JP3128502B2 - Absorption air conditioner - Google Patents

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 water circuit in which an outdoor heat exchanger provided with an outdoor fan, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially annularly connected, and a cooling water pump circulates cooling water during cooling operation. A cooling / heating water circuit that circulates cooling / heating water with a cooling / heating water pump, and a cooling / heating water circuit that circulates cooling / heating water with a cooling / heating water pump. Sometimes a regenerator that vaporizes the refrigerant in the low-concentration absorbing liquid to separate it into high-concentration absorbing liquid and vapor refrigerant, and a condenser in which the condenser heat transfer tube is provided and high-temperature vapor refrigerant is sent from the regenerator during cooling operation In a heating operation, a high-temperature absorbing liquid is sent from the regenerator, and in a cooling operation, an evaporator for evaporating a liquid refrigerant liquefied in the condenser is provided. An absorber for absorbing the vapor refrigerant evaporated by the evaporator into the high-concentration absorbent sent from the regenerator, and an absorbent circuit having a solution pump for returning the absorbent in the absorber to the regenerator; Controlling the number of rotations of the outdoor fan so that the temperature of the cooling water supplied to the absorber heat transfer tube is maintained at a predetermined temperature (for example, 31.5 ° C.), and supplying the cooling water to the indoor heat exchanger. The heating power of the heating source is proportionally controlled so that the temperature of the cold and hot water is maintained at a set temperature (for example, 7 ° C.) (for example, 1500 kc).
In recent years, an absorption type air conditioner that does not use Freon, which has a controller and performs cooling and heating of the room by blowing cool air or warm air into the room by the blower fan, has attracted attention in recent years.

In this absorption type air conditioner, in order to prevent overheating,
Abnormal stop when the temperature inside the regenerator exceeds 175 ℃
Cooling / high temperature error stop processing was being performed. When the cooling high temperature error is stopped, it is necessary to turn off the power switch once to cancel the error, and then turn on the cooling operation switch again to restart the cooling operation, which is troublesome.

Incidentally, in this absorption type air conditioner, especially when the cooling operation is started from a cold state (cold start), it takes time for the temperature of each part to reach a steady temperature, and the absorption liquid is circulated. Pressure does not immediately occur, so that the absorbing liquid does not reach the absorber and the absorbing liquid cannot be sent to the regenerator temporarily. high). in this case,
The regenerator temporarily goes into an idle state, and the temperature inside the regenerator becomes 175 ° C. or higher.

[0005] As a result of repeated test operations, the cooling high temperature error stop may be caused by a temporary idle state due to the above-described reasons, or an idle state by other abnormal causes. found.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an absorption type air conditioner capable of reducing the number of cooling high temperature error stops and smoothly starting up a cooling operation.

[0007]

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 for circulating cooling water by a cooling water pump during cooling operation, an indoor heat exchanger, and evaporation. A heat / cooling water circuit in which heat transfer tubes are connected in a loop and a cold / hot water pump circulates cold / hot water, and a regenerator that absorbs the absorption liquid and heats the heating unit by a heating source to vaporize the refrigerant in the absorption liquid during cooling operation A condenser in which high-temperature vapor refrigerant is sent from the regenerator during the cooling operation, and an evaporator that evaporates the liquid refrigerant liquefied by the condenser during the cooling operation; An absorber for arranging the absorber heat transfer tube and absorbing the vapor refrigerant evaporated by the evaporator in the concentrated absorbent sent from the regenerator during cooling operation, and a solution for returning the absorbent in the absorber to the regenerator Pump Absorption air circuit, and a controller for controlling the heating source and the solution pump, wherein the temperature in the regenerator is equal to or higher than a first predetermined temperature, and the rate of temperature rise in the regenerator is If the value is equal to or more than the predetermined value, the controller temporarily stops the operation of the heating source, and then restarts the operation of the heating source.

