JP3056991B2 - 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 high-temperature regenerator that vaporizes the refrigerant in the low-concentration absorbent and separates it into a medium-concentration liquid and a vapor refrigerant, surrounds the high-temperature regenerator, and cools the medium-concentration liquid with the high-concentration liquid and vapor during cooling operation. A low-temperature regenerator separated from the refrigerant, the condenser heat transfer tube is provided, and a steam refrigerant is sent from the high-temperature regenerator during the heating operation and a high-temperature steam refrigerant is sent from each regenerator during the cooling operation during the cooling operation. An evaporator to which a high-temperature absorbent is sent from the high-temperature regenerator to evaporate the liquid refrigerant liquefied by the condenser during the cooling operation, and the absorber heat transfer tube provided alongside the evaporator and the evaporator to be operated during the cooling operation. An absorber for absorbing the vapor refrigerant evaporated in 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, and during cooling operation, The temperature of the cooling water supplied to the absorber heat transfer tube is adjusted to a predetermined temperature (for example, 31.
The temperature of the cold / hot water supplied to the indoor heat exchanger is controlled to a set temperature (for example, 7 ° C.) at which sufficient cooling capacity can be obtained.
And a controller (for example, 1500 kcal to 4800 kcal) for proportionally controlling the heating power of the heating source so as to be maintained at a constant temperature. In recent years, attention has been paid to an absorption type air conditioner that does not use an air conditioner.

[0003]

In the case where the temperature of the cooling water is reduced by evaporating the water by the outdoor heat exchanger, when the cooling operation is performed when the outside air is at high temperature and high humidity, the rotation speed of the outdoor fan is increased. Even so, a state occurs in which the temperature of the cooling water supplied to the absorber heat transfer tube does not drop to a predetermined temperature (for example, 31.5 ° C.) (the heat radiation capacity of the outdoor heat exchanger has reached its limit). The state where the temperature of the cooling water does not drop to the predetermined temperature may occur not only when the outside air is hot and humid, but also when the cooling load becomes large.

[0004] The absorber acts to absorb the refrigerant evaporated by the evaporator and reduce the pressure in the pipe which rises due to evaporation. As described above, the temperature of the cooling water is maintained at a predetermined temperature (for example, 31.5 ° C). ), The temperature of the absorber that generates heat cannot be reduced, and the absorption capacity decreases. For this reason, the pressure in the pipe increases, and the ability of the evaporator to evaporate the liquid refrigerant decreases. If the temperature of the cooling water does not drop to a predetermined temperature, the temperature of the condenser cannot be lowered, and the ability to liquefy the vapor refrigerant generated by the regenerator is reduced.

[0005] Then, even if it is possible to further increase the heating power for heating the regenerator and generate a large amount of the absorbing liquid and the vapor refrigerant, the evaporation capacity (cold and hot water) is reduced due to the reduction of the absorption capacity and the reduction of the condensation capacity. When the cooling capacity reaches the limit, no matter how much the heating power is increased, it does not contribute to the increase in the cooling capacity.
As described above, in the conventional apparatus, the heating power is only controlled so that the temperature of the cold / hot water becomes a predetermined temperature. Therefore, even if the cooling capacity cannot be increased as described above, the heating power is maximized. Power, which wastes energy and has the following disadvantages:

[0006] The temperature of the high-temperature regenerator becomes the cooling high temperature abnormal temperature (1).
75 ° C.), and when it reaches, the cooling high temperature error is stopped, so that the cooling operation cannot be continued. Since the temperature of the cooling water rises, the components of the cooling water circuit deteriorate. An object of the present invention is to provide an absorption type air conditioner capable of performing a cooling operation as much as possible even when the outside air is hot and humid.

[0007]

