Control method, system and medium of absorption refrigeration unit based on thermal compensation

Abstract

The present invention relates to a control method for an absorption refrigeration unit based on thermal compensation, comprising: obtaining the chilled water outlet temperature of an evaporator and comparing the chilled water outlet temperature with a first temperature threshold; executing a general control process if the chilled water outlet temperature is within the first temperature threshold; executing a cooling shortage control process if the chilled water outlet temperature is greater than the first temperature threshold; and executing a cooling surplus control process if the chilled water outlet temperature is less than the first temperature threshold; the cooling shortage control process, the cooling surplus control process, and the general control process are used to determine the cooling load status of the refrigeration unit based on the internal temperature of the generator or a heat balance equation; and generating a control instruction for instructing a heater to adjust its own heating power to perform thermal compensation on the refrigeration unit. The method of the present invention can reduce the hysteresis of the overall adjustment process of the refrigeration unit, thereby reducing fluctuations in the chilled water outlet temperature of the evaporator.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature recovery refrigeration, and in particular to a control method, system and medium for an absorption refrigeration unit based on heat compensation. Background Art

[0002] Absorption chillers are devices that use thermal energy as a driving force to achieve cooling. They feature a simple structure and are safe and reliable. In addition to utilizing heat generated by boiler steam and fuel, they can also utilize low-grade heat, waste heat, solar energy, and other sources. Amidst current energy shortages and increasingly severe environmental challenges, absorption chillers have attracted widespread attention due to their unique advantages. In particular, absorption chillers can utilize thermal water as a heat source to recover low-temperature heat generated during production, making them particularly popular among manufacturing companies, particularly petrochemical enterprises. Because the thermal water system and absorption chiller are at the end of the energy integration phase of the production process, they often bear the entire burden of fluctuating low-temperature waste heat supply. Fluctuations in production processes and ambient temperature can lead to long-term fluctuations in the cooling capacity of absorption chillers, which rely solely on thermal water as the heat source on the heating side, impacting the stable operation of the cooling side. In addition, fluctuations in cooling demand on the cooling side will also affect the stability of the cooling supply of the absorption refrigeration unit. In particular, when the production load on the cooling side decreases or a device stops abnormally, the chilled water outlet temperature of the absorption refrigeration unit will drop rapidly in a short period of time due to the sudden drop in cooling demand, resulting in the absorption refrigeration unit being unable to operate stably. In severe cases, it may even shut down directly, causing damage to the unit equipment.

[0003] To address these issues, existing solutions typically rely on control models or algorithms, using the chilled water outlet temperature fluctuation range as the controlled parameter to adjust the control parameters of the absorption chiller to improve the operational stability of the absorption chiller. For example, patent publication CN109858163A discloses an auto-disturbance rejection feedforward control method for a lithium bromide absorption chiller. This method uses open-loop step identification to obtain the absorption chiller's object transfer function, as well as the disturbance transfer functions derived from the heat source water inlet temperature, cooling water inlet temperature, and refrigerant water (also known as chilled water) inlet temperature. This control method uses the refrigerant water outlet temperature as the controlled parameter and the heat source water flow rate as the controlled variable to design an auto-disturbance rejection control algorithm to improve the refrigerant water outlet temperature's disturbance rejection rate and reduce the refrigerant water outlet temperature fluctuation range. However, due to the long refrigeration cycle of absorption chillers, changes in chilled water outlet temperature lag behind fluctuations in heat supply on the heating side. Therefore, when the above control method controls the chiller based solely on the chilled water outlet temperature, the control decisions generated also have a lag, resulting in frequent fluctuations in the chilled water outlet temperature of the chiller. Furthermore, since the above method controls the heat supply on the heating side by adjusting the flow rate of the heat transfer water, its adjustment capability is limited when faced with large flow and temperature fluctuations on the heating side, especially when heat supply decreases on the heating side. Summary of the Invention

[0004] (1) Technical issues to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a control method for an absorption refrigeration unit based on thermal compensation, which solves the technical problem that the control method for an absorption refrigeration unit in the prior art has a hysteresis and causes frequent fluctuations in the chilled water outlet temperature.

[0006] (2) Technical solution

[0007] In order to achieve the above objectives, the main technical solutions adopted by the present invention include:

[0008] In a first aspect, an embodiment of the present invention provides a control method for an absorption refrigeration unit based on thermal compensation, wherein the refrigeration unit includes a generator, a condenser, an evaporator, and an absorber, wherein a heater is provided inside the generator, and the heater is used to perform thermal compensation on the refrigeration unit; the control method includes:

[0009] In each preset control cycle, the chilled water outlet temperature of the evaporator is obtained and compared with the first temperature threshold.

[0010] If the chilled water outlet temperature is within the first temperature threshold range, executing the general control process;

[0011] If the chilled water outlet temperature is greater than the first temperature threshold, executing the cooling shortage control process;

[0012] If the chilled water outlet temperature is lower than the first temperature threshold, executing the cooling excess control process;

[0013] Among them, the insufficient cooling control process, the excess cooling control process and the general control process are used to judge the cooling load state of the refrigeration unit based on the heat exchange process between the refrigeration unit and the outside world, according to the internal temperature of the generator or the heat balance equation; and to generate control instructions based on the cooling load state of the refrigeration unit, and the control instructions are at least used to instruct the heater to adjust its own heating power.

[0014] The control method proposed in an embodiment of the present invention determines the cooling load status of the refrigeration unit based on the heat exchange process between the refrigeration unit and the environment, the internal temperature of the generator, and the heat balance equation. Based on this cooling load status, a control decision is generated, instructing the heater to adjust its compensation heat supply to the refrigeration unit by adjusting its own heating power. In addition to using the chilled water outlet temperature of the refrigeration unit as a controlled parameter, the method provided by the present invention also incorporates the internal temperature of the generator as a reference temperature. Based on the internal temperature of the generator, this control method can monitor the changes in the heat supply on the heating side of the refrigeration unit in real time, preventing potential cooling capacity fluctuations caused by fluctuations in the heating supply. Furthermore, the control method can determine the cooling load status of the refrigeration unit based on the internal temperature of the generator or the heat balance equation, and adjust the control parameters of the refrigeration unit to effectively reduce or eliminate fluctuations in the chilled water outlet temperature. Compared with existing technologies, this control method effectively reduces the hysteresis of the overall control process of the refrigeration unit, thereby reducing fluctuations in the chilled water outlet temperature and ensuring the stability of the cooling supply of the refrigeration unit.

