Abstract: A system for regulating the supply of conditioned gases to an environmentally controlled enclosure. A greenhouse or warehouse in which plants are grown are supplied with gases having a controlled absolute humidity, temperature, and carbon dioxide content. The properties of exhaust gas from the environmentally controlled enclosure are measured, and the mass of bone dry gas provided, the absolute humidity, temperature, and carbon dioxide content in the enclosure are maintained, and the transpiration rate of plants in the enclosure is measured by comparing properties of conditioned gas at the inlet with exhaust gas exhausted from the enclosure, in order to enhance transpiration of the plants in the enclosure, to allow the grower to maximize growth or other selected properties of the plants under cultivation.

Abstract: A system for regulating the supply of conditioned gases to an environmentally controlled enclosure. A greenhouse or warehouse in which plants are grown are supplied with gases having a controlled absolute humidity, temperature, and carbon dioxide content. The properties of exhaust gas from the environmentally controlled enclosure are measured, and the mass of bone dry gas provided, the absolute humidity, temperature, and carbon dioxide content in the enclosure are maintained, and the transpiration rate of plants in the enclosure is measured by comparing properties of conditioned gas at the inlet with exhaust gas exhausted from the enclosure, in order to enhance transpiration of the plants in the enclosure, to allow the grower to maximize growth or other selected properties of the plants under cultivation.

Abstract: A fluidized spray vessel. A vessel design is provided for recovering heat from gaseous heat streams. The vessel utilizes a semi-fluidized bed for obtaining desirable liquid/vapor contact times. A spray section is provided in which liquid is sprayed through nozzles designed to provide a mean droplet size having a terminal velocity of from about sixty percent to about ninety five percent of the superficial upward gas velocity. These spray tower design criteria enhance spray tower performance, and thus enables more efficient heat recovery to be practiced, particularly in systems where relatively low grade heat sources are encountered.

Abstract: A fluidized spray vessel. A vessel design is provided for recovering heat from gaseous heat streams. The vessel utilizes a semi-fluidized bed for obtaining desirable liquid/vapor contact times. A spray section is provided in which liquid is sprayed through nozzles designed to provide a mean droplet size having a terminal velocity of from about sixty percent to about ninety five percent of the superficial upward gas velocity. These spray tower design criteria enhance spray tower performance, and thus enables more efficient heat recovery to be practiced, particularly in systems where relatively low grade heat sources are encountered.

Abstract: A fluidized spray vessel. A vessel design is provided for recovering heat from gaseous heat streams. The vessel utilizes a semi-fluidized bed for obtaining desirable liquid/vapor contact times. A spray section is provided in which liquid is sprayed through nozzles designed to provide a mean droplet size having a terminal velocity of from about sixty percent to about ninety five percent of the superficial upward gas velocity. These spray tower design criteria enhance spray tower performance, and thus enables more efficient heat recovery to be practiced, particularly in systems where relatively low grade heat sources are encountered.

Abstract: A scrubber for removal of contaminants from gas by liquid contact. The scrubber has a gas and liquid tight containment walls, to contain a gas stream through the scrubber, and to allow recirculation of scrubbing liquid, without the need for external power. A plurality of preferably annular, downwardly extending underflow weirs arc provided to define therebetween a series of gas compartments. Preferably annular, upwardly extending overflow baffles are provided between adjacent underflow weirs, and liquid compartments are defined between the inner surface of an outer wall and the first overflow baffle, and between successive overflow baffles, if present. A charge of scrubbing liquid is provided, and gas is directed into the scrubber through an inlet nozzle, under the first underflow weir, over the first overflow baffle, and thence under the next underflow weir.