JP3128501B2 - 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. An indoor heat exchanger equipped with a blower fan and an evaporator heat transfer tube are connected in a loop, and a cold / hot water circuit that circulates cold / hot water by a cold / hot water pump, and an absorbing liquid is put in and the heating unit is heated by a gas burner and cooling operation is performed. A high-temperature regenerator that vaporizes the refrigerant in the low-concentration absorbent and separates it into a medium-concentration absorbent and a vapor refrigerant, surrounds the high-temperature regenerator and converts the medium-concentration absorbent into a high-concentration absorbent and a vapor refrigerant during cooling operation. A low-temperature regenerator that separates the condenser and the condenser heat transfer tube is provided and a condenser in which a high-temperature vapor refrigerant is sent from each regenerator in a cooling operation, and a high-temperature absorbent is sent from the high-temperature regenerator in a heating operation to cool. An evaporator that evaporates the liquid refrigerant liquefied by the condenser during the operation, and the absorber heat transfer tube is provided in parallel with the evaporator, and the vapor refrigerant evaporated by the evaporator is sent from the low-temperature regenerator during the cooling operation. An absorber for absorbing the high-concentration absorbent, an absorbent circuit having a solution pump for returning the absorbent in the absorber to the high-temperature regenerator, and a temperature of cold and hot water supplied to the indoor heat exchanger during a heating operation. The input of the gas burner is proportionally controlled (for example, 1500 kca) so as to be maintained at a predetermined temperature (for example, 60 ° C.).
1 / h to 8000 kcal / h), during the cooling operation, the input of the gas burner is proportionally controlled (for example, 1500 kcal) so that the temperature of the cold and hot water supplied to the indoor heat exchanger is maintained at a predetermined temperature (for example, 7 ° C.). / H ~ 4800
kcal / h), and performs indoor cooling and heating by blowing cool air or hot air into the room by the blower fan.
In recent years, an absorption-type air conditioner that does not use Freon has attracted attention (see FIG. 7).

[0003] In this absorption type air conditioner, since the temperature of the components such as the burner port of the gas burner is low at the start of operation and the combustion air is easy to flow, if the same proportional control as in the steady combustion is performed, air-rich And the combustion becomes unstable. In addition, the proportional control is controlled according to the temperature of the cold and hot water, but since the temperature of the cold and hot water and the temperature of the absorbent at the start of the operation do not correspond to each other, the absorbent in the high-temperature regenerator is overheated. There is a possibility that the problem described above may occur. For this reason, it is conceivable that the input of the gas burner at the start of operation is fixed to, for example, the middle point (4000 kcal) of the combustion capacity range until the operation is stabilized, in addition to the proportional control at the time of steady combustion.

[0004]

As a result of conducting various tests, the inventors have found that the absorption type air conditioner has the following problems. At the time of initial operation, or when a long time has elapsed since the stoppage of the operation, and when the absorption liquid in the high-temperature regenerator is started up in a cold state (hereinafter referred to as a cold state), the cooling / heating capacity (cool air,
It takes a long time for hot air to come out.

If the absorption liquid in the high-temperature regenerator is started in a hot state (hereinafter, referred to as a hot state) immediately after the operation stop such as cooling-off, heating-off, and start-up from the thermo-off, the high-temperature regenerator The temperature of the absorbing solution (HGE temperature) becomes too high, and the high temperature error is likely to stop. [Cooling off, heating off, thermo off] and [cooling off startup, heating off startup, thermo off startup] are repeated many times, and the process does not shift to cooling proportional control.

An object of the present invention is to prevent the absorption liquid from being overheated when starting up from a hot state, and to set up a start-up time (time until cooling / heating capability is achieved) when starting up from a cold state. It is an object of the present invention to provide an absorption type air conditioner which can shorten the time.

