WO2018072314A1 - Absorption refrigeration unit and absorption refrigeration matrix - Google Patents

Abstract

Provided are an absorption refrigeration unit (100, 501, 502, 503, 504, 505, 506) and an absorption refrigeration matrix (500). A regenerator (201), an absorber (203), a condenser (202), and an evaporator (204) of the absorption refrigeration unit (100, 501, 502, 503, 504, 505, 506) are all shell and tube heat exchangers (300), comprising a shell side that consists of shell and tube heat exchanger casings (322), and a tube side that consists of heat exchange tubes (310) in the shell and tube heat exchanger casings (322); the heat exchange tubes (310) are made of plastic. A solution heat exchanger (135) of the absorption refrigeration unit (100, 501, 502, 503, 504, 505, 506) is a plate heat exchanger, comprising a plate heat exchanger casing (424) and a heat exchange wallboard (420); the heat exchange wallboard (420) is fixed in the plate heat exchanger casing (424) and is made of plastic. The total weight of the absorption refrigeration unit is reduced, and the absorption refrigeration unit is able to prevent generation of non-condensable gas and improve the sealing performance.

Description

Absorption refrigeration unit and absorption refrigeration matrix Technical field

The invention relates to the technical field of refrigeration equipment, in particular to an absorption refrigerator.

Background technique

An absorption refrigerating machine which uses a binary solution as a working medium, wherein a low-boiling component is used as a refrigerant, that is, it is cooled by evaporation thereof; a high-boiling component is used as an absorbent, that is, an absorption effect of the refrigerant vapor is utilized. Complete the work cycle. For example, a lithium bromide absorption refrigerating machine uses pure water as a refrigerant, that is, it relies on pure water to evaporate and absorb heat in a high vacuum environment to realize a cooling function. The refrigerant vapor after the endothermic evaporation is absorbed, transported, heated and regenerated, condensed by the lithium bromide solution, and returned to the liquid state again, and then again absorbs heat and evaporates, and the source continuously performs the refrigeration cycle.

Due to the physical and chemical properties of pure water, the evaporation temperature of the evaporator is generally set at about 5 ° C, and the saturation pressure is about 872 Pa. This high vacuum environment requires high air tightness of the refrigerator. Conventionally, a heat exchanger inside an absorption chiller uses a copper tube having a diameter of 16 mm or more as an array, and a copper plate is used as a heat exchange wall plate, thereby facing a complicated sealing problem with other components, and production efficiency is restricted. At the same time, this also results in a large overall weight of the absorption chiller, making it difficult to achieve weight reduction of the absorption chiller. The metal is easily corroded by the solution and generates a non-condensable gas such as hydrogen to lower the working efficiency of the absorption refrigerating machine.

Due to the use of non-ferrous materials and mechanical processing methods, conventional absorption chillers are generally bulky, have poor corrosion resistance, and require professional maintenance, and generally cannot be used in homes and commercial applications where power is required.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide an absorption refrigeration unit in which a heat exchange tube and a heat exchange wall plate are made of plastic, so that the absorption refrigeration unit can be made under the premise of satisfying heat exchange performance. Lightweight and miniaturized. At the same time, the heat exchange tube and the heat exchange wall plate made of plastic are easy to seal and improve the production efficiency. The plastic has strong anti-corrosion performance, can avoid non-condensable gas, and increases the working efficiency of the absorption refrigerating machine. Such an absorption refrigeration unit is suitable for both high-power applications and suitable Used in homes and commercial applications where less power is required. Plastics include general purpose plastics, engineering plastics and reinforced engineering plastics.

A second object of the present invention is to provide an absorption refrigeration matrix comprising a plurality of the above-described absorption refrigeration units.

Embodiments of the present invention are implemented by the following technical solutions:

The absorption refrigeration unit and the absorption refrigeration unit are an absorption refrigerator.

The regenerator, absorber, condenser and evaporator of the absorption refrigeration unit are shell-and-tube heat exchangers, including a shell side consisting of a shell-and-tube heat exchanger housing, and a shell-and-tube heat exchanger housing The tube path formed by the heat exchange tubes; the heat exchange tubes are made of plastic.

The solution heat exchanger of the absorption refrigeration unit is a plate heat exchanger, the plate heat exchanger has a plate heat exchanger casing and a heat exchange wall plate; the heat exchange wall plate is fixed in the plate heat exchanger casing, and the heat exchange wall plate is Made of plastic.

The inventors have found through research that in the absorption refrigerating machine, in order to improve the heat transfer performance, the heat exchange tubes in the condenser, the evaporator, the absorber and the regenerator are made of a metal material having a relatively high heat transfer coefficient. The heat exchange wall of the solution heat exchanger is also made of a metal material. However, the density of the metal material is large, resulting in a large overall weight of the absorption refrigerator. In addition, the metal heat exchange tube and the heat exchange wall plate also have the problems that the solution is corroded to generate non-condensable gas, which affects the working efficiency of the absorption refrigerating machine, and has high sealing process requirements and high sealing cost. Plastics have a lower density than metal materials. The weight of plastic in the same volume is much lower than that of metallic materials (such as brass). To this end, the inventors made the heat exchange tubes and the heat exchange wall plates in the absorption chiller made of plastic. The absorption refrigeration unit provided by the embodiment of the invention can greatly reduce the weight of the whole machine. The heat exchange tubes and heat exchange panels made of plastic are easy to seal. The plastic has stronger corrosion resistance, can avoid corrosion by solution and generate non-condensable gas, and increases the working efficiency of the absorption refrigerator. Such an absorption refrigeration unit is suitable for use in homes and commercial applications where power is required.

In one embodiment of the invention, the tube wall thickness of the heat exchange tubes is from 0.1 to 0.5 mm.

In one embodiment of the invention, the tube wall thickness of the heat exchange tubes is 0.15 mm.

In one embodiment of the present invention, a plurality of rows of heat exchange tubes are arranged in an upper and lower layer; a plurality of support strips are disposed between the adjacent two rows of heat exchange tubes; and the support strips are used to support the adjacent two rows of heat exchange tubes.

In one embodiment of the invention, the support strip is made of plastic.

In one embodiment of the invention, the support strips and heat exchange tubes are made of the same plastic.

In an embodiment of the invention, the plurality of rows of heat exchange tubes are arranged in an upper and lower layer; the outer diameter of the heat exchange tubes is from 3 mm to 5 mm. The center distance of adjacent heat exchange tubes located in the same row is 4 mm to 6 mm. The center distance between the upper and lower adjacent heat exchange tubes is 5 mm to 8 mm.

In one embodiment of the invention, the heat exchange tube has an outer diameter of 3 mm. Adjacent heat exchange tubes located in the same row have a center-to-center distance of 4 mm. The center distance between the upper and lower adjacent heat exchange tubes is 7 mm.

In one embodiment of the invention, the shell and tube heat exchanger housing is made of plastic.

In one embodiment of the invention, the shell and tube heat exchanger housing and the heat exchange tubes are made of the same plastic.

In one embodiment of the invention, the heat exchange wall panel has a thickness of from 0.1 mm to 0.5 mm.

In one embodiment of the invention, the heat exchange wall panel has a thickness of 0.15 mm.

