JP2002195628A - Controller for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controller for an air conditioner, which is capable of controlling cold water and hot-water pump for operation at an optimum number of revolutions, according to the length of a pipeline or the load condition of an indoor machine or the like to permit the development of cooling and heating performance or the like and contributing to saving in electric power. SOLUTION: The range of allowable number of revolution between the maximum and minimum numbers of revolution of the cold water and hot-water pump, according to the number of operating sets of indoor machines RU is set based on the heat- capacity curve of the pump while the temperature of returning cold water or hot-water from the indoor machines RU is considered with respect to the number of revolution as load information. When the temperature of returning cold or hot-water is high in cooling operation, the load of the pump is deemed that it is high and the number of revolution of the cold water and hot-water pump is increased; however, when this temperature is low, the load is deemed that it is low and the number of revolution of the pump is decreased, the number of revolution of the pump is corrected intermittently. Accordingly, the cold water and hot-water pump is controlled, so as to be operated at the optimum number of revolution in accordance with the length of the pipeline or the load condition of the indoor machines RU or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for cooling and heating, and more particularly to a control device for controlling the rotation of a cold and hot water pump for circulating cold and hot water to a heat exchanger for indoor air conditioning based on a head curve.

[0002]

2. Description of the Related Art In an absorption type air conditioner using an absorption cycle, for example, during cooling operation, refrigerant vapor is separated from a low-concentration absorption liquid boiling by heating a burner in a regenerator, and the refrigerant vapor is cooled by a condenser. Then, it is supplied to the evaporator as a refrigerant liquid. The high-concentration absorbing liquid in which the refrigerant vapor has been separated by the regenerator is supplied to the absorber. The refrigerant liquid evaporates in the evaporator to remove heat to form a cooling source, cools the cold / hot water circulating in the cold / hot water piping, and circulates the heat through the indoor air conditioning heat exchanger to cool the room. The absorbing solution is
A heat exchange pipe is provided for absorbing the refrigerant vapor in the absorber and discharging the heat generated at this time to the outside, and the exhaust heat is performed by cooling water driven by a cooling pump.

[0003] During the heating operation, a cooling / heating switching valve in an absorption liquid flow path that connects the regenerator and the evaporator is opened, and the absorption liquid heated by the burner is supplied into the evaporator, so that the cooling temperature in the evaporator is reduced. The hot and cold water passing through the water pipe is heated and circulated to the indoor air conditioning heat exchanger. A cold / hot water circulation circuit for circulating cold / hot water heated or cooled by the outdoor unit is formed between the outdoor unit serving as a heat source and the heat exchanger for indoor air conditioning, and is cooled or heated in the evaporator. The cooled and heated water is supplied to the indoor air-conditioning heat exchanger to cool or heat the room. A multi air conditioner that can install a plurality of indoor air conditioner heat exchangers as terminal devices for one outdoor unit has been commercialized.

[0004]

In the conventional apparatus described above, the setting of the number of rotations of the chilled / hot water pump is fixed depending on the number of terminal devices which are heat exchangers for indoor air conditioning. Cooling / heating water rated for air-conditioning operation or air-conditioning or antifreeze operation for cooling or heating, according to the length of the chilled / hot water pipe connecting the indoor terminal equipment) or the operating condition (load fluctuation of the indoor terminal equipment due to fluctuations in outside air temperature, etc.) The flow rate could not be secured. For this reason, although the outdoor unit has extra capacity, the original cooling / heating performance or freezing prevention performance may not be sufficiently exhibited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cooling / heating performance and an antifreezing performance according to the number of operating indoor air conditioning heat exchangers, and to contribute to a reduction in power consumption. An object of the present invention is to provide a control device for an air conditioner.

[0006]

According to the present invention, an outdoor unit having a circulation cycle for heating and cooling hot and cold water by heat exchange, and a plurality of indoor air conditioners each having an on-off valve for shutting off hot and cold water are provided. A heat exchanger is provided so as to be connectable in parallel to a heat exchange pipe arranged in the outdoor unit, and cold or hot water heated or cooled by the heat exchange pipe is circulated to the indoor air conditioning heat exchanger by a cold or hot water pump. A cold / hot water circulation circuit, and an operation control means for controlling start and stop of the cold / hot water circulation operation such as an air-conditioning operation and an anti-freezing operation, according to the number of the indoor air conditioning heat exchangers operated during the cold / hot water circulation operation. A minimum rotation speed of the cold / hot water pump is determined based on a lift curve of the cold / hot water pump, and the rotation of the cold / hot water pump is controlled within a range not less than the minimum rotation speed, and Characterized in that the cold water pump having a control unit for rotation correction in a range not lower than the minimum rotation speed based on the load information obtained from cold water returning from tuning heat exchanger.

According to the second aspect, at the time of the cold / hot water circulation operation,
An allowable rotation speed range between a maximum rotation speed and a minimum rotation speed of the cold / hot water pump is determined based on a lift curve of the cold / hot water pump in accordance with the number of operating the indoor air conditioning heat exchangers; A control unit that controls the rotation within the allowable rotation speed range and corrects the rotation of the cold and hot water pump within the allowable rotation speed range based on load information obtained from the cold and hot water returning from the indoor air conditioning heat exchanger. It is characterized by having.

According to a third aspect of the present invention, the load information obtained from the cold / hot water is a return temperature of the cold / hot water.

[0009]

According to the first aspect of the present invention, during a cold / hot water circulation operation such as an air-conditioning operation and an anti-freezing operation, the cold / hot water pump is determined based on a head curve in accordance with the number of operating indoor air conditioning heat exchangers. It is driven within a range that does not fall below the minimum rotation speed. At this time, the rotation speed of the cold / hot water pump is continuously corrected within a range not less than the minimum rotation speed based on the load information obtained from the cold / hot water returning from the indoor air-conditioning heat exchanger. For this reason, the flow rate of the cold and hot water by the cold and hot water pumps matches the number of operating air conditioner heat exchangers, the operating condition, and the installation conditions such as the length of the pipes. It can exhibit performance and anti-freezing performance. The number of operating indoor air conditioner heat exchangers is the number of ON units among the installed number during the air conditioning operation, and all the indoor air conditioner heat exchangers are O during the anti-freezing operation.
Since it is the same state as N, it becomes equal to the installed number.

