JP2000055498A - Absorption type heat pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing costs by simplifying the device structure. SOLUTION: A refrigerant liquid spraying means 9B is installed at almost the middle part of a rectifying device 2, a part of a condenser 3 is positioned right above a rectifying tower 6, and other parts are so installed as to deviate from right above the rectifying tower 6. Further, a plurality of fins are installed on a heat exchanger tube 42 provided inside the condenser 3 positioned right above the rectifying tower 6, and refrigerant liquid A radiated and condensed to cooling water E by means of the fin supplied into the heat exchanger tube 42 is dripped on a filler 10 of the rectifying tower 6 from the lower end of the fin 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption heat pump device used for a heating / cooling machine, a water heater and the like.

[0002]

2. Description of the Related Art Conventionally, as this type of absorption heat pump device, for example, one having a structure shown in FIG. 3 has been proposed.

[0003] In FIG. 3, an absorption heat pump device denoted by reference numeral 1X heats an absorption liquid C containing a refrigerant A for heat exchange, vaporizes the refrigerant A from the absorption liquid C, and forms a refrigerant A and an absorption liquid B. A condenser 3 for condensing and liquefying the refrigerant vapor A supplied from the rectifier 2, and the refrigerant liquid A supplied from the condenser 3 is supplied to the inside. At the same time, an appropriate heat medium that is forcibly brought into contact with the outer surface, for example, an evaporator 4 that removes latent heat of evaporation from the outside air D to vaporize the refrigerant liquid A, and a refrigerant vapor A supplied from the evaporator 4,
Reactor 2 absorbs refrigerant A by reacting with absorbent B supplied from rectifier 2 to produce absorbent C containing refrigerant A, and circulates absorbent C to rectifier 2. And an absorber 5 to be used.

[0004] The rectifier 2 is an upright cylindrical rectification tower 6.
And a regenerator 8 provided below the rectification tower 6 and provided with a burner 7 for heating the absorbing liquid C containing the refrigerant A and functioning as a heating unit. Refrigerant liquid spraying means 9A for spraying the refrigerant liquid A into the rectification tower 6.
And an absorbent dispersing means 9B for dispersing the absorbing liquid C in the rectification tower 6, and a refrigerant liquid dispersing means 9A and a regenerator 8 interposed therebetween. The condenser 3 is provided with a refrigerant liquid tank 11 for storing the condensed refrigerant A and a refrigerant liquid spraying means 9A.

[0005] The evaporator 4 is composed of a plurality of heat transfer tubes 12 erected.
An upper header 13 for connecting the upper ends of the heat transfer tubes 12 to each other, a lower header 14 for connecting the lower ends of the heat transfer tubes 12 to each other, and a lengthwise direction of the heat transfer tubes 12. A large number of heat transfer fins 15 are provided at intervals and the heat transfer tubes 12 are fixed in a penetrating state.
Further, the refrigerant liquid tank 11 communicates with the upper end of each heat transfer tube 12 via the refrigerant liquid supply pipe 16, and the upper header 13 communicates with the upper part of the absorber 5 via the communication pipe 17. Further, the lower header 14 communicates with the absorbent tank 19 provided at the lower end of the absorber 5 via the communication pipe 18.

On the other hand, the absorber 5 has an absorbing droplet lowering means 20 to which a communicating pipe 17 connected to the upper header 13 of the evaporator 4 is connected, and an interval below the absorbing droplet lowering means 20. A plurality of heat transfer tubes disposed therein for storing the absorbing liquid B that has absorbed the refrigerant by reacting with the refrigerant vapor A, that is, the absorbing liquid C, and a plurality of heat transfer tubes communicating the absorbing liquid dropping means 20 with the absorbing liquid tank 19; And an exterior body 2 provided around the heat transfer tubes 21 and forming a cooling water flow path 22 between the absorbing liquid dropping means 20 and the absorbing liquid tank 19.
The evaporator 4 is configured to suck the vaporized refrigerant A in the heat transfer tube 12 of the evaporator 4 by lowering its internal pressure.

