Parallel host traffic distribution without sensing calculation method

Abstract

The application discloses a parallel host flow distribution sensorless measurement method, which comprises the following steps: step one, installing a flowmeter on a main pipeline to obtain the real-time flow of the main pipeline through the flowmeter; step two, calculating the flow proportion of each parallel refrigerating unit, and obtaining the accurate flow of each refrigerating unit according to the flow proportion of each parallel refrigerating unit; step three, calculating the corresponding refrigerating capacity of each refrigerating unit through the accurate flow of each refrigerating unit; step four, performing refrigerating efficiency analysis and processing on each refrigerating unit; and step five, performing energy comparison analysis according to the refrigerating efficiency result. The application has the beneficial effects that the flow proportion of each parallel refrigerating unit is calculated, the accurate flow of each refrigerating unit is obtained according to the flow proportion of each parallel refrigerating unit, the problem of poor flow detection accuracy of each refrigerating unit can be effectively solved, and the refrigerating efficiency of the current refrigerating unit can be quality evaluated according to the refrigerating efficiency.

Description

Technical Field

[0001] This invention relates to the field of parallel host traffic measurement, specifically a sensorless method for parallel host traffic distribution. Background Technology

[0002] Cooling water in a refrigeration unit refers to the water used to reduce the heat generated during the unit's operation. During operation, the compressor produces a significant amount of heat, which needs to be dissipated through cooling water to ensure normal operation. The cooling water system typically consists of a cooling tower, water pump, water pipes, and radiators. The cooling water circulates through the pump, transferring heat to the air or water via the radiators, and then returns to the refrigeration unit for further circulation. The quality and flow rate of the cooling water significantly impact the unit's operating efficiency and lifespan. Poor water quality can clog radiators, affecting heat dissipation; insufficient flow can lead to overheating or even damage. Therefore, the cooling water system of a refrigeration unit requires regular cleaning and maintenance to ensure the water quality and flow rate meet requirements. Simultaneously, attention must be paid to parameters such as cooling water temperature and pressure to guarantee the unit's normal operation and stability. In refrigeration systems, due to the limitations of the installation conditions of the chilled water branch pipes of the refrigeration unit, it is difficult to guarantee the installation conditions of the straight pipe sections before and after the flow meter. Therefore, the actual flow measurement results of the flow meter often have large deviations and poor accuracy. In particular, when multiple refrigeration units are connected in parallel, it is impossible to accurately know the flow distribution of each refrigeration unit, and therefore it is impossible to accurately know the actual flow value of each refrigeration unit. Summary of the Invention

[0003] The purpose of this invention is to address the problem mentioned in the background that, due to the limitations of the installation conditions of the chilled water branch pipes of the chiller unit, it is difficult to guarantee the installation conditions of the straight pipe sections before and after the flow meter, resulting in large deviations and poor accuracy of the actual flow measurement results. Therefore, this invention proposes a sensorless calculation method for flow distribution of parallel main units.

[0004] The objective of this invention can be achieved through the following technical solution: a sensorless calculation method for parallel host traffic distribution, comprising the following steps: Step 1: Install a flow meter on the main pipeline to obtain the real-time flow rate of the main pipeline; The real-time flow rate of the main pipeline is obtained by a flow meter. The long straight pipe section on the main pipeline can ensure the installation conditions before and after the flow meter, thereby ensuring the accuracy of the flow meter measurement data. Step 2: Calculate the flow rate ratio of each parallel chiller unit, and based on the flow rate ratio of each parallel chiller unit, obtain the accurate flow rate of each chiller unit; Step 3: Calculate the cooling capacity of each refrigeration unit based on its accurate flow rate; Step 4: Perform refrigeration efficiency analysis on each refrigeration unit; Step 5: Conduct an energy comparison analysis based on the cooling efficiency results; Step Six: Perform fault diagnosis based on the accurate flow rate of each refrigeration unit.

