Characteristics
The surface of the new part is 3124m² (3058m² of glasshouses and corridors, and 66m² for a packaging area). The other compartments, built in 2002 and 2007 are directly connected to the new glasshouse. It is divided into three compartments of 786m² each (43,70m*18m). A specialty of the glasshouse is the presence of a climate corridor at the southern side of the glasshouse, on the 3 compartments. Two wide corridors (4m) create a climatic buffer on the east and west side of the greenhouse. The whole structure is painted white with a height of 7.30 m.
There are eleven gutters/compartments, with an effective width of 1.80m between gutters to ease the air ducts positioning. It is necessary with this dispositive to tighten the plants on the ridge to maintain the wished for density. The roof is made of a traditional Security Glass with more than 90% light transmission. Each compartment is equipped with a heating system in rails and 2 tubes of 35 mm are positioned in the crop canopy, additionally to the heat exchangers (five for each compartment) installed in the climatic corridor for two of the compartments, and the system AVS (Active Ventilation Systems) for the 3rd. The 3 compartments are equipped with double screens, enabling to reduce the energy consumption and shading the crop during summer.
Objectives
Objectives are to test glasshouse types and equipment which could be adapted to local climatic conditions and to look for better energy efficiency for a tomato production.
A first compartment (GH4) is a semi-closed greenhouse type. This compartment benefits from equipment in the corridor to heat, dehumidify or cool the air: a guillotine opening controlling the outside air inlet, recycling opening to the greenhouse, overpressure opening on the roof, heat exchangers in the corridor, PAD cooling (alveolar structure in cellulose with water circulation). This compartment will also be equipped with a hybrid lighting (high-pressure sodium lamps and interLED) between the crop lines, with the objective of recycling the heat surplus emitted by high-pressure sodium lamps through the climate corridor.
A second compartment (GH5) will also work in semi-closed model, but with limited equipment. The renewing capacity is 7 air changes/hour. This compartment will not be equipped with a PAD but a fog located in the corridor will cool the outside air if needed.
The last compartment (GH6) will work with a traditional aeration with an objective of dehumidification only and a renewing capacity limited to 1.8 air renew/hour.
The supplier of this project, Hortined, proposes the concept of semi-closed GH modul’Air. This greenhouse will be complementary in its conception and equipment to the one installed at CTIFL in Carquefou.
Use for Fertinnowa project
Objectives
Objectives are to test glasshouse types and equipment which could be adapted to local climatic conditions and to look for better energy efficiency for a tomato production.
A first compartment (GH4) is a semi-closed greenhouse type. This compartment benefits from equipment in the corridor to heat, dehumidify or cool the air: a guillotine opening controlling the outside air inlet, recycling opening to the greenhouse, overpressure opening on the roof, heat exchangers in the corridor, PAD cooling (alveolar structure in cellulose with water circulation). This compartment will also be equipped with a hybrid lighting (high-pressure sodium lamps and interLED) between the crop lines, with the objective of recycling the heat surplus emitted by high-pressure sodium lamps through the climate corridor.
A second compartment (GH5) will also work in semi-closed model, but with limited equipment. The renewing capacity is 7 air changes/hour. This compartment will not be equipped with a PAD but a fog located in the corridor will cool the outside air if needed.
The last compartment (GH6) will work with a traditional aeration with an objective of dehumidification only and a renewing capacity limited to 1.8 air renew/hour.
The supplier of this project, Hortined, proposes the concept of semi-closed GH modul’Air. This greenhouse will be complementary in its conception and equipment to the one installed at CTIFL in Carquefou.
Use for Fertinnowa project
The 3 new greenhouses are connected to a mid-pressure UV treatment unit (PRIVA Vialux M-Line) to treat the drainage before recycling, while the other greenhouses are connected to a biofilter. Moreover, the new greenhouses are equipped with tools to monitor irrigation: slab balances (PRIVA Groscale) with drain sensor included, wireless moisture sensors (Grodan Grosens), and also PRIVA TopCrop Monitor devices. CATE will carry out demonstration activities on these tools in the framework of Fertinnowa.
For more information:
www.station-cate.fr
www.fertinnowa.com