CN111914404B - Method for acquiring performance curve of air conditioning system cold machine based on measured data - Google Patents
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Abstract
The invention discloses a method for acquiring a performance curve of a refrigerating machine of an air conditioning system based on measured data, which comprises the following steps of S1: data acquisition: 1) And (4) installing measuring points, and installing each sensor at a required position in the system. 2) Connecting the measuring point data with a platform database for storing data through a network, and uniformly storing the acquired data into the platform database; s2: and (3) data analysis and processing: and performing calculation fitting according to the collected data analysis. Specifically, calculating and fitting steps: 1) And calculating refrigerating capacity of the refrigerator and heat exchange capacity of a condensation side to perform energy balance check. 2) Calculating the load rate and the end difference of the cold machine; 3) Calculating the energy efficiency ratio of the cold machine; 4) And fitting functional relations of different cold machine load rates and energy efficiency ratios according to the cold machine types. The invention obtains the running curve of the actual running performance of the refrigerator on the basis of the historical measured data, and has the characteristics of simple and convenient calculation, good fitting result and good universality.
Description
Technical Field
The invention belongs to the field of central air-conditioning system equipment operation and data monitoring and the field of warm-ventilation air-conditioning system measuring point installation, and particularly relates to a method for acquiring a cold machine performance curve of an air-conditioning system based on measured data.
Background
In a cold station of a central air conditioner, a plurality of cold machines are commonly used for refrigerating, and cold supply is realized by adjusting the start and stop of different cold machines, so that the cold requirement at the tail end of the system is met. In the existing cold station control system, equipment operators usually estimate and start several cold machines according to experience of terminal cold quantity requirements, and sometimes the experience is inaccurate to cause energy waste, so a reasonable operation adjusting method is adopted to be one of main ways for improving the energy utilization efficiency of a central air-conditioning system, a cold machine actual operation equipment curve is one of the basis for optimizing the operation of the air-conditioning system, and the purpose of obtaining the cold machine actual operation equipment curve is to realize reasonable allocation of the number and load rate of the running cold machines, so that the high-efficiency, safe and energy-saving operation targets of the air-conditioning system are achieved.
Disclosure of Invention
In order to solve the problems, the invention discloses a method for acquiring a performance curve of a cold machine of an air conditioning system based on measured data, which is used for acquiring an actual operation performance operation curve of the cold machine on the basis of historical measured data and has the advantages of simple and convenient calculation, good fitting result and good universality.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for acquiring a performance curve of a cold machine of an air conditioning system based on measured data comprises the following steps:
s1: data acquisition: firstly, data of all measuring points installed in the heating ventilation air conditioner are connected with a platform database for storing data through a network, and the collected data are uniformly stored in the platform database.
S2: and (3) data analysis and processing:
1) Calculating refrigerating capacity and heat exchange capacity of condensing side of refrigerating machine to perform energy balance check
(1) Refrigerating capacity of refrigerator
Obtaining the heat exchange quantity of the evaporating side of the cold machine, namely the refrigerating capacity Q of the cold machine according to the temperature and the flow of the inlet and outlet water of an evaporator of the cold machine e ：
In the formula: qe is refrigerating capacity of the refrigerator, kW;
G e for evaporating side water flow, m 3 /h；
T e,in The water inlet temperature of the evaporator is DEG C;
T e,out is the temperature of the outlet water of the evaporator at DEG C.
(2) Heat exchange amount of condensation side
Obtaining the heat exchange quantity Q of the condenser side of the cold machine according to the temperature and the flow of the inlet and outlet water of the evaporator of the cold machine c ：
In the formula: qc is the heat exchange quantity at the side of the condenser of the cold machine, kW;
G c m is the water flow of the condensation side 3 /h；
T c，in The water inlet temperature of the condenser is DEG C;
T c，out is the temperature of the outlet water of the condenser at DEG C.
(3) Energy balance check
The heat exchange quantity of the evaporation side of the cold machine, the heat exchange quantity of the condensation side of the cold machine and the power of the cold machine meet the law of energy conservation:
Q c ＝Q e +P 2-3
in the formula: p is the cold machine power, kW.
