JP2003042589A - Absorptive cooling and heating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the supercooling of an evaporator and eliminate the trouble in cooling operation, when a load from the side of an indoor terminal machine is very small upon cooling operation and cooling operation stopping process or the like during the cooling operation, or when cold start is effected under a condition that a feed water temperature is low, in an absorptive cooling and heating machine. SOLUTION: The temperature of the evaporator 4 is detected by a first thermistor Tf upon cooling operation and cooling operation stopping process or the like during the cooling operation. The temperature of the evaporator 4 is judged based on an output from the first thermistor Tf whether the same is lower than 3 deg.C or not. When the temperature is lower than 3 deg.C, both or either one of a cooling tower fan S or a cooling water pump P2 is stopped. When the temperature of the evaporator 4 is raised to a value higher than 7 deg.C, the operation of both or either one of the cooling tower fan S or the cooling water pump P2 is re-started. According to this method, the supercooling and freezing of the evaporator 4 is prevented whereby the cooling operation is continued without interruption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms an absorption cycle by using an aqueous solution such as lithium bromide as an absorption liquid during cooling operation, and supplies cold / hot water cooled by an evaporator to an indoor unit during the operation of the absorption cycle. The present invention relates to an absorption cooling and heating machine in which cooling water is circulated by a cooling water pump between an absorber and a cooling tower fan for exhaust heat.

[0002]

2. Description of the Related Art In an absorption-type air conditioner, during cooling operation, a refrigerant vapor is separated from a low-concentration absorption liquid boiled by heating a gas burner in a regenerator, and the separated refrigerant vapor is cooled by a condenser to form a refrigerant liquid. Is supplied to the evaporator. The absorbing liquid in which the refrigerant vapor is separated into a high concentration by the regenerator is sent to the absorber. The refrigerant liquid takes heat from its own evaporation to form a cooling source, cools cold / hot water circulating in the hot / cold water pipe, and circulates the cold / hot water to the air conditioning heat exchanger of the indoor unit to cool the room. Further, the absorbing liquid absorbs the refrigerant vapor from the evaporator in the absorber, and in order to discharge the heat generated at this time to the outside, the heat from the absorber is given to the cooling water by heat exchange, and the cooling tower fan is used. The cooling water is circulated and discharged to the cooling tower.

Further, during heating operation, a cooling / heating switching valve in the absorbing liquid flow path which connects the regenerator and the evaporator is opened to supply the absorbing liquid heated by the gas burner into the evaporator. As a result, the hot and cold water passing through the hot and cold water pipe in the evaporator is heated and circulated to the indoor terminals such as the indoor unit and the floor heating panel.

[0004]

During the cooling operation, there are times when the cooling / warming water is stopped by turning off the thermosensor on the indoor unit side or the cooling operation stop processing is executed by the cooling operation OFF instruction. In this case, as the load from the indoor terminal side suddenly decreases, the evaporation amount (heat absorbing action) of the refrigerant also decreases. on the other hand,
The absorption liquid maintains its original absorption capacity,
The absorber (ABS) is in a state of excessive absorption capacity. As a result, the evaporator (refrigerant) is in a supercooled state.

When the cooling tower fan is driven in this state and the cooling water is continuously circulated to the absorber by the cooling water pump, the temperature of the evaporator is lowered, and finally the refrigerant in the evaporator is frozen (hereinafter, the refrigerant is cooled). There is a problem that freeze is used in the same meaning as freeze of the evaporator. Even in such a case, the cooling water pump had to be continuously driven to circulate the cooling water in the absorber because of the dilution that promotes the reduction of the concentration of the absorbing liquid. For this reason, when the temperature reaches a temperature at which the evaporator freezes, the cooling operation is stopped as an evaporator low temperature abnormality. As a result, even if there is an ON command (cooling operation instruction) or an operation restart instruction for the thermosensor on the indoor unit side, there is a problem that the cooling operation must be interrupted.

Further, when the cooling operation is performed, if the water at the time of the change of the seasons of spring and autumn or the well water is used as the supply water, the supply temperature of the cooling water becomes low. For this reason, if the cooling water pump in the cooling water circulation path is driven normally at the cold start (low temperature operation start) when a new cooling operation is performed after a long time has elapsed after the cooling operation was stopped, the cooling water temperature is low and the refrigerant Immediately after the start of generation, the evaporator is excessively cooled due to excessive absorption capacity of the absorber (the lower the cooling water temperature, the larger the absorption capacity). Therefore, at the beginning of the cooling operation, the temperature of the evaporator sharply drops, and the cooling operation must be stopped as an evaporator low temperature abnormality, and the same inconvenience as that occurring during the cooling operation stop processing described above is caused. Occurs.