In order to solve the above problems, the present invention employs the following constitution. (1) An outdoor heat exchanger provided with an outdoor fan, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in a ring shape, and a cooling water circuit for circulating cooling water by a cooling water pump during a cooling operation, and a blowing fan A cold and hot water circuit that circulates cold and hot water by a cold and hot water pump and a heating and cooling unit that is heated by a heating source and has a low temperature during cooling operation. A high-temperature regenerator that vaporizes the refrigerant in the concentration absorbing liquid and separates the medium-concentration absorbing liquid and vapor refrigerant, surrounds the high-temperature regenerator, and cools the medium-concentration absorbing liquid with the high-concentration absorbing liquid and the vapor refrigerant during cooling operation. A low-temperature regenerator to be separated into a condenser, a condenser in which the condenser heat transfer tubes are disposed, and a high-temperature vapor refrigerant is sent from each regenerator during the cooling operation, and an evaporator that evaporates the liquid refrigerant liquefied by the condenser during the cooling operation. To the evaporator Absorber to absorb a high concentration absorption solution to be fed to the vapor refrigerant evaporated by the evaporator from the low-temperature regenerator during setting is provided to the cooling operation the absorber heat transfer tube,
An absorption liquid circuit having a solution pump for returning the absorption liquid in the absorber to the high-temperature regenerator; and, during cooling operation, such that the temperature of the cooling water supplied to the absorber heat transfer tube is maintained at a predetermined temperature. A controller for controlling the number of revolutions of the outdoor fan and proportionally controlling the heating power of the heating source so that the temperature of the cold / hot water supplied to the indoor heat exchanger is maintained at a set temperature. In the device, when the temperature of the cold / hot water exceeds the set temperature and the outdoor fan is at the maximum number of revolutions, the controller stops proportional control of the heating power and heats the heating source. Is maintained at the heating power immediately before discontinuation.

(2) An outdoor heat exchanger provided with an outdoor fan, an absorber heat transfer tube, and a condenser heat transfer tube are sequentially connected in a ring shape, and a cooling water circuit for circulating cooling water by a cooling water pump during cooling operation. A cooling / heating water circuit for circulating cooling / heating water by a cooling / heating water pump, and a cooling / heating water circuit for circulating cooling / heating water by a cooling / heating water pump, and a heating unit heated by a heating source by a heating source. 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 absorbent with the high-concentration absorbent. A low-temperature regenerator that separates into a vapor 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 liquid refrigerant liquefied by the condenser evaporates during cooling operation. Evaporator An absorber which is provided in parallel with the evaporator and which has the absorber heat transfer tube, and which absorbs the vapor refrigerant evaporated by the evaporator into the high-concentration absorbent sent from the low-temperature regenerator during cooling operation, and absorption in the absorber An absorbing liquid circuit having a solution pump for returning a liquid to the high-temperature regenerator; and, during cooling operation, rotating the outdoor fan so that the temperature of the cooling water supplied to the absorber heat transfer tube is maintained at a predetermined temperature. Controlling the heating power of the heating source proportionally so that the temperature of the cold / hot water supplied to the indoor heat exchanger is maintained at a set temperature. + M ° C.) as the first monitored temperature, and the second to n-th monitored temperatures are set every m ° C. from the first monitored temperature, and the temperature of the cooling water is equal to or higher than the first monitored temperature. If it continues for a specified time or more, the controller As well as stop the proportional control, by a predetermined amount from the heating power of the stop just before the heating power of the heating source is reduced, further, the temperature of the cooling water is second
If the state equal to or higher than the monitored temperature continues for the specified time or more, the controller further reduces the heating power of the heating source by the specified amount, and performs this reduction operation to the (n-1) th monitored temperature. When the temperature of the cooling water is equal to or higher than the n-th monitoring temperature for a predetermined time or longer, the controller instructs the cooling operation to stop.

(3) The absorbent circuit has the configuration of (1) or (2) above, and the absorbent circuit includes a regenerator and a condenser heat transfer tube in which the absorbent is filled and the heating section is heated by the heating source. A condenser in which high-temperature vapor refrigerant is sent from the regenerator during cooling operation, an evaporator for evaporating liquid refrigerant liquefied in the condenser during cooling operation, and the absorber heat transfer tube attached to the evaporator. During the cooling operation, the apparatus comprises an absorber for absorbing the vapor refrigerant evaporated by the evaporator into the high-concentration absorbent sent from the regenerator, and a solution pump for returning the absorbent in the absorber to the regenerator.

[0010]

[Action]

[Cooling Operation When Claims 1 and 2 are Adopted] In the high-temperature regenerator containing the absorbing liquid, the heating section is heated by the 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 hits the evaporator heat transfer tube through which the cold and hot water flows, and evaporates to cool the cold and hot water. Then, the cooled cold / hot water passes through the indoor heat exchanger, and cool air is blown into the room by the blower fan, thereby performing indoor cooling. Further, during the cooling operation, the vapor refrigerant evaporated by the evaporator enters the absorber, is absorbed by the high-concentration absorbing liquid sent from the low-temperature regenerator, and accumulates in the absorber. The absorbent collected in the absorber is returned to the high-temperature regenerator by the solution pump.

During the cooling operation, the controller controls 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, and controls the number of rotations of the cold and hot water supplied to the indoor heat exchanger. The heating power of the heating source is proportionally controlled so that the temperature is maintained at the set temperature.

