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ASTM-E741:2000 Edition

ASTM-E741:2000 Edition

$44.96

E741-00 Standard Test Method for Determining Air Change in a Single Zone by Means of a Tracer Gas Dilution

Published By Publication Date Number of Pages
ASTM 2000 17
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1.1 This test method describes techniques using tracer gas dilution for determining a single zone’s air change with the outdoors, as induced by weather conditions and by mechanical ventilation. These techniques are: (1) concentration decay, (2) constant injection, and (3) constant concentration.

1.2 This test method is restricted to any single tracer gas. The associated data analysis assumes that one can characterize the tracer gas concentration within the zone with a single value. The zone shall be a building, vehicle, test cell, or any conforming enclosure.

1.3 Use of this test method requires a knowledge of the principles of gas analysis and instrumentation. Correct use of the formulas presented here requires consistent use of units, especially those of time.

1.4 Determination of the contribution to air change by individual components of the zone enclosure is beyond the scope of this test method.

1.5 The results from this test method pertain only to those conditions of weather and zonal operation that prevailed during the measurement. The use of the results from this test to predict air change under other conditions is beyond the scope of this test method.

1.6 The text of this test method references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered requirements of this test method.

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
2 Summary of Test Method
TABLE 1
3 Significance and Use
Apparatus
4 Hazards
Procedure for the Concentration Decay Test Method
FIG. 1
5 Procedure for the Constant Injection Test Method
TABLE 2
FIG. 2
6 FIG. 3
7 Procedure for the Constant Concentration Test Method
FIG. 4
8 Procedures for Preparing the Zone
Procedures for Distributing Tracer Gas
9 Procedures for Sampling Tracer Gas
10 Procedures for Gas Analysis
Procedures for Ancillary Measurements
11 Report
Precision and Bias
12 Keywords
A1. ANALYZER PRECISION AND BIAS
A1.1
A1.2
A1.3
A1.4
13 A1.5
X1. TRACER GASES USED TO DETERMINE AIR CHANGE
X1.1
TABLE X1.1
14 X2. CALIBRATION OF CERTAIN GAS ANALYZERS
X2.1
X2.2
X2.3
X2.4
X3. CONFIDENCE INTERVALS
X3.1
TABLE X1.2
15 X3.2
X3.3
X4. EXAMPLES OF ZONE PREPARATION PROTOCOLS
X4.1
X4.2
X4.3
X5. ZONE VOLUME MEASUREMENT WITH A TRACER GAS
X5.1
X5.2
16 X5.3
X6. PROPAGATION OF ERRORS ANALYSIS
X6.1
X6.2
X6.3
X6.4
17 X7. SAMPLING DURATION
X7.1
REFERENCES

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