The present invention has been made in view of the above circumstances, and its purpose is to reduce the temperature of the evaporator to a predetermined temperature or lower (freezing temperature) during cooling operation and during cooling operation stop processing during cooling operation. In this case, the cooling tower fan and / or the cooling water pump can be stopped to prevent the evaporator from freezing, and the cooling operation can be continued without interruption after the cooling operation stop process is canceled. It is an object of the present invention to provide an absorption-type air conditioner / heater that can prevent the evaporator from freezing by lowering the cooling water pump to the standby rotation speed when the water temperature is low and can continue the cooling operation without hindrance.

[0008]

(Aspect 1) In an absorption type air conditioner, a regenerator for heating an absorbing liquid containing a refrigerant by a heating means and separating a refrigerant vapor from the absorbing liquid,
A condenser that cools and condenses the refrigerant vapor separated by the regenerator, an evaporator that evaporates the refrigerant liquid generated by the condenser under low pressure, and an absorbing liquid in which the refrigerant vapor is separated by the regenerator. Cooling having an absorber that absorbs the refrigerant vapor evaporated by the evaporator, a cooling water pump that is connected to the absorber by a cooling water circulation path, circulates cooling water in the absorber, and a cooling tower fan that cools the cooling water An absorption cycle having a column, an absorption liquid pump for returning the absorption liquid from the absorber to the regenerator, and a heating absorption liquid flow having a cooling / heating switching valve and connecting the regenerator and the evaporator. And the cooling / heating switching valve is closed, the evaporator is used as a cooling source by the operation of the absorption cycle, and when the cooling / heating switching valve is opened, the absorption liquid heated by the regenerator is used as the heating absorption liquid. An absorption-type heat source device that supplies a heat source by supplying it to the evaporator through a passage, and cold / hot water heated or cooled by the heat exchange pipe of the evaporator is opened / closed from the heat exchange pipe by a cold / hot water pump. A hot and cold water circulation circuit to circulate to the indoor terminal via the, the temperature of the evaporator during the cooling operation is detected by the temperature detection means, if the detected temperature is below a predetermined temperature, the cooling water circulation path Either or both of the cooling tower fan and the cooling water pump are stopped.

(Claim 2) When the evaporator reaches a predetermined temperature or higher, the cooling water pump and / or the cooling tower fan are restarted.

(Regarding Claim 3) A regenerator for heating the absorbing liquid containing the refrigerant by the heating means to separate the refrigerant vapor from the absorbing liquid, and a condenser for cooling and condensing the refrigerant vapor separated by the regenerator. An evaporator for evaporating the refrigerant liquid generated by the condenser under a low pressure, an absorber for absorbing the refrigerant vapor evaporated by the evaporator in the absorbing liquid in which the refrigerant vapor is separated by the regenerator, and the absorber And a cooling tower having a cooling water pump for circulating the cooling water to the absorber and a cooling tower fan for cooling the cooling water, and for returning the absorbing liquid from the absorber to the regenerator. An absorption cycle having an absorption liquid pump, a heating absorption liquid flow path having a cooling / heating switching valve connecting the regenerator and the evaporator, and operation of the absorption cycle when the cooling / heating switching valve is closed. When the evaporator is used as a cooling source and the cooling / heating switching valve is opened, the absorption liquid heated by the regenerator is supplied to the evaporator via the heating absorption liquid flow path to serve as a heating source. A heat source device, and a cold / hot water circulating circuit for circulating cold / hot water heated or cooled by the heat exchange pipe of the evaporator from the heat exchange pipe to an indoor terminal device through an on-off valve by a cold / hot water pump, During cooling operation, the temperature of the cooling water in the cooling water circuit is detected by the temperature detecting means, and when the detected temperature is lower than a predetermined temperature, the cooling water pump is changed from the steady rotation speed to the standby rotation speed with a small rotation speed. It is characterized by lowering the circulation flow rate of cooling water.

(Claim 4) When the temperature of the cooling water detected by the temperature detecting means exceeds a predetermined temperature, the cooling water pump is increased from the standby rotation speed having a small rotation speed to the steady rotation speed to cool the cooling water pump. The feature is that the circulating flow rate of water is returned to a steady state.

[0012]

(Operation and effect of the invention) (Claim 1) During the cooling operation and during the cooling operation, the hot and cold water is stopped by turning off the thermosensor on the indoor unit side, and the cooling operation is stopped by the cooling operation OFF instruction. Sometimes the temperature detecting means detects the temperature of the evaporator. When the detected temperature of the evaporator has dropped to a predetermined temperature or lower, the driving of the cooling tower fan and / or the cooling water pump is stopped.

Thus, when the load on the indoor terminal side is small and the heat absorption operation is hardly performed, the heat dissipation operation on the absorber side is also stopped by stopping both or either of the cooling tower fan and the cooling water pump. Therefore, it is possible to prevent an evaporator low temperature abnormality such that the evaporator is excessively cooled and frozen. Therefore, the cooling operation can be continued without interruption.

(Claim 2) When the evaporator exceeds a predetermined temperature, the operation of the cooling water pump and / or the cooling tower fan is restarted. As a result, the circulation of the absorption liquid is restored, and the absorption liquid can be diluted.

