JPH10220901A - Absorbing type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbing type air conditioner in which an error stopping (maloperation) at the time of hot starting or in the case that a surrounding atmosphere temperature is high can be prevented and an error stopping is carried out only when a cooling water circuit shows an abnormal state. SOLUTION: In an absorbing type air conditioner A in which a controller 9 controls the number of rotation of a cooling tower fan 111 during a cooling operation in such a way that a temperature of cooling water 10 may be kept at a set temperature (31.5 deg.C, for example) and further controls an input amount of a gas burner 311 in such a way that a temperature of the cooling water 10 supplied to an indoor heat exchanger 21 may be kept at a set temperature (9 deg.C, for example), as a temperature of the cooling water 10 is increased more than a monitoring temperature (38 deg.C or more, for example), a monitoring operation for a temperature of the cooling water 10 is commanded from a time in which 20 seconds have elapsed from a starting of electrical energization for a cooling water pump 13 and the cooling tower fan 111.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an absorption type air conditioner using an absorption liquid.

[0002]

2. Description of the Related Art A cooling tower, an absorber heat transfer pipe, and a condenser heat transfer pipe are sequentially connected in a ring shape, and a cooling water circuit for circulating cooling water by a cooling water pump during a cooling operation, and an indoor heat source provided with a blower fan. An exchanger and an evaporator heat transfer tube are connected in a ring, a chilled / hot water circuit that circulates chilled / hot water with a chilled / hot water pump, and a refrigerant in the low-concentration absorbing liquid during cooling operation when the absorbing liquid is put in and the heating section is heated by a gas burner. A regenerator that vaporizes and separates into a high-concentration absorbing liquid and a vapor refrigerant, a condenser in which a high-temperature vapor refrigerant is sent from the regenerator during cooling operation and the condenser heat transfer tube is disposed, and the condenser during cooling operation. An evaporator for evaporating a liquefied liquid refrigerant under a low pressure; a heat transfer tube arranged in parallel with the evaporator; a high-concentration absorbing liquid sent from the regenerator for vapor refrigerant evaporated by the evaporator during cooling operation. To An absorbing liquid circuit having an absorber to be collected and a solution pump for returning the absorbing liquid in the absorber to the high-temperature regenerator; and, during cooling operation, the temperature of the cold and hot water supplied to the indoor heat exchanger is set to a set temperature (for example, 7). ° C), the input of the gas burner is proportionally controlled (for example, 15 ° C).
In recent years, an absorption-type air conditioner that does not use Freon, which has a controller for controlling the air flow rate from 00 kcal / h to 4800 kcal / h) and cools the room by blowing the cool air into the room by the blower fan, has attracted attention in recent years.

When the temperature of the cooling water becomes higher than the monitoring temperature during the cooling operation, liquefaction of the vapor refrigerant or the like sent to the condenser,
Absorption of the vapor refrigerant in the absorber is hindered, evaporation of the liquid refrigerant in the evaporator is hindered, the temperature of the cold and hot water does not drop to the set temperature, and the heating power increases based on this, so that the regenerator overheats, etc. Causes a malfunction. For this reason, the absorption-type air conditioner is usually provided with a cooling water monitoring unit that stops an error when the temperature of the cooling water rises above the monitoring temperature (for example, 38 ° C. or more). The causes of the cooling water temperature exceeding the monitoring temperature (for example, 38 ° C.) include abnormalities in the cooling water circuit (decrease in the amount of cooling water, failure of a fan attached to the cooling tower,
Failure of the cooling water pump).

[0004]

However, even if there is no abnormality in the cooling water circuit (a decrease in the amount of cooling water, a failure in the fan, a failure in the cooling water pump, etc.), there is no problem in restarting immediately after the operation is stopped (hot start). The present inventors have found that when the outside air temperature is high, the temperature of the cooling water becomes higher than the monitoring temperature (for example, 38 ° C.) and an error stop (malfunction) may occur.

An object of the present invention is to provide an absorption type air conditioner which can prevent an error stop (malfunction) at a hot start or when the outside air temperature is high, and can stop an error only when a cooling water circuit is abnormal.

