KR100261259B1 - Absorbent air conditioner - Google Patents

Abstract

PURPOSE: An absorption air conditioning system is provided to reduce dilution time by radiating into the indoor area, through the cool/hot water circuit, heat from the absorption solution circulating through the absorption refrigeration cycle. CONSTITUTION: A system comprises an absorption refrigeration cycle(2) utilizing a combustion unit(3) for heating an absorption solution; an indoor air conditioning unit for air conditioning the indoor area by using the hot/cold water heated or cooled by the absorption refrigeration cycle; a water coolant cooling unit(5) for cooling the water coolant which is used for cooling and liquefying the evaporative refrigerant in the absorption refrigeration cycle; and a main control unit(6) for controlling each mounted electric component. The absorption refrigeration cycle, water coolant cooling unit and main control unit are installed in the outdoor area, and the indoor air conditioning unit is installed in the indoor area.

Description

Absorption HVAC

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner capable of cooling operation and heating operation using an absorption refrigeration cycle, and more particularly, to a technique of dilution operation when stopping heating operation.

Techniques for cooling and heating operations using absorption refrigeration cycles are known.

The cooling operation heats the absorbent liquid by heating means, vaporizes a part of the heated absorbent liquid in a regenerator, cools the vaporized vaporized refrigerant in a condenser to liquefy, evaporates the liquefied liquefied refrigerant under low pressure in an evaporator, and liquefies the liquid. The heat medium is cooled by the cold heat generated when the refrigerant evaporates, the cooled heat medium is led to an indoor heat exchanger, and the room is cooled by heat-exchanging the air blown into the room with the cooled heat medium.

On the other hand, the heating operation heats the absorbent liquid by the heating means, induces the heated absorbent liquid to the evaporator to heat the heat medium, guides the heated heat medium to the indoor heat exchanger, and heat exchanges the air blown into the room with the heated heat medium. It is heating the room.

When the operation of the absorption refrigeration cycle is stopped, even if the heating of the absorption liquid by the heating means in the regenerator is stopped, the absorption liquid continues to be heated by the excess heat of the heating means, so that a difference in concentration occurs in the absorption liquid in the absorption refrigeration cycle. When it is cooled as it is, a high concentration of absorbent liquid causes crystallization. If crystallization occurs in the absorption refrigeration cycle, a problem arises in that the circulation of the absorbent liquid is interrupted by the absorbent liquid crystallized at restart, and the restart is impossible.

Here, conventionally, in order to prevent crystallization of the absorbent liquid, when the operation of the absorbent liquid refrigeration cycle is stopped, the temperature of the absorbent liquid (absorbed liquid in the regenerator) heated by the heating means after stopping the heating of the absorbed liquid by the heating means is a predetermined temperature. The dilution operation is performed to operate the solution pump for circulating the absorbing liquid until it lowers.

The dilution operation described above includes a dilution operation when stopping the cooling operation and a dilution operation when stopping the heating operation.

When the cooling operation is stopped, the absorption type refrigeration cycle has a high temperature portion (in the regenerator) and a low temperature portion (in the absorber), so that the temperature of the absorbing liquid can be averaged in a relatively short time by simply operating the solution pump. As a result, the dilution time is short.

By the way, when the heating operation is stopped, there is only a high temperature part in the absorption refrigeration cycle, and there is no low temperature part. Therefore, the temperature of the absorbent liquid cannot be dropped by simply operating the solution pump. Since it is covered with a heat insulating material, most of the heat of the absorbent liquid does not radiate to the surroundings, resulting in a long dilution time.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an absorption type air conditioner that can shorten the dilution time when stopping the heating operation.

1 is a schematic configuration diagram of an absorption type air conditioner

2 is a flowchart showing the control of the dilution operation means after heating.

Explanation of symbols for main parts of the drawings

1-Absorption air conditioning unit 2-Absorption refrigeration cycle

3-combustion apparatus (heating means) 4-indoor air conditioning means

6-Main Control Unit 6a-Indoor Control Unit

6c-Dilution means after heating 15-High temperature regenerator

16-Low Temperature Regenerator 17-Condenser

18-Evaporator 19-Absorber

48-Solution Pump 54-Room Heat Exchanger

55-Indoor fan (Indoor ventilation means) 56-Cold / hot water circuit (thermal medium circuit)

57-Hot and cold water pump (Heat medium pump) 70-Temperature sensor

A-outdoor unit B-indoor unit

T-Communication line V-Valve

In order to achieve the above object, the absorption type air conditioner of the present invention employs the following technical means.

(Means of Claim 1)

Absorption type air conditioner,

a) heating means for heating the absorbent liquid,

b) During the cooling operation, a regenerator for vaporizing a part of the absorbed liquid heated by the heating means, a condenser for cooling and liquefying the vaporized refrigerant generated in the regenerator, and a liquefied refrigerant liquefied in the condenser is evaporated under low pressure to heat refrigerant. An evaporator for cooling the gas, an absorber for absorbing the vaporized refrigerant evaporated in the evaporator into the absorbent liquid, and a solution pump for pumping the absorbent liquid in the absorber into the regenerator;

In a heating operation, an absorption refrigeration cycle for directing the absorbent liquid heated by the heating means to the evaporator to heat the heat medium flowing in the evaporator, and for conveying the absorbent liquid led to the absorber to the regenerator by the solution pump; ,

c) an indoor blowing means installed indoors for generating an air flow blown into the room, an indoor heat exchanger for exchanging heat blown with the air blown into the room, and inducing the heat medium cooled or heated in the evaporator to the indoor heat exchanger; A heat medium circuit for directing the heat medium heat-exchanged with indoor air in the indoor heat exchanger to the evaporator, the air conditioner installed in the heat medium circuit and having a heat medium pump for circulating the heat medium;

d) stopping the heating of the absorbent liquid by the heating means when stopping the heating operation, and circulating the absorbent liquid in the absorption refrigeration cycle by the solution pump until the temperature of the absorbent liquid in the regenerator decreases to a predetermined temperature; In addition, after the heating dilution operation means for performing the dilution operation after heating to circulate the heat medium in the heat medium circuit by the heat medium pump, characterized in that it is characterized in that it is provided.

(Means of Claim 2)

In the absorption type air conditioning apparatus of claim 1,

The solution pump and the heat medium pump is a tandem pump driven by a common motor,

The flow rate control of the heat medium in the heat medium circuit during the operation of the solution pump is characterized by a valve provided in the heat medium circuit.

(Means of Claim 3)

In the absorption type air conditioner of Claim 2,

The main control unit for controlling the absorption refrigeration cycle is installed outdoors with the absorption refrigeration cycle as an outdoor unit,

The valve, the indoor heat exchanger and the indoor blowing means are installed indoors as an indoor unit, and a plurality of indoor units can be connected in parallel to the heat medium circuit, and the indoor units independently control the valve and the indoor blowing means. Equipped with an indoor control unit,

The main control unit and the indoor control unit perform two-way communication through a communication means, and when the indoor control unit receives the instruction of the post-dilution after heating operation formed in the main control unit to stop heating operation, the operation of the indoor blowing means is stopped. The valve is opened in a stopped state to circulate a heat medium to the indoor heat exchanger.

(Action of invention)

During the heating operation, the heating means operates to heat the absorbent liquid in the regenerator, which is led to an evaporator to heat the heat medium. The heated heating medium is guided to the indoor heat exchanger by the heating medium circuit, and heat-exchanges with the air blown into the room by the indoor blowing means to heat the room. The heat medium of the heat exchanger is again led to the evaporator and heated by the absorbent liquid. On the other hand, the absorption liquid which heated the heat medium is sent to a regenerator again by the operation of a solution pump, and is heated.

When the heating operation is stopped, the absorbing liquid in the absorption type refrigeration cycle is purified by the solution pump until the temperature of the absorbing liquid in the regenerator decreases to a predetermined temperature while the dilution operation means after heating stops heating the absorbing liquid by the heating means. . At this time, the dilution operation means after heating circulates the heat medium of the heat medium circuit by the heat medium pump in a state where the operation of the indoor blowing means is stopped until the temperature of the absorbent liquid in the regenerator is lowered to a predetermined temperature. In this way, the heat medium radiated from the indoor heat exchanger is guided to the evaporator to take heat of the absorbent liquid from the evaporator and repeat the heat radiation from the indoor heat exchanger again. On the other hand, the absorbent liquid flowing in the evaporator is deprived of heat by the heat medium circulating in the heat medium circuit, resulting in a drop in temperature.

That is, since the absorbing liquid circulating the absorption type refrigeration cycle by the operation of the solution pump is radiated in the indoor heat exchanger through the heat medium circuit, the temperature drops in a short time as compared with the prior art.

When the temperature of the absorbent liquid in the regenerator decreases to a predetermined temperature, the circulation of the absorbent liquid and the circulation of the heat medium are stopped, and the dilution operation after heating is stopped.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on an Example and a modification.

(Configuration of Example)

This embodiment will be described with reference to FIGS. 1 and 2. 1 is a schematic configuration diagram of an absorption type air conditioning apparatus for air conditioning a room, and FIG. 2 is a flowchart showing a part of control included in a main control unit.

The schematic structure of the absorption type air conditioner 1 is demonstrated. In this embodiment, a dual-utility type was used as an example of the absorption refrigeration cycle (2).

The absorption type air conditioner 1 to which the present embodiment is applied is a dual-effect absorption refrigeration cycle using a combustion device 3 (corresponding to the heating means of the present invention) that heats the absorbing liquid (in this embodiment, lithium bromide aqueous solution). (2), an indoor air conditioning means (4) for air conditioning the room with cold / hot water (corresponding to the heat medium of the present invention, water in the present embodiment) cooled or heated in the absorption refrigeration cycle (2), and the absorption refrigeration cycle (2). And cooling water cooling means 5 for cooling the cooling water used for cooling and liquefying the vaporized refrigerant (steam vapor in the present embodiment), and a main controller 6 for controlling each mounted electric functional component.

In addition, the absorption refrigeration cycle (2), the cooling water cooling means (5) and the main control unit (6) using the combustion device (3) are installed outdoors as the outdoor unit (A), and the indoor air conditioning means (4) The indoor unit B which arrange | positioned the component is arrange | positioned. In addition, the absorption type air conditioner 1 shown in the present embodiment is a so-called multi-air conditioner in which a plurality of indoor units B can be connected to one outdoor unit A. FIG.

(Explanation of absorption refrigeration cycle (2))

The combustion device 3 of the present embodiment uses a gas combustion device that burns gas as fuel to generate heat, and heats the absorbent liquid with the generated heat. The burner 3 burns gas, and the gas burner ( 11, a gas supply means 12 for supplying gas to the gas, and a combustion fan 13 for supplying combustion air to the gas burner 11, and the like.

