JP2002544462A - Absorption refrigerator - Google Patents

Abstract

(57) Abstract: An absorption refrigerator (2) provided with a generator (4) for boiling and separating water from a lithium bromide / water solution. The generator (4) has an upper tank (42) and a lower tank (36) .The two tanks (42, 36) are a heat exchange tube (38) through which the solution flows upward and a heat exchange tube through which the solution flows downward. They are connected by a siphon tube (58). The heat exchange tube (38) is arranged so as to intersect the combustion products flowing from the burner (50) to the combustion chamber (46), and the thermosiphon tube (58) is insulated from the combustion products by the heat partition means. I have. The upper tank (42) includes a weak solution inlet (68) facing the upper end of the thermosiphon tube (58), a vapor outlet (72), a vertical baffle plate (80, 82) forming a stagnation zone (78), and a concentrator. It has an outlet (70) for lithium bromide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to an absorption refrigerator in which a refrigerant is dissolved in a liquid absorbent so as to form a refrigerant solution dissolved in the absorbent.

More particularly, the present invention relates to a generator for such an absorption refrigerator, which heats a refrigerant solution to boil off the refrigerant from the absorbent in order to separate the gaseous refrigerant from the absorbent.

An object of the present invention is to provide an absorption refrigerator having improved transfer efficiency of a refrigerant solution.

According to the present invention, there is provided an absorption refrigerator in which a refrigerant is dissolved in a liquid absorbent so as to form a refrigerant solution dissolved in the absorbent. A generator for heating the refrigerant solution, the generator having an upper tank and a lower tank containing the refrigerant solution during use, and for transferring the refrigerant solution upward from the lower tank to the upper tank. Means for transferring the refrigerant solution downward from the upper tank to the lower tank, and means for supplying a high-temperature heating gas along the high-temperature gas flow path, and transferring the refrigerant solution upward. The means for disposing the refrigerant solution is disposed in the high-temperature gas channel so that the refrigerant solution is heated by the high-temperature heating gas, and the means for transferring the refrigerant solution downward is disposed entirely or almost entirely outside the high-temperature gas channel. Characterized by being sucked A collection refrigerator is provided.

[0005] Preferably, the means for transferring the refrigerant solution upward from the lower tank to the upper tank comprises a heat exchange tube, the heat exchange tube comprising a hot heated gas and a solution in the heat exchange tube. Preferably, means for transferring the refrigerant solution downward from the upper tank to the lower tank are arranged in the hot gas flow path for heat exchange during:
It has at least one thermosiphon tube extending from one tank to the other tank and communicating with each tank, and the refrigerant solution flows from the upper tank through the thermosiphon tube to the lower tank.

[0006] Preferably, the means for transporting the refrigerant solution upward extends substantially perpendicularly to the flow direction of the hot gas along the hot gas flow path.

One or more heat exchange tubes are disposed upstream of one or more other heat exchange tubes with respect to the direction of the hot gas flow along the hot gas flow path. Advantageously, the other heat exchange tubes have an external heat collecting arrangement composed of fins.

The heat exchange tubes may be arranged in an array of rows extending across the hot gas flow path. Each row is composed of a plurality of heat exchange tubes spaced from each other, and these rows are arranged one by one along the hot gas flow path, and one row of heat exchange tubes is connected to the adjacent row of heat exchange tubes. Staggered with respect to the exchange tube.

[0009] Preferably, the thermosiphon tube is separated from the flow channel by a thermal partition means.

[0010] An inlet for supplying the coolant solution leads to the tank, and a thermosiphon tube leads to the tank adjacent to or opposite to the inlet. An inlet for supplying the refrigerant solution communicates with the upper tank, and a thermosiphon tube is adjacent to the inlet or for receiving a weak solution that the inlet discharges and is weakened by the refrigerant dissolved in the absorbent. Advantageously, it is substantially opposite to the upper tank.

In another embodiment, the inlet for supplying the coolant solution communicates with at least one thermosiphon tube.

