CN106440188B - Automatic air conditioner operation capacity adjusting system and method - Google Patents

Abstract

The invention relates to an automatic air conditioner running capacity adjusting system and a method thereof.A load rate analyzing module is established by utilizing information of the temperature, the running current and the like of ice water inlet and outlet water of an air conditioner host, the running capacity of each air conditioner host and the sum of the air conditioner capacity required by heat balance of a building space can be calculated, and a high-efficiency multi-host running regulating method meeting the requirement of the space air conditioner capacity is provided by combining the load rate and a power consumption conversion module. The invention further provides an air conditioner host adjusting method, which can determine the prior operation sequence and the operation number according to the power consumption condition of each air conditioner host after operation, and transfer the operation capacity of the air conditioner with low load rate to other operating air conditioner hosts, so that the air conditioner hosts are maintained at high load rate and meet the total operation capacity requirement of the air conditioner, and the operation efficiency trend is analyzed and the energy-saving benefit after improvement of regulation and control is predicted.

Description

Automatic air conditioning operation capacity adjustment system and method

technical field

The invention relates to an automatic air conditioner operation capacity adjustment system and method, which simultaneously records the air conditioner operation load rate, analyzes the operation efficiency trend of the main air conditioner and predicts the energy saving benefit after adjustment and improvement.

Background technique

With the rising awareness of energy conservation and carbon reduction, reducing energy use is an important issue. General energy management products mostly use ICT technology to complete the collection of electricity consumption data to provide management and control energy equipment or report data, but there is no optimized operation strategy for users with multiple air conditioning units. Therefore, how to make the power consumption intelligent automatic operation control mode method, and design the energy consumption calculation and analysis method of the air conditioner host, help users to maintain the high load rate of each air conditioner host according to the total operating capacity of the on-site air conditioner has become a research topic of various parties. the subject.

SUMMARY OF THE INVENTION

The present invention provides an automatic air conditioning operation capacity adjustment system, comprising: a load rate analysis module, an operation capacity analysis module, a load rate and power consumption conversion module, an operation capacity control module, an energy saving benefit analysis module and a communication and access module, wherein the load The rate analysis module calculates the load rate of each air conditioner based on the ice water inlet temperature, ice water outlet temperature, cooling water inlet temperature, cooling water outlet temperature and operating current of multiple air conditioners;

The operating capacity analysis module calculates the operating capacity of each air conditioner based on the operating state, refrigeration capacity setting and load rate of each air conditioner. The load rate and power consumption conversion module is set according to the operating curve of each air conditioner to convert each air conditioner. The power consumption per refrigeration ton (KW/RT) under the corresponding load rate of the main engine, in which the operation capacity control module adjusts the operation of each air conditioning main engine according to the load rate, operating capacity and power consumption per refrigeration ton of each air conditioning main engine, among which the energy saving benefit analysis The module calculates the power consumption and energy-saving benefits of each air-conditioning host, and the communication and access module provides a load rate analysis module, an operation capacity analysis module, a load rate and power consumption conversion module, an operation capacity control module, and an energy-saving benefit analysis module. Connection of the main unit of the air conditioner.

The operation curve of each air conditioner host is set as a linear function, a multiple function, and a multi-segment linear function.

Among them, the load ratio analysis module can perform abnormal operation analysis, including judging the condition of the full load area of the air conditioner and calculating the average temperature difference between the inlet and outlet of the ice water under the condition of the full load area, and storing and updating the historical data of the average temperature difference of the full load operation. If it is low or the trend of historical data is abnormal (for example, the difference between the two strokes is too large or the change of the slope is too large), it is determined that the main unit of the air conditioner is abnormal.

Among them, the operation capacity control module analyzes the power consumption of each air conditioner based on the collected air conditioner load rate, operation capacity, and other operation analysis parameters, so as to perform low load rate shutdown and control the minimum number of air conditioners, so that the air conditioners are maintained at a high load rate. And meet the total operating capacity of the air conditioner.