The boiler 14 of the absorption type refrigeration cycle 2 is heated with heat obtained by gas combustion of the gas burner 11 to heat the low concentration absorbent liquid supplied into the boiler 14.

In addition, the absorption refrigeration cycle (2) is provided with the above-mentioned boiler 14, the low concentration absorbent liquid supplied into the boiler 14 is heated to vaporize (evaporate) the refrigerant (water) contained in the low concentration absorbent liquid A high temperature regenerator 15 for producing a medium absorbent liquid; The medium concentration absorbent liquid is vaporized by vaporizing the refrigerant contained in the medium concentration absorbent liquid by heating the medium concentration absorbent liquid supplied from the high temperature regenerator 15 side using the pressure difference using the heat of condensation of the vaporized refrigerant in the high temperature regenerator 15. A low temperature regenerator 16 made of a high concentration absorbent liquid; A condenser 17 for cooling and liquefying vaporized refrigerant (steam) from the high temperature regenerator 15 and the low temperature regenerator 16; An evaporator 18 for evaporating the liquefied refrigerant (water) liquefied in the condenser 17 under a pressure close to a vacuum; And an absorber 19 for absorbing the vaporized refrigerant evaporated in the evaporator 18 into the high concentration absorbent liquid obtained in the low temperature regenerator 16.

(Description of High Temperature Regenerator 15)

The high temperature regenerator 15 has a boiling unit 14 arranged in the combustion device 3 and a boiling tube 21 extending upward from the boiling unit 14. The vaporized refrigerant, which is boiled in the boiling vessel 14 and vaporized in the low concentration absorbent liquid, is sent into the high temperature regeneration vessel 22 of the cylindrical vessel shape through the boiling vessel 21. The high temperature vaporized refrigerant sent into the high temperature regeneration container 22 is cooled by depriving heat as the heat of vaporization when the medium absorbent liquid in the low temperature regenerator 16 evaporates through the wall of the high temperature regeneration container 22, thereby cooling the liquefied refrigerant (water )

In the high temperature regeneration vessel 22, in order to insulate the medium-density absorbent liquid in the boiling vessel 21 and the liquefied refrigerant (water) remaining in the surroundings after the refrigerant in the low-concentration absorbent liquid is heated in the boiler 14, An adiabatic partition cylinder 24 is formed around the boiling cylinder 21. The heat insulating partition tube 24 has an upper end thereof joined to the upper end of the boiling tube 21, and a lower end of the heat insulating partition tube 24 allows the air for thermal insulation to penetrate between the boiling tube 21 and the heat insulating partition tube 24. It is formed with a gap.

In addition, the liquefied refrigerant (water) liquefied in the high temperature regeneration container 22 and separated to the outside of the heat insulation partition tube 24 is led to the condenser 17 through the liquefied refrigerant pipe 25 connected to the lower portion.

(Description of Low Temperature Regenerator 16)

The low temperature regeneration container 16 is provided with the low temperature regeneration container 31 of the cylindrical container shape which encloses the high temperature regeneration container 22. As shown in FIG.

Meanwhile, the medium absorbent liquid in the boiling vessel 21 is supplied to the low temperature regenerator 16 through the medium absorbent liquid tube 26 connected to the lower portion of the boiling vessel 21. In addition, the medium absorbent liquid pipe 26 is provided with decompression means 27 such as an orifice. When the cooling / heating switching valve 53, which will be described later, is closed, the depressurizing means 27 flows the medium absorbent liquid while maintaining the pressure difference between the high temperature regenerator 15 and the low temperature regenerator 16, and cools / heats the air. When the switching valve 53 is opened, the medium absorbing liquid hardly flows.

The low temperature regenerator 16 injects the medium absorbent liquid supplied through the medium absorbent liquid tube 26 toward the ceiling portion of the high temperature regeneration container 22.

Since the temperature in the low temperature regeneration vessel 31 is lower than the temperature in the high temperature regeneration vessel 22, the pressure in the low temperature regeneration vessel 31 is lower than the pressure in the high temperature regeneration vessel 22. Therefore, the medium absorbent liquid supplied from the medium absorbent liquid tube 26 into the low temperature regeneration container 31 is easily evaporated. When the medium absorbent liquid is injected into the ceiling portion of the high temperature regeneration vessel 22, the medium absorbent liquid is heated by the wall of the high temperature regeneration vessel 22, so that a part of the refrigerant contained in the medium concentration absorbent liquid evaporates to evaporate the refrigerant. The remainder becomes a high concentration absorbent liquid.

The upper side of the low temperature regeneration container 31 is in communication with the upper side of the condensation container 32 of the annular container shape by the communication section 33. Therefore, the vaporized refrigerant evaporated in the low temperature regeneration container 31 is supplied into the condensation container 32 through the communication section 33.

On the other hand, the high concentration absorbent liquid is dropped into the lower portion of the low temperature regeneration container 31 and supplied to the absorber 19 through the high concentration absorbent liquid tube 34 connected to the lower temperature regeneration container 31.

In addition, a ceiling plate 35 is installed above the low temperature regeneration container 31, and a gap 36 through which the vaporized refrigerant passes is formed between the outer circumferential end of the ceiling plate 35 and the low temperature regeneration container 31. It is.