Each of the tanks has an upstream end and a downstream end with respect to the flow direction of the hot gas along the hot gas flow path. The thermosiphon tube may communicate with the lower tank adjacent the upstream end of the lower tank. The plurality of heat exchange tubes may communicate with the lower tank adjacent the upstream end of the lower tank. The thermosiphon tube may communicate with the upper tank adjacent the upstream end of the upper tank. An inlet for supplying the coolant solution may communicate with the upper and / or lower tank adjacent the upstream end of the upper and / or lower tank. .

The outlet for the absorbent comes out of the upper tank. If desired, a stagnation zone is provided in the upper tank adjacent to the absorbent outlet.

Hereinafter, the present invention will be further described with reference to the accompanying drawings.

In the drawings, like reference numbers indicate identical or similar components.

As shown in FIG. 1, the absorption refrigerator 2 has a regenerator 4, which converts a vapor-phase or vapor-phase refrigerant along a line 6 into a condenser 8 (conventionally known). To supply
Concentrated liquid absorbent is supplied along line 10 to absorber 16 (known in the art) via one-way valve 12 and pump 14. From the condenser 8, the liquid refrigerant is supplied to an expansion device 18 (known in the art) in line 20 and then to an evaporator 22 (known in the art). Line 24 conveys the refrigerant vapor to absorber 16 where the refrigerant is dissolved in an absorbent to form a weak solution of the absorbent containing the refrigerant. The weak solution is conveyed to the regenerator 4 through the one-way valve 26 and the pump 30 in the line 28, and becomes a concentrated absorbent by boiling and separating the refrigerant in the regenerator 4.

The refrigerant is preferably water (H ₂ O), in which case the refrigerant vapor in line 6 is water vapor and the liquid absorbent is lithium bromide, but other refrigerants and absorbent combinations,
For example, ammonia as a refrigerant and water as an absorbent may be used.

Next, the regenerator 2 will be described in more detail with reference to FIGS. The regenerator 2 has a base frame 32, which has an outer casing 34 in the form of a parallel pipe (see dotted lines in FIGS. 5 to 7) and a substantially rectangular cross section having a flat upper surface 37. The side tank 36 is supported. A plurality of substantially vertical heat exchange tubes 38A, 38B rise from the flat upper surface 37 of the lower tank 36, the heat exchange tubes 38A having a cylindrical undecorated outer surface, and a heat exchange tube 38B.
Has a heat collecting structure constituted by the fins 40. Heat exchange tube 38A
, 38B penetrate the flat bottom surface 41 of the upper tank 42, which has a larger volume than the lower tank 36 and has a substantially rectangular cross-sectional shape.

Between the casing 34 and the structure including the tanks 36 and 42 and the heat exchange tubes 38A and 38B, an upper inner surface 44A (FIG. 2) and lower inner surfaces 44B (FIG. 2) and 2
Insulation is disposed having two opposing sides 44C, 44D (FIG. 5), the inner surfaces of which define a combined combustion chamber / flue 46, and the combined combustion chamber / flue 46 A part of 46 is also constituted by the tank upper surface 37 and the tank bottom surface 41. Insulation may include one or more layers of suitable materials, such as ceramic fiberboard,
It may consist of a ceramic blanket and / or rock wool. Almost all of the heat exchange tubes 38A and 38B are in the combustion chamber 46. Casing 3
At the upstream or front end 48 of the 4 is a gas burner, preferably a premixed package burner 50, which is an electric fan or impeller which propels combustion air premixed with fuel gas to a burner exit orifice. And the burner outlet orifice has a long side wall 54 (only one is shown in FIG. 2) in the casing 34.
And is disposed on a substantially rectangular frame 52 elongated in the vertical direction. If desired, the burner exit orifice may comprise a metal fiber burner. Casing 34
Outside, the downstream smoke passage in the rectangular tube 56 communicates with the combustion chamber 46. In view of the foregoing, the heat exchange tubes 38A, 38B have a cross flow relationship with respect to the flow direction X of the hot heated gas or combustion product from the burner 50 through the combustion chamber 46, and more particularly, with respect to the flow direction X It is understood that it is a right angle. In addition, heat exchange tube 3
8A and 38B are formed in a plurality of rows spaced apart from each other with respect to the flow direction X of the combustion product, and 11 rows in the illustrated example, and each row is formed with respect to the flow direction X of the combustion product. It can also be seen that there are at least two heat exchange tubes per row, and in the example shown, four heat exchange tubes per row. The finned heat exchange tubes 38B are disposed at or at the downstream end of the array of heat exchange tubes 38A, 38B relative to the flow direction X, and the plain or plain heat exchange tubes 38A are provided with fins forming the array. The heat exchange tube is disposed upstream with respect to the flow direction X. In the illustrated example, there are seven rows of plain heat exchange tubes 38A and four rows of finned heat exchange tubes 38B.

The two thermosiphon tubes 58A, 58B are arranged substantially vertically, extend from the lower tank 36 to the upper tank 42, and communicate with each of the lower tank 36 and the upper tank 42. As understood from FIGS. 5 to 7, the thermosiphon tube 5
8A, 58B are surrounded by thermal insulation which separates these thermosiphon tubes from the combustion chamber 46 and prevents heat transfer from the combustion chamber 46 to the thermosiphon tubes. Reference numerals 60 and 62 indicate the upstream ends of the lower tank 36 and the upper tank 42 with respect to the flow direction X of the combustion products in the combustion chamber 46, respectively.
Reference numeral 66 indicates the downstream ends of the lower tank 36 and the upper tank 42, respectively. The thermosiphon tube 58A is connected to the upstream end 6 of each of the upper tank 42 and the lower tank 36.
The tanks 42 and 36 communicate with the tanks adjacent to the tanks 2 and 60. The thermosiphon tube 58B is on the downstream side of the thermosiphon tube 58A with respect to the flow direction X, and communicates with the lower tank 36 almost at the middle of the lower tank 36 along the X direction.
The upper tank 42 communicates with a position closer to the upstream end 62 than the downstream end 66 of the upper tank 42. The number, size and inlet / outlet positions of the thermosiphon tubes may be adjusted. An inlet tube 68 for supplying a weak refrigerant / absorbent solution from line 28 (FIG. 1) to upper tank 42 leads to upper tank 42 opposite the inlet to thermosyphon tube 58A (FIGS. 4 and 4). 5). Add concentrated absorbent solution to line 10 (
An outlet tube 70 for conveying the refrigerant vapor or gas to the line 6 (FIG. 1) communicates from the downstream end 66 of the upper tank 42 with an outlet tube 70 for conveying the refrigerant vapor or gas to the line 6 (FIG. 1). I have.

The unit including the upper and lower tanks 42 and 36, the heat exchange tubes 38A and 38B, and the thermosiphon tubes 58A and 58B may be made of a metal such as carbon steel. However, because the absorbent used is corrosive, it is preferred that the unit is composed of a corrosion-resistant metal, for example cupronickel.

When a weak solution of the refrigerant / absorbent is continuously supplied to the upper tank 42 from the inlet 68 and the burner 50 is operated, the weak solution descends to the lower tank 36 through the thermosiphon tubes 58A and 58B. Then, it rises to the upper tank through the heat exchange tubes 38A and 38B. As the weak solution rises in the heat exchange tubes 38A, 38B, the refrigerant boils and separates into vapor, which exits through outlet 72. On the other hand, the remaining concentrated absorbent exits upper tank 42 through outlet 70. Heat exchange tube 38
A and 38B are almost half filled with steam that separates by boiling.

As described above, in the illustrated example, there are eleven rows of heat exchange tubes 38A and 38B, and these eleven rows of heat exchange tubes are identified as rows 1 to 11;
At the upstream end of the array of heat exchange tubes relative to flow direction X, row 11 is at its downstream end. The plain tubes 38A constitute rows 1 to 7, and the finned tubes 38B constitute rows 8 to 11. The products of combustion at the upstream end of the array of heat exchange tubes 38A, 38B tend to be hotter than the products of combustion at their downstream ends. To ensure more uniform extraction of heat along flow path X, tubes 38B are provided with fins that increase the ability to extract heat from relatively low temperature downstream combustion products.
The thermosiphon tube 58A first receives the weak solution introduced from the inlet and places the weak solution in the upstream heat exchange tube 38A, i.e., the tube rows 1, 2, 3 where it is exposed to the hottest combustion products. At the position of the lower tank 32 that is likely to rise through,
A weak solution is supplied.