The present invention provides a method for adjusting the operating capacity of an automatic air conditioner. The steps are as follows:

The load rate analysis module is connected to the access module through communication and collects the ice water inlet temperature, ice water outlet temperature, cooling water inlet temperature, cooling water outlet temperature and operating current of multiple air conditioners, and calculates the load of each air conditioner. Rate;

The operation capacity analysis module is connected with the access module through communication and collects the operation status, refrigeration capacity setting and load rate of each air conditioner host, and calculates the operation capacity of each air conditioner host; and

The operation capacity control module and the energy-saving benefit analysis module calculate the power consumption and energy-saving benefits of each air-conditioning main unit corresponding to multiple operation modes according to the load rate, operating capacity and power consumption adjustment of each air-conditioning main unit, and adjust each air-conditioning main unit. The operation of the main unit of the air conditioner.

Among them, each operation mode is the low load rate shutdown mode, the minimum number of air conditioners mode and the user-defined parameter mode. The energy-saving operation mode adjusts the operation of each air conditioner.

Among them, the low load rate shutdown mode determines the priority of operation according to the load rate of each air conditioner.

Among them, the minimum number of air-conditioning units mode adds up the total operating capacity of each air-conditioning unit, and operates with the minimum number of air-conditioning units under the condition of meeting the total operating capacity.

Among them, the custom parameter mode determines the priority of operation according to the power consumption of each air conditioner.

The system and method for adjusting the operation capacity of the automatic air conditioner of the present invention can help the user to maintain the high load rate of each air conditioner main engine according to the total operation capacity of the on-site air conditioner. The advantages of the present invention compared to the prior art are as follows:

1. The method for adjusting the operating capacity of the automatic air conditioner of the present invention provides three analysis modes, which are the low load rate shutdown mode, the minimum number of air conditioners, and the user-defined parameter mode, which can be determined according to the power consumption of each air conditioner after operation. Prioritize the order of operation and the number of units in operation, and transfer the operating capacity of the air conditioner with a low load rate to other air conditioners in operation, so that the main air conditioners are maintained at a high load rate and meet the total operating capacity of the air conditioner.

2. The calculation and analysis of the energy consumption of the air conditioner of the present invention provides automatic detection and calculation methods such as the load rate of the air conditioner, the operating capacity of the air conditioner, and the power consumption per refrigeration ton (KW/RT) of the air conditioner, which can automatically analyze the operation of the air conditioner The power consumption and air-conditioning operation capacity requirements of the building space can solve the traditional limitation of manual setting and manual measurement.

3. The load rate analysis module of the air conditioner can perform abnormal operation analysis, judge and calculate the average temperature difference between the inlet and outlet of the ice water under the conditions of the full load area of the air conditioner. : The difference between the two strokes is too large or the slope changes too much), that is, it is judged that the main unit of the air conditioner is abnormal.

4. Calculation and analysis of energy-saving benefits, collect the operating capacity of each air-conditioning mainframe before the improvement and the power consumption per refrigeration ton, calculate the power consumption of the air-conditioning before the improvement, and collect intelligent analysis results such as the number of operating units, the operating capacity of each air-conditioning mainframe, and the power consumption per refrigeration ton, etc. Calculate the power consumption of the air conditioner after the improvement. By improving the power consumption of the front air conditioner and improving the power consumption of the rear air conditioner, the energy saving benefits of the optimization of the operating capacity of the air conditioner host are predicted and analyzed.

Description of drawings

FIG. 1 is a schematic structural diagram of an automatic air-conditioning operating capacity adjustment system of the present invention.

FIG. 2 is a flowchart of a method for adjusting the operating capacity of an automatic air conditioner according to the present invention.

Description of reference numerals

1 Load factor analysis module;

2 Operational capacity analysis module;

3 Load rate and power consumption conversion module;

4 Operation capacity control module;

5 Energy saving benefit analysis module;

6 Communication and access module;

7 main air conditioner;

S201-S203 step flow.