[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 that circulates cooling water by a cooling water pump during a cooling operation, and an indoor heat provided with a blower fan. A cooler / hot water circuit in which an exchanger and an evaporator heat transfer tube are connected in a ring, and a chiller / heater pump circulates chilled / hot water; a regenerator in which an absorbing liquid is filled and a heating unit is heated by a heating source; A condenser in which a high-temperature vapor refrigerant is fed from the regenerator, in which a heat pipe is disposed, a high-temperature absorbing liquid is sent during a heating operation, and an evaporator that evaporates a liquid refrigerant liquefied by the condenser during a cooling operation during a cooling operation. An absorber that is provided in parallel with the absorber heat transfer tube and absorbs the vapor refrigerant evaporated by the evaporator in a concentrated absorbent sent from the regenerator during cooling operation, and the regenerator absorbs the absorbent in the absorber. Solution to return to An absorption liquid circuit having a pump, and a controller for controlling a heating power of the heating source so that the cold and hot water maintains a predetermined temperature, and blows cold or warm air into the room by the blower fan, and Performing cooling and heating, in the absorption air conditioner, when the temperature of the absorbent in the regenerator is the operation start-up from a low temperature state, the heating power of the heating source is fixed to a large value until the operation is stabilized, When the operation is started from a high temperature state, the heating power of the heating source is fixed at a small value until the operation is stabilized.

(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 equipped with a blower fan and an evaporator heat transfer tube are connected in a loop, and a cold / hot water circuit for circulating cold / hot water by a cold / hot water pump, and an absorbing liquid is put into the heating unit and the heating unit is heated by a heating source to cool. During operation, a high-temperature regenerator that evaporates the refrigerant in the low-concentration absorbent and separates it into medium-concentration liquid and vapor refrigerant, surrounds the high-temperature regenerator and cools the medium-concentration liquid with high-concentration absorbent and vapor during cooling operation. A low-temperature regenerator that separates the refrigerant from the refrigerant, a condenser in which the condenser heat transfer tubes are provided and a high-temperature vapor refrigerant is sent from each regenerator during cooling operation, and a high-temperature absorbing liquid is sent from the high-temperature regenerator during heating 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. Is Absorber to absorb a high concentration absorption solution,
An absorption liquid circuit having a solution pump for returning the absorption liquid in the absorber to the high temperature regenerator, and a controller for controlling the heating power of the heating source so that the cold and hot water maintains a predetermined temperature. In the case of an absorption type air conditioner, in which cooling air or warm air is blown into a room by the blower fan to perform indoor cooling and heating, and when the temperature of the absorbing liquid in the high-temperature regenerator starts operation from a low temperature state, The heating power of the heating source is fixed at a large value until the operation is stabilized, and when the operation is started from a high temperature state, the heating power of the heating source is fixed at a small value until the operation is stabilized.

[0009]

[Action]

[Claim 1] A heating section of a regenerator containing an absorbing liquid is heated by a heating source (at the time of cooling / heating operation).
In the case of a cold state (at the time of initial operation or a state in which the absorbent in the regenerator has been cooled after a long time has elapsed since the operation was stopped), when starting up, the heating power of the heating source should be reduced until the operation becomes stable. The temperature of the absorbing solution in the regenerator is quickly raised by fixing the temperature to a large value.

In a hot state (starting operation after a temporary stoppage, or a state in which the absorption liquid in the regenerator is hot after a short time has passed since the stoppage of the operation), the operation is stabilized at the start-up. The heating power of the heating source is fixed to a small value to prevent overheating of the regenerator.

During the cooling operation, high-temperature vapor refrigerant is sent from the regenerator into the condenser, and liquefies because the cooling water is flowing through the condenser heat transfer tube, and accumulates in the condenser. The liquid refrigerant sent from the condenser into the evaporator is scattered on the evaporator heat transfer pipe 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 cooling water pump, passes through the indoor heat exchanger, and the blowing fan blows cool air into the room, thereby performing indoor cooling.

During the heating operation, a high-temperature absorbing liquid from the regenerator is fed into the evaporator. Thereby, the cold / hot water flowing through the evaporator heat transfer tube is heated. Then, the heated and cooled water is supplied to the indoor heat exchanger by the cold and hot water pump, passes through the indoor heat exchanger, and the blowing fan blows warm air into the room, thereby performing indoor heating.

During the cooling operation, the vapor refrigerant evaporated by the evaporator and entering the absorber is absorbed by the concentrated absorbing solution sent from the regenerator, and becomes a diluted absorbing solution and accumulates in the absorber. During the heating operation, the absorbent in the evaporator enters the absorber and accumulates in the absorber.

The absorbent collected in the absorber is returned to the regenerator by the solution pump (at the time of cooling / heating operation). When the cooling operation / heating operation becomes stable, the controller proportionally controls the heating power of the heating source so that the cold / hot water maintains a predetermined temperature (at the time of cooling / heating operation).