[0007] Absorbing liquid dropping means 20 is connected to an absorbing liquid supply pipe 24 for supplying the absorbing liquid B concentrated in the regenerator 8 at an upper portion thereof. A dispersing plate 25 arranged so as to be divided is mounted, a heat transfer tube 21 is fixed below the dispersing plate 25, and the absorbing droplet lowering means 20 and the cooling water flow path 22 are separated from each other. A communication pipe 17 is connected between the partition 26 and the dispersion plate 25, and the vaporized refrigerant A is sent from the evaporator 4 through the communication pipe 17.

Further, the absorbing liquid tank 19 communicates with the absorbing liquid dispersing means 9B of the rectifier 2 through an absorbing liquid returning pipe 27. Liquid dispersing means 9B for absorbing liquid C stored in
An absorption liquid circulating pump 28 is provided for feeding the liquid to the pump.

The upper end of the outer package 23 of the absorber 5 and the condenser 3
A cooling water pipe 29 is provided between the condenser 3 and the lower end of the exterior body 23 of the absorber 5 to provide communication between them. The outer body 23, the cooling water pipe 29,
A closed circuit for cooling water circulation is formed by the condenser 3 and the cooling water pipe 30, and an indoor unit 31 for heating and a cooling water circulation pump 32 for circulating the cooling water E are provided in the middle of the cooling water pipe 30. Is provided.

Reference numeral 33 denotes a heat exchanger for exchanging heat between the absorption liquids flowing through the absorption liquid supply pipe 24 and the absorption liquid return pipe 27, respectively, and reference numeral 34 denotes an evaporator 4.
Shows a blower fan for supplying outside air D to
Reference numeral 35 denotes a heat exchanger that exchanges heat between the cooling water E supplied to the absorber 5 and the absorbing liquid B supplied to the absorbing liquid dropping means 20.

In the absorption heat pump apparatus 1X constructed as described above, a part of the refrigerant liquid liquefied in the condenser 3 is returned to the upper part of the rectification tower 6 from the refrigerant liquid spraying means 9A, and most of the refrigerant liquid is stored in the refrigerant liquid tank 11 Enter and accumulate. The refrigerant liquid A sprayed and returned from the refrigerant liquid spraying means 9A to the rectification tower 6 is re-evaporated here, and the ratio of the refrigerant vapor A contained in the vapor entering the condenser 3 is increased. I have.

On the other hand, the refrigerant liquid A stored in the refrigerant liquid tank 11
Is supplied to each heat transfer tube 12 via the refrigerant liquid supply tube 16 and flows down along each inner wall surface. At this time, the outside air D supplied by the blower fan 34 to the heat transfer fins 15 and the surface of the heat transfer tube 12 Since it is in contact, heat exchange is performed between the outside air D and the refrigerant liquid A flowing down the inner wall surface of the heat transfer tube 12, and the refrigerant liquid A deprives the outside air D of vaporizing latent heat and evaporates. The refrigerant vapor A thus generated moves upward in each heat transfer tube 12, is collected by the upper header 13 provided at the upper end of the heat transfer tube 12, and flows into the absorber 5.

The refrigerant vapor A flowing into the absorber 5 comes into contact with the absorption liquid B supplied from the regenerator 8 and is absorbed by the absorption liquid B. Is collected in the absorption liquid tank 19, and the absorption liquid C
Is transported to the rectifier 2 by the absorbent circulation pump 28,
It is sprayed into the rectification tower 6 from the absorbing liquid spraying means 9B.

The absorbing liquid C sent to the rectification tower 6 is heated by the combustion heat generated by the burner 7 while flowing down through the space between the fillers 10 to vaporize and separate the absorbed refrigerant A. Absorbent B accumulates in regenerator 8.

The refrigerant vapor A separated and generated in the rectifier 2 exchanges heat with the cooling water E when passing through the condenser 3 and radiates heat to the cooling water E. When passing through the absorber 5, When the refrigerant A evaporates, the heat absorbed from the outside air D is transferred to the cooling water E.

That is, the cooling water E is supplied to the absorber 5 and
It is gradually heated while circulating to the condenser 3 and then sent to the indoor unit 31 for heating.

In such an absorption heat pump device 1X, the heat energy of the outside air D is absorbed to assist the heating of the cooling water E, and the amount of heat radiation from the indoor unit 31 with respect to the amount of heat generated by the burner 7 is reduced. 1.3 times or more can be achieved.

