generator

Abstract

The generator (120) includes a housing (200) and a housing receiving cavity (303) defined by the housing (200). The housing cavity (303) includes an upper cavity portion (304), a middle cavity portion (306), and a lower cavity portion (308), a first group of heat exchange tubes (382) disposed in the upper cavity portion (304) and immersed in the upper solution, a second group of heat exchange tubes (384) disposed in the lower cavity portion (308), and a dispenser (307) disposed in the middle cavity portion (306), which receives the upper solution from the upper cavity portion (304) and dispenses the upper solution ejected from the upper cavity portion (304) onto the second group of heat exchange tubes (384). By dividing the heat exchange tube bank into two heat exchange tube banks, the height of the upper flooded heat exchange tube bank (382) is reduced, thereby reducing the influence of hydrostatic pressure on the bottom pipe line, and the lower falling film heat exchange tube bank (384) is separated from the high temperature heat source inlet, which effectively prevents the solution from crystallizing at the falling film heat exchange tube bank due to the excessive temperature difference.

Description

[Technical Field]

[0001] This application relates to generators, and in particular to generators that use a solution (e.g., a lithium bromide solution) as an absorbent. [Background technology]

[0002] Some air conditioning systems include a generator. During operation, such systems require the injection of a dilute solution (e.g., a dilute lithium bromide solution) into the generator. The generator's function is to heat the dilute solution using a heat source to produce refrigerant vapor in the dilute solution. During operation, the original dilute solution is condensed into a concentrated solution. Generators have two operating modes: flooded generators and falling film generators. Flooded generators are a type of heat exchange device in which the heat exchange tubes are immersed in the dilute solution, and a high-temperature heat source flows through the tubes to heat the solution outside the tubes, causing the solution to condense and produce refrigerant vapor. Falling film generators are a type of heat exchange device in which the solution is distributed on the outer walls of the heat exchange tubes, where the solution adheres to the outer walls of the heating tubes in the form of a film, causing the solution to condense and produce refrigerant vapor. Summary of the Invention [Problem to be solved by the invention]

[0003] The disadvantage of the flooded generator is that when the flooded generator is operated, the solution enters the high generator and fills the heat exchange tube bundle with solution. However, due to the influence of hydrostatic pressure, the boiling point of the solution in the heat exchange tube bundle at the bottom of the flooded generator is higher and the heat transfer temperature difference is smaller, so the heat exchange efficiency of the flooded generator gradually decreases from the top to the bottom of the heat exchange tube bundle.

[0004] A drawback of falling film generators is that when a falling film generator is in operation, the solution is uniformly distributed over the top of the heat exchange tube bank through the dispenser and condenses in a film-like form on the outer walls of the heat exchange tubes, producing refrigerant vapor. The condensed solution drips onto the lower rows of heat exchange tubes and continues to condense. Because the heat exchange tubes in the falling film section of the generator are located at the inlet of the high-temperature heat source, the temperature of the heat source at the inlet of the high-temperature heat source is high, the heat transfer temperature difference is large, and the solution boils violently. Therefore, a large amount of refrigerant vapor is produced per unit of solution, resulting in a higher solution concentration. If a falling film generator cannot provide a sufficient amount of solution in the high-temperature heat source section and cannot form a uniform falling film on the surface of the heat exchange tube, crystallization spots may form on the surface of the heat exchange tube. [Means for solving the problem]

[0005] To overcome the drawbacks of flooded and falling film generators, the present application divides the generator into three sections: an upper housing cavity section, a middle housing cavity section, and a lower housing cavity section. The upper housing cavity section includes a bank of flooded heat exchange tubes that operates in a flooded mode. The lower housing cavity section includes a bank of falling film heat exchange tubes that operates in a falling film mode. A dispenser in the middle housing cavity section directs the solution in the upper housing cavity section onto the outer walls of the falling film heat exchange tubes in the lower housing cavity section.

[0006] The generator operates as follows: the dilute solution enters the Shellpass flooded heat exchange tube bank from the top of the generator. The dilute solution is heated by the heat source within the tube and condenses to produce refrigerant vapor, forming an intermediate-concentration solution. The intermediate-concentration solution then flows out of the weir and enters the dispenser through a pipe. The intermediate-concentration solution flows through the dispenser and drips evenly onto the outer wall of the falling-film heat exchange tube bank (comprising at least one row of heat exchange tubes), forming a liquid film. The liquid film is further heated and condensed to produce refrigerant vapor, forming a concentrated solution. The refrigerant vapor then exits the passages on both sides. The tube-side fluid heat source (e.g., high-temperature steam or hot water) first enters the flooded heat exchange tube bank, heats the dilute solution, and then condenses into condensed water (or the temperature of the hot water decreases). The condensed water then enters the falling-film heat exchange tube bank to further heat the solution before being discharged.