In an embodiment of the invention, the heat exchange wall plate is provided with textured ridges for supporting the heat exchange wall and turbulent flow of the fluid flowing through the ridges to increase the heat transfer coefficient.

In one embodiment of the invention, the ribs are made of plastic.

In one embodiment of the invention, the ribs and the heat exchange wall are made of the same plastic.

In one embodiment of the invention, the heat exchange panels are arranged in multiple layers. The wall spacing of the adjacent two layers of the heat exchange wall plate is 0.5 mm to 3 mm.

In one embodiment of the invention, the wall spacing of the adjacent two layers of heat exchange panels is 1 mm.

In one embodiment of the invention, the plate heat exchanger housing is made of plastic.

In one embodiment of the invention, the plate heat exchanger housing and the heat exchange wall are made of the same plastic.

In an embodiment of the invention, the fuselage housing of the absorption refrigeration unit is made of plastic.

In one embodiment of the invention, the absorption refrigeration unit has a plurality of water flow interfaces for introducing and discharging cold water, hot water and cooling water; the water flow interface is made of plastic.

In one embodiment of the invention, the components of the absorption refrigeration unit are all made of plastic.

In an embodiment of the invention, the absorption refrigeration unit is provided with at least two groups of water flow interface groups, each group of water flow interface groups including at least a water flow interface as an inlet and an outlet of the hot water, and a water flow interface as an inlet and an outlet of the cold water. , as a water flow interface for the inlet and outlet of the cooling water. Adjacent absorption refrigeration units can be interconnected by a water flow interface such that any number of absorption refrigeration units can be plugged into each other through the water flow interface to form an absorption refrigeration matrix.

In one embodiment of the invention, the absorption refrigeration unit is provided with at least two combined faces; each set of water flow interface groups is distributed on the combined face.

In an embodiment of the invention, the body casing of the absorption refrigeration unit is a rectangular parallelepiped, and the combined surface is six surfaces of the fuselage casing. A set of water flow interface groups is provided on each combination surface. Adjacent absorption refrigeration units can be interconnected by a water flow interface such that any number of absorption refrigeration units can be plugged into each other through a water flow interface to form a matrix type absorption refrigeration matrix.

In one embodiment of the present invention, the combined surface of the absorption refrigeration unit is used to closely fit the combined surfaces of adjacent absorption refrigeration units to form a matrix type absorption refrigeration matrix.

In one embodiment of the invention, the water flow interfaces on at least one of the opposing sets of faces are mirror symmetrical to one another.

In an embodiment of the invention, the body casing of the absorption refrigeration unit is provided with a water flow pipe system, and the water flow pipe system connects the same function water flow interfaces in different water flow interface groups; the water flow pipe system is also connected with the pipe The tube-connected connection of the shell-type heat exchanger enables the absorption refrigeration unit to simultaneously or separately introduce hot water, cold water and cooling water through any one of the water flow interface groups.

In one embodiment of the invention, the water flow conduit system forms a unitary structure with the fuselage housing.

In an embodiment of the invention, the water flow pipeline system comprises a hot water inlet pipe, a hot water outlet pipe, a cold water inlet pipe, a cold water outlet pipe, a cooling water inlet pipe, and a cooling water outlet pipe.

The hot water inlet pipe connects the hot water inlet to the inlet of the tube of the regenerator.

The hot water outlet pipe connects the hot water outlet and the outlet of the regenerator tube.

The cold water inlet pipe connects the cold water inlet to the inlet of the evaporator tube.

The cold water outlet pipe connects the cold water outlet and the outlet of the evaporator tube.

The cooling water inlet pipe connects the cooling water inlet to the inlet of the tube of the absorber and condenser.

The cooling water outlet pipe connects the cooling water outlet and the outlet of the tube of the absorber and condenser.

In an embodiment of the invention, the regenerator and the condenser are located in an upper portion of the body casing of the absorption refrigeration unit, wherein

The regenerator is used to heat and evaporate the refrigerant water absorbed in the dilute solution to obtain the refrigerant vapor; the heat absorbed by the evaporation process is provided by the hot water of the regenerator tube.

The condenser is used to cool and condense the refrigerant vapor obtained in the regenerator into refrigerant water, and the refrigerant water passes through the section. After the flow, it flows to the shell side of the evaporator.

In an embodiment of the invention, the evaporator and the absorber are located in a lower portion of the body casing of the absorption refrigeration unit, wherein

The evaporator is used for evaporating heat of the shell-side refrigerant water to cool the cold water of the tube;

The absorber is used to absorb the refrigerant vapor generated by the shell side of the evaporator into the concentrated solution, and the heat released during the absorption is carried away by the cooling water of the tube.

In one embodiment of the invention, the absorption refrigeration unit further includes a solution tank; the solution tank is for recovering the dilute solution produced in the absorber and providing the regenerator with the desired dilute solution.

In one embodiment of the invention, the solution tank is made of plastic.

An absorption refrigeration matrix comprising any of the above-described absorption refrigeration units.

The technical solution of the present invention has at least the following advantages and beneficial effects:

The absorption refrigeration unit provided by the embodiment of the invention has a heat exchange tube and a heat exchange wall plate made of plastic. The weight of the whole machine can be greatly reduced. The heat exchange tubes and heat exchange panels made of plastic are easy to seal. The plastic has stronger corrosion resistance, can avoid corrosion by solution and generate non-condensable gas, and increases the working efficiency of the absorption refrigerator. Such an absorption refrigeration unit is suitable for use in homes and commercial applications where power is required.

Further, the absorption refrigeration matrix provided by the embodiment of the present invention has the above-mentioned absorption refrigeration unit, and therefore has the advantages of low weight, easy sealing, stronger corrosion resistance, and high work efficiency.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following drawings for the embodiments need to be briefly introduced. It is understood that the following drawings are merely illustrative of certain embodiments of the invention and are not intended to Other drawings can be obtained from those skilled in the art without departing from the drawings.

1 is a schematic perspective view showing the structure of an absorption refrigeration unit according to an embodiment of the present invention;

2 is a schematic exploded view showing the assembly of the absorption refrigeration unit in the embodiment of the present invention;

3A is a schematic perspective structural view of a condenser and a side regenerator in an embodiment of the present invention;

3B is a schematic cross-sectional structural view of a condenser and a side regenerator in an embodiment of the present invention;

4A is a schematic perspective view showing a three-dimensional installation structure of a solution heat exchanger according to an embodiment of the present invention;

4B is a schematic structural view of a bare heat exchange wall plate after a part of components are removed by a solution heat exchanger according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of direct splicing of six absorption refrigeration units to form an absorption refrigeration matrix in an embodiment of the present invention. FIG.