[Claim 2] In the cold / hot water circulating operation such as the air-conditioning operation and the antifreezing operation, the chilled / hot water pump operates according to the number of operating indoor air-conditioning heat exchangers and the allowable rotation speed determined based on the head curve. Driven within range. At this time, the rotation speed of the chilled / hot water pump is continuously corrected within the allowable rotation speed range based on the load information obtained from the chilled / hot water returned from the indoor air conditioning heat exchanger. For this reason, the flow rate of the cold and hot water by the cold and hot water pumps matches the number of operating air conditioner heat exchangers, the operating condition, and the installation conditions such as the length of the pipes. It can exhibit performance and anti-freezing performance.

[Claim 3] By setting the load information to the cold / hot water return temperature, detection is easy and the detection device is simple, so that control is easy and the cost is low.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is applied to an absorption type air conditioner will be described with reference to the drawings. FIG. 1 shows an absorption air conditioner controlled by a control device 200,
This absorption type air conditioner is an outdoor unit 10 as an absorption type heat source device.
0 and a plurality of indoor units RU. This outdoor unit 10
Numeral 0 is composed of the heat source device main body 101 and the cooling tower CT.

The heat source unit main body 101 of the outdoor unit 100 is mainly made of stainless steel, and forms an absorption cycle for freezing a refrigerant and an aqueous solution of lithium bromide as an absorption liquid.
B is a gas burner as a heating means, 1 is a high temperature regenerator, 2
Is a low-temperature regenerator, 3 is an absorber, 4 is an evaporator, 5 is a condenser, and the absorbing solution contains an inhibitor for suppressing corrosion of lithium bromide to stainless steel.

In the high-temperature regenerator 1, the low-concentration absorbent supplied to the inside of the heating tank 11 is heated by the gas burner B, and a cylinder formed between the medium-concentration absorbent separation cylinder 12 and the absorbent partition vessel 13 is formed. When the absorption liquid heated in the absorption liquid ascending flow path 14 rises, water as a refrigerant in the low concentration absorption liquid evaporates and is separated as refrigerant vapor (water vapor). The medium-concentration absorbing liquid concentrated by evaporation of the refrigerant vapor is turned inward by the absorbing liquid return plate 15 and is absorbed by the absorbing liquid partitioning vessel 13.
Will be returned within.

The medium-concentration absorbing liquid from which the refrigerant has been separated and whose concentration has been increased is supplied to the low-temperature regenerator 2 through a medium-concentration absorbing liquid passage L1 opened to the side of the absorbing liquid partitioning vessel 13. The separated refrigerant vapor is collected by the refrigerant absorption tank 10 and supplied to the condenser 5 via the refrigerant flow path L5. In addition,
At the bottom of the absorption liquid partitioning container 13, an inlet of a cooling / heating absorption liquid flow path L4 for supplying the heated absorption liquid into the evaporator 4 during the heating operation is opened.

Inside the lower part of the refrigerant absorption tank 10, a refrigerant partitioning cylinder 17 is joined to the outer surface of the medium concentration absorbing liquid separating cylinder 12, and a heat insulating gap 17a is formed with the medium concentration absorbing liquid separating cylinder 12. are doing. For this reason, the heat in the middle concentration absorption liquid separation cylinder 12 is shut off, and the refrigerant in the refrigerant absorption tank 10 is not heated by the high-temperature absorption liquid in the absorption liquid ascending flow path 14. The outside of the refrigerant partitioning tube 17 in the refrigerant absorption tank 10 is a refrigerant storage portion 10a for storing the separated liquid refrigerant, and the refrigerant stored in the refrigerant storage portion 10a is supplied to the condenser 5 via the refrigerant flow path L5. Supplied to

In the low-temperature regenerator 2, the medium-concentration absorbent supplied through the medium-concentration liquid flow path L 1 passing through the heat exchanger H flows in from the ceiling of the low-temperature regenerator case 20, The outer wall 10 is reheated using the heat source as a heat source, and separated into a refrigerant vapor and a high-concentration absorbent by the gas-liquid separator 22. The refrigerant vapor is supplied from the refrigerant vapor outlet 21 and the gap 5A into the condenser case 50, and the high-concentration absorbing liquid is stored in the high-concentration absorbing liquid receiving section 23, and the high-concentration absorbing liquid flow path L2
Is supplied to the absorber 3 via the.

An orifice (not shown) for restricting the flow rate of the medium-concentration absorbing liquid flowing from the absorbing-liquid partition vessel 13 to the low-temperature regenerator 2 is provided in the medium-concentration absorbing liquid passage L1. The medium-concentration absorbent is supplied into the regenerator 2 by a pressure difference from the medium-concentration absorbent separation cylinder 12. For this reason,
The pressure in the low-temperature regenerator case 20 is about 70 mmHg, and the pressure in the medium-concentration absorbent separation tube 12 is about 700 mmHg.

The absorber 3 has an absorption coil 31 in which a copper tube is wound in a vertical cylindrical shape in an evaporation / absorption case 30 and the inside of which is coiled as an absorption tube through which cooling water for exhaust heat flows. are doing. The high-concentration absorbent supplied from the high-concentration absorbent receiving section 23 of the low-temperature regenerator 2 flows into the upper end of the absorption coil 31 via the high-concentration absorbent flow path L2 due to a pressure difference. It is sprayed by the spraying tool 32. The high-concentration absorbent thus sprayed adheres in a thin film form on the surface of the absorption coil 31, flows down by the action of gravity, absorbs water vapor, and becomes a low-concentration absorbent. When absorbing the water vapor, the surface of the absorption coil 31 generates heat, but is cooled by the cooling water for exhaust heat circulating in the absorption coil 31. Note that the water vapor absorbed by the high-concentration absorbent is generated as refrigerant vapor in an evaporator 4 described later.

The low-concentration absorbent in the absorber 3 is supplied from the bottom 33 to the heating tank 11 via the heat exchanger H and the low-concentration absorbent flow path L3 provided with the absorbent pump P1 by the operation of the absorbent pump P1. Return inside. Further, in the absorption coil 31, the cooling water for exhaust heat cooled by the cooling tower CT during the cooling operation circulates through the cooling coil 51 of the condenser 5.

The evaporator 4 is provided on the outer periphery of a vertical cylindrical partition plate 40 provided with a plurality of communication ports (not shown) provided on the outer periphery of the absorption coil 31 in the evaporator / absorber case 30. A vertical cylindrical evaporating coil 41 composed of a copper tube through which cold and hot water flows is disposed, and a refrigerant liquid dispersing tool 42 is mounted above the evaporating coil 41. The bottom 43 of the evaporator 4 communicates with the bottom of the absorbent partitioning vessel 13 in the medium-concentration absorbent separation cylinder 12 by a cooling / heating absorbent flow path L4 having an electromagnetic cooling / heating switching valve 6.

In the evaporator 4 during the cooling operation, when the liquid refrigerant (water) is caused to flow down onto the evaporating coil 41 by the refrigerant liquid spraying tool 42, the flowing refrigerant liquid wets the surface of the evaporating coil 41 due to surface tension. The air-conditioner flows through the evaporating coil 41 by evaporating the evaporating coil 41 from the evaporating coil 41 in the evaporating / absorbing case 30 at a low pressure (for example, 6.5 mmHg) while falling under the action of gravity. Cool hot and cold water.

In a condenser case 50 of the condenser 5, a dish-shaped refrigerant liquid receiver for receiving refrigerant liquid liquefied by cooling the refrigerant vapor by the cooling coil 51 at a position away from the bottom of the condenser case 50. A part 52 is provided. The coolant receiver 52 is located above the coolant sprayer 42 of the evaporator 4 and communicates with the coolant cooler 53 that cools the coolant by self-cooling of the coolant supplied, and the coolant supply path L6. It is provided to be.

The condenser 5 communicates with the refrigerant storage section 10a of the refrigerant recovery tank 10 through a refrigerant flow path L5 provided with an orifice (not shown) for restricting the flow rate of the refrigerant, and has a refrigerant vapor outlet 21 and a gap. The refrigerant is also communicated with the low-temperature regenerator 2 through 5A, and the refrigerant is supplied by a pressure difference (about 70 mmHg in the condenser case 50). The refrigerant vapor supplied to the condenser case 50 during the cooling operation is cooled and liquefied by the cooling coil 51, and is supplied from the refrigerant liquid receiving section 52 to the refrigerant cooler 53 via the refrigerant liquid supply path L6. The refrigerant liquid that has overflowed from the refrigerant liquid receiving section 52 is stored in a refrigerant liquid storage section 54 formed by the inner bottom of the condenser case 50, and the refrigerant liquid that circulates through an absorption cycle to ensure cooling performance during cooling operation. The concentration is kept substantially high. The refrigerant liquid storage section 54 and the refrigerant cooler 53 are in communication with each other through a refrigerant liquid supply path L7 provided with a refrigerant valve 7. The liquid is supplied to the evaporator 4 and the evaporator 4
Freezing is prevented by increasing the internal vapor pressure.
The refrigerant valve 7 is also opened at the start of the heating operation, and all the refrigerant liquid stored in the refrigerant liquid storage unit 54 is supplied into the evaporator 4 during the cooling operation, and the absorbing liquid heated and circulated during the heating operation is discharged. The concentration is kept low to prevent crystallization.

During the cooling operation, the absorbing liquid is supplied to the high-temperature regenerator 1 → the medium-concentration absorbing liquid path L1 → the high-concentration absorbing liquid path L2 → the high-concentration absorbing liquid sprayer 32 → the absorber 3 → the absorbing liquid pump P1 →
It circulates in the order of the low concentration absorbent flow path L3 and the high temperature regenerator 1.
The refrigerant is a high temperature regenerator 1 (refrigerant vapor) → refrigerant flow path L5
(Refrigerant vapor) or low-temperature regenerator 2 (refrigerant vapor) → condenser 5 (refrigerant liquid) → refrigerant liquid supply path L6 (refrigerant liquid) or refrigerant liquid supply path L7 (refrigerant liquid) → refrigerant cooler 53 → refrigerant liquid dispersion Fixture 42 (refrigerant liquid) → evaporator 4 (refrigerant vapor) → absorber 3
(Absorbent) → Absorbent pump P1 → Low concentration absorbent flow path L3
→ Circulate in the order of high temperature regenerator 1.

The absorption coil 31 of the absorber 3, which exchanges heat with the absorption liquid, and the cooling coil 51 of the condenser 5 are connected to form a continuous coil. This continuous coil is connected to the cooling water passage 3
The cooling water circulation passage 4 is connected to the cooling tower CT. In this cooling water circuit, the absorption coil 31
The cooling water flow path 34 existing between the inlet of the cooling tower CT and the cooling tower CT has a cooling water pump P2 for sending cooling water into the continuous coil.
Is provided. By the operation of the cooling water pump P2, the cooling water passing through the continuous coil deprives the absorbing coil 31 of the absorption heat, and the condensing heat is obtained by the cooling coil 51 to be relatively high in temperature and supplied to the cooling tower CT.