[Claim 2] In the high-temperature regenerator containing the absorbing liquid, the heating section is heated by a heating source (during cooling / heating operation). In the case of a cold state (when the absorption liquid in the high-temperature regenerator is cooled after a long time has elapsed since the first operation, or after the operation was stopped), the heating power of the heating source was stabilized at startup when the operation was stabilized. To quickly increase the temperature of the absorbing solution in the high-temperature regenerator.

In a hot state (operation start-up after a temporary operation stop, or a state in which the absorption liquid in the high-temperature regenerator is hot after a short time has elapsed since the operation stop), the operation is stable at the start-up. Until the heating, the heating power of the heating source is fixed to a small value to prevent the high temperature regenerator from overheating.

During the cooling operation, the refrigerant of the low-concentration absorbing liquid contained in the high-temperature regenerator evaporates, and is separated into a medium-concentration absorbing liquid and a high-temperature vapor refrigerant, and the medium-concentration absorbing liquid is sent to the low-temperature regenerator. It is. During the cooling operation, high-temperature vapor refrigerant is sent from each 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. During the heating operation, the high-temperature absorbent is sent into the evaporator from the high-temperature regenerator. Thereby, the cold / hot water flowing through the evaporator heat transfer tube is heated.

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, takes away the 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, passes through the indoor heat exchanger, and the blowing fan blows cool air into the room, thereby performing indoor cooling. or,
During the heating operation, the heated hot and cold water is supplied to the indoor heat exchanger by the cold and hot water pump, passes through the indoor heat exchanger, and the blower fan blows warm air into the room to perform room heating.

During the cooling operation, the vapor refrigerant evaporated in the evaporator and entering the absorber is absorbed by the high-concentration absorbent sent from the high-temperature regenerator and becomes a low-concentration absorbent and accumulates in the absorber.
During the heating operation, the absorbent in the evaporator enters the absorber and accumulates in the absorber. The absorbent collected in the absorber is returned to the high-temperature regenerator by the solution pump (at the time of cooling / heating operation). When the cooling operation / heating operation becomes stable, the controller proportionally controls the heating power of the heating source so that the cold / hot water maintains a predetermined temperature (at the time of cooling / heating operation).

[0020]

【The invention's effect】

[Claim 1] In the cold state, at the time of startup, the heating power of the heating source is fixed to a large value until the operation becomes stable, so that the temperature of the absorbing solution in the regenerator rises quickly, During operation, generation of the concentrated absorption liquid and generation of the liquid refrigerant are promoted. For this reason, the cooling of the hot and cold water by evaporation of the liquid refrigerant in the evaporator and the absorption of the vapor refrigerant in the absorber are quickly performed, and the heating of the cold and hot water in the evaporator during the heating operation. It is performed quickly and can blow out cold or warm air into the room early. Therefore, the absorption type air conditioner of this configuration is
In the startup from the cold state, the heating power can be shortened, for example, the time until the cooling / heating capacity is increased, as compared with an absorption air conditioner fixed at an intermediate point.

In the hot state, the heating power of the heating source is fixed to a small value at startup and until the operation becomes stable, so that the absorbing liquid in the regenerator is not overheated. For this reason, when starting up from the hot state, heating loss does not occur, and an unstable operation state due to repetition of starting up from the off state, such as cooling off and heating off, can be prevented.

[Claim 2] In the cold state, the heating power of the heating source is largely fixed at the time of startup until the operation is stabilized, so that the temperature of the absorbing liquid in the high-temperature regenerator rapidly increases. During the cooling operation, the generation of the medium / high concentration absorbing liquid and the generation of the liquid refrigerant are promoted. For this reason, the cooling of the hot and cold water by the evaporation of the liquid refrigerant in the evaporator and the absorption of the vapor refrigerant in the absorber are performed quickly, and the overheating of the cold and hot water in the evaporator during the heating operation. It is performed quickly and can blow out cold or warm air into the room early. Therefore, in the startup of the absorption type air conditioner of the present configuration, when starting from the cold state, it is possible to shorten the time until the cooling / heating capacity is increased as compared with the absorption type air conditioner in which the heating power is fixed to, for example, the middle point.

