Greenhouse comprised of a ridge beam extending some distance above its roof defining two elongated side zones at either side of the ridge beam. The ridge beam is comprised of one or more elongated hollow spaces and with one or more closable openings in both side zones. The openings fluidly connect the exterior of the greenhouse with its interior and may be closed at one side and opened at its other side depending on the direction of the wind.

An optical element is provided which comprises a plurality of fluorophores disposed in a medium. The fluorophores have a quantum yield greater than 50% and an absorption spectrum with a maximum intensity at wavelengths less than 400 nm, and emit a spectrum of light having a maximum intensity at wavelengths within the range of 400 nm to 1200 nm. The optical element is at least partially transparent over the visible region of the spectrum. The optical element is especially useful as a window or other optical component of a greenhouse structure.

Objects of the present invention are to provide a film for an agricultural greenhouse that can maintain a CO.sub.2 concentration necessary for the photosynthesis of plants even when ventilation is not performed and to provide an agricultural greenhouse using the film. The film for an agricultural greenhouse of the present invention is a cellulose film which contains a cellulose acylate resin and has an equilibrium moisture content of 4% to 8% at a temperature of 25 C., a relative humidity of 80% and a thickness of 60 to 200 m.

A greenhouse framework (22) is assembled out of a framework material (24) such as typical pipes and the like, and the outer periphery of the greenhouse framework (22) is covered by a sheet outer surface member (30) formed from a plastic sheet; a sheet inner surface member (32) is formed on the inner side of the greenhouse framework (22) in a manner of being spaced by intervals to a certain extent from the sheet outer surface member (30) by using a heat shield sheet such that all of a floor surface (32a), a wall surface (32b), and a ceiling surface (32c) are substantially in a sealed state; and an air conditioning device (40) is installed. Thus, a desirable thermal insulation property is achieved between the inside of the greenhouse and the outside of the greenhouse, and air conditioning can be implemented with high energy efficiency. In other words, a greenhouse for plant cultivation that has a simple configuration and can be air conditioned with high energy efficiency can be provided.

A structure for growing plants comprising a main support, vertical supports along the perimeter of the foundation, a perimeter frame connected to the vertical supports, cables connected to the main support, vertical supports and perimeter frame, and an inner and outer shell formed from transmissive panels supported by the cables.

A greenhouse is disclosed having a light-transmitting barrier and a floor surface. The barrier and floor surface are connected to define an enclosure within the greenhouse for plant cultivation. The barrier includes an inner layer delimiting the enclosure and an outer layer. The inner and outer layers are impermeable to air to substantially prevent air from entering the enclosure through the inner layer. The outer layer is spaced apart above the inner layer to define an air passage therebetween. The air passage is in fluid communication with at least one air inlet in a bottom portion of the outer layer and with an air outlet in a top portion of the outer layer. Air within the air passage flows passively from the at least one air inlet to the air outlet upon being heated.

The present disclosure relates to a greenhouse having an inflatable and thermal insulation system. The greenhouse includes a lateral frame, a vertical frame, a top cover, an inflatable and thermal insulation system and a plurality of rotary shafts. The vertical frame is arranged at left and right sides. The lateral frame is arranged above and supported by the vertical frame. The top cover is arranged above the lateral frame. The plurality of rotary shafts are provided at both ends of the lateral frame, and at a top end of the vertical frame. The inflatable and thermal insulation system includes an air compressor, a dust collector, a dehydrator, a dryer, a constant-pressure and air-releasing controller, and a thermal insulation quilt which are communicated with each other in this order through a pipeline. The thermal insulation quilt is provided in the lateral frame and the vertical frame. The greenhouse has a simple structure, reduces manufacture cost and maintenance cost. The greenhouse has an independent air chamber, which provides a stable air layer with less air convection and ensures thermal insulation property.

The disclosed invention is a greenhouse suitable for growing crops and edible pants which can be used for personal or commercial uses. The embodied invention includes supporting framework and for an inner and outer cover which allows for use in colder environments. A two cover-adjustable system allows the cover to expand as crops grow.

A greenhouse is disclosed having a light-transmitting barrier and a floor surface. The barrier and floor surface are connected to define an enclosure within the greenhouse for plant cultivation. The barrier includes an inner layer delimiting the enclosure and an outer layer. The inner and outer layers are impermeable to air to substantially prevent air from entering the enclosure through the inner layer. The outer layer is spaced apart above the inner layer to define an air passage therebetween. The air passage is in fluid communication with at least one air inlet in a bottom portion of the outer layer and with an air outlet in a top portion of the outer layer. Air within the air passage flows passively from the at least one air inlet to the air outlet upon being heated.

A structure for growing plants comprising a main support, vertical supports along the perimeter of the foundation, a perimeter frame connected to the vertical supports, cables connected to the main support, vertical supports and perimeter frame, and an inner and outer shell formed from transmissive panels supported by the cables.