A vapor permeable demister pad 74 made of metal mesh or fiber is disposed in front of the entrance to the outlet pipe 72, and in front of, or below, the demister pad 74, an impact is applied to the pad or A baffle plate 76 for preventing rising pulsation of the solution flowing into the outlet pipe 72 is provided.

In the upper tank 42, at its downstream end, in front of the entrance to the outlet pipe 70,
A calm or stagnation zone 78 is configured. The stagnation zone 78 is designed to reduce the opportunity for turbulent absorbent to enter the outlet 70 and increase the opportunity for only more concentrated absorbent to be supplied to the outlet. Thus, the stagnation band 78
Have two baffle plates 80 extending substantially vertically across the upper tank 42,
82. The tall baffle plate 80 separates the gap 84 from the floor of the upper tank 42 (see FIG. 10), and the other baffle plate 82 acting as a weir is somewhat taller than the gap 84. The more the absorbent is concentrated, the more the upper tank 42
Only the concentrated absorbent can flow through the gap 84 below the baffle plate 80, over the baffle plate 82, and to the outlet 70 as it tends to fall within.

Since the products of combustion passing through the flue 56 still retain recoverable heat, the flue 56 may be lined with thermal insulation, exposed to this flue gas and regenerator /
Another heat exchanger 86 may be provided that functions as an economizer / preheater. The heat exchanger 86 may be a tube in a serpentine configuration, or may be a plurality of serpentine components arranged side-by-side and connected in a continuous, continuous flow of liquid. Has a cross-flow relationship with the flow direction of the flue gas. The inlet to the heat exchanger 86 is designated by reference numeral 86A and the outlet is designated by reference numeral 86B.

Preferably, another heat exchanger 86 is used to preheat the weak refrigerant / absorbent solution supplied by the pump 30. For this purpose, the part of the line 28 between the position a and the position b shown in FIG.
Extended by 8A. Further, the other portion of the line 28B is communicated from the outlet 86B to the inlet tube 68.

When the apparatus uses an additional heat exchanger 86, a H ₂ O / LiBr solution, and a 350 kW burner that burns a fuel gas, such as natural gas, with about 20% excess combustion air,
Obtain the following operating conditions: The boiling point of the solution is about 160 ° C., the concentrated solution supplied to the outlet 70 is about 64% LiBr salt, and the speed of the mixture flowing from the heat exchange tubes 38A, 38B to the upper tank 42 is about 1.5 m / Seconds. The temperature of the flue gas in the flue 56 is about 210 ° C. FIG. 12 shows the change in heat exchange tube wall temperature for tubes in row 1 to tubes in row 11 and how the cumulative efficiency of the generator changes from one row to the next along the array of heat exchange tubes. It increases gradually (and relatively uniformly). The pressure in the upper tank 42 is 0.5 bar (
(Gauge pressure) or a pressure substantially similar to this.

In the drawings, reference numeral 88 indicates a fitting for attaching a pressure relief valve to the upper tank 42, and reference numeral 90 indicates an access tube for receiving a liquid level sensor inserted into the stagnation zone 78 of the upper tank. , Reference numeral 92 indicates a normally closed drain passage. Main interior and stagnation zone 7 of upper tank 42
The viewing windows allowing the visualization of 8 are indicated by reference numerals 94 and 96, respectively. Temperature sensors may be provided in the upper and lower tanks 42, 36.

In the above description, the weak refrigerant / absorbent solution is supplied from the inlet pipe 68 to the upper tank 42.
Alternatively, the inlet pipe 68 may be closed or removed to allow the weak solution from the line 28 or the lines 28, 28A, 28B to face the lower opening of the thermosiphon tube 58A. Then, it may be supplied to the lower tank from an inlet pipe 98 communicating with the lower tank 36.

