Lithium bromide refrigerating unit

Abstract

The invention provides a lithium bromide refrigerating unit. The lithium bromide refrigerating unit comprises a heat source pipeline, a high-temperature bypass pipeline, a bypass adjusting device and a control device. The heat source pipeline passes through the high-temperature generator, the low-temperature generator and the auxiliary generator in sequence, and the heat source pipeline is configured to receive heat source fluid. One end of the high-temperature bypass pipeline is connected to an outlet of the high-temperature generator or an outlet of the low-temperature generator, and the other end of the high-temperature bypass pipeline is connected to an outlet of the heat source pipeline, so that the flow of heat source fluid flowing through the low-temperature generator and the auxiliary generator is reduced. The bypass adjusting device is arranged on the high-temperature bypass pipeline so as to adjust the flow of the heat source fluid flowing out of the high-temperature generator and then flowing through the low-temperature generator and / or the auxiliary generator. The control device is configured to adjust the opening degree of the bypass adjusting device according to the unit load of the lithium bromide refrigerating unit. According to the lithium bromide refrigerating unit, the high refrigerating COP can be kept when the unit load of the lithium bromide refrigerating unit is smaller than the ideal load.

Description

Technical Field

[0001] This application relates to the field of lithium bromide refrigeration units. Background Art

[0002] Lithium bromide chillers provide cooling to users by capturing heat from a heat source. When the cooling demand at the user's side decreases, the lithium bromide chiller reduces the flow of heat to the heat source, thereby reducing the cooling capacity supplied to the user. However, this reduces the COP of the lithium bromide chiller. Summary of the Invention

[0003] Exemplary embodiments of this application can solve at least some of the above-mentioned problems.

[0004] This application provides a lithium bromide refrigeration unit, comprising a high-temperature generator, a low-temperature generator, an auxiliary generator, a heat source pipeline, a high-temperature bypass pipeline, a bypass regulating device, and a control device. The heat source pipeline sequentially passes through the high-temperature generator, the low-temperature generator, and the auxiliary generator, and is configured to receive heat source fluid, such that the heat source fluid sequentially flows through the high-temperature generator, the low-temperature generator, and the auxiliary generator. One end of the high-temperature bypass pipeline is connected to the outlet of the high-temperature generator or the outlet of the low-temperature generator, and the other end of the high-temperature bypass pipeline is connected to the outlet of the heat source pipeline, thereby reducing the flow rate of the heat source fluid through the low-temperature generator and the auxiliary generator. The bypass regulating device is disposed on the high-temperature bypass pipeline to regulate the flow rate of the heat source fluid flowing from the high-temperature generator through the low-temperature generator and / or the auxiliary generator. The control device is communicatively connected to the bypass regulating device and is configured to adjust the opening degree of the bypass regulating device according to the unit load of the lithium bromide refrigeration unit.

[0005] According to the lithium bromide refrigeration unit, the lithium bromide refrigeration unit further includes a heat source regulating device, which is disposed on the heat source pipeline and configured to regulate the flow rate of the heat source fluid entering the high-temperature generator. The control device is communicatively connected to the heat source regulating device and is configured to adjust the opening degree of the heat source regulating device according to the unit load.

[0006] According to the lithium bromide chiller unit, the unit load is based on the unit inlet temperature and the unit outlet temperature of the lithium bromide chiller unit. The unit load includes the chilled water temperature difference and the unit load ratio. The chilled water temperature difference is the difference between the unit inlet temperature and the unit outlet temperature, and the unit load ratio is the ratio of the chilled water temperature difference to a preset chilled water temperature difference. The control device is configured to: when the chilled water temperature difference of the lithium bromide chiller unit is greater than or equal to the preset chilled water temperature difference, the control device adjusts the opening degree of the heat source regulating device to a first heat source opening degree and adjusts the opening degree of the bypass regulating device to a second bypass opening degree.

[0007] According to the lithium bromide chiller unit, the control device is configured to: when the chilled water temperature difference of the lithium bromide chiller unit is less than a preset chilled water temperature difference and the unit load ratio is less than a preset load ratio, the control device adjusts the opening degree of the bypass regulating device to a first bypass opening degree. The second bypass opening degree is less than the first bypass opening degree.

[0008] According to the lithium bromide refrigeration unit, the control device is configured to: when the opening degree of the bypass regulating device is the first bypass opening degree and the outlet temperature of the lithium bromide refrigeration unit is less than the preset outlet temperature, the control device reduces the opening degree of the heat source regulating device.

[0009] According to the lithium bromide refrigeration unit, the control device is configured to: when the opening degree of the bypass regulating device is the first bypass opening degree and the outlet temperature of the lithium bromide refrigeration unit is greater than the preset outlet temperature, the control device increases the opening degree of the heat source regulating device.

[0010] According to the lithium bromide chiller unit, the control device is configured to: when the chilled water temperature difference of the lithium bromide chiller unit is less than the preset chilled water temperature difference, the unit load ratio is greater than the preset load ratio, and the outlet temperature of the lithium bromide chiller unit is less than the preset outlet temperature, the control device increases the opening of the bypass regulating device.

[0011] The control device is configured to reduce the opening of the bypass regulating device when the chilled water temperature difference of the lithium bromide chiller is less than the preset chilled water temperature difference, the load ratio of the unit is greater than the preset load ratio, and the outlet temperature of the lithium bromide chiller is greater than the preset outlet temperature.

[0012] According to the lithium bromide refrigeration unit, the lithium bromide refrigeration unit further includes an absorber, a solution pipeline, and a solution pipeline regulating device. The solution pipeline connects the absorber and the cryogenic generator and is configured to allow the solution in the absorber to enter the cryogenic generator. The solution pipeline regulating device is disposed on the solution pipeline and is configured to regulate the flow rate of the solution entering the cryogenic generator.

[0013] According to the lithium bromide chiller unit, the control device is configured to adjust the opening of the solution pipeline regulating device based on the chilled water temperature difference, the unit load ratio, and the outlet temperature of the lithium bromide chiller unit.

[0014] According to the lithium bromide refrigeration unit, the control device is configured to: when the chilled water temperature difference of the lithium bromide refrigeration unit is greater than or equal to a preset chilled water temperature difference, the control device adjusts the opening of the solution pipeline regulating device to a first solution opening. The control device is also configured to: when the chilled water temperature difference of the lithium bromide refrigeration unit is less than a preset chilled water temperature difference and the unit load ratio is less than a preset load ratio, the control device adjusts the opening of the solution pipeline regulating device to a second solution opening. The second solution opening is less than the first solution opening.