(2) 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 during cooling operation.
An indoor heat exchanger and an evaporator heat transfer tube are connected in a ring,
A cold and hot water circuit that circulates cold and hot water by a cold and hot water pump,
A high-temperature regenerator in which the absorbing liquid is put and the heating unit is heated by a heating source and vaporizes the refrigerant in the low-concentration absorbing liquid during cooling operation to separate the medium-concentration absorbing liquid and the vapor refrigerant, surrounding the high-temperature regenerator, During the cooling operation, a low-temperature regenerator that separates the medium-concentration absorbing liquid into the high-concentration absorbing liquid and the vapor refrigerant, and the condenser in which the condenser heat transfer tubes are disposed and the high-temperature vapor refrigerant is sent from each regenerator during the cooling operation. An evaporator for evaporating the liquid refrigerant liquefied by the condenser during the cooling operation, and the absorber heat transfer tube provided adjacent to the evaporator are provided. During the cooling operation, the vapor refrigerant evaporated by the evaporator is sent from the low-temperature regenerator. An absorbent for absorbing the high-concentration absorbent, and an absorbent circuit having a solution pump for returning the absorbent in the absorber to the high-temperature regenerator,
In the absorption air conditioner having the controller for controlling the heating source and the solution pump, the temperature in the high-temperature regenerator is equal to or higher than a first predetermined temperature, and the temperature rise rate in the high-temperature regenerator is equal to or higher than a predetermined value. In this case, the controller temporarily stops the operation of the heating source, and then restarts the operation of the heating source.

(3) The configuration according to (1) or (2) above, wherein after restarting the operation of the heating source, the temperature in the regenerator or the high-temperature regenerator is equal to or higher than a first predetermined temperature, and If the temperature rise rate in the regenerator or high-temperature regenerator is more than a predetermined value,
The controller stops operation.

(4) When the temperature in the regenerator or the high-temperature regenerator is equal to or higher than a first predetermined temperature and the temperature rise rate is equal to or higher than a predetermined value, having the configuration of (1) or (2) above. The controller temporarily stops the operation of the heating source until the temperature in the regenerator or the high-temperature regenerator decreases to a second predetermined temperature lower than the first predetermined temperature.

(5) When the temperature in the regenerator or the high-temperature regenerator is equal to or higher than a first predetermined temperature and the temperature rise rate is equal to or higher than a predetermined value, having the configuration of (1) or (2) above. The controller is for a predetermined time set by a pause timer,
The operation of the heating source is temporarily stopped.

(6) It has any one of the above constitutions (1) to (5), and the first predetermined temperature is a temperature in a substantially equilibrium state corresponding to a heating amount of the heating source during a steady operation. .

[0013]

[Action]

[About the cooling operation of claim 1] (Normal operation) The heating source heats the heating unit, and a part of the absorbing liquid put in the regenerator is vaporized to be a vapor refrigerant and sent to the condenser. During the cooling operation, since the cooling water flows through the condenser heat transfer tubes, the vapor refrigerant liquefies and accumulates in the condenser.

During the cooling operation, the liquid refrigerant sent from the condenser into the evaporator is scattered on the evaporator heat transfer tube through which the cold and hot water flows, and takes the heat of vaporization to evaporate and cool the cold and hot water. Then, the cooled cold / hot water passes through the indoor heat exchanger, and indoor cooling is performed. Further, during the cooling operation, the vapor refrigerant evaporated by the evaporator and entering the absorber is absorbed by the high-concentration absorbent sent from the regenerator, and becomes a low-concentration absorbent and accumulates in the absorber. The low-concentration absorbing liquid accumulated in the absorber is returned to the regenerator by the solution pump.

(Circulation failure) At the start of the cooling operation, especially when starting up in a state where the temperature of the absorbent in the regenerator is low and the outside air temperature is low, it takes time for the temperature of each part to reach the steady temperature. If the pressure difference is not sufficient to circulate the absorbing solution, the absorbing solution does not reach the absorber, and a state occurs in which the absorbing solution cannot be temporarily sent to the regenerator. In this case, the regenerator is in an empty cooking state, and the temperature in the regenerator becomes the first
In a state where the temperature is equal to or higher than the predetermined temperature, the temperature in the regenerator increases at a high speed (above a predetermined value).

In this case, the controller temporarily stops the operation of the heating source and waits. During standby, the temperature of each part rises and a sufficient pressure difference is generated to circulate the absorbing liquid, so that the absorbing liquid reaches the absorber and is transferred to the regenerator by the solution pump. When the absorbing liquid accumulates in the regenerator and the empty firing condition is resolved, the operation of the heating source is restarted.

[Cooling Operation of Claim 2] (Normal operation) In the high-temperature regenerator containing the absorbing liquid, the heating section is heated by a heating source. During the cooling operation, the refrigerant in the low-concentration absorbing liquid is vaporized and separated into the medium-concentration absorbing liquid and the vapor refrigerant. During the cooling operation, high-temperature vapor refrigerant is sent from each regenerator to the condenser.

