title: Initial closed operation of the CELSS Test Facility Engineering Development Unit.
abstract: As part of the NASA Advanced Life Support Flight Program, a Controlled Ecological Life Support System (CELSS) Test Facility Engineering Development Unit has been constructed and is undergoing initial operational testing at NASA Ames Research Center. The Engineering Development Unit (EDU) is a tightly closed, stringently controlled, ground-based testbed which provides a broad range of environmental conditions under which a variety of CELSS higher plant crops can be grown. Although the EDU was developed primarily to provide near-term engineering data and a realistic determination of the subsystem and system requirements necessary for the fabrication of a comparable flight unit, the EDU has also provided a means to evaluate plant crop productivity and physiology under controlled conditions. This paper describes the initial closed operational testing of the EDU, with emphasis on the hardware performance capabilities. Measured performance data during a 28-day closed operation period are compared with the specified functional requirements, and an example of inferring crop growth parameters from the test data is presented. Plans for future science and technology testing are also discussed.
authors.affiliation: NASA Ames Research Center, Moffett Field, CA, 94035, USA.
authors.forename: M
authors.initials: M
authors.lastname: Kliss
authors.forename: C
authors.initials: C
authors.lastname: Blackwell
authors.forename: A
authors.initials: A
authors.lastname: Zografos
authors.forename: M
authors.initials: M
authors.lastname: Drews
authors.forename: R
authors.initials: R
authors.lastname: MacElroy
authors.forename: R
authors.initials: R
authors.lastname: McKenna
authors.forename: A G
authors.initials: AG
authors.lastname: Heyenga
mesh_terms: D000389:Air Conditioning / Q000379:methods*; D018533:Biomass; D002245:Carbon Dioxide / Q000378:metabolism; D018504:Ecological Systems, Closed; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D005160:Facility Design and Construction; D006813:Humidity; D018545:Lactuca / Q000254:growth & development* / Q000378:metabolism*; D008021:Life Support Systems / Q000295:instrumentation*; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D010945:Plants, Edible / Q000254:growth & development / Q000378:metabolism; D013696:Temperature
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen