A heat exchange performance monitoring system and method for heat exchanger

Abstract

The present invention relates to the technical field of heat exchanger performance monitoring, and discloses a heat exchanger heat exchange performance monitoring system and method. The heat exchanger heat exchange performance monitoring system and method collect the external environment temperature data and wind speed data of the heat exchanger, and calculate the environment influence coefficient on heat exchange according to these data. At the same time, collect the fluid temperature at the heat exchange pipe inlet of the heat exchanger, the fluid temperature at the heat exchange pipe outlet of the heat exchanger, the heat exchange pipe inlet fluid pressure and the heat exchange pipe outlet fluid pressure, combine the heat exchange coefficient of the heat exchanger and the environment influence coefficient on heat exchange to calculate the heat transfer coefficient under the current environment, and calculate the heat transfer of the current heat exchanger according to the coefficient, calculate the heat transfer efficiency according to the current heat transfer of the heat exchanger and the design heat of the heat exchanger, judge whether the heat exchanger is abnormal according to the heat transfer efficiency, and judge whether the heat exchange efficiency of the heat exchanger is abnormal according to the environmental factors of the heat exchanger, thereby improving the accuracy of the results and reducing the probability of misjudgment.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchanger performance monitoring, and in particular to a system and method for monitoring the heat exchange performance of a heat exchanger. Background Art

[0002] A heat exchanger is a device that transfers heat between two or more fluids through heat conduction and convection. It is widely used in HVAC, chemical industry, petroleum and other fields in industry and daily life to improve energy efficiency and achieve temperature control. Common types include shell and tube, plate and double-tube heat exchangers. Heat exchangers are of great significance in improving the energy utilization rate of the system, reducing energy consumption and protecting the environment.

[0003] At present, it is usually necessary to install sensors in the heat exchanger to monitor the heat exchange performance of the heat exchanger and determine whether the heat exchange performance of the heat exchanger is abnormal. However, the efficiency of the heat exchanger will be affected by the external environment, which will cause the final detection value of the heat exchange performance of the heat exchanger to deviate, resulting in inaccurate results and increasing the chance of misjudgment. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a system and method for monitoring the heat exchange performance of a heat exchanger, which has the advantages of improving the accuracy of the results, reducing the probability of misjudgment, and solving the above-mentioned problems.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solution: a method for monitoring the heat exchange performance of a heat exchanger, comprising the following steps:

[0008] S1. Collecting the external ambient temperature data and wind speed data of the heat exchanger, obtaining the fluid temperature at the inlet of the heat exchange pipe of the heat exchanger, the fluid temperature at the outlet of the heat exchange pipe of the heat exchanger, the fluid pressure at the inlet of the heat exchange pipe, and the fluid pressure at the outlet of the heat exchange pipe;

[0009] S2. Calculate the inlet and outlet fluid temperature difference according to the fluid temperature at the inlet of the heat exchange pipe of the heat exchanger and the fluid temperature at the outlet of the heat exchange pipe of the heat exchanger, and calculate the mass flow rate according to the inlet fluid pressure of the heat exchange pipe, the outlet fluid pressure of the heat exchange pipe, the density of the known fluid and the cross-sectional area of ​​the heat exchange pipe;

[0010] S3, calculating the heat transferred by the heat exchanger according to the temperature difference and mass flow rate of the inlet and outlet fluids;

[0011] S4. Calculate the influence coefficient of the environment on heat transfer according to the external environment temperature data and wind speed data;

[0012] S5. Calculate the fluid flow rate according to the cross-sectional area of ​​the heat exchange pipe, the mass flow rate and the density of the known fluid, and calculate the heat transfer coefficient of the heat exchanger according to the fluid flow rate;

[0013] S6. Calculating the heat transfer coefficient of the heat exchanger under the current environment according to the heat transfer coefficient and the heat transfer influence coefficient of the heat exchanger, and calculating the heat transfer amount of the heat exchanger according to the heat transfer coefficient;

[0014] S7. After the heat transfer of the heat exchanger is calculated, the heat transfer efficiency is calculated by combining it with the designed heat transfer of the heat exchanger, and whether the heat transfer performance is abnormal is determined based on the heat transfer efficiency. When an abnormality occurs, an early warning prompt is issued.

