室内二氧化碳测量分析工具

NIST Technical Note 2213 Indoor Carbon Dioxide Metric Analysis Tool Andrew Persily Brian J. Polidoro This publication is available free of charge from: https://doi.org/10.6028/NIST.TN.2213 NIST Technical Note 2213 Indoor Carbon Dioxide Metric Analysis Tool Andrew Persily Brian J. Polidoro Building Energy and Environment Division Engineering Laboratory This publication is available free of charge from: https://doi.org/10.6028/NIST.TN.2213 March 2022 U.S. Department of Commerce Gina M. Raimondo, Secretary National Institute of Standards and Technology James K. Olthoff, Performing the Non-Exclusive Functions and Duties of the Under Secretary of Commerce for Standards and Technology & Director, National Institute of Standards and Technology Certain commercial entities, equipment, or materials may be identified in this document in order to describe an experimental procedure or concept adequately. Such identification is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that the entities, materials, or equipment are necessarily the best available for the purpose. National Institute of Standards and Technology Technical Note 2213 Natl. Inst. Stand. Technol. Tech. Note 2213, 37 pages (March 2022) CODEN: NTNOEF This publication is available free of charge from: https://doi.org/10.6028/NIST.TN.2213 i Abstract Indoor carbon dioxide (CO2) concentrations have been used for decades to evaluate indoor air quality (IAQ) and ventilation and more recently have factored into discussions of the risk of airborne infectious disease transmission. However, many applications of indoor CO2 reflect a lack of understanding of the connection between indoor CO2 concentrations, ventilation and IAQ. In many cases, an indoor concentration of 1000 ppmv has been used as a metric of IAQ and ventilation without an understanding of its basis or significance. After many attempts to dissuade practitioners and researchers from using this or some other single concentration as a metric of ventilation and IAQ, an approach has been developed to determine a space-specific CO2 concentration that can be used as an indicator of the outdoor ventilation rate. The concept, as described in this report, is to estimate the CO2 concentration that would be expected in a specific space given its intended ventilation rate per person, the number of occupants and the rate at which they generate CO2. A calculation method is described to estimate the CO2 concentration in a space at selected times after occupancy starts, which provides a more meaningful ventilation metric than a single value for all spaces. An online tool (QICO2, Quick Indoor CO2) has been developed to perform these calculations, and this report contains a User Guide for that tool. Key Words: carbon dioxide; indoor air quality; metric; standards; ventilation. ______________________________________________________________________________________________________ This publication is available free of charge from: https://doi.org/10.6028/NIST.TN.2213 ii Disclaimer This tool was developed by employees of the National Institute of Standards and Technology (NIST), an agency of the Federal Government, and is being made available as a public service. Pursuant to title 17 United States Code section 105, works of NIST employees are not subject to copyright protection in the United States. This tool may be subject to foreign copyright. Permission in the United States and in foreign countries, to the extent that NIST may hold copyright, to use, copy, modify, create derivative works, and distribute this tool and its documentation without fee is hereby granted on a non-exclusive basis, provided that this notice and disclaimer of warranty appears in all copies. THE TOOL IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER EXPRESS, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY THAT THE TOOL WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE TOOL, OR ANY WARRANTY THAT THE TOOL WILL BE ERROR-FREE. IN NO EVENT SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM, OR IN ANY WAY CONNECTED WITH THIS TOOL, WHETHER OR NOT BASED UPON WARRANTY, CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT OF THE RESULTS OF, OR USE OF, THE TOOL PROVIDED HEREUNDER. Users are warned that this software is intended for use only by persons competent in the field of particle exposure analysis and is intended only to supplement the judgement of the qualified user. The computer programs described in this report are prototype method