CN111122189B - Method for measuring uncertainty of test table position of gas equipment and method for measuring thermal efficiency - Google Patents
Method for measuring uncertainty of test table position of gas equipment and method for measuring thermal efficiency Download PDFInfo
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Abstract
The invention relates to a method for measuring uncertainty of a test station position of gas equipment and a method for measuring heat efficiency, which are characterized in that the uncertainty of the whole gas equipment measuring system is obtained according to the uncertainty of each standard gas equipment in the gas equipment measuring system, a confidence factor is obtained according to the expected heat efficiency value of the gas equipment to be measured and the actual heat efficiency value of the gas equipment to be measured after the gas equipment to be measured is placed on the test station position, a standard normal distribution function table is searched by utilizing the confidence factor to obtain the uncertainty of the test station position where the gas equipment to be measured is placed, the operation is repeated in the way, after the uncertainty of each test station position in the gas equipment measuring system is measured, which test station position in the gas equipment measuring system is relatively more accurate can be judged, the gas equipment to be measured can be placed on the test station positions with smaller uncertainty, therefore, the accuracy of the thermal efficiency performance test of the gas equipment is improved.
Description
Technical Field
The invention relates to the field of performance testing of gas equipment, in particular to a method for measuring uncertainty of a test table position of the gas equipment and a method for measuring heat efficiency.
Background
Gas equipment such as gas stoves, gas water heaters and the like gradually become common and indispensable equipment in daily life of people. The heat efficiency performance of the gas equipment is directly related to the use experience effect of people.
In order to determine the thermal efficiency performance of the gas equipment in advance, a gas equipment manufacturer usually needs to place the gas equipment to be tested on a corresponding test table position in a gas appliance measurement system in an experiment, and the test table position is connected with auxiliary components for tests such as a gas flowmeter, a thermometer and the gas meter, so that test work is started aiming at the test table position to determine whether the thermal efficiency performance of the gas equipment on the test table position reaches the required qualified rate.
However, after the gas device to be tested is placed in the testing station of the gas appliance measuring system, because the thermal efficiency performance test result of each gas device is usually related to the uncertainty of the testing station, and the testing station is affected by the uncertainty of the gas inflow meter, the thermometer, the gas pressure meter and other accessory components, this will result in that the uncertainty of the testing station placed in the gas device to be tested cannot be accurately known, and it is difficult to effectively determine the thermal efficiency performance of the gas device to be tested. Therefore, in the process of testing the thermal efficiency performance of the gas equipment, the accuracy of the uncertainty of the test table position in the gas appliance measurement system is important.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a method for measuring uncertainty of a test station of a gas appliance in view of the above prior art. The method can accurately determine the uncertainty of the station to be tested in the gas appliance measuring system, so that an experimenter can conveniently place the subsequent gas appliance needing to determine the thermal efficiency performance on the testing station with smaller uncertainty, and the testing accuracy of the thermal efficiency performance of the gas appliance is improved.