[0015] Preferably, the external ambient temperature data is represented as Ww, the wind speed data is represented as Wf, the fluid temperature at the inlet of the heat exchange pipe is represented as Jw, the fluid temperature at the outlet of the heat exchanger heat exchange pipe is represented as Cw, the fluid pressure at the inlet of the heat exchange pipe is represented as Jy, and the fluid pressure at the outlet of the heat exchange pipe is represented as Cy.

[0016] Preferably, the calculation expression of the inlet and outlet fluid temperature difference is as follows:

[0017] ΔWC=Cw-Jw

[0018] In the formula, ΔWC represents the temperature difference between the inlet and outlet fluids;

[0019] The mass flow calculation expression is as follows:

[0020]

[0021] In the formula, lx represents the flow coefficient, (Cy-Jy) represents the difference between the fluid pressure at the outlet of the heat exchange pipe and the fluid pressure at the inlet of the heat exchange pipe, md represents the density of the known fluid, Jm represents the cross-sectional area of ​​the heat exchange pipe, and L represents the mass flow rate.

[0022] Preferably, the heat transfer calculation expression of the heat exchanger is as follows:

[0023] CR=L*br*ΔWC

[0024] In the formula, CR represents the heat transferred by the heat exchanger, and br represents the specific heat capacity per unit mass of fluid at constant pressure, which is a known value.

[0025] Preferably, the calculation expression of the environment influence coefficient on heat transfer is as follows:

[0026]

[0027] In the formula, Cw-Ww represents the temperature difference between the fluid temperature at the outlet of the heat exchanger heat exchange pipe and the external ambient temperature data. represents the power exponent, and hyx represents the coefficient of influence of environment on heat transfer.

[0028] Preferably, the fluid flow rate calculation expression is as follows:

[0029]

[0030] In the formula, md*Jm represents the mass of fluid carried by each unit size of the cross-sectional area Jm per unit time. The mass flow rate is expressed as the mass of fluid carried per unit size of the cross-sectional area Jm per unit time, and the fluid flow rate is expressed as ls.

[0031] Preferably, the heat exchange coefficient calculation expression of the heat exchanger is as follows:

[0032]

[0033] In the formula, cd represents the length of the heat exchanger heat exchange pipe, μ represents the dynamic viscosity of the fluid, and hr represents the heat transfer coefficient of the heat exchanger. The length cd of the heat exchanger heat exchange pipe is determined by the heat exchangers of different specifications, and the dynamic viscosity μ of the fluid is determined by the type of fluid. Both are known values.

[0034] Preferably, the heat transfer coefficient calculation expression under the current environment is as follows:

[0035]

[0036] In the formula, represents the heat transfer resistance inside the heat exchanger, represents the heat transfer resistance outside the heat exchanger, It represents the sum of the heat transfer resistance inside the heat exchanger and the heat transfer resistance outside the heat exchanger, that is, the total thermal resistance. It represents the amount of heat passing through the cross-sectional area Jm per unit time, and crx represents the heat transfer coefficient under the current environment;

[0037] The heat transfer calculation expression of the heat exchanger is as follows:

[0038] Rl=crx*jm*ΔWC

[0039] In the formula, crx*jm*ΔWC is the heat transfer capacity of the heat exchanger under the current ambient temperature and wind speed, that is, the heat transfer amount of the heat exchanger, and the heat transfer amount of the heat exchanger is expressed as Rl.

[0040] Preferably, the heat transfer efficiency calculation expression is as follows:

[0041]

[0042] In the formula, ll represents the design heat transfer capacity of the heat exchanger. It represents the ratio of the heat transfer amount of the heat exchanger to the designed heat transfer amount of the heat exchanger, that is, the heat transfer efficiency, and rxl represents the heat transfer efficiency.

[0043] A heat exchange performance monitoring system for a heat exchanger, comprising a heat exchanger internal data acquisition unit, a heat exchanger external data acquisition unit, a data processing unit and an early warning unit;

[0044] The internal data acquisition unit of the heat exchanger is used to obtain the fluid temperature at the inlet of the heat exchange pipe of the heat exchanger, the fluid temperature at the outlet of the heat exchange pipe of the heat exchanger, the fluid pressure at the inlet of the heat exchange pipe and the fluid pressure at the outlet of the heat exchange pipe;

[0045] The heat exchanger external data acquisition unit is used to collect the external environment temperature data and wind speed data of the heat exchanger;

[0046] The heat exchanger internal data acquisition unit and the heat exchanger external data acquisition unit send the collected data to the data processing unit;

[0047] The data processing unit is used to process the collected data to obtain the heat transfer efficiency, and judge whether the heat exchange performance of the heat exchanger is abnormal according to the calculated heat transfer efficiency. When the heat transfer efficiency is abnormal, it is judged that the heat exchange performance of the heat exchanger is abnormal, and an abnormal signal is generated and sent to the early warning unit;

[0048] After receiving the abnormal signal, the early warning unit issues an alarm.

