Absorption chiller and control method for absorption chiller

Abstract

This application discloses an absorption chiller unit and a control method for the absorption chiller unit. The absorption chiller unit includes an evaporator, refrigerant piping, and a refrigerant control valve. The refrigerant piping is connected to the evaporator. The refrigerant control valve is disposed on the refrigerant piping and configured to control the flow rate of refrigerant entering the evaporator. The absorption chiller unit of this application is equipped with a refrigerant control valve for regulating the flow rate of refrigerant entering the evaporator, thereby achieving higher evaporator efficiency.

Description

Technical Field

[0001] This application relates to absorption chillers, and to a control method for absorption chillers. Background Technology

[0002] Absorption chillers include an evaporator. The evaporator contains refrigerant. To provide a lower chilled water outlet temperature, a solution is introduced into the evaporator.

[0003] However, the evaporator has a low evaporation efficiency. Summary of the Invention

[0004] Exemplary embodiments of this application can solve at least some of the above-mentioned problems.

[0005] According to a first aspect of this application, an absorption chiller unit is provided, the absorption chiller unit including an evaporator, a refrigerant pipeline, and a refrigerant control valve. The refrigerant pipeline is in communication with the evaporator. The refrigerant control valve is disposed on the refrigerant pipeline and configured to control the flow rate of refrigerant entering the evaporator.

[0006] According to the absorption chiller unit of the first aspect described above, the absorption chiller unit further includes a solution pipeline and a solution control valve. The solution pipeline is in communication with the evaporator. The solution control valve is disposed on the solution pipeline and configured to control the flow rate of the solution entering the evaporator.

[0007] According to the absorption chiller unit of the first aspect described above, the absorption chiller unit further includes a circulation pipe and a circulation device. The circulation pipe has a circulation inlet and a circulation outlet, which are in communication with the evaporator. The circulation device is disposed on the circulation pipe and configured to allow liquid in the evaporator to return to the evaporator after passing through the circulation pipe.

[0008] According to the absorption chiller unit of the first aspect described above, the absorption chiller unit further includes a specific gravity detection device, a liquid level detection device, and a control device. The specific gravity detection device is configured to detect the specific gravity of the liquid in the evaporator. The liquid level detection device is configured to detect the liquid level in the evaporator. The control device is communicatively connected to the specific gravity detection device, the liquid level detection device, the refrigerant control valve, and the solution control valve. The control device is configured to control the solution control valve based on the specific gravity signal received by the specific gravity detection device and the liquid level signal received by the liquid level detection device, and is also configured to control the refrigerant control valve based on the specific gravity signal received by the specific gravity detection device.

[0009] According to a second aspect of this application, this application provides a control method, the control method of the absorption turbine unit comprising:

[0010] Obtain the current liquid level and specific gravity of the evaporator;

[0011] The amount of solution entering the evaporator is controlled based on the current liquid level and specific gravity.

[0012] The amount of refrigerant entering the evaporator is controlled according to the current specific gravity.

[0013] According to the control method of the absorption unit in the second aspect above, controlling the amount of solution entering the evaporator based on the current liquid level and current specific gravity includes opening and closing the solution control valve.

[0014] According to the control method of the absorption chiller unit in the second aspect above, controlling the amount of refrigerant entering the evaporator according to the current specific gravity includes adjusting the opening of the refrigerant control valve.

[0015] According to the control method of the absorption chiller unit in the second aspect above, controlling the amount of solution entering the evaporator based on the current liquid level and current specific gravity includes:

[0016] Determine whether the current liquid level is lower than the first liquid level;

[0017] When the current liquid level is lower than the first liquid level, the circulation device is shut down and the solution control valve is opened;

[0018] When the current liquid level is not lower than the first liquid level, the circulation device is turned on.

[0019] According to the control method of the absorption chiller unit in the second aspect above, the step of controlling the amount of solution entering the evaporator based on the current liquid level and current specific gravity further includes:

[0020] When the current liquid level is not lower than the first liquid level and is lower than the second liquid level, the opening of the solution control valve is maintained;

[0021] When the current liquid level is not lower than the second liquid level and is lower than the third liquid level, and the current specific gravity is not greater than the second specific gravity, the opening of the solution control valve is maintained;

[0022] When the current liquid level is not lower than the second liquid level and is lower than the third liquid level, and the current specific gravity is greater than the second specific gravity, the solution control valve is closed;

[0023] Wherein, the first liquid level is lower than the second liquid level, and the second liquid level is lower than the third liquid level.