Detailed ways

Please refer to FIG. 1 . As shown in the figure, it is a schematic diagram of the structure of the automatic air-conditioning operation capacity adjustment system of the present invention, which includes a load ratio analysis module 1, an operation capacity analysis module 2, a load ratio and power consumption conversion module 3, and an operation capacity control module. Module 4, energy-saving benefit analysis module 5, communication and access module 6 and multiple air-conditioning hosts 7, wherein the load factor analysis module 1 uses the communication and access module 6 to detect ice water inlet temperature (T _wi ) and ice water Signals such as outlet water temperature (T _wo ), cooling water inlet temperature (T _ci ) and cooling water outlet temperature (T _co ), as well as operating current (I), determine the full-load area conditions of the air conditioner host 7 and execute the ice-cooling operation under the full-load area conditions. Average temperature difference between water inlet and outlet. Then collect the real-time temperature difference between the inlet and outlet of the ice water, and calculate the load rate of the air conditioner host 7. The operating capacity analysis module 2 uses the load factor calculated by the load factor analysis module 1, the operating state of the air conditioner 7 collected by the communication and access module 6, and the setting of the refrigeration capacity of the air conditioner 7 to calculate and provide the operating capacity of the air conditioner 7, load The rate and power consumption conversion module 3 uses the operation curve setting of the main air conditioner 7 (for example, conversion formulas such as linear function, multiple function, multi-segment linear function, etc.) Electricity (KW/RT). In addition, the operation capacity control module 4 collects the load rate, operation capacity, and other operation analysis parameters of the air conditioner main unit 7 to perform intelligent automatic operation control of power consumption, and intelligently analyzes the results (for example: operation capacity, number of operating units, main unit load rate) and other improvement parameters) to provide an energy-saving benefit analysis module 5, which predicts and provides energy-saving benefits for optimizing the operating capacity of each air conditioner host 7.

Among them, this system can calculate the energy consumption of the air conditioner host. First, it will judge the full load operation of the air conditioner host. If the air conditioner host is running at full load, it will calculate the average temperature difference of full load operation and update it to the historical data of the average temperature difference of full load operation, and then based on the historical data of the average temperature difference of full load operation. Carry out the calculation of the load rate of the main unit of the air conditioner. If the air conditioner is not running at full load, the load rate of the air conditioner is calculated directly based on the historical data of the average temperature difference in full load operation.

The full-load operation of the air conditioner is judged by using the collected ice water inlet temperature (T _wi ) and the ice water outlet temperature (T _wo ), the cooling water inlet temperature (T _ci ) and the cooling water outlet temperature (T _co ), and the operating current (I ) and other signals to judge whether the air conditioner is running at full load, and the formula for judging the full load operation of the air conditioner is as follows:

F _S =F1(T _wi ,T _wo ,T _ci ,T _co ,I),

Among them, F _S is the full load operation, T _wi is the ice water inlet temperature, T _wo is the ice water outlet temperature, T _ci is the cooling water inlet temperature, T _co is the cooling water outlet temperature, and I is the running current.

The calculation of the average temperature difference in full-load operation is to measure and perform the average calculation of the temperature difference between the inflow and outflow of ice water under the condition of the full-load area of the air conditioner. The calculation formula for the average temperature difference in full-load operation is as follows:

ΔT _ave =F2(T _wi ,T _wo ,n),

ΔT _ave is the average temperature difference in full-load operation, and n is the number of times of ice water temperature measurement.

The formula for calculating the load rate of the air conditioner is as follows:

η=F3(ΔT _ave-N ,T _wi ,T _wo ,N),

η is the load rate of the main air conditioner, ΔT _ave-N is the average temperature difference in historical full-load operation, and N is the number of historical data storage.

The calculation of the power consumption per refrigeration ton of the air conditioner is based on the calculation result of the air conditioner load rate and obtained by converting the load rate and the power consumption per refrigeration ton (KW/RT).

The calculation of the operating capacity of the main air conditioner is based on the calculation result of the load rate of the main air conditioner, the operating state and the refrigeration capacity of the main air conditioner, and the operating capacity of the main air conditioner is calculated and provided.

The formula for calculating the operating capacity of the air conditioner is as follows:

T _RT =F4(S,n,X _RT ),

T _RT is the operating capacity of the air conditioner, S is the operation state of the air conditioner, η is the load rate of the air conditioner, and X _RT is the refrigeration capacity setting of the air conditioner.

