ASTM D6245-2007 Standard Guide for Using Indoor Carbon Dioxide Concentrations to Evaluate Indoor Air Quality and Ventilation《用室内二氧化碳浓度评估室内空气质量和通风的标准指南》.pdf
《ASTM D6245-2007 Standard Guide for Using Indoor Carbon Dioxide Concentrations to Evaluate Indoor Air Quality and Ventilation《用室内二氧化碳浓度评估室内空气质量和通风的标准指南》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6245-2007 Standard Guide for Using Indoor Carbon Dioxide Concentrations to Evaluate Indoor Air Quality and Ventilation《用室内二氧化碳浓度评估室内空气质量和通风的标准指南》.pdf(10页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 6245 07Standard Guide forUsing Indoor Carbon Dioxide Concentrations to EvaluateIndoor Air Quality and Ventilation1This standard is issued under the fixed designation D 6245; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revi
2、sion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This guide describes how measured values of indoorcarbon dioxide (CO2) concentrations can be used i
3、n evalua-tions of indoor air quality and building ventilation.1.2 This guide describes the determination of CO2genera-tion rates from people as a function of body size and level ofphysical activity.1.3 This guide describes the experimentally-determined re-lationship between CO2concentrations and the
4、 acceptability ofa space in terms of human body odor.1.4 This guide describes the following uses of indoor CO2concentrations to evaluate building ventilationmass balanceanalysis to determine the percent outdoor air intake at an airhandler, the tracer gas decay technique to estimate wholebuilding air
5、 change rates, and the constant injection tracer gastechnique at equilibrium to estimate whole building air changerates.1.5 This guide discusses the use of continuous monitoringof indoor and outdoor CO2concentrations as a means ofevaluating building ventilation and indoor air quality.1.6 This guide
6、discusses some concentration measurementissues, but it does not include or recommend a method formeasuring CO2concentrations.1.7 This guide does not address the use of indoor CO2tocontrol outdoor air intake rates.1.8 This standard does not purport to address all of thesafety concerns, if any, associ
7、ated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 1356 Terminology Relating to Sampling and Analysis ofAtmo
8、spheresD 3249 Practice for General Ambient Air Analyzer Proce-duresE 741 Test Method for Determining Air Change in a SingleZone by Means of a Tracer Gas Dilution2.2 Other Documents:ASHRAE Standard 62.1 Ventilation for Acceptable IndoorAir Quality33. Terminology3.1 DefinitionsFor definitions and term
9、s used in thisguide, refer to Terminology D 1356.3.2 Definitions of Terms Specific to This Standard:3.2.1 air change rate, nthe total volume of air passingthrough a zone to and from the outdoors per unit time, dividedby the volume of the zone (s1,h1).43.2.2 bioeffluents, ngases emitted by people as
10、a productof their metabolism that can result in unpleasant odors.3.2.3 single-zone, nan indoor space, or group of spaces,wherein the CO2concentration is uniform and that onlyexchanges air with the outdoors.4. Summary of Guide4.1 When investigating indoor air quality and buildingventilation, a number
11、 of tools are available. One such tool isthe measurement and interpretation of indoor and outdoor CO2concentrations. Using CO2concentrations to evaluate buildingindoor air quality and ventilation requires the proper use of theprocedures involved, as well as consideration of several factorsrelated to
12、 building and ventilation system configuration, occu-pancy patterns, non-occupant CO2sources, time and locationof air sampling, and instrumentation for concentration mea-surement. This guide discusses ways in which CO2concentra-tions can be used to evaluate building indoor air quality andventilation
13、.4.2 Section 6 discusses the rate at which people generateCO2and the factors that affect this rate.4.3 Section 7 discusses the use of indoor concentrations ofCO2as an indicator of the acceptability of a space in terms ofperceptions of human body odor.1This guide is under the jurisdiction of ASTM Com
14、mittee D22 on Air Qualityand is the direct responsibility of Subcommittee D22.05 on Indoor Air.Current edition approved Oct. 1, 2007. Published November 2007. Originallyapproved in 1998. Last previous edition approved in 2002 as D 6245 - 98(2002).2For referenced ASTM standards, visit the ASTM websit
15、e, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1791 Tullie Circ
16、le, NE, Atlanta, GA 30329.4A common way of expressing air change rate units is h-1= air changes per hour.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.4 Section 8 describes the use of mass balance analysis todetermine the percent
17、 outdoor air intake at an air handler basedon the measured CO2concentrations in the supply, return, andoutdoor air intake airstreams.4.5 Section 9 describes the use of the tracer gas decaytechnique to determine building air change rates usingoccupant-generated CO2as a tracer gas. The tracer gas deca
18、ytechnique is described in detail in Test Method E 741, and thissection discusses the application of this test method to thespecial case of occupant-generated CO2after the occupantshave left the building.4.6 Section 10 describes the use of the constant injectiontracer gas technique with occupant-gen
19、erated CO2to estimateoutdoor air ventilation rates. This technique is sometimesreferred to as equilibrium analysis, and Section 10 discussesthe use of this technique and the assumptions upon which it isbased.4.7 Section 11 discusses the use of continuous monitoring ofCO2concentrations as a means of
20、evaluating indoor air qualityand ventilation in buildings. In this discussion, continuousrefers to real-time concentration measurement recorded with adatalogging device, generally over several days.4.8 Section 12 discusses CO2concentration measurementissues, including measuring outdoor concentration
21、s, samplelocations for indoor concentration measurements, establishingthe uncertainty of measured concentrations, and calibration.5. Significance and Use5.1 Indoor CO2concentrations have been described andused by some people as an indicator of indoor air quality. Theseuses have included both appropr
22、iate and inappropriate inter-pretations of indoor CO2concentrations. Appropriate usesinclude estimating expected levels of occupant comfort interms of human body odor, studying occupancy patterns,investigating the levels of contaminants that are related tooccupant activity, and screening for the suf
23、ficiency of ventila-tion rates relative to occupancy. Inappropriate uses include theapplication of simple relationships to determine outdoor airventilation rates per person from indoor CO2concentrationswithout verifying the assumptions upon which these relation-ships are based, and the interpretatio
24、n of indoor CO2concen-trations as a comprehensive indicator of indoor air quality.5.2 Outdoor air ventilation rates affect contaminant levels inbuildings and building occupants perception of the acceptabil-ity of the indoor environment. Minimum rates of outdoor airventilation are specified in buildi
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