[0015] According to the lithium bromide chiller unit, the control device is configured to: decrease the opening of the solution pipeline regulating device when the chilled water temperature difference of the lithium bromide chiller unit is less than a preset chilled water temperature difference, the unit load ratio is greater than a preset load ratio, and the outlet temperature of the lithium bromide chiller unit is less than a preset outlet temperature. The control device is also configured to: increase the opening of the solution pipeline regulating device when the chilled water temperature difference of the lithium bromide chiller unit is less than a preset chilled water temperature difference, the unit load ratio is greater than a preset load ratio, and the outlet temperature of the lithium bromide chiller unit is greater than a preset outlet temperature.

[0016] According to the lithium bromide refrigeration unit, the control device is configured to adjust the opening of the solution pipeline regulating device according to the chilled water temperature difference, the unit load ratio, and the solution outlet concentration of the low-temperature generator.

[0017] According to the lithium bromide refrigeration unit, the control device is configured to: when the chilled water temperature difference of the lithium bromide refrigeration unit is greater than or equal to a preset chilled water temperature difference, the control device adjusts the opening of the solution pipeline regulating device to a first solution opening. The control device is also configured to: when the chilled water temperature difference of the lithium bromide refrigeration unit is less than a preset chilled water temperature difference and the unit load ratio is less than a preset load ratio, the control device adjusts the opening of the solution pipeline regulating device to a second solution opening. The second solution opening is less than the first solution opening.

[0018] According to the lithium bromide refrigeration unit, the control device is configured to: decrease the opening of the solution pipeline regulating device when the chilled water temperature difference of the lithium bromide refrigeration unit is less than a preset chilled water temperature difference, the unit load ratio is greater than a preset load ratio, and the solution outlet concentration of the low-temperature generator is less than a preset solution outlet concentration. Alternatively, the control device is configured to: increase the opening of the solution pipeline regulating device when the chilled water temperature difference of the lithium bromide refrigeration unit is less than a preset chilled water temperature difference, the unit load ratio is greater than a preset load ratio, and the solution outlet concentration of the low-temperature generator is greater than a preset solution outlet concentration.

[0019] According to the lithium bromide chiller unit, the lithium bromide chiller unit further includes a unit inlet temperature detection device and a unit outlet temperature detection device. The unit inlet temperature detection device is configured to detect the temperature of the liquid entering the lithium bromide chiller unit. The unit outlet temperature detection device is configured to detect the temperature of the liquid leaving the lithium bromide chiller unit. The control device is communicatively connected to the unit inlet temperature detection device and the unit outlet temperature detection device, and is configured to calculate the unit load ratio based on the temperature of the liquid entering the lithium bromide chiller unit and the temperature of the liquid leaving the lithium bromide chiller unit.

[0020] According to the lithium bromide refrigeration unit, the lithium bromide refrigeration unit further includes a concentration detection device configured to detect the concentration of the solution leaving the cryogenic generator and communicatively connected to the control device.

[0021] The lithium bromide refrigeration unit of this application can maintain a high cooling COP when the unit load of the lithium bromide refrigeration unit is less than the ideal load. Attached Figure Description

[0022] The features and advantages of this application can be better understood by reading the following detailed description with reference to the accompanying drawings, in which the same reference numerals denote the same parts, wherein:

[0023] Figure 1 This is a system diagram of the lithium bromide refrigeration unit according to the first embodiment of this application;

[0024] Figure 2 yes Figure 1 The control system diagram of the lithium bromide refrigeration unit is shown below;

[0025] Figure 3 yes Figure 2 A schematic internal structure diagram of the control device shown;

[0026] Figure 4 It is used for control Figure 1The control flow chart of the lithium bromide refrigeration unit is shown below;

[0027] Figure 5 yes Figure 4 The detailed control flow chart for step 414 is shown below;

[0028] Figure 6 This is a system diagram and a control system diagram of the lithium bromide refrigeration unit according to the second embodiment of this application;

[0029] Figure 7 It is used for control Figure 6 The control flow chart of the lithium bromide refrigeration unit is shown below;

[0030] Figure 8 yes Figure 7 The detailed control flow chart for step 714 is shown below;

[0031] Figure 9 The present invention relates to a system diagram and a control system diagram of a lithium bromide refrigeration unit according to a third embodiment of the present application. Detailed Implementation

[0032] Various specific embodiments of this application will now be described with reference to the accompanying drawings, which form part of this specification. It should be understood that in the following drawings, the same components are referred to by the same reference numerals.

[0033] Various specific embodiments of this application will now be described with reference to the accompanying drawings, which form part of this specification. It should be understood that although terms indicating direction, such as "upper," "lower," "left," "right," "inner," and "outer," are used herein to describe various exemplary structural portions and elements, their use is merely for illustrative purposes and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed herein can be arranged in different orientations, these terms indicating direction are illustrative only and should not be considered limiting.

[0034] Figure 1 This is a system diagram of the lithium bromide refrigeration unit according to the first embodiment of this application. Figure 1As shown, the lithium bromide refrigeration unit includes a high-temperature generator 101, a low-temperature generator 102, an auxiliary generator 103, an absorber 104, an auxiliary absorber 105, a condenser 106, and an evaporator 109. The high-temperature generator 101, low-temperature generator 102, and auxiliary generator 103 are configured to receive a heat source to heat a dilute lithium bromide solution to generate steam and a concentrated lithium bromide solution. The absorber 104 and auxiliary absorber 105 are configured to receive the concentrated lithium bromide solution and liquid water, thereby converting the concentrated lithium bromide solution into a dilute lithium bromide solution. The condenser 106 is configured to receive steam and convert the steam into liquid water. The evaporator 109 is configured to receive liquid water, convert the liquid water into steam, and provide cooling capacity to the user. The lithium bromide refrigeration unit also includes multiple pipelines, such as a heat source pipeline 110. The above components are connected through these multiple pipelines to form a refrigeration system, which will be combined with... Figure 1 A detailed introduction follows:

[0035] like Figure 1 As shown, the heat source pipeline 110 sequentially passes through a high-temperature generator 101, a low-temperature generator 102, and an auxiliary generator 103, and is configured to receive the heat source fluid, thereby allowing the heat source fluid to sequentially pass through the high-temperature generator 101, the low-temperature generator 102, and the auxiliary generator 103. A first pipeline 131 connects the high-temperature generator 101 and the absorber 104, and is configured to allow the concentrated lithium bromide solution in the high-temperature generator 101 to enter the absorber 104. A second pipeline 132 connects the low-temperature generator 102 and the absorber 104, and is configured to allow the concentrated lithium bromide solution in the low-temperature generator 102 to enter the absorber 104. A third pipeline 133 connects the absorber 104 and the high-temperature generator 101, and is configured to allow the dilute lithium bromide solution in the absorber 104 to enter the high-temperature generator 101. Solution line 111 connects absorber 104 and cryogenic generator 102, and is configured to allow the dilute lithium bromide solution in absorber 104 to enter cryogenic generator 102. High-temperature generator 101 and auxiliary generator 103 are both connected to condenser 106, allowing vapor from high-temperature generator 101 and auxiliary generator 103 to enter condenser 106. Fourth line 134 connects evaporator 109 and high-temperature generator 101, and is configured to allow liquid water from condenser 106 to enter evaporator 109. Evaporator 109 is connected to absorber 104, allowing vapor from evaporator 109 to enter absorber 104. Cryogenic generator 102 is connected to auxiliary absorber 105, allowing vapor from cryogenic generator 102 to enter auxiliary absorber 105. Fifth line 135 connects auxiliary generator 103 and auxiliary absorber 105, and is configured to allow concentrated lithium bromide solution from auxiliary generator 103 to enter auxiliary absorber 105. The sixth conduit 136 connects the auxiliary generator 103 and the auxiliary absorber 105, and is configured to allow the dilute lithium bromide solution in the auxiliary absorber 105 to enter the auxiliary generator 103.

[0036] like Figure 1 As shown, the lithium bromide refrigeration unit also includes a heat source regulating device 121. The heat source regulating device 121 is disposed on the heat source pipeline 110 and configured to regulate the flow rate of the heat source fluid entering the high-temperature generator 101. In other words, the heat source regulating device 121 is configured to regulate the flow rate of the heat source fluid entering the lithium bromide refrigeration unit.

[0037] like Figure 1 As shown, the lithium bromide refrigeration unit also includes a high-temperature bypass pipe 112 and a bypass regulating device 122. One end of the high-temperature bypass pipe 112 is connected to the outlet of the high-temperature generator 101, and the other end is connected to the outlet of the heat source pipe 110, so that a portion of the heat source fluid flowing out of the high-temperature generator 101 passes through the high-temperature bypass pipe 112 instead of the low-temperature generator 102 and the auxiliary generator 103. In other words, the high-temperature bypass pipe 112 can reduce the flow rate of the heat source fluid entering the lithium bromide refrigeration unit through the low-temperature generator 102 and the auxiliary generator 103. The bypass regulating device 122 is provided on the high-temperature bypass pipe 112 to regulate the flow rate of the heat source fluid flowing out of the high-temperature generator 101 and then through the low-temperature generator 102 and the auxiliary generator 103.

[0038] like Figure 1 As shown, the lithium bromide refrigeration unit also includes a solution line regulating device 123. The solution line regulating device 123 is disposed on the solution line 111 and is configured to regulate the flow rate of the dilute lithium bromide solution entering the low-temperature generator 102.

[0039] like Figure 1 As shown, the lithium bromide refrigeration unit also includes a user-side piping 141. At least a portion of the user-side piping 141 is disposed in the evaporator 109 and configured to exchange heat with the liquid water in the evaporator 109. The liquid (e.g., a refrigerant) in the user-side piping 141 is capable of exchanging heat with the liquid water in the evaporator 109 and flows out of the evaporator 109 after its temperature decreases.

[0040] Figure 2 yes Figure 1 The control system diagram of the lithium bromide refrigeration unit is shown below. Figure 2 As shown, the lithium bromide refrigeration unit also includes a control device 202. The control device 202 is communicatively connected to the heat source regulating device 121, the bypass regulating device 122, and the solution pipeline regulating device 123, and is configured to control the opening degree of the heat source regulating device 121, the bypass regulating device 122, and the solution pipeline regulating device 123. Specifically, the control device 202 is configured to adjust the opening degree of the heat source regulating device 121, the bypass regulating device 122, and the solution pipeline regulating device 123 according to the unit load of the lithium bromide refrigeration unit.

[0041] like Figure 2 As shown, the lithium bromide chiller unit also includes a unit inlet temperature detection device 211 and a unit outlet temperature detection device 212. The unit inlet temperature detection device 211 is installed on the user-side pipeline 141 and configured to detect the unit inlet temperature Ti of the lithium bromide chiller unit (i.e., the temperature of the liquid entering the lithium bromide chiller unit). The unit outlet temperature detection device 212 is installed on the user-side pipeline 141 and configured to detect the unit outlet temperature To of the lithium bromide chiller unit (i.e., the temperature of the liquid leaving the lithium bromide chiller unit). The control device 202 is communicatively connected to both the unit inlet temperature detection device 211 and the unit outlet temperature detection device 212, and is configured to acquire the unit inlet temperature Ti and the unit outlet temperature To. In this application, the unit load is based on the unit inlet temperature Ti and the unit outlet temperature To of the lithium bromide chiller unit. As an embodiment, the unit load includes the current chilled water temperature difference ΔT of the lithium bromide chiller unit and the current unit load ratio SCHWT of the lithium bromide chiller unit. Specifically, the control device 202 is configured to calculate the chilled water temperature difference ΔT and the unit load ratio SCHWT of the lithium bromide chiller based on the current unit inlet temperature Ti and unit outlet temperature To. Wherein, the chilled water temperature difference ΔT of the lithium bromide chiller = Ti - To. The unit load ratio SCHWT is the ratio of the current chilled water temperature difference ΔT to the preset chilled water temperature difference ΔTs.

[0042] like Figure 2 As shown, the control device 202 is configured to: when the current chilled water temperature difference ΔT is greater than or equal to the preset chilled water temperature difference ΔTs, adjust the opening of the heat source regulating device 121 to the first heat source opening, adjust the opening of the bypass regulating device 122 to the second bypass opening, and adjust the opening of the solution pipeline regulating device 123 to the first solution opening. The control device 202 is also configured to: when the current chilled water temperature difference ΔT is less than the preset chilled water temperature difference ΔTs, and the current unit load ratio SCHWT is less than the preset load ratio SCHWTs, adjust the opening of the bypass regulating device 122 to the first bypass opening, and adjust the opening of the solution pipeline regulating device 123 to the second solution opening. The second solution opening is less than the first solution opening. The second bypass opening is less than the first bypass opening. In this application, the first bypass opening is fully open, and the second bypass opening is fully closed. The first solution opening is fully open, and the second solution opening is fully closed.