The second technical problem to be solved by the present invention is to provide a method for measuring thermal efficiency of a gas combustion apparatus in view of the above prior art.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the method for measuring the uncertainty of the test station position of the gas equipment is characterized by comprising the following steps 1-9:
step 1, testing and obtaining an A-type evaluation value of uncertainty of each standard gas device in a gas appliance measurement system in advance; the number of standard gas Equipment in the gas appliance measuring system is set to be N, and the ith standard gas Equipment in the gas appliance measuring system is marked as EquipmentiI is more than or equal to 1 and less than or equal to N; equipment of standard gas EquipmentiIs marked as a class A rating of uncertainty
Step 2, obtaining A-class evaluation values and B-class evaluation values of uncertainty of each accessory part associated with the thermal efficiency performance of each standard gas equipment;
wherein the standard gas facility is setPrepare EquipmentiThermal efficiency performance and MiAn accessory unit is associated, MiThe jth Accessory component in the Accessory component association is marked as Accessi,jSaid Accessory part Accessi,jClass A rating of uncertainty flag
The Accessory part Accessi,jClass B rating of uncertainty flag
Step 3, obtaining the uncertainty of the synthetic standard of each accessory part according to the A-class evaluation value and the B-class evaluation value of the uncertainty corresponding to each accessory part; wherein the Accessory part Accessi,jThe synthetic standard uncertainty marker of
Step 4, correspondingly obtaining a B-type evaluation value of the uncertainty of each standard gas equipment according to the known sensitivity coefficient of each accessory part and the obtained synthetic standard uncertainty of each accessory part; wherein the Accessory part Accessi,jIs marked as
The standard gas EquipmentiIs marked as a class B rating for uncertainty
Step 5, respectively obtaining the combined standard uncertainty of each standard gas appliance according to the A-class evaluation value and the B-class evaluation value of the uncertainty of each standard gas appliance in the gas appliance measuring system; wherein, the standard gas EquipmentiThe synthetic standard uncertainty marker of
Step 6, obtaining the uncertainty of the gas appliance measuring system according to the synthesis standard uncertainty of each standard gas device in the obtained gas appliance measuring system; wherein the uncertainty flag of the gas appliance measurement system is uSystem：
Step 7, after the gas equipment to be tested is placed on a station to be tested in the gas appliance measuring system, acquiring the actual thermal efficiency value of the gas equipment to be tested; the gas Equipment to be tested is marked as Equipment', and the actual thermal efficiency value of the gas Equipment to be tested is marked as etaPractice of；
Step 8, obtaining a confidence factor for searching a standard normal distribution function table according to the uncertainty of the obtained gas appliance measuring system, the expected heat efficiency value aiming at the gas equipment to be tested and the actual heat efficiency value of the gas equipment to be tested; wherein the expected value of the thermal efficiency of the gas equipment to be tested is marked as etaExpectation ofThe confidence factor is marked as k:
step 9, in the standard normal distribution function tableFinding and obtaining a probability distribution function value corresponding to the confidence factor, taking the found probability distribution function value as an unqualified probability representing the thermal efficiency performance of the gas equipment to be tested, calculating to obtain a qualified probability of the thermal efficiency performance of the gas equipment to be tested, and taking the obtained unqualified probability as an uncertainty value of a station to be tested where the gas equipment to be tested is placed; the probability distribution function value corresponding to the confidence factor k is marked as phi (x), and the qualified probability of the thermal efficiency performance of the gas equipment to be tested is marked as pQualifiedAnd the uncertainty value of the station to be tested placed on the gas equipment to be tested is marked as uStation to be tested：
pQualified＝1-Φ(x)，uStation to be tested＝Φ(x)。
Further, in the method for measuring uncertainty of a test stand position of a gas appliance, in step 1, the process of obtaining a test value of a class a evaluation of uncertainty of any standard gas appliance in the gas appliance measurement system includes the following steps a1 to a 4:
step a1, repeatedly executing W times of independent thermal efficiency performance measurement work under the same test conditions aiming at any standard gas equipment to obtain W thermal efficiency performance values of any standard gas equipment; wherein the W-th thermal efficiency performance value of the W thermal efficiency performance values is labeled as etaw，1≤w≤W；
Step a2, calculating to obtain a mathematical average value of the thermal efficiency performance of any standard gas equipment according to the obtained W thermal efficiency performance values of any standard gas equipment; wherein the heat efficiency performance arithmetic mean value of any standard gas equipment is marked as
Step a3, calculating according to each thermal efficiency performance value and thermal efficiency performance of any standard gas equipmentThe number average value is obtained to obtain the standard deviation of the thermal efficiency performance test of any standard gas equipment; wherein the standard deviation of the thermal efficiency performance test of any standard gas equipment is marked as sigmaη：
A4, taking the standard deviation of the thermal efficiency performance test of any standard gas equipment as the A-type evaluation value of the uncertainty of any standard gas equipment; wherein, any standard gas EquipmentiIs marked as a class A rating of uncertainty
In step 3, the class a rating and the class B rating of the uncertainty of any accessory in the gas appliance measurement system are provided by the provider of the corresponding accessory.