[0024] According to the control method of the absorption chiller unit in the second aspect above, controlling the amount of solvent entering the evaporator based on the current specific gravity includes:

[0025] When the current specific gravity is less than the first specific gravity, reduce the amount of refrigerant entering the evaporator;

[0026] When the current specific gravity is not less than the first specific gravity and less than the second specific gravity, maintain the amount of refrigerant entering the evaporator;

[0027] When the current specific gravity is not less than the second specific gravity, increase the amount of refrigerant entering the evaporator;

[0028] Wherein, the first proportion is less than the second proportion.

[0029] The absorption chiller unit of this application is equipped with a refrigerant control valve to regulate the flow rate of refrigerant entering the evaporator, thereby adjusting the specific gravity of the mixed solution in the evaporator to be no less than a first specific gravity and no greater than a second specific gravity. When the specific gravity is no less than the first specific gravity and no greater than the second specific gravity, the evaporator efficiency is higher. Attached Figure Description

[0030] 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:

[0031] Figure 1 This is a system diagram of the absorption chiller unit of this application;

[0032] Figure 2 This is a control system diagram of the absorption turbine unit of this application;

[0033] Figure 3 yes Figure 1 A schematic internal structure diagram of the control device 202 shown;

[0034] Figure 4 This is the control flow diagram of the absorption turbine unit controlled by control device 202;

[0035] Figure 5 The steps in step 406 are shown in more detail;

[0036] Figure 6 The steps in step 408 are shown in more detail;

[0037] Figure 7 This is the specific gravity-chilled water outlet temperature table for the absorption chiller unit of this application when the evaporator efficiency is 95%. Detailed Implementation

[0038] 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" and "lower," 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 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.

[0039] Ordinal numbers such as “first” and “second” used in this application are for distinction and identification only and have no other meaning. Unless otherwise specified, they do not indicate a specific order or a specific relationship. For example, the term “first liquid level” does not imply the existence of a “second liquid level”, and the term “second liquid level” does not imply the existence of a “first liquid level”.

[0040] Figure 1 This is a system diagram of the absorption chiller unit of this application. (See diagram below.) Figure 1As shown, the absorption chiller unit of this application includes an evaporator 102, a refrigerant conduit 122, a solution conduit 132, and a circulation conduit 142. The evaporator 102 defines an evaporator cavity 104. The refrigerant conduit 122 communicates with the evaporator 102, allowing refrigerant to flow into the evaporator cavity 104 through the refrigerant conduit 122. In an embodiment of this application, the outlet of the refrigerant conduit 122 is connected to the top of the evaporator 102. A refrigerant control valve 124 is disposed on the refrigerant conduit 122 and configured to control the flow rate of refrigerant entering the evaporator 102. The solution conduit 132 communicates with the evaporator 102, allowing solution to flow into the evaporator cavity 104 through the solution conduit 132. In an embodiment of this application, the outlet of the solution conduit 132 is connected to the bottom of the evaporator 102. The solution control valve 134 is disposed on the solution conduit 132 and configured to control the flow rate of solution entering the evaporator 102. The circulation pipe 142 has a circulation inlet 1461 and a circulation outlet 1462. Both the circulation inlet 1461 and the circulation outlet 1462 are in communication with the evaporator 102, allowing the mixed solution (i.e., a mixture of refrigerant and solution) in the evaporator cavity 104 to flow out of the evaporator cavity 104 through the circulation inlet 1461 and then re-enter the evaporator cavity 104 through the circulation outlet 1462. In embodiments of this application, the circulation inlet 1461 is located at the bottom of the evaporator 102, and the circulation outlet 1462 is located at the top of the evaporator 102. A circulation device 146 is provided on the circulation pipe 142 and configured to allow liquid (i.e., the mixed solution) in the evaporator 102 to return to the evaporator 102 after passing through the circulation pipe 142. The circulation device 146 enables liquid movement in the evaporator cavity 104, thereby improving the mixing of the refrigerant and solution. As an example, the circulation device 146 is a pump.