(Description of Condenser 17)

The condenser 17 is covered by the condensation container 32 of the annular container shape. The condensation vessel 32 is formed so as to cover the upper periphery of the low temperature regeneration vessel 31, and a heat exchanger 37 for condensation for cooling and liquefying the vaporized refrigerant in the condensation vessel 32 is disposed therein. The heat exchanger 37 for condensation is an annular coil, in which cooling water flows. The vaporized refrigerant supplied from the low temperature regenerator 16 into the condensation vessel 32 is liquefied by being cooled by the heat exchanger 37 for condensation, and dropped into the lower side of the heat exchanger 37 for condensation.

On the other hand, the refrigerant is supplied to the lower side of the condensation container 32 through the liquefied refrigerant pipe 25 from the high temperature regenerator 15 described above. In addition, when this supply refrigerant is supplied into the condensation vessel 32, the boiling gas is boiled again by the pressure difference (low pressure of about 70 mmHg in the condensation vessel 32), so that the vaporized refrigerant and the liquefied refrigerant are supplied in a mixed state. The condensation vessel 32 is also connected with a liquefied refrigerant supply pipe 38 for guiding the liquefied refrigerant to the evaporator 18. The liquefied refrigerant supply pipe 38 is provided with a refrigerant valve 39 for controlling the supply amount of the liquefied refrigerant supplied from the condensation vessel 32 to the evaporator 18.

(Explanation of the evaporator 18)

The evaporator 18 is formed to cover the lower portion of the condensation vessel 32, that is, the lower side of the low temperature regeneration vessel 31 together with the absorber 19, and the low temperature regeneration vessel 31 is surrounded by an evaporation / annular container shape. It is covered by the absorption container 41. An evaporation heat exchanger 42 for evaporating the liquefied refrigerant supplied from the condenser 17 is disposed outside the evaporation / absorption vessel 41. The evaporation heat exchanger 42 is an annular coil, in which cold and hot water (heat medium) supplied to the indoor air conditioning means 4 flows. In addition, the liquefied refrigerant supplied from the condenser 17 through the liquefied refrigerant supply pipe 38 is disposed on the upper portion of the heat exchanger 42 for evaporation, and has an annular refrigerant spray port 43 having a plurality of spray pipes 43a. ) Is sprayed onto the heat exchanger 42 for evaporation.

Since the evaporation / absorption vessel 41 is maintained in a substantially vacuum (eg 6.5 mmHg) state, the boiling point is low, so that the liquefied refrigerant sprayed on the evaporation heat exchanger 42 is very easily evaporated. The liquefied refrigerant sprayed on the heat exchanger 42 for evaporation removes heat of vaporization from the heat medium flowing in the heat exchanger 42 for evaporation and evaporates.

As a result, the heat medium flowing in the heat exchanger 42 for evaporation is cooled. Then, the cooled heat medium is guided to the indoor air conditioner 4 to cool the room.

(Description of the absorber 19)

The absorber 19 is covered by the evaporation / absorption vessel 41 as described above. The absorber 19 has an absorption heat exchanger 44 for cooling the high concentration absorbent liquid supplied through the high concentration absorbent liquid tube 34 inside the evaporation / absorption vessel 41. This absorption heat exchanger (44) is an annular coil, in which cooling water for cooling the high concentration absorbent liquid sprayed onto the coil is supplied. In addition, the cooling water passing through the absorption heat exchanger 44 passes through the condensation heat exchanger 37 of the condenser 17 and is led to the cooling water cooling means 5 to be cooled. Then, the cooling water cooled by the cooling water cooling means 5 is led to the absorption heat exchanger 44 again.

On the other hand, in the upper part of the absorption heat exchanger 44, the annular absorbent liquid spraying port 45 for spraying the high concentration absorbent liquid supplied through the high concentration absorbent liquid pipe 34 on the absorption heat exchanger 44 is arrange | positioned. The high concentration absorbent liquid sprayed on the absorption heat exchanger 44 absorbs the vaporized refrigerant generated by evaporation in the heat exchanger 42 for evaporation while being dropped from the upper side to the lower side along the coil surface of the absorption heat exchanger 44. . As a result, the absorbent liquid dropped to the bottom of the evaporation / absorption vessel 41 becomes a low concentration absorbent liquid whose concentration is diminished.

In the evaporation / absorption vessel 41, a cylindrical partition wall 46 is disposed between the evaporation heat exchanger 42 and the absorption heat exchanger 44. The partition wall 46 is formed so as to open the vaporized refrigerant generated in the evaporator 18 into the absorber 19, for example, the upper side thereof so as to communicate with the evaporator 18 and the absorber 19.

In addition, a low concentration absorbing liquid pipe 47 for supplying the low concentration absorbing liquid dropped into the bottom of the evaporation / absorption container 41 to the boiling unit 14 is connected to the bottom of the evaporation / absorption container 41. The low concentration absorbent liquid pipe 47 is provided with a solution pump 48 for supplying the low concentration absorbent liquid to the boiling unit 14 in the evaporation / absorption vessel 41 which has become almost vacuum.

(Description of Component Parts Other Than Above in Absorption-type Refrigeration Cycle 2)

Reference numeral 51 shown in FIG. 1 denotes a high temperature heat exchanger 51a for heat-exchanging a medium concentration absorbent liquid flowing in the boiling vessel 21 to the low temperature regenerator 16 and a low concentration absorbent liquid flowing from the absorber 19 to the boiler 14. And a low temperature heat exchanger (51b) in which the high concentration absorbent liquid flowing from the low temperature regenerator 16 to the absorber 19 and the low concentration absorbent liquid flowing from the absorber 19 to the boiler 14 are integrated.