Although a package burner with a rated output of 350 kW has been mentioned, a package burner with a different rated output, for example, several kW to several MW may be used.

In the gas supply system for the package burner 50 of FIG. 11, the burner has a fan or impeller 100 driven by an electric motor 102 to draw combustion air along the duct 104 and within the duct 104. The combustion air is premixed with the fuel gas from the gas supply line 106 prior to supplying the combustion air to the burner outlet orifice. The electric control device (not shown) includes the motor control device 1
08, a pressure switch 110 for monitoring the outlet pressure of the air / fuel gas mixture from the impeller 100, a pressure switch 112 for monitoring the pressure of the supplied fuel gas, solenoid control valves 114, 116, and Air / fuel ratio control device 1 configured to respond to a signal representative of air pressure near orifice plate 120
18. The manual valve 121 must be opened before any fuel gas is supplied. When the pressure of the supply gas, which is monitored by the pressure switch 112, falls outside a predetermined range, the electric control device activates one or the other of the solenoid valves 114, 116 so as to cut off the gas supply to the burner. Switch 11
When the pressure monitored by 0 falls outside the predetermined range, the electronic control unit activates the valve 1
One or the other of 14, 14 is operated to shut off, and the motor 102 is also stopped. The electric control unit responds to the demanded burn rate in the burner by controlling the motor control unit 10.
8 is operated to change the speed of the impeller 100 to provide the desired amount of combustion air. As a modified example, the motor control device 108 is omitted and the impeller 100
At a constant speed, and the amount of supplied combustion air may be changed by operating a throttle valve 122 in a duct 104 driven by a throttle motor 126 in accordance with a signal input by an electric control device.

Instead of using the package burner 50, some other means of generating hot gas to heat the heat exchange tubes 38A, 38B, such as hot exhaust gas from a gas turbine, may be used.

By selecting a thermosiphon tube as the refrigerant solution transfer means and / or
Alternatively, by locating the thermosiphon tube outside the hot gas flow path, there is no, at least little, or reduced heat transfer from the combustion gases to the thermosiphon tube, resulting in good thermosiphon action. Can promote. The weak solution flows into the upper chamber and the lower part of the solution can be used.

Further, by disposing the thermosiphon tube outside the hot gas flow path,
The degree of freedom in selecting the size, shape and position of the thermosiphon tube can be increased.
By careful selection of appropriate design features, a weak solution can be selected and the flow rate of the weak solution can be controlled. Placing the thermosiphon tube outside the hot gas flow path facilitates the placement of the thermosiphon tube in the generator, allows the thermosiphon tube to be used as a flow level meter, and reduces the total weight of the member. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of an absorption refrigerator according to the present invention, showing a regenerator in a perspective view.

FIG. 2 is a side view of the regenerator of FIG. 1 omitting a casing horizontal panel and a heat insulating material.

FIG. 3 is a plan view of the regenerator of FIG.

FIG. 4 is a partially broken side view showing upper and lower tanks, a heat exchange tube, and a thermosiphon passage of the regenerator of FIG. 2;

FIG. 5 is a drawing viewed in the direction of arrow V in FIG. 4;

6 is a plan view of FIG.

FIG. 7 is a sectional view taken along line VII-VII in FIG. 4;

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 4;

9 is a drawing of the upper surface of the refrigerator component of FIG. 4 as viewed from the direction of arrow IX in FIG. 4;

FIG. 10 is an enlarged view of a region X in FIG. 4;

FIG. 11 is a schematic diagram of a fuel gas supply / control train of a fuel gas burner used for heating the regenerator of FIG. 1;

FIG. 12 is a graph showing the efficiency of the generator shown in FIGS. 1 to 11 and the temperature of the heat exchange tube wall, provided with 11 rows of heat exchange tubes and heated by a fuel gas burner having a rated output of 350 kW.