[0049] Compared with the prior art, the present invention provides a system and method for monitoring the heat exchange performance of a heat exchanger, which has the following beneficial effects:

[0050] The present invention collects the external environmental temperature data and wind speed data of the heat exchanger, and calculates the environmental influence coefficient on heat exchange based on these data. At the same time, the fluid temperature at the inlet of the heat exchange pipe of the heat exchanger, the fluid temperature at the outlet of the heat exchange pipe of the heat exchanger, the fluid pressure at the inlet of the heat exchange pipe and the fluid pressure at the outlet of the heat exchange pipe are collected, and the heat transfer coefficient of the heat exchanger is calculated based on these data. The heat transfer coefficient of the heat exchanger and the environmental influence coefficient on heat exchange are combined to calculate the heat transfer coefficient under the current environment, and the heat transfer amount of the current heat exchanger is calculated based on the coefficient. The heat transfer efficiency is calculated based on the current heat transfer amount of the heat exchanger and the design heat amount of the heat exchanger. Whether the heat exchanger is abnormal is judged based on the heat transfer efficiency. Therefore, whether the heat exchange efficiency of the heat exchanger is abnormal can be judged based on the environmental factors in which the heat exchanger is located, thereby improving the accuracy of the result and reducing the probability of misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the steps of the method of the present invention. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] At present, the heat exchange efficiency monitoring of heat exchangers usually relies on sensors installed inside the heat exchangers to collect data inside the heat exchangers, and analyze the data to determine whether the heat exchange efficiency of the heat exchangers is abnormal. However, due to the influence of the surrounding environment, such as temperature and wind speed, the data generated by the radiator will be disturbed, causing the final monitoring results to be biased and increasing the probability of misjudgment. Therefore, a heat exchange performance monitoring method for heat exchangers is proposed to reduce the deviation value of the monitoring results and reduce the probability of misjudgment. Please refer to Figure 1 , the method is as follows:

[0054] Step 1. Collect the external ambient temperature data and wind speed data of the heat exchanger, obtain the fluid temperature at the inlet of the heat exchanger heat exchange pipe, the fluid temperature at the outlet of the heat exchanger heat exchange pipe, the fluid pressure at the inlet of the heat exchange pipe and the fluid pressure at the outlet of the heat exchange pipe. To facilitate subsequent calculations, add characters to the collected data, where: the external ambient temperature data is represented as Ww, the wind speed data is represented as Wf, the fluid temperature at the inlet of the heat exchange pipe is represented as Jw, the fluid temperature at the outlet of the heat exchanger heat exchange pipe is represented as Cw, the fluid pressure at the inlet of the heat exchange pipe is represented as Jy, and the fluid pressure at the outlet of the heat exchange pipe is represented as Cy.

[0055] Step 2: Calculate the inlet and outlet fluid temperature difference according to the fluid temperature at the inlet of the heat exchanger heat exchange pipe and the fluid temperature at the outlet of the heat exchange pipe, and calculate the mass flow rate according to the inlet fluid pressure of the heat exchange pipe, the outlet fluid pressure of the heat exchange pipe, the density of the known fluid and the cross-sectional area of ​​the heat exchange pipe; wherein:

[0056] The calculation expression of the inlet and outlet fluid temperature difference is as follows:

[0057] ΔWC=Cw-Jw

[0058] In the formula, ΔWC represents the temperature difference between the inlet and outlet fluids;

[0059] The mass flow calculation expression is as follows:

[0060]

[0061] In the formula, lx represents the flow coefficient, (Cy-Jy) represents the difference between the fluid pressure at the outlet of the heat exchange pipe and the fluid pressure at the inlet of the heat exchange pipe, md represents the density of the known fluid, Jm represents the cross-sectional area of ​​the heat exchange pipe, and L represents the mass flow rate.