[0006]

In order to solve the above problems, the present invention employs the following constitution. (1) A cooling tower provided with a 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 during cooling operation and a blower fan are provided. An indoor heat exchanger and an evaporator heat transfer tube are connected in a ring, a chilled / hot water circuit that circulates chilled / hot water by a chilled / hot water pump, and an absorbing liquid is put in and the heating unit is heated by a heating source to absorb low concentrations during cooling operation. A regenerator that vaporizes the refrigerant in the liquid and separates it into a high-concentration absorption liquid and a vapor refrigerant,
A condenser in which the condenser heat transfer tube is disposed and a high-temperature vapor refrigerant is sent from the regenerator during a cooling operation, an evaporator that evaporates a liquid refrigerant liquefied by the condenser at a low pressure during a cooling operation, and an evaporator. An absorber that is provided in parallel with the absorber heat transfer tube and absorbs the vapor refrigerant evaporated by the evaporator into a high-concentration absorbent sent from the regenerator during cooling operation, and regenerates the absorbent in the absorber. An absorbing liquid circuit having a solution pump returning to the vessel, a cooling water temperature detecting means for detecting a temperature of the cooling water, a cold / hot water temperature detecting means for detecting a temperature of the cold / hot water, the cooling water pump, the cold / hot water pump, Controls the heating source and the solution pump, and controls the heating power of the heating source so that the temperature of the cold / hot water supplied to the indoor heat exchanger is maintained at a set temperature during a cooling operation. Above the monitoring temperature When the cooling water temperature is detected in the absorption type air conditioning apparatus comprising a controller for instructing the error stop,
Even if the cooling water temperature detecting means detects the cooling water temperature equal to or higher than the monitoring temperature, the controller does not instruct the error stop based on the cooling water temperature during the predetermined time at the beginning of the cooling operation.

(2) The cooling water temperature detecting means having the configuration of the above (1) is in an operation stop state until the predetermined time at the beginning of the cooling operation elapses, and the controller is controlled by the controller. Disabled error stop instruction.

(3) Having the configuration of (1) or (2) above, timing of the predetermined time is started by starting the fan. (4) Having the configuration described in (1) or (2) above, timing of the predetermined time is started by starting the cooling water pump.

[0009]

The heating section of the regenerator containing the absorbing liquid is heated by a heating source. During the cooling operation, the controller controls the heating power of the heating source so that the temperature of the cold / hot water supplied to the indoor heat exchanger is maintained at the set temperature. During the cooling operation, the refrigerant of the low concentration absorbing liquid in the regenerator is vaporized and separated into the high concentration absorbing liquid and the vapor refrigerant. During the cooling operation, high-temperature vapor refrigerant is sent from the regenerator to the condenser. During the cooling operation, since the cooling water flows through the condenser heat transfer tubes, the high-temperature vapor refrigerant is liquefied and accumulated in the condenser.

[0010] During the cooling operation, the liquid refrigerant sent from the condenser into the evaporator is sprayed on the evaporator heat transfer tube through which the cold and hot water flows, takes away heat of vaporization and evaporates, and cools the cold and hot water. Then, the cooled cold / hot water is supplied to the indoor heat exchanger by the cold / hot water pump, and the indoor cooling is performed by the blower fan.

During the cooling operation, the vapor refrigerant evaporated in the evaporator and entering the absorber is absorbed by the high-concentration absorbing liquid sent from the regenerator, and becomes a low-concentration absorbing liquid and accumulates in the absorber. The absorbent collected in the absorber is returned to the regenerator by the solution pump. The cooling water temperature is high in a hot start (restarting the operation without a long time after the cooling operation is stopped) or when the outside air temperature is high (particularly at the start of the operation).

(Claim 1) If the cooling operation is started in this state, the cooling water temperature detecting means may detect a cooling water temperature higher than the monitoring temperature and cause an error stop (malfunction). Even if the means detects the cooling water temperature equal to or higher than the monitoring temperature, the controller does not instruct the error stop based on the cooling water temperature for a predetermined time at the beginning of the cooling operation. When a predetermined time has elapsed from the start of the cooling operation, the controller starts an operation to instruct an error stop when a cooling water temperature equal to or higher than the monitoring temperature is detected.