During the cooling operation, the cooling water pump P
By the operation of 2, the cooling water in the cooling tower CT is circulated in the order of the cooling tower CT, the cooling water pump P2, the absorption coil 31, the cooling coil 51, and the cooling tower CT, while the evaporation of the cooling water in the cooling tower CT is promoted. In the cooling tower CT, the falling cooling water is partially evaporated into the atmosphere. For this reason, the cooling water releases heat to the atmosphere, forming a waste heat cycle in which the temperature becomes low. The evaporator coil 41 of the evaporator 4 includes an indoor unit RU.
Is connected by a cold / hot water flow path 47, and the cold / hot water pump P
3 are provided.

Each indoor unit RU is provided with a blower 46 for passing indoor air through the air-conditioning heat exchanger 44 and blowing the indoor air again. The cold / hot water flow path 47 on the downstream side of the air conditioning heat exchanger 44 of each indoor unit RU is provided with a motor-driven open / close valve 48, and is operated in response to an operation signal of a remote controller provided in each indoor unit RU. Only the on-off valves 48 provided for the indoor units RU whose operation has been instructed are driven to open, and the on-off valves 48 of the other indoor units RU remain closed. The indoor unit RU is provided with a cold / hot water inlet thermistor 49 for detecting the temperature of the cold / hot water in the cold / hot water pipe upstream of the air conditioning heat exchanger 44. Then, the cold / hot water having a low temperature in the evaporating coil 41 is converted into the evaporating coil 41 → the cold / hot water flow path 47 → the air-conditioning heat exchanger 44 → the cold / hot water flow path for the indoor unit RU whose opening / closing valve 48 is driven to open. The circulation is performed in the order of 47 → cold / hot water pump P3 → evaporation coil 41.

The heating absorbent flow path L4 and the cooling / heating switching valve 6 are provided for heating. During the heating operation, the cooling / heating switching valve 6 is opened to operate the absorbing pump P1. As a result, the high-temperature medium-concentration absorbing liquid in the absorbing liquid partitioning vessel 13 in the medium-concentration absorbing liquid separating cylinder 12 flows into the evaporator 4, and is evaporated by the high-temperature vapor (refrigerant vapor) of the medium-concentration absorbing liquid The cold and hot water inside is heated. The heated hot / cold water in the evaporating coil 41 is supplied from the cold / hot water flow path 47 to the air-conditioning heat exchanger 44 by the operation of the cold / hot water pump P3, and serves as a heat source for heating. The medium concentration absorbent in the evaporator 4 enters the absorber 3 through the communication port of the partition plate 40, and returns to the heating tank 11 by the absorbent pump P1 via the low concentration absorbent flow path L3.

In the absorption type air conditioner of this embodiment configured as described above, the absorption liquid pump P1 for circulating the absorption liquid in the absorption cycle, and the cold or hot water cooled or heated by the evaporation coil 41 are supplied to the cold or hot water flow. The chilled / hot water pump P3 for circulating to the air conditioner heat exchanger 44 of the indoor unit RU by the path 47 is driven by a separate independent motor.

Next, the control operation of the control device 200 for controlling the absorption type air conditioner will be described. Control device 200
Are the combustion control of the gas burner B, the rotation control of the absorption liquid pump P1 and the cold / hot water pump P3, the rotation control of the water recirculation pump P2, the rotation control of the blower S of the cooling tower CT, the valves 6 provided in the absorption cycle, 7, the cooling operation and the heating operation of the absorption type air conditioner are controlled, and the freezing prevention is performed to prevent the freezing of the hot and cold water in the hot and cold water flow path 47 connecting the outdoor unit 100 and the indoor unit RU. Driving.

In this case, during the cooling operation, the allowable rotation speed range (rpm) from the minimum rotation speed to the maximum rotation speed of the cold / hot water pump P3 as shown in Table 1 depends on the number of operating indoor units RU, that is, the number of operating air conditioning heat exchangers 44. ) And the target cold / hot water return temperature (T ° C.) from the air conditioning heat exchanger 44. At this time, a method of detecting the cold / hot water return temperature (T ° C.) as information of the cold / hot water passing through the air-conditioning heat exchanger 44 and controlling the rotation speed of the cold / hot water pump P3 so as to reach the target cold / hot water return temperature. Although the flow rate and the flow velocity of the cold and hot water are detected, the number of rotations may be controlled so as to reach the target value.

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

[Table 3]

Table 1 shows the case of the cooling operation, which is 6.7 kW.
As shown in FIG. 3, the outdoor unit 1
It is based on a head curve assuming a case where the length of the cold / hot water pipe connecting the 00 and the indoor unit RU is the maximum, and is created in consideration of the pressure loss of the pipe and the discharge amount of the cold / hot water. In FIG. 3, the areas occupied by the marks ◆, ■, and ▲ determine the ranges of the heads that can secure the required discharge amounts when the number of indoor units RU is one, two, and three, respectively. , The allowable rotation speed range of the cold / hot water pump P3 is set. In this case, the minimum number of revolutions is set so that the flow rate of cold and hot water required for cooling can be secured in all the indoor units RU during operation.

Similarly, Table 2 shows the case of the heating operation, which is accompanied by the floor heating operation, and the allowable rotation speed range (rpm) from the minimum rotation speed to the maximum rotation speed of the chilled / hot water pump P3 depending on the number of operating indoor units RU. ) And the target cold / hot water return temperature (T ° C.) from the air conditioning heat exchanger 44. In this case, the minimum number of revolutions (rpm) is set so that the flow rate of the hot and cold water required for heating can be secured in all the indoor units RU during operation. Further, Table 3 shows an allowable rotation speed range from the minimum rotation speed to the maximum rotation speed of the cold / hot water pump P3 according to the number of operating indoor units RU (equal to the number of installed units) based on the flow rate of the cold / hot water required during the antifreeze operation. (Rpm) and the target cold / hot water return temperature (T ° C.) from the air conditioning heat exchanger 44. Also in this case, the allowable rotation speed range (rpm) and the target cold / hot water return temperature (T ° C.) can be obtained based on the head curve as in the cooling operation.