During the cooling operation, the liquid refrigerant sent from the condenser to the evaporator is scattered on the evaporator heat transfer tube through which the cold and hot water flows, takes away heat of vaporization and evaporates to cool the cold and hot water. And
Cooled hot and cold water passes through the indoor heat exchanger, and indoor cooling is performed. Further, during the cooling operation, the vapor refrigerant evaporated by the evaporator and entering the absorber is absorbed by the high-concentration absorbent sent from the low-temperature regenerator and becomes a low-concentration absorbent and is accumulated in the absorber. The low concentration absorbent collected in the absorber is returned to the high temperature regenerator by the solution pump.

(Circulation failure) At the start of the cooling operation, especially when starting up in a state where the temperature of the absorbent in the high-temperature regenerator is low and the outside air temperature is low, it is necessary for the temperature of each part to reach the steady temperature. If it takes time and the pressure difference is not sufficient to circulate the absorbing liquid, the absorbing liquid does not reach the absorber and a state occurs in which the absorbing liquid cannot be temporarily sent to the high-temperature regenerator.
In this case, the high-temperature regenerator is in an empty state, and the temperature in the regenerator or the high-temperature regenerator increases at a high speed (above a predetermined value) while the temperature in the high-temperature regenerator is equal to or higher than the first predetermined temperature.

In this case, the controller temporarily stops the operation of the heating source and waits. During standby, the temperature of each part rises and a sufficient pressure difference is generated to circulate the absorbing liquid, so that the absorbing liquid reaches the absorber and is transferred to the high-temperature regenerator by the solution pump. Absorbent liquid accumulates in the high temperature regenerator,
When the empty firing condition is resolved, the operation of the heating source is restarted.

[Claim 3] If the temperature inside the regenerator or the high-temperature regenerator is higher than the first predetermined temperature and the temperature rises rapidly (above a predetermined value) after restarting the operation of the heating source, Stop operation because of possible overheating.

[Claim 4] At the time of starting the cooling operation, particularly when starting up in a state in which the temperature of the absorbent in the regenerator or the high-temperature regenerator is low and the outside air temperature is low, the temperature of each part becomes the steady temperature. If it takes time to reach and if there is not enough pressure difference to circulate the absorbing liquid, the absorbing liquid will not reach the absorber and the absorbing liquid cannot be temporarily sent to the regenerator or high temperature regenerator A condition occurs. In this case, the regenerator or the high-temperature regenerator is in an empty state, and the temperature in the regenerator or the high-temperature regenerator is higher than the first predetermined temperature, and the speed in the regenerator or the high-temperature regenerator is higher than the first predetermined temperature. The temperature rises.

In this case, the controller temporarily stops the operation of the heating source until the temperature in the regenerator or the high-temperature regenerator falls to a second predetermined temperature lower than the first predetermined temperature. During the suspension, the temperature of each part rises and a sufficient pressure difference is generated to circulate the absorbing liquid, so that the absorbing liquid reaches the absorber and is transferred to the regenerator or high-temperature regenerator by the solution pump. You. When the temperature in the regenerator or the high-temperature regenerator falls to the second predetermined temperature, the absorbing liquid has already been accumulated in the regenerator or the high-temperature regenerator, and since the empty heating state has been eliminated, the controller determines the heating source. Resumes operation.

[Claim 5] At the start of the cooling operation, especially when starting up in a state in which the temperature of the absorbent in the regenerator or the high-temperature regenerator is low and the outside air temperature is low, the temperature of each part is set to the steady temperature. If it takes time to reach and if there is not enough pressure difference to circulate the absorbing liquid, the absorbing liquid will not reach the absorber and the absorbing liquid cannot be temporarily sent to the regenerator or high temperature regenerator A condition occurs. In this case, the regenerator or the high-temperature regenerator is in an empty state, and the temperature in the regenerator or the high-temperature regenerator is higher than the first predetermined temperature, and the speed in the regenerator or the high-temperature regenerator is higher than the first predetermined temperature. The temperature rises.

In this case, the controller temporarily stops the operation of the heating source for a predetermined time set by the pause timer. During the suspension, the temperature of each part rises and a sufficient pressure difference is generated to circulate the absorbing liquid, so that the absorbing liquid reaches the absorber and is transferred to the regenerator or high-temperature regenerator by the solution pump. You. When the suspension timer expires, the controller resumes the operation of the heating source because the absorbing liquid has already been accumulated in the regenerator or the high-temperature regenerator, and the state of empty heating has been eliminated.

[Claim 6] The first predetermined temperature at which the operation of the heating source is temporarily stopped is set to a temperature in a substantially equilibrium state corresponding to the heating amount of the heating source during steady operation.