If there is no abnormality in the cooling water circuit (reduction of the cooling water amount, failure of the fan, failure of the cooling water pump, etc.), the temperature of the cooling water falls below the monitored temperature due to the operation of the cooling tower and the circulation of the cooling water. Error stop is not instructed.
In addition, if there is an abnormality in the cooling water circuit, even if a predetermined time has elapsed, a cooling water temperature higher than the monitoring temperature is detected, and an error stop is instructed. 』

(Claim 2) "If the cooling operation is started in this state, the cooling water temperature detecting means may detect the cooling water temperature higher than the monitoring temperature and cause an error stop (malfunction). The cooling water temperature detecting means is in an operation stop state until a predetermined time at the beginning of the cooling operation elapses until a predetermined time at the start of the cooling operation elapses. As a result, during the predetermined time period at the beginning of the cooling operation, even if the cooling water temperature is equal to or higher than the monitoring temperature, the controller cannot enter the error stop.

If there is no abnormality in the cooling water circuit (reduction of the cooling water amount, failure of the fan, failure of the cooling water pump, etc.), after a predetermined time has elapsed, the operation of the cooling tower and the circulation of the cooling water cause the cooling water to flow. The controller does not command an error stop because the temperature is below the monitored temperature. If there is an abnormality in the cooling water circuit, the cooling water detecting means detects the cooling water temperature equal to or higher than the monitoring temperature when a predetermined time has elapsed, so that the controller instructs an error stop.

In the configuration of the third aspect, the timing of the predetermined time is started by starting the fan. Claim 4
In the above configuration, the timing of the predetermined time is started by starting the cooling water pump.

[0017]

【The invention's effect】

[Claims 1, 2, 3, and 4] Even if the cooling water temperature is high at the time of starting the cooling operation (at the time of a hot start or when the outside air temperature is high), an error stop (malfunction) at the start of the cooling operation. And the cooling operation can be continued. Therefore, the error stop is performed only when there is an abnormality in the cooling water circuit (a decrease in the amount of cooling water, a failure in the fan, a failure in the cooling water pump, etc.), thereby preventing overheating of the regenerator and crystallization of the absorber.

[Claims 3 and 4] Since the timing of the predetermined time is started by starting the fan or the cooling water pump, the time when the temperature of the cooling water falls below the monitoring temperature (when the cooling water circuit is normal). Can be reliably predicted, and an error stop (malfunction) does not occur when the cooling operation is started.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention (Claim 1,
3 and 4) will be described with reference to FIGS. As shown in the figure, the absorption type air conditioner A has a cooling water circuit 1 for circulating cooling water 10 during cooling operation, a cooling / heating water circuit 2 for circulating cooling / heating water 20 during cooling / heating operation, a high temperature regenerator 3, The system includes an absorption liquid circuit 8 composed of a low-temperature regenerator 4, a condenser 5, an evaporator 6, an absorber 7, and a solution transfer section 801 of a tandem pump 80, and a controller 9.

The cooling water circuit 1 includes a cooling tower 11 provided with a cooling tower fan 111, a cooling water tank 12, a cooling water pump 13, an absorber heat transfer pipe 14, and a condenser heat transfer pipe 15 which are sequentially connected in a ring shape. Cooling water pump 1 during cooling operation.
3 is operated to circulate the cooling water 10.

During the cooling operation, the cooling tower fan 111 is driven by a motor 112, and the number of revolutions of the motor 112 is controlled by the controller 9 so that the cooling water temperature detected by the cooling water temperature sensor 91 is maintained at 31.5 ° C. Controlled.

The cooling water temperature sensor 91 is disposed in a cooling water pipe 101 connecting the cooling water pump 13 and the absorber heat transfer pipe 14, and the cooling water 10 supplied to the absorber heat transfer pipe 14.
Detect the temperature of In the heating operation (see FIG. 4),
All the cooling water 10 in the cooling water circuit 1 is drained, and the motor 11
2 and the cooling water pump 13 are not energized.