[Cooling operation in case of adopting claim 3] A heating source heats a 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 hits the evaporator heat transfer tube through which the cold and hot water flows, evaporates and cools the cold and hot water. Then, the cooled hot and cold water passes through the indoor heat exchanger, and cool air is blown into the room by the blower fan, thereby performing indoor cooling. During the cooling operation, the vapor refrigerant evaporated by the evaporator and entering the absorber is
It is absorbed by the high concentration absorbing liquid sent from the regenerator and accumulates in the absorber. The absorbent collected in the absorber is returned to the regenerator by the solution pump.

[Claims 1, 2, and 3 common cooling operation (bad conditions)] However, if the outside air is hot and humid, even if the outdoor fan rotates at the maximum number of revolutions, the absorber heat transfer tube will A state occurs in which the temperature of the supplied cooling water does not drop to the predetermined temperature (the heat radiation capacity of the outdoor heat exchanger has reached its limit). In this case, since the capacity of the condenser and the absorber is reduced, the capacity of the evaporator is also reduced, and the temperature of the cold and hot water supplied to the indoor heat exchanger does not drop to the set temperature and exceeds the set temperature.

[Cooling operation (bad condition) when the first and third aspects are adopted] If the cooling operation is performed when the outside air is hot and humid, even if the number of rotations of the outdoor fan is maximized, the absorber power transmission is performed. There is a case where the temperature of the cooling water supplied to the heat pipe does not drop to the predetermined temperature (the heat radiation capacity of the outdoor heat exchanger has reached the limit). In this case, since the capacity of the condenser and the absorber decreases, the capacity of the evaporator also decreases, and the temperature of the cold and hot water supplied to the indoor heat exchanger cannot be maintained at the predetermined temperature, and the temperature of the cold and hot water falls below the set temperature. Cross over. The controller suspends the proportional control of the heating power and maintains the heating power of the heating source at the heating power immediately before the suspension.

[Cooling operation (bad conditions) when the second and third aspects are adopted] If the cooling operation is performed when the outside air is hot and humid, even if the number of rotations of the outdoor fan is maximized, the power transmission to the absorber is performed. There is a case where the temperature of the cooling water supplied to the heat pipe does not drop to the predetermined temperature (the heat radiation capacity of the outdoor heat exchanger has reached the limit). In this case, since the capacity of the condenser and the absorber decreases, the capacity of the evaporator also decreases, and the temperature of the cold and hot water supplied to the indoor heat exchanger cannot be maintained at the predetermined temperature, and the temperature of the cold and hot water falls below the set temperature. Cross over.

The outside air is hot and humid, and the temperature of the cooling water is
If the state where the temperature becomes equal to or higher than the monitoring temperature continues for a specified time or more, the controller stops the proportional control of the heating power, reduces the heating power of the heating source by a specified amount from the heating power immediately before the stop, and further cools the cooling water. When the temperature of the second monitor temperature is equal to or higher than the second monitoring temperature for a predetermined time or more, the controller further reduces the heating power of the heating source by a predetermined amount. Then, this reducing operation is performed up to the (n-1) th monitoring temperature, and when the temperature of the cooling water is equal to or higher than the nth monitoring temperature for a predetermined time or more, the controller instructs the cooling operation to stop.

[0019]

When the outside air is hot and humid, the temperature of the cold and hot water exceeds the set temperature, and the outdoor fan is rotating at the maximum speed, the controller determines the temperature of the cold and hot water. Since the operation of proportionally controlling the heating power of the heating source is stopped so that the heating power is maintained at the set temperature, and the heating power of the heating source is maintained at the heating power immediately before the suspension, the following effects are obtained. Since the heating power is limited to a range that contributes to the cooling capacity, energy is not wasted. Further, even if the cooling operation is performed when the outside air is hot and humid, the temperature of the high-temperature regenerator or the regenerator does not become abnormally high, so that the cooling operation can be continued.

According to a second aspect of the present invention, when the cooling operation is performed when the outside air is hot and humid, and the temperature of the cooling water is equal to or higher than the first monitoring temperature for a predetermined time or longer, the controller controls the proportional control of the heating power. Is stopped, the heating power of the heating source is reduced by a specified amount from the heating power immediately before the stop, and further, when the temperature of the cooling water is equal to or higher than the second monitoring temperature for a specified time or longer, the controller turns on the heating source. Is further reduced by a specified amount, and this reducing operation is performed to the (n-1) th monitoring temperature. When the temperature of the cooling water is equal to or higher than the nth monitoring temperature for a predetermined time or longer, the controller Since the configuration is such that the cooling operation is instructed, the following effects can be obtained.