In addition, the high temperature heat exchanger 51a cools the medium absorbent liquid flowing from the boiling cylinder 21 to the low temperature regenerator 16 and heats the low concentration absorbent liquid flowing from the absorber 19 to the boiler 14. In addition, the low temperature heat exchanger 51b cools the high concentration absorbent liquid flowing from the low temperature regenerator 16 to the absorber 19 and, conversely, heats the low concentration absorbent liquid flowing from the absorber 19 to the boiler 14.

In addition, the absorption type refrigeration cycle 2 of this embodiment is provided with heating operation means for heating operation in addition to the cooling operation by the above operation.

The heating operation means includes a heating tube 52 for guiding a hot absorbent liquid to the lower part of the evaporator 18 at the lower part of the boiling tube 21 and a cooling / heating switching valve 53 for opening and closing the heating tube 52. It is composed. The cooling / heating switching valve 53 opens the valve at the time of heating operation and guides the hot absorbent liquid into the evaporation / absorption vessel 41, thereby drawing the cold / hot water flowing through the evaporator 18 in the evaporation heat exchanger 42. To heat.

(Explanation of the indoor air conditioning means 4)

The indoor air conditioning means (4) forcibly heat-exchanges indoor air with cold / hot water passing through the indoor heat exchanger (54) installed in the indoor unit (B) and the evaporator (18) flowing through the indoor heat exchanger (54). An indoor fan 55 (corresponding to the indoor blowing means of the present invention) for blowing air into the room is provided.

The indoor heat exchanger 54 is connected with a cold / hot water circuit 56 (corresponding to the thermal refrigerant circuit of the present invention) for circulating cold and hot water, and the cold / hot water circuit 56 is provided with a cold / hot water pump 57 for circulating cold and hot water. It is. In addition, the cold / hot water pump 57 is a tandem pump driven by a combined motor for driving the solution pump 48.

Therefore, since the hot and cold water pump 57 also operates when the solution pump 48 operates, the cold / hot water circuit 56 is provided with a valve V for controlling the flow rate of the hot and cold water flowing through the indoor heat exchanger 54, This valve V is installed in the indoor unit B together with the indoor heat exchanger 54 and the indoor fan 55.

The cold and hot water circuit 56 is a cold and hot water pipe that guides the cold and hot water passing through the evaporator 18 to the indoor heat exchanger 54 and guides the cold and hot water heat-exchanged with the indoor air to the evaporator 18 again. In addition to the above-described indoor heat exchanger 54 and the cold / hot water pump 57, a water tank 58 for storing cold and hot water as an expansion tank for heating and replenishing cold and hot water in the cold / hot water circuit 56 is provided. It is.

The water tank 58 is connected with a water supply pipe 59 for supplying cold and hot water (tap water) therein. The water supply pipe 59 is provided with a water supply valve 60 for supplying / blocking cold / hot water into the water tank 58. Since the water tank 58 is provided with a water level sensor (not shown), when the cooling water level in the water tank 58 decreases, the water supply valve 60 is opened to replenish the cold and hot water into the water tank 58.

Moreover, the water tank 58 is provided with the overflow water supply means 59a which guides the overflowed cold / hot water into the cooling water tank 65 mentioned later.

On the other hand, since a plurality of indoor units B can be connected in parallel to the cold / hot water circuit 56, each indoor unit B is formed to be controlled in a state where the plurality of indoor units B are connected to the outdoor unit A. FIG. Specifically, the valve (V) installed in each indoor unit (B) is capable of opening and closing to block the flow of cold and hot water with respect to the indoor unit (B) not in use, in addition to the flow rate adjustment function described above, and each indoor unit (B). The indoor control unit 6a provided for each is configured to independently control the indoor fan 55 and the valve V provided in the indoor unit B.

Moreover, this indoor control part 6a is connected with the main control part 6 provided in the outdoor unit A by the communication line T (corresponding to communication means), and the main control part 6 and the indoor control part 6a are connected. It is configured to communicate in two directions. As a specific example, when the cooling or heating instruction is given to the indoor unit B side, the instruction is sent to the main control unit 6 of the outdoor unit A via the communication line T, and conversely, the operating state of the outdoor unit A side. In response to this, an instruction signal of the main controller 6 is sent to the indoor controller 6a so that the operation state of the indoor unit B can be changed. It is also possible to form two-way communication not only by the communication line T but also by radio.

(Description of Cooling Water Cooling Means 5)

The cooling water cooling means 5 includes an evaporative cooling tower 61, a cooling water circuit 62 for circulating the cooling water, and a cooling water pump 63 for circulating the cooling water in the cooling water circuit 62.

The cooling tower 61 heats and radiates the cooling water passing through the absorber 19 and the condenser 17 by exchanging heat with the outdoor air while the cooling water flows from the upper side to the lower side, and evaporates the heat of vaporization in the cooling water during the evaporation. Take away the cooling water. Moreover, this cooling tower 61 is equipped with the cooling water fan 64 which produces | generates an airflow and promotes evaporation and cooling of cooling water.

The cooling water circuit 62 guides the cooling water whose temperature rises while passing through the absorber 19 and the condenser 17 to the cooling tower 61, and again transfers the cooling water cooled in the cooling tower 61 to the absorber 19 and the condenser ( As a water pipe sent to 17), the cooling water circuit 62 is provided with a cooling water tank 65 for storing cooling water in addition to the cooling tower 61 and the cooling water pump 63 described above.