[0007] The structure of the present application has at least two technical advantages. First, in the top-flooded operation mode, the heat exchange tube bank is divided into two heat exchange tube banks (flooded heat exchange tube bank and falling film heat exchange tube bank), which reduces the height of the top-flooded heat exchange tube bank. This reduced height reduces the impact of hydrostatic pressure on the bottom pipe line. Second, in the bottom-falling film operation mode, the high-temperature heat source enters the flooded section first, while the low-temperature heat source enters the falling film section, which effectively prevents the solution from crystallizing in the falling film heat exchange tube bank due to excessive temperature differences. Furthermore, the heat exchange tubes in the falling film section of the generator are not located at the inlet of the high-temperature heat source, further preventing crystallization due to excessive temperature differences.

[0008] Specifically, according to a first aspect of the present application, there is provided a generator comprising: a housing; and a housing accommodating cavity defined by the housing, the housing accommodating cavity including an upper accommodating cavity portion, an intermediate accommodating cavity portion, and a lower accommodating cavity portion, the intermediate accommodating cavity portion being disposed between the upper accommodating cavity portion and the lower accommodating cavity portion; a first group of heat exchange tubes being disposed within the upper accommodating cavity portion; an upper solution being accommodated in the upper accommodating cavity portion; the first group of heat exchange tubes being at least partially immersed in the upper solution; at least one row of a second group of heat exchange tubes being disposed within the lower accommodating cavity portion; and a dispenser being disposed within the intermediate accommodating cavity portion, the dispenser receiving the upper solution from the upper accommodating cavity portion and dispensing the upper solution ejected from the upper accommodating cavity portion onto the second group of heat exchange tubes. [Effects of the Invention]

[0009] According to a first aspect of the present application, a container is further disposed on the upper receiving cavity portion, and the upper solution is received in the container.

[0010] According to a first aspect of the present application, a solution introduction passage is further provided in the housing accommodating cavity, and the solution introduction passage introduces the upper solution into the dispenser.

[0011] According to the first aspect of the present application, the upper storage cavity portion is further provided with a weir, which constitutes a fluid inlet of the solution introduction passage.

[0012] According to the first aspect of the present application, the first group of heat exchange tubes is completely immersed in the upper solution, and the height of the weir is set to a position not lower than the uppermost end of the first group of heat exchange tubes.

[0013] According to a first aspect of the present application, the generator further includes a fluid inlet and a fluid outlet, the fluid inlet being in fluid communication with the first group of heat exchange tubes and used to input a fluid heat source into the first group of heat exchange tubes, the fluid heat source heating the upper solution while flowing through the first group of heat exchange tubes, and then flowing into the second group of heat exchange tubes to continue heating the lower solution that is distributed onto the second group of heat exchange tubes, the fluid heat source heating the lower solution, and then being discharged from the fluid outlet.

[0014] According to a first aspect of the present application, a distribution passage is provided in the dispenser, and the distribution passage distributes the solution introduced from the upper accommodating cavity portion onto the second group of heat exchange tubes.

[0015] According to a first aspect of the present application, the distribution passage is a through hole.

[0016] According to the first aspect of the present application, the inner diameters of the heat exchange tubes on both sides of the second heat exchange tube group are smaller than the inner diameter of the heat exchange tube in the center of the second heat exchange tube group.

[0017] According to a first aspect of the present application, the housing accommodating cavity further includes a solution refill inlet, which is used to refill the dispenser with solution.

[0018] According to a first aspect of the present application, the bottom of the dispenser is disposed obliquely along the longitudinal direction of the generator such that the bottom of the dispenser has an inclination angle along the longitudinal direction.

[0019] According to a first aspect of the present application, the inclination angle of the bottom of the dispenser is within 5°.

[0020] According to a first aspect of the present application, a through hole is provided in the bottom of the upper storage cavity portion, whereby the bottom of the upper storage cavity portion constitutes the dispenser.

[0021] According to a first aspect of the present application, the housing further includes a housing wall, and the generator further includes two solution inlets, which are used to input the upper solution, and the two solution inlets respectively penetrate from both ends of the upper part of the housing accommodating cavity through the housing wall into the housing accommodating cavity, and the weir is positioned at a position between the two solution inlets.

[0022] According to a first aspect of the present application, fins are provided on the second group of heat exchange tubes, or the surface of the second group of heat exchange tubes is roughened.

[0023] According to a second aspect of the present application, there is provided an air conditioning system, the air conditioning system including a generator according to the first aspect of the present application.