Since the heating power is limited within a range contributing to the cooling capacity, energy is not wasted. Further, even if the cooling operation is performed when the outside air is hot and humid, the temperature of the high-temperature regenerator or the regenerator does not become abnormally high, so that the cooling operation can be continued as much as possible. When the operating environment is extremely severe (when the temperature of the cooling water is equal to or higher than the n-th monitoring temperature for a predetermined time or longer), the controller instructs the cooling operation to stop and the cooling operation is stopped. Excellent.

[Claim 3] When the absorption liquid circuit has a single effect, the air conditioning efficiency is lower than that of the double effect (claims 1 and 2), but the structure can be simplified.

[0023]

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

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 includes an AC condenser motor 112 (100 V, power consumption 80 W, 8 μF, 12 V).
00 rpm / 60 Hz). 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 so that the cooling water temperature detected by the controller 9 is maintained at 31.5 ° C. The cooling water temperature sensor 9
1 is provided in a cooling water pipe 101 connecting between the cooling water pump 13 and the absorber heat transfer pipe 14, and detects the temperature of the cooling water 10 supplied to the absorber heat transfer pipe 14.

During the heating operation, all the cooling water 10 in the cooling water circuit 1 is drained, and the AC condenser motor 112 is not energized.

The cold / hot water circuit 2 comprises 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, which are connected 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. Liquid 30 (58 in this embodiment).
(Aqueous lithium bromide aqueous solution) is evaporated to separate it into a middle 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. Incidentally, 32
1 is an adiabatic gap. An HG 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.
An E temperature sensor 301 is provided. Cold / hot water sensor 2
Reference numeral 01 denotes a temperature of the cold / hot water 20 that is provided in the cold / hot water pipe 29 on the inlet side of the indoor heat exchanger 21 and is supplied to the indoor heat exchanger 21.

During the cooling operation, the gas burner 311 basically has an input of 1500 kcal to 4800 kcal so that the temperature (average temperature) of the cold / hot water 20 detected by the cold / hot water sensors 201, 201 becomes 7 ° C. Between,
The proportional control (cooling proportional control) is performed by the controller 9 (FIG. 5).
Step s1). During turbo cooling operation, the input is set to 6500 kcal.

During the heating operation, the gas burner 311 has an input of 1500 kcal to 8000 kcal so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 60 ° C.
During 1, proportional control (heating proportional control) is performed by the controller 9. During the cooling operation, since the cooling / heating switching valve 36 is closed, the intermediate liquid 34 (165 ° C.) is supplied from the intermediate liquid pipe 341 → the high-temperature heat exchange channel 342 → the intermediate liquid pipe 34 with the orifice 343.
4 and is sent to the upper part of the low-temperature regenerator 4.

The low-temperature regenerator 4 surrounds the collecting container 33 of the high-temperature regenerator 3 and receives heat from the collecting container 33 to heat the middle liquid 34 during the cooling operation. Thereby, a part of the middle liquid 34 is vaporized and separated into the concentrated liquid 41 (62% aqueous lithium bromide solution) and the vapor refrigerant 42. In the heating operation in which the cooling / heating switching valve 36 is opened, the orifice 343 generates a flow path resistance, so that the intermediate liquid 34 is not sent to the low-temperature regenerator 4.

During the heating operation, the condenser 5 has an orifice 5
A small amount of high-temperature vapor refrigerant 35 is sent from the high-temperature regenerator 3 through a vapor refrigerant pipe 51 provided with the cooling water 1.
Since 0 does not flow through the condenser heat transfer tube 15, it does not condense. During the cooling operation, the steam refrigerants 35 and 42 are sent from the high-temperature regenerator 3 and the low-temperature regenerator 4 to the condenser 5, and
5 and 42 are cooled and liquefied by the cooling water 10 flowing through the coil-shaped condenser heat transfer tube 15, and the liquid refrigerant (water) 52 accumulates at the bottom of the condenser 5. The cooling water 10 whose temperature has been raised (37.5 ° C.) is cooled (31.5 ° C.) in the cooling tower 11.