In the hot state, the absorption liquid in the high-temperature regenerator is not overheated because the heating power of the heating source is fixed to a small value at startup when the operation is stabilized. For this reason, when starting up from the hot state, heating loss does not occur, and an unstable operation state due to repetition of starting up from the off state, such as cooling off and heating off, can be prevented.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention (corresponding to claim 2) will be described with reference to FIGS. As shown in the figure, an absorption type air conditioner A has a cooling water circuit 1 for circulating cooling water 10 during cooling operation, and a cooling / heating water 2 during cooling / heating operation.
A hot / cold water circuit 2 for circulating 0, a high temperature regenerator 3, a low temperature regenerator 4, a condenser 5, an evaporator 6, an absorber 7, and a solution pump section 801 of a tandem pump 80. , 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.

During the cooling operation, the cooling tower fan 111 is driven by an AC condenser motor 112. The AC condenser motor 112 is connected to AC-100V via a triac (not shown), and a cooling water temperature sensor 91
Is controlled by the controller 9 such that the cooling water temperature detected by the controller 9 is maintained at 31.5 ° C. (at the time of cooling proportional control).

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 the indoor heat exchanger 21 with the blower fan 211, the cistern 22, the cold / hot water pump section 802 (at a maximum capacity of 620 liter / h), and the evaporator heat transfer tube 24 in an annular manner. The cold / hot water 20 is circulated by the cold / hot water pump section 802 of the tandem pump 80. The amount of heat absorbed by the indoor heat exchanger 21 during the cooling operation is 43
40 kcal (at the maximum capacity), and the heat radiation amount of the indoor heat exchanger 21 during the heating operation is 6,200 kcal (at the 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 3)
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 and 313 and a gas proportional valve 314 connected thereto.
16 supplies and burns the combustion air in an amount corresponding to the input.

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.

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.

When the cooling operation is started in the cold state (HGE temperature <80 ° C.), the controller 9 sets the input of the gas burner 311 at the start of ignition to 8000 kcal / h, and the HGE temperature ≧ 150 ° C. or the cold / hot water temperature ≦ 11 ℃
Becomes 4,800 kcal / h.

When the cooling operation is started in the hot state (HGE temperature ≧ 80 ° C.), the controller 9 sets the input of the gas burner 311 at the start of ignition to 2500 kcal / h.
And

When the cooling operation becomes stable and the temperature of the cold / hot water ≤ 9 ° C, the controller 9 sets the temperature (average temperature) of the cold / hot water 20 detected by the cold / hot water sensor 201 to 7 ° C. Between 1500 kcal / h and 4800 kcal / h, the input of the gas burner 311 is proportionally controlled (cooling proportional control).

When starting the heating operation in the cold state (HGE temperature <60 ° C.), the controller 9 sets the input of the gas burner 311 at the start of ignition to 8000 kcal / h. When starting the heating operation in the hot state (HG
(E temperature ≧ 60 ° C.), and the controller 9 sets the input of the gas burner 311 at the start of ignition to 2500 kcal / h.

Then, the heating operation is stabilized and the cold / hot water temperature ≧
When the temperature reaches 58 ° C., the controller 9 controls the input of the gas burner 311 between 1500 kcal / h and 8000 kcal / h so that the temperature (average temperature) of the cold / hot water 20 detected by the cold / hot water sensor 201 becomes 60 ° C. Proportional control (heating proportional control) is performed.

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. or,
During the heating operation in which the cooling / heating switching valve 36 is opened, the middle liquid pipe 3
Since the flow path resistance 44 is generated by the orifice 343,
All of the intermediate liquid 34 flows through the heating pipe 361 and is not sent to the low-temperature regenerator 4.

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 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 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
→ 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.
And heat exchange with the air blown into the room (at maximum capacity, endothermic about 4000 kcal / h) to raise the temperature and raise the temperature of the cold and hot water 2
0 is again cooled by passing 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, high-temperature absorbing liquid enters the absorber 7 from the evaporator 6.

A 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 pump section 801 and a cold / hot water pump section 802. The tandem pump 80 is feedback controlled so as to rotate based on the HGE temperature-rotation speed operation line during the cooling proportional operation.
In addition, during the heating proportional operation, feedback control is performed such that the motor rotates based on the input-rotation speed operation line. still,
Instead of the tandem pump 80 (one unit), a cold / hot water pump and a solution pump (two units in total) may be used.