In a further improvement, in the method for measuring the uncertainty of the test stand position of the gas appliance, in step 3, the class a rating of the uncertainty of any accessory in the gas appliance measurement system is provided by a provider of the corresponding accessory, and the class B rating of the uncertainty of any accessory in the gas appliance measurement system is calculated in the following manner from step B1 to step B4:
b1, repeating U times of independent performance measurement work on the same performance index aiming at any accessory component under the same performance test condition to obtain a U individual performance index measured value of any accessory component; wherein the U-th performance index measurement value in the U-th performance index measurement values is marked as zetauU is more than or equal to 1 and less than or equal to U; the performance index of the accessory component is related to the thermal efficiency performance of the corresponding standard gas equipment;
b2, calculating the performance index measurement arithmetic mean value of any accessory part according to the obtained U performance index measurement value of any accessory part; wherein the performance index measurement arithmetic mean of any accessory component is marked as
B3, obtaining the standard deviation of any accessory part according to the performance index measured value and the performance index measurement arithmetic mean value; wherein the standard deviation of the performance measure of any of the accessory components is denoted as σζ：
Step b4, using the measured standard deviation of the performance index of any accessory part as the A-type evaluation value of the uncertainty of any accessory part; wherein any one of the Accessory parts is an Accessi,jIs marked as a class A rating of uncertainty
Specifically, in the method for measuring the uncertainty of the test stand position of the gas appliance, the accessory components in the gas appliance measuring system are any combination of a thermometer, a barometer, a gas flow meter, a pressure gauge and a timer.
The technical scheme adopted by the invention for solving the second technical problem is as follows: a method for measuring the thermal efficiency of a gas facility, which comprises the following steps C1-C4:
step C1, placing the gas equipment needing to determine the thermal efficiency on a test bench with minimum uncertainty in the gas appliance measuring system, and starting the gas equipment and the gas appliance measuring system;
step C2, acquiring a water inlet temperature value and a water outlet temperature value corresponding to the gas equipment; wherein the inlet water temperature value is marked as t1The outlet water temperature value is marked as t2；
Step C3, acquiring the hot water outlet amount, the actually measured gas low heat value and the actually measured gas flow corresponding to the gas equipment; wherein the hot water outlet quantity is marked as M, and the actually measured gas low heating value is marked as Q1And the measured gas flow mark is VConsumption unit；
Step C4, setting a gas flow correction coefficient, and obtaining the heat efficiency of the gas equipment according to the water inlet temperature value, the water outlet temperature value, the hot water outlet amount, the actually measured gas low heat value, the actually measured gas flow and the gas flow correction coefficient; wherein the gas flow correction coefficient is marked as f1The thermal efficiency of the gas-fired plant is marked as η:
Compared with the prior art, the invention has the advantages that:
firstly, obtaining the uncertainty of the whole gas appliance measuring system by aiming at the uncertainty of each standard gas appliance in the gas appliance measuring system, obtaining a confidence factor for searching a standard normal distribution function table according to the uncertainty of the gas appliance measuring system, the expected heat efficiency value of the gas appliance to be measured and the actual heat efficiency value of the gas appliance to be measured after the gas appliance to be measured is placed on a to-be-tested station of the gas appliance measuring system, obtaining the uncertainty value of the test station where the gas appliance to be measured is placed by searching the standard normal distribution function table by using the confidence factor, repeating the execution in the above way, and judging which test station in the gas appliance measuring system is relatively more accurate after the uncertainty of each test station in the gas appliance measuring system is measured, namely the uncertainty value of the test station is smaller, the test station is relatively more reliable and accurate, and analysis and correction of the test station with high uncertainty or abnormity are facilitated; therefore, when the thermal efficiency performance of the gas equipment is tested, the gas equipment to be tested can be placed on the test table positions with smaller uncertainty, so that the accuracy of the thermal efficiency performance test of the gas equipment is improved;
secondly, in the invention, the uncertainty of each standard gas appliance in the gas appliance measuring system is calculated and combined with the uncertainty of each accessory component influencing the performance of the standard gas appliance, so that a relationship between the uncertainty of the standard gas appliance and the uncertainty of each accessory component which can be observed in a quantification manner is established, experimenters can correct and adjust relevant parameters of the corresponding accessory components according to the condition of each test station, the uncertainty of each accessory component and the uncertainty of each test station are reduced, the uncertainty of the whole gas appliance measuring system is reduced, and finally, each adjusted accessory component and each adjusted test station meet the test regulation requirement of the subsequent gas appliance to be tested.