Considering the existence of errors in the actual measurement, the energy imbalance rate of the measured data is checked:
when the unbalance rate is within +/-20%, the error of the measured value is considered to be within an acceptable range, otherwise, the correctness of each measured value is checked;
2) Calculating the load factor and end difference of the cold machine
Calculating the load rate, the end difference and the energy efficiency ratio of the refrigerator under two conditions according to the data types contained in the historical operating data of the refrigerator in operation;
case 1: the evaporation temperature and the condensation temperature in the cold machine;
(1) load factor PLR
The working performance of the refrigerator is related to the load factor of the refrigerator, and the load factor of the refrigerator is calculated as follows:
in the formula: PLR is the load factor of the refrigerator;
Q rated the rated refrigerating capacity of the refrigerator is kW.
(2) End difference
The end difference between the evaporator and the condenser affects the DCOP value of the chiller, which is related to the working performance of the chiller, so the end difference needs to be calculated:
T e ＝T e，out -ΔT e 2-6
ΔT c ＝T c -T c，out 2-7
in the formula: t is a unit of e The cold machine evaporation temperature, DEG C;
ΔT e end difference at evaporator side, DEG C;
T c the condensing temperature of the refrigerator is lower than DEG C;
ΔT c condenser side end difference, deg.C.
(3) PLR and Δ T obtained by the above calculation c 、ΔT e Fitting a linear function relation:
ΔT e ＝aPLR+b 2-8
ΔT c ＝cPLR+d 2-9
obtaining coefficients a, b, c and d;
case 2: the evaporation temperature and the condensation temperature in the non-cooler;
(1) according to PLR and Δ T obtained in case 1 c 、ΔT e Functional relation, determining Δ T by PLR c 、ΔT e ：
ΔT e ＝aPLR+b 2-8
ΔT c ＝cPLR+d 2-9
(2) To calculate the energy efficiency ratio of the cooler, the evaporating temperature T of the cooler needs to be calculated e And condensation temperature T c ：
T e ＝T e，out -ΔT e 2-6
ΔT c ＝T c -T c，out 2-7
3) Calculating the energy efficiency ratio of the cold machine
When the measured value meets the energy balance check, calculating the cold machine energy efficiency ratio COP, DCOP and ICOP:
4) Fitting functional relation between different cold machine load rates and energy efficiency ratios according to cold machine types
If the refrigerator is a centrifugal unit, fitting a quadratic function relation by the PLR and the DCOP obtained by the calculation:
DCOP＝ePLR 2 +f PLR+g 2-13
obtaining coefficients e, f and g;
if the cold machine is a screw unit, fitting into a linear function relation:
DCOP＝ePLR+f 2-14
the coefficients e, f are obtained.
The invention has the beneficial effects that:
the method for acquiring the performance curve of the air conditioning system cooler based on the measured data obtains the actual operation performance operation curve of the cooler on the basis of the historical measured data, and has the advantages of simplicity and convenience in calculation, good fitting result and good universality.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 shows the results of the PLR and DCOP fitting in case 1 of the centrifuge set and the measured parameters in example 1;
FIG. 3 shows the PLR and DCOP fitting results for the centrifuge set of example 2, measurement parameters case 2;
FIG. 4 shows the fitting results of PLR and DCOP for the screw set of example 1 under measurement parameter condition 1;
FIG. 5 shows the PLR and DCOP fitting results for the screw set of example 1, measured parameters case 2.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and detailed description, which will be understood as being illustrative only and not limiting in scope.
Example 1: (centrifuge Unit, measurement parameter case 1)
S1: data acquisition:
1) Measuring point mounting
The sensors are installed at desired locations within the system.
2) And connecting the data of each measuring point with a platform database for storing the data through a network, and uniformly storing the acquired data into the platform database.
The calculated fit was made on the collected data for one month continuously, with a data collection interval of 5 minutes.