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

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
GE temperature sensor 301, cold / hot water sensor 201 for detecting the temperature of cold / hot water 20 supplied to indoor heat exchanger 21, EVA temperature sensor 61 for detecting the internal temperature of evaporator 6, Hall element, and 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 supplied to the cooling water.

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, refrigerant valve 54, combustion fan 316, and cooling / heating switching valve 36.

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 (at the time of cooling / heating operation).

During the cooling operation, the refrigerant in the dilute liquid 30 is vaporized and separated into the intermediate liquid 34 and the vapor refrigerant 35. During the cooling operation (see FIG. 3), 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
And is collected in the absorber 7 as the dilute liquid 30 and returned to the boiling unit 31 of the high-temperature regenerator 3 by the solution pump unit 801.

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 sent to the indoor heat exchanger 21 by the cold / hot water pump section 802. Then, the air passes through the indoor heat exchanger 21, and cool air is blown into the room by the blower fan 211, thereby performing 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).

The cooling operation is stabilized (cooling / hot water ≦ 9 ° C .; FIG. 4)
(YES in steps s7 and s10), the controller 9 controls 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. Proportional control (cooling proportional control; 1)
500 kcal / h to 4800 kcal / h).
Further, the controller 9 performs feedback control of the cooling tower fan 111 so that the temperature of the cooling water 10 supplied to the absorber heat transfer tube 14 is maintained at 31.5 ° C. during the cooling proportional control.

In the heating operation, a 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 / hot water 20 flowing through the evaporator heat transfer pipe 24. The temperature drops, and further enters the absorber 7 and accumulates in the absorber 7. Incidentally, the collected absorbing liquid is supplied to the solution pump unit 801.
Is returned into the boiler 31.

The cold / hot water 20 heated and heated by the high-temperature absorbing liquid is supplied to the indoor heat exchanger 21 by the cold / hot water pump section 802 and passes through the indoor exchanger 21, and hot air is blown by the blower fan 211. The room is heated by being blown into the room.

When the heating operation is stabilized (cold / hot water ≧ 58 ° C .; YES in steps s5 and s8 in FIG. 5), the controller 9 outputs the cold / hot water supplied to the indoor heat exchanger 21 based on the output of the cold / hot water sensor 201. The input of the gas burner 311 is proportionally controlled (heating proportional control; 1) so that the temperature of the water 20 becomes 60 ° C.
500 kcal / h to 8000 kcal / h).
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, the details of the controller 9 during the cooling operation of the absorption type air conditioner A will be described based on the operation explanatory diagram of FIG. 3 and the flowchart of FIG. When the user turns on a cooling operation switch (not shown), the microcomputer of the controller 9 operates based on the flowchart of FIG.

A cooling tower process (C) in which water supply valve 221 is instructed to open and water is stored in cistern 22
T processing) is performed in step s1, and the process proceeds 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 80 ° C. or higher,
If the HGE temperature is lower than 80 ° C. (NO; cold start), the process proceeds to step s3. If the HGE temperature is 80 ° C. or higher (YES; hot start), the process proceeds to step s8.

In step s3, the ignition operation is performed, and the gas burner 311 starts burning. The cooling / heating switching valve 36 is maintained closed. In step s4, input 8000k
cal / h and start the cooling operation, HGE temperature ≧ 8
When the temperature reaches 0 ° C., the power supply to the tandem pump 80 is started.
When the HGE temperature reaches 100 ° C., the cooling water pump 13
Start energization.

In step s5, HGE temperature ≧ 150 ° C.
Alternatively, it is determined whether or not cold / hot water ≦ 11 ° C. is satisfied. If any of them is satisfied (YES), the process proceeds to step s6. If neither is satisfied (NO), the process returns to step s4 and returns to 8000.
Maintain an input of kcal / h.

In step s6, the input is set to 4800k.
cal / h, and the rotational speed of the tandem pump 80 is also reduced. In step s7, it is determined whether or not the temperature of the cold / hot water has decreased to 9 ° C. or less. If the temperature of the cold / hot water ≦ 9 ° C. (YES), the process proceeds to step s11. If the temperature of the cold / hot water> 9 ° C. (NO).
Returns to step s6 and maintains the input at 4800 kcal / h.