[0027]

【The invention's effect】

[Claim 1] At the start-up of the cooling operation, when the temperature of the regenerator is equal to or higher than the first predetermined temperature and the rate of temperature rise in the regenerator is equal to or higher than a predetermined value, it is regarded as an idling state, The controller temporarily stops the operation of the heating source. As a result, the temperature rise in the regenerator is temporarily stopped, so that the cooling high temperature error stop can be avoided and the cooling operation can be started smoothly.

[Claim 2] At the start of the cooling operation, if the temperature of the high-temperature regenerator is equal to or higher than the first predetermined temperature and the temperature rising rate in the high-temperature regenerator is equal to or higher than a predetermined value, the idle heating is performed. This is a configuration in which the controller temporarily stops the operation of the heating source, considering the state. As a result, the temperature rise in the high-temperature regenerator is temporarily stopped, so that the cooling high-temperature error stop can be avoided, and the cooling operation can be started up smoothly.

[Claim 3] After the operation of the heating source is resumed, if the temperature in the regenerator or the high-temperature regenerator is equal to or higher than the first predetermined temperature and the temperature rise rate in the regenerator or the high-temperature regenerator is increased to a predetermined value. In the above case, since the controller stops the operation, overheating of the regenerator or the high-temperature regenerator due to other causes can be prevented.

[Claim 4] At the start of the cooling operation, when the temperature of the regenerator or the high-temperature regenerator is equal to or higher than the first predetermined temperature and the temperature rise rate in the regenerator or the high-temperature regenerator is equal to or higher than a predetermined value. In such a case, the controller is considered to be in the idling state, and the controller temporarily stops the operation of the heating source until the temperature in the regenerator or the high-temperature regenerator falls to the second predetermined temperature. As a result, the temperature rise in the regenerator or the high-temperature regenerator temporarily stops, so that the cooling high-temperature error stop can be avoided,
It is possible to smoothly start up the cooling operation.

[Claim 5] In the start-up of the cooling operation, when the temperature of the regenerator or the high-temperature regenerator is equal to or higher than the first predetermined temperature and the temperature rise rate in the regenerator or the high-temperature regenerator is equal to or higher than a predetermined value. In this case, the controller is configured to temporarily stop the operation of the heating source for a predetermined time set by the pause timer, assuming that the heating source is in the idling state. This allows
Since the temperature rise in the regenerator or the high-temperature regenerator is temporarily stopped, it is possible to avoid the stop of the cooling / high-temperature error and to smoothly start the cooling operation.

[Claim 6] The first predetermined temperature is set to a temperature in a substantially equilibrium state corresponding to a heating amount of the heating source during a steady operation, and the temperature in the regenerator or the high-temperature regenerator is set to the first predetermined temperature. As described above, when the temperature rising speed is equal to or higher than the predetermined value, the configuration is considered to be the idle firing state, so that the idle firing state can be reliably detected.

[0033]

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

The cooling water circuit 1 includes a cooling tower 11 (outdoor heat exchanger) provided with a cooling tower fan 111 and a cooling water tank 1.
2, a cooling water pump 13, an absorber heat transfer tube 14, and a condenser heat transfer tube 15 are sequentially connected in a ring shape. During cooling operation, the cooling water pump 13 (1230 liter / h) is operated to cool the cooling water 10. Circulate.

The cooling tower fan 111 is driven by an AC condenser motor 112. The AC condenser motor 112 is connected to an AC-capacitor via a triac (not shown).
The controller 9 controls the rotation speed so that the cooling water temperature detected by the cooling water temperature sensor 91 is maintained at 31.5 ° C.

The cooling water temperature sensor 91 is provided 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, the cooling water circuit 1
All of the cooling water 10 inside is removed, and the AC condenser motor 1
12 is not energized.

The cold / hot water circuit 2 is formed by connecting an indoor heat exchanger 21, a cistern 22, a cold / hot water pump 23 (at a maximum capacity of 620 liter / h) and an evaporator heat transfer tube 24 with a blower fan 211 in an annular manner. The cold / hot water 20 is circulated by a cold / hot water pump 23. 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 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 (hereinafter referred to as diluted solution 30)
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.

The gas burner 311 is of a Bunsen type,
Gas is supplied by a gas pipe 315 having gas solenoid valves 312 and 313 and a gas proportional valve 314 connected thereto.
The combustion air is supplied by 16 and burns. 321 is a gap for heat insulation. In addition, an HGE temperature sensor 301 for detecting the temperature of the high-temperature regenerator 3 (the temperature of the dilute solution 30) is provided at an appropriate position of the evaporator 31.