S2: and (3) data analysis and processing:
1) And calculating refrigerating capacity of the refrigerator and heat exchange capacity of a condensation side to perform energy balance check.
(1) Refrigerating capacity of refrigerator
According to the temperature and flow of the inlet and outlet water of the evaporator of the cooler, the heat exchange quantity of the evaporating side of the cooler, namely the refrigerating quantity Q of the cooler can be obtained e ：
(2) Heat exchange amount of condensation side
The heat exchange quantity Q of the condenser side of the cooler can be obtained according to the temperature and the flow of the inlet water and the outlet water of the condenser of the cooler c ：
(3) Energy balance check
The heat exchange quantity of the evaporation side of the cooler, the heat exchange quantity of the condensation side of the cooler and the power of the cooler meet the law of energy conservation:
Q c ＝Q e +P 2-3
considering the error in the actual measurement, the energy imbalance rate of the measured data should be checked:
when the unbalance rate is within ± 20%, the measurement value error is considered to be within an acceptable range, otherwise the correctness of each measurement value should be checked.
2) Calculating load rate and end difference of cold machine
According to the data types contained in the historical operation data of the cold machine in the cold machine operation, the cold machine load rate, the end difference and the cold machine energy efficiency ratio can be calculated under two conditions.
Case 1: the evaporation temperature and the condensation temperature in the cold machine are measured;
(1) load factor PLR
The working performance of the refrigerator is related to the load factor of the refrigerator, and the load factor of the refrigerator is calculated.
(2) End difference
The end difference between the evaporator and the condenser affects the value of the DCOP of the cooler, and the value is related to the working performance of the cooler, so that the end difference needs to be calculated:
T e ＝T e，out -ΔT e 2-6
ΔT c ＝T c -T c，out 2-7
(3) PLR and Δ T obtained by the above calculation c 、ΔT e Fitting a linear function relation:
ΔT e ＝aPLR+b 2-8
ΔT c ＝cPLR+d 2-9
coefficients a, b, c, d are obtained.
3) Calculating the energy efficiency ratio of the cold machine
And when the measured value meets the energy balance check, calculating cold energy efficiency ratios (COP), DCOP and ICOP:
4) Fitting functional relation between different cold machine load rates and energy efficiency ratios according to cold machine types
And fitting a quadratic function relation formula by the PLR and the DCOP obtained by the calculation if the refrigerator is a centrifugal unit:
DCOP＝ePLR 2 +f PLR+g 2-13
coefficients e, f, g are obtained. The fitting results are shown in fig. 2.
Example 2:
s1: data acquisition:
1) Measuring point mounting
The sensors are installed at desired locations within the system.
2) And connecting the data of each measuring point with a platform database for storing the data through a network, and uniformly storing the acquired data into the platform database.
The calculated fit was made on the collected data for one month continuously, with a data collection interval of 5 minutes.
S2: and (3) data analysis and processing:
1) And calculating refrigerating capacity of the refrigerator and heat exchange capacity of a condensation side to perform energy balance check.
(1) Refrigerating capacity of refrigerator
According to the temperature and flow of the inlet and outlet water of the evaporator of the cooler, the heat exchange quantity of the evaporating side of the cooler, namely the refrigerating quantity Q of the cooler can be obtained e ：
(2) Heat exchange amount of condensation side
The heat exchange quantity Q of the condenser side of the cooler can be obtained according to the temperature and the flow of the inlet water and the outlet water of the condenser of the cooler c ：
(3) Energy balance check
The heat exchange quantity of the evaporation side of the cold machine, the heat exchange quantity of the condensation side of the cold machine and the power of the cold machine meet the law of energy conservation:
Q c ＝Q e +P 2-3
considering the presence of errors in the actual measurement, the energy imbalance rate of the measured data should be checked:
when the unbalance rate is within ± 20%, the measurement value error is considered to be within an acceptable range, otherwise the correctness of each measurement value should be checked.