[0018]

However, in the absorption heat pump apparatus having the above structure, a part of the refrigerant liquid liquefied in the condenser is returned to the upper part of the rectifier, where it is re-evaporated to the condenser. It can be operated at a condensing temperature of about 50 to 60 ° C. and an evaporating temperature of about −20 to −10 ° C. so as not to be restricted by the High Pressure Gas Safety Law.
Even when 2,2-trifluoroethanol (hereinafter, referred to as TFE) or the like is used as a refrigerant and N-methyl-2-pyrrolidone (hereinafter, referred to as NMP) or the like is used as an absorbing solution, it enters the condenser. Since the ratio of the refrigerant to the steam was not reduced, there was a problem that the upper structure of the rectifier was complicated and the production cost was increased, and this had been a problem to be solved.

[0019]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in the prior art, the present invention provides a rectifier provided with a heating unit for heating an absorbing liquid to vaporize and separate a refrigerant contained in the absorbing liquid,
A condenser that liquefies the refrigerant vapor supplied from the rectifier by exchanging heat with the first heat medium, and an evaporation that vaporizes the refrigerant liquid supplied from the condenser by exchanging heat with the second heat medium. And reacts the refrigerant vapor supplied from the evaporator with the absorbing liquid supplied from the rectifier to absorb the refrigerant into the absorbing liquid, and returns the absorbing liquid having absorbed the refrigerant to the rectifier. An absorption heat pump apparatus having a first configuration, wherein a condenser is connected to a rectifier and an alcohol-based fluid is used as a refrigerant;

In the absorption heat pump apparatus of the first configuration, a part of the condenser is located directly above the rectifier, and the other part is located at a position off the rectifier. 2 is provided.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In addition, in order to facilitate understanding, in these figures, parts having the same functions as those described in FIG. 3 are denoted by the same reference numerals.

The absorption heat pump apparatus 1 of the present invention has a fluid whose boiling point is much lower than that of water used as a refrigerant when an aqueous solution of lithium bromide is used as an absorbing liquid, for example, has a boiling point of 7.
In this method, 4.5 ° C. TFE or the like is used as a refrigerant, and NMP or the like having a boiling point of 204 ° C. is used as an absorbing liquid.

Further, in the absorption heat pump device 1 in this case, a cooling water tank 41 is provided in the cooling water pipe 30.

In the absorption type heat pump apparatus 1, the rectifier 2 does not include the refrigerant liquid dispersing means 9A on the upper side, which is conventionally provided, and only the refrigerant liquid dispersing means 9B is installed substantially in the middle. A part of the condenser 3 is located directly above the rectification tower 6, and the other part is provided so as to be off from directly above the rectification tower 6.

As shown in FIG. 2, a plurality of fins 43 are installed in the heat transfer tube 42 disposed inside the condenser 3 located directly above the rectification tower 6. The coolant liquid A that has radiated heat to the supplied cooling water E via the fins 43 and condensed drops from the lower end of the fins 43 onto the filler 10 of the rectification tower 6. The fin 43
Is preferably provided at about 7 to 9 sheets / inch.

In this case, the absorption heat pump device 1 is of a type in which the evaporator 4 has a large number of heat transfer tubes 12 built therein, and the water F stored in the cold water tank 44 inside these heat transfer tubes 12 is On the way, chilled water circulation pump 45 and on-off valve 4
6 can be circulated and supplied through a cold water pipe 47 having

On the other hand, a refrigerant liquid dispersing means 48 is provided on the upper inside of the evaporator 4, and the refrigerant liquid A condensed by the condenser 3 and stored in the refrigerant liquid tank 11 can be supplied to the refrigerant liquid dispersing means 48. As described above, the refrigerant liquid supply pipe 16 having the on-off valve 49 is connected to the upstream portion, and the water F flowing through the pipe when the refrigerant liquid A sprayed from the refrigerant liquid spraying means 48 flows down the outer surface of the heat transfer pipe 12. It is configured to take heat from and evaporate.