[0015] In addition, the control method also provides a heater inside the generator of the refrigeration unit, and can adjust the heating power of the heater according to the refrigeration load status of the refrigeration unit, thereby providing a corresponding degree of heat compensation when fluctuations occur on the heating side, reducing the amplitude of fluctuations on the heating side, thereby narrowing the fluctuation range of the chilled water outlet temperature, and providing support for the refrigeration unit to provide stable cooling to the cold side device. In particular, when the heat supply on the heating side decreases, the heater can neutralize the impact of the decrease in heat supply by increasing its own heating power, thereby improving the stability of the cooling supply of the refrigeration unit.

[0016] Optionally, the generator absorbs heat from the outside through the heat medium water flowing through it, the absorber and the condenser dissipate heat to the outside through the cooling water flowing through them in sequence, the evaporator absorbs heat from the outside through the chilled water flowing through it, and the heater compensates the heat to the generator;

[0017] The heat balance equation is:

[0018] ΔQ=Q 热媒水 +Q 补 +Q e -Q a -Q c =0 (1)

[0019] In formula (1), Q 热媒水 Indicates the heat provided by the heat medium water to the generator;

[0020] Q 补 Indicates the heat provided by the heater to the generator;

[0021] Q e Indicates the heat provided by chilled water to the evaporator;

[0022] Q a Indicates the heat removed from the absorber by the cooling water;

[0023] Q c Indicates the heat removed from the condenser by the cooling water.

[0024] Optionally, the Q 热媒水 , Q 补 , Q e , Q a , Q c Based on formulas (2) to (6), the formulas (2) to (6) are respectively:

[0025]

[0026] Q 补 =εQ 加热器 (3)

[0027]

[0028] In formulas (2) to (6), c represents the specific heat capacity of water, ρ represents the density of water, and v 热媒水 Indicates the flow rate of thermal water flowing through the generator, Indicates the inlet temperature of the heat medium water when it enters the generator; It represents the outlet temperature of the heat medium water when it leaves the generator, ε represents the energy conversion efficiency of the heater, Q 加热器 Indicates the energy consumed by the heater; v e Indicates the flow rate of chilled water flowing through the evaporator, Indicates the chilled water inlet temperature when the chilled water enters the evaporator. Indicates the chilled water outlet temperature when the chilled water leaves the evaporator; v a Indicates the flow rate of cooling water flowing through the absorber, Indicates the first cooling water inlet temperature when the cooling water enters the absorber, Indicates the first cooling water outlet temperature when the cooling water leaves the absorber; v c Indicates the flow rate of cooling water flowing through the condenser, Indicates the second cooling water inlet temperature when the cooling water enters the condenser. Indicates the second cooling water outlet temperature when the cooling water leaves the condenser.

[0029] Optionally, the general control process includes:

[0030] A1. Obtaining the internal temperature of the generator and comparing the internal temperature of the generator with a second temperature threshold.

[0031] If the internal temperature of the generator is lower than the second temperature threshold, execute A2;

[0032] If the internal temperature of the generator is higher than the second temperature threshold, execute A3;

[0033] If the internal temperature of the generator is within the second temperature threshold range, terminating the current general control process;

[0034] A2. Determine whether the current heating power of the heater has reached the limit.

[0035] If so, an early warning signal indicating insufficient cooling load is output;

[0036] If not, increase the heating power of the heater;

[0037] A3. Determine whether the heater is turned on.

[0038] If not, an early warning signal indicating that the cooling load is about to be excessive is output;

[0039] If so, reduce the heating power of the heater.

[0040] Optionally, the cooling shortage control process includes:

[0041] B1. Acquire the internal temperature of the generator and compare the internal temperature of the generator with a second temperature threshold.

[0042] If the internal temperature of the generator is lower than the second temperature threshold, execute B2;

[0043] If the internal temperature of the generator is not lower than the second temperature threshold, execute B3;

[0044] B2. Determine whether the current heating power of the heater has reached the limit.

[0045] If so, an early warning signal indicating insufficient cooling load is output;

[0046] If not, increase the heating power of the heater;

[0047] B3. Calculate the value of ΔQ based on the heat balance equation and compare ΔQ with 0.

[0048] If ΔQ<0, jump to B2;

[0049] If ΔQ>0, determine whether the heater is on. If not, output a warning signal indicating that the cooling load is about to be excessive; if so, reduce the heating power of the heater.

[0050] If ΔQ=0, the current cooling shortage control process ends.

[0051] Optionally, the excess cooling control process includes:

[0052] C1. Acquire the internal temperature of the generator and compare the internal temperature of the generator with a second temperature threshold.

[0053] If the internal temperature of the generator is not lower than the second temperature threshold, execute C2;

[0054] If the internal temperature of the generator is lower than the second temperature threshold, execute C3;

[0055] C2, determine whether the heater is turned on,

[0056] If so, reduce the heating power of the heater;

[0057] If not, output a warning signal indicating that the cooling load is about to be excessive; and / or reduce the flow rate of the heat medium water; and / or initiate a shutdown protection process;

[0058] C3. Calculate the value of ΔQ based on the heat balance equation and compare ΔQ with 0.

[0059] If ΔQ>0, jump to C2;

[0060] If ΔQ<0, determine whether the current heating power of the heater has reached the limit. If so, output a warning signal indicating that the cooling load is about to be insufficient; if not, increase the heating power of the heater.

[0061] If ΔQ=0, the current cooling excess control process ends.

[0062] In a second aspect, an embodiment of the present invention provides a control system for an absorption refrigeration unit based on thermal compensation, wherein the refrigeration unit includes a generator, a condenser, an evaporator, and an absorber, and the control system includes:

[0063] Sensor modules are used to collect real-time data on the heat exchange process between the generator, condenser, evaporator and absorber and the outside world;

[0064] A control module, configured to generate control instructions based on the real-time data collected by the sensor module and in accordance with the control method for the absorption refrigeration unit based on thermal compensation according to the first aspect;

[0065] The heater is arranged inside the generator and is used to adjust its own heating power based on the control instruction and perform corresponding heat compensation on the generator.