The name of the component corresponding to the reference number is as follows:

Absorption refrigeration unit 100; upper combined surface 110; lower combined surface 130; left combined surface 120; right combined surface 140; hot water inlets 111, 121; hot water outlets 112, 122; cold water inlets 113, 123; cold water outlets 114, 124; cooling water inlets 115, 125; cooling water outlets 116, 126; solution heat exchanger 135; regenerator 201; condenser 202; absorber 203; evaporator 204; hot water inlet pipes 211, 221; Pipes 212, 222; cold water inlet pipes 213, 223; cold water outlet pipes 214, 224; cooling water inlet pipes 215, 225; cooling water outlet pipes 216, 226; solution pump 231; solution tank 232; 300; support strip 301; heat exchange tube 310; solution distributor 321; shell-and-tube heat exchanger housing 322; drain hole 340; dilute solution inlet 401; concentrated solution outlet 402; concentrated solution to the absorber shell Channel 404; concentrated solution inlet 406; dilute solution outlet 408; dilute solution to regenerator channel 409; dilute solution channel 412; concentrated solution channel 414; heat exchange wall 420; rib 422; plate heat exchanger housing 424; Absorption refrigeration matrix 500; absorption refrigeration unit 501, 502, 503 504,505,506; hot water inlet 511; 512 hot water outlet; cold water inlet 513; cold water outlet 514; 515 cooling water inlet; and a cooling water outlet 516.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are part of the embodiments of the invention, and not all of the embodiments.

Therefore, the following detailed description of the embodiments of the invention is not intended to All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that the features and technical solutions in the embodiments and the embodiments of the present invention may be combined with each other without conflict.

It should be noted that similar reference numerals and letters indicate similar items in the following figures, and therefore, once an item is defined in a drawing, it is not necessary to further define and explain it in the subsequent drawings.

In the description of the present invention, it is to be noted that the orientation or positional relationship of the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or The orientation or positional relationship that is conventionally placed when the product is used, or the orientation or positional relationship that is conventionally understood by those skilled in the art, is merely for the convenience of describing the present invention and simplifying the description, and does not indicate or imply the indicated device. Or the components must have a particular orientation, are constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.

Example:

The heat exchanger inside the conventional absorption chiller uses a copper tube having a diameter of 16 mm or more as an array, and thus faces complicated sealing problems with other components, and production efficiency is restricted. At the same time, this also results in a large overall weight of the absorption chiller, making it difficult to achieve weight reduction of the absorption chiller. The metal is easily corroded by the solution and generates a non-condensable gas such as hydrogen to lower the working efficiency of the absorption refrigerating machine.

Due to the use of non-ferrous materials and mechanical processing methods, conventional absorption chillers are generally bulky, have poor corrosion resistance, and require professional maintenance. Generally, they cannot be used in homes and commercial applications where power is required.

To this end, the present embodiment provides an absorption refrigeration unit which is an absorption refrigerating machine whose heat exchange tubes and heat exchange wall plates are made of plastic. The heat exchange tube is a thin-walled pipe member, and the heat exchange wall plate is a thin-walled plate member, so that the absorption refrigeration unit can realize weight reduction and miniaturization under the premise of satisfying heat exchange performance. At the same time, the heat exchange tube and the heat exchange wall plate made of plastic are easy to seal, and can be integrated with other plastic parts by a precision injection molding process, thereby improving production efficiency. The plastic has strong corrosion resistance, can avoid non-condensable gas, increases the working efficiency of the absorption refrigeration unit, and reduces the maintenance frequency. Such an absorption refrigeration unit is suitable for use in a home and a commercial where power is required due to its weight reduction, miniaturization, and maintenance frequency.

The absorption refrigeration unit provided in this embodiment is also capable of forming a large absorption refrigeration matrix through a water flow interface group, which is highly expandable. Furthermore, it is only necessary to produce a standardized absorption refrigeration unit, and a plurality of absorption refrigeration units can be combined as needed during use, which greatly improves production efficiency and reduces manufacturing. Cost and production cycle.

In the present embodiment, the term "plastic" refers to engineering-plastics, such as polycarbonate (PC), polyamide (polyamide, PA), polyacetal (Polyoxy Methylene, POM), poly Polyphenylene Oxide (PPO), polyester (PET, PBT), polyphenylene sulfide (PPS), polyaryl ester, and the like.

In this embodiment, an absorption refrigeration unit using a lithium bromide solution and a refrigerant water as a working medium will be described as an example.

1 is a schematic perspective view of an absorption refrigeration unit 100 according to an embodiment of the present invention. The absorption refrigeration unit 100 is an absorption refrigerating machine having a rectangular parallelepiped shape. As an embodiment, the refrigeration power of the absorption refrigeration unit 100 is 3RT (about 11 kW), and the main body volume is only 840×400×200 (mm3), less than 0.1 cubic meter, and is processed by a precision injection molding process. The inside is provided with heat exchange components such as a regenerator, an evaporator, an absorber, and a condenser.

The absorption refrigeration unit 100 uses lithium bromide solution + refrigerant water as a working medium, and relies on refrigerant water to evaporate and absorb heat in a high vacuum environment to achieve refrigeration. The refrigerant water absorbs heat and evaporates into a refrigerant vapor. The refrigerant vapor no longer has a phase change endothermic capacity. Therefore, it is absorbed by the lithium bromide solution and then regenerated by heating with the lithium bromide solution to generate a refrigerant vapor. The refrigerant vapor is condensed and returned to the liquid refrigerant water to be again absorbed by heat. The refrigerant water absorbs heat and absorbs - absorption - regeneration - condensation - and then absorbs heat and evaporates, so that the source continuously performs the refrigeration cycle. The cold water, hot water and cooling water exchange heat between the evaporator, the regenerator, the absorber and the various components of the condenser to complete the refrigeration process. The absorption refrigeration unit 100 obtains energy from the outside through hot water, cooling water, and cold water pipes, respectively, and releases heat to the outside and supplies cold to the outside.

The absorption refrigeration unit 100 shown in Fig. 1 also has a water flow piping system, a solution heat exchange and a circulation system to constitute an independent and complete refrigerator. When installed separately, its cooling power is called unit power. At the same time, the plurality of absorption refrigeration units 100 have the capability of forming a large absorption refrigeration matrix by combination, so that the total power becomes the sum of the powers of the plurality of absorption refrigeration units 100.

To accommodate this combination, the present embodiment provides a set of water flow interface groups on the four combined faces of the absorption refrigeration unit 100: the upper combined face 110, the left combined face 120, the lower combined face 130, and the right combined face 140, respectively. Each group of water flow interface groups includes a hot water inlet, a hot water outlet, a cold water inlet, a cold water outlet, a cooling water outlet, and a cooling water inlet. Take the upper combined surface 110 and the right combined surface 140 that can be seen in Figure 1 as an example: The upper combined surface 110 is respectively provided with a hot water inlet 111, a hot water outlet 112, a cold water inlet 113, a cold water outlet 114, a cooling water inlet 115 and a cooling water outlet 116; the right side surface 140 is respectively provided with a hot water inlet 121 and hot water. The outlet 122, the cold water inlet 123, the cold water outlet 124, the cooling water inlet 125, and the cooling water outlet 126. In fact, the lower combined surface 130 opposite the upper combined surface 110 is provided with six identical water flow interfaces that are mirror symmetrical with the upper combined surface 110, and the left combined surface 120 (back) opposite the right combined surface is provided with The right combination face 140 is six identical water flow interfaces that are mirror symmetrical. The symmetrical design of the upper and lower sides makes the corresponding water flow interfaces align and connect together when the two absorption refrigeration units 100 are combined up and down or left and right.