[0024] These and other features and advantages of the present application can be better understood by reading the following detailed description in conjunction with the accompanying drawings, in which like reference numerals refer to like elements and in which: [Brief explanation of the drawings]

[0025] [Figure 1A] 1 shows a schematic block diagram of components of an air conditioning system 100 of the present application. [Figure 1B] 2 shows another schematic block diagram of the components of the air conditioning system 100 of the present application. [Figure 2A] 1A-1B show a side cross-sectional view of the internal structure of the generator shown in FIG. 1A, illustrating a first embodiment of the generator of the present application. [Figure 2B] 2B shows a top view of the generator shown in FIG. 2A. [Figure 3A] 2B shows a cross-sectional view taken along line AA in FIG. 2A. [Figure 3B] FIG. 3B is a diagram showing a more detailed structure of the dispenser 307 shown in FIG. 3A. [Figure 3C] A schematic structural diagram of the distribution passage 314 in FIG. 3B is shown. [Figure 4] 3A shows a second embodiment of the generator shown in FIGS. 1A-1B from the same viewing angle as the generator in FIG. 3A. [Figure 5] 3A shows a third embodiment of the generator shown in FIGS. 1A-1B from the same viewing angle as the generator in FIG. 3A. [Figure 6] 2A shows a fourth embodiment of the generator shown in FIGS. 1A-1B from the same viewing angle as the generator in FIG. 2A. [Figure 7] 2A shows a fifth embodiment of the generator shown in FIGS. 1A-1B from the same viewing angle as the generator in FIG. 2A. [Figure 8A] 1A-1B, from the same viewing angle as the generator in FIG. 3A. [Figure 8B] 8B is a partially enlarged schematic view of the axial direction of the falling film heat exchange tube bundle 884 having fins shown in FIG. 8A. [Figure 8C] 8B is a schematic diagram showing an enlarged radial portion of a falling film heat exchange tube bank 884 having fins shown in FIG. 8A. [Figure 9] 5 shows a block diagram of the controller 508 in the generator 520 shown in FIG. 5, illustrating specific components and connections of the controller 508. DETAILED DESCRIPTION OF THE INVENTION

[0026] FIG. 1A shows a schematic block diagram of the components of the present air conditioning system 100, illustrating an application environment for the air conditioning system 100 including two generators.

[0027] 1A, the air conditioning system 100 of the present application includes an evaporator 110, a first generator 120, an absorber 130, a second generator 140, and a condenser 150. The first generator 120 is provided with a fluid inlet 182 (the fluid here may be high-temperature steam or hot water), a fluid outlet 184 (the fluid here may be condensed water of the high-temperature steam or a fluid whose temperature is lower than that at the fluid inlet), a solution inlet 186, a solution outlet 187, and a refrigerant vapor outlet 188 (see the description of FIG. 2A for details). The air conditioning system 100 includes a solution circulation route and a refrigerant circulation route.

[0028] The solution circulation route is as follows: the concentrated solution entering the absorber 130 absorbs the refrigerant vapor from the evaporator 110 to become a dilute solution; the dilute solution passes through the first solution pump 160 and flows into the first generator 120 and the second generator 140, respectively; the dilute solution flowing into the first generator 120 is heated by the high-temperature steam and concentrated into a concentrated solution; the dilute solution flowing into the second generator 140 is heated by the refrigerant vapor from the first generator 120 and concentrated into a concentrated solution; after mixing, the concentrated solutions from the first generator 120 and the second generator 140 are sent to the absorber 130 by the second solution pump 170, where they absorb the refrigerant vapor from the evaporator 110 to complete the solution circulation.

[0029] The refrigerant circulation route is as follows: the refrigerant vapor generated in the first generator 120 enters the heat exchange tubes of the second generator 140, heats the solution in the second generator 140, and is condensed into refrigerant water; the refrigerant water and the refrigerant vapor generated in the second generator 140 enter the condenser 150, where they are further condensed; the refrigerant water leaving the condenser 150 enters the evaporator 110, absorbs heat on the outer walls of the heat exchange tubes of the evaporator 110, and evaporates into refrigerant vapor; the refrigerant vapor enters the absorber 130 and is absorbed by the concentrated solution; the solution that has absorbed the refrigerant vapor enters the first generator 120 and the second generator 140, where it is heated to generate refrigerant vapor, thereby completing the refrigerant circulation.

[0030] 1B shows another schematic block diagram of components of the present air conditioning system 100. Compared to the block diagram of components shown in FIG. 1A, the second generator 140 is not included in the block diagram of components of FIG. 1B, which shows an application environment of the air conditioning system 100 including one generator 120.

[0031] 1B, the air conditioning system 100 of the present application includes an evaporator 110, a generator 120, an absorber 130, and a condenser 150. The generator 120 is provided with a fluid inlet 182 (the fluid here may be high-temperature steam or hot water), a fluid outlet 184 (the fluid here may be condensed water of the high-temperature steam or a fluid whose temperature is lower than that at the fluid inlet), a solution inlet 186, a solution outlet 187, and a refrigerant vapor outlet 188 (see the description of FIG. 2A for details). The air conditioning system 100 includes a solution circulation route and a refrigerant circulation route.