2) Calculating load rate and end difference of cold machine
According to the data types contained in the historical operation data of the cold machine in the cold machine operation, the cold machine load rate, the end difference and the cold machine energy efficiency ratio can be calculated according to two conditions.
Case 2: the evaporation temperature and the condensation temperature in the non-cooler;
(1) according to the PLR and Δ T obtained in case 1 c 、ΔT e Functional relation, Δ T can be found by PLR c 、ΔT e 。
ΔT e ＝aPLR+b 2-8
ΔT c ＝cPLR+d 2-9
(2) To calculate the energy efficiency ratio of the cooler, the evaporating temperature T of the cooler needs to be calculated e And the condensation temperature T c ：
T e ＝T e，out -ΔT e 2-6
ΔT c ＝T c -T c，out 2-7
3) Calculating the energy efficiency ratio of the cooler
And when the measured value meets the energy balance check, calculating cold energy efficiency ratios (COP), DCOP and ICOP:
4) Fitting functional relation between different cold machine load rates and energy efficiency ratios according to cold machine types
And fitting a quadratic function relation formula by the PLR and the DCOP obtained by the calculation if the refrigerator is a centrifugal unit:
DCOP＝ePLR 2 +f PLR+g 2-13
coefficients e, f, g are obtained. The fitting results are shown in fig. 3.
Example 3:
s1: data acquisition:
1) Measuring point mounting
The sensors are installed at desired locations within the system.
2) And connecting the data of each measuring point with a platform database for storing the data through a network, and uniformly storing the acquired data into the platform database.
The calculated fit was made on the collected data for one month continuously, with a data collection interval of 5 minutes.
S2: and (3) data analysis and processing:
1) And calculating refrigerating capacity of the refrigerator and heat exchange capacity of a condensation side to perform energy balance check.
(1) Refrigerating capacity of refrigerator
The heat exchange quantity of the evaporation side of the cooler, namely the refrigerating quantity Q of the cooler can be obtained according to the temperature and the flow of the inlet water and the outlet water of the evaporator of the cooler e ：
(2) Heat exchange amount of condensation side
The heat exchange quantity Q of the condenser side of the cooler can be obtained according to the temperature and the flow of the inlet water and the outlet water of the condenser of the cooler c ：
(3) Energy balance check
The heat exchange quantity of the evaporation side of the cold machine, the heat exchange quantity of the condensation side of the cold machine and the power of the cold machine meet the law of energy conservation:
Q c ＝Q e +P 2-3
considering the presence of errors in the actual measurement, the energy imbalance rate of the measured data should be checked:
when the unbalance rate is within ± 20%, the measurement value error is considered to be within an acceptable range, otherwise the correctness of each measurement value should be checked.
2) Calculating load rate and end difference of cold machine
According to the data types contained in the historical operation data of the cold machine in the cold machine operation, the cold machine load rate, the end difference and the cold machine energy efficiency ratio can be calculated under two conditions.
Case 1: the evaporation temperature and the condensation temperature in the cold machine are measured;
(1) load factor PLR
The working performance of the refrigerator is related to the load factor of the refrigerator, and the load factor of the refrigerator is calculated.
(2) End difference
The end difference between the evaporator and the condenser affects the DCOP value of the chiller, which is related to the working performance of the chiller, so the end difference needs to be calculated:
T e ＝T e，out -ΔT e 2-6
ΔT c ＝T c -T c，out 2-7
(3) PLR and Δ T obtained by the above calculation c 、ΔT e Fitting a linear function relation:
ΔT e ＝aPLR+b 2-8
ΔT c ＝cPLR+d 29
coefficients a, b, c, d are obtained.
3) Calculating the energy efficiency ratio of the cooler
And when the measured value meets the energy balance check, calculating cold energy efficiency ratios (COP), DCOP and ICOP:
4) Fitting functional relation between different cold machine load rates and energy efficiency ratios according to cold machine types
And fitting a linear function relation by the PLR and the DCOP obtained by the calculation if the cold machine is a screw machine set:
DCOP＝ePLR+f 2-13
the coefficients e, f are obtained. The fitting results are shown in fig. 4.