At step s8, an ignition operation is performed, and the gas burner 311 starts combustion. The cooling / heating switching valve 36 is maintained closed. In step s9, the input is 2500k
The cooling operation is started at cal / h, and energization of the tandem pump 80 is started. When the HGE temperature reaches 100 ° C., energization of the cooling water pump 13 is started.

In step s10, it is determined whether or not the temperature of the cold / hot water has dropped to 9 ° C. or less. If the temperature of the cold / hot water ≦ 9 ° C. (YE
S) proceeds to step s11, and if the temperature is lower than 9 ° C. (NO), the process returns to step s9 to 2500 kcal / h
Maintain input at.

In step s11, the controller 9 controls the gas burner 3 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.
11 inputs are controlled by cooling proportional control (1500 kcal /
h to 4800 kcal / h). Further, the tandem pump 80 is feedback-controlled to a rotation speed (HGE temperature-rotation speed operation line) proportional to the HGE temperature. Further, the temperature of the cooling water 10 supplied to the absorber heat transfer tube 14 is 31.5 ° C.
The feedback control of the cooling tower fan 111 is performed so as to maintain the temperature of the cooling tower.

In step s12, 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 s is performed.
The process proceeds to step S13, and if none is satisfied (NO), the process returns to step s11 to continue the cooling proportional control.

At step s13, an instruction to extinguish the gas burner 311 is issued. In step s14, a cooling-off operation process or a thermo-off operation process, which will be described later, is performed.
Proceed to 15.

[Cooling Off Operation Processing] After extinguishing the gas burner 311, while the HGE temperature exceeds 100 ° C., the tandem pump 80 is feedback-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 reduced to 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 s15, 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), and if so (YES).
Returns to step s8 to perform cooling-off startup or thermo-off startup. If not established (NO)
Returns to step s14 to execute the cooling-off operation process or the thermo-off operation process.

Next, the details of the controller 9 during the heating operation of the absorption type air conditioner A will be described based on the operation explanatory diagram of FIG. 5 and the flowchart of FIG. When the user turns on a heating operation switch (not shown), the microcomputer of the controller 9 operates based on the flowchart of FIG.

In step S1, a drain valve (not shown) is kept open to perform a drain process for draining the cooling water 10 in the cooling water circuit 1. When the drainage process is completed, in step S2, the controller 9 determines whether or not HGE ≧ 60 ° C.
If <60 ° C. (cold start; NO), proceed to step S3, and if HGE ≧ 60 ° C. (hot start;
YES) proceeds to step S6.

In step S3, the controller 9 performs an ignition operation, and the gas burner 311 starts combustion. Further, the cooling / heating switching valve 36 is opened. In step S4, the controller 9
The heating operation is started with the input set to 8000 kcal / h, and when the HGE temperature ≥60 ° C is reached, the tandem pump 80 is energized and rotated at about 3000 rpm (constant).

In step S5, the controller 9 determines whether or not the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 has risen to 58 ° C. or higher, based on the output of the cold / hot water sensor 201, and raises the temperature. If the temperature has risen (YES), the process proceeds to step S9. If the temperature has not risen (NO), the process returns to step S4 and returns to step S4.
Maintain an input of 0 kcal / h.

In step S6, the controller 9 performs an ignition operation, and the gas burner 311 starts combustion. Further, the cooling / heating switching valve 36 is opened. In step S7, the controller 9
The heating operation was started with the input set to 2500 kcal / h, and the tandem pump 80 was energized for approximately 200 kcal / h.
Rotate at 0 rpm (constant).

In step S8, the controller 9 determines whether or not the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 has risen to 58 ° C. or higher based on the output of the cold / hot water sensor 201, and raises the temperature. If the temperature has risen (YES), the process proceeds to step S9. If the temperature has not risen (NO), the process returns to step S7 and returns to step S7.
Maintain an input of 0 kcal / h.

In step S 9, the controller 9 controls the input of the gas burner 311 for heating proportional control (1500 kcal / h to 8000 kcal / h) so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 is maintained at 60 ° C. h) Yes. Further, the tandem pump 80 is feedback-controlled based on the input-rotation speed operation line.

