Controlling indoor CO2 with a solid sorbent: Kinetics and capacity

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

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 proceeding › Conference Paper › Other

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 language	English
Title of host publication	Proceedings of the Healthy Buildings 2015: America Conference - Innovation in a Time of Energy Uncertainty and Climate Adaptation
Pages	474-477
Number of pages	4
Publication status	Published - 2015
Externally published	Yes
Event	Healthy Buildings 2015: America Conference - Innovation in a Time of Energy Uncertainty and Climate Adaptation - Boulder, United States of America Duration: 19 Jul 2015 → 22 Jul 2015

Conference

Conference	Healthy Buildings 2015
Abbreviated title	HB 2015
Country	United States of America
City	Boulder
Period	19/07/15 → 22/07/15

Keywords

Air cleaning
Carbon capture
Climate change and indoor air

Access to Document

Link to publication in Scopus

Cite this

@inproceedings{0e33854c197049a09c6cdf0d0081d987,

title = "Controlling indoor CO2 with a solid sorbent: Kinetics and capacity",

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.",

keywords = "Air cleaning, Carbon capture, Climate change and indoor air",

author = "Gall, {Elliott T.} and Chang, {Victor W.C.} and Nazaroff, {William W.}",

year = "2015",

language = "English",

pages = "474--477",

booktitle = "Proceedings of the Healthy Buildings 2015: America Conference - Innovation in a Time of Energy Uncertainty and Climate Adaptation",

note = "Healthy Buildings 2015 : America Conference - Innovation in a Time of Energy Uncertainty and Climate Adaptation, HB 2015 ; Conference date: 19-07-2015 Through 22-07-2015",

}

Controlling indoor CO₂ with a solid sorbent : Kinetics and capacity. / Gall, Elliott T.; Chang, Victor W.C.; Nazaroff, William W.

Proceedings of the Healthy Buildings 2015: America Conference - Innovation in a Time of Energy Uncertainty and Climate Adaptation. 2015. p. 474-477.

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Other

TY - GEN

T1 - Controlling indoor CO2 with a solid sorbent

T2 - Healthy Buildings 2015

AU - Gall, Elliott T.

AU - Chang, Victor W.C.

AU - Nazaroff, William W.

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - Air cleaning

KW - Carbon capture

KW - Climate change and indoor air

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BT - Proceedings of the Healthy Buildings 2015: America Conference - Innovation in a Time of Energy Uncertainty and Climate Adaptation

Y2 - 19 July 2015 through 22 July 2015

ER -