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Fig. 1 is a schematic flow chart of a method for measuring uncertainty of a test station of a gas-fired device in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Referring to fig. 1, the method for measuring uncertainty of a test station position of a gas device in this embodiment includes the following steps 1 to 9:
step 1, testing and obtaining an A-type evaluation value of uncertainty of each standard gas device in a gas appliance measurement system in advance; wherein, the number of standard gas devices in the gas appliance measuring system is set to be N, and the gas appliance is used for measuringThe ith standard gas Equipment in the system is marked as EquipmentiI is more than or equal to 1 and less than or equal to N; equipment of standard gas EquipmentiIs marked as a class A rating of uncertainty
In this embodiment, the process of obtaining the class a evaluation value of the uncertainty of any standard gas appliance in the gas appliance measurement system includes the following steps a 1-a 4:
step a1, repeatedly executing W times of independent thermal efficiency performance measurement work under the same test conditions aiming at any standard gas equipment to obtain W thermal efficiency performance values of any standard gas equipment; wherein the W-th thermal efficiency performance value of the W thermal efficiency performance values is labeled as etaw，1≤w≤W；
Step a2, calculating to obtain a mathematical average value of the thermal efficiency performance of any standard gas equipment according to the obtained W thermal efficiency performance values of any standard gas equipment; wherein the arithmetic mean value of the thermal efficiency performance of any standard gas equipment is marked as
A3, obtaining the standard deviation of the thermal efficiency performance test of any standard gas equipment according to the obtained thermal efficiency performance value and the arithmetic mean value of the thermal efficiency performance of any standard gas equipment; wherein the standard deviation of the thermal efficiency performance test of any standard gas equipment is marked as sigmaη：
Step a4, using the standard deviation of the obtained thermal efficiency performance test of any standard gas equipment as the uncertainty of any standard gas equipmentClass a rating of degrees; wherein, the Equipment of any standard gas EquipmentiIs marked as a class A rating of uncertainty
Step 2, obtaining A-class evaluation values and B-class evaluation values of uncertainty of each accessory part associated with the thermal efficiency performance of each standard gas equipment;
wherein, a standard gas Equipment is setiThermal efficiency performance and MiAn accessory unit is associated, MiThe jth Accessory component in the Accessory component association is marked as Accessi,jAccessory component Accessi,jClass A rating of uncertainty flag
Accessory accessi,jClass B rating of uncertainty flag
The accessory parts in the gas appliance measuring system are any combination of a thermometer, a barometer, a gas flowmeter, a pressure gauge and a timer;
step 3, obtaining the uncertainty of the synthetic standard of each accessory part according to the A-class evaluation value and the B-class evaluation value of the uncertainty corresponding to each accessory part; wherein, the Accessory part is Accessi,jThe synthetic standard uncertainty marker of
In the actual testing process, the class a evaluation value and the class B evaluation value of the uncertainty of any accessory component in the gas appliance measuring system are provided by a provider corresponding to the accessory component, that is, the provider of the accessory component provides the class a evaluation value and the class B evaluation value of the uncertainty of the accessory component while providing the accessory components, and a measurer of the uncertainty of the gas appliance to be measured cannot determine the class a evaluation value and the class B evaluation value of the uncertainty of each accessory component by himself;
of course, in order to more accurately obtain the class B evaluation value of the uncertainty of each accessory corresponding to each standard gas-fired device, so as to improve the uncertainty calculation accuracy of each subsequently obtained standard gas-fired device, in this embodiment, the class B evaluation value of the uncertainty of any accessory may also be calculated in the following manner from step B1 to step B4; specifically, the method comprises the following steps:
b1, repeating U times of independent performance measurement work on the same performance index aiming at any accessory component under the same performance test condition to obtain a U individual performance index measured value of any accessory component; wherein the U-th performance index measurement value in the U-th performance index measurement values is marked as zetauU is more than or equal to 1 and less than or equal to U; the performance index of the accessory component is related to the thermal efficiency performance of the corresponding standard gas appliance;
b2, calculating the performance index measurement arithmetic mean value of any accessory part according to the obtained U performance index measurement value of any accessory part; wherein the performance index measurement arithmetic mean of any accessory part is marked as
B3, obtaining the standard deviation of any accessory part according to the performance index measured value and the performance index measurement arithmetic mean value; wherein the standard deviation of the performance index measurement of any of the accessory components is labeled as σζ：
Step b4, using the measured standard deviation of the performance index of any accessory part as the A-type evaluation value of the uncertainty of any accessory part; wherein any one of the Accessory parts is Accessi,jIs marked as a class A rating of uncertainty
It should be noted that in this embodiment, the calculation of the uncertainty of each standard gas appliance in the gas appliance measurement system combines the uncertainty of each accessory component that affects the performance of the standard gas appliance, so as to construct and form a relationship between the uncertainty of the standard gas appliance and the uncertainty of each accessory component that can be observed quantitatively, which is convenient for an experimenter to correct and adjust the relevant parameters of the corresponding accessory component according to the condition of each test station, reduce the uncertainty of each accessory component, achieve the purpose of reducing the uncertainty of the standard gas appliance and reducing the uncertainty of the whole gas appliance measurement system, finally make each adjusted accessory component meet the requirement of the uncertain test regulation of the subsequent gas appliance to be tested and the accuracy of the test station, avoid unnecessary repeated verification by the testers, and provide the test efficiency;
step 4, correspondingly obtaining a B-type evaluation value of the uncertainty of each standard gas device according to the known sensitivity coefficient of each accessory part and the obtained synthetic standard uncertainty of each accessory part; wherein, the Accessory part is Accessi,jIs marked as
Equipment of standard gas EquipmentiIs marked as a class B rating for uncertainty
Step 5, respectively obtaining the combined standard uncertainty of each standard gas appliance according to the A-class evaluation value and the B-class evaluation value of the uncertainty of each standard gas appliance in the gas appliance measuring system; wherein, standard gas EquipmentiThe synthetic standard uncertainty marker of
Step 6, obtaining the uncertainty of the gas appliance measuring system according to the synthesis standard uncertainty of each standard gas device in the obtained gas appliance measuring system; wherein the uncertainty mark of the gas appliance measurement system is uSystem：
Step 7, after the gas equipment to be tested is placed on a station to be tested in the gas appliance measuring system, acquiring the actual heat efficiency value of the gas equipment to be tested; the gas Equipment to be tested is marked as Equipment', and the actual thermal efficiency value of the gas Equipment to be tested is marked as etaPractice of(ii) a The gas equipment to be measured and the standard gas equipment in the gas appliance measuring system in the embodiment refer to two different pieces of equipment; after the uncertainty of the gas appliance measuring system is obtained by executing the steps 1 to 6, the step 7 is carried out;
step 8, according to the uncertainty of the obtained gas appliance measuring system, the expected value of the heat efficiency of the gas equipment to be measured and the reality of the gas equipment to be measuredObtaining a confidence factor for searching a standard normal distribution function table according to the interpersonal thermal efficiency value; wherein the expected value of the thermal efficiency of the gas equipment to be tested is marked as etaExpectation ofThe confidence factor is marked as k:
step 9, searching and acquiring a probability distribution function value corresponding to the confidence factor in a standard normal distribution function table, taking the searched probability distribution function value as an unqualified probability for representing the thermal efficiency performance of the to-be-tested gas equipment, calculating to obtain a qualified probability of the thermal efficiency performance of the to-be-tested gas equipment, and taking the obtained unqualified probability as an uncertainty value of a to-be-tested station where the to-be-tested gas equipment is placed; the probability distribution function value corresponding to the confidence factor k is marked as phi (x), and the qualified probability of the thermal efficiency performance of the gas equipment to be tested is marked as pQualifiedAnd the uncertainty value of the station to be tested placed on the gas equipment to be tested is marked as uStation to be tested：
pQualified＝1-Φ(x)，uStation to be tested＝Φ(x)。
The finding of the probability distribution function value Φ (x) corresponding to the confidence factor k in the standard normal distribution function table belongs to the prior art, and is not described herein again. The uncertainty value of the test station position where the gas appliance to be tested is placed is obtained by searching the standard normal distribution function table through the confidence factor, the operation is repeated, after the uncertainty of each test station position in the gas appliance measurement system is measured, and then through comparison, which test station position in the gas appliance measurement system is relatively more accurate can be judged, namely, the smaller the uncertainty value of the test station position is, the more accurate the test station position is, and the analysis and correction of the test station position with high uncertainty or abnormal condition are facilitated.
The embodiment also provides a thermal efficiency measuring method of the gas equipment, and the uncertainty measuring method in the embodiment is firstly applied to measure and obtain the test platform with the minimum uncertainty. Specifically, the thermal efficiency measuring method of the gas-fired equipment comprises the following steps C1-C4:
step C1, placing the gas equipment needing to determine the thermal efficiency on a test bench with minimum uncertainty in the gas appliance measuring system, and starting the gas equipment and the gas appliance measuring system;
step C2, acquiring a water inlet temperature value and a water outlet temperature value corresponding to the gas equipment; wherein the inlet water temperature value is marked as t1The outlet water temperature value is marked as t2；
Step C3, acquiring the hot water outlet amount, the actually measured gas low heat value and the actually measured gas flow corresponding to the gas equipment; wherein, the hot water output quantity is marked as M, and the actually measured gas low heat value is marked as Q1And the measured gas flow is marked as VConsumption unit；
Step C4, setting a gas flow correction coefficient, and obtaining the heat efficiency of the gas equipment according to the water inlet temperature value, the water outlet temperature value, the hot water outlet amount, the actually measured gas low heat value, the actually measured gas flow and the gas flow correction coefficient; wherein the gas flow correction coefficient is marked as f1The thermal efficiency of the gas plant is marked as η:
When testing the thermal efficiency performance of the gas equipment, the gas equipment to be tested is placed on a test bench with smaller uncertainty, so that the accuracy of the thermal efficiency performance test of the gas equipment is improved. That is to say, through the uncertain condition of arbitrary test station position in survey gas utensil measurement system, can help the experimenter to learn the degree of reliability of each test station position, from this in the gas equipment thermal efficiency survey to this embodiment, the experimenter can place the gas equipment that needs the test on the test station position that has less uncertainty (can be reliable the degree higher) to ensure the accuracy of gas equipment thermal efficiency performance that measures.