[Procedure amendment]

[Submission date] December 14, 2001 (2001.12.14)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Contents of correction]

[Claims]

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Clark David Anthony UK Leicestershire EL 67 2B Couleville Hugglescourt Mill Dam 4 (72) Inventor Sadler Jeffrey David UK Leicestershire EL 10 2 Easy Hinckley Barbey Woodstock Close 34 (72) Inventor Rua Ike Ben United Kingdom Leicestershire EL12

Claims (42)

[Claims] 1. An absorption refrigerator in which a refrigerant is dissolved in a liquid absorbent so as to form a refrigerant solution dissolved in the absorbent, wherein the refrigerant solution is boiled and separated from the absorbent. A generator for heating, the generator comprising an upper tank and a lower tank containing the refrigerant solution during use, and means for transferring the refrigerant solution upward from the lower tank to the upper tank; Means for transferring the refrigerant solution downward from the upper tank to the lower tank, and means for supplying a high-temperature heating gas along the high-temperature gas flow path, and means for transferring the refrigerant solution upwards The means for transferring the refrigerant solution downward is disposed entirely or almost entirely outside the high-temperature gas flow path, such that the refrigerant solution is heated by the high-temperature heating gas. Is characterized by being Absorption refrigerator. 2. The means for transferring the refrigerant solution upward from the lower tank to the upper tank comprises a heat exchange tube, the heat exchange tube comprising a hot gas and a solution in the heat exchange tube. An absorption refrigerator disposed in the hot gas flow path for heat exchange between the above. 3. The absorption refrigerator according to claim 2, wherein one or more of the heat exchange tubes is disposed upstream with respect to one or more of the other heat exchange tubes. 4. The means for transferring the refrigerant solution downward from the upper tank to the lower tank includes at least one thermosiphon tube extending from one tank to the other tank and communicating with each tank. Having a refrigerant solution flowing from the upper tank through the thermosiphon tube to the lower tank,
The absorption refrigerator according to any one of claims 1 to 3. 5. The method of claim 1, wherein a fluid flows into the means for transporting the refrigerant solution upward along a direction extending transversely to a flow direction of the hot gas along the hot gas flow path. Item 2. The absorption refrigerator according to item 1. 6. The apparatus according to claim 1, wherein each of the means for transferring the refrigerant solution upwards extends substantially perpendicularly to a flow direction of the hot gas along the hot gas flow path.
The absorption refrigerator according to any one of the above. 7. The heat exchange tube according to claim 1, wherein the first heat exchange tube is arranged upstream of a second heat exchange tube having an external heat collection configuration with respect to a direction of the hot gas flow along the hot gas flow path. The absorption refrigerator according to any one of claims 1 to 6. 8. The absorption chiller according to claim 7, wherein the external heat collecting structure is a fin. 9. The absorption refrigerator according to claim 7, wherein the first heat exchange tube has an undecorated outer surface. 10. The heat exchange tubes are arranged in an array comprising a plurality of rows extending across the hot gas flow path, each row comprising a plurality of heat exchange tubes spaced from one another, The plurality of rows are arranged one by one along the hot gas flow path, and the heat exchange tubes in one row are alternately arranged with respect to the heat exchange tubes in an adjacent row. 10. The absorption refrigerator according to any one of 9 above. 11. The absorption refrigerator according to claim 1, wherein the means for transferring the refrigerant solution downward is separated from the high-temperature gas flow path by a heat partitioning means. 12. The absorption refrigerator according to claim 1, wherein the means for transferring the refrigerant solution downward has a heat insulating material outside the means. 13. The absorption refrigerator according to claim 1, wherein the wall of the tank receives heat from a hot gas in the hot gas flow path. 14. The absorption refrigerator according to claim 1, wherein a wall of the tank constitutes a wall of the high-temperature gas flow path. 15. The absorption refrigerator according to claim 1, wherein each of the tanks has an upstream end and a downstream end in a flow direction of the hot gas along the hot gas flow path. 16. The absorption refrigerator according to claim 15, wherein the or other thermosiphon tube communicates with the lower tank adjacent an upstream end of the lower tank. 17. The absorption refrigerator according to claim 16, wherein a plurality of heat exchange tubes communicate with the lower tank adjacent an upstream end of the lower tank. 18. The method according to claim 15, wherein the or another thermosiphon tube communicates with the upper tank adjacent an upstream end of the upper tank.