(Claim 3) When the cooling operation is started when the supply water temperature is low, the temperature of the cooling water in the cooling water circulation passage is detected by the temperature detecting means. When the detected cooling water temperature is equal to or lower than the predetermined temperature, the cooling water pump is reduced from the steady rotation speed to the standby rotation speed to reduce the circulation flow rate of the cooling water. As a result, it is possible to suppress excessive absorption capacity in the absorber due to the low cooling water temperature, and maintain the absorber with an appropriate absorption capacity. Therefore, it is possible to prevent the evaporator low temperature abnormality such as the evaporator being excessively cooled and frozen when the supply water temperature is low, and the cooling operation can be continued or started without any trouble.

(Claim 4) When the temperature of the cooling water exceeds a predetermined temperature, the operating state of the cooling water pump returns from the standby speed to the steady speed. Therefore, if the cooling water temperature is restored to normal, the regular cooling operation can be continued without interruption.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment of the present invention. FIG. 1 is an absorption type air conditioner controlled by a control device 2A, which includes an outdoor unit 1A and a plurality of indoor units RU as indoor terminals. This outdoor unit 1A includes a heat source unit body (absorption type heat source unit) 1B, a cooling tower fan S, and a sprinkler Ds.
And a cooling tower CT provided with.

The heat source unit main body 1B of the outdoor unit 1A is mainly made of stainless steel and forms an absorption cycle by using a refrigerant and an aqueous solution of lithium bromide as an absorbing liquid. B is a gas burner as a heating means, and a combustion fan F supplies gas fuel from a gas source Gs to a gas source solenoid valve 1a and a proportional valve 1.
It is sent to the gas burner B via b and ignited by the ignition plug 1d. When a flame is formed in the gas burner B by ignition, the output from the frame rod 1e is sent to the control device 2A.

1 is a high temperature regenerator, 2 is a low temperature regenerator,
Reference numeral 3 is an absorber, 4 is an evaporator, and 5 is a condenser. The absorbing liquid contains an inhibitor that suppresses corrosion of lithium bromide on stainless steel.

In the high temperature regenerator 1, the low-concentration absorption liquid supplied to the inside of the heating tank 11 is heated by the gas burner B, and is formed between the medium-concentration absorption liquid separation cylinder 12 and the absorption liquid partition container 13. When the absorption liquid after heating the solid absorption liquid ascending flow path 14 rises, water as a refrigerant in the low-concentration absorption liquid evaporates and separates as a refrigerant vapor (water vapor). The medium-concentration absorption liquid concentrated by the evaporation of the refrigerant vapor is redirected inward by the absorption liquid return plate 15, and the absorption liquid partition container 13
Returned inside.

The medium-concentration absorption liquid in which the refrigerant has been separated to have a high concentration is supplied to the low temperature regenerator 2 through the medium-concentration absorption liquid flow path L1 provided on the side of the absorption liquid partition container 13. The separated refrigerant vapor is recovered by the refrigerant absorption tank 10 and supplied to the condenser case 50 via the refrigerant flow path L5.
In addition, an inlet of a heating absorbing liquid channel L4 for supplying the absorbing liquid heated during the heating operation into the evaporator 4 is opened at the bottom of the absorbing liquid partition container 13.

Inside the lower portion of the refrigerant absorption tank 10, a refrigerant partition cylinder 17 is joined to the outer surface of the medium-concentration absorbent separation column 12 to form a heat insulating gap 17 a between the refrigerant partition cylinder 17 and the medium-concentration absorbent separation column 12. is doing. Therefore, the heat in the medium-concentration absorbent separation column 12 is cut off, and the refrigerant in the refrigerant absorption tank 10 is not heated by the high-temperature absorbent in the absorbent rising passage 14. The outside of the refrigerant partition cylinder 17 in the refrigerant absorption tank 10 is a refrigerant storage section 10a for storing the separated liquid refrigerant, and the refrigerant stored in the refrigerant storage section 10a is in the condenser case via the refrigerant flow path L5. 50.

In the low-temperature regenerator 2, the medium-concentration absorbing liquid supplied through the medium-concentration absorbing liquid flow path L1 passing through the heat exchanger H on the way flows in from the ceiling of the low-temperature regenerator case 20, and enters the refrigerant absorption tank. It is reheated using the outer wall of 10 as a heat source, and is separated into a refrigerant vapor and a high-concentration absorbing liquid by the gas-liquid separation unit 22. The refrigerant vapor is the refrigerant vapor outlet 21 and the communication gap 5A.
Is supplied into the condenser case 50 from the
It is stored in the high-concentration absorbent receiving part 23 and supplied to the absorber 3 via the high-concentration absorbent flow path L2.

An orifice (not shown) for restricting the flow rate of the medium-concentration absorption liquid flowing from the absorption-liquid partition container 13 to the low-temperature regenerator 2 is provided in the medium-concentration absorption liquid flow path L1. The medium-concentration absorption liquid is supplied into the regenerator 2 due to the pressure difference between the medium-concentration absorption liquid separation cylinder 12. For this reason,
The internal pressure of the low temperature regenerator case 20 is about 70 mmHg, and the internal pressure of the medium concentration absorbent separation column 12 is about 700 mmHg.