[0032] The solution circulation route is as follows: the concentrated solution that enters the absorber 130 absorbs the refrigerant vapor from the evaporator 110 to become a dilute solution, the dilute solution flows into the generator 120 through the first solution pump 160, the dilute solution that flows into the generator 120 is heated by the high-temperature steam and concentrated into a concentrated solution, and the concentrated solution is sent to the absorber 130 by the second solution pump 170 to absorb the refrigerant vapor from the evaporator 110, thereby completing the solution circulation.

[0033] The refrigerant circulation route is as follows: the refrigerant vapor generated in the generator 120 enters the condenser 150 and is condensed there; the refrigerant water coming out of the condenser 150 enters the evaporator 110, absorbs heat on the outer wall of the heat exchange tube of the evaporator 110 and evaporates into refrigerant vapor; the refrigerant vapor enters the absorber 130 and is absorbed by the concentrated solution; the solution that has absorbed the refrigerant vapor enters the generator 120 and is heated to generate refrigerant vapor, thereby completing the refrigerant circulation.

[0034] Hereinafter, the specific structure of the generator of the present application will be described using the first generator shown in FIG. 1A and the generator shown in FIG. 1B as examples.

[0035] FIG. 2A shows a side cross-sectional view of the internal structure of the generator shown in FIGS. 1A-1B, illustrating some specific structures of the first embodiment of the generator of the present application.

[0036] As shown in FIG. 2A , the generator 120 includes a housing 200, which has dome-shaped ends and a rectangular central portion. The upper left end of the housing 200 is provided with a solution inlet 186 for inputting the dilute solution to be concentrated into the generator 120, the top of the housing 200 is provided with a refrigerant vapor outlet 188 for outputting the refrigerant vapor within the housing cavity, and the bottom of the housing 200 is provided with a solution outlet 187 for discharging the concentrated solution. The upper right end of the housing 200 is provided with a fluid inlet 182, shown from the side, for inputting a high-temperature heat source into the generator 120. The lower right end of the housing 200 is provided with a fluid outlet 184, shown from the side, for outputting condensed water generated after heat exchange with the high-temperature heat source.

[0037] 2A, a weir 252 and a solution introduction passage 256, shown in side view, are provided within the housing receiving cavity of the generator 120, with the weir 252 being a fluid inlet for the solution introduction passage 256. The solution introduction passage 256 is used to introduce solution within the upper receiving cavity portion 304 of the housing to a dispenser 307 in the middle receiving cavity portion 306 (see FIG. 3A). The side cross-sectional view of the generator 120 further shows an inlet hole 254 in the dispenser 307 for introducing solution from the solution introduction passage 256 into the dispenser 307.

[0038] Figure 2B shows a top view of the generator 120 shown in Figure 2A, more clearly illustrating the relative positions of the solution inlet 186 and the refrigerant vapor outlet 188. Referring to Figure 2B, a plan view of the solution inlet 186, the refrigerant vapor outlet 188, and the fluid inlet 182 is shown. Figure 2B also shows a plan view of the solution introduction passage 256.

[0039] FIG. 3A shows a cross-sectional view along line AA of FIG. 2A to show more of the internal components of the generator.

[0040] 3A, the generator 120 includes a housing 200, which includes a housing wall 322 and a housing receiving cavity 303, which includes an upper receiving cavity portion 304, a lower receiving cavity portion 308, and a middle receiving cavity portion 306 disposed between the upper receiving cavity portion 304 and the lower receiving cavity portion 308. The upper receiving cavity portion 304 is further provided with a container 360 for receiving an upper solution.

[0041] Specifically, multiple rows of flooded heat exchange tubes 382 are disposed within the upper receiving cavity portion 304 of the housing 200. The upper solution enters the upper receiving cavity portion 304 through the solution inlet 186 such that the flooded heat exchange tubes 382 are fully immersed in the upper solution. In some other embodiments, the flooded heat exchange tubes 382 may also be partially immersed in the upper solution.

[0042] Dispenser 307 is provided in middle receiving cavity portion 306 of housing 200, and dispenser 307 includes inlet hole 254 for introducing solution in solution introduction passage 256 into dispenser 307. Figure 3A further shows weir 252 and solution introduction passage 256 from a different perspective than in Figure 2A, where weir 252 is a fluid inlet for solution introduction passage 256 located in upper receiving cavity portion 304, and solution introduction passage 256 is used to introduce solution in upper receiving cavity portion 304 of the housing into dispenser 307. In order to completely immerse the flooded heat exchange tube group 382 in the upper accommodating cavity portion 304 in the upper solution, the height of the weir 252 is set to a position above the top end of the flooded heat exchange tube group 382 (as shown by the horizontal line 353 (dashed line) in Figure 3A), so that the upper solution flows through the weir 252 into the solution introduction passage 256 only when the liquid level of the upper solution is above the horizontal line 353 at the top end of the flooded heat exchange tube group 382, ​​thereby ensuring that the flooded heat exchange tube group 382 is completely immersed in the upper solution.