[0041] like Figure 1 As shown, the absorption chiller unit of this application further includes a specific gravity detection device 144 and a liquid level detection device 148. The specific gravity detection device 144 is configured to detect the specific gravity of the liquid in the evaporator 102. In an embodiment of this application, the specific gravity detection device 144 is disposed on the circulation pipe 142. The liquid level detection device 148 is configured to detect the liquid level in the evaporator 102. In an embodiment of this application, the liquid level detection device 148 is disposed on the evaporator 102.

[0042] like Figure 1As shown, the evaporator 102 of this application is also provided with a gas port 112 and a liquid overflow port 114. The gas port 112 is located at the upper part of the evaporator 102, so that the refrigerant evaporated into gas in the evaporator cavity 104 enters the absorber (not shown) through the gas port 112. The liquid overflow port 114 is located in the lower middle part of the evaporator 102, so that when the liquid level in the evaporator cavity 104 reaches the liquid level at the liquid overflow port 114, the liquid in the evaporator cavity 104 can enter the absorber (not shown) through the liquid overflow port 114.

[0043] like Figure 1 As shown, the absorption chiller unit of this application also includes a chilled water pipe 103. The chilled water pipe 103 extends from the outside of the evaporator 102 into the evaporator cavity 104 and then exits the evaporator 102. Higher temperature chilled water can enter the evaporator cavity 104 through the chilled water pipe 103. In the evaporator cavity 104, the higher temperature chilled water heats the mixed solution, causing the refrigerant in the mixed solution to evaporate and become gaseous refrigerant, which flows out of the evaporator 102 from the gas port 112. When the higher temperature chilled water heats the mixed solution, its temperature decreases, and after reaching a predetermined temperature, it flows out of the evaporator 102.

[0044] In this application, the specific gravity of the solution is higher than that of the refrigerant, and the freezing point of the mixture of solution and refrigerant is lower than that of the refrigerant. As an example, the absorption chiller is a lithium bromide chiller. The refrigerant is water. The solution is lithium bromide.

[0045] It should be noted that although in this application the outlet of the refrigerant pipe 122 is connected to the top of the evaporator 102 and the outlet of the solution pipe 132 is connected to the bottom of the evaporator 102, in other embodiments, the outlets of the refrigerant pipe 122 and the solution pipe 132 can be located at any position on the evaporator 102, as long as they are connected to the evaporator cavity 104. Furthermore, although the specific gravity detection device 144 in this application is located on the circulation pipe 142, in other embodiments, the specific gravity detection device 144 can be located at any position capable of detecting the specific gravity of the liquid in the evaporator 102.

[0046] Figure 2 This is a control system diagram of the absorption turbine unit of this application. (See diagram below.) Figure 2As shown, the absorption chiller unit also includes a control device 202. The control device 202 is communicatively connected to a specific gravity detection device 144, a liquid level detection device 148, a refrigerant control valve 124, a solution control valve 134, and a circulation device 146. The specific gravity detection device 144 generates a specific gravity signal and provides it to the control device 202. The liquid level detection device 148 generates a liquid level signal and provides it to the control device 202. The control device 202 is configured to control the solution control valve 134 based on the received specific gravity signal and liquid level signal, to control the refrigerant control valve 124 based on the received specific gravity signal, and to control the opening and closing of the circulation device 146 based on the received liquid level signal. In an embodiment of this application, the refrigerant control valve 124 is a regulating valve. The opening degree of the refrigerant control valve 124 can be adjusted, thereby regulating the flow rate of refrigerant entering the evaporator 102. In an embodiment of this application, the solution control valve 134 is a switching valve. The solution control valve 134 can be opened or closed to regulate the flow rate of the solution entering the evaporator 102.