The absorber 3 has a copper pipe wound in a vertical cylindrical shape inside an evaporation / absorption case 30 and has an absorption coil 31 wound in a coil as an absorption pipe through which cooling water flows. . The high-concentration absorption liquid supplied from the high-concentration absorption liquid receiving portion 23 of the low-temperature regenerator 2 flows into the upper end of the absorption coil 31 through the high-concentration absorption liquid channel L2 due to the pressure difference, and the high-concentration absorption liquid is supplied. It is sprayed by the spraying tool 32.

The high-concentration absorption liquid thus dispersed adheres to the surface of the absorption coil 31 in a thin film and flows down by the action of gravity, and absorbs water vapor to become a low-concentration absorption liquid. When absorbing the water vapor, heat is generated on the surface of the absorption coil 31, but is cooled by the cooling water circulating in the absorption coil 31.

The low-concentration absorption liquid in the absorber 3 is heated by the operation of the absorption liquid pump P1 from the bottom portion 33 through the heat exchanger H and the low-concentration absorption liquid passage L3 provided with the absorption liquid pump P1 to the heating tank 11 Return to inside. Further, in the absorption coil 31, the cooling water cooled through the water sprinkler Ds of the cooling tower CT during the cooling operation circulates in the cooling coil 51 of the condenser 5.

The bottom portion 3 of the evaporation / absorption case 30 of the absorber 3
3 is connected to an ejector 65 as a gas extraction unit. The ejector 65 is provided to extract the non-condensable gas (hydrogen gas) generated in the absorption cycle. This guides the refrigerant vapor and the non-condensable gas in the absorber 3 from the suction conduit 67 to the gas-liquid separation pipe 66 by the ejector effect, separates the non-condensable gas from the absorption liquid, and the non-condensable gas storage section 68. Store in.

The evaporator 4 is provided on the outer circumference of the absorption coil 31 in the evaporation / absorption case 30 and is provided on the outer circumference of a partition plate 40 having a vertical cylindrical shape and a large number of communication ports (not shown). A vertical cylindrical evaporation coil 41 made of a copper tube through which cold and hot water flows is disposed, and a refrigerant liquid spraying tool 42 is attached above it. The bottom 43 of the evaporator 4 communicates with the bottom of the absorbent partition 13 in the medium-concentration absorbent separating column 12 through a heating absorbent flow path L4 having an electromagnetic cooling / heating switching valve 6.

During the cooling operation, when the refrigerant liquid (water) is made to flow down on the evaporation coil 41 by the refrigerant liquid spraying tool 42, the flowing-down refrigerant liquid wets the surface of the evaporation coil 41 due to the surface tension and becomes a film, so that the gravity Evaporation / absorption case 3 that has a low pressure (for example, 6.5 mmHg) while descending under action
In 0, vaporization heat is taken from the evaporation coil 41 to evaporate, and the cold / hot water for cooling flowing in the evaporation coil 41 is cooled.

In the condenser case 50 accommodating the condenser 5, a dish-shaped refrigerant liquid for receiving the refrigerant liquid in which the refrigerant vapor is liquefied by cooling in the cooling coil 51 at a position apart from the bottom of the condenser case 50. A receiving portion 52 is provided. The refrigerant liquid receiving portion 52 is located above the refrigerant liquid sprinkler 42 of the evaporator 4, and connects the refrigerant liquid supply path L6 to the refrigerant cooler 48 that cools the refrigerant liquid by self-cooling of the supplied refrigerant liquid. Is provided. The refrigerant cooler 48 is provided with a first thermistor (temperature detecting means) Tf that detects the temperature of the evaporator 4 not only during the cooling operation but also during an operation stop process during the cooling operation, which will be described later.

The condenser 5 communicates with the refrigerant reservoir 10a of the refrigerant absorption tank 10 through a refrigerant flow path L5 provided with an orifice (not shown) for limiting the refrigerant flow rate, and also with the refrigerant vapor outlet 21 and the communication. It also communicates with the low temperature regenerator 2 through the gap 5A. The refrigerant is supplied to the condenser 5 due to a pressure difference (about 70 mmHg in the condenser case 50). The refrigerant vapor supplied into 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 portion 52 to the refrigerant cooler 48 via the refrigerant liquid supply passage L6.

The refrigerant liquid overflowing from the refrigerant liquid receiving portion 52 is
The concentration of the absorption liquid stored in the refrigerant liquid storage portion 54 formed by the inner bottom portion of the condenser case 50 and circulated in the absorption cycle during the cooling operation is maintained substantially high in order to ensure the cooling performance. The refrigerant liquid reservoir 54 and the refrigerant cooler 48 communicate with each other through a refrigerant liquid flow path L7 having the refrigerant valve 7, and when there is a risk of freezing of the refrigerant liquid, the refrigerant valve 7 is opened to control the refrigerant. The liquid is supplied to the evaporator 4, and freezing is prevented by increasing the vapor pressure in the evaporator 4. The refrigerant valve 7 is also opened at the start of the heating operation, all the refrigerant liquid stored in the refrigerant liquid storage portion 54 at the time of the cooling operation is supplied to the evaporator 4, and the concentration of the absorbing liquid circulated by heating during the heating operation. Is kept low to suppress the occurrence of crystallization.