The cold / hot water circuit 2 includes an indoor heat exchanger 21 provided with a blower fan 211, a water level sensor (not shown), a cistern 22, and a cold / hot water transfer section 80 of a tandem pump 80.
2. The evaporator heat transfer tubes 24 are connected in a ring shape, and the cold and hot water 20 is circulated by the cold and hot water transfer unit 802.

The high-temperature regenerator 3 is composed of a boiler 31 for heating the absorbent by a gas burner 311, a separation tube 32 erected from the boiler 31, and a collecting vessel 33. Low-concentration absorbing solution
0; a refrigerant (water) contained in a 58% aqueous lithium bromide solution is evaporated to be separated into a medium concentration absorbing liquid (hereinafter referred to as an intermediate liquid 34; a 60% aqueous lithium bromide solution) and a vapor refrigerant 35. I do.

The gas burner 311 is of a Bunsen type,
Gas is supplied by a gas pipe 315 having gas solenoid valves 312, 313 and a gas proportional valve 314 connected thereto, and combustion air in an amount corresponding to the gas amount is supplied by a combustion fan 316 and burned.

321 is a gap for heat insulation. or,
An HGE temperature sensor 301 for detecting the temperature of the dilute liquid 30 in the high-temperature regenerator 3 (hereinafter, referred to as HGE temperature) is provided at an appropriate position of the evaporator 31. Cold / hot water sensor 201
Is disposed in the cold / hot water pipe 29 on the inlet side of the indoor heat exchanger 21 and detects the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21.

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 surrounds the collection container 33,
During the cooling operation, the intermediate liquid 34 is heated by receiving heat from the collection container 33. As a result, a part of the middle liquid 34 is vaporized and separated into a high concentration absorbing liquid (hereinafter, referred to as a concentrated liquid 41; a 62% aqueous lithium bromide solution) and a vapor refrigerant 42.

In the heating operation in which the cooling / heating switching valve 36 is opened, the middle liquid pipe 344 has a flow path resistance caused by the orifice 343, so that all the middle liquid 34 flows into the heating pipe 361 and is sent to the low temperature regenerator 4. Absent.

In the condenser 5, vapor refrigerants 35 and 42 are sent from the high temperature regenerator 3 and the low temperature regenerator 4 to the condenser 5, and the vapor refrigerants 35 and 42 are cooled by flowing through the coil-shaped condenser heat transfer tube 15. Liquid refrigerant (water) cooled by water 10
52 accumulates at the bottom of the condenser 5. The absorber heat transfer tube 14
The cooling water 10 that has passed through the condenser heat transfer tube 15 and has been heated (37.5 ° C.) is cooled (31.5 ° C.) in the cooling tower 11.

The evaporator 6 includes a coil-shaped evaporator heat transfer tube 24.
Is arranged. Since the cooling / heating switching valve 36 is opened during the heating operation, the high-temperature absorbent in the high-temperature regenerator 3 is sent to the evaporator 6 via the cooling / heating switching valve 36 → the heating pipe 361. During the cooling operation, the liquid refrigerant 52 is
→ sprayed on the evaporator heat transfer tube 24 via the sprayer 55,
Since the inside of the evaporator 6 is substantially vacuum (about 6.5 mmHg),
The liquid refrigerant 52 evaporates by taking heat of vaporization from the cold / hot water 20 flowing in the evaporator heat transfer tube 24.

Then, the cooled cold / hot water 20 exchanges heat with the air blown into the room by an indoor heat exchanger 21 disposed inside the room to raise the temperature, and the heated cold / hot water 20 is again supplied to the evaporator heat transfer tube. Cooled through 24.

The absorber 7 provided with the absorber heat transfer tube 14 is:
The upper part and the lower part are connected to the evaporator 6 and are connected to the evaporator 6. Then, during the cooling operation, the vapor refrigerant evaporated in the evaporator 6 enters the absorber 7 from above and enters the low-temperature regenerator 4.
→ Concentrate pipe 411 → Low temperature heat exchange channel 412 → Concentrate pipe 4
13 → The diluted liquid 30 which is absorbed by the concentrated liquid 41 sprayed onto the absorber heat transfer tube 14 via the sprayer 70 and becomes low in concentration accumulates at the bottom of the absorber 7. During the heating operation, high-temperature absorbing liquid enters the absorber 7 from the evaporator 6.