[0043] like Figure 2As shown, control device 202 is configured to: decrease the opening of heat source regulating device 121 when the opening degree of bypass regulating device 122 is the first bypass opening degree and the outlet temperature To of lithium bromide chiller is less than the preset outlet temperature Tos. Control device 202 is also configured to: increase the opening degree of heat source regulating device 121 when the opening degree of bypass regulating device 122 is the first bypass opening degree and the outlet temperature To of lithium bromide chiller is greater than the preset outlet temperature Tos.

[0044] like Figure 2 As shown, the control device 202 is configured to: when the chilled water temperature difference ΔT of the lithium bromide chiller is less than the preset chilled water temperature difference ΔTo, the unit load ratio SCHWT is greater than the preset load ratio SCHWTs, and the outlet temperature To of the lithium bromide chiller is less than the preset outlet temperature Tos, the control device 202 increases the opening of the bypass regulating device 122 and decreases the opening of the solution pipeline regulating device 123. The control device 202 is configured to: when the chilled water temperature difference ΔT of the lithium bromide chiller is less than the preset chilled water temperature difference ΔTo, the unit load ratio SCHWT is greater than the preset load ratio SCHWTs, and the outlet temperature To of the lithium bromide chiller is greater than the preset outlet temperature Tos, the control device 202 decreases the opening of the bypass regulating device 122 and increases the opening of the solution pipeline regulating device 123.

[0045] It should be noted that, although in this application the first opening degree (e.g., the first opening degree of the heat source, the first opening degree of the bypass, and the first opening degree of the solution) is fully open and the second opening degree (e.g., the second opening degree of the bypass and the second opening degree of the solution) is fully closed, in other embodiments, the first opening degree can be greater than the second opening degree.

[0046] Figure 3 yes Figure 2 A schematic internal structure diagram of the control device 202 shown. Figure 3As shown, the control device 202 includes a bus 341, a processor 342, an input device 343, an output device 344, and a memory 345 containing a control program 346. Each component of the control device 202, including the processor 342, input device 343, output device 344, and memory 345, is communicatively connected to the bus 341, enabling the processor 342 to control the operation of the input device 343, output device 344, and memory 345. Specifically, the memory 345 stores programs, instructions, and data. The processor 342 reads programs, instructions, and data from the memory 345 and can write data to the memory 345. By executing the programs and instructions read from the memory 345, the processor 342 controls the operation of the input device 343 and the output device 344. The input device 343 receives external signals and data via lines 321 and 322, including the temperature of the liquid entering the lithium bromide chiller detected by the unit inlet temperature detection device 211 and the temperature of the liquid leaving the lithium bromide chiller detected by the unit outlet temperature detection device 212. The output device 344 sends control signals to the heat source regulating device 121, the bypass regulating device 122, and the solution pipeline regulating device 123 via lines 331 and 332, respectively, thereby controlling the opening degree of the heat source regulating device 121, the bypass regulating device 122, and the solution pipeline regulating device 123.

[0047] In the embodiments of this application, the implementation is as follows: Figures 4-5 The program in the flowchart shown is stored in the memory 345 of the control device 202. The control device 202 controls the refrigeration system by executing the program stored in the control device 202 via the processor 342. The memory 345 also stores: a preset chilled water temperature difference ΔTs and a preset unit load ratio SCHWTs. For example, the preset chilled water temperature difference ΔTs is 4°C, and the preset unit load ratio SCHWTs is 70%. Furthermore, in... Figure 2 The specific values ​​detected by the unit inlet temperature detection device 211 and the unit outlet temperature detection device 212 are also stored in the memory 345.

[0048] Figure 4 It is used for control Figure 1 and Figure 2 The control flow diagram of the lithium bromide refrigeration unit is shown below. Figure 4 As shown, when the lithium bromide refrigeration unit is started, the processor 342 will transfer the operation to step 402.

[0049] In step 402, processor 342 adjusts heat source regulating device 121 to the first heat source opening, adjusts solution pipeline regulating device 123 to the first solution opening, and adjusts bypass regulating device 122 to the second bypass opening. At this time, processor 342 considers the unit load of the lithium bromide refrigeration unit to be the ideal unit load (i.e., the lithium bromide refrigeration unit has reached ideal operating conditions). The heat source fluid will pass through heat source regulating device 121 at an ideal flow rate, sequentially passing through high-temperature generator 101, low-temperature generator 102, and auxiliary generator 103. The ideal flow rate of dilute lithium bromide solution enters low-temperature generator 102 through solution pipeline regulating device 123. Subsequently, processor 342 proceeds to step 404.

[0050] In step 404, processor 342 obtains the temperature of the liquid entering the lithium bromide chiller (i.e., the current inlet temperature Ti) from unit inlet temperature detection device 211, and obtains the temperature of the liquid leaving the lithium bromide chiller (i.e., the current outlet temperature To) from unit outlet temperature detection device 212. Then, processor 342 proceeds to step 406.

[0051] In step 406, processor 342 calculates the current cold water temperature difference ΔT. Specifically, the cold water temperature difference ΔT = Ti - To. Then, processor 342 proceeds to step 408.

[0052] In step 408, processor 342 determines whether the current chilled water temperature difference ΔT is less than the preset chilled water temperature difference ΔTs. If the current chilled water temperature difference ΔT is greater than or equal to the preset chilled water temperature difference ΔTs, it indicates that the current unit load is close to the preset unit load, and the lithium bromide chiller unit can operate under ideal conditions. Subsequently, processor 342 transfers the operation to step 402. In other words, when the current chilled water temperature difference ΔT is greater than or equal to the preset chilled water temperature difference ΔTs, processor 342 adjusts the heat source regulating device 121 to the first heat source opening, adjusts the solution pipeline regulating device 123 to the first solution opening, and adjusts the bypass regulating device 122 to the second bypass opening. If processor 342 determines that the current chilled water temperature difference is less than the preset chilled water temperature difference, processor 342 transfers the operation to step 412.

[0053] In step 412, processor 342 calculates the current unit load ratio SCHWT based on the current unit inlet temperature Ti and the current unit outlet temperature To. Then, processor 342 proceeds to step 414.

[0054] In step 414, processor 342 adjusts the opening of heat source regulating device 121, bypass regulating device 122, and solution pipeline regulating device 123 according to the current unit load ratio SCHWT and the current unit outlet temperature To of the lithium bromide chiller. Then, processor 342 proceeds to step 402.

