Controlling indoor CO2 with a solid sorbent: Kinetics and capacity

Elliott T. Gall, Victor W.C. Chang, William W. Nazaroff

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

1 Citation (Scopus)

Abstract

Absent unvented combustion, in occupied indoor spaces, CO2 concentrations depend primarily on three factors: Outdoor CO2 concentrations, CO2 emission rates from human metabolism, and the outdoor-air ventilation rate. Indoor CO2 levels are generally managed by means of dilution with outdoor air. In this work, we investigate an alternative approach to controlling indoor CO2: Active removal using a solid sorbent. We report parameterizations of chemical kinetics and uptake capacity to soda-lime sorbent across a range of conditions relevant to indoor environments. Reaction rate constants for the interaction of Ca(OH) 2 present in soda-lime and CO2 range from 1.8×10-2 to 1.5×10-1 m2 mol-1 s-1, increasing with higher relative humidity (RH). Uptake capacities range from 0.04 to 0.36 g CO2/g sorbent, also increasing with higher RH. These data facilitate assessment of the technical feasibility of soda-lime scrubbers in buildings as an option for controlling indoor CO2.

Original languageEnglish
Title of host publicationProceedings of the Healthy Buildings 2015: America Conference - Innovation in a Time of Energy Uncertainty and Climate Adaptation
Pages474-477
Number of pages4
Publication statusPublished - 2015
Externally publishedYes
EventHealthy Buildings 2015: America Conference - Innovation in a Time of Energy Uncertainty and Climate Adaptation - Boulder, United States of America
Duration: 19 Jul 201522 Jul 2015

Conference

ConferenceHealthy Buildings 2015
Abbreviated titleHB 2015
CountryUnited States of America
CityBoulder
Period19/07/1522/07/15

Keywords

  • Air cleaning
  • Carbon capture
  • Climate change and indoor air

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