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Controlling indoor CO2 with a solid sorbent: Kinetics and capacity

  • Author(s): Gall, ET
  • Chang, VWC
  • Nazaroff, WW
  • et al.
Abstract

Absent unvented combustion, in occupied indoor spaces, CO concentrations depend primarily on three factors: Outdoor CO concentrations, CO emission rates from human metabolism, and the outdoor-air ventilation rate. Indoor CO levels are generally managed by means of dilution with outdoor air. In this work, we investigate an alternative approach to controlling indoor CO : 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) present in soda-lime and CO range from 1.8×10 to 1.5×10 m2 mol s , increasing with higher relative humidity (RH). Uptake capacities range from 0.04 to 0.36 g CO /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 CO . 2 2 2 2 2 2 2 2 2 -2 -1 -1 -1

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