Please refer to FIG. 2 , which is a flowchart of the method for adjusting the operating capacity of an automatic air conditioner of the present invention. The steps are as follows:

S201: The load rate analysis module is connected to the access module through communication and collects the ice water inlet temperature, ice water outlet temperature, cooling water inlet temperature, cooling water outlet temperature and operating current of multiple air conditioner hosts, and calculates each air conditioner host load rate;

S202: The operation capacity analysis module is connected to the access module through communication and collects the operation status, refrigeration capacity setting and load rate of each air conditioner host, and calculates the operation capacity of each air conditioner host; and

S203: an operation capacity control module and an energy-saving benefit analysis module, which calculates the power consumption and energy-saving benefits of each air-conditioning main unit corresponding to multiple operation modes according to the load rate, operating capacity and power consumption adjustment of each air-conditioning main unit, and calculates Adjust the operation of each air conditioner main unit.

Among them, each operation mode is the low load rate shutdown mode, the minimum number of air conditioners mode and the user-defined parameter mode. The energy-saving operation mode adjusts the operation of each air conditioner.

Among them, the low load rate shutdown mode determines the priority of operation according to the load rate of each air conditioner.

Among them, the minimum number of air-conditioning units mode adds up the total operating capacity of each air-conditioning unit, and operates with the minimum number of air-conditioning units under the condition of meeting the total operating capacity.

Among them, the custom parameter mode determines the priority of operation according to the power consumption of each air conditioner.

Among them, the calculation of energy-saving benefits is to collect the operating capacity of each air conditioner and the power consumption per refrigeration ton before entering the power consumption intelligent automatic operation control mode, calculate the power consumption of the air conditioner before the improvement, and collect the number of operating units, after entering the power consumption intelligent automatic operation control mode. Based on the intelligent analysis results such as the operating capacity of each air conditioner and the power consumption per ton of refrigeration, the power consumption of the air conditioner after the improvement is calculated. Then, by improving the power consumption of the front air conditioner and improving the power consumption of the rear air conditioner, the energy saving benefit of optimizing the operating capacity of the air conditioner unit is calculated.

The calculation formula of energy saving benefit is as follows:

E1 is the power consumption _of the improved front air conditioner, n1 is the number of units running before the improvement, T1 _RTi is the operating capacity of the i-th air conditioner before the improvement, and E1 _RTi is the power consumption per refrigeration ton of the i-th air conditioner before the improvement.

_E2 is the power consumption of the improved air conditioner, n2 is the number of units in operation after the improvement, T2 _RTi is the operating capacity of the i-th air conditioner main unit after the improvement, and E2 _RTi is the power consumption per refrigeration ton of the i-th air conditioner main unit after the improvement.

E=((E ₁ -E ₂ )/E1)*100

E is the energy saving benefit.

Furthermore, using an actual implementation case, if there are 4 air conditioners in operation (operation status (S)=ON), the numbers are from 1 to 4, and the ice water inlet temperature (T _wi ) and outlet water temperature of each air conditioner are collected. Signals such as temperature (T _wo ), cooling water inlet temperature (T _ci ) and outlet water temperature (T _co ), and operating current (I), determine the full-load operation of the main air conditioner and calculate the average temperature difference of more than one full-load operation, and update it to The historical data of the average temperature difference in full-load operation. At the same time, the following air-conditioning host load rate and power consumption per refrigeration ton (KW/RT) conversion, as well as the air-conditioning host refrigeration capacity, are obtained. The results are as follows: Table 1 and Table 2:

Table 1

Air conditioner host Air conditioner host load rate (%) Power consumption per frozen ton (KW/RT) 1 100 0.80 2 75 0.70 3 50 1.00 4 25 1.30

Table 2

Air conditioner host 1 Air conditioner host 2 Air conditioner host 3 Air conditioner host 4 Freezing capacity = 50RT Freezing capacity = 50RT Freezing capacity = 50RT Freezing capacity = 100RT S_1=ON S_2=ON S_3=ON S_4=ON

The low load rate shutdown mode and the minimum number of air conditioners are explained as follows:

In the low load rate shutdown mode, firstly calculate the load rate of the main air conditioners. Assume that the load rates (η _i , i = 1 to 4) of the four air conditioner main units are 50%, 25%, 50% and 20% respectively. The calculation results of the main engine load rate, the operation status and refrigeration capacity of the air conditioners, and the operation capacity of the air conditioners are calculated, and the operating capacities of the first 4 air conditioners (T1 _RTi , i=1~4) are obtained as 25RT, 12.5RT, 25RT and 20RT respectively. . Before entering the low load rate shutdown mode, collect the above information to calculate the power consumption of the air conditioner before the improvement, E1=94.25KW. After entering the low load rate shutdown control mode, it is assumed that the shutdown control condition is less than 50% of the load rate air conditioner main unit, so the air conditioner main unit 2 and the air conditioner main unit 4 are turned off, and the air conditioner operating capacity with low load rate is transferred to other operating air conditioners. After analyzing the results of the shutdown control mode at low load rate, the operating capacities (T2 _RTi , i=1~4) of the four air conditioners after the improvement were obtained as 41.25RT, 0RT, 41.25RT and 0RT respectively, and the power consumption of the air conditioners after the improvement was calculated, E2=61.88KW. By improving the power consumption of the air conditioner before and after the improvement, the energy saving benefit of optimizing the operating capacity of the air conditioner is calculated as E = 34%, as shown in Table 3 and Table 4 below.

Table 3: Before low load rate shutdown mode, E1=94.25KW

Air conditioner host 1 Air conditioner host 2 Air conditioner host 3 Air conditioner host 4 η₁=50% η₂=25% η₃=50% η₄=20% T1_RT1=25RT T1_RT2=12.5RT T1_RT3=25RT T1_RT4=20RT

Table 4: After low load rate shutdown mode, E1=61.88KW

Air conditioner host 1 Air conditioner host 2 Air conditioner host 3 Air conditioner host 4 η₁=82.5% η₂=0% η₃=82.5% η₄=0% T2_RT1=41.25RT T2_RT2=61.88RT T2_RT3=41.25RT T2_RT4=0RT

In the mode of the minimum number of air conditioners, firstly calculate the load rate of the air conditioners. Assume that the load rates of the four air conditioners (η _i , i = 1 to 4) are 50%, 50%, 50% and 50% respectively. Based on the calculation results of the main engine load rate, the operating state and refrigeration capacity of the air conditioners, and the operating capacity of the air conditioners, the operating capacities of the first four air conditioners (T1 _RTi , i=1 to 4) were obtained as 25RT, 25RT, 25RT, and 50RT, respectively. Before entering the power consumption intelligent automatic operation control mode, collect the above information to calculate the power consumption of the air conditioner before the improvement, E1 = 125KW; after entering the control mode of the minimum number of air conditioners that meet the operating capacity, and meet the total operating capacity of the air conditioner, turn off the main air conditioner 1 and the air conditioner. The air conditioner host 2 maintains the air conditioner host 3 and the air conditioner host 4 at a high load rate and meets the total air conditioning operating capacity requirement. After analyzing the results of the control mode with the minimum number of air conditioners under the operating capacity, the operating capacities (T2 _RTi , i=1-4) of the four air conditioners after improvement were obtained as 0RT, 0RT, 41.65RT and 83.3RT respectively, and the improved air conditioners were calculated. Power consumption, E2=93.71KW. Then, by improving the power consumption of the air conditioner before and after improving the power consumption of the air conditioner, the energy saving benefit of optimizing the operating capacity of the air conditioner unit is calculated as E=25%, as shown in Table 5 and Table 6 below.

Table 5: Before low load rate shutdown mode, E1=125KW

Air conditioner host 1 Air conditioner host 2 Air conditioner host 3 Air conditioner host 4 η₁=50% η₂=50% η₃=50% η₄=50% T1_RT1=25RT T1_RT2=25RT T1_RT3=25RT T1_RT4=50RT

Table 6: After low load rate shutdown mode, E1=93.71KW

Air conditioner host 1 Air conditioner host 2 Air conditioner host 3 Air conditioner host 4 η₁=0% η₂=0% η₃=83.3% η₄=83.3% T2_RT1=0RT T2_RT2=0RT T2_RT3=41.65RT T2_RT4=83.3RT