[0047] Figure 3 yes Figure 1 A schematic internal structure diagram of the control device 202 shown. Figure 3 As shown, the control device 202 includes a bus 302, a processor 304, an input device 308, an output device 312, and a memory 318 containing a control program 320. Each component of the control device 202, including the processor 304, input device 308, output device 312, and memory 318, is communicatively connected to the bus 302, enabling the processor 304 to control the operation of the input device 308, output device 312, and memory 318. Specifically, the memory 318 stores programs, instructions, and data, while the processor 304 reads programs, instructions, and data from the memory 318 and writes data to the memory 318. By executing the programs and instructions read from the memory 318, the processor 304 controls the operation of the input device 308 and the output device 312. The input device 308 receives external signals and data via connections 321 and 322, including the current specific gravity detected by the specific gravity detection device 144 and the current liquid level detected by the liquid level detection device 148. The output device 312 sends control signals to the refrigerant control valve 124, the solution control valve 134 and the circulation device 146 respectively through the connecting lines 323, 324 and 325, thereby controlling the opening and closing of the solution control valve 134 and the circulation device 146 and controlling the opening degree of the refrigerant control valve 124.

[0048] In the embodiments of this application, the implementation is as follows: Figures 4-6The program in the flowchart shown is stored in the memory 318 of the control device 202. The processor 304 executes the program stored in the control device 202, which then controls the refrigerant control valve 124, the solution control valve 134, and the circulation device 146. Furthermore, the memory 318 also stores information such as a first liquid level, a second liquid level, a third liquid level, a first specific gravity, and a second specific gravity. The first liquid level is lower than the second liquid level, the second liquid level is lower than the third liquid level, the third liquid level is lower than the liquid level at the overflow port 114, and the first specific gravity is less than the second specific gravity.

[0049] Figure 4 This is the control flow diagram of the absorption turbine unit controlled by control device 202. (For example...) Figure 4 As shown, in step 402, processor 304 opens circulation device 146, closes solution control valve 134, and maintains refrigerant control valve 124 in its current state (i.e., maintains the opening of refrigerant control valve 124 at the time of the last shutdown). Subsequently, processor 304 proceeds to step 404.

[0050] In step 404, the processor 304 obtains the current specific gravity through the specific gravity detection device 144 and the current liquid level through the liquid level detection device 148. Subsequently, the processor 304 transfers the operation to step 406.

[0051] In step 406, processor 304 controls the amount of solution entering evaporator 102 based on the current liquid level and specific gravity. Then, processor 304 proceeds to step 408.

[0052] In step 408, processor 304 controls the amount of refrigerant entering evaporator 102 based on the current specific gravity. Then, processor 304 proceeds to step 412.

[0053] In step 412, processor 304 determines whether the absorption chiller is powered off. If processor 304 determines that the absorption chiller is powered off, processor 304 will terminate the program. If processor 304 determines that the absorption chiller is not powered off, processor 304 will proceed to step 404.

[0054] Figure 5 The steps in step 406 are shown in more detail. For example... Figure 5 As shown, in step 502, processor 304 determines whether the current liquid level is lower than the first liquid level. If processor 304 determines that the current liquid level is lower than the first liquid level, processor 304 will transfer the operation to step 504.

[0055] In step 504, processor 304 shuts down circulation device 146 and opens solution control valve 134. The purpose of step 504 is to stop circulation device 146 when the current liquid level is low, thereby protecting circulation device 146 and raising the current liquid level as quickly as possible. After completing step 504, processor 304 proceeds to step 502.

[0056] In step 502, if the processor 304 determines that the current liquid level is not lower than the first liquid level, the processor 304 will transfer the operation to step 506.

[0057] In step 506, processor 304 turns on loop device 146. In other words, if loop device 146 is currently in a closed state, it changes from a closed state to an open state. If loop device 146 is currently in an open state, it remains in an open state. After completing step 506, processor 304 proceeds to step 508.

[0058] In step 508, processor 304 determines whether the current liquid level is lower than the second liquid level. If processor 304 determines that the current liquid level is lower than the second liquid level, processor 304 proceeds to step 509.

[0059] In step 509, processor 304 maintains the opening of solution control valve 134. Then, processor 304 proceeds to step 408.

[0060] In step 508, if the processor 304 determines that the current liquid level is not lower than the second liquid level, the processor 304 will transfer the operation to step 512.

[0061] In step 512, processor 304 determines whether the current liquid level is lower than the third liquid level. If processor 304 determines that the current liquid level is not lower than the third liquid level, processor 304 proceeds to step 514.