During the cooling operation, the absorption liquid is the high temperature regenerator 1 → the medium concentration absorption liquid flow path L1 → the high concentration absorption liquid flow path L2 → the high concentration absorption liquid sprayer 32 → the absorber 3 → the absorption liquid pump P1 →
The low-concentration absorbent flow path L3 is circulated in the order of the high temperature regenerator 1.
Further, the refrigerant is the high temperature regenerator 1 (refrigerant vapor) → refrigerant passage L5.
(Refrigerant vapor) or low temperature regenerator 2 (refrigerant vapor) → condenser 5 (refrigerant liquid) → refrigerant liquid supply path L6 (refrigerant liquid) or refrigerant liquid flow path L7 (refrigerant liquid) → refrigerant cooler 48 → refrigerant liquid spraying Tool 42 (refrigerant liquid) → evaporator 4 (refrigerant vapor) → absorber 3 (absorption liquid) → absorption liquid pump P1 → low-concentration absorption liquid flow path L3 → high temperature regenerator 1 in this order.

The absorption coil 31 of the absorber 3 which exchanges heat with the absorbing liquid and the cooling coil 51 of the condenser 5 are connected to form a continuous coil. This continuous coil has a cooling water flow path 3
4 is connected to the cooling tower CT to form a cooling water circulation path. In this cooling water circulation path, the absorption coil 31
In the cooling water flow path 34 existing between the inlet of the cooling water and the cooling tower CT, a cooling water pump P2 for sending the cooling water into the continuous coil.
Is provided. By the operation of this cooling water pump P2, the cooling water passing through the continuous coil takes heat absorbed by the absorption coil 31 and obtains the heat of condensation by the cooling coil 51 to become a relatively high temperature, and the cooling tower having the cooling tower fan S. Supplied to CT.

During the cooling operation, the cooling water pump P
By the operation of 2, the cooling water in the cooling tower CT is cooled by the cooling tower fan S.
While being promoted to evaporate by the air blow, the water is circulated in the order of sprinkler Ds → cooling tower CT → cooling water pump P2 → absorption coil 31 → cooling coil 51 → sprinker Ds → cooling tower CT. In this cooling tower CT, the falling cooling water is partially evaporated into the atmosphere. Therefore, the cooling water releases heat into the atmosphere to form a low temperature exhaust heat cycle. Also, the outdoor unit 1A
Is provided with a cistern 69 for storing water, and an electrode 70,
The water level of the water supplied from the water supply passage 73 via the water supply valve 72 is detected by 71. The amount of water supplied is determined based on the detected water level, and the water supply to the cistern 69 is interrupted (on / off).

The outlet of the evaporation coil 41 of the evaporator 4 is connected to the cold / hot water outgoing path 60, and the inlet of the evaporation coil 41 is connected to the cold / hot water return path 61 via the cold / hot water pump P3 and the cistern 69. ing. Cold / hot water outgoing route 60
Is connected to each indoor unit RU as shown in FIG.
In each indoor unit RU, only the open / close valve Vt for cold / hot water of the indoor unit RU whose operation is instructed by the operation signal of the remote controller (not shown) for the indoor unit RU is driven to open. The open / close valve Vt may be provided in the cold / hot water flow path 47 on the side where cold / hot water flows into the indoor unit RU.
May be built in the indoor unit RU as a motor valve. Further, the opening / closing valve Vt provided in the cold / hot water flow path 47 and the indoor unit RU
The on-off valve Vt built in may be mixed.

The cold / warm water having a low temperature in the evaporation coil 41 is the outlet of the evaporation coil 41 → the cold / hot water outgoing path 60 → the cold / hot water flow of the upstream side in the indoor unit RU whose open / close valve is driven to open. The path 47 is circulated in the order of the indoor unit RU, the cold / hot water flow path 47 on the downstream side, the cold / hot water return path 61, the cistern 69, the cold / hot water pump P3, and the inlet of the evaporation coil 41.

The heating absorbing liquid 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 and the absorbing liquid pump P1 is operated. As a result, the high-temperature medium-concentration absorbing liquid in the absorbing-liquid partition container 13 in the medium-concentrating absorbing liquid separating cylinder 12 flows into the evaporator 4, and the evaporation coil 41 is heated by the high-temperature vapor (refrigerant vapor) of the medium-concentrated absorbing liquid. The cold and warm water inside is heated. The heated hot / cold water in the evaporation 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 absorption liquid in the evaporator 4 enters the absorber 3 side from the communication port of the partition plate 40, passes through the low-concentration absorption liquid flow path L3, and returns to the heating tank 11 by the absorption liquid pump P1.