In the absorption heat pump apparatus 1 having the above-described structure, the heat is heated by the combustion heat generated by the burner 7,
Part of the vapor that has been vaporized in the rectification tower 6 and entered the condenser 3 is liquefied by contacting the fins 43 of the heat transfer tube 42 directly above the rectification tower 6 through which the cooling water E flows. 6 and re-vaporizes here and enters the condenser 3, so that the ratio of TFE, which is a refrigerant having a low evaporation temperature, rises inside the condenser 3, and the ratio of NMP, which is an absorption liquid having a high evaporation temperature, is increased. descend.

Then, a liquid having a high refrigerant purity liquefied in the condenser 3, ie, a liquid simply called a refrigerant liquid, is stored in the refrigerant liquid tank 11 and supplied to the evaporator 4.

In the absorption heat pump apparatus 1 having the above structure, for example, if the indoor unit 31 shown in FIG. 3 is installed in the cooling water tank 41, the inside of the absorber 5 and the condenser 3 is cooled, and The cooling water E whose temperature has been increased is supplied to the cooling water pipe 29,
Since the air is circulated and supplied to the indoor unit 31 through the indoor unit 30, a heating action is performed in the indoor unit 31.

On the other hand, if the indoor unit 31 shown in FIG.
Is vaporized to radiate heat, and the water F whose temperature is lowered is circulated and supplied to the indoor unit 31 via the cold water pipe 47, so that the indoor unit 31 performs a cooling action.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

For example, the filler 10 to be filled in the rectification tower 6 may be a stainless steel wire mesh or a combination of thin wires.

Further, the absorption heat pump apparatus 1 of the present invention
In, a fluorinated alcohol-based fluid having a boiling point of 120 ° C. or lower can be used as a refrigerant, and ethers, esters, polyols, amides, amines,
Imides, ketones, aldehydes, nitriles and the like can be used.

[0035]

As described above, according to the present invention, an L-shaped refrigerant vapor pipe connecting the rectifier and the condenser, the refrigerant liquid extending from the condenser to the upper part of the rectification tower. Since the return pipe and the coolant liquid spraying means can be omitted, the configuration is simplified,
Manufacturing costs can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a main part of one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1.1 * Absorption type heat pump apparatus 2 Rectifier 3 Condenser 4 Evaporator 5 Absorber 6 Rectification tower 7 Burner 8 Regenerator 9A Refrigerant liquid spraying means 9B Absorbent liquid dispersing means 10 Filler 11 Refrigerant liquid tank 12 Heat transfer pipe 13 Upper header 14 Lower header 15 Heat transfer fin 16 Refrigerant liquid supply pipe 17/18 Communication pipe 19 Absorbing liquid tank 20 Absorbing liquid dropping means 21 Heat transfer pipe 22 Cooling water passage 23 Outer body 24 Absorbing liquid supply pipe 25 Dispersion plate 26 Partition 27 Absorption Liquid return pipe 28 Absorbent liquid circulation pump 29/30 Cooling water pipe 31 Indoor unit 32 Cooling water circulation pump 33 Heat exchanger 34 Blower fan 35 Heat exchanger 41 Cooling water tank 42 Heat transfer pipe 43 Fin 44 Cold water tank 45 Cold water circulation pump 46 Open / close valve 47 Cold water pipe 48 Refrigerant liquid spraying means 49 On-off valve

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshio Kubo 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 3L093 AA05 BB01 BB22 BB29 BB43 LL01 MM02

Claims (2)

[Claims] 1. A rectifier provided with a heating unit for heating an absorption liquid to vaporize and separate a refrigerant contained in the absorption liquid, and a refrigerant vapor supplied from the rectifier to a first heat medium. A condenser that liquefies by exchanging heat, an evaporator that evaporates by exchanging the refrigerant liquid supplied from this condenser with the second heat medium, and a refrigerant vapor and rectifier that are supplied from this evaporator In the absorption heat pump device having a reaction between the supplied absorption liquid and the absorption liquid to absorb the refrigerant and returning the absorption liquid having absorbed the refrigerant to the rectifier, the condenser is rectified by the rectifier. Characterized by using an alcohol-based fluid as a refrigerant. 2. The absorption heat pump device according to claim 1, wherein a part of the condenser is located directly above the rectifier, and the other part is located off the rectifier. Absorption type heat pump device.