Example 4:
s1: data acquisition:
1) Measuring point mounting
The sensors are installed at desired locations within the system.
2) And connecting the data of each measuring point with a platform database for storing the data through a network, and uniformly storing the acquired data into the platform database.
The calculated fit was made from the collected data for one month continuously, with a data collection interval of 5 minutes.
S2: and (3) data analysis and processing:
1) And calculating refrigerating capacity of the refrigerator and heat exchange capacity of a condensation side to perform energy balance check.
(1) Refrigerating capacity of refrigerator
The heat exchange quantity of the evaporation side of the cooler, namely the refrigerating quantity Q of the cooler can be obtained according to the temperature and the flow of the inlet water and the outlet water of the evaporator of the cooler e ；
(2) Heat exchange amount of condensation side
According to the temperature and flow of the water entering and leaving the condenser of the refrigerator, the heat exchange quantity Q at the condenser side of the refrigerator can be obtained c ；
(3) Energy balance check
The heat exchange quantity of the evaporation side of the cooler, the heat exchange quantity of the condensation side of the cooler and the power of the cooler meet the law of energy conservation:
Q c ＝Q e +P 2-3
considering the presence of errors in the actual measurement, the energy imbalance rate of the measured data should be checked:
when the unbalance rate is within ± 20%, the measurement value error is considered to be within an acceptable range, otherwise the correctness of each measurement value should be checked.
2) Calculating load rate and end difference of cold machine
According to the data types contained in the historical operation data of the cold machine in the cold machine operation, the cold machine load rate, the end difference and the cold machine energy efficiency ratio can be calculated under two conditions.
Case 2: the evaporation temperature and the condensation temperature in the non-cooler;
(1) according to the PLR and Δ T obtained in case 1 c 、ΔT e Functional relation, Δ T can be found by PLR c 、ΔT e 。
ΔT e ＝aPLR+b 2-8
ΔT c ＝cPLR+d 2-9
(2) To calculate the energy efficiency ratio of the cold machine, the evaporation temperature T of the cold machine needs to be calculated e And the condensation temperature T c ：
T e ＝T e，out -ΔT e 2-6
ΔT c ＝T c -T c，out 2-7
3) Calculating the energy efficiency ratio of the cooler
When the measured value meets the energy balance check, calculating the cold machine energy efficiency ratio COP, DCOP and ICOP:
4) Fitting functional relation between different cold machine load rates and energy efficiency ratios according to cold machine types
And fitting a linear function relation by the PLR and the DCOP obtained by the calculation if the cold machine is a screw machine set:
DCOP＝ePLR+f 2-13
the coefficients e, f are obtained. The fitting results are shown in fig. 5.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (1)
1. A method for acquiring performance curves of a refrigerating machine of an air conditioning system based on measured data is characterized by comprising the following steps: the method comprises the following steps:
s1: data acquisition:
1) Measuring point mounting
Installing each sensor at a required position in the system;
2) Connecting the data of each measuring point with a platform database for storing the data through a network, and uniformly storing the acquired data into the platform database;
s2: and (3) data analysis and processing:
1) Calculating refrigerating capacity and heat exchange capacity of condensing side of refrigerating machine to perform energy balance check
(1) Refrigerating capacity of refrigerator
Obtaining the heat exchange quantity of the evaporating side of the cold machine, namely the refrigerating capacity Q of the cold machine according to the temperature and the flow of the inlet and outlet water of an evaporator of the cold machine e ：
In the formula: qe is refrigerating capacity of the refrigerator, kW;
G e for evaporating side water flow, m 3 /h；
T e,in The water inlet temperature of the evaporator is DEG C;
T e,out the temperature of the outlet water of the evaporator is DEG C;
(2) heat exchange amount of condensation side