The cold / hot water sensor 201 is connected to the indoor heat exchanger 21
Is disposed in the cold / hot water pipe 29 on the inlet side of the indoor heat exchanger 2.
The temperature of the cold / hot water 20 supplied to 1 is detected.

During the cooling operation, the controller 9 controls the temperature (average temperature) of the cold / hot water 20 detected by the cold / hot water sensor 201 to 7
The input of the gas burner 311 is proportionally controlled (cooling proportional control) between 1500 kcal and 4800 kcal so that the temperature becomes ° C. During turbo cooling operation, the input is set to 6500 kcal.

During the heating operation, the controller 9 performs proportional control (heating) on the input of the gas burner 311 between 1500 kcal and 8000 kcal so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 60 ° C. Proportional control)
I do.

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 of the high-temperature regenerator 3, and during cooling operation, the intermediate liquid 34 receives heat from the collection container 33 and is heated. As a result, a part of the middle liquid 34 is vaporized and becomes a high concentration absorbing liquid (hereinafter, referred to as a concentrated liquid 41; 6).
(2% lithium bromide aqueous solution) and a vapor refrigerant 42. Further, during the heating operation in which the cooling / heating switching valve 36 is opened, since the flow path resistance is generated in the intermediate liquid pipe 344 by the orifice 343, the entire intermediate liquid 34 flows into the heating pipe 361 and is not sent to the low-temperature regenerator 4.

The 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 through the coil-shaped condenser heat transfer tubes 15. Liquid refrigerant (water) cooled by water 10
52 accumulates at the bottom of the condenser 5. In addition, temperature rise (37.5)
The cooling water 10 cooled in the cooling tower 11 (31.5 ° C.).
° C).

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 absorbing liquid in the separation tower 32 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
→ refrigerant valve 54 → sprayed on the evaporator heat transfer tube 24 via the sprayer 55, and the inside of the evaporator 6 is substantially vacuum (about 6.5 mmHg)
Therefore, 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 is supplied to the indoor heat exchanger 21 disposed indoors.
Heat exchange with the air blown indoors at the maximum capacity (heat absorption 4
000 kcal / h), and the temperature was raised.
Is again cooled through the evaporator heat transfer tube 24.

The absorber 7 provided with the absorber heat transfer tube 14 is
The upper part is connected to the evaporator 6 and communicates with the evaporator 6.
Then, during the cooling operation, the vapor refrigerant evaporated in the evaporator 6 enters the absorber 7 from above, and the low-temperature regenerator 4 → the concentrated liquid pipe 411 → the low-temperature heat exchange channel 412 → the concentrated liquid pipe 413 → the sprayer 70 The diluted liquid 30 which has been absorbed by the concentrated liquid 41 scattered on the absorber heat transfer tube 14 and has become low in 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 solution pump 80 is a three-phase DC brushless motor operating at AC-100V, and has a Hall element (not shown). This solution pump 80
Is controlled based on the HGE temperature-rotation speed characteristic. Incidentally, the cold / hot water pump 23 and the solution pump 80 may be constituted by one tandem pump.

The diluted liquid 30 (absorbed liquid during the heating operation) accumulated at the bottom of the absorber 7 is diluted with a diluted liquid pipe 71 → a solution pump 80 →
Rare liquid pipe 72 → Low temperature / high temperature heat exchange channel 73 → Rare liquid pipe 7
It is sent to the boiler 31 of the high temperature regenerator 3 via 4.

The controller 9 includes an operation switch (not shown),
Each water level sensor, H for detecting the temperature of the absorbing solution in the boiler 31
The GE temperature sensor 301, the cold / hot water sensor 201 for detecting the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21, the EVA temperature sensor 61 for detecting the internal temperature of the evaporator 6, and the absorber heat transfer tube 14 The following is controlled based on a signal from a cooling water temperature sensor 91 that detects the temperature of the cooling water 10.

Water supply valve 221, gas solenoid valves 312, 31
3, gas proportional valve 314, solution pump 80, cooling water pump 13, cooling tower fan 111, refrigerant valve 54, cooling / heating switching valve 3
6, cold / hot water pump 23.

During the cooling operation or the heating operation, the absorption air conditioner A operates as follows. In the high-temperature regenerator 3 containing the absorbing liquid, the boiler 31 is heated by the gas burner 311. During the cooling operation, the refrigerant in the diluted liquid 30 is vaporized and separated into the intermediate liquid 34 and the vapor refrigerant 35. During cooling operation (Fig. 4
), 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 onto 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
And is collected in the absorber 7 as a dilute liquid 30 and returned to the boiler 31 of the high-temperature regenerator 3 by the solution pump 80.