[0005] Furthermore, in step two, the accurate flow rate of each refrigeration unit is calculated as follows: The rated flow rate of the main pipeline is Q (Q=Q1+Q2), the pipe diameter is D, and the flow velocity at the rated flow rate is V, where Q1 is the rated flow rate of chiller unit one, Q1=3.14*D1. 2 *V1 / 4=0.785*D1 2 *V1, the pressure drop of the unit at rated flow is H1, the pipe diameter is D1, the flow velocity at rated flow is V1, Q2 is the rated flow of chiller unit two, Q2=3.14*D2 2 *V² / 4 = 0.785 * D² 2 *V2, the unit pressure drop at rated flow is H2, the pipe diameter is D2, and the flow velocity at rated flow is V2; The water pressure drop of the unit is expressed as H=SV 2 Where H is the pressure drop of the unit, S is the overall resistance coefficient (a fixed value), and V is the flow velocity at the unit, the resistance coefficient of refrigeration unit one can be obtained as S1 = H1 / V1. 2 The resistance coefficient of refrigeration unit two is S2=H2 / V2 2 ; When the actual total flow rate of the system is Q0, the actual flow rate of chiller unit one is Q. 01 The flow velocity is V 01 The actual flow rate of the second refrigeration unit is Q. 02 The flow velocity is V 02 ; We get Q0=Q 01 +Q 02 =0.785*D1 2 *V 01 +0.785*D2 2 *V 02 According to the fluid hydraulic balance relationship, since refrigeration unit one and refrigeration unit two are connected in parallel, their actual pressure drops are the same during actual operation. Therefore, S1*V 01 2 =S2*V 02 2 That is, H1*V 01 2 / V1 2 =H2*V 022 / V2 2 ; According to formula (1), Q0 = 0.785 * D1 2 *V 01 +0.785*D2 2 *V 02 V can be obtained 02 =(1.274*Q0-D1 2 *V 01 ) / D2 2 Substitute into formula (2) H1*V 01 2 / V1 2 =H2*V 02 2 / V2 2 V can be obtained in the end. 02 The specific value, then V 02 Substituting the specific value into the above formula, we can obtain V. 01 The specific value is then determined according to formula (3) Q. 01 =0.785*D1 2 *V 01 Q can be obtained 01 The specific value is determined by Q0=Q 01 +Q 02 Q can be obtained 02 The specific value.

[0006] Based on the above information, the specific flow rate values ​​of each host in parallel can be directly calculated using formulas (1), (2), and (3).

[0007] The above solution involves installing flow meters on the main pipeline to ensure the accuracy of the flow meter measurement data. The flow meters acquire the real-time flow of the main pipeline, and the flow ratio of each parallel chiller unit is calculated. Based on the flow ratio of each parallel chiller unit, the accurate flow of each chiller unit is obtained, which can effectively solve the problem of poor flow detection accuracy of each chiller unit.

[0008] Furthermore, in step three, the calculation steps for the cooling capacity of each refrigeration unit are: cooling capacity = chilled water flow rate * heat carried away by each cubic meter of chilled water.

[0009] Furthermore, the cooling efficiency analysis in step four involves using the formula COP = Q_c / P, where COP is the cooling efficiency, Q_c is the cooling capacity, and P is the power consumed. The real-time COP value is compared with a pre-set COP standard range. If the real-time COP value is within the pre-set COP standard range, the cooling efficiency of the current refrigeration unit is deemed acceptable. If the real-time COP value is not within the pre-set COP standard range, the cooling efficiency of the current refrigeration unit is deemed unacceptable.

[0010] The above scheme allows for the calculation of the cooling capacity of each refrigeration unit based on its accurate flow rate. The refrigeration efficiency is then determined based on the cooling capacity and the power consumed, and the refrigeration efficiency is assessed to evaluate the quality of the current refrigeration unit.

[0011] Furthermore, the energy comparison analysis process in step five is as follows: The COP of different refrigeration units at different time periods is obtained. The COP of different refrigeration units at different time periods is arranged from largest to smallest. The highest COP value of each refrigeration unit is obtained. Taking a certain refrigeration unit as a sample unit, after arranging the COP values ​​of the refrigeration unit, the highest COP value of the sample unit in a certain time period is obtained. The time period in which the highest COP value of the refrigeration unit is located is taken as the sample time. The COP sample values ​​of other refrigeration units in the same time period are obtained. Compare the COP sample values ​​of other refrigeration units during the same period with their respective highest COP values. Retain refrigeration units whose COP sample values ​​and highest COP values ​​are the same within the same time period. The retained refrigeration units are those with the highest COP values ​​in the same time period. Obtain the condition parameters of the unit, including ambient temperature, ambient humidity, refrigerant type, unit load, and refrigeration flow rate.