[Cooling operation] In the cooling operation, the cooling / heating switching valve 6 is closed and absorbed by a user in response to an instruction to start the cooling operation from a remote controller (not shown) located in the room where the indoor unit RU is installed. The driving of the liquid pump P1 and the cold / hot water pump P3 is started, and the operation is performed by the combustion of the gas burner B. Then, when a request signal for cooling operation is transmitted from the remote controller, as shown in FIG.
Is determined (step 10), and if the number of operating indoor units RU is one (YE in step 11).
S), the inverter controlling the DC motor of the chilled / hot water pump P3 is controlled (step 12), and the rotation speed of the chilled / hot water pump P3 is driven at a rotation speed between 2550 and 3600 rpm to secure a required head and flow rate. I do. On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor (not shown). If the return temperature of the cold / hot water is higher than the target cold / hot water return temperature of 14 ° C., the amount of current supplied to the DC motor of the cold / hot water pump P3 is increased by the instruction signal. If it is lower than the target cold / hot water return temperature of 14 ° C., the number of rotations of the cold / hot water pump P3 is reduced so that the amount of current supplied to the DC motor of the cold / hot water pump P3 is reduced to 14 ° C. Is continuously corrected within the rotation speed range of 2550 to 3600 rpm. Note that the minimum rotation speed is 2550 rpm
Even if it is set to m, if the target cold / hot water return temperature is lower than 14 ° C., the minimum rotation speed is set to 2550 rpm, and the head and flow rate are secured.

If the number of operating indoor units RU is not one (NO in step 11), it is determined whether or not the number of operating indoor units RU is two (step 13).
If the number of operating vehicles is two (YE
S), the inverter controlling the DC motor of the cold / hot water pump P3 is controlled (step 14), and the rotation speed of the cold / hot water pump P3 is driven at a rotation speed between 2850 and 4350 rpm. On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. When the return temperature of the cold / hot water is higher than the target cold / hot water return temperature of 14 ° C., the amount of power to the DC motor of the cold / hot water pump P3 is increased by the instruction signal, and the return temperature of the cold / hot water is If it is lower than the target cold / hot water return temperature of 14 ° C., the number of rotations of the cold / hot water pump P3 is reduced so that the amount of current supplied to the DC motor of the cold / hot water pump P3 is reduced to 14 ° C. Is continuously corrected within the rotation speed range of 2850-4350 rpm. In addition, the minimum rotation speed 2
Even if set to 850 rpm, target cold / hot water return temperature of 14 ° C
If the rotation speed is lower than the minimum rotation speed, the minimum rotation speed is set to 2850 rpm, and the head and flow rate are secured.

When the number of operating indoor units RU is not two (NO in step 13), since the number of operating indoor units RU is three or more, the inverter for controlling the DC motor of the chilled / hot water pump P3 is controlled. Then, the rotation speed of the cold / hot water pump P3 is driven at a rotation speed between 3450 and 4800 rpm (step 15). On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. When the return temperature of the cold / hot water is higher than the target cold / hot water return temperature of 14 ° C., the amount of power to the DC motor of the cold / hot water pump P3 is increased by the instruction signal, and the return temperature of the cold / hot water is The target cold / hot water return temperature is 1
If the temperature is lower than 4 ° C., the amount of electricity supplied to the DC motor of the chilled / hot water pump P3 is reduced so that the return temperature of the chilled / hot water becomes 14 ° C.
° C, the rotation speed of the cold / hot water pump P3 is set to 3450.
The rotation speed is continuously corrected within the rotation speed range of ４4800 rpm. Even if the minimum rotation speed is set at 3450 rpm, if the target cold / hot water return temperature is lower than 14 ° C., 3
The minimum rotation speed is set to 450 rpm, and the head and flow rate are secured.

[Heating Operation] In the heating operation, the cooling / heating switching valve 6 is opened in response to an instruction from the user to start the heating operation by a remote controller (not shown) located in the room where the indoor unit RU is installed, and absorption is performed. The driving of the liquid pump P1 and the cold / hot water pump P3 is started, and the operation is performed by the combustion of the gas burner B. In addition, in this absorption type air conditioner, as shown in FIG. 8, the outdoor unit 100 is configured to be able to supply cold and hot water to the floor heating panel 300. For this reason, the control device 200 determines whether or not the floor heating panel 300 is installed based on the presence or absence of an operation signal from a floor heating panel remote controller (not shown) separately provided on the floor heating panel 300. Then, each control is performed based on the result.

When a request signal for a heating operation is sent from the remote controller, it is determined whether or not the signal is a floor heating operation signal from the floor heating panel remote controller, as shown in FIG. If the operation is the floor heating operation (YES in step 16), the inverter that controls the DC motor of the chilled / hot water pump P3 is controlled regardless of the number of floor heating panels 300 (step 17).
The number of rotations of the cold / hot water pump P3 is 3600-4800 rpm
Drive at the rotation speed between to secure a large head and flow rate.
On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. When the return temperature of the cold and hot water is higher than the target cold and hot water return temperature of 55 ° C., the amount of power to the DC motor of the cold and hot water pump P3 is reduced by the instruction signal, and the return temperature of the cold and hot water becomes When the temperature is lower than the target cold / hot water return temperature of 55 ° C., the number of rotations of the cold / hot water pump P3 is increased by increasing the amount of current supplied to the DC motor of the cold / hot water pump P3 so that the cold / hot water return temperature becomes 55 ° C. Is continuously corrected within the rotation speed range of 3600 to 4800 rpm. The minimum rotation speed 36
If the detected temperature is higher than the target cold / hot water return temperature of 55 ° C. even if it is reduced to 00 rpm, the minimum rotation speed is set to 3600 rpm to secure the head and flow rate.