[0062] Step 3: Calculate the heat transferred by the heat exchanger based on the inlet and outlet fluid temperature difference and mass flow rate. The calculation expression is as follows:

[0063] CR=L*br*ΔWC

[0064] In the formula, CR represents the heat transferred by the heat exchanger, and br represents the specific heat capacity per unit mass of fluid under constant pressure. This value is a known value, and the result of the calculation can be understood as the heat transfer calculated by the data collected by the internal sensor of the heat exchanger at this time.

[0065] Step 4: Calculate the environmental influence coefficient on heat transfer based on the external ambient temperature data and wind speed data; the calculation expression is as follows:

[0066]

[0067] In the formula, Cw-Ww represents the temperature difference between the fluid temperature at the outlet of the heat exchanger heat exchange pipe and the external ambient temperature data. Represents the power exponent, hyx represents the coefficient of influence of environment on heat transfer, and the effect of calculating the coefficient of influence of environment on heat transfer is the influence factor of the current environment on the heat exchanger.

[0068] Step 5: Calculate the fluid flow rate based on the cross-sectional area of ​​the heat exchange pipe, the mass flow rate and the known density of the fluid, and calculate the heat transfer coefficient of the heat exchanger based on the fluid flow rate, where:

[0069] The calculation expression of fluid flow rate is as follows:

[0070]

[0071] In the formula, md*Jm represents the mass of fluid carried by each unit size of the cross-sectional area Jm per unit time. The mass flow rate is expressed as ls, which is the mass of fluid carried per unit size of cross-sectional area Jm per unit time.

[0072] The heat transfer coefficient calculation expression of the heat exchanger is as follows:

[0073]

[0074] In the formula, cd represents the length of the heat exchanger heat exchange pipe, μ represents the dynamic viscosity of the fluid, and hr represents the heat transfer coefficient of the heat exchanger. The length cd of the heat exchanger heat exchange pipe is determined by the heat exchangers of different specifications, and the dynamic viscosity μ of the fluid is determined by the type of fluid. Both are known values.

[0075] Step 6: Calculate the heat transfer coefficient of the heat exchanger under the current environment based on the heat transfer coefficient and the heat transfer influence coefficient of the heat exchanger, and calculate the heat transfer amount of the heat exchanger based on the heat transfer coefficient; wherein:

[0076] The calculation expression of heat transfer coefficient under the previous environment is as follows:

[0077]

[0078] In the formula, represents the heat transfer resistance inside the heat exchanger, represents the heat transfer resistance outside the heat exchanger, It represents the sum of the heat transfer resistance inside the heat exchanger and the heat transfer resistance outside the heat exchanger, that is, the total thermal resistance. It represents the amount of heat passing through the cross-sectional area Jm per unit time, and crx represents the heat transfer coefficient under the current environment;

[0079] The heat transfer calculation expression of the heat exchanger is as follows:

[0080] Rl=crx*jm*ΔWC

[0081] In the formula, crx*jm*ΔWC is the heat transfer capacity of the heat exchanger under the current ambient temperature and wind speed, that is, the heat transfer amount of the heat exchanger, and the heat transfer amount of the heat exchanger is expressed as Rl.

[0082] Step 7. After the heat transfer of the heat exchanger is calculated, the heat transfer efficiency is calculated by combining it with the designed heat transfer of the heat exchanger. The heat transfer efficiency is used to determine whether the heat transfer performance is abnormal. If an abnormality occurs, an early warning is issued. The heat transfer efficiency calculation expression is as follows:

[0083]

[0084] In the formula, ll represents the design heat transfer capacity of the heat exchanger. It represents the ratio of the heat transfer amount of the heat exchanger to the designed heat transfer amount of the heat exchanger, that is, the heat transfer efficiency, and rxl represents the heat transfer efficiency.

[0085] When the heat transfer efficiency rxl is less than 20% or greater than 100%, it indicates that the current heat transfer efficiency is abnormal.

[0086] By collecting the external ambient temperature data and wind speed data of the heat exchanger, and calculating the environmental influence coefficient on heat exchange based on these data, at the same time, collecting the fluid temperature at the inlet of the heat exchange pipe of the heat exchanger, the fluid temperature at the outlet of the heat exchange pipe of the heat exchanger, the fluid pressure at the inlet of the heat exchange pipe and the fluid pressure at the outlet of the heat exchange pipe, and calculating the heat transfer coefficient of the heat exchanger based on these data, the heat transfer coefficient of the heat exchanger and the environmental influence coefficient on heat transfer are combined to calculate the heat transfer coefficient under the current environment, and the heat transfer amount of the current heat exchanger is calculated based on the coefficient, and the heat transfer efficiency is calculated based on the current heat transfer amount of the heat exchanger and the design heat amount of the heat exchanger. Whether the heat exchanger is abnormal is judged based on the heat transfer efficiency. Therefore, whether the heat exchange efficiency of the heat exchanger is abnormal can be judged based on the environmental factors in which the heat exchanger is located, thereby improving the accuracy of the results and reducing the chance of misjudgment.