[0055] Figure 5 yes Figure 4 The detailed control flowchart for step 414 is shown below. Figure 5 As shown, in step 502, processor 342 determines whether the current unit load ratio SCHWT is less than the preset load ratio SCHWTs. If processor 342 determines that the current unit load ratio SCHWT is greater than or equal to the preset load ratio SCHWTs, processor 342 proceeds to step 512. If processor 342 determines that the current unit load ratio SCHWT is less than the preset load ratio SCHWTs, then processor 342 determines that the current unit load is too low compared to the ideal unit load, and the flow rate of the heat source fluid entering the cryogenic generator 102 and the auxiliary generator 103 should be minimized. Subsequently, processor 342 proceeds to step 504.

[0056] In step 504, processor 342 adjusts the opening of bypass regulating device 122 to bypass first opening, thereby minimizing the flow rate of heat source fluid entering cryogenic generator 102 and auxiliary generator 103, and processor 342 adjusts the opening of solution pipeline regulating device 123 to solution second opening, in order to minimize the flow rate of lithium bromide dilute solution entering cryogenic generator 102. Then, processor 342 proceeds to step 506.

[0057] In step 506, processor 342 determines whether the current outlet temperature To of the lithium bromide chiller is lower than the preset outlet temperature Tos. If processor 342 determines that the current outlet temperature To of the lithium bromide chiller is lower than the preset outlet temperature Tos, processor 342 proceeds to step 508.

[0058] In step 508, processor 342 reduces the opening of heat source regulating device 121 to decrease the flow rate of heat source fluid entering the lithium bromide refrigeration unit. As an example, processor 342 reduces the opening of heat source regulating device 121 by 1%. Then, processor 342 proceeds to step 402.

[0059] In step 506, if the processor 342 determines that the current outlet temperature of the lithium bromide chiller is greater than or equal to the preset outlet temperature, the processor 342 will transfer the operation to step 511.

[0060] In step 511, processor 342 determines whether the current outlet temperature of the lithium bromide chiller is greater than the preset outlet temperature. If processor 342 determines that the current outlet temperature of the lithium bromide chiller is greater than the preset outlet temperature, processor 342 proceeds to step 513.

[0061] In step 513, processor 342 increases the opening of heat source regulating device 121 to increase the flow rate of heat source fluid entering the lithium bromide refrigeration unit. As an example, processor 342 increases the opening of heat source regulating device 121 by 1%. Subsequently, processor 342 proceeds to step 402.

[0062] In step 511, if the processor 342 determines that the current outlet temperature of the lithium bromide chiller is not greater than the preset outlet temperature, the processor 342 will proceed to step 402. That is, if the processor 342 determines that the current outlet temperature of the lithium bromide chiller is equal to the preset outlet temperature, the processor 342 will maintain the current opening of the heat source regulating device 121.

[0063] In step 502, if the processor 342 determines that the current unit load ratio SCHWT is greater than or equal to the preset load ratio SCHWTs, then the processor 342 determines that the current unit load is close to the ideal load, and can reduce the flow rate of the heat source fluid entering the low temperature generator 102 and the auxiliary generator 103. Subsequently, the processor 342 transfers the operation to step 512.

[0064] In step 512, processor 342 determines whether the current outlet temperature To of the lithium bromide chiller is less than the preset outlet temperature Tos. If processor 342 determines that the current outlet temperature To of the lithium bromide chiller is greater than or equal to the preset outlet temperature Tos, processor 342 proceeds to step 522. If processor 342 determines that the current outlet temperature To of the lithium bromide chiller is less than the preset outlet temperature Tos, processor 342 proceeds to step 514.

[0065] In step 514, processor 342 increases the opening of bypass regulating device 122 and decreases the opening of solution line regulating device 123 to reduce the flow rate of heat source fluid entering cryogenic generator 102 and auxiliary generator 103, and to reduce the flow rate of lithium bromide dilute solution entering cryogenic generator 102. As an example, processor 342 increases the opening of bypass regulating device 122 by 1% and decreases the opening of solution line regulating device 123 by 1%. Then, processor 342 proceeds to step 402.

[0066] In step 512, if the processor 342 determines that the current outlet temperature of the lithium bromide chiller is greater than or equal to the preset outlet temperature, the processor 342 will proceed to step 522.

[0067] In step 522, processor 342 determines whether the current outlet temperature To of the lithium bromide chiller is greater than the preset outlet temperature Tos. If processor 342 determines that the current outlet temperature To of the lithium bromide chiller is not greater than the preset outlet temperature Tos, processor 342 proceeds to step 402. That is, if processor 342 determines that the current outlet temperature To of the lithium bromide chiller is equal to the preset outlet temperature Tos, processor 342 will maintain the current opening of bypass regulating device 122 and solution pipeline regulating device 123.

[0068] In step 522, if the processor 342 determines that the current outlet temperature To of the lithium bromide chiller is greater than the preset outlet temperature Tos, the processor 342 will proceed to step 524.

[0069] In step 524, processor 342 decreases the opening of bypass regulating device 122 and increases the opening of solution pipeline regulating device 123 to increase the flow rate of the heat source fluid entering the cryogenic generator 102 and auxiliary generator 103, and to increase the flow rate of the lithium bromide dilute solution entering the cryogenic generator 102. As an example, processor 342 decreases the opening of bypass regulating device 122 by 1% and increases the opening of solution pipeline regulating device 123 by 1%. Then, processor 342 proceeds to step 402.

[0070] In existing technologies, when the load on a lithium bromide chiller is less than the ideal load, the chiller reduces the flow rate of the heat source fluid entering the chiller, thereby reducing the output cooling capacity. However, under this operating condition, the cooling COP of the lithium bromide chiller is relatively low.

[0071] This application provides a lithium bromide refrigerator unit that can maintain a high cooling COP when the unit load is less than the ideal load. Specifically, the inventors of this application have discovered that the contribution of the high-temperature generator 101 to the cooling capacity is approximately 2:1 compared to the combined contribution of the low-temperature generator 102 and the auxiliary generator 103. When the unit load of the lithium bromide refrigerator unit is less than the ideal load, adjusting the bypass regulating device 122 to reduce the flow rate of the heat source fluid flowing through the low-temperature generator 102 and the auxiliary generator 103 can reduce the cooling capacity of the low-temperature generator 102 and the auxiliary generator 103, which have a lower contribution ratio to the cooling capacity, thereby improving the cooling COP of the lithium bromide refrigerator unit.