The evaporator 6 is provided with a coil-shaped (with groove) evaporator heat transfer tube 24. During the heating operation, the cooling / heating switching valve 36 is opened, so that the high-temperature absorbing liquid is supplied to the cooling / heating switching valve 36 →
It is sent to the evaporator 6 via the heating pipe 361. or,
At the same time, a high-temperature vapor refrigerant 35 is sent from the condenser 5 through the refrigerant pipe 53 → the refrigerant valve 54. Further, during the cooling operation, the liquid refrigerant 52 is changed to a refrigerant pipe 53 → a refrigerant valve 54 →
The liquid refrigerant 52 is sprayed to the evaporator heat transfer tube 24 via the sprayer 55 and the inside of the evaporator 6 is substantially vacuum (about 6.5 mmHg). Take away and evaporate. Then, the cooled hot and cold water 20
Represents heat exchange with the air blown indoors by the indoor heat exchanger 21 disposed indoors (at maximum capacity, heat absorption 4340 kcal /
h) The temperature is raised, and the heated cold / hot water 20 passes through the evaporator heat transfer tube 24 again and is cooled.

The absorber 7 provided with the absorber heat transfer tube 14 is:
The upper part is connected to the evaporator 6 and is connected to the evaporator 6.
Then, during the cooling operation, the vapor refrigerant evaporated in the evaporator 6 enters the absorber 7 from above, and 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 (rated output 200 W, power consumption 250 W) operating at AC-100V, and is provided with a Hall element (not shown). During the heating operation, the rotation speed of the solution pump 80 is controlled based on the HGE temperature-rotation speed characteristic. During the cooling operation, the rotation speed is controlled to be proportional to the input. Since the flow control of the cold / hot water 20 may be rough, 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) collected at the bottom of the absorber 7 is diluted with a diluted liquid pipe 71 → a solution pump 80.
(Maximum flow rate 100 liter / h) → dilute liquid pipe 72 → low temperature / high temperature heat exchange flow path 73 → sent to boiler 31 of high temperature regenerator 3 via dilute liquid pipe 74.

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.

Next, the cooling operation of the absorption type air conditioner A,
The heating operation will be described. When a cooling operation switch or a heating operation switch (not shown) is turned on, the gas burner 3 is turned on.
11 starts combustion, and the controller 9 and the indoor controller 25 start control according to a predetermined procedure.

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 the cooling operation (see FIG. 4), the high-temperature steam refrigerants 35 and 42 are supplied from the high-temperature regenerator 3 and the low-temperature regenerator 4.
Is sent to the condenser 5, and during the heating operation (see FIG. 3), the steam refrigerant 35 is sent from the high-temperature regenerator 3 to the condenser 5.

During the cooling operation, the liquid refrigerant 52 sent from the condenser 5 to the evaporator 6 impinges on the evaporator heat transfer tube 24 through which the cold and hot water 20 flows, and evaporates. The evaporated vapor refrigerant enters the absorber 7. The liquid is absorbed by the concentrated liquid 41 sent from the low-temperature regenerator 4, becomes the dilute liquid 30, accumulates in the absorber 7, and is returned to the high-temperature regenerator 3 by the solution pump 80.

When the liquid refrigerant strikes the evaporator heat transfer tube 24 through which the cold and hot water 20 flows and evaporates, it cools the cold and hot water 20, and the cooled cold and hot water 20 passes through the indoor heat exchanger 21, Is blown out into the room, thereby performing indoor cooling. At this time, the indoor controller 25 determines that the room temperature detected by the room temperature sensor 26 is a room temperature setting device (not shown).
The flow control valve 27 and the blower fan 211 are controlled so that the set room temperature is set.

During the cooling operation, the controller 9 basically 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. The rotation speed of the cooling tower fan 111 is controlled so that the temperature of the cooling fan 10 becomes 31.5 ° C. (Step s in FIG. 5).
1).

However, when the cooling operation is performed under bad conditions of high temperature and high humidity, the temperature of the cold and hot water
When the temperature of the cooling tower fan 111 or more is detected, the cooling tower fan 111 is in a state of insufficient cooling capacity (the details will be described later) in which the cooling tower fan 111 rotates at the maximum rotation speed (a voltage can be detected by a thyristor, a rotation speed sensor, a fan current, etc.) Case (Y in step s2 in FIG. 5)
ES → YES in step s3), the controller 9 stops the proportional control for increasing the input of the gas burner 311 and maintains the input of the gas burner 311 at the input immediately before stopping the proportional control (step S3). s
4 → YES in step s2 → YES in step s3 → step s4). If the cooling capacity shortage state is eliminated (NO in step s2 or NO in step s3),
Return to the above proportional control.