[0066] Optionally, the sensor module includes:

[0067] Generator temperature sensor, used to measure the internal temperature of the generator;

[0068] Thermal water flow meter, used to measure the flow rate of thermal water flowing through the generator 热媒水 ;

[0069] Heat transfer water inlet temperature sensor, used to measure the heat transfer water inlet temperature of the generator

[0070] Heat transfer water outlet temperature sensor, used to measure the heat transfer water outlet temperature of the generator

[0071] A cooling water flow meter is used to measure the flow rate of the first cooling water entering the absorber;

[0072] The first cooling water inlet temperature sensor is used to measure the first cooling water inlet temperature of the absorber

[0073] The first cooling water outlet temperature sensor is used to measure the first cooling water outlet temperature of the absorber

[0074] The second cooling water flow meter is used to measure the second cooling water flow v flowing through the condenser c ;

[0075] The second cooling water inlet temperature sensor is used to measure the second cooling water inlet temperature of the condenser

[0076] The second cooling water outlet temperature sensor is used to measure the second cooling water outlet temperature of the condenser

[0077] Chilled water flow meter, used to measure the chilled water flow rate v flowing through the evaporator e ;

[0078] Chilled water inlet temperature sensor, used to measure the chilled water inlet temperature of the evaporator

[0079] Chilled water outlet temperature sensor, used to measure the chilled water outlet temperature of the evaporator

[0080] Optionally, the heater is an electric heater or a gas heater.

[0081] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, it implements the control method of the absorption refrigeration unit based on thermal compensation described in the first aspect.

[0082] (3) Beneficial effects

[0083] The control method and system proposed in embodiments of the present invention determine the cooling load status of the refrigeration unit based on the heat exchange process between the refrigeration unit and the environment, the internal temperature of the generator, and the heat balance equation. Based on this cooling load status, control decisions are generated and the heater is instructed to adjust its compensation heat supply to the refrigeration unit by adjusting its own heating power. In addition to using the chilled water outlet temperature of the refrigeration unit as the controlled parameter, the method provided by the present invention also incorporates the internal temperature of the generator as a reference temperature. Based on the internal temperature of the generator, this control method can monitor the changes in the heat supply on the heating side of the refrigeration unit in real time, preventing potential cooling capacity fluctuations caused by fluctuations in the heating supply. Furthermore, the control method can determine the cooling load status of the refrigeration unit based on the internal temperature of the generator or the heat balance equation, and adjust the control parameters of the refrigeration unit to effectively reduce or eliminate fluctuations in the chilled water outlet temperature. Compared with existing technologies, this control method effectively reduces the hysteresis of the overall control process of the refrigeration unit, thereby reducing fluctuations in the chilled water outlet temperature and ensuring the stability of the cooling supply of the refrigeration unit.

[0084] In addition, the control method also provides a heater inside the generator of the refrigeration unit, and can adjust the heating power of the heater according to the refrigeration load status of the refrigeration unit, thereby providing a corresponding degree of heat compensation when fluctuations occur on the heating side, reducing the amplitude of fluctuations on the heating side, thereby narrowing the fluctuation range of the chilled water outlet temperature, and providing support for the refrigeration unit to provide stable cooling to the cold side device. In particular, when the heat supply on the heating side decreases, the heater can neutralize the impact of the decrease in heat supply by increasing its own heating power, thereby improving the stability of the cooling supply of the refrigeration unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] Figure 1 Schematic diagram of a flow chart of a control method for an absorption refrigeration unit based on heat compensation provided in an embodiment;

[0086] Figure 2 This is a schematic structural diagram of a lithium bromide absorption refrigeration unit in an embodiment;

[0087] Figure 3A schematic diagram of a general control process flow in an embodiment;

[0088] Figure 4 Schematic diagram of the process of controlling insufficient cooling in the embodiment;

[0089] Figure 5 Schematic diagram of the process of excess cooling control in the embodiment. DETAILED DESCRIPTION

[0090] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0091] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0092] Example 1

[0093] This embodiment provides a control method for an absorption refrigeration unit based on thermal compensation. The control method of this embodiment can be implemented on any electronic device, which can specifically be a computer device or a controller.

[0094] Specifically, the absorption refrigeration unit includes a generator, a condenser, an evaporator, and an absorber. The absorption refrigeration unit can be a lithium bromide absorption refrigeration unit or an ammonia absorption refrigeration unit. To facilitate those skilled in the art to understand the control method provided in this embodiment, this embodiment first describes the working principle of the refrigeration unit and the location of the heater:

[0095] like Figure 2As shown, taking a lithium bromide absorption refrigeration unit as an example, the refrigeration principle of the refrigeration unit is as follows: the dilute lithium bromide solution in absorber 1 is pumped out by solution pump 2, heated by heat exchanger 3, and then enters generator 4. In generator 4, the dilute lithium bromide solution is heated by the heat medium water on the heating side through heat transfer pipes, generating refrigerant vapor, and the dilute lithium bromide solution is concentrated into a concentrated solution. The refrigerant vapor generated in generator 4 flows into condenser 5, where it is condensed into refrigerant water by cooling water flowing through condenser 5 through heat transfer pipes. The heat carried by the refrigerant vapor is absorbed by the cooling water and released into the atmosphere. The refrigerant water produced in condenser 5 is throttled by U-shaped tube 6 before entering evaporator 7. Due to the lower pressure inside evaporator 7, some of the refrigerant water entering evaporator 7 flashes back into refrigerant vapor. The remaining refrigerant water, having its heat removed by the flashing portion, cools to saturated refrigerant water and flows into the water pan inside evaporator 7. It is then pumped by refrigerant pump 8 and sprayed onto the heat transfer tubes inside evaporator 7, absorbing heat from the chilled water flowing through them and boiling and evaporating, transforming back into refrigerant vapor. The refrigerant vapor produced by boiling and evaporating in evaporator 7, along with the refrigerant vapor produced by the flashing, enters absorber 1 and is absorbed by the concentrated lithium bromide solution pumped back into absorber 1 from generator 4. The chilled water from the cold side, having its heat removed by the refrigerant water as it flows through evaporator 7, cools in temperature, and then exits the refrigeration unit, returning to the cold side to provide cooling. After absorbing the refrigerant vapor, the concentrated lithium bromide solution in absorber 1 increases in temperature and decreases in concentration, becoming a dilute lithium bromide solution again. This solution is then pumped by solution pump 2 to generator 4 for heating and concentration. Furthermore, absorber 1 is cooled by cooling water flowing through it, preventing the temperature inside absorber 1 from becoming excessively high. This process repeats continuously, allowing evaporator 7 to continuously produce chilled water at the desired temperature.