[0043] At least one row of falling film heat exchange tubes 384 is disposed within the lower cavity portion 308 of the housing 200. A solution 390 from a dispenser 307 is dispensed onto the outer walls of the heat exchange tubes in the falling film heat exchange tubes 384, forming a liquid film on the outer walls. In one embodiment, the solution 390 is dispensed uniformly onto the outer walls of the upper row of falling film heat exchange tubes 384 and condenses in a film-like form to produce refrigerant vapor. The condensed solution continues to condense by dripping onto the lower row of heat exchange tubes. The lower cavity portion 308 of the housing 200 is further provided with a solution outlet 187 for discharging the condensed solution. Refrigerant vapor passages 332 and 334 are provided on both sides of the housing cavity 303 to guide the refrigerant vapor generated in the lower cavity portion 308 to the refrigerant vapor outlet 188 for discharge.

[0044] It should be noted that the tube side of the flooded heat exchange tube group 382 in the upper accommodating cavity portion 304 is fluidly connected to the tube side of the falling film heat exchange tube group 384 in the lower accommodating cavity portion 308, thereby allowing the fluid heat source (e.g., high temperature steam) in the flooded heat exchange tube group 382 to condense into condensed water and then flow into the falling film heat exchange tube group 384 to further heat the lower solution.

[0045] 2A and 3A, the fluid heat source (e.g., high-temperature steam) of the generator 120 enters the tube side of the flooded heat exchange tube bank 382 through the tube-side fluid inlet 182. After the high-temperature steam completes a first step of heat exchange in the flooded heat exchange tube bank 382, ​​it enters the falling film heat exchange tube bank 384 in the form of condensed water. After the condensed water completes a second step of heat exchange in the falling film heat exchange tube bank 384, it is discharged from the tube-side fluid outlet 184.

[0046] 3B shows a more detailed structure of the dispenser 307 located in the intermediate receiving cavity portion 306 shown in FIG. 3A. FIG. 3C shows a structural schematic diagram of the dispensing passage 314 in FIG. 3B to show the specific structure of the dispenser 307.

[0047] As shown in Figure 3B, the inlet hole 254 (see the description of Figure 2A above) and the distribution passage 314 are provided in the dispenser 307, and the distribution passage 314 is used to deliver the solution (intermediate concentration solution) from the upper receiving cavity portion 304 to the lower receiving cavity portion 308. In one embodiment of the present application, the dispenser 307 is a drawer-shaped member having four side walls 372 and a bottom 374. The distribution passage 314 may be disposed on the bottom 374 of the dispenser 307 to distribute the solution 390 received in the dispenser 307 onto the falling film heat exchange tube bank 384.

[0048] In one embodiment of the present application, the distribution passage 314 may be a through-hole 316. Referring to the partially enlarged cross-sectional view of the distribution passage 314 in Figure 3C, the opening of the through-hole 316 is inclined downward, so that the edge 317 of the hole and the bottom 374 of the dispenser 307 form an inclination angle α, which makes it easy for the solution to drip from the through-hole 316. When the solution enters the dispenser 307 from the upper accommodating cavity portion 304, the through-hole 316 allows the solution (intermediate concentration solution) introduced from the upper accommodating cavity portion 304 to drip onto the top of the falling film heat exchange tube bank 384 for subsequent concentration.

[0049] In another embodiment of the present application, the bottom of the upper accommodating cavity portion 304 can function as a dispenser 307. Specifically, through-holes are disposed at the bottom of the upper accommodating cavity portion 304 such that the upper solution in the upper accommodating cavity portion 304 flows through the through-holes and is directly dispensed onto the falling film heat exchange tube bank 384 of the lower accommodating cavity portion 308.

[0050] FIG. 4 shows a second embodiment of the generator shown in FIGS. 1A-1B, from the same viewing angle as the generator in FIG. 3A.

[0051] Since the structure of the generator 420 shown in Fig. 4 is similar to that of the generator 120 in Fig. 3A, the same structural parts will not be described here. The structural difference is that the heat exchange tubes on both sides of the falling film heat exchange tube bank 484 shown in Fig. 4 are replaced with smaller diameters, that is, the inner diameters of the heat exchange tubes on both sides of the falling film heat exchange tube bank 484 are smaller than the inner diameter of the heat exchange tube in the middle, thereby increasing the flow area of ​​the refrigerant vapor and reducing the flow rate of the refrigerant vapor. To compensate for the lost heat exchange area, the number of rows of heat exchange tubes can be increased to achieve the same heat exchange area.