The tandem pump 80 to which a Hall element (not shown) is attached is a three-phase DC brushless motor operated at AC-100V, and includes a solution transfer unit 801 and a cold / hot water transfer unit 802.

During the cooling operation, the rotation of the tandem pump 80 is controlled based on the HGE temperature-rotation speed operation line. In the heating operation, the rotation is controlled based on the input-rotation speed operation line. Note that, instead of the tandem pump 80, a cold / hot water pump and a solution pump may be provided.

The diluted liquid 30 accumulated at the bottom of the absorber 7 is diluted with a diluted liquid pipe 71 → a solution transfer section 801 → a diluted liquid pipe 72 → low temperature
The high-temperature heat exchange channel 73 is sent to the boiler 31 of the high-temperature regenerator 3 via the diluted liquid pipe 74.

The controller 9 includes an operation switch (not shown),
A water level sensor in the cistern, an HGE temperature sensor 301 for detecting the temperature of the absorbent in the boiler 31, and the indoor heat exchanger 21
A cold / hot water sensor 201 for detecting the temperature of the cold / hot water 20 supplied to the heater, an EVA temperature sensor 61 for detecting the internal temperature of the evaporator 6, a Hall element, and a temperature of the cooling water 10 to be supplied to the absorber heat transfer tube 14. The following is controlled based on a signal from the cooling water temperature sensor 91.

Water supply valve 221, gas solenoid valves 312, 31
3, gas proportional valve 314, tandem pump 80, cooling water pump 13, cooling tower fan 111, combustion fan 316,
And a cooling / heating switching valve 36.

An outline of the operation of the absorption air conditioner A during the cooling operation will be described with reference to FIG. In the high-temperature regenerator 3 containing the absorbing liquid, the boiler 31 is heated by the gas burner 311. Thereby, the refrigerant in the dilute liquid 30 is vaporized and separated into the intermediate liquid 34 and the vapor refrigerant 35. The middle liquid 34 is heated by the collection container 33 in the low-temperature regenerator 4,
1 and a vapor refrigerant 42. High-temperature vapor refrigerants 35 and 42 are sent from the high-temperature regenerator 3 and the low-temperature regenerator 4 to the condenser 5.

The liquid refrigerant 52 sent from the condenser 5 to the evaporator 6 is sprayed on the evaporator heat transfer tube 24 through which the cold and hot water 20 flows, evaporates by taking heat of vaporization, and the evaporated vapor refrigerant is absorbed by the absorber 7. And the concentrated liquid 41 sent from the low-temperature regenerator 4
Is absorbed in the absorber 7 as a dilute solution 30 and accumulated in the absorber 7. The solution transfer unit 801 of the tandem pump 80
Is returned to the boiling unit 31.

When the liquid refrigerant evaporates on the evaporator heat transfer tube 24 through which the cold / hot water 20 flows, the cold / hot water 20 is cooled and the cooled cold / hot water 20 is transferred to the cold / hot water transfer section 80 of the tandem pump 80.
2 to the indoor heat exchanger 21 to be sent to the indoor heat exchanger 21
, And cool air is blown into the room by the blower fan 211 to perform indoor cooling. At this time, the indoor controller 25 shown in FIG. 2 operates the flow control valve 27 and the blower fan 211 so that the room temperature detected by the room temperature sensor 26 becomes the set room temperature set by the room temperature setting device (not shown). Control.

When the cooling operation is stabilized (cold / hot water ≦ 9 ° C.),
The controller 9 performs proportional control of the input of the gas burner 311 based on the output of the cold / hot water sensor 201 so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 7 ° C. (cooling proportional control; 1500 kcal / h ~ 4800kcal
/ H). Note that the controller 9 performs the cooling proportional control at the time of this cooling proportional control.
When the temperature of the cooling water 10 supplied to the absorber heat transfer tube 14 is 3
The cooling tower fan 111 is controlled so as to be maintained at 1.5 ° C.