The cooling water tank 65 is installed below the cooling tower 61 and below the water tank 58, and the cooling water passing through the cooling tower 61 is supplied, and the water overflowed from the water tank 58 is supplied. .

In addition, the cooling water tank 65 is equipped with the water level sensor which is not shown in figure. Therefore, when the coolant level in the coolant tank 65 is lowered, the water supply valve 60 is opened to overflow the water in the water tank 58, and the overflowed water is supplied to the coolant tank 65 through the overflow water supply unit 59a. It is led to the inside and supplements the cooling water.

(Description of Main Control Unit 6)

The main control unit 6, according to the operation instruction sent from the controller (not shown) installed in each indoor unit (B) through the communication line (T) or the input signal of each of the plurality of installed sensors, the refrigerant valve 39, the solution pump ( 48) {Cold / hot water pump 57}, cooling / heating switching valve 53, water supply valve 60, the cooling water pump 63, electrical functional parts such as cooling fan 64 and the electrical function of the combustion device (3) While controlling components (the combustion fan 13, the gas flow control valve 66, the gas open / close valve 67, the ignition device 68, etc.), the indoor fan 55 of the indoor unit B through the communication line (T). ) Or the valve (V).

(Operation Description of Cooling Operation)

When the cooling operation is instructed by the controller of the indoor unit B, the combustion device 3, the cooling water cooling means 5, and the solution pump 48 (cold and hot water pump 57) are operated by the main control unit 6. In addition, the indoor control unit 6a of the indoor unit B, which is instructed to cool, turns on the indoor fan 55, and opens the valve V thereof.

In the absorption refrigeration cycle (2), the combustion device (3) heats the low concentration absorbent liquid in the high temperature regenerator (15) to obtain vaporized refrigerant from the low concentration absorbent liquid in the high temperature regenerator (15), and at the low temperature regenerator (16). A vaporized refrigerant is obtained from the absorbent liquid.

The vaporized refrigerant obtained in the high temperature regenerator 15 and the low temperature regenerator 16 is condensed and liquefied in the condenser 17, and then sprayed onto the evaporation heat exchanger 42 of the evaporator 18, and the evaporation heat exchanger 42 in the evaporation heat exchanger 42 It evaporates by taking the heat of vaporization from the cold and hot water. Therefore, the cold and hot water cooled through the evaporation heat exchanger 42 is supplied to the indoor heat exchanger 54 of the indoor unit B through the cold and hot water circuit 56, and heat exchanges with the air blown into the room to cool the room. .

The vaporized refrigerant evaporated in the evaporator 18 is introduced into the absorber 19.

On the other hand, in the absorber 19, the high concentration absorbent liquid obtained from the low temperature regenerator 16 is sprayed on the absorption heat exchanger 44 through the absorbent liquid spraying hole 45, and the vaporized refrigerant introduced into the high concentration absorbent liquid from the evaporator 18. Is absorbed. In addition, the heat of absorption generated when the vaporized refrigerant is absorbed in the high concentration absorbent liquid is absorbed by the heat exchanger 44 for absorption, thereby preventing a decrease in the absorption capacity.

Then, the high concentration absorbent liquid absorbing the vaporization refrigerant in the absorber 19 becomes a low concentration absorbent liquid, is sucked by the solution pump 48, and returned to the boiler 14 again, and the above cycle is repeated.

(Explanation of operation of heating operation)

When the heating operation is instructed by the controller of the indoor unit B, the combustion device 3 and the solution pump 48 (cold and hot water pump 57) are operated by the main control unit 6, and the cooling / heating switching valve ( The indoor control unit 6a of the indoor unit B in which the heating unit 53 is opened and the heating unit 53 is opened, turns the indoor fan 55 on, and opens the valve V.

When the combustion device 3 heats the absorbent liquid in the high temperature regenerator 15, the heated high temperature absorbent liquid is guided to the lower part of the evaporator 18 through the heating tube 52, and the heat exchanger 42 for evaporation of the evaporator 18. Heat the cold and hot water flowing inside. Therefore, the cold and hot water heated through the evaporation heat exchanger 42 is supplied to the indoor heat exchanger 54 of the indoor unit B through the cold and hot water circuit 56, and heat-exchanges with the air blown into the room to heat the room. .

(Explanation of dilution operation control)

The main control unit 6 stops the combustion of the combustion device 3 when the cooling operation is stopped and the solution pump 48 until the temperature of the absorbent liquid in the high temperature regenerator 15 drops to a predetermined temperature (eg, 110 ° C.). After cooling, the dilution operation means 6b and the temperature of the absorbent liquid in the high temperature regenerator 15 are reduced to a predetermined temperature (for example, 110 ° C) by stopping the combustion of the combustion device 3 when the heating operation is stopped. After heating, the dilution operation means 6c for operating the solution pump 48 is formed.

Thus, the main control part 6 is equipped with at least the temperature sensor 70 for detecting the temperature of the absorption liquid in the high temperature regenerator 15. As shown in FIG.

After cooling, the dilution operation means 6b stops the combustion of the combustion device 3, stops the indoor fan 55, closes the valve V, and the temperature of the absorbing liquid in the high temperature regenerator 15 reaches a predetermined temperature. The operation of the cooling water cooling means 5 is continued until it is lowered.