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 passes through the indoor heat exchanger 21 and is blown by the blower fan 211. Cooling air is blown into the room to perform indoor cooling. At this time, the indoor controller 25 controls 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).

During the cooling operation, the controller 9 controls the input of the gas burner 311 so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 7 ° C. In the case of the heating operation, the high-temperature absorbent is sent from the high-temperature regenerator 3 to the evaporator 6 through the heating pipe 361, and the absorbent heats the cold and hot water 20 flowing through the evaporator heat transfer pipe 24, 6
The absorbing liquid inside enters the absorber 7 and accumulates in the absorber 7. Note that the collected absorbent is returned to the high-temperature regenerator 3 by the solution pump 80.

Cold and hot water 2 heated and heated by the absorbing solution
0 passes through the indoor heat exchanger 21 and warm air is blown into the room by the blower fan 211 to perform indoor heating. At this time, the controller 9 controls the gas burner 31 so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 60 ° C.
One input (1500-8000 kcal) is controlled. Further, the indoor controller 25 controls the flow control valve 27 and the blower fan 211 such 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).

Next, a mechanism for smoothly starting the cooling operation will be described with reference to the flowchart of FIG.
When the user turns on the cooling operation switch (not shown),
The controller 9 and the indoor controller 25 start control according to a predetermined procedure.

Cold cooling start: Y in step s1
ES; HGE ≦ 50 ° C .; HGE is a cooling tower process for opening the water supply valve 221 and storing water in the cistern 22 when the temperature detected by the temperature sensor 301 is｝ (CT process)
Is performed in step s2 (the required time is about 1 minute), and the process proceeds to step s3.

Hot cooling start (N in step s1)
O; HGE> 50 ° C.), the water supply valve 221 is opened, and a cooling tower process (CT process) for storing water in the cistern 22 is performed in step s11 (the required time is about 1 hour).
Minute), and proceeds to step s12.

In step s3, the solution pump is set to 2400 rpm
m, the ignition operation is performed in step s4, and the gas burner 311 starts combustion. In step s5, the following cold start control (hot start control for the second time) is performed, and when the cooling operation is stabilized, the process proceeds to cooling proportional control.

(Cold start control) HGE <60 ° C.
During the period, the input is set to 3500 kcal. When cold / hot water> 11 ° C. and 60 ° C. ≦ HGE <150 ° C., the turbo cooling operation is started and the input is set to 6500 kcal. At 80 ° C. ≦ HGE, the solution pump 80 is controlled at a rotation speed proportional to the input. 10 ℃ <cold / hot water ≦ 11
° C, HGE ≧ 150 ° C, input 4800k
drop to cal. When the cooling operation is stabilized and the temperature of the cooling water becomes ≦ 10 ° C. (however, HGE ≧ 150 ° C.), the process shifts to the cooling proportional control.

(Hot start control) Input is set to 4800 kcal with cold / hot water at 10 ° C. Cooling operation is stable, and cold / hot water ≤ 10 ° C (however, HGE ≥ 150 ° C)
Then, the process proceeds to the cooling proportional control.

(Cooling proportional control) 1500 kcal to 4800 so that the temperature (average temperature) of the cold / hot water 20 becomes 7 ° C.
During kcal, the input of the gas burner 311 is proportionally controlled (cooling proportional control).

During the control of step s5, the condition of step s6 (HGE ≧ 160 ° C., 2 ° C. or more in 3 seconds,
When HGE temperature rises) (Step s)
(YES in 6) proceeds to step s7, and if not satisfied (NO in step s6), returns to step s5 to continue cold start control (hot start control for the second time) or cooling proportional control.

If the condition of step s6 is satisfied for the second time (YES in step s7), the cooling high temperature error processing is performed, and then the cooling high temperature error is stopped. If the condition in step s6 is satisfied for the first time (NO in step s7), the process proceeds to step s8. In step s8, the controller 9 instructs the fire extinguishing of the gas burner 311. In step s9, the controller 9 sets the solution pump 80
Operation (rotational speed proportional to the input) is continued.

In step s10, it is determined whether or not HGE ≦ 150 ° C. If HGE> 150 ° C., the flow returns to step s9 and the fire extinguishing state is continued. In addition, the temperature of each part rises during the loop of step s9 → NO in step s10 → step s9, and a sufficient pressure difference for circulating the absorbing liquid is generated, so that the absorbing liquid reaches the absorber 7.
When HGE ≦ 150 ° C., return to step s4,
Perform the ignition operation.