In the absorption type air conditioner of this embodiment, the absorption liquid pump P for circulating the absorption liquid in the absorption cycle is used.
1 and the cold / hot water pump P3 for circulating the cold / hot water cooled or heated by the evaporation coil 41 to the indoor unit RU through the cold / hot water passage 47 are individually driven by separate motors.

Next, the control operation of the control device 2A for controlling the absorption type air conditioner will be described. The control device 2A is
The combustion control of the gas burner B, the drive control of the absorption liquid pump P1, the cooling water pump P2, and the hot / cold water pump P3, the control of the cooling water pump P2, the rotation control of the cooling tower fan S of the cooling tower CT, the absorption cycle are provided. The cooling / heating switching valve 6 and the refrigerant valve 7 are controlled to control the cooling operation and the heating operation of the absorption cooling / heating machine, and receive the output from the first thermistor Tf to cool the cooling tower fan S and the cooling as described later. Control the water pump P2.

[Heating operation] In the heating operation, the cooling / heating switching valve 6 is opened in response to the user's instruction to start the heating operation of the remote controller existing in the room where the indoor unit RU is installed, and the absorption liquid pump P1 and the cooling temperature are controlled. The operation of the motor that drives the water pump P3 is started, and the combustion of the gas burner B is performed. In this absorption type air conditioner / heater, as shown in FIG. 2, the outdoor unit 1A is configured to be able to supply cold / hot water also to the floor heating panel 30A via the opening / closing valve Vp. Therefore, in the control device 2A, whether or not the floor heating panel 30A is installed is determined by the presence or absence of an operation signal from a floor heating panel remote controller (not shown) separately provided in the floor heating panel 30A. And control. In addition, the on-off valve Vp is the floor heating panel 30A
It is provided as a thermal valve in the cold / hot water flow path 47 on the side that flows in.

[Cooling operation] In the cooling operation, the cooling / heating switching valve 6 is closed in response to the user's instruction to start the cooling operation of the remote controller existing in the room where the indoor unit RU is installed, and the absorption liquid is activated by the operation of the motor. The operation of the pump P1 and the cold / hot water pump P3 is started, and the combustion of the gas burner B is performed.

FIG. 3 shows a flow chart for controlling the cooling tower fan S and the cooling water pump P2. When there is an instruction to continue the operation of the cooling tower fan S and the cooling water pump P2 in step S1 of this flowchart, the first operation is performed in step S2.
The temperature of the evaporator 4 is detected based on the output from the thermistor Tf. If there is no instruction to continue the operation of the cooling tower fan S and the cooling water pump P2 in step S1, the process returns to step S1. Based on the output from the first thermistor Tf, it is determined in step S3 whether the temperature of the evaporator 4 is 3 ° C. or lower.

If the temperature of the evaporator 4 is 3 ° C. or lower, both the cooling tower fan S and the cooling water pump P2 are stopped in step S4 to prevent the evaporator 4 from being overcooled. When it is determined that the temperature of the evaporator 4 exceeds 3 ° C., the operation of the cooling tower fan S and the cooling water pump P2 is maintained in step S5. Thereafter, when the circulation of cold / hot water is restarted by turning on the thermosensor on the indoor unit RU side, or when the operation stop processing by the cooling operation OFF instruction is canceled, the evaporator 4 removes the load from the indoor unit RU side. Upon receipt, the temperature rises gradually.

When the temperature of the evaporator 4 recovers above 7 ° C. in this process, this is detected from the output of the first thermistor Tf, and the detected temperature of the evaporator 4 is discriminated in step S6, and in step S7. The operations of the cooling tower fan S and the cooling water pump P2 are restarted. If the temperature of the evaporator 4 is not 7 ° C. or higher in step S6, the process returns to step S4.

When these stop instructions are issued during the operation of the cooling tower fan S and the cooling water pump P2 (step S8), the operations of the cooling tower fan S and the cooling water pump P2 are stopped (step S8). S9). Unless there is an instruction to stop the cooling tower fan S and the cooling water pump P2 in step S8, the above process is repeated.

As described above, during the cooling operation and during the cooling operation, the first thermistor is operated when the cooling / warming water is stopped by turning off the thermosensor on the indoor unit RU side or when the cooling operation is stopped by the cooling operation OFF instruction. The temperature of the evaporator 4 is detected by Tf.

When the detected temperature of the evaporator 4 is lowered to 3 ° C. or lower, the cooling tower fan S and the cooling water pump P2
Stop driving both. Accordingly, when the load on the indoor unit RU side is small and there is almost no heat absorption, the heat radiation operation on the absorber 3 side is also stopped to prevent the evaporator low temperature abnormality such as the evaporator 4 being excessively cooled and frozen. can do. Therefore, the cooling operation can be continued without interruption.

The detection operation mode in which the temperature of the evaporator 4 is detected by the first thermistor Tf is used to stop the cold / hot water by turning off the thermosensor, the cooling operation stop processing by the cooling operation off instruction, and various error stop. Processing and stop processing for stopping the cooling operation when the outside air temperature decreases are included. Further, in the above, the temperature of the evaporator 4 (3 ° C. or less, 7
Cooling tower fan S and cooling water pump P
Although both of the operations of No. 2 are stopped and restarted, either one of the cooling tower fan S and the cooling water pump P2 may be stopped and restarted.

4 and 5 show a second embodiment of the present invention. The second embodiment is different from the first embodiment in that instead of the first thermistor Tf, a second thermistor Ts for detecting the temperature of the cooling water is provided with an inlet of the absorption coil 31 and cooling as shown in FIG. It is provided in the cooling water flow path 34 between the tower CT.

The second embodiment shows the control at the cold start (low temperature operation start) in which the cooling operation is newly started after a long time has elapsed after the cooling operation is stopped. The control at the cold start is performed to prevent the evaporator 4 from being excessively cooled immediately after the start of refrigerant generation.

FIG. 5 shows a flowchart for controlling the cooling water pump P2 at the cold start. As long as the operation instruction of the cooling water pump P2 is received in step S10 of this flowchart, it is determined in step S11 whether or not it is a cold start when performing the cooling operation. When it is not a cold start, the cooling water pump P2 is operated by the controller 2A at a steady rotation speed of 3690 rpm in step S12.

When the cold start is determined in step S11, the process proceeds to step S13, and the temperature of the cooling water in the cooling water circulation path is detected by the second thermistor Ts. In step S14, it is determined based on the output from the second thermistor Ts whether or not the cooling water temperature in the cooling water circulation path is the critical temperature of 23 ° C. or lower.

When the cooling water temperature exceeds 23 ° C.,
After shifting to step S12, the cooling water pump P2 is set to the steady state of 3
Operate at a rotation speed of 690 rpm. Cooling water temperature is 23 ℃
When the following critical temperature is determined, the cooling water pump P2
Is operated at a low rotation speed of 2100 rpm (step S15).

During the process of operating the cooling water pump P2 at the standby rotation speed, the temperature of the cooling water rises, and at step S16, 23 ° C.
If it is determined that the cooling water pump P2 is exceeded, the cooling water pump P2 is set to 2100.
The standby rotation speed of rpm is returned to the steady rotation speed of 3690 rpm for operation (step S17).

If an instruction to stop the cooling water pump P2 is issued during operation of the cooling water pump P2 (step S
18), stop the operation of the cooling water pump P2 (step S19). Unless there is an instruction to stop the cooling water pump P2 in step S18, the above process is repeated.

As described above, when cold-starting when the supply water temperature is low, the temperature of the cooling water in the cooling water circulation passage is set to the second value.
It is detected by the thermistor Ts. This cooling water temperature is 2
If the temperature is 3 ° C or lower, set the cooling water pump P2 to 3690 rpm.
To reduce the circulating flow rate of the cooling water by reducing the steady rotation speed of 2 to the standby rotation speed of 2100 rpm.

As a result, it is possible to suppress the excessive absorption capacity of the absorber 3 due to the low temperature of the cooling water, and to maintain the absorption capacity of the absorber 3 at an appropriate level. Therefore, it is possible to prevent an evaporator low temperature abnormality such as the evaporator 4 being excessively cooled and frozen when the supply water temperature is low, and the cold start can be performed without any trouble during the cooling operation. The second embodiment can be applied not only at the cold start but also when the cooling water circulating in the cooling water circulation path is cooled to a predetermined temperature or lower during the cooling operation.

The critical temperature of the cooling water is 23 ° C. or 36
The steady rotation speed of 90 rpm and the standby rotation speed of 2100 rpm are enumerated as examples, and the critical temperature, the steady rotation speed and the standby rotation speed can be variously set according to the installation environment and the usage situation.

In the above embodiment, separate motors are used to individually operate the absorbent pump P1 and the cold / hot water pump P3, but both the absorbent pump P1 and the cold / hot water pump P3 are driven by a single motor. You may use the tandem pump which operates at the same rotation speed. In addition, the first as the temperature detection means
Although the thermistor Tf and the second thermistor Ts are used, a resistance temperature detector having a function similar to these may be used.

Further, although the absorption type air conditioner has been described using the double effect type, it may be a single effect type or a multiple effect type. Further, as the heating source, a kerosene burner, a petroleum burner, an electric heater or the like may be used instead of the gas burner B.

Further, in the concrete implementation of the present invention, the number of indoor units is not limited to three, and a desired number can be set.
The cistern 69 for water storage and the floor heating panel 30A may be variously modified without departing from the scope of the present invention, such as being provided as necessary.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an absorption cooling / heating machine according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of an indoor unit, an outdoor unit, and a floor heating panel.

FIG. 3 is a flowchart for controlling a cooling tower fan and a cooling water pump.

FIG. 4 is a schematic configuration diagram of an absorption type air conditioner / heater according to a second embodiment of the present invention.

FIG. 5 is a flowchart for controlling a cooling water pump at cold start.

[Explanation of symbols]

1 High temperature regenerator 2 low temperature regenerator 3 absorber 4 evaporator 5 condenser 6 cooling / heating switching valve 34 Cooling water flow path (cooling water circulation path) 41 Evaporation coil (heat exchange pipe) 47 Cold / hot water flow path (cold / hot water circulation circuit) 54 Refrigerant liquid reservoir 1A outdoor unit 1B heat source unit (absorption type heat source unit) 2A control device RU indoor unit (indoor terminal) B gas burner (heating means) CT cooling tower S cooling tower fan L4 Absorbing liquid flow path for heating P1 absorption pump P2 cooling water pump P3 cold / hot water pump Tf first thermistor (temperature detecting means) Ts second thermistor (temperature detecting means) Vp, Vt open / close valve

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsuya Oshima             Rinnai 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi             Within the corporation (72) Inventor Kaoru Kawamoto             4-1-2 Hirano-cho, Chuo-ku, Osaka City, Osaka             Gas Co., Ltd. F term (reference) 3L093 AA05 BB11 CC03 HH14 JJ06                       JJ08 KK01 KK03

Claims (4)

[Claims] 1. A regenerator for heating an absorbing liquid containing a refrigerant by a heating means to separate the refrigerant vapor from the absorbing liquid, a condenser for cooling and condensing the refrigerant vapor separated by the regenerator, and this condenser. An evaporator for evaporating the refrigerant liquid generated by the refrigerant under low pressure; an absorber for absorbing the refrigerant vapor evaporated by the evaporator in the absorbing liquid in which the refrigerant vapor is separated by the regenerator; and the absorber and the cooling water circulation path. And a cooling tower having a cooling water pump for circulating cooling water in the absorber and a cooling tower fan for cooling the cooling water, and an absorption liquid pump for returning the absorption liquid from the absorber to the regenerator. An absorption cycle having: a heating absorption liquid flow path having a cooling / heating switching valve that connects the regenerator and the evaporator; and, when the cooling / heating switching valve is closed, the evaporation cycle is performed by the operation of the absorption cycle. As a cooling source, and when the cooling / heating switching valve is opened, an absorption heat source device that supplies the absorption liquid heated by the regenerator to the evaporator via the heating absorption liquid flow path to serve as a heating source. A hot / cold water circulation circuit that circulates cold / hot water heated or cooled by the heat exchange pipe of the evaporator from the heat exchange pipe to an indoor terminal device via an on-off valve by a cold / hot water pump, and during the cooling operation, The temperature of the evaporator is detected by the temperature detecting means, and when the detected temperature is equal to or lower than a predetermined temperature, it is possible to stop both or one of the cooling tower fan and the cooling water pump of the cooling water circulation path. Characteristic absorption type air conditioner. 2. The absorption type according to claim 1, wherein when the evaporator reaches a predetermined temperature or higher, the operation of the cooling water pump and / or the cooling tower fan is restarted. Air conditioner. 3. A regenerator that heats an absorbing liquid containing a refrigerant by a heating means to separate the refrigerant vapor from the absorbing liquid, a condenser that cools and condenses the refrigerant vapor separated by the regenerator, and this condenser. An evaporator for evaporating the refrigerant liquid generated by the refrigerant under low pressure; an absorber for absorbing the refrigerant vapor evaporated by the evaporator in the absorbing liquid in which the refrigerant vapor is separated by the regenerator; and the absorber and the cooling water circulation path. And a cooling tower having a cooling water pump for circulating cooling water in the absorber and a cooling tower fan for cooling the cooling water, and an absorption liquid pump for returning the absorption liquid from the absorber to the regenerator. An absorption cycle having: a heating absorption liquid flow path having a cooling / heating switching valve connecting the regenerator and the evaporator; and, when the cooling / heating switching valve is closed, the evaporation cycle is performed by the operation of the absorption cycle. A cooling source, and when the cooling / heating switching valve is opened, an absorption heat source device that supplies the absorption liquid heated by the regenerator to the evaporator via the heating absorption liquid flow path to serve as a heating source. A hot / cold water circulating circuit that circulates cold / hot water heated or cooled by the heat exchange pipe of the evaporator from the heat exchange pipe to an indoor terminal device via an on-off valve by a cold / hot water pump, and during the cooling operation, The temperature of the cooling water in the cooling water circuit is detected by the temperature detecting means, and when the detected temperature is lower than or equal to the predetermined temperature, the cooling water pump is cooled from the steady rotation speed to the standby rotation speed with a small rotation speed, and cooling is performed. An absorption cooling and heating machine characterized by reducing the circulating flow rate of water. 4. When the temperature of the cooling water detected by the temperature detecting means exceeds a predetermined temperature, the cooling water pump is increased from the standby rotation speed having a small rotation speed to the steady rotation speed, and the circulation flow rate of the cooling water is increased. The absorption type air conditioner / heater according to claim 3, wherein the air conditioner is returned to a normal state.