. A continuous stirred tank reactor (CSTR) system for exposing plants to gaseous air contaminants : principles, specifications, construction, and operation. Air, Pollution, United States; Plants, Effect of air pollution on; Plants, Effect of gases on. Figure 4.—The nine-chamber greenhouse CSTR system with supplemental lights (six chambers shown). General construction The nine-chamber CSTR system (fig. 5) in the greenhouse utilizes a single air-handling de- sign. The four-chamber CSTR system (fig. 7) in the Phytotron uses a common exhaust manifold with one air inlet for two chambers. Constructi
. A continuous stirred tank reactor (CSTR) system for exposing plants to gaseous air contaminants : principles, specifications, construction, and operation. Air, Pollution, United States; Plants, Effect of air pollution on; Plants, Effect of gases on. Figure 4.—The nine-chamber greenhouse CSTR system with supplemental lights (six chambers shown). General construction The nine-chamber CSTR system (fig. 5) in the greenhouse utilizes a single air-handling de- sign. The four-chamber CSTR system (fig. 7) in the Phytotron uses a common exhaust manifold with one air inlet for two chambers. Construction details for the two chamber systems and flow characteristics and performance data are similar. Ideal CSTR dimension ratios of diameter to height are 1 to 1, but 1 to is within acceptable limits. The greenhouse chambers are 42 by 48 in (1 to ), and the Phytotron chambers are 32 by 54 in (1 to ). The Phytotron chambers are slightly outside the technically acceptable limits for a CSTR but were designed to meet plant size and space constraints. Because of their unique features and their use in precision work, the Phytotron chambers (fig. 8) are discussed in de- tail below. The greenhouse chambers are similar in basic design (fig. 9). The chamber frame (fig. 8) is constructed of three angle-iron uprights held together by top and bottom circular hot-rolled steel strips. Cen- ter strips butt to either side of the centered angle-iron framed door that was designed to af- fect minimally the circular nature of the cham- ber. The frame is mounted on a %-in-plywood base. The door is attached by two butt hinges and secured with two metal latches to provide rapid access to the chamber. An inlet-duct sup- port plate was installed in the upper-rear position at the level of the impeller, and an exhaust open- ing was made in the floor near the door. A metal plate installed centrally on the metal top sup- ports holds the impeller assembly. The CSTR concept calls for three vertical
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