature regenerator. Reference numerals 25 and 26 denote orifices for adjusting the circulation amount of the solution returned to the high-temperature regenerator.

In the absorption chiller / heater shown in FIG. 5, (1) T3
When −T1 <a, the electromagnetic valve 27 is opened to increase the amount of solution circulation returning to the high-temperature regenerator. (2) When T3−T2> b, the electromagnetic valve 27 is closed to allow solution circulation to return to the high-temperature regenerator. By reducing the amount, the balance of the circulation amount of the solution returned to the high-temperature regenerator and the circulation amount of the solution going to the high-temperature regenerator is maintained.

The present embodiment is characterized in that the amount of circulating solution returned to the high-temperature regenerator can be increased or decreased, and the dilution time can be shortened by increasing the amount of circulating solution returned to the high-temperature regenerator when the dilution is stopped. .

According to each of the above embodiments, the high-temperature regenerator 1
Trap 20 installed at the exit of the upper part of the trap 20,
First, second, and third temperature sensors 20-1, 20-2, and 2 attached to the lower portion and the outlet pipe of the trap 20.
By 0-3, the balance between the circulation amount of the solution going out of the high-temperature regenerator and the circulation amount of the returning solution is detected as the liquid surface position in the trap,
An absorption chiller / heater capable of avoiding problems caused by rising or lowering of the liquid level of the high-temperature regenerator by adjusting the circulation amount of the solution going to or from the high-temperature regenerator by opening / closing the solenoid valves 24 and 27 or the like. Can be provided.

This makes it possible to control the float valve with a smaller size and less differences in solids than the conventionally used float valve, and with high reliability. In addition, during the operation of the absorption chiller / heater, the balance of the circulation amount of the solution can be continuously detected, so that the operation can be monitored during normal operation or a warning can be issued before a failure occurs to perform maintenance. Not only can a serious failure be avoided, but also the life of the absorption chiller / heater can be extended.

Furthermore, since the balance of the circulation amount of the solution can be recorded, the operating condition before the failure can be grasped at the time of the failure, so that the cause of the failure can be accurately investigated in a short time. It is reduced. In addition, the above monitoring, alarm, and recording system does not require vacuum breakage of the absorption chiller / heater at the time of installation, and is effective for other machines that have other circulation volume controls. It can be easily installed, and can exhibit a preventive maintenance effect.

[0040]

As described in detail above, according to the present invention, the liquid level of the high-temperature regenerator is detected by means having no movable part,
It is possible to provide a safe and compact absorption chiller / heater capable of performing appropriate solution circulation amount control. In addition, according to the present invention, an absorption device that can be easily attached to a delivered machine employing various solution circulation volume controls without breaking vacuum and that can perform highly reliable preventive maintenance. A hot and cold water machine can be provided.

[Brief description of the drawings]

FIG. 1 is a system diagram of a cooling cycle of an absorption chiller / heater according to an embodiment of the present invention.

FIG. 2 is a flowchart of an electromagnetic valve opening / closing operation by a controller according to one embodiment of the present invention.

FIG. 3 is a main part system diagram showing a preventive maintenance system in the absorption chiller / heater of FIG. 1;

FIG. 4 is a system diagram of a cooling cycle of an absorption chiller / heater according to another embodiment of the present invention.

FIG. 5 is a system diagram of a cooling cycle of an absorption chiller / heater according to still another embodiment of the present invention.

FIG. 6 is a system diagram of a conventional absorption chiller / heater using a float valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... High temperature regenerator, 2 ... Low temperature regenerator, 3 ... Condenser, 4 ... Evaporator, 5 ... Absorber, 6 ... Solution circulation pump, 7 ... Low temperature heat exchanger, 8 ... High temperature heat exchanger, 9 ... Solution Spray pump, 2
0: trap, 20-1: first temperature sensor, 20-2
... 2nd temperature sensor, 20-3 ... 3rd temperature sensor, 2
1 ... controller, 24, 27 ... solenoid valve, 22, 23,
25, 26 ... orifice.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomihisa 603, Kandamachi, Tsuchiura-shi, Ibaraki Pref. Inside the Tsuchiura Plant, Hitachi Ltd. Inside the Tsuchiura Works

Claims (8)

[Claims] 1. A regenerator for heating and condensing a dilute solution to separate refrigerant vapor, a condenser for liquefying refrigerant vapor generated by the regenerator, and heat-exchanging the refrigerant liquid with a cold / hot water pipe on a load side. An evaporator for evaporating the refrigerant, an absorber for absorbing the refrigerant vapor generated in the evaporator into the concentrated solution sent from the regenerator, and a piping system for operatively connecting these devices. Means for measuring the liquid phase temperature of the regenerator and the temperature of the return solution pipe from the regenerator to the absorber to detect the liquid level of the solution in the regenerator return pipe. An absorption chiller / heater comprising: 2. The absorption chiller / heater according to claim 1,
Temperature sensors are provided at positions where at least two or more liquid levels are to be detected in the regenerator return pipe portion, and another temperature sensor is provided in a liquid phase portion at the lowermost end of the return pipe. An absorption chiller / heater for controlling the amount of solution circulation of a regenerator by comparing the temperature of the liquid phase part and detecting the presence or absence of a liquid surface at two or more positions. 3. The absorption chiller / heater according to claim 1,
An absorption chiller / heater having a function of adjusting the amount of solution circulating in and out of the regenerator according to the level of the solution returned to the regenerator. 4. The absorption chiller / heater according to claim 1,
An absorption chiller / heater having a function of adjusting a solution circulation amount of a regenerator return according to a liquid level position of a regenerator return solution. 5. A high-temperature regenerator and a low-temperature regenerator for heating and concentrating a dilute solution to separate refrigerant vapor, a condenser for liquefying refrigerant vapor generated in each of the regenerators, and a refrigerant liquid on the load side. An evaporator that evaporates the refrigerant by exchanging heat with the hot and cold water pipes, an absorber that absorbs the refrigerant vapor generated by the evaporator into the concentrated solution sent from each of the regenerators, and operatively operates these devices. An absorption chiller / heater comprising a piping system to be connected, wherein a trap for forming a free liquid surface is provided in a solution return piping section from the high-temperature regenerator to the absorber, and the temperature of an upper portion of the trap is detected. A second temperature sensor for detecting the temperature of the lower portion of the trap, and a third temperature sensor for detecting the temperature of the liquid phase at the lowermost end of the return pipe.
A temperature sensor of the first temperature sensor and the temperature of the third temperature sensor,
And comparing the temperature of the second temperature sensor with the temperature of the third temperature sensor, and detecting the presence or absence of a liquid level at each of the upper part and the lower part of the trap. An absorption chiller / heater comprising means for controlling a circulation amount. 6. The absorption chiller / heater according to claim 1, further comprising a failure prediction or failure diagnosis means for issuing an alarm when a solution level returned from the regenerator deviates from a normal control pattern. An absorption chiller / heater. 7. The absorption chiller / heater according to claim 1, wherein the measured temperature or the detected liquid level is displayed as operation status data, and the operation status is remotely transmitted and transmitted by transmitting and receiving the data. An absorption chiller / heater comprising: a grasping means. 8. The absorption chiller / heater according to claim 5,
When the high temperature regenerator heating means is stopped, open the flow control solenoid valve provided in the middle of the flow path returning from the high temperature regenerator to the absorber,
An absorption chiller / heater characterized by increasing the circulation amount of a high-temperature regenerator.