[0072] Figure 6 This is a system diagram and control system diagram of the lithium bromide refrigeration unit according to the second embodiment of this application. Figure 6 The second embodiment of the lithium bromide refrigeration unit shown is similar to that of... Figures 1-2The first embodiment of the lithium bromide refrigeration unit shown is largely the same and will not be described again here. The main difference lies in: (e.g.) Figures 1-2 In the first embodiment of the lithium bromide refrigeration unit shown, the control device 202 controls the opening degree of the solution pipeline regulating device 123 according to the unit load ratio SCHWT, while in... Figure 6 In the second embodiment of the lithium bromide refrigeration unit shown, the control device 202 controls the opening degree of the solution pipeline regulating device 123 according to the concentration of the lithium bromide solution leaving the low-temperature generator 102.

[0073] like Figure 6 As shown, the lithium bromide refrigeration unit also includes a concentration detection device 601. The concentration detection device 601 is communicatively connected to the control device 202 and is configured to detect the concentration C (i.e., the solution outlet concentration C) of the lithium bromide solution leaving the cryogenic generator 102. In this application, the concentration detection device 601 is installed on the solution pipeline 111. The control device 202 is configured to adjust the opening of the solution pipeline regulating device 123 based on the unit inlet temperature Ti of the lithium bromide refrigeration unit, the unit outlet temperature To of the lithium bromide refrigeration unit, the unit load ratio SCHWT of the lithium bromide refrigeration unit, and the solution outlet concentration C of the cryogenic generator 102.

[0074] like Figure 6 The control device 202 shown is configured to adjust the opening of the solution pipeline regulating device 123 to the first opening degree when the chilled water temperature difference ΔT is greater than or equal to the preset chilled water temperature difference ΔTs. The control device 202 is also configured to adjust the opening of the solution pipeline regulating device 123 to the second opening degree when the chilled water temperature difference ΔT is less than the preset chilled water temperature difference ΔTs and the unit load ratio SCHWT is less than the preset load ratio.

[0075] like Figure 6 The control device 202 shown is further configured to: reduce the opening of the solution pipeline regulating device 123 when the chilled water temperature difference ΔT is less than the preset chilled water temperature difference ΔTs, the unit load ratio SCHWT is greater than the preset load ratio SCHWTs, and the solution outlet concentration C of the low-temperature generator 102 is less than the preset solution outlet concentration Cs. The control device 202 is also configured to: increase the opening of the solution pipeline regulating device 123 when the chilled water temperature difference ΔT is less than the preset chilled water temperature difference ΔTs, the unit load ratio SCHWT is greater than the preset load ratio SCHWTs, and the solution outlet concentration C of the low-temperature generator 102 is greater than the preset solution outlet concentration Cs.

[0076] Figure 7 It is used for control Figure 6 The control flow diagram of the lithium bromide refrigeration unit is shown. Figure 7 The control flow diagram shown is Figure 4The control flowcharts shown are largely the same, and the same parts are indicated by the same labels, so they will not be repeated here. The difference is that in step 704, the processor 342 obtains the temperature of the liquid entering the lithium bromide chiller (i.e., the current inlet temperature Ti) from the unit inlet temperature detection device 211, the temperature of the liquid leaving the lithium bromide chiller (i.e., the current outlet temperature To) from the unit outlet temperature detection device 212, and the solution outlet concentration C of the lithium bromide solution leaving the cryogenic generator 102 from the concentration detection device 601. Subsequently, the processor 342 transfers the operation to... Figure 7 Step 406. In step 714, processor 342 adjusts the opening degree of heat source regulating device 121 and bypass regulating device 122 according to the current unit load ratio SCHWT and the current unit outlet temperature To of the lithium bromide chiller, and adjusts the opening degree of solution pipeline regulating device 123 according to the solution outlet concentration C. Subsequently, processor 342 transfers the operation to Figure 7 Step 402 in the process.

[0077] Figure 8 yes Figure 7 The detailed control flow diagram for step 714 is shown below. Figure 8 As shown, in step 502, the processor 342 determines whether the current unit load ratio SCHWT is less than the preset load ratio SCHWTs. If the processor 342 determines that the current unit load ratio SCHWT is less than the preset load ratio SCHWTs, the processor 342 will transfer the operation to... Figure 5 Step 504 in [the document / section]. (See reference.) Figure 5 In step 504, the processor 342 adjusts the opening of the solution pipeline regulating device 123 to the second opening of the solution to minimize the flow rate of the lithium bromide dilute solution entering the low-temperature generator 102.

[0078] If the processor 342 determines that the current unit load ratio SCHWT is greater than or equal to the preset load ratio SCHWTs, the processor 342 will transfer the operation to... Figure 8 Step 512 in the process.

[0079] In step 512, processor 342 determines whether the current outlet temperature To of the lithium bromide chiller is less than the preset outlet temperature Tos. If processor 342 determines that the current outlet temperature To of the lithium bromide chiller is greater than or equal to the preset outlet temperature Tos, processor 342 proceeds to step 522. If processor 342 determines that the current outlet temperature To of the lithium bromide chiller is less than the preset outlet temperature Tos, processor 342 proceeds to step 802.

[0080] In step 802, processor 342 increases the opening of bypass regulating device 122 to reduce the flow rate of heat source fluid entering cryogenic generator 102 and auxiliary generator 103. Subsequently, processor 342 proceeds to step 812.

[0081] In step 522, processor 342 determines whether the current outlet temperature of the lithium bromide chiller is greater than the preset outlet temperature. If processor 342 determines that the current outlet temperature of the lithium bromide chiller is not greater than the preset outlet temperature, processor 342 proceeds to step 402. That is, if processor 342 determines that the current outlet temperature of the lithium bromide chiller is equal to the preset outlet temperature, processor 342 will maintain the current opening of bypass regulating device 122 and solution pipeline regulating device 123.

[0082] In step 522, if the processor 342 determines that the current outlet temperature of the lithium bromide chiller is greater than the preset outlet temperature, the processor 342 will transfer the operation to step 804.

[0083] In step 804, processor 342 reduces the opening of bypass regulating device 122 to increase the flow rate of the heat source fluid entering cryogenic generator 102 and auxiliary generator 103. Subsequently, processor 342 proceeds to step 812.