[0012] In application, the system can acquire the COP values ​​of multiple different refrigeration units at various time periods. It can also acquire the corresponding time periods within different seasons to determine the optimal COP value (maximum COP) for a particular refrigeration unit under different seasonal conditions. Determining the time within a given season ensures that the temperature and humidity conditions of all participating units are the same, thus guaranteeing the stability of the data selection. Furthermore, it can filter for the highest COP value across multiple time periods in different seasons, identifying the refrigeration unit with the highest COP value across multiple time periods. The system saves and records relevant data for each refrigeration unit, including ambient temperature, ambient humidity, refrigerant type, unit load, refrigeration flow rate, and associated time information. When the user inputs time information, the system can retrieve the corresponding refrigeration unit data, allowing users to query the ambient temperature, ambient humidity, refrigerant type, unit load, and refrigeration flow rate of the refrigeration unit with the highest COP value simply by time.

[0013] Furthermore, the fault diagnosis step in step six is ​​as follows: S01: Record the calculation results of the cooling flow rate of each unit for each time; S02: Sum the results of each calculation and divide by the cumulative number of sums to obtain the average value R of the cooling flow rate; S03: Arrange the calculation results of cooling flow rate in historical data according to the numerical value, and use the minimum cooling flow rate as the reference point; S04: Obtain the most recent cooling flow rate value M, and compare it with the average cooling flow rate. If the value is not lower than the average, no action is taken. If the value is lower than the average, the percentage decrease in flow rate is calculated. The calculation process is (RM)R=B, with a preset percentage warning value G. If B<G, no action is taken. If B≥G, the value M is compared with the minimum cooling flow rate. If the minimum cooling flow rate is less than the value M, the value M is marked as abnormal. The value M marked as abnormal is not used as the update data for the minimum cooling flow rate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: By installing flow meters on the main pipeline to ensure the accuracy of the flow meter measurement data, the flow meters obtain the real-time flow of the main pipeline, calculate the flow ratio of each parallel chiller unit, and obtain the accurate flow of each chiller unit based on the flow ratio of each parallel chiller unit. This can effectively solve the problem of poor flow detection accuracy of each chiller unit. It can calculate the cooling capacity of each refrigeration unit based on the accurate flow rate of each refrigeration unit, calculate the cooling efficiency based on the cooling capacity and the power consumed, and make a judgment based on the cooling efficiency, thereby conducting a quality assessment of the cooling efficiency of the current refrigeration unit. The system can screen out the refrigeration units with the highest COP value within the same time period. Since the selected refrigeration units are in the same time period, their ambient temperature and humidity conditions are the same, making the selected samples more stable and reliable. The refrigerant type, unit load, and refrigeration flow rate of the qualified refrigeration units can be obtained as reference data for the refrigeration units when they are operating at the highest COP value. It has a fault diagnosis function for abnormal flow of refrigeration units. It can record the calculation results of the refrigeration flow of each unit in history, calculate the average value and minimum flow based on historical data, compare the most recent refrigeration flow with the average value and minimum flow, and mark the abnormality in time when the value is abnormal, so as to facilitate subsequent flow alarm operation. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a flowchart of the sensorless calculation method for parallel host traffic allocation according to the present invention. Detailed Implementation