In fact, at least two of the six faces of the rectangular parallelepiped absorption refrigeration unit 100 may be arranged as a combined face, each of which is provided with a set of water flow interface groups for use with adjacent absorption refrigeration units (or external The energy medium is connected. Each group of water flow interface groups includes six water flow interfaces. In actual use, according to the actual situation, it is also possible to use four water flow interfaces or other number of water flow interfaces as one water flow interface group on one combined surface.

The rectangular parallelepiped absorption refrigeration unit enables adjacent absorption refrigeration units to closely fit each other through the combined faces to form an absorption refrigeration matrix, thereby obtaining a more compact structure. It can be understood that in other embodiments, the absorption refrigeration unit may not adopt a rectangular parallelepiped structure.

2 is a schematic exploded view of the assembly of the absorption refrigeration unit 100 in the embodiment of the present invention.

In FIG. 2, the regenerator 201 and the condenser 202 are located at an upper portion in the body casing of the absorption refrigeration unit 100. The regenerator 201 is for heating and evaporating the refrigerant water absorbed in the dilute solution to obtain the refrigerant vapor, and the heat absorbed by the evaporation process is supplied by the hot water of the tube of the regenerator 201. The condenser 202 is used to cool and condense the refrigerant vapor obtained in the regenerator 201 into refrigerant water, and the refrigerant water flows to the shell side of the evaporator 204 after throttling. The evaporator 204 and the absorber 203 are located at a lower portion in the body casing of the absorption refrigeration unit 100. The evaporator 204 is used to cool the cold water of the tube by the endothermic heat of evaporation of the shell-side refrigerant water. The absorber 203 is used to absorb the refrigerant vapor generated by the shell side of the evaporator 204 into the concentrated solution, and the heat released during the absorption is carried away by the cooling water of the tube.

In FIG. 2, the upper combined surface 110 of the absorption refrigeration unit is provided with a plurality of water flow pipes formed by the mutual cooperation of the housing wall plates; respectively, the hot water inlet pipe 211, the hot water outlet pipe 212, and the cold water inlet pipe. 213, a cold water outlet pipe 214, a cooling water inlet pipe 215, and a cooling water outlet pipe 216, and It is not connected to the hot water inlet 111, the hot water outlet 112, the cold water inlet 113, the cold water outlet 114, the cooling water inlet 115, and the cooling water outlet 116.

Similarly, in FIG. 2, the right combination surface 140 of the absorption refrigeration unit is provided with a plurality of water flow pipes formed by the mutual matching of the wall plates of the fuselage casing; respectively, the hot water inlet pipe 221 and the hot water outlet pipe. 222. A cold water inlet pipe 223, a cold water outlet pipe 224, a cooling water inlet pipe 225, and a cooling water outlet pipe 226. Each of the above-described pipes is connected to the hot water inlet 121, the hot water outlet 122, the cold water inlet 123, the cold water outlet 124, the cooling water inlet 125, and the cooling water outlet 126, respectively.

The water outflow inlets on the respective combination faces are communicated with each other through the water flow pipe, so that the absorption refrigeration unit 100 can simultaneously or separately introduce the hot water, the cold water and the cooling water from any one of the combined faces.

The absorption refrigeration unit 100 communicates with the external heat source, the cold source, the cooling water source or the adjacent absorption refrigeration unit 100 through the water flow interface on the four combined surfaces, and supplies or withdraws the water flow, and the hot water and the cold water are The cooling water is connected to the tube paths of the respective shell-and-tube heat exchangers (regenerator 201, condenser 202, evaporator 204, and absorber 203) inside the absorption refrigeration unit 100. The four hot water inlets 111, 121 and the like of the hot water are connected to the tube inlet of the regenerator 201 through the hot water inlet pipes 211, 221 built in the four walls to supply the heat to the absorption refrigeration unit 100. The four cold water inlets 113, 213, etc. of the cold water are connected to the tube inlet of the evaporator 204 through the cold water inlet pipes 213, 223 and the like. The four cooling water inlets 115, 125 and the like of the cooling water are connected to the condenser 202 and the tube inlet of the absorber 203 through the cooling water inlet pipes 215, 225 and the like. Similarly, the four hot water outlets 112, 122 of the hot water are connected to the tube outlet of the regenerator 201 through the hot water outlet pipes 212, 222 and the like built in the four wall plates. The four cold water outlets 114, 124 and the like of the cold water are connected to the tube outlet of the evaporator 204 through the cold water outlet pipes 214, 224 and the like built in the four wall plates. The four cooling water outlets 116, 126 and the like of the cooling water are connected to the condenser outlets of the condenser 202 and the absorber 203 through the cooling water outlet pipes 216, 226 and the like built in the four wall plates. In this way, a complete water flow duct system is formed, which forms an integral structure with the fuselage casing of the absorption refrigeration unit 100.

The water flow pipe system interconnects the same function water flow interfaces in different water flow interface groups; so that the absorption refrigeration unit 100 can simultaneously introduce hot water, cold water and cooling water through any one of the water flow interface groups. In the present embodiment, the water flow duct system allows the absorption refrigeration unit 100 to simultaneously or separately introduce hot water, cold water, and cooling water from any one of the combined surfaces.

4A is a schematic perspective view showing the three-dimensional installation structure of the solution heat exchanger 135 in the embodiment of the present invention.

The solution heat exchanger 135 is a plate heat exchanger. As shown in FIG. 1, the solution heat exchanger 135 is disposed in the recessed region of the side wall of the body casing of the absorption refrigeration unit 100, and is integrally formed with the refrigeration unit. As shown in FIG. 2, the solution tank 232 is substantially square, and cooperates with the internal structure of the lower portion of the fuselage casing of the absorption refrigeration unit 100, so that the entire solution tank 232 is perfectly matched and embedded in the fuselage casing of the absorption refrigeration unit 100. Internally, the volume of the absorption refrigeration unit 100 is made more compact. Solution tank 232 is used to recover the dilute lithium bromide solution produced in absorber 203 and to provide regenerator 201 with the desired dilute lithium bromide solution.

4B is a schematic view showing the structure of the exposed heat exchange wall 420 after the solution heat exchanger 135 has removed some components in the embodiment of the present invention.

In the solution heat exchanger 135, a plurality of heat exchange walls 420 are arranged in a plurality of layers, wherein the interior of the plate heat exchanger casing 424 is evenly spaced by a plurality of heat exchange walls 420 to form a passage for the hot and cold solution to flow: The dilute solution channel 412 and the concentrated solution channel 414 are separated. The low temperature lithium bromide solution and the high temperature lithium bromide concentrated solution are simultaneously in contact with the heat exchange wall plate 420, and the heat exchange wall plate 420 becomes a medium for heat exchange between the low temperature lithium bromide solution and the high temperature lithium bromide concentrated solution. The four corners of the solution heat exchanger 135 are respectively provided with inlets and outlets for the solution channels, respectively: a concentrated solution inlet 406 in the upper left corner, a concentrated solution outlet 402 in the lower left corner, a dilute solution inlet 401 in the lower right corner, and a thin upper left corner. Solution outlet 408.

Also visible in Figure 4B is a solution pump 231, a concentrated solution to the channel 404 of the shell side of the absorber 203, and a dilute solution to the channel 409 of the regenerator 201. The solution pump 231 is used to power the dilute solution flowing in the solution heat exchanger 135, pump it from the dilute solution inlet 401 in the lower right corner to the dilute solution outlet 408 in the upper left corner, and transport it to the regenerator 201 through the connecting pipe. In the solution dispenser (not shown).