In the above-described state of insufficient cooling capacity, the cooling tower fan 111 rotates at the maximum speed when the cooling load is large (a plurality of indoor units are operated) or when the cooling operation is performed under the bad condition that the outside air is high temperature and high humidity. Even if it is rotated by a number, the temperature of the cooling water 10 supplied to the absorber heat transfer tube 14 does not fall to 31.5 ° C. (the heat radiation capacity of the cooling tower 11 has reached the limit), and the condenser 5 and the absorption Since the capacity of the heat exchanger 7 decreases, the capacity of the evaporator 6 also decreases, and even if the input of the gas burner 311 is increased, the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 does not decrease to 7 ° C. It occurs when the temperature exceeds ℃.

Specifically, when the temperature of the cooling water 10 supplied to the absorber 7 is high, the temperature of the absorber 7 that generates heat by absorption cannot be reduced, and the absorption capacity is reduced. Therefore, the pressure around the evaporator 6 increases, and the ability to evaporate the liquid refrigerant 52, that is, the ability to cool the cold / hot water 20 decreases.
Further, since the temperature of the cooling water 10 supplied to the condenser 5 is also high, the ability to liquefy the vapor refrigerants 35 and 42 generated by the regenerator decreases, and the amount of the liquid refrigerant 52 sent to the evaporator 6 decreases.
In such a state, the evaporating capacity has reached the limit, and the temperature of the cold / hot water 20 is 7 ° C. even if the heating power of the gas burner 311 is increased to generate a large amount of the middle liquid 34 and the high-temperature steam refrigerants 35 and 42. It will not drop below.

In the heating operation, the high-temperature absorbent is sent from the high-temperature regenerator 3 to the evaporator 6 mainly through the heating pipe 361, and the cold and hot water 20 flowing through the evaporator heat transfer tube 24 is heated to evaporate. The absorbing liquid in the vessel 6 enters the absorber 7 and accumulates in the absorber 7. Incidentally, the collected absorbing liquid is supplied to the solution pump 80.
To return to the high temperature regenerator 3.

The cold / hot water 20 flowing through the evaporator heat transfer tube 24 is heated, and the heated cold / hot water 20 passes through the indoor heat exchanger 21, and hot air is blown into the room by the blower fan 211 to heat the room. Done. At this time, the controller 9 controls the input (1500 to 1500) of the gas burner 311 so that the temperature of the cold / hot water 20 supplied to the indoor heat exchanger 21 becomes 60 ° C.
8000 kcal). Also, the indoor controller 25
Is set 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).
7 and the blower fan 211 are controlled.

Next, advantages of the absorption type air conditioner A of this embodiment will be described. The absorption type air conditioner A performs the cooling operation when the cooling load is large or when the outside air is in a bad condition of high temperature and high humidity, and during the proportional control (step s1 in FIG. 5), the temperature of the cold and hot water 20 becomes 7 ℃ and cooling tower fan 111
If the cooling capacity becomes insufficient at which the motor rotates at the maximum rotation speed, the controller 9 stops the proportional control, maintains the input of the gas burner 311 at the input immediately before the stop of the proportional control, and performs cooling. When the insufficiency state is resolved, the control returns to the above-described proportional control, so that the following effects are obtained.

When the cooling load is large or the cooling operation is performed under bad conditions of high temperature and high humidity, the HGE temperature does not easily reach 175 ° C. Therefore, the cooling operation may be continued without stopping the cooling high temperature error. It is easy to use. Further, since the temperature of the cooling water 10 can be prevented from rising, the cooling water pump 13
Progress of thermal degradation of the cooling tower 11 and the like can be suppressed. further,
Gas is not wasted because the input is limited to a range that contributes to the cooling capacity.

Second embodiment of the present invention (corresponding to claim 2)
Will be described based on FIGS. 1 to 4 and 6. The operation of the absorption air conditioner B when the cooling capacity is insufficient is different from that of the absorption air conditioner A (steps S1 to S26 in FIG. 6), and the other configuration is the same as that of the absorption air conditioner A.

Controller 9 is 31.5 ° C. (predetermined temperature) +2
° C (m ° C), that is, 33.5 ° C is set as the first monitoring temperature, and 35.5 ° C, 37.5 ° C, 39.5 ° C, 4
1.5 ° C. is set as the second to fifth monitoring temperatures.

When the operation shifts to the proportional control during the cooling operation, the controller 9 controls the input (1500 kcal to 4800 kcal) 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. Control (step S1 in FIG. 6).

When the cooling load is large or when the outside air is in a bad condition of high temperature and high humidity, the cooling water temperature becomes 33.5 ° C. (first monitored temperature) for 3 minutes by the cooling operation. Continue for more than (specified time) (YES in step S4)
Then, the controller 9 stops the cooling proportional control in the step S1, and reduces the input by 200 kcal (specified amount) from the input immediately before the stop of the proportional control (step S1).
5). The condition where the cooling water temperature becomes 33.5 ° C. or more is 3
If it is less than one minute, the process returns to the cooling proportional control in step S1.