[0017] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 As shown, the sensorless calculation method for parallel host traffic distribution includes the following steps: Step 1: Install a flow meter on the main pipeline to obtain the real-time flow of the main pipeline. The long straight pipe section on the main pipeline can ensure the installation conditions before and after the flow meter, thereby ensuring the accuracy of the flow meter measurement data. Step Two: Calculate the flow rate ratio of each parallel chiller unit. Based on this ratio, determine the accurate flow rate of each chiller unit. A parallel chiller unit is a type of refrigeration equipment composed of multiple chiller units connected in parallel. They can operate simultaneously to provide greater cooling capacity. These units are typically used in large commercial or industrial applications. The working principle of a parallel chiller unit is to connect multiple chiller units in parallel and synchronize their operation through a control system, thereby achieving greater cooling capacity. This design improves system reliability and stability; even if one unit fails, the others can continue to operate without affecting the overall system operation. Parallel chiller units offer advantages such as high efficiency, stability, reliability, and energy saving. The workload of a parallel chiller unit can be adjusted according to actual needs to avoid energy waste. Furthermore, parallel chiller units can provide better temperature and humidity control to meet the needs of different locations. In step two, the accurate flow rate of each refrigeration unit is calculated as follows: The rated flow rate of the main pipeline is Q (Q=Q1+Q2), the pipe diameter is D, and the flow velocity at the rated flow rate is V, where Q1 is the rated flow rate of chiller unit one, Q1=3.14*D1. 2 *V1 / 4=0.785*D1 2 *V1, the pressure drop of the unit at rated flow is H1, the pipe diameter is D1, the flow velocity at rated flow is V1, Q2 is the rated flow of chiller unit two, Q2=3.14*D2 2 *V² / 4 = 0.785 * D² 2 *V2, the unit pressure drop at rated flow is H2, the pipe diameter is D2, and the flow velocity at rated flow is V2; The water pressure drop of the unit is expressed as H=SV 2 Where H is the pressure drop of the unit, S is the overall resistance coefficient (a fixed value), and V is the flow velocity at the unit, the resistance coefficient of refrigeration unit one can be obtained as S1 = H1 / V1. 2 The resistance coefficient of refrigeration unit two is S2=H2 / V2 2 ; When the actual total flow rate of the system is Q0, the actual flow rate of chiller unit one is Q. 01 The flow velocity is V 01 The actual flow rate of the second refrigeration unit is Q. 02 The flow velocity is V 02 ; We get Q0=Q 01 +Q 02 =0.785*D1 2 *V 01 +0.785*D2 2 *V 02According to the fluid hydraulic balance relationship, since refrigeration unit one and refrigeration unit two are connected in parallel, their actual pressure drops are the same during actual operation. Therefore, S1*V 01 2 =S2*V 02 2 That is, H1*V 01 2 / V1 2 =H2*V 02 2 / V2 2 ; According to formula (1), Q0 = 0.785 * D1 2 *V 01 +0.785*D2 2 *V 02 V can be obtained 02 =(1.274*Q0-D1 2 *V 01 ) / D2 2 Substitute into formula (2) H1*V 01 2 / V1 2 =H2*V 02 2 / V2 2 V can be obtained in the end. 02 The specific value, then V 02 Substituting the specific value into the above formula, we can obtain V. 01 The specific value is then determined according to formula (3) Q. 01 =0.785*D1 2 *V 01 Q can be obtained 01 The specific value is determined by Q0=Q 01 +Q 02 Q can be obtained 02 The specific value.

[0019] Based on the above, the specific flow values ​​of each host in parallel can be directly calculated using formulas (1), (2), and (3). The above solution involves installing a flow meter on the main pipeline to ensure the accuracy of the flow meter measurement data. The flow meter obtains the real-time flow of the main pipeline and calculates the flow ratio of each parallel chiller unit. Based on the flow ratio of each parallel chiller unit, the accurate flow of each chiller unit is obtained, which can effectively solve the problem of poor flow detection accuracy of each chiller unit. Step 3: Calculate the cooling capacity of each chiller unit based on the accurate flow rate of each chiller unit. In Step 3, the calculation steps for the cooling capacity of each chiller unit are: Cooling capacity = chilled water flow rate * heat carried away by each cubic meter of chilled water. Step 4: Perform cooling efficiency analysis on each refrigeration unit. The cooling efficiency analysis in Step 4 is performed using the formula COP = Q_c / P, where COP is the cooling efficiency, Q_c is the cooling capacity, and P is the power consumed. The real-time COP value is compared with a pre-set COP standard range. If the real-time COP value is within the pre-set COP standard range, the cooling efficiency of the current refrigeration unit is deemed acceptable. If the real-time COP value is not within the pre-set COP standard range, the cooling efficiency of the current refrigeration unit is deemed unacceptable. The above scheme allows for the calculation of the cooling capacity of each refrigeration unit based on its accurate flow rate. The refrigeration efficiency is then determined based on the cooling capacity and the power consumed, and the refrigeration efficiency is assessed to evaluate the quality of the current refrigeration unit.