[0052] In a falling film generator, the flow rate of the solution gradually decreases from the top to the bottom of the heat exchange tube bank, and the amount of refrigerant vapor generated gradually increases. Research has shown that the falling film heat exchange coefficient is proportional to the flow rate of the solution through the falling film heat exchange tubes and inversely proportional to the flow rate of the refrigerant vapor and the diameter of the heat exchange tubes. Therefore, after replacing the falling film heat exchange tube bank 484 with a smaller tube diameter, the heat exchange coefficient of the generator 420 in Figure 4 is superior to that of the generator 120 in Figure 3A.

[0053] FIG. 5 shows a third embodiment of the generator shown in FIGS. 1A-1B, from the same viewing angle as the generator in FIG. 3A.

[0054] The structure of the generator 520 shown in Figure 5 is similar to that of the generator 120 in Figure 3A, so the description of the same structure will be omitted here. The structural difference is that the generator 520 shown in Figure 5 adds a diluted solution refilling line 510 to refill the dispenser 307 with solution to further improve the coefficient of the heat exchange tube in the falling film section of the generator and effectively control the stability of the solution dripping in this section.

[0055] 5, refill line 510 is a branch of the fluid line at solution inlet 186 and is in fluid communication with solution introduction passage 256. Refill line 510 includes solution refill inlet 502 and liquid refill valve 504. To effectively control the opening and closing of liquid refill valve 504, in this embodiment, generator 520 is further provided with a liquid level sensor 512 located at the outlet of the flooded heat exchange tube bank, a shell-pass pressure sensor 514, a solution outlet temperature sensor 516, and a controller 508. Controller 508 may control the opening and closing of liquid refill valve 504 via connecting line 532 by receiving parameters provided by liquid level sensor 512 via connecting line 522, or by receiving parameters provided by shell-pass pressure sensor 514 via connecting line 524 and by receiving parameters provided by solution outlet temperature sensor 516 via connecting line 526.

[0056] In one embodiment of the present application, the amount of solution provided by the dilute solution replenishment line 510 is 1% to 50% of the amount of solution provided by the solution inlet 186 .

[0057] FIG. 6 shows a fourth embodiment of the generator shown in FIGS. 1A-1B, from the same viewing angle as the generator in FIG. 2A.

[0058] Because the structure of the generator 620 shown in FIG. 6 is similar to that of the generator 120 shown in FIG. 2A, the same structural components will not be described here. The structural difference is that the bottom of the dispenser 607 in the generator 620 shown in FIG. 6 is obliquely disposed along the longitudinal direction of the generator 620, with the bottom of the dispenser 607 having an inclination angle β along the longitudinal direction. By obliquely disposing the bottom of the dispenser 607, the intermediate concentration solution can be uniformly distributed on the outer surface of the falling film heat exchange tube bank, thereby achieving a higher heat exchange effect. In one embodiment of the present application, the inclination angle β of the bottom of the dispenser 607 is within 5°.

[0059] FIG. 7 shows a fifth embodiment of the generator shown in FIGS. 1A-1B, from the same viewing angle as the generator in FIG. 2A.

[0060] 7 is similar to the structure of generator 120 in FIG. 2A, so a description of the same structures will be omitted here. A structural difference is that generator 720 shown in FIG. 7 has two solution inlets 754, 755 for inputting the upper solution. The two solution inlets 754, 755 penetrate housing wall 322 from both ends of the upper portion of housing accommodating cavity 303 to enter housing accommodating cavity 303. Accordingly, weir 752 is positioned between solution inlets 754, 755. For example, weir 752 may be positioned at the midpoint of the connecting line between solution inlets 754, 755.

[0061] By disposing the solution inlets 754, 755 at both ends of the top of the housing receiving cavity 303 and the weir 752 at an intermediate position as shown in FIG. 7, the intermediate concentration solution may enter the intermediate position of the dispenser 307 and thereby be evenly distributed on the outer surface of the falling film heat exchange tube.

[0062] Figure 8A shows a sixth embodiment of the generator shown in Figures 1A-1B from the same viewing angle as the generator in Figure 3A. Figure 8B shows a partial enlarged axial view of a bank 884 of finned falling film heat exchanger tubes shown in Figure 8A. Figure 8C shows a partial enlarged radial view of a bank 884 of finned falling film heat exchanger tubes shown in Figure 8A.

[0063] Since the structure of the generator 820 shown in FIG. 8A is similar to that of the generator 120 in FIG. 3A, the same structural components will not be described here. The structural difference is that the falling film heat exchange tube bank 884 in the generator 820 shown in FIG. 8A employs heat exchange tubes with fins, thereby improving the heat exchange coefficient of the falling film heat exchange tube bank 884. A partial enlarged axial view of the falling film heat exchange tube bank 884 with fins 890 is shown in FIG. 8B. A partial enlarged radial view of the falling film heat exchange tube bank 884 with fins 890 is shown in FIG. 8C. As shown in FIGS. 8B and 8C, several fins 890 are distributed on the outer side of the tube wall of the falling film heat exchange tube bank 884, thereby increasing the contact area between the falling film heat exchange tube bank 884 and the intermediate concentration solution 390 to be concentrated, thereby improving the heat exchange coefficient of the falling film heat exchange tube bank 884.