Next, the operation of the absorption type air conditioner A during the cooling operation will be described in detail with reference to the operation explanatory diagram of FIG. 3 and the flowcharts of FIGS. When the user turns on the cooling operation switch (not shown), the microcomputer of the controller 9 operates based on the flowchart of FIG.

Instructing the water supply valve 221 to open, a cooling tower process (CT process) for storing water in the cooling water pipe 1 and the cooling water tank 12 of the cooling water circuit 1 via the cistern 22 in step s1. And proceed to step s2. In step s2, based on the output of the HGE temperature sensor 301, it is determined whether or not the HGE temperature is equal to or higher than 80 ° C. If the HGE temperature is equal to or higher than 80 ° C. (YES; hot start), the process proceeds to step s3, If less than (NO; cold start), the process proceeds to step s14.

In the case of a hot start, an ignition operation is performed in step s3. The cooling / heating switching valve 36 is kept closed. In step s4, the cooling operation is started by setting the input to 2500 kcal / h, and the timer is started at the same time when the cooling water pump 13 and the cooling tower fan 111 are energized. When the HGE temperature reaches 100 ° C., the power supply to the tandem pump 80 is started.

It is determined in step s5 whether or not cooling water temperature ≧ 38 ° C. (monitoring temperature) is satisfied after 20 seconds from energization of the cooling water pump 13, and if NO, proceeds to step s6, and if YES, Goes to step s13.

In step s6, it is determined whether or not the temperature of the cold / hot water 20 has dropped to 9 ° C. or less.
S) proceeds to step s7, and if the cold / hot water temperature is greater than 9 ° C. (NO), returns to step s4 and returns to 2500 kcal / h
Maintain input at.

In step s7, the controller 9 controls the gas burner 31 based on the output of the cold / hot water sensor 201 so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 7 ° C.
1 input cooling proportional control (1500 kcal / h
４4800 kcal / h).

Further, the tandem pump 80 is controlled at a rotation speed proportional to the HGE temperature (HGE temperature-rotation speed operation line). Further, the cooling tower fan 111 is controlled so that the temperature of the cooling water 10 supplied to the absorber heat transfer tube 14 is maintained at 31.5 ° C.
Control.

It is determined in step s8 whether or not the cooling water temperature ≧ 38 ° C. has elapsed from 20 seconds after the ignition of the cooling water pump 13 to the detection of ignition, and if NO, the process proceeds to step s9. Goes to step s13.

In step s9, it is determined whether or not cold / hot water <5 ° C. or room temperature <set temperature is satisfied (thermo-off, cooling-off). If any of them is satisfied (YES), step s1 is performed.
0, and if none is satisfied (NO), step s
7, the cooling proportional control is continued.

At step s10, an instruction to extinguish the gas burner 311 is issued. In step s11, a cooling-off operation process or a thermo-off operation process, which will be described later, is performed.
Proceed to 12.

[Cooling-off operation process] After extinguishing the gas burner 311 and while the HGE temperature exceeds 100 ° C, the tandem pump 80 is controlled based on the HGE temperature-rotation speed operation line. When the HGE temperature falls below 100 ° C., the rotation speed of the tandem pump 80 is fixed at 900 rpm, the cooling / heating switching valve 36 is opened, and the cooling water pump 13 is stopped. [Thermo-off operation process] When the gas burner 311 extinguishes, the cooling water pump 13 is stopped after 10 seconds.

In step s12, it is determined whether or not cold / hot water ≧ 7 ° C. or more (when cooling is off) or room temperature ≧ set temperature (when thermostat is off). If yes (YES)
Returns to step s3 to perform cooling-off startup or thermo-off startup. In addition, when it does not hold (N
O) returns to step s11 to execute the cooling-off operation process or the thermo-off operation process.

In step s13, it is considered that an abnormality (a decrease in the amount of cooling water, a failure in the cooling tower fan 111, a failure in the cooling water pump 13, etc.) has occurred in the cooling water circuit 1, and the controller 9 instructs an error stop. I do.