[0020] Step 5: Conduct an energy comparison analysis based on the cooling efficiency results. Cooling efficiency is one of the important indicators for measuring the performance of a refrigeration unit, and it is also a key factor in assessing the energy consumption and environmental impact of a refrigeration system. In order to better evaluate the cooling efficiency, it is necessary to analyze and integrate the operating data of the refrigeration unit in order to obtain accurate energy comparison analysis results. The energy comparison analysis process in step five is as follows: The COP of different refrigeration units at different time periods is obtained. The COP of different refrigeration units at different time periods is arranged from largest to smallest. The highest COP value of each refrigeration unit is obtained. Taking a certain refrigeration unit as a sample unit, after arranging the COP values ​​of the refrigeration unit, the highest COP value of the sample unit in a certain time period is obtained. The time period in which the highest COP value of the refrigeration unit is located is taken as the sample time. The COP sample values ​​of other refrigeration units in the same time period are obtained. Compare the COP sample values ​​of other refrigeration units during the same period with their respective highest COP values. Retain refrigeration units whose COP sample values ​​and highest COP values ​​are the same within the same time period. The retained refrigeration units are those with the highest COP values ​​in the same time period. Obtain the condition parameters of the unit, including ambient temperature, ambient humidity, refrigerant type, unit load, and refrigeration flow rate. In practical applications, it can acquire the COP values ​​of multiple different refrigeration units at various time periods. For different seasons, it can acquire the corresponding time periods within each season to determine the optimal COP value (maximum COP) for a particular refrigeration unit under different seasonal conditions. Determining the time within a given season ensures that the temperature and humidity conditions of all participating units are the same, thus guaranteeing the stability of the data selection. It can also filter for the highest COP value across multiple time periods in different seasons, identifying the refrigeration unit with the highest COP value across multiple time periods. The system saves and records relevant data for each refrigeration unit, including ambient temperature, ambient humidity, refrigerant type, unit load, refrigeration flow rate, and associated time information. When the user inputs time information, the system can retrieve the corresponding refrigeration unit data, allowing users to query the ambient temperature, ambient humidity, refrigerant type, unit load, and refrigeration flow rate of the refrigeration unit with the highest COP value simply by time.

[0021] The above method can screen out the refrigeration units with the highest COP value within the same time period. Since the selected refrigeration units are in the same time period, their ambient temperature and humidity conditions are the same, making the selected samples more stable and reliable. The refrigerant type, unit load, and refrigeration flow rate of the qualified refrigeration units can be obtained as reference data for the refrigeration units when they are operating at the highest COP value.

[0022] Step Six: Perform fault diagnosis based on the accurate flow rate of each refrigeration unit. The fault diagnosis steps in Step Six are as follows: S01: Record the calculation results of the cooling flow rate of each unit for each time; S02: Sum the results of each calculation and divide by the cumulative number of sums to obtain the average value R of the cooling flow rate; S03: Arrange the calculation results of cooling flow rate in historical data according to the numerical value, and use the minimum cooling flow rate as the reference point; S04: Obtain the most recent cooling flow rate value M, compare this value with the average cooling flow rate, and if the value is not lower than the average, no action is taken. If the value is lower than the average, the percentage decrease in flow rate is calculated using the formula (RM)R=B. A preset percentage warning value G is provided. If B<G, no action is taken. If B≥G, the value M is compared with the minimum cooling flow rate. If the minimum cooling flow rate is less than the value M, the value M is marked as abnormal. The abnormal value M is not used as the updated data for the minimum cooling flow rate. In other words, the abnormally marked cooling flow rate value is not used as a reference point. This function has a fault diagnosis function for abnormal cooling unit flow rates. It can record the calculation results of cooling flow rates for each unit in history, obtain the average and minimum flow rates based on historical data, and compare the most recent cooling flow rate with the average and minimum flow rates. When the value is abnormal, it can mark the abnormality in a timely manner, thus facilitating subsequent flow alarm operations.

[0023] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sensorless calculation method for parallel host traffic distribution, characterized in that, Includes the following steps: Step 1: Install a flow meter on the main pipeline to obtain the real-time flow rate of the main pipeline; Step 2: Calculate the flow rate ratio of each parallel chiller unit, and based on the flow rate ratio of each parallel chiller unit, obtain the accurate flow rate of each chiller unit; Step 3: Calculate the cooling capacity of each refrigeration unit based on its accurate flow rate; Step 4: Perform refrigeration efficiency analysis on each refrigeration unit; Step 5: Conduct an energy comparison analysis based on the cooling efficiency results; Step Six: Perform fault diagnosis based on the accurate flow rate of each refrigeration unit; The energy comparison analysis process in step five is as follows: The cooling efficiency COP of different refrigeration units at different time periods is obtained. The COP of different refrigeration units at different time periods is arranged from largest to smallest. The highest COP value of each refrigeration unit is obtained. Taking a certain refrigeration unit as a sample unit, after arranging the COP values ​​of the refrigeration unit, the highest COP value of the sample unit in a certain time period is obtained. The time period in which the highest COP value of the refrigeration unit occurs is taken as the sample time, and the COP sample values ​​of other refrigeration units in the same time period are obtained. Compare the COP sample values ​​of other refrigeration units during the same period with their respective highest COP values. Retain the refrigeration units whose COP sample values ​​within the same time period are the same as their respective highest COP values. The retained refrigeration units are the refrigeration units with the highest COP values ​​in the same time period. Obtain the condition parameters of the unit, including ambient temperature, ambient humidity, refrigerant type, unit load, and refrigeration flow rate. The fault diagnosis steps in step six are as follows: S01: Record the calculation results of the cooling flow rate of each unit for each time; S02: Sum the results of each calculation and divide by the cumulative number of sums to obtain the average value R of the cooling flow rate; S03: Arrange the calculation results of cooling flow rate in historical data according to the numerical value, and use the minimum cooling flow rate as the reference point; S04: Obtain the most recent cooling flow rate value M, and compare it with the average cooling flow rate. If the value is not lower than the average, no action is taken. If the value is lower than the average, the percentage decrease in flow rate is calculated as (RM) / R=B. A percentage warning value G is preset. If B<G, no action is taken. If B≥G, the value M is compared with the minimum cooling flow rate. If the minimum cooling flow rate is less than the value M, the value M is marked as abnormal. The value M marked as abnormal will not be used as the update data for the minimum cooling flow rate.