On the other hand, the dilution operation means 6c after heating stops the combustion of the combustion apparatus 3 and stops the indoor fan 55 until the temperature of the absorbing liquid in the high temperature regenerator 15 falls to predetermined temperature, and the indoor unit The valve V of (B) is opened.

Control by this dilution operation means 6c after heating is demonstrated using the flowchart of FIG.

The heating stop time is given to all the controllers of the indoor unit B during the heating operation (or the room temperature detected by the indoor control unit 6a of the indoor unit B during the heating operation reaches the set temperature to generate the heating stop time). When the operation stop time is given to the main control unit 6 through the communication line T, or when the main control unit 6 stops heating operation for safe operation (start), combustion of the combustion device 3 occurs. And the operation of the indoor fan 55 which was operated until the heating operation was stopped, and the operation of the solution pump 48 and the hot and cold water pump 57 was continued, and each indoor unit B was stopped. Each valve V provided in the opening is opened (step 1).

Subsequently, it is judged whether or not the temperature of the absorbing liquid in the high temperature regenerator 15 detected by the temperature sensor 70 has dropped below 110 ° C (step S2). If this determination result is NO, the flow returns to step S2. If the determination result in step S2 is YES, it is determined that the absorbent refrigeration cycle 2 has been diluted to the extent that the absorbent liquid therein is not crystallized even when the absorption refrigeration cycle 2 drops to the outside temperature, and all the operations of the absorbent air conditioner 1 are stopped ( Step S3), the dilution operation after heating is completed.

(Operation of dilution operation after heating)

The operation of the absorption type air conditioner 1 by the control shown in the flowchart will be described.

When the heating operation is stopped, the solution pump 48 is operated until the temperature of the absorbent liquid in the high temperature regenerator 15 is lowered to 110 ° C. while the combustion of the combustion device 3 is stopped, so that the absorbent liquid in the absorption refrigeration cycle 2 is stopped. Circulate At this time, the main controller 6 gives a stop command signal to the indoor controllers 6a of all the indoor units B through the communication line T, and each indoor controller 6a stops each indoor fan 55. At the same time opening the valve (V) at the same time operating the cold and hot water pump (57) to circulate the cold and hot water of the cold and hot water circuit (56).

In this way, the cold and hot water radiated by the indoor heat exchanger (54) is led to the heat exchanger (42) of the evaporator (18), and the heat is taken from the hot absorbent liquid circulating through the evaporator (18). Repeat the heat dissipation cycle. On the other hand, since the absorbing liquid flowing through the evaporator 18 loses heat by cold / hot water circulating in the cold / hot water circuit 56, the temperature is lowered by repeating the above cycle.

That is, since the absorbing liquid circulating in the absorption type refrigeration cycle 2 by the operation of the solution pump 48 is radiated by the indoor heat exchanger 54 through the cold / hot water circuit 56, the temperature decreases in a short time as compared with the prior art.

When the temperature of the absorbing liquid in the high temperature regenerator 15 drops to 110 ° C, the dilution operation after heating is completed.

(Effect of Example)

As shown in the operation of the dilution operation after heating, when the heating operation is stopped, the absorbent liquid circulating in the absorption refrigeration cycle 2 is radiated from the indoor heat exchanger 54 through the cold / hot water circuit 56 so that the temperature is shortened. Since it falls, the dilution operation after heating is completed in a short time compared with the conventional one.

In this way, at the end of the heating operation, since a heat radiation circuit for radiating the high temperature absorbent liquid in the absorption refrigeration cycle 2 to the inside is actively radiated, the power consumption required for the dilution operation at the end of heating can be reduced.

In addition, the absorption type air conditioner 1 of this embodiment is a multi-air conditioner in which a plurality of indoor units B are connected to one outdoor unit A. When the dilution operation after heating operation is performed, all of the indoor units B Since it is formed so as to radiate heat in the indoor heat exchanger 54, the amount of heat dissipation is large and the dilution operation after heating can be greatly shortened.

(Variation)

In the above embodiment, in the dilution operation after heating, an example is shown in which the dilution time after heating is shortened by opening all the valves V installed in each indoor unit B to increase the amount of heat radiation, but the heating operation is stopped. Only the valve V of the indoor unit B which has been operated until it may be continued to be opened. In this way, since the heat of the absorbing liquid can be radiated only in the room in which the heating is stopped, the problem of rapidly decreasing the temperature of the room in which the heating is stopped can be suppressed.

In the above embodiment, in the dilution operation after heating, the indoor fan 55 is stopped to prevent the heat of the absorbent liquid supplied to the indoor heat exchanger 54 from being blown into the room so that the room temperature does not rise after the heating is stopped. Although one example is shown, when the room temperature drops rapidly after a heating stop such as in a cold, the indoor fan 55 may be operated during the dilution operation after heating to suppress the sudden drop of the room temperature after the heating stops. . In particular, this means is effective when the indoor temperature reaches the set temperature during the heating operation to stop the heating operation, and operates the indoor fan 55 in the room during the dilution operation during the heating thermo off. You may form so that it may be made.

In the above embodiment, the heat medium (cold and hot water) is supplied to the indoor heat exchanger 54 during the dilution operation after heating, but the heat medium (cold and hot water) is supplied to the indoor heat exchanger 54 during the dilution operation after cooling. You may form. That is, the valve V may be opened during the dilution operation after cooling. When formed in this way, since the cold heat of the heat medium (cold and hot water) cooled during cooling is discharged | emitted to the room, it can suppress that a room temperature rises rapidly after cooling stop.