Further, if the state in which the cooling water temperature becomes 35.5 ° C. (second monitoring temperature) or more continues for 3 minutes (specified time) (YES in step S9), the controller 9 further inputs 200 kcal. Decrease by (specified amount) (Step S10; input-400 kca immediately before stop of proportional control)
l). If the cooling water temperature becomes 35.5 ° C. or more for less than 3 minutes, the process returns to step S2.

Further, if the state where the cooling water temperature becomes 37.5 ° C. (third monitoring temperature) or more continues for 3 minutes (specified time) or more (YES in step S14), the controller 9 further inputs 200 kcal. Decrease by (prescribed amount) (Step S15; Input-600 kc immediately before stop of proportional control)
al). The condition where the cooling water temperature becomes 37.5 ° C. or more is 3
If it is less than minutes, the process returns to step S7.

Further, if the state in which the cooling water temperature becomes 39.5 ° C. (the fourth monitoring temperature) or more continues for 3 minutes (specified time) (YES in step S20), the controller 9 further inputs 200 kcal. (Step S21; input-800 kc immediately before stop of proportional control)
al). The condition where the cooling water temperature becomes 39.5 ° C. or more is 3
If it is less than minutes, the process returns to step S12.

When the state in which the cooling water temperature becomes 41.5 ° C. (fifth monitoring temperature) or more continues for 3 minutes (specified time), the controller 9 performs a dilution operation to be described later to perform a cooling operation. To stop. If the cooling water temperature is 41.5 ° C. or more for less than 3 minutes, the process returns to step S17.

[Dilution operation] After extinguishing the gas burner 311,
The operations of the blower fan 211 and the cold / hot water pump 23 are stopped, and the operations of the combustion fan 316 and the solution pump 80 are continued (several minutes) to equalize the concentration of the absorbing solution (prevent crystallization).
Let it.

Next, advantages of the absorption type air conditioner B of this embodiment will be described. Absorption air conditioner B has a large cooling load,
The cooling operation is performed when the outside air is in a bad condition of high temperature and high humidity. When the cooling water temperature rises, the input is reduced by 200 kcal in accordance with the flowchart of FIG. If the above operation is continued (YES in step S24 in FIG. 6), the dilution operation is performed and the cooling operation is stopped, so that the following effects are obtained.

Even if the cooling load is large or the cooling operation is performed under bad conditions in which the outside air is hot and humid,
Until the above condition continues for 3 minutes or more), the cooling operation can be continued, so that the usability is good and the safety is excellent. Further, since the input is limited within a range that contributes to the cooling capacity, gas is not wasted.

The present invention includes the following embodiments in addition to the above embodiment. a. In the first and second embodiments, the absorbing liquid circuit 8 is
A regenerator in which the absorbing liquid is filled and the heating unit is heated by a heating source, a condenser heat transfer tube is provided, and a condenser in which high-temperature vapor refrigerant is sent from the regenerator during cooling operation, and liquefied by the condenser during cooling operation. An evaporator that evaporates the liquid refrigerant that has been vaporized, and the absorber heat transfer tube that is provided in parallel with the evaporator, and absorbs the vapor refrigerant evaporated by the evaporator in the high-concentration absorbent sent from the regenerator during cooling operation. It may be constituted by a vessel and a solution pump for returning the absorbent in the absorber to the regenerator (corresponding to claim 3).

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 conditioners A and B), but the structure of the absorption air conditioner is simplified. You can do it. b. The heating source may be an electric heater or the like in addition to the gas burner. c. Set temperature (31.5 ° C), m ° C (2 ° C), n-th monitored temperature (fifth monitored temperature), specified amount (200 kcal)
Can be determined arbitrarily. d. The absorption-type air conditioner may be a machine dedicated to cooling operation.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of absorption type air conditioners according to first and second embodiments 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 an operation when a cooling operation is performed under a bad condition in the absorption type air conditioner according to the first embodiment of the present invention.

FIG. 6 is a flowchart showing an operation when a cooling operation is performed under a bad condition in the absorption type air conditioner according to the second embodiment of the present invention.

