The invention relates to biaxially oriented, UV-stabilized polyester films incorporating silicon dioxide particles as light-scattering particles and a UV stabilizer; a process for producing the same and to use thereof in greenhouse blinds. The invention particularly relates to single- or multilayer polyester film with transparency from 70 to 92 %, where: the film includes at least 1.0% by weight to at most 2.5% by weight of SiO.sub.2, with the d.sub.50 value of these SiO.sub.2 particles ranging from 3 to 9 m, the SV value of the film is at least 700, the scattering factor SF of the film is at least 2 and not more than 8, the haze of the film is from 60 to 95%, and the clarity of the film is from 15 to 40%; and all of the external layers comprise at least 0.3 % by weight of an organic UV stabilizer.

The present invention relates to a non-arch-shaped rainproof water-collection greenhouse, characterized by: a matrix of upright galvanized steel pipe columns, with adjacent columns fixed by cables connected to their upper ends, forming cable grids. A square greenhouse film with support rods along its edges is installed onto these cable grids. A water-collecting funnel and collection bucket are mounted at the center of the square film. The weight of the collection bucket and rainwater causes the square film to sag into a conical shape. To prevent excessive sagging or tearing, sag-limiting ropes are attached from the top ends of the four steel pipe columns corresponding to the film's corners, supporting the film from below and suspending the funnel and bucket in midair, creating a smooth, controlled sag. This invention features a rational design, simple structure, and minimal steel usage.

Top furling automated retractable greenhouse cover is a retractable cover for a greenhouse that is mounted on top of the greenhouse. Top furling automated retractable greenhouse cover has: a spine clamp, a left furling cover assembly, a right furling cover assembly, a hinge pin assembly, and an electrical control box. Left and right furling assemblies each have a curtain or cover, a furling rod, a furling motor, and a support arm. Electrical control box sends electronic signals to cause left and right covers or curtains to furl above the greenhouse when retracted and to unfurl down to the ground when extended to cover the greenhouse. The top-mounted design allows efficient use of gravity to apply tension to the furled rolls.

A pressurized greenhouse and air conditioning system designed to optimize plant growth environments. The pressurized greenhouse includes a frame with a transparent covering membrane, vertical fans for maintaining uniform climate conditions, and a pressure control system to manage air intake and exhaust. To achieve precise temperature control, the air conditioning system employs evaporative cooling, air-water heat exchange, and a thermal battery heat exchanger. It circulates air using horizontal fans and utilizes stored thermal energy for heating and cooling modes. Heat rejection means, such as cooling towers or chillers, further enhance efficiency. This inventive system offers comprehensive climate control capabilities for optimal plant growth, making it an essential tool for greenhouse cultivation.

A process for conditioning the air within a greenhouse comprising transparent walls and a structure including one or more ridge beams as part of a roof of the greenhouse. The process comprises maintaining a pressure difference between an average pressure within the greenhouse and a pressure exterior to the greenhouse, taking in air from the exterior of the greenhouse and mixing this air with air taken from the interior of the greenhouse to obtain conditioned air, distributing the conditioned air via a forced flow to the interior of the greenhouse, and discharging a volume of air from the interior of the greenhouse via openings present in the one or more ridge beams such to maintain the pressure difference.

A multi-tier, foldable roof includes photovoltaic (PV) cells for transforming solar energy into electrical energy. The roof includes a climate layer configured to close an opening of a structure and also configured to control temperature and humidity of an interior of the structure, a PV screen having plural PV panels, each PV panel configured to include plural PV cells, and an outer layer configured to protect the PV screen from soiling. The climate layer, the PV screen and the outer layer are spaced apart from each other with a given distance (H), and each of the climate layer, the PV screen and the outer layer is configured to change from a retracted state to an expanded state.

A method of applying a foil on an inclined roof structure having a ridge beam, a gutter, a plurality of parallel roof bars interconnecting the beam and the gutter and a ventilation opening frame which surrounds an opening that is located between the beam, the gutter and two neighboring bars, comprises: supplying a window frame that fits inside the ventilation opening frame, introducing the window frame within and holding the window frame at a fixed position with respect to the ventilation opening frame, laying a foil onto the roof structure such that it extends at least from the beam to the gutter and covers at least the neighboring roof bars, fixing the foil to the window frame and the ventilation opening frame along respective circumferential edges thereof, cutting the foil between the window frame and the ventilation opening frame, hence forming the window frame including the foil.