On the other hand, in the case of the start of hot cooling, the ignition operation is performed in step s12, and the gas burner 311 starts combustion. In step s13, the above-described hot start control is performed, and when the cooling operation is stabilized, the process proceeds to the above-described cooling proportional control.

Next, advantages of the absorption type air conditioner A of this embodiment will be described. [A] Absorption type air conditioner A has HGE ≧ 16 when cold start of cooling operation at HGE ≦ 50 ° C.
0 ° C. and the HGE temperature rises rapidly (2 ° C. in 3 seconds)
In the above case, the circulation of the gas burner 311 is temporarily stopped until HGE ≦ 150 ° C., assuming that the circulation is defective due to the cold start.

As a result, when the absorption liquid is not sent into the high-temperature regenerator 3 due to a circulation failure, the heating is stopped, so that the temperature in the high-temperature regenerator 3 does not rise and the gas burner 31
The absorption liquid returns into the absorber 7 during the stop of the combustion of 1, and the heating is restarted, so that the cooling high temperature error stop can be avoided and the cold start of the cooling operation can be smoothly performed. It is particularly effective in the case of a cold start of the cooling operation when the outside air temperature at which the temperature of each part does not easily reach a steady state early is low.

[A] Absorption type air conditioner A is a gas burner 3
When the HGE temperature rises rapidly (2 ° C. or more in 3 seconds) in the state of HGE ≧ 160 ° C. after the reburning of No. 11, the cooling high temperature error stop (operation stop) is performed. For this reason, overheating of the high-temperature regenerator 3 due to other causes can be reliably detected (since only one empty firing occurs due to cold start), and in the case of overheating of the high-temperature regenerator 3 due to other causes, combustion occurs. The operation of the absorption air conditioner A can be safely stopped without repeating the start / stop of the operation.

[C] Heating amount during steady operation (input)
The temperature in the equilibrium state corresponding to the above, that is, the first predetermined temperature is set to 160 ° C., and the second predetermined temperature is set to 150 ° C., which is slightly lower than 160 ° C.
Since it is assumed that the temperature is 2 ° C. or more in 3 seconds, the accuracy of determining the state of the empty firing accompanying the cold start is excellent. In addition, the time when the state of the empty firing is canceled and the absorbing liquid returns to the absorber 7 (150)
C), the gas burner 311 can be re-burned, and the cool air can be blown early.

The present invention includes the following embodiments in addition to the above embodiment. a. In the above embodiment, the absorbent circuit 8 is provided with a regenerator and a condenser heat transfer tube in which the absorbent is filled and the heating unit is heated by the heating source, and a high-temperature vapor refrigerant is sent from the regenerator during the cooling operation. A condenser, an evaporator for evaporating the liquid refrigerant liquefied by the condenser during cooling operation, and an absorber heat transfer tube provided in parallel with the evaporator, and the regenerator for evaporating the vapor refrigerant evaporated by the evaporator during cooling operation. And a solution pump for returning the absorbing solution in the absorber to the regenerator. As described above, when the absorption liquid circuit 8 has a single effect, the cooling / heating efficiency is lower than that of the double effect (absorption air conditioner A), but the structure of the absorption air conditioner can be simplified.

B. The second predetermined temperature is the second predetermined temperature <the first temperature
As long as it is a predetermined temperature, another temperature may be used. c. In the above embodiment, also in the case of the hot start of HGE> 50 ° C., as in the case of the cold start, ΔHGE ≧ 16
0 ° C. and the HGE temperature rises rapidly (2 ° C. in 3 seconds)
In the above case, it is considered that the circulation is poor, and HGE ≦ 150.
The configuration of (1) in which the combustion of the gas burner 311 is temporarily stopped until the temperature drops to ° C may be adopted.

D. The heating source may be an electric heater or the like in addition to the gas burner. e. The temporary heating stop may be performed for a predetermined time set by a temporary timer (corresponding to claim 5).

[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 heating.