[0087] The above method also relies on the implementation of a heat exchanger heat exchange performance monitoring system, which includes a heat exchanger internal data acquisition unit, a heat exchanger external data acquisition unit, a data processing unit and an early warning unit;

[0088] The internal data acquisition unit of the heat exchanger is used to obtain the fluid temperature at the inlet of the heat exchange pipe of the heat exchanger, the fluid temperature at the outlet of the heat exchange pipe of the heat exchanger, the fluid pressure at the inlet of the heat exchange pipe and the fluid pressure at the outlet of the heat exchange pipe;

[0089] The heat exchanger external data acquisition unit is used to collect the external ambient temperature data and wind speed data of the heat exchanger;

[0090] The heat exchanger internal data acquisition unit and the heat exchanger external data acquisition unit send the collected data to the data processing unit;

[0091] The data processing unit is used to process the collected data to obtain the heat transfer efficiency, and judge whether the heat transfer performance of the heat exchanger is abnormal according to the calculated heat transfer efficiency. When the heat transfer efficiency is abnormal, it is judged that the heat transfer performance of the heat exchanger is abnormal, and an abnormal signal is generated and sent to the early warning unit;

[0092] After receiving the abnormal signal, the early warning unit will issue an alarm.

[0093] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for monitoring heat exchange performance of a heat exchanger, characterized in that: The following steps are involved: S1. Collecting the external ambient temperature data and wind speed data of the heat exchanger, obtaining the fluid temperature at the inlet of the heat exchange pipe of the heat exchanger, the fluid temperature at the outlet of the heat exchange pipe of the heat exchanger, the fluid pressure at the inlet of the heat exchange pipe, and the fluid pressure at the outlet of the heat exchange pipe; S2. Calculate the inlet and outlet fluid temperature difference according to the fluid temperature at the inlet of the heat exchange pipe of the heat exchanger and the fluid temperature at the outlet of the heat exchange pipe of the heat exchanger, and calculate the mass flow rate according to the inlet fluid pressure of the heat exchange pipe, the outlet fluid pressure of the heat exchange pipe, the density of the known fluid and the cross-sectional area of ​​the heat exchange pipe; S3, calculating the heat transferred by the heat exchanger according to the temperature difference and mass flow rate of the inlet and outlet fluids; S4. Calculate the influence coefficient of the environment on heat transfer according to the external environment temperature data and wind speed data; S5. Calculate the fluid flow rate according to the cross-sectional area of ​​the heat exchange pipe, the mass flow rate and the density of the known fluid, and calculate the heat transfer coefficient of the heat exchanger according to the fluid flow rate; S6. Calculating the heat transfer coefficient of the heat exchanger under the current environment according to the heat transfer coefficient and the heat transfer influence coefficient of the heat exchanger, and calculating the heat transfer amount of the heat exchanger according to the heat transfer coefficient; S7. After the heat transfer of the heat exchanger is calculated, the heat transfer efficiency is calculated by combining it with the designed heat transfer of the heat exchanger, and whether the heat transfer performance is abnormal is determined based on the heat transfer efficiency. When an abnormality occurs, an early warning prompt is issued.

2. A method for monitoring heat exchange performance of a heat exchanger according to claim 1, characterized in that: The external environment temperature data is represented as Ww, the wind speed data is represented as Wf, the fluid temperature at the inlet of the heat exchange pipe is represented as Jw, the fluid temperature at the outlet of the heat exchanger heat exchange pipe is represented as Cw, the fluid pressure at the inlet of the heat exchange pipe is represented as Jy, and the fluid pressure at the outlet of the heat exchange pipe is represented as Cy.

3. The method for monitoring heat exchange performance of a heat exchanger according to claim 1, characterized in that: The calculation expression of the inlet and outlet fluid temperature difference is as follows: ΔWC=Cw-Jw In the formula, ΔWC represents the temperature difference between the inlet and outlet fluids; The mass flow calculation expression is as follows: In the formula, lx represents the flow coefficient, (Cy-Jy) represents the difference between the fluid pressure at the outlet of the heat exchange pipe and the fluid pressure at the inlet of the heat exchange pipe, md represents the density of the known fluid, Jm represents the cross-sectional area of ​​the heat exchange pipe, and L represents the mass flow rate.

4. A method for monitoring heat exchange performance of a heat exchanger according to claim 3, characterized in that: The heat transfer calculation expression of the heat exchanger is as follows: CR=L*br*ΔWC In the formula, CR represents the heat transferred by the heat exchanger, and br represents the specific heat capacity per unit mass of fluid at constant pressure, which is a known value.

5. A heat exchange performance monitoring system and method for a heat exchanger according to claim 4, characterized in that: The calculation expression of the environment's influence on heat transfer coefficient is as follows: In the formula, Cw-Ww represents the temperature difference between the fluid temperature at the outlet of the heat exchanger heat exchange pipe and the external ambient temperature data. represents the power exponent, and hyx represents the coefficient of influence of environment on heat transfer.

6. A heat exchange performance monitoring system and method for a heat exchanger according to claim 5, characterized in that: The fluid flow rate calculation expression is as follows: In the formula, md*Jm represents the mass of fluid carried by each unit size of the cross-sectional area Jm per unit time. The mass flow rate is expressed as the mass of fluid carried per unit size of the cross-sectional area Jm per unit time, and the fluid flow rate is expressed as ls.

7. A system and method for monitoring heat exchange performance of a heat exchanger according to claim 6, characterized in that: The heat exchange coefficient calculation expression of the heat exchanger is as follows: In the formula, cd represents the length of the heat exchanger heat exchange pipe, μ represents the dynamic viscosity of the fluid, and hr represents the heat transfer coefficient of the heat exchanger. The length cd of the heat exchanger heat exchange pipe is determined by the heat exchangers of different specifications, and the dynamic viscosity μ of the fluid is determined by the type of fluid. Both are known values.

8. A system and method for monitoring heat exchange performance of a heat exchanger according to claim 7, characterized in that: The heat transfer coefficient calculation expression under the current environment is as follows: In the formula, represents the heat transfer resistance inside the heat exchanger, represents the heat transfer resistance outside the heat exchanger, It represents the sum of the heat transfer resistance inside the heat exchanger and the heat transfer resistance outside the heat exchanger, that is, the total thermal resistance. It represents the amount of heat passing through the cross-sectional area Jm per unit time, and crx represents the heat transfer coefficient under the current environment; The heat transfer calculation expression of the heat exchanger is as follows: Rl=crx*jm*ΔWC In the formula, crx*jm*ΔWC is the heat transfer capacity of the heat exchanger under the current ambient temperature and wind speed, that is, the heat transfer amount of the heat exchanger, and the heat transfer amount of the heat exchanger is expressed as Rl.

9. A system and method for monitoring heat exchange performance of a heat exchanger according to claim 9, characterized in that: The heat transfer efficiency calculation expression is as follows: In the formula, ll represents the design heat transfer capacity of the heat exchanger. It represents the ratio of the heat transfer amount of the heat exchanger to the designed heat transfer amount of the heat exchanger, that is, the heat transfer efficiency, and rxl represents the heat transfer efficiency.

10. A heat exchange performance monitoring system for a heat exchanger, characterized in that: It includes a heat exchanger internal data acquisition unit, a heat exchanger external data acquisition unit, a data processing unit and an early warning unit; The internal data acquisition unit of the heat exchanger is used to obtain the fluid temperature at the inlet of the heat exchange pipe of the heat exchanger, the fluid temperature at the outlet of the heat exchange pipe of the heat exchanger, the fluid pressure at the inlet of the heat exchange pipe and the fluid pressure at the outlet of the heat exchange pipe; The heat exchanger external data acquisition unit is used to collect the external environment temperature data and wind speed data of the heat exchanger; The heat exchanger internal data acquisition unit and the heat exchanger external data acquisition unit send the collected data to the data processing unit; The data processing unit is used to process the collected data to obtain the heat transfer efficiency, and judge whether the heat exchange performance of the heat exchanger is abnormal according to the calculated heat transfer efficiency. When the heat transfer efficiency is abnormal, it is judged that the heat exchange performance of the heat exchanger is abnormal, and an abnormal signal is generated and sent to the early warning unit; After receiving the abnormal signal, the early warning unit issues an alarm.

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