GB/T 43911-2024Evaluation method for uncertainty of boiler thermal performance test (English PDF)

1 Scope

This document describes the uncertainty assessment method for boiler thermal performance tests, including the source analysis of measurement uncertainty, measurement model

Establishment, assessment of standard uncertainty, assessment of expanded uncertainty and assessment report:

This document is applicable to the measurement uncertainty assessment of process parameters and measurement results in boiler thermal performance tests:

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document:

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to

This document:

GB/T 10180 Thermal performance test procedures for industrial boilers

GB/T 10184 Power plant boiler performance test procedures

GB/T 27418 Evaluation and expression of measurement uncertainty

JJF1059:1 Evaluation and Expression of Measurement Uncertainty

NB/T 47066 Test methods for thermal performance of condensing boilers

3 Terms and definitions

The following terms and definitions apply to this document:

3:1

Accuracy

The degree of agreement between the measured value of a measurand and its true value:

Note 1: The concept of "measurement accuracy" is not a quantity and does not give a numerical value: When a measurement provides a smaller measurement error, it is said that the measurement is more accurate:

Yes:

NOTE 2 The term “measurement accuracy” should not be confused with “measurement correctness” or “measurement precision”, although it is related to these two concepts:

Note 3 to entry: Measurement accuracy is sometimes understood as the degree of agreement between measured values assigned to the measurand:

[Source: JJF1001-2011, 5:8]

3:2

Trueness

The degree of agreement between the average of an infinite number of repeated measurements and a reference value:

Note 1: Measurement accuracy is not a quantity and cannot be expressed numerically:

Note 2: Measurement accuracy is related to systematic measurement errors and has nothing to do with random measurement errors:

Note 3: The term "measurement trueness" cannot be expressed as "measurement accuracy" and vice versa:

[Source: JJF1001-2011, 5:9] […]