[0096] Based on the above-mentioned refrigeration unit, this embodiment creatively provides a heater 9 inside the generator 4 for performing heat compensation on the refrigeration unit based on the control method provided in this embodiment.

[0097] like Figure 1 As shown, the control method of this embodiment includes:

[0098] In each preset control cycle, the chilled water outlet temperature of the evaporator is obtained, and the chilled water outlet temperature is compared with the first temperature threshold, and the control process to be executed is determined based on the comparison result. The chilled water outlet temperature is compared with the first temperature threshold here in order to preliminarily determine the current refrigeration load state of the refrigeration unit, so as to select the subsequent control process and make a more detailed judgment on the refrigeration load state of the refrigeration unit. The control cycle can be set according to actual needs. The shorter the cycle, the higher the real-time performance of the control method provided by this embodiment; preferably, the control cycle is 10 seconds to 60 seconds; more preferably, the control cycle is 30 seconds. The first temperature threshold is set according to the preset cooling demand. The lower the first temperature threshold, the greater the cooling demand. Specifically, the control process to be executed determined based on the comparison result includes:

[0099] If the chilled water outlet temperature is within the first temperature threshold range, it indicates that the cooling capacity of the refrigeration unit matches the cooling demand, and the fluctuations experienced by the refrigeration unit mainly come from fluctuations on the heating side. The general control process can be executed to make judgments and adjustments.

[0100] If the chilled water outlet temperature is greater than the first temperature threshold, it indicates that the cooling capacity of the refrigeration unit is less than the cooling demand. The fluctuations experienced by the refrigeration unit may be due to an increase in cooling demand on the cooling side and / or a decrease in heating demand on the heating side. The cooling deficiency control process may be executed for further determination and adjustment.

[0101] If the chilled water outlet temperature is lower than the first temperature threshold, it indicates that the cooling capacity of the refrigeration unit is greater than the cooling demand on the cooling side. The fluctuations experienced by the refrigeration unit may be due to a decrease in cooling demand on the cooling side and / or an increase in heating demand on the heating side. The cooling excess control process may be executed for further judgment and adjustment.

[0102] Among them, the judgment and adjustment process of the insufficient cooling control process, the excessive cooling control process and the general control process is to judge whether the fluctuations borne by the refrigeration unit come from the heating side or the cooling side based on the internal temperature of the generator, and based on the heat exchange process between the refrigeration unit and the outside world, according to the internal temperature of the generator or the heat balance equation, make a precise judgment on the refrigeration load state of the refrigeration unit. Then, based on the refrigeration load state of the refrigeration unit, a control instruction is generated, and the control instruction is at least used to instruct the heater to adjust its own heating power. In addition, the control instruction also includes instructions for instructing the refrigeration unit to adjust other control parameters, such as the control parameters for adjusting the flow rate of the heat medium water flowing through the generator, etc. These instructions for generating and adjusting other control parameters can be implemented through existing technologies. In the above control process, the refrigeration load state of the refrigeration unit essentially refers to the matching relationship between the refrigeration capacity of the refrigeration unit and the cooling demand.

[0103] It should be noted that the aforementioned increase or decrease in heat supply on the heating side typically involves fluctuations in the flow rate and temperature of the heat transfer water, and the impact of this on the refrigeration unit can be collectively referred to as heat supply fluctuation. Similarly, the aforementioned increase or decrease in cooling demand on the cooling side typically involves fluctuations in the flow rate and temperature of the chilled water, and the impact of this on the refrigeration unit can be collectively referred to as cooling demand fluctuation.

[0104] Specifically, the generator absorbs heat from the outside through the heat medium water flowing through it, the absorber and condenser dissipate heat to the outside through the cooling water flowing through them in sequence, the evaporator absorbs heat from the outside through the chilled water flowing through it, and the heater compensates the heat to the generator. Then, the heat balance equation is:

[0105] ΔQ=Q 热媒水 +Q 补 +Q e -Q a -Q c =0 (1)

[0106] In formula (1), Q 热媒水 Indicates the heat provided by the heat medium water to the generator;

[0107] Q 补 Indicates the heat provided by the heater to the generator;

[0108] Q e Indicates the heat provided by chilled water to the evaporator;

[0109] Q a Indicates the heat removed from the absorber by the cooling water;

[0110] Q c Indicates the heat removed from the condenser by the cooling water.

[0111] When ΔQ=0, it means that the heat currently received by the refrigeration unit (including the heat provided by the heat medium water and the heat provided by the heater), that is, the cooling load of the refrigeration unit, matches the current cooling demand on the cooling side; when ΔQ>0, it means that the cooling load of the refrigeration unit is greater than the cooling demand on the cooling side. If it is not adjusted in time, there will be an excess cooling load; when ΔQ<0, it means that the cooling load of the refrigeration unit is less than the cooling demand on the cooling side. If it is not adjusted in time, there will be an insufficient cooling load.

[0112] More specifically, the Q 热媒水 , Q 补 , Q e , Q a , Q c Based on formulas (2) to (6), the formulas (2) to (6) are respectively:

[0113]

[0114] Q 补 =εQ 加热器 (3)

[0115]

[0116] In formulas (2) to (6), c represents the specific heat capacity of water, ρ represents the density of water, and v 热媒水 Indicates the flow rate of thermal water flowing through the generator, Indicates the inlet temperature of the heat medium water when it enters the generator; It represents the outlet temperature of the heat medium water when it leaves the generator, ε represents the energy conversion efficiency of the heater, Q 加热器 Indicates the energy consumed by the heater; v e Indicates the flow rate of chilled water flowing through the evaporator, Indicates the chilled water inlet temperature when the chilled water enters the evaporator. Indicates the chilled water outlet temperature when the chilled water leaves the evaporator; v a Indicates the flow rate of cooling water flowing through the absorber, Indicates the first cooling water inlet temperature when the cooling water enters the absorber, Indicates the first cooling water outlet temperature when the cooling water leaves the absorber; v c Indicates the flow rate of cooling water flowing through the condenser, Indicates the second cooling water inlet temperature when the cooling water enters the condenser. Indicates the second cooling water outlet temperature when the cooling water leaves the condenser.

