1994-06-01

Humidity and Temperature Control in the ASTROCULTURE™ Flight Experiment 941282

The ASTROCULTURE™ (ASC) middeck flight experiment series was developed to test subsystems required to grow plants in reduced gravity, with the goal of developing a plant growth unit suitable for conducting quality biological research in microgravity. Previous Space Shuttle flights (STS-50 and STS-57) have successfully demonstrated the ability to control water movement through a particulate rooting matrix in microgravity and the ability of LED lighting systems to provide high levels of irradiance without excessive heat build-up in microgravity.
The humidity and temperature control system used in the middeck flight unit is described in this paper. The system controls air flow and provides dehumidification, humidification, and condensate recovery for a plant growth chamber volume of 1450 cm3. It provides the ASC flight units with a level of environmental control equivalent to most terrestrial plant growth chambers and has been shown to be capable of controlling humidity levels in the chamber to within 5% relative humidity over a range of 50% to 90% RH and air temperature levels in the chamber within 2°C. However, in this prototype unit, control is limited to the range of 24°C to 35°C. A prototype system was tested with no plants on STS-60, and a flight unit is currently scheduled to be tested on STS-63 in which the first experiments with plants will be conducted.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Advancements in Water Vapor Electrolysis Technology

881041

View Details

TECHNICAL PAPER

Space Life Support from the Cellular Perspective

2001-01-2229

View Details

TECHNICAL PAPER

Gas Composition Support Aids for Space Vehicle Compartments Based on CO2 Hydrogenation, H2O Electrolysis, CO2 Removal and Concentration

951542

View Details

X