[0084] In step 812, processor 342 determines whether the solution outlet concentration c is less than the preset solution outlet concentration Cs. If processor 342 determines that the solution outlet concentration c is less than the preset solution outlet concentration Cs, processor 342 proceeds to step 814.

[0085] In step 814, processor 342 reduces the opening of solution line regulating device 123 to decrease the flow rate of dilute lithium bromide solution entering cryogenic generator 102. Then, processor 342 proceeds to step 402.

[0086] In step 812, if the processor 342 determines that the solution outlet concentration c is greater than or equal to the preset solution outlet concentration Cs, the processor 342 will transfer the operation to step 816.

[0087] In step 816, processor 342 increases the opening of solution line regulating device 123 to increase the flow rate of the dilute lithium bromide solution entering the cryogenic generator 102. Then, processor 342 proceeds to step 402.

[0088] The solution pipeline regulating device 123 of the lithium bromide refrigeration unit in the second embodiment of this application regulates the solution pipeline based on the solution outlet concentration of the low temperature generator 102, thereby making the regulation of the solution pipeline regulating device 123 by the control device 202 more real-time.

[0089] Figure 9 The present invention relates to a system diagram and a control system diagram of a lithium bromide refrigeration unit according to a third embodiment of the present application. Figure 9 The third embodiment of the lithium bromide refrigeration unit shown is similar to... Figures 1-2 The first embodiment of the lithium bromide refrigeration unit shown is largely the same and will not be described again here. The main difference lies in: (e.g.) Figures 1-2 In the first embodiment of the lithium bromide refrigeration unit shown, one end of the high-temperature bypass pipe 112 is connected to the outlet of the high-temperature generator 101, and the other end of the high-temperature bypass pipe 112 is connected to the outlet of the heat source pipe 110, thereby reducing the flow rate of the heat source fluid through the low-temperature generator 102 and the auxiliary generator 103. In contrast, as shown... Figure 9 In the third embodiment of the lithium bromide refrigeration unit shown, one end of the high-temperature bypass line 902 is connected to the outlet of the low-temperature generator 102 (i.e., connected to the inlet of the auxiliary generator 103), and the other end of the high-temperature bypass line 112 is connected to the outlet of the heat source line 110, thereby reducing the flow rate of the heat source fluid through the auxiliary generator 103. A bypass regulating device 912 is provided on the high-temperature bypass line 902 to regulate the flow rate of the heat source fluid flowing from the low-temperature generator 102 through the auxiliary generator 103.

[0090] In the third embodiment of the lithium bromide refrigeration unit of this application, a high cooling COP can be maintained when the unit load of the lithium bromide refrigeration unit is less than the ideal load. Specifically, the inventors of this application have discovered that since the contribution of the auxiliary generator 103 to the cooling capacity is lower than that of the cryogenic generator 102, when the unit load of the lithium bromide refrigeration unit is less than the ideal load, adjusting the opening degree of the bypass regulating device 912 can regulate the flow rate of the heat source fluid flowing through the auxiliary generator 103, thereby improving the cooling COP of the lithium bromide refrigeration unit.

[0091] Although embodiments of bypassing the cryogenic generator 102 and auxiliary generator 103 via the high-temperature bypass line 112 and the auxiliary generator 103 via the high-temperature bypass line 902 are shown in this application, embodiments of bypassing the cryogenic generator 102 via the high-temperature bypass line are also within the scope of protection of this application. Since the cryogenic generator 102 contributes less to the cooling capacity than the high-temperature generator 101, when the load of the lithium bromide refrigeration unit is less than the ideal load, adjusting the opening of the bypass regulating device can regulate the flow rate of the heat source fluid flowing through the cryogenic generator 102, thereby improving the cooling COP of the lithium bromide refrigeration unit.

[0092] Although this disclosure has been described in conjunction with examples of the embodiments outlined above, various alternatives, modifications, variations, improvements, and / or substantially equivalents, whether known or currently or soon to be foreseen, will likely be apparent to those skilled in the art. Furthermore, the technical effects and / or technical problems described herein are exemplary and not limiting; therefore, the disclosures herein may be used to solve other technical problems and have other technical effects and / or can solve other technical problems. Accordingly, the examples of embodiments of this disclosure as set forth above are intended to be illustrative and not limiting. Various changes may be made without departing from the spirit or scope of this disclosure. Therefore, this disclosure is intended to include all known or previously developed alternatives, modifications, variations, improvements, and / or substantially equivalents.

Claims

1. A lithium bromide refrigeration unit, characterized in that, The lithium bromide refrigeration unit includes: High temperature generator (101), low temperature generator (102) and auxiliary generator (103); A heat source pipeline (110) passes sequentially through the high-temperature generator (101), the low-temperature generator (102), and the auxiliary generator (103), and the heat source pipeline (110) is configured to receive heat source fluid, such that the heat source fluid passes sequentially through the high-temperature generator (101), the low-temperature generator (102), and the auxiliary generator (103); A high-temperature bypass pipeline (112, 902) is provided, one end of which is connected to the outlet of the high-temperature generator (101) or the outlet of the low-temperature generator (102), and the other end of which is connected to the outlet of the heat source pipeline (110), thereby reducing the flow rate of the heat source fluid through the low-temperature generator (102) and the auxiliary generator (103); A bypass regulating device (122, 912) is disposed on the high-temperature bypass pipeline (112, 902) to regulate the flow rate of the heat source fluid flowing from the high-temperature generator (101) through the low-temperature generator (102) and / or the auxiliary generator (103); and A control device (202) is communicatively connected to the bypass regulating device (122, 912) and configured to adjust the opening degree of the bypass regulating device (122, 912) according to the unit load of the lithium bromide refrigeration unit.

2. The lithium bromide refrigeration unit according to claim 1, characterized in that, The lithium bromide refrigeration unit also includes: A heat source regulating device (121) is disposed on the heat source pipeline (110) and configured to regulate the flow rate of the heat source fluid entering the high temperature generator (101); The control device (202) is communicatively connected to the heat source regulating device (121) and is configured to adjust the opening degree of the heat source regulating device (121) according to the unit load.

3. The lithium bromide refrigeration unit according to claim 2, characterized in that: The unit load is based on the unit inlet temperature and the unit outlet temperature of the lithium bromide chiller. The unit load includes chilled water temperature difference and unit load ratio. The chilled water temperature difference is the difference between the unit inlet temperature and the unit outlet temperature. The unit load ratio is the ratio of the chilled water temperature difference to the preset chilled water temperature difference. The control device (202) is configured such that when the chilled water temperature difference of the lithium bromide refrigeration unit is greater than or equal to the preset chilled water temperature difference, the control device (202) adjusts the opening degree of the heat source regulating device (121) to the first opening degree of the heat source and adjusts the opening degree of the bypass regulating device (122, 912) to the second opening degree of the bypass.