Claims (6)
1. The method for measuring the uncertainty of the test station position of the gas equipment is characterized by comprising the following steps 1-9:
step 1, testing and obtaining an A-type evaluation value of uncertainty of each standard gas device in a gas appliance measurement system in advance; the number of standard gas Equipment in the gas appliance measuring system is set to be N, and the ith standard gas Equipment in the gas appliance measuring system is marked as EquipmentiI is more than or equal to 1 and less than or equal to N; equipment of standard gas EquipmentiIs marked as a class A rating of uncertainty
Step 2, obtaining A-class evaluation values and B-class evaluation values of uncertainty of each accessory part associated with the thermal efficiency performance of each standard gas equipment;
wherein the standard gas appliance Equipment is setiThermal efficiency performance and MiAn accessory unit is associated, MiThe jth Accessory component in the Accessory component association is marked as Accessi,jSaid Accessory part Accessi,jClass A rating of uncertainty flag
The Accessory part Accessi,jClass B rating of uncertainty flag
1≤j≤Mi；
Step 3, obtaining the uncertainty of the synthetic standard of each accessory part according to the A-class evaluation value and the B-class evaluation value of the uncertainty corresponding to each accessory part; wherein, the Accessory part is Accessi,jThe synthetic standard uncertainty marker of
Step 4, correspondingly obtaining a B-type evaluation value of the uncertainty of each standard gas equipment according to the known sensitivity coefficient of each accessory part and the obtained synthetic standard uncertainty of each accessory part; wherein the accessory part
Is marked as
The standard gas EquipmentiIs marked as a class B rating for uncertainty
Step 5, respectively obtaining the combined standard uncertainty of each standard gas appliance according to the A-class evaluation value and the B-class evaluation value of the uncertainty of each standard gas appliance in the gas appliance measuring system; wherein, the standard gas EquipmentiThe synthetic standard uncertainty marker of
Step 6, obtaining the uncertainty of the gas appliance measuring system according to the synthesis standard uncertainty of each standard gas device in the obtained gas appliance measuring system; wherein the uncertainty flag of the gas appliance measurement system is uSystem：
Step 7, after the gas equipment to be tested is placed on a station to be tested in the gas appliance measuring system, acquiring the actual thermal efficiency value of the gas equipment to be tested; the gas Equipment to be tested is marked as Equipment', and the actual thermal efficiency value of the gas Equipment to be tested is marked as etaPractice of；
Step 8, obtaining a confidence factor for searching a standard normal distribution function table according to the uncertainty of the obtained gas appliance measuring system, the expected heat efficiency value aiming at the gas equipment to be tested and the actual heat efficiency value of the gas equipment to be tested; wherein the expected value of the thermal efficiency of the gas equipment to be tested is marked as etaExpectation ofThe confidence factor is marked as k:
step 9, searching and acquiring a probability distribution function value corresponding to the confidence factor in a standard normal distribution function table, taking the searched probability distribution function value as an unqualified probability for representing the thermal efficiency performance of the to-be-tested gas equipment, calculating to obtain a qualified probability of the thermal efficiency performance of the to-be-tested gas equipment, and taking the unqualified probability as an uncertainty value of a to-be-tested station where the to-be-tested gas equipment is placed; the probability distribution function value corresponding to the confidence factor k is marked as phi (x), and the qualified probability of the thermal efficiency performance of the gas equipment to be tested is marked as pQualifiedAnd the uncertainty value of the station to be tested placed on the gas equipment to be tested is marked as uStation to be tested：
pQualified＝1-Φ(x)，uStation to be tested＝Φ(x)。
2. The method for determining uncertainty of test stand position of gas-fired equipment according to claim 1, wherein in step 1, the process of obtaining the class a rating of uncertainty of any standard gas-fired equipment in the gas-fired appliance measurement system comprises the following steps a 1-a 4:
step a1, repeatedly executing W times of independent thermal efficiency performance measurement work under the same test conditions aiming at any standard gas equipment to obtain W thermal efficiency performance values of any standard gas equipment; wherein the W-th thermal efficiency performance value of the W thermal efficiency performance values is labeled as etaw，1≤w≤W；
Step a2, calculating to obtain a mathematical average value of the thermal efficiency performance of any standard gas equipment according to the obtained W thermal efficiency performance values of any standard gas equipment; wherein the heat efficiency performance arithmetic mean value of any standard gas equipment is marked as
A3, obtaining the standard deviation of the thermal efficiency performance test of any standard gas equipment according to the obtained thermal efficiency performance value and the arithmetic mean value of the thermal efficiency performance of any standard gas equipment; wherein the standard deviation of the thermal efficiency performance test of any standard gas equipment is marked as sigmaη：
A4, taking the standard deviation of the thermal efficiency performance test of any standard gas equipment as the A-type evaluation value of the uncertainty of any standard gas equipment; wherein, any standard gas EquipmentiIs marked as a class A rating of uncertainty
3. The method for determining uncertainty of a test stand for a gas appliance according to claim 2, wherein in step 3, the class a rating and the class B rating of the uncertainty of any accessory in the gas appliance measurement system are provided by the provider of the corresponding accessory.