If the signal is not the floor heating operation signal (step 1
6), it is determined whether the number of indoor units RU to be heated is one (step 18). If the number of indoor units RU is one (YES in step 19), the cooling / heating water pump P3 is turned on. The inverter controlling the DC motor is controlled (step 20), and the rotation speed of the cold / hot water pump P3 is driven within the rotation speed range between 2250 and 3300 rpm. On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. If the return temperature of the chilled / hot water is higher than the target chilled / hot water return temperature of 50 ° C., the amount of power to the DC motor of the chilled / hot water pump P3 is reduced by the instruction signal. If the temperature is lower than the target cold / hot water return temperature of 50 ° C., the number of rotations of the cold / hot water pump P3 is increased so that the amount of power supplied to the DC motor of the cold / hot water pump P3 is increased to 50 ° C. Is continuously corrected within the rotation speed range of 2250 to 3300 rpm. In addition, the minimum rotation speed 2
If the detected temperature is higher than the target cold / hot water return temperature of 50 ° C. even if the temperature is reduced to 250 rpm, the minimum rotation speed is set to 2250 rpm to secure the head and flow rate.

If the number of operating indoor units RU is not one (NO in step 19), it is determined in step 21 whether the number of operating indoor units RU is two. If the number of operating vehicles is two (YES in step 21),
By controlling the inverter (step 22), the rotation speed of the cold / hot water pump P3 is driven within the rotation speed range of 2550 to 3990 rpm. On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor.
The return temperature of the cold / hot water is a target cold / hot water return temperature of 5
If the temperature is higher than 0 ° C., the amount of power to the DC motor of the cold / hot water pump P3 is reduced by the instruction signal. If the return temperature of the cold / hot water is lower than the target cold / hot water return temperature of 50 ° C., The number of rotations of the cold / hot water pump P3 is increased to 2550 to 3990 so that the amount of current supplied to the DC motor of the cold / hot water pump P3 is increased so that the return temperature of the cold / hot water becomes 50 ° C.
The correction is continuously performed within the rotation speed range of rpm. If the detected temperature is higher than the target cold / hot water return temperature of 50 ° C. even when the rotational speed is reduced to the minimum rotational speed of 2550 rpm,
pm minimum speed to ensure head and flow.

If the number of operating indoor units RU is not two (NO in step 21), since the number of operating indoor units RU is three or more, the inverter for controlling the DC motor of the chilled / hot water pump P3 is controlled. Then, the rotation speed of the cold / hot water pump P3 is driven at a rotation speed between 3150 and 4350 rpm (step 23). On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. If the return temperature of the chilled / hot water is higher than the target chilled / hot water return temperature of 50 ° C., the amount of power to the DC motor of the chilled / hot water pump P3 is reduced by the instruction signal. Target cold / hot water return temperature of 5
If the temperature is lower than 0 ° C., the amount of current supplied to the DC motor of the cold / hot water pump P3 is increased so that the return temperature of the cold / hot water becomes 50 ° C.
° C, the rotation speed of the cold / hot water pump P3 is set to 3150.
The correction is continuously performed within the rotation speed range of ４３4350 rpm.
If the detected temperature is higher than the target cold / hot water return temperature of 50 ° C. even when the rotation speed is reduced to the minimum rotation speed of 3150 rpm,
Set to the minimum rotation speed of 3150 rpm to secure the head and flow rate.

In this heating operation, the combustion amount control of the gas burner B is adjusted based on the cold / hot water temperature Tw detected by the cold / hot water inlet thermistor 49 provided in the cold / hot water passage 47 at the inlet of the indoor unit RU. You. This cold and hot water temperature Tw
To be approximately 60 ° C. (3200 kcal / h)
(8000 kcal / h), the input of gas burner B is controlled by a gas proportional valve. During this time, the indoor unit R
In U, the rotation speed of the blower 46 is controlled according to the room temperature. In this case, in the cooling water flow path 34, neither the cooling water pump P2 nor the blower S is driven, and a drain valve (not shown) provided in the cooling water circuit is opened to open all the cooling water circuits. Drain water.

The above cooling / heating operation is performed when the input is within the proportional control range.
Is controlled by the maximum number of rotations of the cold / hot water pump P3 according to the number of operating pumps. The same applies when the cold / hot water is operated at a higher temperature than usual or during test operation. Also, when the outlet temperature of the cold / hot water drops to 5 ° C. or less, the cold / hot water pump P3 is not subjected to the above control, and maintains the rotation speed at that time.

[Anti-freezing operation] The anti-freezing operation is for preventing the cold / hot water in the cold / hot water flow path 47 from freezing in a cold season or the like, and is performed when the cooling operation or the heating operation is not performed. That is, during the cooling operation or the heating operation, it is determined that there is no possibility that the cold / hot water in the cold / hot water flow path 47 is frozen, and the antifreeze operation is not performed.

When neither the cooling operation nor the heating operation is performed, it is determined whether the outside air temperature detected by the outside air temperature thermistor 201 provided in the outdoor unit 100 is 3 ° C. or less and -5 ° C. or more. . When the outside air temperature is higher than 3 ° C., the operation waits without performing the antifreezing operation. Then, as shown in FIG. 6, when it is determined that the outside air temperature is 3 ° C. or less and −5 ° C. or more (Y in step 24).
ES), the cooling / heating switching valve 6 is opened to perform the anti-freezing control, and the cooling / heating water pump P3 is driven to drive each indoor unit R
The on-off valves 48 provided on U are respectively opened. In this anti-freezing operation, the number of rotations of a cold / hot water pump P3 described later is controlled in accordance with the number of indoor units RU connected to the outdoor unit 100. Thereby, since the cold and hot water circulates in the cold and hot water flow path 47 including the indoor unit RU, the freezing of the cold and hot water can be prevented by the flow of the cold and hot water.

If the outside air temperature becomes higher than 3 ° C. during the anti-freezing operation (NO in step 24 and step 31 shown in FIG. 7), the cooling / heating switching valve 6 is closed and the cold / hot water pump P3 is closed. Is stopped to stop the cold / hot water pump P3, and the on-off valves 48 provided in the respective indoor units RU are closed.

Next, when performing the anti-freezing operation, the control device 200 determines the number of operating indoor units RU in step 25, and if the number of operating indoor units RU is one (YES in step 26), the control unit 200 sets the cooling temperature. The inverter controlling the water pump P3 is controlled, and the cold / hot water pump P3 is set to 2250-2.
Drive within the rotation speed range of 400 rpm (step 2
7). On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. 1 ℃ <T
In the case of, the amount of power to the DC motor of the chilled / hot water pump P3 is reduced by the instruction signal, and the rotation speed of the chilled / hot water pump P3 is corrected so as to approach 2250 rpm, which is the lower limit of the allowable rotation speed range. When 0 ° C <T ≦ 1 ° C,
The amount of current supplied to the DC motor of the chilled / hot water pump P3 is increased, and the rotation speed of the chilled / hot water pump P3 is continuously corrected so as to approach 2400 rpm, which is the upper limit of the allowable rotation speed range. Even if the rotation speed is set to 2250 rpm, which is the lower limit, if 1 ° C. <T, the lower rotation speed of 2250 rpm is maintained, and the head and flow rate are secured.

If the number of operating indoor units RU is two (NO in step 26), the result in step 28 is YES, the process proceeds to step 29, and the cold / hot water pump P
3 is controlled to drive the cold / hot water pump P3 within a rotation speed range of 2550 to 2700 rpm.
On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. If 1 ° C. <T, the amount of power to the DC motor of the chilled / hot water pump P3 is reduced by the instruction signal, and the rotation speed of the chilled / hot water pump P3 is corrected so as to approach 2550 rpm, which is the lower limit of the allowable rotation speed range. . When 0 ° C. <T ≦ 1 ° C., the amount of current supplied to the DC motor of the chilled / hot water pump P3 is increased so that the rotation speed of the chilled / hot water pump P3 approaches 2700 rpm, which is the upper limit of the allowable rotation speed range. Is corrected.
Even if the rotation speed is set to the lower limit of 2550 rpm, if 1 ° C. <T, the lower limit of the rotation speed of 2550 rpm is maintained, and the head and flow rate are secured.

If the number of operating indoor units RU is not two (NO in step 28), the number of operating indoor units RU is three or more. In this step 30, the inverter controlling the cold / hot water pump P3 is controlled to change the cold / hot water pump P3 from 2700 to 2850.
Drive within the rpm range. On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. If 1 ° C. <T, the amount of power to the DC motor of the chilled / hot water pump P3 is reduced by the instruction signal, and the rotation speed of the chilled / hot water pump P3 is corrected so as to approach 2700 rpm, which is the lower limit of the allowable rotation speed range. . When 0 ° C. <T ≦ 1 ° C., the amount of power supplied to the DC motor of the chilled / hot water pump P3 is increased so that the rotation speed of the chilled / hot water pump P3 approaches 2850 rpm, which is the upper limit of the allowable rotation speed range. Is corrected. Even if the lower limit is set to 2700 rpm, if 1 ° C <T, the lower limit of 2700 rpm is maintained, and
Flow rate is ensured.

Further, the outside air temperature further decreases, and t <−5.
° C, YE in step 31 of FIG.
In step S32, the number of operating indoor units RU is determined in step 32. If the number of operating indoor units RU is one (YES in step 33), an inverter that controls the chilled / hot water pump P3 is controlled, and the chilled / hot water pump is controlled. P3 2400
Drive within the rotation speed range of 2550 rpm (step 3
4). On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. 1 ℃ <T
In the case of, the amount of power to the DC motor of the chilled / hot water pump P3 is reduced by the instruction signal, and the rotation speed of the chilled / hot water pump P3 is corrected so as to approach 2400 rpm, which is the lower limit of the allowable rotation speed range. When 0 ° C <T ≦ 1 ° C,
The amount of power supply to the DC motor of the chilled / hot water pump P3 is increased, and the rotation speed of the chilled / hot water pump P3 is continuously corrected so as to approach 2550 rpm which is the upper limit of the allowable rotation speed range. In addition, even if it is set to 2400 rpm which is the lower limit of the number of revolutions, when 1 ° C <T, the lower limit of the number of revolutions of 2400 rpm is maintained, and the head and flow rate are secured.

If the number of operating indoor units RU is two (NO in step 33), the result in step 35 is YES, the process proceeds to step 36, and the cold / hot water pump P
3 is driven to drive the cold / hot water pump P3 within the rotation speed range of 2700 to 2850 rpm.
On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. If 1 ° C. <T, the amount of power to the DC motor of the chilled / hot water pump P3 is reduced by the instruction signal, and the rotation speed of the chilled / hot water pump P3 is corrected so as to approach 2700 rpm, which is the lower limit of the allowable rotation speed range. . When 0 ° C. <T ≦ 1 ° C., the amount of power supplied to the DC motor of the chilled / hot water pump P3 is increased so that the rotation speed of the chilled / hot water pump P3 approaches 2850 rpm, which is the upper limit of the allowable rotation speed range. Is corrected.
Even if the rotation speed is set to the lower limit of 2700 rpm, if 1 ° C. <T, the lower limit of the rotation speed of 2700 rpm is maintained, and the head and flow rate are secured.

If the number of operating indoor units RU is not two (NO in step 35), the number of operating indoor units RU is three or more. In this step 37, the inverter for controlling the cold / hot water pump P3 is controlled so that the cold / hot water pump P3 is set at 2850-3000.
Drive within the rpm range. On the other hand, the return temperature of cold / hot water (T ° C.) from the air-conditioning heat exchanger 44 is detected by a thermistor. If 1 ° C. <T, the amount of power to the DC motor of the chilled / hot water pump P3 is reduced by the instruction signal, and the rotation speed of the chilled / hot water pump P3 is corrected so as to approach 2850 rpm, which is the lower limit of the allowable rotation speed range. . When 0 ° C. <T ≦ 1 ° C., the amount of current supplied to the DC motor of the chilled / hot water pump P3 is increased so that the rotation speed of the chilled / hot water pump P3 approaches the upper limit of the allowable rotation speed range of 3000 rpm. Is corrected. Even if the lower limit is set to 2850 rpm, if 1 ° C <T, the lower limit of 2850 rpm is maintained, and the
Flow rate is ensured.