Tandem rotation speed (rpm) = input (kcal / h) × K + A where K and A are constants

In step S10, it is determined whether or not cold / hot water ≧ 62 ° C. or room temperature> set temperature is satisfied (thermo-off, heating-off). If any of the conditions is satisfied (YES), the flow proceeds to step S11, and both are satisfied. If not (NO), the process returns to step S9 to continue the heating proportional control.

In step S 11, an instruction is given to extinguish the gas burner 311. In step S12, a heating-off operation process or a thermo-off operation process, which will be described later, is performed.
Proceed to 13.

[Heating Off Operation Processing] When the gas burner 311 extinguishes, the controller 9 changes the rotation speed control of the tandem pump 80 from the input-rotation speed operation line control to the HGE temperature-rotation speed operation line control.

[Thermo-off operation process] Gas burner 311
Is extinguished, the controller 9 changes the rotation speed control of the tandem pump 80 from the input-rotation speed operation line control to the HGE control.
Change to temperature-speed operation line control.

In step S13, it is determined whether or not cold / hot water ≦ 60 ° C. (when heating is off) or room temperature ≦ set temperature (when thermostat is off), and if so (YES).
Returns to step S6 to perform heating-off startup or thermo-off startup. If not established (NO)
Returns to step S12 to perform the heating-off operation process or the thermo-off operation process.

Next, advantages of the absorption type air conditioner A of this embodiment will be described. The absorption-type air conditioner A has a low HGE temperature at the time of initial operation or after a long time has elapsed since the last operation stop (lower than 80 ° C. in the cooling operation, lower than 60 ° C. in the heating operation). When starting heating operation,
From the time of ignition until the temperature of the cold and hot water reaches a predetermined temperature (9 ° C. or less for cooling and 58 ° C. or more for heating), the input of the gas burner 311 is set to 8000 kcal / h, and the temperature of the absorbing solution in the high-temperature regenerator 3 is rapidly increased. During cooling operation, concentrate 4
1 and the generation of the liquid refrigerant, the evaporation of the liquid refrigerant in the evaporator 6 and the cooling of the cold / hot water 20 by the absorption action of the absorber 7 are promoted. It is a configuration that promotes heating.

For this reason, when starting the cooling operation / heating operation from the cold state, compared with the absorption air conditioner in which the input at the time of startup is fixed to, for example, the middle point (4000 kcal / h) of the combustion capacity range, the absorption air conditioning system Device A is
The time until the cooling capacity and heating capacity appear is 1/2 to 1/3
Can be shortened to

Further, in the absorption type air conditioner A, the HGE temperature is high (less than 8 hours in the cooling operation) since no time has elapsed since the cooling / heating is turned off, the operation is started from the thermo-off, or the operation is stopped.
0 ° C or higher, 60 ° C or higher for heating operation) In the case of starting the cooling operation or heating operation from the hot state, until the temperature of the cold / hot water reaches a predetermined temperature (9 ° C or lower for cooling and 58 ° C or higher for heating) from ignition. , Input 25 of gas burner 311
The configuration is set to 00 kcal / h.

For this reason, the absorption type air conditioner A can prevent the high temperature regenerator 3 from being overheated when starting the cooling operation / heating operation from the hot state. Therefore, input loss can be prevented, and gas is not wasted. In addition, when the operation is started from cooling / heating off or thermo-off, the control can be promptly shifted to cooling / heating proportional control without frequent hunting.

The present invention includes the following embodiments in addition to the above embodiments. a. In the above embodiment, the absorbing liquid circuit 8 may be changed to the following configuration, which has an effect similar to that of the absorption air conditioner A (corresponding to claim 1). The absorbent circuit 8 includes a regenerator in which an absorbent is charged and a heating unit is heated by a heating source such as a gas burner, a condenser in which a condenser heat transfer tube is provided, and a high-temperature vapor refrigerant is sent from the regenerator, and a heating operation. An evaporator to which a high-temperature absorbing liquid and a vapor refrigerant are fed to evaporate a liquid refrigerant liquefied by a condenser during a cooling operation, and an absorber heat transfer tube provided alongside the evaporator, and a vapor refrigerant evaporated by the evaporator during a cooling operation. And a solution pump for returning the absorbent in the absorber to the regenerator. In this way, when the absorption liquid circuit 8 is made to have a single effect, the cooling / cooling operation is compared with that of the double effect (absorption air conditioner A).
Although the heating efficiency is reduced, the structure of the absorption air conditioner can be simplified.