[Explanation of symbols]

 A, B 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 absorption liquid) 31 Boiler (heating unit) 34 Medium Liquid (medium concentration absorption liquid) 35, 42 Steam refrigerant 41 Concentrated liquid (high concentration absorption liquid) 80 Solution pump 111 Cooling tower fan (outdoor fan) 211 Blowing fan

Claims (3)

(57) [Claims] 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 in which an indoor heat exchanger equipped with a blower fan and an evaporator heat transfer tube are connected in a loop, and a cooling / heating water pump circulates cooling / heating water, and a heating unit heated by a heating source containing an absorbing liquid and cooling operation Sometimes a high-temperature regenerator that vaporizes the refrigerant in the low-concentration absorbent and separates it into a medium-concentration liquid and a vapor refrigerant, surrounds the high-temperature regenerator, and cools the medium-concentration liquid with the high-concentration liquid 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 high-temperature vapor refrigerant is sent from each regenerator during cooling operation, and evaporation that evaporates the liquid refrigerant liquefied by the condenser during cooling operation. Vessel, An absorber that is provided in parallel with a generator and has the absorber heat transfer tube disposed therein, and in a cooling operation, absorbs the vapor refrigerant evaporated by the evaporator into a high-concentration absorbent sent from the low-temperature regenerator; and an absorbent in the absorber. An absorption liquid circuit having a solution pump for returning the cooling water to the high-temperature regenerator; and controlling the number of rotations of the outdoor fan so that a temperature of the cooling water supplied to the absorber heat transfer tube is maintained at a predetermined temperature during a cooling operation. A controller for proportionally controlling the heating power of the heating source so that the temperature of the cold / hot water supplied to the indoor heat exchanger is maintained at a set temperature. When the temperature exceeds the set temperature and the outdoor fan is at the maximum number of revolutions, the controller stops proportional control of the heating power and reduces the heating power of the heating source to the heating power immediately before the suspension. The feature is to maintain Absorption air conditioner. 2. 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 connected in a loop, and a cooling water pump circulates cooling water during cooling operation. A cooling / heating water circuit in which an indoor heat exchanger equipped with a blower fan and an evaporator heat transfer tube are connected in a loop, and a cooling / heating water pump circulates cooling / heating water, and a heating unit heated by a heating source containing an absorbing liquid and cooling operation Sometimes a high-temperature regenerator that vaporizes the refrigerant in the low-concentration absorbent and separates it into a medium-concentration liquid and a vapor refrigerant, surrounds the high-temperature regenerator, and cools the medium-concentration liquid with the high-concentration liquid 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 high-temperature vapor refrigerant is sent from each regenerator during cooling operation, and evaporation that evaporates the liquid refrigerant liquefied by the condenser during cooling operation. Vessel, An absorber that is provided in parallel with a generator and has the absorber heat transfer tube disposed therein, and in a cooling operation, absorbs the vapor refrigerant evaporated by the evaporator into a high-concentration absorbent sent from the low-temperature regenerator; and an absorbent in the absorber. An absorption liquid circuit having a solution pump for returning the cooling water to the high-temperature regenerator; and controlling the number of rotations of the outdoor fan during cooling operation so that the temperature of the cooling water supplied to the absorber heat transfer tube is maintained at a predetermined temperature. And a controller for proportionally controlling the heating power of the heating source so that the temperature of the cold and hot water supplied to the indoor heat exchanger is maintained at a set temperature. ° C) as the first monitored temperature, the second to n-th monitored temperatures are set every m ° C from the first monitored temperature, and the condition that the temperature of the cooling water is equal to or higher than the first monitored temperature is defined. After more than an hour, the controller will control the heating power. Example While stopping the control, the heating power of the heating source is reduced by a specified amount from the heating power immediately before the stop, and further, when the temperature of the cooling water is equal to or higher than the second monitoring temperature for the specified time or longer, The controller further reduces the heating power of the heating source by the specified amount, performs the reducing operation up to the (n-1) th monitoring temperature, and the temperature of the cooling water is equal to or higher than the nth monitoring temperature. When the state continues for the specified time or longer, the controller instructs the cooling operation to stop. 3. The absorbing liquid circuit is provided with a regenerator and a condenser heat transfer tube in which the absorbing liquid is filled and the heating unit is heated by the heating source, and a high-temperature vapor refrigerant is supplied from the regenerator during the cooling operation. The condenser to be sent in, the evaporator for evaporating the liquid refrigerant liquefied in the condenser during the cooling operation, the absorber heat transfer tube is provided in parallel with the evaporator, and the vapor refrigerant evaporated in the evaporator is used for the cooling operation. 2. An absorber configured to absorb the high-concentration absorbing solution sent from the regenerator, and a solution pump returning the absorbing solution in the absorber to the regenerator.
Or the absorption type air conditioner according to claim 2.