In the case of a cold start, step s14
To perform the ignition operation. The cooling / heating switching valve 36 is kept closed.
In step s15, the input is 2500 kcal / h
And start the cooling operation. And HGE temperature ≧ 8
When the temperature reaches 0 ° C., the cooling water pump 13 and the cooling tower fan 11
1 and the timer is started. Furthermore,
When the HGE temperature ≧ 100 ° C., the power supply to the tandem pump 80 is started, and the timer is started.

Step s16: It is determined whether or not the cooling water temperature is ≧ 38 ° C. after 20 seconds from the energization of the cooling water pump 13.
And if NO, proceed to step s17,
In the case of S, the process proceeds to step s21.

At step s17, HGE temperature ≧ 150
It is determined whether or not ℃ or cold and hot water ≦ 11 ° C. is satisfied. If any of them is satisfied (YES), the process proceeds to step s18. If neither is satisfied (NO), the process returns to step s15 to input 2500 kcal / h. To maintain.

At step s18, the input is 4800
kcal / h, and the rotation speed of the tandem pump 80 is also reduced. In step s19, it is determined whether or not the temperature of the cold / hot water 20 has dropped to 9 ° C. or less.
S) proceeds to step s7, and if cold / hot water> 9 ° C. (NO), proceeds to step s20.

Step s20: It is determined whether or not the cooling water temperature is equal to or more than 38 ° C. after 20 seconds from the energization of the cooling water pump 13.
, And in the case of NO, the process returns to step s18 and YE
In the case of S, the process proceeds to step s21.

In step s21, it is considered that an abnormality (a decrease in the amount of cooling water, a failure in the cooling tower fan 111, a failure in the cooling water pump 13, etc.) has occurred in the cooling water circuit 1, and the controller 9 instructs an error stop. I do.

Next, advantages of the absorption type air conditioner A of this embodiment will be described. The absorption type air conditioner A is configured not to perform the error stop based on the cooling water temperature for 20 seconds after the cooling water pump 13 is energized. For this reason, if the cooling water temperature is high at the time of starting the cooling operation {at hot start (including re-operation after cooling off or thermo-off) or when the outside temperature is high}, an unnecessary error may occur when starting (restarting) the cooling operation. The cooling operation can be continued without stopping (malfunction). Therefore, there is no problem that the cooling operation is interrupted even though the room is hot, and the practicability is excellent. Further, when there is an abnormality in the cooling water circuit 1 (a decrease in the amount of cooling water, a failure in the cooling tower fan 111, a failure in the cooling water pump 13, etc.), the error can be stopped reliably, and the crystallization of the absorbing liquid and the High temperature regenerator 3
Deterioration (due to overheating) can be prevented.

The present invention includes the following embodiments in addition to the above embodiment. a. The specific configuration of claim 2 that “the cooling water temperature detecting means is in an operation stop state until the predetermined time elapses” includes, for example, (1) supply of operating power to the cooling water temperature detecting means. A method of stopping, (2) a method of invalidating the sensor output by applying a bias voltage, and the like can be considered.

B. The controller according to claim 1, wherein "even if the cooling water temperature detecting means detects the cooling water temperature equal to or higher than the monitoring temperature, the controller does not instruct an error stop based on the cooling water temperature during the predetermined time at the beginning of the start of the cooling operation." As another configuration,
In addition to the method of the embodiment (performed by software), the sensor output of the cooling water temperature detecting means is output using a relay, a semiconductor element, or the like.
A method of short-circuiting or breaking may be used.

If the method a or b (excluding the interruption of the sensor output) is used, the rotation speed of the cooling tower fan 111 cannot be controlled based on the cooling water temperature. Or a method of fixing at a predetermined value (for a predetermined time) is also used.

C. In the above-described embodiment, the timing at which the controller 9 starts the error stop based on the cooling water temperature is set to 20 seconds after the energization of the cooling water pump 13 and the cooling tower fan 111. good. The cooling water pump 13 and the cooling tower fan 111 do not start operating at the same time, but at a point in time when a predetermined time has elapsed since one of them started operating (corresponding to claims 3 and 4). When a predetermined time has elapsed since the cooling operation switch was turned on (corresponding to claims 1 and 2). When a predetermined time has elapsed from the ignition operation (claims 1 and 2)
Corresponding to).