As shown in FIG. 4B, a surface of the heat exchange wall 420 is stamped with a densely distributed, longitudinally and transversely woven strip 422 for supporting the heat exchange wall 420 to withstand The pressure generated by the vacuum causes turbulence in the fluid flowing through the ribs 422 to increase the heat transfer coefficient.

In the solution heat exchanger 135, the heat exchange wall 420 is made of plastic, and the heat exchange wall 420 has a thickness of 0.1 mm to 0.5 mm. In the present embodiment, the heat exchange wall panel 420 has a thickness of 0.15 mm. Compared with the metal heat exchange wall plate, such an extremely thin thickness compensates for the problem of insufficient heat transfer performance of the plastic, so that the heat transfer performance of the heat exchange wall plate 420 can meet the requirements of the absorption refrigerator. Since the heat exchange wall 420 is made of plastic, the phase With the metal heat exchange wall plate, the weight of the solution heat exchanger 135 can be greatly reduced, thereby achieving weight reduction. Since the plastic has excellent corrosion resistance, it can also avoid the generation of non-condensable gas due to corrosion of the heat exchange wall 420, which increases the working efficiency of the absorption refrigerator. At the same time, the heat exchange wall 420 made of plastic is easier to seal than the metal heat exchange wall.

The inventors have found through research that the traditional solution heat exchanger using metal heat exchanger wall plate is difficult to seal due to metal. In order to ensure the sealing performance of the solution heat exchanger, the shell can only be made of thick steel plate or casting. In order to further increase the weight of the solution heat exchanger and the corrosion resistance is poor.

To this end, in the present embodiment, the plate heat exchanger housing 424 of the solution heat exchanger 400 is also made of plastic, so that the seal between the plate heat exchanger housing 424 and the heat exchange wall 420 can be easily realized. The thickness of the plate heat exchanger housing 424 can be reduced. Thus, the weight of the solution heat exchanger 135 is further alleviated, and the corrosion resistance of the solution heat exchanger 135 is also enhanced. As an embodiment, the plate heat exchanger housing 424 and the heat exchange wall 420 may be made of the same kind of plastic and integrally molded by an injection molding process to provide excellent sealing performance.

In the present embodiment, the ribs 422 are made of plastic to ensure weight reduction. As an embodiment, the ribs 422 and the heat exchange wall 420 are made of the same plastic to facilitate manufacturing.

The wall spacing of the adjacent two layers of the heat exchange wall 420 is 0.5 mm to 3 mm. In the present embodiment, the spacing between the walls of the adjacent two layers of the heat exchange wall 420 is 1 mm. At the same time, since the thickness of the heat exchange wall plate 420 is 0.15 mm, the structure of the solution heat exchanger 135 is made more compact, and a larger heat exchange area is provided per unit volume, which is advantageous for miniaturization of the solution heat exchanger 135.

The regenerator 201, the condenser 202, the evaporator 204, and the absorber 203 are all shell-and-tube heat exchangers having similar structures. Hereinafter, the regenerator 201 and the condenser 202 will be described as an example. 3A is a schematic perspective view showing a condenser 202 and a side regenerator 201 in the embodiment of the present invention; and FIG. 3B is a schematic cross-sectional structural view of the condenser 202 and the side regenerator 201 in the embodiment of the present invention. 3A and 3B, there are two shell-and-tube heat exchangers 300, the shell-and-tube heat exchanger 300 on the left side constitutes the condenser 202, the shell-and-tube heat exchanger 300 on the right side and the solution distributor in the figure. 321 constitutes a regenerator 201.

The shell-and-tube heat exchanger 300 includes a heat exchange tube 310 and a shell-and-tube heat exchanger housing 322. A plurality of rows of heat exchange tubes 310 are arranged in upper and lower layers (only a part of the heat exchange tubes 310 are shown in the figure), and the heat exchange tubes 310 are fixed on the tubes In the heat exchanger housing 322. The shell-and-tube heat exchanger housing 322 constitutes the tube path of the shell-and-tube heat exchanger 300, and the heat exchange tube 310 constitutes the shell side of the shell-and-tube heat exchanger 300.

In the shell-and-tube heat exchanger 300, the heat exchange tube 310 is made of plastic, and the tube wall thickness of the heat exchange tube 310 is from 0.1 mm to 0.5 mm. In the present embodiment, the tube wall thickness of the heat exchange tube 310 is 0.15 mm. Compared with the metal heat exchange tube, the extremely thin thickness increases the heat exchange area by more than ten times in the same volume, which makes up for the problem that the heat transfer performance of the plastic is insufficient, so that the heat transfer performance of the heat exchange tube 310 can reach the absorption type. Refrigerator requirements. Since the heat exchange tube 310 is made of plastic, the weight of the shell-and-tube heat exchanger 300 can be greatly reduced as compared with the use of the metal heat-dissipating tube, thereby achieving weight reduction. Since the plastic has excellent corrosion resistance, it can also avoid the generation of non-condensable gas due to corrosion of the heat exchange tube 310, thereby increasing the working efficiency of the absorption refrigerator. At the same time, the heat exchange tube 310 made of plastic is easier to seal than the metal heat exchange tube.

The inventor discovered through research that the traditional shell-and-tube heat exchanger using metal heat exchange tube is difficult to seal due to metal. In order to ensure the sealing performance of the shell-and-tube heat exchanger, the shell can only be thick steel plate. Or the casting is made, thereby further increasing the weight of the shell-and-tube heat exchanger and having poor corrosion resistance.

To this end, in the present embodiment, the shell-and-tube heat exchanger housing 322 of the shell-and-tube heat exchanger 300 is also made of plastic, such that between the shell-and-tube heat exchanger housing 322 and the heat exchange tube 310 The sealing can be easily achieved, and the thickness of the shell-and-tube heat exchanger housing 322 can be reduced. Thus, the weight of the shell-and-tube heat exchanger 300 is further alleviated, and the corrosion resistance of the shell-and-tube heat exchanger 300 is also enhanced. As an embodiment, the shell-and-tube heat exchanger housing 322 and the heat exchange tube 310 may be made of the same kind of plastic and integrally molded by an injection molding process to provide excellent sealing performance.

Between adjacent two rows of heat exchange tubes 310, a plurality of support bars 301 are disposed at equal intervals, and the support bars 301 are disposed to intersect with the heat exchange tubes 310 and perpendicular to the heat exchange tubes 310. The support bar 301 is used to support the two rows of heat exchange tubes 310 adjacent to each other and to withstand the structural stress caused by the high vacuum in the shell-and-tube heat exchanger housing 322. In the present embodiment, the support bar 301 is made of plastic to ensure weight reduction. As an embodiment, the support bar 301 and the heat exchange tube 310 are made of the same plastic to facilitate manufacturing.

The solution dispenser 321 is a rectangular parallelepiped having a cavity inside for the flow of a dilute lithium bromide solution. The solution distributor 321 is disposed at the upper portion of the shell-and-tube heat exchanger 300 on the right side to collectively form the regenerator 201. A plurality of drain holes 340 are uniformly disposed on the solution distributor 321 . As an embodiment, the drain hole 340 In the case of the elongated holes, three rows are formed extending in the width direction of the solution distributor 321 and equally spaced apart to form a row. In the longitudinal direction of the solution distributor 321, a plurality of rows of drain holes 205 are provided at equal intervals. The bleed hole 205 is used to uniformly spray the dilute lithium bromide solution in the cavity to the lower heat exchange tube 310.

In the present embodiment, the solution dispenser 321 can also be made of plastic for further weight reduction. As an example, the solution dispenser 321 and the shell-and-tube heat exchanger housing 322 can be made of the same type of plastic to facilitate manufacturing, assembly, and sealing.

In addition to achieving weight reduction of the shell-and-tube heat exchanger 300, the inventors also desire to achieve miniaturization of the shell-and-tube heat exchanger 300. The miniaturized shell-and-tube heat exchanger 300 can make the absorption refrigerator 100 as small as a whole, and can be applied to a home or other place where the cooling power is not high.

However, the inventors discovered during the miniaturization of the shell-and-tube heat exchanger 300:

When the shell-and-tube heat exchanger 300 is used as the condenser 202, the heat exchange efficiency is not high, and it is difficult to meet the use requirements after miniaturization. The inventors have found through research that the heat exchange efficiency of the condenser 202 is not high because the refrigerant vapor enters the condenser 202 and undergoes heat exchange and heat exchange liquefaction with the heat exchange tube 310 to form water droplets on the surface of the heat exchange tube 310, and Collecting and freely dropping under the action of gravity, the condensed water is continuously dropped into the lower rows of heat exchange tubes 310 during the dropping process, and a descending water film is formed on the surface of the heat exchange tubes 310, especially at the lower arc of the heat exchange tubes 310. The thickness of the water film tends to be very thick, increasing the heat transfer resistance between the refrigerant vapor and the heat exchange tube 310, which is disadvantageous for the contact of the refrigerant vapor with the heat exchange tube 310, resulting in inefficient heat exchange.

When the shell-and-tube heat exchanger 300 is used as a part of the regenerator 201 and the absorber 203, as the cooling power is reduced, the required circulation amount of the working fluid is also reduced, and accordingly, the outer surface of the heat exchange tube 310 cannot be formed. The lithium bromide solution is sufficiently wetted to cause an unfavorable phenomenon of "dry spots". In order to avoid dry spots, the inventors tried to increase the flow rate of the circulation pump, and continuously sprayed the working fluid far more than the actual required circulation amount from the effluent pool at the bottom of the regenerator 201 and the absorber 203 to On top of the heat exchange tube 310. However, this increases the flow rate of the circulation pump, increasing parasitic energy consumption and operating costs. The trend is toward the development of miniaturization and home-based absorption chillers.

When the shell-and-tube heat exchanger 300 is used as the evaporator 204, since the specific heat capacity of the refrigerant water is large, the flow rate of the refrigerant water required to complete the rated cooling capacity is relatively small, and a complicated refrigerant distributor is required to accurately fix the refrigerant water. Distributed to each heat exchange tube 310, so that the refrigerant water fully wets the heat exchange tube 310 and along A water film (referred to as a falling film) having a uniform thickness reduction is formed on the surface of the heat exchange tube 310. As the refrigerant water evaporates, the refrigerant water is continuously reduced, so that the heat exchange tube 310 cannot be sufficiently wetted to cause a "dry spot" on the outer surface of the heat exchange tube 310. The appearance of dry spots greatly reduces the heat transfer coefficient of the evaporator 204. Therefore, in order to ensure sufficient wetting, it is necessary to dispose a dedicated refrigerant pump, and use a refrigerant water far more than the actual evaporation amount, and continuously pump the refrigerant water which has not evaporated from the bottom of the evaporator 204 under the pumping of the refrigerant pump. The top of the evaporator 204. The existence of the refrigerant pump increases the volume and weight of the refrigerator on the one hand, making it difficult to miniaturize the evaporator 204, and on the other hand, increases the running cost.

For the above reasons, the inventors optimized the outer diameter of the heat exchange tubes 310 and the center distance between adjacent heat exchange tubes 310. The outer diameter of the heat exchange tube 310 is set to 3 mm to 5 mm, the center distance of the adjacent heat exchange tubes 310 in the same row is set to 4 mm to 6 mm, and the center distance of the upper and lower adjacent heat exchange tubes 310 is set to 5 mm. ~8mm. In the present embodiment, the outer diameter of the heat exchange tube 310 is 3 mm; the center distance of the adjacent heat exchange tubes 310 in the same row is 4 mm; and the center distance of the upper and lower adjacent heat exchange tubes 310 is 7 mm. With the above-mentioned small-diameter, large-density heat exchange tubes 310, a large heat exchange area is obtained per unit volume, thereby achieving a smaller volume while satisfying high heat exchange efficiency.

Thus, when the shell-and-tube heat exchanger 300 is used as the condenser 202, the gap between the adjacent heat exchange tubes 310 of the same row is only 1 mm, so that the small gap can exert the beneficial effect of the surface tension of the refrigerant water, so that The refrigerant water condensed on the surface of the heat pipe 310 is collected at the gap and dropped. The first condensed refrigerant water does not drip onto the surface of the lower heat exchange tube 310 to form a water film, so that the thickness of the water film suspended on the lower surface of the heat transfer tube 310 is reduced, thereby improving the overall working efficiency of the condenser 202. In this way, the condenser 202 is miniaturized.

When the shell-and-tube heat exchanger 300 is used as part of the regenerator 201 and the absorber 203, the gap between adjacent heat exchange tubes 310 of the same row is only 1 mm, at which the surface tension and gravity of the lithium bromide solution The combined action enables the lithium bromide solution to have both a downward flow and a diffusion and accumulation at the gap, thereby ensuring that the refrigerant water is always immersed in the heat exchange tube 310. The lithium bromide solution and the heat exchange tube 310 are subjected to immersion and falling film combined heat exchange. At the same time, under the action of the surface tension of the lithium bromide solution, the lithium bromide solution does not need to fill the entire casing 201, and only the lithium bromide solution is required to finally immerse the heat exchange tube 310. Therefore, the deposition height of the lithium bromide solution at the gap can be adjusted according to the flow rate of the lithium bromide solution, so that the lithium bromide solution can uniformly immerse the heat exchange tube 310 even when the refrigeration load is small and the flow rate of the lithium bromide solution is small. In this way, the contact of the lithium bromide solution with the heat exchange tube 310 can be ensured without multiple pumping, the dry spot phenomenon is effectively eliminated, the parasitic energy consumption and the running cost are reduced, and the regenerator 201 and the absorber 203 are miniaturized.