Obtaining the heat exchange quantity Q of the condenser side of the cooler according to the temperature and the flow of the inlet and outlet water of the evaporator of the cooler c ：
In the formula: qc is the heat exchange quantity at the side of the condenser of the cold machine, kW;
G c m is the water flow of the condensation side 3 /h；
T c,in The water inlet temperature of the condenser is DEG C;
T c,out the temperature of the outlet water of the condenser is lower than DEG C;
(3) energy balance check
The heat exchange quantity of the evaporation side of the cold machine, the heat exchange quantity of the condensation side of the cold machine and the power of the cold machine meet the law of energy conservation:
Q c ＝Q e +P 2-3
in the formula: p is the power of the refrigerator, kW;
considering the existence of errors in the actual measurement, the energy imbalance rate of the measured data is checked:
in the formula: UR is the rate of energy imbalance;
when the unbalance rate is within +/-20%, the error of the measured value is considered to be within an acceptable range, otherwise, the correctness of each measured value is checked;
2) Calculating the load factor and end difference of the cold machine
Calculating the load rate, the end difference and the energy efficiency ratio of the refrigerator under two conditions according to the data types contained in the historical operating data of the refrigerator in operation;
case 1: the evaporation temperature and the condensation temperature in the cold machine;
(1) load factor PLR
The working performance of the refrigerator is related to the load factor of the refrigerator, and the load factor of the refrigerator is calculated as follows:
in the formula: PLR is the load factor of the refrigerator;
Q rated the rated refrigerating capacity of the refrigerator is kW;
(2) end difference
The end difference between the evaporator and the condenser affects the DCOP value of the chiller, which is related to the working performance of the chiller, so the end difference needs to be calculated:
T e ＝T e，out -ΔT e 2-6
ΔT c ＝T c -T c，out 2-7
in the formula: t is e The cold machine evaporation temperature, DEG C;
ΔT e evaporator side end difference, deg.C;
T c the cold machine condensation temperature, DEG C;
ΔT c condenser side end difference, deg.C;
(3) PLR and Δ T obtained by the above calculation c 、ΔT e Fitting a linear function relation:
ΔT e ＝aPLR+b 2-8
ΔT c ＝cPLR+d 2-9
obtaining coefficients a, b, c and d;
case 2: the evaporation temperature and the condensation temperature in the non-cooler;
(1) according to the PLR and Δ T obtained in case 1 c 、ΔT e Functional relation, determining Δ T by PLR c 、ΔT e ：
ΔT e ＝aPLR+b 2-8
ΔT c ＝cPLR+d 2-9
(2) To calculate the energy efficiency ratio of the cooler, the evaporating temperature T of the cooler needs to be calculated e And the condensation temperature T c ：
T e ＝T e，out -ΔT e 2-6
ΔT c ＝T c -T c，out 2-7
3) Calculating the energy efficiency ratio of the cooler
And when the measured value meets the energy balance check, calculating cold energy efficiency ratios (COP), DCOP and ICOP:
4) Fitting functional relation between different cold machine load rates and energy efficiency ratios according to cold machine types
If the refrigerator is a centrifugal unit, fitting a quadratic function relation through the PLR and the DCOP obtained by calculation:
DCOP＝ePLR 2 +fPLR+g 2-13
obtaining coefficients e, f and g;
if the cold machine is a screw unit, fitting into a linear function relation:
DCOP＝ePLR+f 2-14
the coefficients e, f are obtained.
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| CN114427742B (en) * | 2022-01-27 | 2022-09-30 | 广州施杰节能科技有限公司 | Central air-conditioning cold station energy efficiency control method, device, equipment and storage medium |
| CN114623570B (en) * | 2022-02-11 | 2023-07-21 | 武汉中电节能有限公司 | Method for calculating instantaneous refrigeration power of air conditioner refrigeration host |
| WO2024012545A1 (en) * | 2022-07-13 | 2024-01-18 | 青岛海信日立空调系统有限公司 | Air conditioning system and method for determining energy efficiency ratio thereof |
| CN116489977B (en) * | 2023-06-21 | 2023-09-15 | 广州豪特节能环保科技股份有限公司 | Central variable energy-saving cooling control method, system and medium for data center |
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