[0064] Similarly, the falling film heat exchange tube bank can be further roughened to further improve the heat exchange coefficient of the falling film heat exchange tube bank.

[0065] Hereinafter, a specific operation process of the generator of the present invention for concentrating a dilute solution will be described with reference to FIGS. 3A to 8C.

[0066] The dilute solution to be concentrated enters the flooded heat exchange tube bank 382 in the upper receiving cavity portion 304 through the solution inlet 186 and is heated by the high temperature steam within the flooded heat exchange tube bank 382. The dilute solution is initially concentrated to an intermediate strength solution while simultaneously producing refrigerant vapor.

[0067] The initially concentrated intermediate concentration solution flows from weir 252 into solution inlet passage 256, passes through solution inlet passage 256, and flows into dispenser 307 in middle cavity portion 306 via dispenser inlet hole 254. Dispenser 307 distributes intermediate concentration solution 390 onto the outer walls of falling film heat exchange tube bank 384 in lower cavity portion 308, forming a liquid film on the outer walls. The liquid film is heated by the condensed water heat source in falling film heat exchange tube bank 384 in film form on the outer walls of falling film heat exchange tube bank 384, thereby concentrating the intermediate concentration solution into a concentrated solution and simultaneously producing refrigerant vapor.

[0068] The refrigerant vapor produced in lower accommodating cavity portion 308 flows upward (as indicated by arrow 394) through refrigerant vapor passages 332 and 334, merges (as indicated by arrow 396) with the refrigerant vapor produced in upper accommodating cavity portion 304 (as indicated by arrow 392), and is ultimately discharged through refrigerant vapor outlet 188 located at the top of generator 120. The concentrated solution concentrated in lower accommodating cavity portion 308 flows out through solution outlet 187 located at the bottom of housing accommodating cavity 303 (see the description of FIG. 2A above). At this point, generator 120 completes the concentration of the dilute solution.

[0069] FIG. 9 is a block diagram of the controller 508 in the generator 520 shown in FIG. 5, illustrating specific components and connections of the controller 508.

[0070] 9, the controller 508 includes a bus 902, a processor 904, a memory 906, an input interface 908, and an output interface 910. The processor 904, the memory 906, the input interface 908, and the output interface 910 are connected to the bus 902. The processor 904 may read a program (or instruction) from the memory 906 and execute the program (or instruction) to process data. The processor 904 may also write data or a program (or instruction) to the memory 906. The memory 906 may store a program (instruction) or data. By executing the instructions in the memory 906, the processor 904 may control the memory 906, the input interface 908, and the output interface 910. In the present application, the controller 508 stores input parameters of each sensor shown in FIG. 5 and controls the opening and closing of the liquid refill valve 504 according to the received input parameters.

[0071] The input interface 908 is configured to receive sensor parameters provided by the liquid level sensor 512 or the shell pass pressure sensor 514 and the solution outlet temperature sensor 516 via connection lines 522, 524, 526, respectively, and convert the data of these parameters into signals recognizable by the processor 904 and store them in the memory 906.

[0072] The processor 904 is configured to generate opening and closing parameters for controlling the liquid refill valve 504 in response to the sensor parameters stored in the memory 906. In one embodiment, the sensor parameters provided by the liquid level sensor 512, the shell pass pressure sensor 514, and the solution outlet temperature sensor 516 may be stored in the memory 906, and the processor 904 can retrieve the parameters from the memory 906 and generate the opening and closing parameters for controlling the liquid refill valve 504.

[0073] The output interface 910 is configured to receive opening and closing parameters for the liquid refill valve 504 from the processor 904 and convert the parameters into a control signal for the liquid refill valve 504. The liquid refill valve 504 receives the executable control signal from the output interface 910 via a connecting line 532, thereby controlling the opening and closing of the liquid refill valve 504.

[0074] The air conditioning control system of the present application includes, but is not limited to, the following advanced technical effects:

[0075] First, compared with the flooded generator, the generator provided by the present application is provided with a flooded heat exchange tube group in the upper accommodating cavity portion in a accommodating cavity layered manner, which reduces the solution filling amount in the upper accommodating cavity portion, thereby lowering the boiling point of the upper solution and reducing the adverse effect of too high solution static pressure on heat transfer efficiency.

[0076] Second, compared with the all-falling film type generator, the generator provided by the present application has falling film type heat exchange tubes in the lower accommodating cavity part so as to be away from the high-temperature steam heat source in the upper accommodating cavity part, thereby effectively preventing crystallization on the outer wall of the falling film type heat exchange tubes and improving the stability of the generator.