4. The method for determining uncertainty of a test stand of a gas appliance according to claim 2, wherein in step 3, the class a rating of uncertainty of any accessory in the gas appliance measurement system is provided by a provider of the corresponding accessory, and the class B rating of uncertainty of any accessory in the gas appliance measurement system is calculated according to the following steps B1-B4:
b1, repeating U times of independent performance measurement work on the same performance index aiming at any accessory component under the same performance test condition to obtain a U individual performance index measured value of any accessory component; wherein the U-th performance index measurement value in the U-th performance index measurement values is marked as zetauU is more than or equal to 1 and less than or equal to U; the performance index of the accessory component is related to the thermal efficiency performance of the corresponding standard gas equipment;
b2, calculating the performance index measurement arithmetic mean value of any accessory part according to the obtained U performance index measurement value of any accessory part; wherein the performance index measurement arithmetic mean of any accessory component is marked as
B3, obtaining the standard deviation of any accessory part according to the performance index measured value and the performance index measurement arithmetic mean value; wherein the standard deviation of the performance measure of any of the accessory components is denoted as σζ：
Step b4, using the measured standard deviation of the performance index of any accessory part as the A-type evaluation value of the uncertainty of any accessory part; wherein any one of the Accessory parts is an Accessi,jIs marked as a class A rating of uncertainty
5. The method for measuring uncertainty of a test position of a gas appliance according to any one of claims 1 to 4, wherein the accessory component in the gas appliance measurement system is any combination of a thermometer, a barometer, a gas flow meter, a pressure gauge and a timer.
6. A method for measuring thermal efficiency of a gas plant, which comprises the steps of (A) measuring the uncertainty of a test stand having the smallest uncertainty by the uncertainty measuring method according to claim 4, wherein the method comprises the steps of C1 to C4:
step C1, placing the gas equipment needing to determine the thermal efficiency on a test bench with minimum uncertainty in the gas appliance measuring system, and starting the gas equipment and the gas appliance measuring system;
step C2, acquiring a water inlet temperature value and a water outlet temperature value corresponding to the gas equipment; wherein, theThe inlet water temperature value is marked as t1The outlet water temperature value is marked as t2；
Step C3, acquiring the hot water outlet amount, the actually measured gas low heat value and the actually measured gas flow corresponding to the gas equipment; wherein the hot water outlet quantity is marked as M, and the actually measured gas low heating value is marked as Q1And the measured gas flow mark is VConsumption unit；
Step C4, setting a gas flow correction coefficient, and obtaining the heat efficiency of the gas equipment according to the water inlet temperature value, the water outlet temperature value, the hot water outlet amount, the actually measured gas low heat value, the actually measured gas flow and the gas flow correction coefficient; wherein the gas flow correction coefficient is marked as f1The thermal efficiency of the gas-fired plant is marked as η:
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Denomination of invention: Test bench uncertainty measurement method and thermal efficiency measurement method for gas equipment Effective date of registration: 20231102 Granted publication date: 20210723 Pledgee: Bank of China Limited Ningbo Hangzhou Bay New Area sub branch Pledgor: NINGBO FOTILE KITCHEN WARE Co.,Ltd. Registration number: Y2023980063518 |
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