CoD2 Controller for Plant Growth Chambers

Document Number: 981805

Date Published: July 1998

Author(s):
Jeffrey Dehart - Umpqua Research Company
James R. Akse - Umpqua Research Company
James E. Atwater - Umpqua Research Company

Abstract:
A new technology for controlling the partial pressure of CO\d2 (pCO\d2) in a plant growth chamber (PGC) has been demonstrated. CO\d2 is gathered from the source atmosphere across a membrane gas exchanger and stored in an alkanolamine solution. The CO\d2 loading of the alkanolamine reservoir is monitored using specific conductance and controlled by the exposure time and temperature. The PGC pCO\d2 is maintained using a second membrane exchanger through which the alkanolamine circulates, absorbing or releasing CO\d2 to maintain equilibrium. The equilibrium pCO\d2 is determined by the CO\d2 loading and the temperature. Constant PGC feed pCO\d2 levels of roughly 1000 ppm have been maintained using sources with pCO\d2 both above and below this value.

File Size: 115K
Product Status: In Stock

See other papers presented at International Conference On Environmental Systems, July 1998, Danvers, MA, USA, Session: Regenerative Life Support Systems and Processes

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