[0062] In step 514, processor 304 closes solution control valve 134. Then, processor 304 proceeds to step 408.

[0063] In step 512, if the processor 304 determines that the current liquid level is lower than the third liquid level, the processor 304 will transfer the operation to step 516.

[0064] In step 516, processor 304 determines whether the current proportion is greater than the second proportion. If processor 304 determines that the current proportion is greater than the second proportion, processor 304 proceeds to step 514. If processor 304 determines that the current proportion is not greater than the second proportion, processor 304 proceeds to step 518.

[0065] In step 518, processor 304 maintains the opening of solution control valve 134. Then, processor 304 proceeds to step 408.

[0066] Figure 6 The steps in step 408 are shown in more detail. For example... Figure 6 As shown, in step 602, processor 304 determines whether the current proportion is less than the first proportion. If processor 304 determines that the current proportion is less than the first proportion, processor 304 transfers the operation to step 604.

[0067] In step 604, processor 304 reduces the opening of refrigerant control valve 124, thereby reducing the flow rate of refrigerant entering evaporator 102. Then, processor 304 proceeds to step 412.

[0068] In step 602, if the processor 304 determines that the current proportion is not less than the first proportion, the processor 304 will transfer the operation to step 606.

[0069] In step 606, processor 304 determines whether the current proportion is greater than the second proportion. If processor 304 determines that the current proportion is greater than the second proportion, processor 304 proceeds to step 608.

[0070] In step 608, processor 304 increases the opening of refrigerant control valve 124, thereby increasing the flow rate of refrigerant into evaporator 102. Then, processor 304 proceeds to step 412.

[0071] In step 606, if the processor 304 determines that the current proportion is not greater than the second proportion, the processor 304 will transfer the operation to step 610.

[0072] In step 610, processor 304 maintains the opening of refrigerant control valve 124 to maintain the flow of refrigerant into evaporator 102. Then, processor 304 proceeds to step 412.

[0073] Therefore, the control method of the absorption unit of this application can adjust the specific gravity of the mixed solution in the evaporator 102 to a current specific gravity that is not less than the first specific gravity and not greater than the second specific gravity.

[0074] In existing absorption chillers, the evaporator contains a mixed solution; however, the evaporation efficiency of the evaporator is low. The inventors of this application have discovered that in the prior art, the refrigerant enters the evaporator at a constant flow rate. This results in a higher specific gravity in the evaporator when the evaporation rate is high, leading to lower evaporator efficiency.

[0075] The absorption chiller unit of this application is equipped with a refrigerant control valve to regulate the flow rate of refrigerant entering the evaporator, thereby adjusting the specific gravity of the mixed solution in the evaporator to be no less than a first specific gravity and no greater than a second specific gravity. When the specific gravity is no less than the first specific gravity and no greater than the second specific gravity, the evaporator efficiency is higher.

[0076] Figure 7 This is a specific gravity-chilled water outlet temperature table for the absorption chiller unit of this application when the evaporator efficiency is 95%. Figure 7 As shown, the first and second specific gravities of this application can be set according to the cold water outlet temperature. For example, when the cold water outlet temperature is -10°C to -5°C, the first specific gravity can be set to 1160 and the second specific gravity can be set to 1180.

[0077] Furthermore, the control method of the absorption chiller of this application, by controlling the amount of solution and refrigerant, can adjust the liquid level in the evaporator to be higher than the second liquid level, and can ensure that the current specific gravity in the evaporator is not less than the first specific gravity and not greater than the second specific gravity. Therefore, the liquid level in the evaporator of the absorption chiller of this application is located at a safe liquid level (e.g., the first liquid level), and the evaporator operates with high efficiency.

[0078] 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 control method of an absorption chiller unit comprising an evaporator (102), characterized in that, The control method for the absorption turbine unit includes: Obtain the current liquid level and specific gravity of the liquid in the evaporator (102); The flow rate of the solution entering the evaporator (102) is controlled based on the current liquid level and the current specific gravity; and The flow rate of refrigerant entering the evaporator (102) is controlled according to the current specific gravity. The control of the refrigerant flow rate into the evaporator (102) based on the current specific gravity includes: When the current specific gravity is less than the first specific gravity, the flow rate of refrigerant entering the evaporator (102) is reduced; When the current specific gravity is not less than the first specific gravity and not greater than the second specific gravity, the flow rate of refrigerant entering the evaporator (102) is maintained; and When the current specific gravity is greater than the second specific gravity, the flow rate of refrigerant entering the evaporator (102) is increased. Wherein, the first proportion is less than the second proportion.

