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Venlo Greenhouse

The Bom Group designs and assembles different types of greenhouse. The Venlo greenhouse is the most-built type of greenhouse worldwide. It is made of glass, with a skeleton of galvanised steel and aluminium.
In the Netherlands the greenhouses are mainly of glass, of which there are two main types: the Venlo greenhouse and the wide-span. For a number of years, The Bom Group has been developing new types of greenhouse, such as the closed, semi-closed and energy greenhouses. These greenhouses are suitable for a Dutch system called The New Cultivation (HNT), using which as little energy as possible is lost.
In Venlo greenhouses, the span of the trusses is available in dimensions with a bay width of 8.00, 8.54, 9.60, 12.00 and 12.80 metres. Custom work is also possible, and every The Bom Group greenhouse is fully adapted to local climatic conditions.

Twinlight® construction
For the new generation of 'high'-roof greenhouses, The Bom Group has developed the Twinlight® construction. As the greenhouse column consists of two narrow, thin uprights rather than a large solid tube, more light is let through to the crop and less material is needed. The cultivation area remains the same because the underside of the downwards-tapering column is not wider than the dolly. The top of the custom upright has the same width as the truss so that the screen always closes off properly. The innovative Twinlight® construction with its smart cross-connection makes taller greenhouses possible. For you, this means a more consistent cultivation climate.

Glass types
Light is one of the primary growth factors for plants. When a greenhouse is designed, much attention is paid to this so that a minimum of light-interrupting factors are present. Growers pay a great deal of attention to matters such as increased light transmission.

AR glass features an anti-reflection coating; this ensures greater light transmission. For direct light, this is around 5% higher than standard horticultural glass, and for diffuse light 7% higher. A substantial increase in production is possible due to this. Because the light transmission is greater for diffuse light and when the sun is lower, the transmission is beneficially affected particularly in the winter.

Further, in the development of horticultural glass, ever more attention is being paid to diffuse glass.
In diffuse glass, the light entering is distributed in a different way and is scattered more in the greenhouse (haze). In this way, there is a reduced shadow effect in the greenhouse and better distribution of the light. Diffuse light penetrates better into the crop, so that photosynthesis is made more efficient. This in turn allows increased production to be realised. Particularly with tall-growing crops such as tomato, sweet pepper and cucumber, this is a great advantage.

Greenhouse roof systems
When choosing greenhouse roof material, a number of assessment criteria are significant. A grower particularly wants the greenhouse roof material to enable optimal production at modest cost. Other decision criteria are translucency and energy savings. Also, the degree to which the greenhouse roof allows UV radiation through may play a role. Further, the choice of roof affects the reduction of insect pests, moulds and viruses. At thee Bom Group, we supply you your greenhouse with our own greenhouse roof systems. They are resistant to the most severe weather conditions and feature our innovative aluminium PB Gutter.

Ventilation systems
Natural ventilation is one of the primary ways of controlling the humidity and temperature in a greenhouse. Greenhouse ventilation systems serve to air the greenhouse via roof vents to maintain the correct interior climate. Depending on the local circumstances, this may be via roof vents mounted alternately or via a continuous ridge ventilation system. With the ridge system, ventilation takes place via two roof vents per bay, one on each side over the whole length of the bay.