[0117] The control method provided in this embodiment, in addition to using the chilled water outlet temperature of the refrigeration unit as the controlled parameter, also adds a reference temperature point, the internal temperature of the generator. Based on the internal temperature of the generator, this control method can understand the changes in the heat supply on the heating side of the refrigeration unit in real time, prevent potential fluctuations in cooling capacity caused by fluctuations in the heat supply on the heating side, and can determine the cooling load status of the refrigeration unit based on the internal temperature of the generator or the heat balance equation, adjust the control parameters of the refrigeration unit, and effectively reduce or eliminate fluctuations in the chilled water outlet temperature. Compared with the existing technology, this control method effectively reduces the hysteresis of the overall adjustment process of the refrigeration unit, thereby reducing fluctuations in the chilled water outlet temperature, thereby ensuring the stability of the cooling supply of the refrigeration unit.

[0118] In addition, the control method also provides a heater inside the generator of the refrigeration unit, and can adjust the heating power of the heater according to the refrigeration load status of the refrigeration unit, thereby providing a corresponding degree of heat compensation when fluctuations occur on the heating side, reducing the amplitude of fluctuations on the heating side, thereby narrowing the fluctuation range of the chilled water outlet temperature, and providing support for the refrigeration unit to provide stable cooling to the cold side device. In particular, when the heat supply on the heating side decreases, the heater can neutralize the impact of the decrease in heat supply by increasing its own heating power, thereby improving the stability of the cooling supply of the refrigeration unit.

[0119] Example 2

[0120] In order to better understand the first embodiment, this embodiment is described in detail with reference to specific steps.

[0121] The control method provided in this embodiment performs the following steps in each preset control cycle:

[0122] S1. Obtain the chilled water outlet temperature of the evaporator.

[0123] S2. Compare the chilled water outlet temperature with the first temperature threshold.

[0124] If the chilled water outlet temperature is within the first temperature threshold range, executing the general control process;

[0125] If the chilled water outlet temperature is greater than the first temperature threshold, executing the cooling shortage control process;

[0126] If the chilled water outlet temperature is lower than the first temperature threshold, the cooling excess control process is executed.

[0127] The insufficient cooling control process, excess cooling control process, and general control process determine whether the fluctuations experienced by the refrigeration unit are from the heating side or the cooling side based on the internal temperature of the generator. Based on the heat exchange process between the refrigeration unit and the outside world, the internal temperature of the generator or the heat balance equation are used to precisely determine the refrigeration load state of the refrigeration unit and make control decisions. It should be noted that in addition to the following adjustments to the heater power, the heat medium water flow rate, and the early warning signals, these control decisions may also include other control information generated through existing technologies to ensure the stable operation of the refrigeration unit.

[0128] The following describes in detail the cooling deficiency control process, the cooling excess control process and the general control process.

[0129] General control process:

[0130] When the general control process is executed after the preliminary judgment in step S2 in a control cycle, it indicates that the cooling capacity of the refrigeration unit matches the cooling demand, and the refrigeration unit only needs to adjust according to the fluctuation of the heating side. Figure 3 As shown, the general control process includes the following sub-steps:

[0131] A1. Obtain the internal temperature of the generator and compare the internal temperature of the generator with the second temperature threshold to determine whether the heat supply on the heating side has fluctuated. The second temperature threshold is usually the temperature range when the generator is working normally, and its specific value can be set according to the specific refrigeration unit. Based on the comparison result of A1,

[0132] If the internal temperature of the generator is lower than the second temperature threshold, it indicates that the heat supply on the heating side has decreased, and A2 is executed for adjustment;

[0133] If the internal temperature of the generator is higher than the second temperature threshold, it indicates that the heat supply on the heating side has increased, and A3 is executed for adjustment;

[0134] If the internal temperature of the generator is within the second temperature threshold range, it indicates that the heat currently received by the refrigeration unit matches the cooling demand. There is no need to adjust the control parameters of the refrigeration unit, and the current general control process is directly ended.

[0135] A2. Determine whether the current heating power of the heater has reached the limit. Based on the known decrease in the heat supply on the heating side in step A1, the heating power of the heater should be increased to compensate for the decrease in heat supply. Based on the judgment result of A2,

[0136] If so, it means that the heat fully compensated by the heater cannot offset the decrease in heat on the heating side, and the cooling load of the refrigeration unit will soon be unable to meet the cooling demand on the cooling side. Therefore, an early warning signal that the cooling load is about to be insufficient is output, so that the user can take countermeasures in advance; specifically, the early warning signal can be text information, picture information or sound and light alarm information.

[0137] If not, it means that the heater has not completely offset the fluctuation caused by the decrease in heat supply on the heating side under the current heating power, so the heating power of the heater is increased to increase the heat compensation of the heater to the generator.

[0138] A3. Determine whether the heater is on. Based on the known increase in the heat supply on the heating side in step A1, the heating power of the heater should be reduced to reduce the heat received by the entire refrigeration unit, thereby preventing the refrigeration unit from having an excessive cooling load. Based on the judgment result of A3,

[0139] If not, it means that the heat supply on the heating side is too high. Even if the heater is turned off, the cooling capacity of the refrigeration unit will still exceed the cooling demand. Therefore, an early warning signal of excessive cooling load is output to facilitate users to take countermeasures in advance.

[0140] If so, it means that the heat compensated by the heater at the current heating power is higher than the actual demand of the refrigeration unit, so the heating power of the heater is reduced to match the cooling capacity of the refrigeration unit with the cooling demand.

[0141] Insufficient cooling control process:

[0142] When the cooling shortage control process is executed after the preliminary determination in step S2 during a control cycle, it indicates that the cooling capacity of the refrigeration unit is less than the cooling demand. The fluctuations experienced by the refrigeration unit may come from an increase in cooling demand on the cooling side or a decrease in heating demand on the heating side. It is necessary to first determine the source of the fluctuations before making a control decision. Specifically, Figure 4 As shown, the cooling shortage control process includes the following sub-steps:

[0143] B1. Obtaining the internal temperature of the generator and comparing the internal temperature of the generator with a second temperature threshold. Based on the comparison result,

[0144] If the internal temperature of the generator is lower than the second temperature threshold, it means that the fluctuation is caused by the decrease in the heat supply on the heating side, and B2 is executed for adjustment;

[0145] If the internal temperature of the generator is not lower than the second temperature threshold, it means that the fluctuation is from the cold side. Execute B3 to make judgment and adjustment.