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (6)

1. Automatic air conditioning operation capacity adjustment system, including: Load factor analysis module, which calculates the temperature of each air conditioner host according to the temperature of ice water inlet, ice water outlet temperature, cooling water inlet temperature, cooling water outlet temperature, historical average temperature difference of full-load operation and operating current of multiple air conditioners. load rate; an operation capacity analysis module, which calculates the operation capacity of each air conditioner main unit according to the operation state, refrigeration capacity setting and load rate of each air conditioner main unit; A load rate and power consumption conversion module, which converts the power consumption per refrigeration ton under the corresponding load rate of each air conditioner host according to the operation curve setting of each air conditioner host; an operation capacity control module, which adjusts the operation of each of the air conditioners according to the load rate, the operation capacity and the power consumption per refrigerated ton of the air conditioners; an energy-saving benefit analysis module, which calculates the power consumption and energy-saving benefit of each of the air conditioners; and A communication and access module, which provides the load ratio analysis module, the operation capacity analysis module, the load ratio and power consumption conversion module, the operation capacity control module, the energy saving benefit analysis module and each of the air conditioners host connection; Wherein the operation capacity control module and the energy saving benefit analysis module are used to calculate the power consumption of a plurality of operation modes according to the load rate, the operation capacity and the power consumption adjustment per refrigerated ton of each of the air conditioners. Corresponding power consumption and energy-saving benefits of each of the air conditioners, and adjusting the operation of each air conditioner; Each operation mode is a low load rate shutdown mode, a minimum number of air conditioners, and a custom parameter mode. After the energy-saving benefit analysis module calculates the power consumption and the energy-saving benefit of each operation mode, the operation The capacity control module adjusts the operation of each of the air conditioners according to the operation mode that conforms to the lowest power consumption and the highest energy-saving benefit. 2 . The automatic air conditioning operation capacity adjustment system according to claim 1 , wherein the operation curve of each of the air conditioners is set as a linear function, a multi-order function, or a multi-segment linear function. 3 . 3. A method for adjusting the operating capacity of an automatic air conditioner, comprising the following steps: The load rate analysis module is connected to the access module through communication and collects the ice water inlet temperature, ice water outlet temperature, cooling water inlet temperature, cooling water outlet temperature, historical average temperature difference and operating current of multiple air-conditioning hosts, and Calculate the load rate of each of the air conditioners; The operation capacity analysis module is connected with the access module through communication and collects the operation state, refrigeration capacity setting and load rate of each of the air conditioners, and calculates the operation capacity of each of the air conditioners; and An operation capacity control module and an energy-saving benefit analysis module, which calculate the power consumption of each of the air conditioners corresponding to a plurality of operation modes according to the load rate, the operation capacity and the power consumption adjustment per refrigerated ton of the air conditioners Electricity and energy-saving benefits, and adjust the operation of each of the air conditioners; Each operation mode is a low load rate shutdown mode, a minimum number of air conditioners, and a custom parameter mode. After the energy-saving benefit analysis module calculates the power consumption and the energy-saving benefit of each operation mode, the operation The capacity control module adjusts the operation of each of the air conditioners according to the operation mode that conforms to the lowest power consumption and the highest energy-saving benefit. 4 . The method for adjusting the operation capacity of automatic air conditioners according to claim 3 , wherein the low load rate shutdown mode determines the priority of operation according to the load rate of each air conditioner main unit, and the air conditioner main unit with a high load rate determines the operation priority. 5 . For priority operation, the air conditioner with a low load rate is given priority to stop. 5 . The method for adjusting the operation capacity of automatic air conditioners according to claim 3 , wherein the mode of the minimum number of air conditioners is to add up the total operation capacity of each of the air conditioners, and to perform the following operation under the condition that the total operation capacity is met. 6 . A minimum number of the air conditioners operate. 6 . The method for adjusting the operation capacity of an automatic air conditioner according to claim 3 , wherein the user-defined parameter mode determines the priority of operation according to the power consumption of each of the air conditioners, and the air conditioner with high power consumption is: 6 . Priority is given to shutdown, and the air conditioner with low power consumption is given priority to operate.

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