2. The control method for an absorption chiller unit according to claim 1, characterized in that: Controlling the flow rate of the solution entering the evaporator (102) based on the current liquid level and the current specific gravity includes opening and closing a solution control valve (134), which is located on a solution pipe (132) connected to the evaporator (102).

3. The control method for an absorption chiller unit according to claim 1, characterized in that: Controlling the flow rate of refrigerant entering the evaporator (102) according to the current specific gravity includes adjusting the opening of the refrigerant control valve (124), which is located on the refrigerant pipe (122) connected to the evaporator (102).

4. The control method of an absorption chiller unit according to claim 1, characterized by, Controlling the flow rate of the solution entering the evaporator (102) based on the current liquid level and the current specific gravity includes: Determine whether the current liquid level is lower than the first liquid level; When the current liquid level is lower than the first liquid level, the circulation device (146) is shut off and the solution control valve (134) is opened. The circulation device (146) is located on a circulation pipe (142) connected to the evaporator (102) and configured to allow liquid in the evaporator (102) to return to the evaporator (102) after passing through the circulation pipe (142). The solution control valve (134) is located on a solution pipe (132) connected to the evaporator (102). When the current liquid level is not lower than the first liquid level, the circulation device (146) is turned on.

5. The control method for an absorption chiller unit according to claim 4, characterized in that, Controlling the flow rate of the solution entering the evaporator (102) based on the current liquid level and the current specific gravity also includes: When the current liquid level is not lower than the first liquid level and is lower than the second liquid level, the opening of the solution control valve (134) is maintained; When the current liquid level is not lower than the second liquid level and is lower than the third liquid level, and the current specific gravity is not greater than the second specific gravity, the opening of the solution control valve (134) is maintained; and When the current liquid level is not lower than the second liquid level and is lower than the third liquid level, and the current specific gravity is greater than the second specific gravity, the solution control valve (134) is closed. Wherein, the first liquid level is lower than the second liquid level, and the second liquid level is lower than the third liquid level.

6. The control method for an absorption chiller unit according to claim 1, characterized in that, The first specific gravity and the second specific gravity are set according to the cold water outlet temperature of the evaporator (102).

7. An absorption chiller unit, characterized in that, The absorption chiller unit includes: Evaporator (102); A specific gravity detection device (144) is configured to detect the specific gravity of the liquid in the evaporator (102); A liquid level detection device (148) configured to detect the liquid level in the evaporator (102); and A control device (202) is communicatively connected to the specific gravity detection device (144) and the liquid level detection device (148). The control device (202) is configured to perform the method of any one of claims 1-6 to control the operation of the absorption unit based on the specific gravity received from the specific gravity detection device (144) and the liquid level received from the liquid level detection device (148).

8. The absorption chiller unit according to claim 7, characterized in that, Also includes: A refrigerant conduit (122) is connected to the evaporator (102); and A refrigerant control valve (124) is disposed on the refrigerant line (122) and communicatively connected to the control device (202), and is configured to be controlled by the control device (202) to regulate the flow rate of refrigerant entering the evaporator (102).

9. The absorption chiller unit according to claim 7, characterized in that, Also includes: Solution conduit (132), which is connected to the evaporator (102); as well as A solution control valve (134) is disposed on the solution pipeline (132) and communicatively connected to the control device (202), and is configured to be controlled by the control device (202) to regulate the flow rate of the solution entering the evaporator (102).

10. The absorption chiller unit according to claim 7, characterized in that, Also includes: A circulation pipe (142) having a circulation inlet (1461) and a circulation outlet (1462) connected to the evaporator (102); and A circulation device (146) is disposed on the circulation pipe (142) and communicatively connected to the control device (202), and is configured to be controlled by the control device (202) to return the liquid in the evaporator (102) to the evaporator (102) after passing through the circulation pipe (142).

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