[0146] B2. Determine whether the current heating power of the heater has reached the limit. Based on the known decrease in the heat supply on the heating side in step B1, the heating power of the heater should be increased to compensate for the decrease in heat supply. Based on the judgment result of B2,

[0147] If so, it means that the full compensation heat of the heater cannot offset the decrease in heat on the heating side. The cooling load of the refrigeration unit will soon be unable to meet the cooling demand on the cooling side. Therefore, an early warning signal of insufficient cooling load is output, so that users can take countermeasures in advance.

[0148] If not, it means that the heater has not completely offset the fluctuation caused by the decrease in heat supply on the heating side under the current heating power, so the heating power of the heater is increased to increase the heat compensation of the heater to the generator.

[0149] B3. Calculate the value of ΔQ based on the heat balance equation and compare ΔQ with 0. Based on step B1, it is known that the fluctuation comes from the cooling side, that is, the cooling demand on the cooling side has changed. Therefore, it is necessary to determine whether the current cooling capacity of the refrigeration unit matches the new cooling demand. Based on the comparison result of B3,

[0150] If ΔQ<0, it means that the current cooling capacity of the refrigeration unit is less than the new cooling demand, and jump to B2 for adjustment;

[0151] If ΔQ > 0, the refrigeration unit's current cooling capacity exceeds the new cooling demand, and the heater's heating power should be reduced to lower the unit's cooling capacity. The specific adjustment steps are: Determine whether the heater is on. If not, the heating supply is too high. Even if the heater is turned off, the refrigeration unit's cooling capacity will still exceed the cooling demand. Therefore, a warning signal indicating an impending cooling load overload is output, allowing the user to take preemptive measures. If not, the heater's heating power is reduced to match the refrigeration unit's cooling capacity to the cooling demand.

[0152] If ΔQ=0, it means that although the cooling demand has fluctuated, the current cooling capacity of the refrigeration unit matches the new cooling demand. There is no need to adjust the control parameters of the refrigeration unit, and the current cooling shortage control process is directly ended.

[0153] Excess cooling control process:

[0154] When the cooling excess process is executed after the preliminary determination in step S2 during a control cycle, it indicates that the cooling capacity of the refrigeration unit is greater than the cooling demand on the cooling side. The fluctuations experienced by the refrigeration unit may come from a decrease in cooling demand on the cooling side or an increase in heating demand on the heating side. It is necessary to first determine the source of the fluctuations before making a control decision. Figure 5 As shown, the refrigeration excess control process includes the following sub-steps:

[0155] C1. Acquire the internal temperature of the generator and compare the internal temperature of the generator with a second temperature threshold. Based on the comparison result,

[0156] If the internal temperature of the generator is not lower than the second temperature threshold, it indicates that the fluctuation is caused by the increase in the heat supply on the heating side, and C2 is executed for adjustment;

[0157] If the internal temperature of the generator is lower than the second temperature threshold, it indicates that the fluctuation comes from the cold side, and C3 is executed for judgment and adjustment.

[0158] C2, determine whether the heater is turned on. Based on the known increase in the heat supply on the heating side in step C1, the heating power of the heater should be reduced or the flow rate of the heat medium water should be reduced to neutralize the increased heat supply. Based on the judgment result of C2,

[0159] If yes, it means that the heat compensated by the heater under the current heating power is higher than the actual demand of the refrigeration unit, so the heating power of the heater is reduced to make the cooling capacity of the refrigeration unit match the cooling demand;

[0160] If not, it means that the heat supply on the heating side is too high. Even if the heater is turned off, the cooling capacity of the refrigeration unit will still be greater than the cooling demand. Therefore, an early warning signal of the upcoming excess cooling load is output to facilitate users to take countermeasures in advance. In addition, the heat supply to the refrigeration unit from the heating side can be reduced by reducing the flow of heat transfer water to reduce the cooling capacity of the refrigeration unit. In particular, a downtime protection process can also be started to prevent the refrigeration unit from shutting down and causing damage to the unit equipment. The downtime protection process is a prior art, which can be specifically as follows: first, gradually close the heat transfer water inlet valve to put the refrigeration unit into a dilution operation state; after 3-5 minutes, turn off the cooling tower fan, close the cooling water pump outlet valve, and then stop the cooling water pump; after the dilution operation of the refrigeration unit stops, close the chilled water pump outlet valve in sequence, stop the chilled water pump, and finally cut off the power supply to the refrigeration unit control box, and the equipment stops running.

[0161] C3, calculate the value of ΔQ based on the heat balance equation and compare ΔQ with 0. Based on the known fluctuation from step C1, it is necessary to determine whether the current cooling capacity of the refrigeration unit matches the new cooling demand. Based on the comparison result of C3,

[0162] If ΔQ>0, it means that the current cooling capacity of the refrigeration unit is greater than the new cooling demand, and jump to C2 for adjustment.

[0163] If ΔQ < 0, the refrigeration unit's current cooling capacity is less than the new cooling demand, and the heater's heating power should be increased to compensate for the increased cooling demand. The specific adjustment steps are: Determine whether the heater's current heating power has reached its limit. If so, the full compensation heat from the heater cannot offset the decrease in heat on the heating side, and the refrigeration unit's cooling load is about to fail to meet the cooling demand on the cooling side. Therefore, a warning signal indicating impending cooling load insufficiency is output, allowing the user to take preemptive measures. If not, the heater's heating power is increased to increase the heater's heat compensation for the generator.

[0164] If ΔQ=0, it means that although the cooling demand has fluctuated, the current cooling capacity of the refrigeration unit matches the new cooling demand. There is no need to adjust the control parameters of the refrigeration unit, and the current cooling excess control process is directly ended.