The absorption refrigerator according to the item. 19. The absorption refrigerator according to claim 18, wherein a plurality of heat exchange tubes communicate with the upper tank adjacent an upstream end of the upper tank. 20. At least a first thermosiphon tube and a second thermosiphon tube, wherein the first thermosiphon tube communicates with each tank adjacent to an upstream end of each of the tanks, The siphon tube communicates with each tank downstream of the first thermosiphon tube, but not further from the upstream end of each tank than approximately halfway between the upstream and downstream ends of each tank. 1
20. The absorption refrigerator according to any one of 6 to 19. 21. The absorption refrigerator according to claim 1, wherein an inlet for supplying a refrigerant solution communicates with the upper tank. 22. The absorption refrigerator according to claim 1, wherein an inlet for supplying a refrigerant solution communicates with the lower tank. 23. The absorption refrigerator according to claim 15, wherein the inlet communicates with the upper tank adjacent to an upstream end of the upper tank. 24. The absorption refrigerator according to claim 15, wherein the inlet communicates with the lower tank adjacent to an upstream end of the lower tank. 25. The absorbent according to claim 1, wherein an outlet for the absorbent communicates with the upper tank.
23. The absorption refrigerator according to any one of claims 14, 21 and 22. 26. The absorption refrigerator according to claim 15, wherein the absorbent outlet communicates with a downstream end of the upper tank. 27. An absorption refrigerator according to claim 25 or 26, wherein a stagnation zone is provided in the upper tank adjacent to the outlet for the absorbent. 28. The absorbent of claim 27, wherein the stagnation zone has a baffle configuration, wherein at least one baffle is spaced from the floor of the upper tank for the flow of absorbent underneath. refrigerator. 29. The absorption refrigerator according to claim 1, wherein an outlet for the refrigerant vapor communicates with the upper tank. 30. The absorption refrigerator according to claim 29, further comprising demister means for passage of the refrigerant vapor to the refrigerant vapor outlet. 31. An absorption refrigerator according to claim 29 or 30, wherein a baffle means is arranged in an upper portion of the upper tank and is in front of the outlet for the refrigerant vapor. 32. Additional heat exchange means, said additional heat exchange means downstream of said heat exchange tube and said high temperature heat transfer for transferring heat from a hot gas to said further heat exchange means. 25. Any of the claims 21 to 24, arranged in a gas flow path, wherein at least a part of the refrigerant solution undergoes initial heating for the further heat exchange means before being supplied to the inlet. The absorption refrigerator according to the item. 33. The absorption refrigerator according to claim 1, wherein the high-temperature gas comprises a combustion product. 34. The absorption refrigerator of claim 33, wherein the products of combustion are created by burning a gas. 35. The absorption refrigerator according to claim 34, wherein the combustion products are produced by burning fuel gas with a fuel gas burner. 36. The absorption refrigerator according to claim 35, wherein the gas burner is a premix burner. 37. The absorption refrigerator according to claim 36, wherein the gas burner has a driven fan for supplying combustion air. 38. An inlet for supplying a coolant solution leading to the tank, and the or other thermosiphon tube leading to the tank adjacent to or opposite to the inlet. Item 15. The absorption refrigerator according to any one of Items 4 to 14. 39. An inlet for supplying a refrigerant solution weakened by the refrigerant dissolved in the absorbent communicates with the upper tank, and wherein the inlet receives the weak solution discharged or the other. 15. The thermosiphon tube of claim 4, wherein said thermosiphon tube communicates with said upper tank adjacent to or substantially opposite to said inlet.
The absorption refrigerator according to any one of the above. 40. The absorption refrigerator according to claim 4, wherein an inlet for supplying a refrigerant solution communicates with at least one thermosiphon tube. 41. The refrigerant according to claim 1, wherein the refrigerant is water and the absorbent is lithium bromide.
41. The absorption refrigerator according to any one of items 40 to 40. 42. The refrigerant is dissolved in the liquid absorbent to form a refrigerant solution dissolved in the absorbent, and further comprising a generator substantially as described with reference to the accompanying drawings. And absorption refrigerator.