B. In the above embodiment, when starting operation in the hot state, low input (2500 kcal / h),
At the start of operation in cold state, high input (800
0 kcal / h), but the input at the time of startup may be determined according to the HGE temperature.

C. The distinction between cold state and hot state
In addition to the HGE temperature, it may be performed based on the elapsed time from the end of the previous operation. d. The heating source may be an electric heater or the like in addition to the gas burner. e. The absorption air conditioner may be dedicated to cooling.

F. In the above embodiment, the time at which the operation is stabilized is determined by the temperature of the cold and hot water. However, when the temperature of the absorbent (HGE temperature) in the high-temperature regenerator has reached a predetermined temperature, or when a predetermined time has elapsed by a timer. Is also good.

[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 a flowchart showing an operation of the absorption type air conditioner during a cooling operation.

FIG. 5 is an operation explanatory diagram when the absorption type air conditioner is operated for heating.

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

FIG. 7 is a flowchart showing an operation of the conventional absorption 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 (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 24 Evaporator heat transfer tube 30 Dilute solution (low concentration absorption solution) 31 Boiler (heating unit) 34 Medium solution (medium concentration absorption solution) 35, 42 vapor refrigerant 41 concentrated liquid (high concentration absorption liquid) 211 blower fan 311 gas burner (heating source) 801 solution pump section (solution pump) 802 cold / hot water pump section (cold / hot water pump)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F25B 15/00 306

Claims (2)

(57) [Claims] 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 a cooling operation, and a blower fan are provided. A cooling / heating water circuit in which an indoor heat exchanger and an evaporator heat transfer tube are connected in a ring, and a cooling / heating water pump circulates cooling / heating water; a regenerator in which an absorbing liquid is filled and a heating unit is heated by a heating source; A condenser in which a high-temperature vapor refrigerant is sent from the regenerator and a high-temperature absorbing liquid is sent in a heating operation, and an evaporator evaporates a liquid refrigerant liquefied in the condenser in a cooling operation in a cooling operation. The absorber heat transfer tube is provided in parallel with the heat absorber, and during cooling operation, the vapor refrigerant evaporated by the evaporator is absorbed by the concentrated absorbent sent from the regenerator, and the absorbent in the absorber is absorbed by the absorbent. To regenerator An absorption liquid circuit having a solution pump, and a controller for controlling the heating power of the heating source so that the cold and hot water maintains a predetermined temperature, and blows cold or hot air into the room by the blowing fan. An air conditioner that performs indoor cooling and heating, and when the operation of the absorption liquid in the regenerator is started from a low temperature state, the heating power of the heating source is fixed until the operation becomes stable. When starting operation from high temperature,
An absorption type air conditioner wherein the heating power of the heating source is fixed to a small value until the operation becomes stable. 2. 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, 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 filled and the heating unit is heated by a heating source to absorb low concentrations during cooling operation. A high-temperature regenerator that vaporizes a refrigerant in a liquid and separates it into a medium-concentration absorbing liquid and a vapor refrigerant; surrounds the high-temperature regenerator and separates the medium-concentration absorbing liquid into a high-concentration absorbing liquid and a vapor refrigerant during cooling operation. A condenser in which a high-temperature vapor refrigerant is sent from each regenerator during cooling operation, and a high-temperature absorbing liquid is sent from the high-temperature regenerator during heating operation, and the condensing is performed during cooling operation. vessel An evaporator that evaporates the liquefied liquid refrigerant, and the absorber heat transfer tube is disposed in parallel with the evaporator, and absorbs the vapor refrigerant evaporated by the evaporator in the high-concentration absorbing liquid sent from the low-temperature regenerator during cooling operation. An absorber, an absorber circuit having a solution pump for returning the absorbing liquid in the absorber to the high-temperature regenerator, and a controller for controlling the heating power of the heating source so that the cold and hot water maintains a predetermined temperature. An air conditioner that blows cold or warm air into the room by the blower fan to perform indoor cooling and heating, wherein the operation of the absorption liquid in a high-temperature regenerator is started from a low temperature state. In the case of, fix the heating power of the heating source to a large value until the operation is stabilized, and in the case of starting operation from a high temperature state, fix the heating power of the heating source to a small value until the operation is stabilized. Characteristic absorption type air conditioner.