[0165] It should be noted that in the aforementioned cooling deficiency control process, cooling excess control process, and general control process, the adjustment operation for increasing or decreasing the heater's heating power can be specifically performed by pre-dividing the heater's rated heating power range into multiple heating levels according to a certain gradient. If the heater needs to increase its heating power, the level is increased by one level based on the heater's current heating level; if the heater needs to decrease its heating power, the level is decreased by one level based on the heater's current heating level. Accordingly, the lowest heating level indicates that the heater is off, and the highest heating level indicates that the heater's heating power has reached its maximum.

[0166] Based on the sub-steps of the above-mentioned insufficient cooling control process, excessive cooling control process, and general control process, it can be seen that the control method provided in this embodiment essentially first makes a preliminary judgment on the cooling load status of the refrigeration unit based on the chilled water outlet temperature. If it is determined that the cooling load is mismatched, it is then determined based on the internal temperature of the generator whether the fluctuation causing the cooling load mismatch is from the heating fluctuation on the heating side or from the cooling demand on the cooling side. If the fluctuation is from the heating fluctuation on the heating side, the heating fluctuation is compensated by adjusting the flow rate of the heater and / or the heat transfer water. If the fluctuation is from the demand fluctuation on the cooling side, the heat balance equation is used to calculate whether the cooling capacity produced by the refrigeration unit based on the current heat received matches the new cooling demand. If so, there is no need to adjust the control parameters of the refrigeration unit. The refrigeration unit will return the chilled water outlet temperature to the first temperature threshold range based on the heat currently provided by the heating side. If not, the demand fluctuation is compensated by adjusting the flow rate of the heater and / or the heat transfer water.

[0167] Example 3

[0168] This embodiment also provides a control system for an absorption refrigeration unit based on thermal compensation, which is used to control the refrigeration process of the refrigeration unit based on the control method provided in embodiment 1 or 2. The control system includes:

[0169] The control module is configured to generate control instructions and / or output a warning signal based on the real-time data collected by the sensor module and in accordance with the control method for an absorption refrigeration unit based on thermal compensation described in Embodiment 1 or 2. The control module may be a controller or a computer device.

[0170] The heater is disposed inside the generator and is used to adjust its own heating power based on the control instruction to perform corresponding heat compensation on the generator. The heater can be an electric heater or a gas heater.

[0171] The sensor module is used to collect real-time data on the heat exchange process between the generator, condenser, evaporator and absorber and the outside world.

[0172] Specifically, the sensor module includes:

[0173] Generator temperature sensor, used to measure the internal temperature of the generator;

[0174] Thermal water flow meter, used to measure the flow rate of thermal water flowing through the generator 热媒水 ;

[0175] Heat transfer water inlet temperature sensor, used to measure the heat transfer water inlet temperature of the generator

[0176] Heat transfer water outlet temperature sensor, used to measure the heat transfer water outlet temperature of the generator

[0177] Cooling water flow meter, used to measure the first cooling water flow v entering the absorber a ;

[0178] The first cooling water inlet temperature sensor is used to measure the first cooling water inlet temperature of the absorber

[0179] The first cooling water outlet temperature sensor is used to measure the first cooling water outlet temperature of the absorber

[0180] The second cooling water flow meter is used to measure the second cooling water flow v flowing through the condenser c ;

[0181] The second cooling water inlet temperature sensor is used to measure the second cooling water inlet temperature of the condenser

[0182] The second cooling water outlet temperature sensor is used to measure the second cooling water outlet temperature of the condenser

[0183] Chilled water flow meter, used to measure the chilled water flow rate v flowing through the evaporator e ;

[0184] Chilled water inlet temperature sensor, used to measure the chilled water inlet temperature of the evaporator

[0185] Chilled water outlet temperature sensor, used to measure the chilled water outlet temperature of the evaporator

[0186] On the other hand, this embodiment also provides a computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by the processor, it implements the control method of the absorption refrigeration unit based on thermal compensation described in Example 1 or 2.

[0187] Since the systems / devices described in the above embodiments of the present invention are systems / devices used to implement the methods of the above embodiments of the present invention, those skilled in the art will be able to understand the specific structures and variations of these systems / devices based on the methods described in the above embodiments of the present invention, and thus will not be described in detail here. All systems / devices used in the methods of the above embodiments of the present invention are within the scope of protection of the present invention.

[0188] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0189] The present invention is described with reference to flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions.

[0190] It should be noted that, in the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In claims enumerating several means, several of these means may be embodied by one and the same hardware. The use of the words first, second, third etc. is for convenience only and does not indicate any order. These words may be understood as part of the component name.

[0191] In addition, it should be noted that, in the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0192] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments after learning the basic creative concept. Therefore, the claims should be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0193] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims and their equivalents, the present invention shall also include such modifications and variations.

Claims

1. A control method for an absorption refrigeration unit based on heat compensation, wherein the refrigeration unit comprises a generator, a condenser, an evaporator and an absorber, characterized in that: A heater is provided inside the generator, and the heater is used to perform heat compensation on the refrigeration unit; the control method includes: In each preset control cycle, the chilled water outlet temperature of the evaporator is obtained and compared with the first temperature threshold. If the chilled water outlet temperature is within the first temperature threshold range, executing the general control process; If the chilled water outlet temperature is greater than the first temperature threshold, executing the cooling shortage control process; If the chilled water outlet temperature is lower than the first temperature threshold, executing the cooling excess control process; The insufficient cooling control process, the excessive cooling control process, and the general control process are configured to determine the cooling load state of the refrigeration unit based on the heat exchange process between the refrigeration unit and the outside world, according to the internal temperature of the generator or the heat balance equation; and to generate a control instruction based on the cooling load state of the refrigeration unit, the control instruction being configured to at least instruct the heater to adjust its own heating power. The insufficient cooling control process, the excessive cooling control process and the general control process determine, based on the internal temperature of the generator, whether the fluctuation that causes the cooling load mismatch comes from the heating fluctuation on the heating side or from the cooling demand on the cooling side; if the fluctuation is the heating fluctuation from the heating side, the heating fluctuation is compensated by adjusting the flow rate of the heater and / or the heat transfer water; if the fluctuation is the demand fluctuation on the cooling side, the heat balance equation is used to calculate whether the cooling capacity produced by the refrigeration unit based on the currently received heat matches the new cooling demand; if not, the demand fluctuation is compensated by adjusting the flow rate of the heater and / or the heat transfer water.