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

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

[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 (outdoor heat exchanger) 13 Cooling water pump 14 Absorber heat transfer tube 15 Condenser heat transfer tube 20 Cold and hot water 21 Indoor heat exchanger 23 Cold and hot water pump 24 Evaporator heat transfer tube 30 Rare liquid (low-concentration absorbing liquid) 31 Boiler (heating unit) 34 Medium liquid ( Medium concentration absorbing liquid) 35, 42 Steam refrigerant 41 Concentrated liquid (high concentration absorbing liquid) 80 Solution pump 111 Cooling tower fan (outdoor fan) 211 Blowing fan 311 Gas burner (heating source)

Continuation of the front page (72) Inventor Kaoru Kawamoto 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi Inside Osaka Gas Co., Ltd. (56) References JP-A-3-134442 (JP, A) JP-A-3-3 194368 (JP, A) JP-A-8-29000 (JP, A) JP-A-9-133426 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 15/00 306

Claims (6)

(57) [Claims] An indoor heat exchanger comprising: an outdoor heat exchanger, an absorber heat transfer tube, and a condenser heat transfer tube, which are sequentially connected in a ring shape, and a cooling water circuit that circulates cooling water by a cooling water pump during a cooling operation; And the evaporator heat transfer tubes are connected in a ring,
A chilled / hot water circuit for circulating chilled / hot water by a chilled / hot water pump, a regenerator containing the absorbing liquid, heating the heating unit by a heating source, and evaporating the refrigerant in the absorbing liquid during cooling operation, and the condenser heat transfer tube are provided. During cooling operation, a condenser into which high-temperature vapor refrigerant is sent from the regenerator, during cooling operation, an evaporator for evaporating the liquid refrigerant liquefied by the condenser, and the absorber heat transfer tube provided alongside the evaporator is provided. During operation, an absorber for absorbing the vapor refrigerant evaporated by the evaporator into the concentrated absorption liquid sent from the regenerator, and an absorption liquid circuit having a solution pump for returning the absorption liquid in the absorber to the regenerator; A source and a controller for controlling the solution pump, wherein the temperature in the regenerator is equal to or higher than a first predetermined temperature, and the temperature rise rate in the regenerator is equal to or higher than a predetermined value, Your vessel, the operation of the heating source temporarily stopped, then, the absorption air conditioning apparatus, characterized in that to resume the operation of the heating source. 2. An indoor heat exchanger comprising: an outdoor heat exchanger, an absorber heat transfer tube, and a condenser heat transfer tube, which are sequentially connected in a ring shape, and a cooling water circuit that circulates cooling water by a cooling water pump during a cooling operation; And the evaporator heat transfer tubes are connected in a ring,
A chilled / hot water circuit that circulates chilled / hot water with a chilled / hot water pump; A high-temperature regenerator to be separated, a high-temperature regenerator surrounding the high-temperature regenerator, and a low-temperature regenerator that separates the medium-concentration absorbent into a high-concentration absorbent and a vapor refrigerant during cooling operation, A condenser into which high-temperature vapor refrigerant is sent from each regenerator, an evaporator for evaporating the liquid refrigerant liquefied in the condenser during cooling operation, and an absorber heat transfer tube provided in conjunction with the evaporator, and An absorber for absorbing the vapor refrigerant evaporated in the evaporator into the high-concentration absorbent sent from the low-temperature regenerator; and an absorbent circuit having a solution pump for returning the absorbent in the absorber to the high-temperature regenerator; Source and A controller for controlling the solution pump, wherein when the temperature in the high-temperature regenerator is equal to or higher than a first predetermined temperature and the temperature rise rate in the high-temperature regenerator is equal to or higher than a predetermined value, the control is performed. An air conditioner for temporarily stopping the operation of the heating source, and thereafter resuming the operation of the heating source. 3. After the operation of the heating source is restarted, the temperature in the regenerator or the high-temperature regenerator is equal to or higher than a first predetermined temperature, and
The absorption air conditioner according to claim 1 or 2, wherein the controller stops the operation when a temperature rise rate in the regenerator or the high-temperature regenerator is equal to or higher than a predetermined value. 4. The absorption air conditioner according to claim 1, wherein the temperature in the regenerator or the high-temperature regenerator is equal to or higher than a first predetermined temperature, and the temperature rise rate is equal to or higher than a predetermined value. In this case, the controller temporarily stops the operation of the heating source until the temperature in the regenerator or the high-temperature regenerator falls to a second predetermined temperature lower than the first predetermined temperature. Absorption air conditioner. 5. The absorption type air conditioner according to claim 1, wherein the temperature in the regenerator or the high-temperature regenerator is equal to or higher than a first predetermined temperature, and the temperature rise rate is equal to or higher than a predetermined value. In such a case, the controller temporarily stops the operation of the heating source for a predetermined time set by a pause timer. 6. The absorption air conditioner according to claim 1, wherein the first predetermined temperature is a temperature in a substantially equilibrium state corresponding to a heating amount of the heating source during a steady operation. Absorption type air conditioner characterized by a certain thing.