[0077] Third, the present application further improves the heat exchange efficiency of the generator by providing different arrangements of the generator in the embodiments (second embodiment to sixth embodiment) shown in FIGS. 4 to 8C.

[0078] While the present application has been described in combination with exemplary embodiments of the summary above, various alternatives, modifications, variations, improvements, and / or substantially equivalents, whether known or currently or foreseeable in the near future, may be apparent to those skilled in the art. Furthermore, the technical effects and / or technical problems described herein are exemplary rather than limiting. Thus, the disclosure of the present application may be used to solve other technical problems and achieve other technical effects and / or solve other technical problems. Accordingly, the exemplary embodiments of the present application as described above are exemplary rather than limiting. Various changes are possible without departing from the spirit or scope of the present application. Therefore, the present application is intended to embrace all known or previously developed alternatives, modifications, variations, improvements, and / or substantially equivalents.

Claims

1. a housing (200) and a housing receiving cavity (303) defined by the housing (200); The housing receiving cavity (303) includes an upper receiving cavity portion (304), an intermediate receiving cavity portion (306), and a lower receiving cavity portion (308), and the intermediate receiving cavity portion (306) is disposed between the upper receiving cavity portion (304) and the lower receiving cavity portion (308); a first group of heat exchange tubes (382) disposed within the upper receiving cavity portion (304), an upper solution being received in the upper receiving cavity portion (304), and the first group of heat exchange tubes (382) being at least partially immersed in the upper solution; At least one second row of heat exchange tubes (384) is disposed within the lower receiving cavity portion (308); a dispenser (307) disposed within the intermediate cavity portion (306), the dispenser (307) receiving the upper solution from the upper cavity portion (304) and distributing the upper solution ejected from the upper cavity portion (304) onto the second group of heat exchange tubes (384).

2. 2. The generator of claim 1, wherein said upper receiving cavity portion (304) further comprises a container (360) for receiving said upper solution.

3. 2. The generator of claim 1, wherein a solution introduction passage (256) is further provided in the housing receiving cavity (303), the solution introduction passage (256) introducing the upper solution into the dispenser (307).

4. 4. The generator of claim 3, wherein the upper receiving cavity portion (304) is further provided with a weir (252), the weir (252) defining a fluid inlet for the solution introduction passage (256).

5. 5. The generator of claim 4, wherein the first group of heat exchange tubes (382) is completely immersed in the upper solution, and the height of the weir (252) is set to a position above the top of the first group of heat exchange tubes (382).

6. The generator comprises: a fluid inlet (182) in fluid communication with the first group of heat exchange tubes (382) and configured to input a fluid heat source into the first group of heat exchange tubes (382); 2. The generator of claim 1, further comprising: a fluid heat source that heats the upper solution while flowing through the first group of heat exchange tubes (382) and then flows into the second group of heat exchange tubes (384) to continue to heat a lower solution that is distributed onto the second group of heat exchange tubes (384), the fluid heat source heating the lower solution that is then discharged through the fluid outlet (184).

7. 2. The generator of claim 1, wherein a distribution passage (314) is provided in the dispenser (307), and the distribution passage (314) distributes the solution introduced from the upper accommodating cavity portion (304) onto the second group of heat exchange tubes (384).

8. The generator of claim 7, wherein the distribution passage (314) is a through hole (316).

9. 2. The generator of claim 1, wherein an inner diameter of heat exchange tubes on both sides of said second group of heat exchange tubes is smaller than an inner diameter of heat exchange tubes in a center portion of said second group of heat exchange tubes.

10. The housing receiving cavity (303) comprises:

10. The generator of claim 1, further comprising a solution replenishment inlet (502), said solution replenishment inlet (502) configured to replenish said dispenser (307) with solution.

11. 2. The generator of claim 1, wherein a bottom of the dispenser (607) is disposed obliquely along a longitudinal direction of the generator such that the bottom of the dispenser (607) has an inclination angle (β) along the longitudinal direction of the generator.

12. 12. The generator of claim 11, wherein the angle of inclination (β) at the bottom of the dispenser (607) is no greater than 5°.

13. 2. The generator of claim 1, wherein a through hole is provided in a bottom of the upper accommodating cavity portion (304), thereby forming the dispenser (307).

14. The housing (200) further includes a housing wall (322); the generator further comprises two solution inlets (754, 755); 5. The generator of claim 4, wherein the two solution inlets (754, 755) are configured to input the upper solution, the two solution inlets (754, 755) respectively penetrating from opposite ends of the upper portion of the housing accommodating cavity (303) through the housing wall (322) into the housing accommodating cavity (303), and the weir (752) is positioned at a position between the two solution inlets (754, 755).

15. The generator of claim 1, wherein fins (890) are provided on the second group of heat exchange tubes (884) or the surface of the second group of heat exchange tubes (384) is roughened.

16. An air conditioning system (100) comprising a generator according to any one of claims 1 to 15.

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