Soil Plant Atmosphere Research Facility Controlled Environment Sunlit Plant Growth Chambers. Day-Lit Plant Growth Chambers.
A TOOL FOR PLANT RESEARCH AND MODELING
The SPAR units are located outdoors on a concrete pad. Each unit has the capability for controlling air temperatures, and atmospheric composition especially CO2 concentration at predetermined set points for studies of plant growth in natural solar radiation regimes. The bottom third of each SPAR unit consists of a steel bin to contain rooting medium. The upper two thirds is an airtight Plexiglas chamber
A door in the bottom of the aerial portion of each chamber is hinged for access to the soil surface and the aboveground portions of the plants. Ducts on the northern face connect to the cooling system. Conditioned air is introduced at the top of the Plexiglas chamber, flows down through the plant canopy, and is returned to ducts just above the soil surface. A steel soil lysimeter contains the rooting medium
The SPAR units provide a natural solar radiation environment (94% transmissive to photosynthetically active radiation) and have capabilities for controlling both the aerial and soil environment across a wide range of environmental set points. Controlled factors in each chamber include atmospheric carbon dioxide concentration ([C02]), dry-bulb air temperature, and dew point temperature. The environmental control system can be programmed to provide continuously
The airflow design directs air downward along the center aisle way. Air is then redirected returning upward between the plants and through the lamp canopies. Filtered and adjustable fresh air intake enables researchers to exchange air to the chamber in a controlled manner.
Cooling for the GR series is provided by a self-contained water-cooled condensing unit with hot gas bypass for continuous compressor operation. An electronic modulating valve provides tight temperature control while ensuring quiet operation. Pressure transducers are included for monitoring the status of the refrigeration system. Alternative refrigeration methods are available depending on site-specific and/or user defined requirements. Consult the factory for heat rejection information and other refrigeration options.
User programmable “set and forget” alarms track the chamber’s operation versus user-defined set points. This allows for exceptionally accurate monitoring without the need for adjustment every time the set point is redefined. Backup “high/ low” alarms provide a further level of protection while visual and audible notification is provided when any alarm is activated. Contacts for connection to a building management system are also included.