2. The sensorless calculation method for parallel host traffic distribution according to claim 1, characterized in that, In step two, the accurate flow rate of each refrigeration unit is calculated as follows: The rated flow rate of the main pipeline is Q, where Q = Q1 + Q2, the pipe diameter is D, and the flow velocity at the rated flow rate is V. Where Q1 is the rated flow rate of chiller unit one, Q1 = 3.14 * D1 2 *V1 / 4=0.785*D1 2 *V1, the pressure drop of the unit at rated flow is H1, the pipe diameter is D1, the flow velocity at rated flow is V1, Q2 is the rated flow of chiller unit two, Q2=3.14*D2 2 *V² / 4 = 0.785 * D² 2 *V2, the unit pressure drop at rated flow is H2, the pipe diameter is D2, and the flow velocity at rated flow is V2; The water pressure drop of the unit is expressed as H=SV". 2 Where H is the pressure drop of the unit, S is the overall resistance coefficient (a fixed value), and V" is the flow velocity at the unit, therefore, the resistance coefficient of refrigeration unit one is S1 = H1 / V1. 2 The resistance coefficient of refrigeration unit two is S2=H2 / V2 2 ; When the actual total flow rate of the system is Q0, the actual flow rate of chiller unit one is Q. 01 The actual flow velocity is V 01 The actual flow rate of the second refrigeration unit is Q. 02 The actual flow velocity is V 02 ; We get Q0=Q 01 +Q 02 =0.785*D1 2 *V 01 +0.785*D2 2 *V 02 According to the fluid hydraulic balance relationship, since refrigeration unit one and refrigeration unit two are connected in parallel, their actual pressure drops are the same during actual operation. Therefore, S1*V 01 2 =S2*V 02 2 That is, H1*V 01 2 / V1 2 =H2*V 02 2 / V2 2 ; According to formula (1), Q0 = 0.785 * D1 2 *V 01 +0.785*D2 2 *V 02 V can be obtained 02 =(1.274*Q0-D1 2 *V 01 ) / D2 2 Substitute into formula (2) H1*V 01 2 / V1 2 =H2*V 02 2 / V2 2 V can be obtained in the end. 01 The specific value, then through V 01 The specific value of V is obtained 02 The specific value is then determined according to formula (3) Q. 01 =0.785*D1 2 *V 01 Q can be obtained 01 The specific value is determined by Q0=Q 01 +Q 02 Q can be obtained 02 The specific value; Using the above method, the specific flow rate values ​​of each host in parallel can be directly calculated according to formulas (1), (2), and (3).

3. The sensorless calculation method for parallel host traffic distribution according to claim 1, characterized in that, In step three, the calculation steps for the cooling capacity of each refrigeration unit are as follows: Cooling capacity = chilled water flow rate * heat carried away by each cubic meter of chilled water.

4. The sensorless calculation method for parallel host traffic distribution according to claim 1, characterized in that, The cooling efficiency analysis in step four is performed using the formula COP=Q_c / P, where COP is the cooling efficiency, Q_c is the cooling capacity, and P is the power consumed. The real-time COP value is compared with a pre-set COP standard range. If the real-time COP value is within the pre-set COP standard range, the cooling efficiency of the current refrigeration unit is deemed acceptable. If the real-time COP value is not within the pre-set COP standard range, the cooling efficiency of the current refrigeration unit is deemed unacceptable.

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