4. The lithium bromide refrigeration unit according to claim 3, characterized in that: The control device (202) is configured to adjust the opening degree of the bypass regulating device (122, 912) to the first bypass opening degree when the chilled water temperature difference of the lithium bromide chiller is less than the preset chilled water temperature difference and the unit load ratio is less than the preset load ratio. Wherein, the second bypass opening is smaller than the first bypass opening.

5. The lithium bromide refrigeration unit according to claim 4, characterized in that: The control device (202) is configured to reduce the opening of the heat source regulating device (121) when the opening degree of the bypass regulating device (122, 912) is the first bypass opening degree and the outlet temperature of the lithium bromide refrigeration unit is less than the preset outlet temperature.

6. The lithium bromide refrigeration unit according to claim 4, characterized in that: The control device (202) is configured to increase the opening of the heat source regulating device (121) when the opening degree of the bypass regulating device (122, 912) is the first bypass opening degree and the outlet temperature of the lithium bromide refrigeration unit is greater than the preset outlet temperature.

7. The lithium bromide refrigeration unit according to claim 3, characterized in that: The control device (202) is configured to increase the opening degree of the bypass regulating device (122, 912) when the chilled water temperature difference of the lithium bromide chiller is less than the preset chilled water temperature difference, the load ratio of the unit is greater than the preset load ratio, and the outlet temperature of the lithium bromide chiller is less than the preset outlet temperature. The control device (202) is configured to reduce the opening degree of the bypass regulating device (122, 912) when the chilled water temperature difference of the lithium bromide chiller is less than the preset chilled water temperature difference, the load ratio of the unit is greater than the preset load ratio, and the outlet temperature of the lithium bromide chiller is greater than the preset outlet temperature.

8. The lithium bromide refrigeration unit according to claim 3, characterized in that, The lithium bromide refrigeration unit also includes: Absorber (104); A solution conduit (111) connecting the absorber (104) and the cryogenic generator (102) and configured to allow a solution in the absorber (104) to enter the cryogenic generator (102); and A solution pipeline regulating device (123) is disposed on the solution pipeline (111) and configured to regulate the flow rate of the solution entering the low-temperature generator (102).

9. The lithium bromide refrigeration unit according to claim 8, characterized in that: The control device (202) is configured to adjust the opening of the solution pipeline regulating device (123) according to the cold water temperature difference, the unit load ratio and the outlet temperature of the lithium bromide refrigeration unit.

10. The lithium bromide refrigeration unit according to claim 9, characterized in that: The control device (202) is configured to adjust the opening degree of the solution pipeline regulating device (123) to the first opening degree of the solution when the cold water temperature difference of the lithium bromide refrigeration unit is greater than or equal to the preset cold water temperature difference. The control device (202) is configured to adjust the opening of the solution pipeline regulating device (123) to the second opening degree when the chilled water temperature difference of the lithium bromide refrigeration unit is less than the preset chilled water temperature difference and the unit load ratio is less than the preset load ratio. Wherein, the second opening degree of the solution is smaller than the first opening degree of the solution.

11. The lithium bromide refrigeration unit according to claim 9, characterized in that: The control device (202) is configured to: when the chilled water temperature difference of the lithium bromide chiller is less than the preset chilled water temperature difference, the load ratio of the unit is greater than the preset load ratio, and the outlet temperature of the lithium bromide chiller is less than the preset outlet temperature, the control device (202) reduces the opening of the solution pipeline regulating device (123). The control device (202) is configured to increase the opening of the solution pipeline regulating device (123) when the chilled water temperature difference of the lithium bromide chiller is less than the preset chilled water temperature difference, the load ratio of the unit is greater than the preset load ratio, and the outlet temperature of the lithium bromide chiller is greater than the preset outlet temperature.

12. The lithium bromide refrigeration unit according to claim 8, characterized in that: The control device (202) is configured to adjust the opening of the solution pipeline regulating device (123) according to the cold water temperature difference, the unit load ratio and the solution outlet concentration of the low temperature generator (102).

13. The lithium bromide refrigeration unit according to claim 12, characterized in that: The control device (202) is configured to adjust the opening degree of the solution pipeline regulating device (123) to the first opening degree of the solution when the cold water temperature difference of the lithium bromide refrigeration unit is greater than or equal to the preset cold water temperature difference. The control device (202) is configured to adjust the opening of the solution pipeline regulating device (123) to the second opening degree when the chilled water temperature difference of the lithium bromide refrigeration unit is less than the preset chilled water temperature difference and the unit load ratio is less than the preset load ratio. Wherein, the second opening degree of the solution is smaller than the first opening degree of the solution.

14. The lithium bromide refrigeration unit according to claim 12, characterized in that: The control device (202) is configured to reduce the opening of the solution pipeline regulating device (123) when the chilled water temperature difference of the lithium bromide refrigeration unit is less than the preset chilled water temperature difference, the unit load ratio is greater than the preset load ratio, and the solution outlet concentration of the low temperature generator (102) is less than the preset solution outlet concentration. The control device (202) is configured to increase the opening of the solution pipeline regulating device (123) when the chilled water temperature difference of the lithium bromide refrigeration unit is less than the preset chilled water temperature difference, the unit load ratio is greater than the preset load ratio, and the solution outlet concentration of the low temperature generator (102) is greater than the preset solution outlet concentration.

15. The lithium bromide refrigeration unit according to claim 4, characterized in that, The lithium bromide refrigeration unit also includes: A unit inlet temperature detection device (211), configured to detect the temperature of the liquid entering the lithium bromide refrigeration unit; and Unit outlet temperature detection device (212), the unit outlet temperature detection device (212) is configured to detect the temperature of the liquid leaving the lithium bromide refrigeration unit; The control device (202) is communicatively connected to the unit inlet temperature detection device (211) and the unit outlet temperature detection device (212), and is configured to calculate the unit load ratio based on the temperature of the liquid entering the lithium bromide chiller and the temperature of the liquid leaving the lithium bromide chiller.

16. The lithium bromide refrigeration unit according to claim 12, characterized in that, The lithium bromide refrigeration unit also includes: A concentration detection device (601) is configured to detect the concentration of the solution leaving the low-temperature generator (102) and is communicatively connected to the control device (202).

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