In the above embodiment, although the absorption type air conditioner 1 of the multi-air conditioner which can be connected to the plurality of indoor units B to one outdoor unit A is shown, one indoor unit B is to one outdoor unit A. You may apply this invention to the absorption type air conditioner 1 connected.

In the above embodiment, an example in which the electric functional part of the indoor unit B is controlled by the indoor control unit 6a independent of the main control unit 6 is shown, but the electric functional part of the indoor unit B is also directly controlled by the main control unit 6. It may be formed to control.

Although the flow rate of the heat medium (cold and hot water) of the indoor heat exchanger 54 was adjusted or interrupted by opening / closing the valve V, the heat medium pump (cold and hot water pump 57) was independent of the solution pump 48. It may be formed so as to operate, and may be formed so as to regulate or interrupt the flow rate of the heat medium (cold and hot water) by the operation of the heat medium pump.

In the above embodiment, as an example of the absorption type refrigeration cycle, the dual-use type absorption refrigeration cycle 2 is shown as an example, but the single-use type absorption refrigeration cycle may be used, or triple or more types of multi-effect type absorption refrigeration cycles may be used. Moreover, although the example which injected | poured from the upper side of the low temperature regenerator 16 was shown when the medium concentration absorption liquid is injected into the low temperature regenerator 16, you may inject from the lower side.

As a heating means, a gas combustion device 3 for burning gas is used, but other combustion devices such as a petroleum burning device for burning petroleum may be used, and a heating means or an electric heater for heating the absorbing liquid by exhaust heat of the internal combustion engine may be used. You may use other heating means, such as a used heating means.

Although the condensation heat exchanger 37, the evaporation heat exchanger 42, and the absorption heat exchanger 44 were formed in the form of a coil, a heat exchanger of another type such as a tube and fin or a stacked heat exchanger was used. You may also

As an example of the absorbent liquid, an aqueous lithium bromide solution is shown as an example, but other absorbent liquids such as ammonia aqueous solution using ammonia as the refrigerant and water as the absorbent may be used.

As an example of the heat medium, tap water is used, and an example in which the water is used in common with the cooling water in the refrigerant water circuit is shown. However, another heat medium such as an antifreeze or oil different from the cooling water in the cooling water circuit may be used.

As described above in detail, according to the present invention, when the heating operation is stopped, the absorbent liquid circulating in the absorption refrigeration cycle is radiated from the indoor heat exchanger through the heat medium circuit, so that the temperature of the absorbent liquid decreases in a short time. The dilution operation after heating is finished. In addition, since the heat dissipation circuit for dissipating the hot absorbent liquid into the room is actively radiated at the end of the heating operation, the power consumption required for the dilution operation at the end of the heating operation can be reduced.

Claims (3)

a) heating means for heating the absorbent liquid, b) During the cooling operation, a regenerator for vaporizing a part of the absorbed liquid heated by the heating means, a condenser for cooling and liquefying the vaporized refrigerant generated in the regenerator, and a liquefied refrigerant liquefied in the condenser is evaporated under low pressure to heat refrigerant. An evaporator for cooling the gas, an absorber for absorbing the vaporized refrigerant evaporated in the evaporator into the absorbent liquid, and a solution pump for pumping the absorbent liquid in the absorber into the regenerator; In a heating operation, an absorption refrigeration cycle for directing the absorbent liquid heated by the heating means to the evaporator to heat the heat medium flowing in the evaporator, and for conveying the absorbent liquid led to the absorber to the regenerator by the solution pump; , c) an indoor blowing means installed indoors for generating an air flow blown into the room, an indoor heat exchanger for exchanging heat blown with the air blown into the room, and inducing the heat medium cooled or heated in the evaporator to the indoor heat exchanger; A heat medium circuit for directing the heat medium heat-exchanged with indoor air in the indoor heat exchanger to the evaporator, the air conditioner installed in the heat medium circuit and having a heat medium pump for circulating the heat medium; d) stopping the heating of the absorbent liquid by the heating means when stopping the heating operation, and circulating the absorbent liquid in the absorption refrigeration cycle by the solution pump until the temperature of the absorbent liquid in the regenerator decreases to a predetermined temperature; In addition, after heating dilution operation means for the dilution operation after heating to circulate the heat medium in the heat medium circuit by the heat medium pump, Absorption air conditioning apparatus comprising a. The method according to claim 1, The solution pump and the heat medium pump is a tandem pump driven by a common motor, Absorption air conditioning apparatus characterized in that the flow rate control of the heat medium in the heat medium circuit during the operation of the solution pump is performed by a valve provided in the heat medium circuit. The method according to claim 2, The main control unit for controlling the absorption refrigeration cycle is installed outdoors with the absorption refrigeration cycle as an outdoor unit, The valve, the indoor heat exchanger and the indoor blowing means are installed indoors as an indoor unit, and a plurality of indoor units can be connected in parallel to the heat medium circuit, and the indoor units independently control the valve and the indoor blowing means. Equipped with an indoor control unit, The main control unit and the indoor control unit perform two-way communication through a communication means, and when the indoor control unit receives the instruction of the post-dilution after heating operation formed in the main control unit to stop heating operation, the operation of the indoor blowing means is stopped. Absorption air conditioner, characterized in that for circulating a heat medium to the indoor heat exchanger by opening the valve in a stopped state.

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