D. The heating source may be an oil burner or an electric heater in addition to the gas burner. e. Although the above embodiment is an absorption type air conditioner A of a double effect type, it may be of a single effect type.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of an absorption air conditioner according to one embodiment of the present invention.

FIG. 2 is a system diagram of the absorption type air conditioner.

FIG. 3 is an operation explanatory diagram when the absorption type air conditioner is operated for cooling.

FIG. 4 is an operation explanatory diagram when the absorption type air conditioner is operated for heating.

FIG. 5 is a flowchart showing an operation of the absorption type air conditioner during a cooling operation.

FIG. 6 is a flowchart showing an operation of the absorption type air conditioner during a cooling operation.

[Explanation of symbols]

 A Absorption air conditioner 1 Cooling water circuit 2 Cooling / heating water circuit 3 High temperature regenerator 4 Low temperature regenerator 5 Condenser 6 Evaporator 7 Absorber 8 Absorbing liquid circuit 9 Controller 10 Cooling water 11 Cooling tower 13 Cooling water pump 14 Absorber Heat transfer tube 15 Condenser heat transfer tube 20 Cold and hot water 21 Indoor heat exchanger 24 Evaporator heat transfer tube 30 Rare liquid (low concentration absorption liquid) 31 Boiler (heating unit) 34 Medium liquid (medium concentration absorption liquid) 35, 42 Steam refrigerant 41 Concentrated liquid (high concentration absorbing liquid) 91 Cooling water temperature sensor (cooling water temperature detecting means) 111 Outdoor fan 201 Cold / hot water sensor (cooling / hot water temperature detecting means) 211 Blow fan 311 Gas burner (heating source) 801 Solution transfer unit (solution pump) 802 Cold / hot water transfer section (cold / hot water pump)

Claims (4)

[Claims] 1. A cooling water circuit that circulates cooling water by a cooling water pump during cooling operation, comprising a cooling tower provided with a fan, an absorber heat transfer tube, and a condenser heat transfer tube connected in order in a loop, and a blower fan. An indoor heat exchanger and an evaporator heat transfer tube attached are connected in a loop, and a chilled / hot water circuit for circulating chilled / hot water by a chilled / hot water pump. A regenerator that vaporizes the refrigerant in the concentration absorbing liquid and separates it into a high-concentration absorbing liquid and a vapor refrigerant, a condenser in which the condenser heat transfer tube is disposed, and a high-temperature vapor refrigerant is sent from the regenerator during cooling operation, An evaporator for evaporating the liquid refrigerant liquefied in the condenser at a low pressure during the cooling operation, and the absorber heat transfer tube provided adjacent to the evaporator, and the vapor refrigerant evaporated by the evaporator during the cooling operation is supplied to the regenerator. Sent from An absorbent for absorbing the high-concentration absorbent to be absorbed, and an absorbent circuit having a solution pump for returning the absorbent in the absorber to the regenerator; a cooling water temperature detecting means for detecting a temperature of the cooling water; A cooling / heating water temperature detecting unit for detecting a temperature of water; and a control unit for controlling the fan, the cooling water pump, the cooling / heating water pump, the heating source, and the solution pump, and is supplied to the indoor heat exchanger during a cooling operation. A controller that controls the heating power of the heating source so that the temperature of the cold / hot water is maintained at a set temperature, and instructs an error stop when a cooling water temperature equal to or higher than a monitored temperature is detected. In the above, even if the cooling water temperature detection means detects a cooling water temperature equal to or higher than a monitoring temperature, the controller does not instruct an error stop based on the cooling water temperature during the predetermined time at the beginning of the cooling operation. Absorption air conditioning apparatus according to claim 1, wherein. 2. The cooling water temperature detecting means is in an operation stop state until the predetermined time period at the beginning of cooling operation has elapsed, so that the controller cannot instruct an error stop. The absorption type air conditioner as described. 3. The absorption type air conditioner according to claim 1, wherein time measurement of the predetermined time is started by starting the fan. 4. The absorption type air conditioner according to claim 1, wherein timing of the predetermined time is started by starting the cooling water pump.