2. The control method according to claim 1, characterized in that: The generator absorbs heat from the outside through the heat medium water flowing through it, the absorber and condenser dissipate heat to the outside through the cooling water flowing through them in sequence, the evaporator absorbs heat from the outside through the chilled water flowing through it, and the heater compensates the heat to the generator; The heat balance equation is: ΔQ=Q 热媒水 +Q 补 +Q e -Q a -Q c =0 (1) In formula (1), Q 热媒水 Indicates the heat provided by the heat medium water to the generator; Q 补 Indicates the heat provided by the heater to the generator; Q e Indicates the heat provided by chilled water to the evaporator; Q a Indicates the heat removed from the absorber by the cooling water; Q c Indicates the heat removed from the condenser by the cooling water.

3. The control method according to claim 2, characterized in that: The Q 热媒水 , Q 补 , Q e , Q a , Q c Based on formulas (2) to (6), the formulas (2) to (6) are respectively: Q 补 =εQ 加热器 (3) In formulas (2) to (6), c represents the specific heat capacity of water, ρ represents the density of water, and v 热媒水 Indicates the flow rate of thermal water flowing through the generator, Indicates the inlet temperature of the heat medium water when it enters the generator; It represents the outlet temperature of the heat medium water when it leaves the generator, ε represents the energy conversion efficiency of the heater, Q 加热器 Indicates the energy consumed by the heater; v e Indicates the flow rate of chilled water flowing through the evaporator, Indicates the chilled water inlet temperature when the chilled water enters the evaporator. Indicates the chilled water outlet temperature when the chilled water leaves the evaporator; v a Indicates the flow rate of cooling water flowing through the absorber, Indicates the first cooling water inlet temperature when the cooling water enters the absorber, Indicates the first cooling water outlet temperature when the cooling water leaves the absorber; v c Indicates the flow rate of cooling water flowing through the condenser, Indicates the second cooling water inlet temperature when the cooling water enters the condenser. Indicates the second cooling water outlet temperature when the cooling water leaves the condenser.

4. The control method according to claim 2, characterized in that: The general control process includes: A1. Obtaining the internal temperature of the generator and comparing the internal temperature of the generator with a second temperature threshold. If the internal temperature of the generator is lower than the second temperature threshold, execute A2; If the internal temperature of the generator is higher than the second temperature threshold, execute A3; If the internal temperature of the generator is within the second temperature threshold range, terminating the current general control process; A2. Determine whether the current heating power of the heater has reached the limit. If so, an early warning signal indicating insufficient cooling load is output; If not, increase the heating power of the heater; A3. Determine whether the heater is turned on. If not, an early warning signal indicating that the cooling load is about to be excessive is output; If so, reduce the heating power of the heater.

5. The control method according to claim 2, characterized in that: The cooling shortage control process includes: B1. Acquire the internal temperature of the generator and compare the internal temperature of the generator with a second temperature threshold. If the internal temperature of the generator is lower than the second temperature threshold, execute B2; If the internal temperature of the generator is not lower than the second temperature threshold, execute B3; B2. Determine whether the current heating power of the heater has reached the limit. If so, an early warning signal indicating insufficient cooling load is output; If not, increase the heating power of the heater; B3. Calculate the value of ΔQ based on the heat balance equation and compare ΔQ with 0. If ΔQ<0, jump to B2; If ΔQ>0, determine whether the heater is on. If not, output a warning signal indicating that the cooling load is about to be excessive; if so, reduce the heating power of the heater. If ΔQ=0, the current cooling shortage control process ends.

6. The control method according to claim 2, characterized in that: The excess cooling control process includes: C1. Acquire the internal temperature of the generator and compare the internal temperature of the generator with a second temperature threshold. If the internal temperature of the generator is not lower than the second temperature threshold, execute C2; If the internal temperature of the generator is lower than the second temperature threshold, execute C3; C2, determine whether the heater is turned on, If so, reduce the heating power of the heater; If not, output a warning signal indicating that the cooling load is about to be excessive; and / or reduce the flow rate of the heat medium water; and / or initiate a shutdown protection process; C3. Calculate the value of ΔQ based on the heat balance equation and compare ΔQ with 0. If ΔQ>0, jump to C2; If ΔQ<0, determine whether the current heating power of the heater has reached the limit. If so, output a warning signal indicating that the cooling load is about to be insufficient; if not, increase the heating power of the heater. If ΔQ=0, the current cooling excess control process ends.

7. A control system for an absorption refrigeration unit based on thermal compensation, wherein the refrigeration unit comprises a generator, a condenser, an evaporator and an absorber, characterized in that: The control system includes: Sensor modules are used to collect real-time data on the heat exchange process between the generator, condenser, evaporator and absorber and the outside world; A control module, configured to generate a control instruction based on the real-time data collected by the sensor module and in accordance with the control method for an absorption refrigeration unit based on thermal compensation according to any one of claims 1 to 6; The heater is arranged inside the generator and is used to adjust its own heating power based on the control instruction and perform corresponding heat compensation on the generator.

8. The control system according to claim 7, characterized in that: The sensor module includes: Generator temperature sensor, used to measure the internal temperature of the generator; Thermal medium water flow meter, used to measure the flow of thermal medium water flowing through the generator; The heat medium water inlet temperature sensor is used to measure the heat medium water inlet temperature of the generator; The heat medium water outlet temperature sensor is used to measure the heat medium water outlet temperature of the generator; A cooling water flow meter is used to measure the flow rate of the first cooling water entering the absorber; A first cooling water inlet temperature sensor is used to measure the first cooling water inlet temperature of the absorber; A first cooling water outlet temperature sensor is used to measure the first cooling water outlet temperature of the absorber; A second cooling water flow meter is used to measure the flow rate of the second cooling water flowing through the condenser; A second cooling water inlet temperature sensor is used to measure the second cooling water inlet temperature of the condenser; A second cooling water outlet temperature sensor is used to measure the second cooling water outlet temperature of the condenser; Chilled water flow meter, used to measure the chilled water flow through the evaporator; Chilled water inlet temperature sensor, used to measure the chilled water inlet temperature of the evaporator; The chilled water outlet temperature sensor is used to measure the chilled water outlet temperature of the evaporator.

9. The control system according to claim 7, characterized in that The heater is an electric heater or a gas heater.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the control method of the absorption refrigeration unit based on heat compensation according to any one of claims 1 to 6 is implemented.

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