When the shell-and-tube heat exchanger 300 is used as the evaporator 204, the outer diameter of the heat exchange tube 310 is only 3 mm, and the gap between the adjacent heat exchange tubes 310 of the same row is only 1 mm, so that the small gap can exert the refrigerant water. The beneficial effect of surface tension. Under the combined action of the surface tension of the refrigerant water and the gravity, a part of the refrigerant water forms a pile at the gap, diffuses and wets the heat exchange tube 310, and another portion drops through the gap to the heat exchange tube 310 of the lower layer. Next, at each gap of the heat exchange tubes 310, a part of the refrigerant water drops to the lower layer through the gap, and another portion of the deposit diffuses and wets the heat exchange tubes 310. By analogy, the refrigerant water flows through the heat exchange tubes 310 of each layer in sequence. The refrigerant water flows through the layer heat exchange tubes 310, all of which are completed by gravity. When the steady state operation is performed under the rated cooling condition, the refrigerant water passes through the uppermost heat exchange tube 310, and when it reaches the lowermost heat exchange tube 310, it is completely evaporated, and it is not necessary to use a refrigerant pump. When the refrigerant water flows through the gap, under the dual action of surface tension and gravity, there are both flow and accumulation at the gap; the gap can automatically adjust the accumulation height of the refrigerant water at the gap according to the flow rate of the refrigerant water. When the flow rate of the refrigerant water is large, the height of the liquid accumulated at the gap will flood the heat transfer tube 310, and the flow rate flowing through the gap is also large. When the flow rate of the refrigerant water is small, the liquid accumulated in the gap is low in height, but due to the wettability of the surface of the heat exchange tube 310, the refrigerant liquid will infiltrate the heat exchange tube 310, reducing the chance of "dry spots" on the surface of the heat exchange tube 310. Increase the heat transfer coefficient. In this way, it is not necessary to provide a dedicated refrigerant pump and a refrigerant distributor, which reduces the running cost and also facilitates miniaturization of the evaporator 204.

In order to further reduce the weight and size of the absorption refrigeration unit 100 and improve the sealing performance, the body casing, the water flow port, and the solution tank 232 of the absorption refrigeration unit 100 may be made of plastic. Even the components of the absorption refrigeration unit 100 are all made of plastic.

FIG. 5 is a schematic diagram of direct splicing of six absorption refrigeration units to form an absorption refrigeration matrix 500 in an embodiment of the present invention. The six absorption refrigeration units have the same structure as the absorption refrigeration unit 100. In order to better express the splicing form of the absorption refrigeration unit, in FIG. 5, the six absorption refrigeration units are numbered 501, 502, and 503, respectively. 504, 505, 506.

The six absorption refrigeration units 501, 502, 503, 504, 505, 506 are superimposed and combined in a 3×2 manner to form an absorption refrigeration matrix 500. Six refrigeration units 501, 502, 503, 504, The water flow interfaces on the adjacent combination faces of 505 and 506 are connected together, for example, the hot water inlets of the respective absorption refrigeration units are connected with the hot water inlets of the adjacent refrigeration units; from the hot water source (for example, boilers, solar water heaters) The supplied hot water is supplied through the hot water inlet 511 of the absorption refrigeration unit 501, and then the hot water is supplied to the regenerator of the respective absorption refrigeration unit through the hot water inlet pipe in each absorption refrigeration unit, and the hot water After the respective regenerators of the absorption refrigeration matrix exchange heat, the hot water outlet pipes of the respective absorption refrigeration units flow out, and finally the hot water of the absorption refrigeration matrix 500 returns from the hot water outlet 512 of the absorption refrigeration unit 503 to the heat. Water source. Similarly, the cold water from the cold load is input to the evaporator of the absorption refrigeration matrix 500 through the cold water inlet 513 of the absorption refrigeration unit 501, and is cooled by the refrigerant water in the evaporator, and then cooled from the absorption refrigeration unit 503. Exit 514 returns to a cold load. The cooling water from the cooling tower is supplied to the condenser and the absorber of the absorption refrigeration matrix 500 through the cooling water inlet 515 of the absorption refrigeration unit 501, and the heat discharged from the condenser/absorber is absorbed, and the cooling water is taken from the absorption refrigeration unit. The cooling water outlet 516 of 503 is returned to the cooling tower. The combined faces of adjacent absorption refrigeration units are in close contact.

In this way, the six absorption refrigeration units are combined to form a single working unit, and the combined cooling system has a cooling power of 6×3RT (about 66 kW), which is six times the power of the single absorption refrigeration unit, and is passed through a matrix. Combined to achieve a cooling power multiplier expansion.

In addition, in FIG. 5, if any of the absorption refrigeration units in the absorption refrigeration matrix 500 is shut down due to a failure, the operation of the entire matrix is not affected. The other units in the absorption refrigeration matrix 500 can still perform the cooling operation as a whole, but the cooling power is reduced.

In the absorption refrigeration unit provided by the embodiment of the invention, the heat exchange tube is made of plastic, and the wall thickness of the heat exchange tube is 0.1 mm to 0.5 mm. The thickness of the tube wall of such a heat exchange tube is much lower than that of the metal heat exchange tube, and the heat exchange area is increased by more than ten times under the same volume, thereby making up for the problem of insufficient heat transfer performance of the plastic, so that the heat transfer tube is transmitted. The thermal performance can meet the requirements of absorption chillers, and the absorption refrigeration unit can achieve weight reduction and miniaturization. At the same time, the heat exchange tube made of plastic is easy to seal, and can be integrally molded with other plastic parts by a precision injection molding process, thereby improving production efficiency. The plastic has strong corrosion resistance, can avoid non-condensable gas, increases the working efficiency of the absorption refrigeration unit, and reduces the maintenance frequency. Such an absorption refrigeration unit is suitable for use in a home and a commercial where power is required due to its weight reduction, miniaturization, and maintenance frequency.

The absorption refrigeration unit is also capable of forming a large absorption refrigeration matrix through a water flow interface group, which is highly expandable. Furthermore, it is only necessary to produce a standardized absorption refrigeration unit, and a plurality of absorption refrigeration units can be combined as needed during use, which greatly improves production efficiency, reduces manufacturing cost and production cycle.

The above description is only a part of the embodiments of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims (34)

1. An absorption refrigeration unit characterized by:

   The absorption refrigeration unit is an absorption refrigerating machine;

   The regenerator, absorber, condenser and evaporator of the absorption refrigeration unit are shell-and-tube heat exchangers, including a shell side consisting of a shell-and-tube heat exchanger housing, and being replaced by the shell-and-tube type a tube path formed by a heat exchange tube in the heat exchanger housing; the heat exchange tube is made of plastic;

   The solution heat exchanger of the absorption refrigeration unit is a plate heat exchanger, the plate heat exchanger is provided with a plate heat exchanger casing and a heat exchange wall plate; the heat exchange wall plate is fixed to the plate heat exchanger Inside the housing, the heat exchange wall panel is made of plastic.
2. The absorption refrigeration unit according to claim 1, wherein:

   The tube wall thickness of the heat exchange tube is 0.1 to 0.5 mm.
3. The absorption refrigeration unit according to claim 2, wherein:

   The wall thickness of the heat exchange tube is 0.15 mm.
4. The absorption refrigeration unit according to claim 1, wherein:

   A plurality of rows of the heat exchange tubes are arranged in an upper and lower layer; a plurality of support strips are arranged at intervals between the two adjacent rows of the heat exchange tubes; and the support strips are used for supporting the adjacent two rows of the heat exchange tubes.
5. The absorption refrigeration unit according to claim 4, wherein:

   The support strip is made of plastic.
6. The absorption refrigeration unit according to claim 5, wherein:

   The support strip and the heat exchange tube are made of the same plastic.
7. The absorption refrigeration unit according to claim 1, wherein:

   a plurality of rows of the heat exchange tubes are arranged in an upper and lower layer; the outer diameter of the heat exchange tubes is 3 mm to 5 mm;

   The center distance of the adjacent heat exchange tubes located in the same row is 4 mm to 6 mm;

   The center distance of the heat exchange tubes adjacent to each other is 5 mm to 8 mm.
8. The absorption refrigeration unit according to claim 7, wherein:

   The outer diameter of the heat exchange tube is 3 mm;

   The center distance of the adjacent heat exchange tubes located in the same row is 4 mm;

   The center distance of the heat exchange tubes adjacent to each other is 7 mm.
9. The absorption refrigeration unit according to claim 1, wherein:

   The shell-and-tube heat exchanger housing is made of plastic.
10. The absorption refrigeration unit according to claim 9, wherein:

    The shell-and-tube heat exchanger housing and the heat exchange tube are made of the same plastic.
11. The absorption refrigeration unit according to claim 1, wherein:

    The heat exchange wall has a thickness of 0.1 mm to 0.5 mm.
12. The absorption refrigeration unit according to claim 11, wherein:

    The heat exchange wall has a thickness of 0.15 mm.
13. The absorption refrigeration unit according to claim 1, wherein:

    The heat exchange wall plate is provided with textured ridges for supporting the heat exchange wall plate, and turbulent flow of the fluid flowing through the ridges to improve the heat transfer coefficient.
14. The absorption refrigeration unit according to claim 13, wherein:

    The ribs are made of plastic.
15. The absorption refrigeration unit according to claim 14, wherein:

    The ribs and the heat exchange wall are made of the same plastic.
16. The absorption refrigeration unit according to claim 1, wherein:

    The heat exchange wall panels are arranged in a plurality of layers;

    The wall spacing of the heat exchange wall panels of two adjacent layers is 0.5 mm to 3 mm.
17. The absorption refrigeration unit according to claim 16, wherein:

    The wall spacing of the heat exchange wall panels of two adjacent layers is 1 mm.
18. The absorption refrigeration unit according to claim 1, wherein:

    The plate heat exchanger housing is made of plastic.
19. The absorption refrigeration unit according to claim 18, wherein:

    The plate heat exchanger housing and the heat exchange wall panel are made of the same plastic.
20. The absorption refrigeration unit according to claim 1, wherein:

    The body casing of the absorption refrigeration unit is made of plastic.
21. The absorption refrigeration unit according to claim 1, wherein:

    The absorption refrigeration unit has a plurality of water flow interfaces for introducing and discharging cold water, hot water and cold Water; the water flow interface is made of plastic.
22. The absorption refrigeration unit according to claim 1, wherein:

    The components of the absorption refrigeration unit are all made of plastic.
23. The absorption refrigeration unit according to any one of claims 1 to 22, wherein:

    The absorption refrigeration unit is provided with at least two groups of water flow interface groups, each group of the water flow interface group including at least a water flow interface as an inlet and an outlet of hot water, a water flow interface as an inlet and an outlet of cold water, and an inlet for cooling water. And the outlet of the water flow;

    Adjacent said absorption refrigeration units can be interconnected by said water flow interface such that any number of said absorption refrigeration units can be plugged into each other through said water flow interface to form an absorption refrigeration matrix.
24. The absorption refrigeration unit according to claim 23, wherein:

    The absorption refrigeration unit is provided with at least two combined surfaces; each group of the water flow interface group is distributed on the combined surface.
25. The absorption refrigeration unit according to claim 24, wherein:

    The fuselage shell of the absorption refrigeration unit is a rectangular parallelepiped, and the combined surface is six surfaces of the fuselage shell;

    Each of the combination faces is provided with a group of the water flow interface groups;

    Adjacent said absorption refrigeration units can be interconnected by said water flow interface such that any number of said absorption refrigeration units can be plugged into each other through said water flow interface to form said matrix of said absorption refrigeration matrix.
26. The absorption refrigeration unit according to claim 25, wherein:

    The combined surface of the absorption refrigeration unit is used to closely adhere to the combined surfaces of the adjacent absorption refrigeration units to form a matrix-type absorption refrigeration matrix.
27. The absorption refrigeration unit according to claim 25, wherein:

    The water flow interfaces on at least one of the opposing sets of surfaces are mirror symmetrical to each other.
28. The absorption refrigeration unit according to claim 23, wherein:

    a water flow duct system is disposed in the fuselage casing of the absorption refrigeration unit, the water flow duct system interconnecting the water flow interfaces of the same function in different water flow interface groups; the water flow The piping system is also coupled to the tube of the shell-and-tube heat exchanger such that the absorption refrigeration unit can simultaneously or separately introduce hot water, cold water, and cooling water through any one of the water flow interface groups.
29. The absorption refrigeration unit according to claim 28, wherein:

    The water flow conduit system forms an integral structure with the fuselage housing.
30. The absorption refrigeration unit according to claim 28, wherein:

    The water flow pipeline system comprises a hot water inlet pipe, a hot water outlet pipe, a cold water inlet pipe, a cold water outlet pipe, a cooling water inlet pipe, and a cooling water outlet pipe;

    The hot water inlet pipe connects the hot water inlet and the inlet of the tube of the regenerator;

    The hot water outlet pipe connects the hot water outlet and the outlet of the tube of the regenerator;

    The cold water inlet pipe connects the cold water inlet and the inlet of the tube of the evaporator;

    The cold water outlet pipe connects the cold water outlet and the outlet of the evaporator of the evaporator;

    The cooling water inlet pipe connects the cooling water inlet and the inlet of the absorber and the tube of the condenser;

    The cooling water outlet conduit connects the cooling water outlet and the outlet of the absorber and the tube of the condenser.
31. The absorption refrigeration unit according to any one of claims 1 to 22, wherein:

    The regenerator and the condenser are located in an upper portion of a body casing of the absorption refrigeration unit, wherein

    The regenerator is configured to heat and evaporate the refrigerant water absorbed in the dilute solution to obtain the refrigerant vapor; the heat absorbed by the evaporation process is provided by the hot water of the tube of the regenerator;

    The condenser is configured to cool and condense the refrigerant vapor obtained in the regenerator into refrigerant water, and the refrigerant water flows to the shell side of the evaporator after throttling.
32. The absorption refrigeration unit according to any one of claims 1 to 22, wherein:

    The evaporator and the absorber are located in a lower portion of the body casing of the absorption refrigeration unit, wherein

    The evaporator is used for evaporating heat of the shell-side refrigerant water to cool the cold water of the tube;

    The absorber is used to absorb the refrigerant vapor generated by the shell side of the evaporator into the concentrated solution, and the heat released during the absorption is carried away by the cooling water of the tube.
33. The absorption refrigeration unit according to any one of claims 1 to 22, wherein:

    The absorption refrigeration unit also includes a solution tank for recovering a dilute solution produced in the absorber and providing the regenerator with a dilute solution as needed.
34. The absorption refrigeration unit according to claim 33, wherein:

    The solution tank is made of plastic. 35. An absorption refrigeration matrix characterized by:

    A plurality of absorption refrigeration units according to any one of claims 1 to 34.

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