In the cooling and heating operation and the anti-freezing operation, the rotation control and the correction are performed within the allowable rotation speed range between the maximum rotation speed and the minimum rotation speed of the chilled / hot water pump P3. And rotation control and correction can be performed within a range not less than the minimum rotation speed. The target cold / hot water return temperature may be classified according to the number of operating units. For example, in the case of the cooling operation, the lower the number, the higher the number.

As described above, in the present invention, the indoor unit R
The allowable rotation speed range of the chilled / hot water pump P3 according to the number of operating U units is set based on the lift curve, and in setting the rotation speed, information on the chilled / hot water returned from the indoor unit RU is taken into consideration. The rotational speed is changed by judging the load of the motor. As described above, by setting the rotation speed of the cold / hot water pump P3 according to the load of the indoor unit RU obtained from information from the cold / hot water such as the hot / cold water return temperature, each operation of the cold / hot water pump P3 such as a cooling / heating operation is performed. The rotation speed can be controlled to an appropriate value according to the state, and the cooling / heating performance and the antifreezing performance can be exhibited, and the power consumption can be reduced.

In the above embodiment, the present invention is applied to an absorption type air conditioner. However, the present invention can be applied to general air conditioners which perform cooling and heating using cold and hot water as a working fluid.

In the above embodiment, the indoor unit RU is provided with only the air conditioning heat exchanger 44. However, in order to perform the dehumidifying operation without lowering the indoor temperature, the air conditioning heat exchanger 44 is provided.
A heating heat exchanger for heating the air once cooled may be arranged in parallel with the air conditioning heat exchanger 44. Further, the double-effect type has been described, but a single-effect type may be used. Further, as a heating source, a kerosene burner, a petroleum burner or an electric heater may be used instead of the gas burner.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an absorption type air conditioner according to one embodiment of the present invention.

FIG. 2 is a schematic longitudinal sectional view of an outdoor unit according to one embodiment of the present invention.

FIG. 3 shows a head curve of a chilled / hot water pump in an absorption type air conditioner according to an embodiment of the present invention.

FIG. 4 is a flowchart of a chilled / hot water pump control operation during a cooling operation in the control device according to the embodiment of the present invention.

FIG. 5 is a flowchart of a chilled / hot water pump control operation during a heating operation in the control device of one embodiment of the present invention.

FIG. 6 is a flowchart of control of an antifreeze operation in the control device according to the embodiment of the present invention.

FIG. 7 is a flowchart of control of an antifreeze operation in the control device according to the embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of an absorption type cooling and heating apparatus according to another embodiment of the present invention.

[Description of Signs] 1 High-temperature regenerator 2 Low-temperature regenerator 3 Absorber 4 Evaporator 5 Condenser 6 Cooling / heating switching valve 41 Evaporation coil (piping for heat exchange) 44 Heat exchanger for air conditioning 47 Cooling / heating water flow path (cooling / heating water circulation circuit) 48 On-off valve 54 Refrigerant liquid reservoir B Gas burner (heating means) L4 Cooling / heating absorbing liquid flow path P1 Absorbing liquid pump P3 Cooling / heating water pump RU Indoor unit 100 Outdoor unit 101 Heat source unit main unit (absorption type heat source unit) 200 Control unit (control) Section, operation control means, cold / hot water freezing prevention means) 201 outside air temperature thermistor (outside air temperature detection means) 300 floor heating panel

Continuation of front page (72) Inventor Shinji Kuroda 2-26, Fukuzumicho, Nakagawa-ku, Nagoya-shi Rinnai Co., Ltd. (72) Inventor Kaoru Kawamoto 4-1-2, Hiranocho, Chuo-ku, Osaka-shi Osaka Gas Co., Ltd. (72) Inventor Tohru Fukuchi 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi F term in Osaka Gas Co., Ltd.

Claims (3)

[Claims] 1. An outdoor unit having a circulation cycle for heating and cooling hot and cold water by heat exchange, and a plurality of indoor air conditioning heat exchangers each having an on-off valve for shutting off hot and cold water are arranged in the outdoor unit. A cold / hot water circulation circuit for circulating cold / hot water heated or cooled by the heat exchange pipe to the indoor air-conditioning heat exchanger with a cold / hot water pump, Operation control means for controlling start and stop of the cold / hot water circulation operation such as an anti-freezing operation, and the cold / hot water circulation operation is based on a head curve of the cold / hot water pump according to the number of operating indoor air conditioning heat exchangers. Determining the minimum rotation speed of the cold / hot water pump, and controlling the rotation of the cold / hot water pump within a range not less than the minimum rotation speed, and controlling the cold temperature returned from the indoor air conditioning heat exchanger. Control device for an air conditioning apparatus, characterized in that the cold and hot water pump based on the load information obtained having a control unit for rotation correction in a range not lower than the minimum rotation speed from. 2. The method according to claim 1, wherein the circulating operation of the chilled / hot water pump is performed between a maximum rotating speed and a minimum rotating speed of the chilled / hot water pump based on a lift curve of the chilled / hot water pump according to the number of operating indoor heat exchangers. Determine an allowable rotation speed range, control the rotation of the cold / hot water pump within the allowable rotation speed range, and allow the cold / hot water pump to perform the allowable rotation based on load information obtained from the cold / hot water returning from the indoor air conditioning heat exchanger. The control device for an air conditioner according to claim 1, further comprising a control unit that corrects rotation within a rotation speed range. 3. The control device for an air conditioner according to claim 1, wherein the load information obtained from the cold / hot water is a return temperature of the cold / hot water.