In the publication it is a question of construction of hothouses of the Dutch firm "Beters". Venlo type hothouses in the world enjoy wide popularity, than all the others. They are used for cultivation of tomatoes, pepper, cucumbers and other crops.
The hothouse of the Venlo type has the main advantage – it gives the chance to connect a broad range of requirements even if they seem, obviously, incompatible. Use of these hothouses minimizes consumption of energy.
The being UPDATED VIEW OF DESIGN AND CONSTRUCTION of HOTHOUSES of NEW GENERATION FROM the DUTCH FIRM "BETERS"
The Beters firm more than in 75 years grew in the producer of high-quality hothouses of all types known for the whole world: venlo – hothouses, it is wide – ship hothouses, hothouses – cabriolets, the garden centers and production buildings.
Venlov type hothouses the world use bigger popularity, than all the others. They are used for a wide range of the purposes, at constant innovations can correspond to the most extreme requirements. Beters hothouse projects postroit and your optimum hothouse of Venlo.
The universal hothouse of the Venlo type has the main advantage – it let’s a vozmozhyonost connect a broad range of requirements even if they seem, obviously, nesovmesyotimy. For example, plant growers want to have the equipment which interferes with light and holds it on a minimum, and during too time to have a powerful hothouse. Or they xotyat narrow trench, but effective storm branch. Beters can put all views of trenches from steel and aluminum of all sizes. All systems of trenches of Beters firm are carefully developed – as rastenievod, you can count on a roof of a hothouse which is voyodonepronitsayemy.
Consumption of energy is an important factor. Beters helps to minimize it. The hothouse of the Venlo type will satisfy requirements of plant growers, kotoyory aspire to have a hothouse with wide flights.
Design and construction of hothouses of a new poyokoleniye
On the average hothouses annually new under construction on 10 cm become higher (Stalduinen, 2005). The Netherlands institute of a hothouse stroiyotelstvo on the instructions of the ministry of celckogo of an economy and production of the closed soil studied effects from increase in height tepliyoets.
At this research various measurements and experiments in 22 hothouses on cultivation of cucumbers and 24 hothouses on cultivation a tomato were made.
Methods and research conditions
The climate in calculations was simulated in a hothouse. It is a calculation method in which streams of air and a difference of temperatures in a certain space are defined on the basis of the set conditions. Hothouses of three various heights were investigated. Facades were enough zaizolirovany. In again under construction hothouses ispolzuyutsya modern insulating materials. In practice also loss of heat is compensated by zashtorivaniye system.
Researches showed that height of columns from 5 to 5,5 most rational for a vyrayoshchivaniye of various cultures.
Exception are hothouses for cultivation of tomatoes, pepper and cucumbers – their height kolonn makes 6 m and above – it is a new standard (Arkesteijn, 2006).
Use of lamps of a dosvechivaniye an iustanovka of system of a zashtorivaniye – very important reason for application of the above-named height of columns. For optimum use of light and the correct distribution of light of a lamp of a dosvechivaniye it is impossible to suspend a lamp close to plants. The minimum distance of 2 m from a dosvechivaniye lamp to a plant is insistently offered.
Also because of application of system of a zashtorivaniye the hothouse volume estestyovenno a buferprostranstvo decreases. That to prevent it the hothouse should be higher. The requirement of vegetable growers that the buffer over plants became more as far as so, it vozyomozhno, also because of use of system of a tumannoobrazovaniye and an irrigation. The increase in height of columns is also necessary for Poyoetom. At a dosvechivaniye and use of system of a zashtorivaniye the sufficient distance between lamps and a zashtorivaniye with a view of fire safety is necessary and poyoety also it is necessary to increase height of columns.
For these and other technical reasons it is necessary to build higher hothouses for a vyyorashchivaniye of tomatoes, pepper and cucumbers.
High hothouses are better ventilated
In a high hothouse (6 m) air has more space for circulation therefore it from one ventilating frame to another goes better. At insignificant opening of ventilating frames in a hothouse in height of 6 m ventiliruetsya it is much better, than at complete opening of ventilating frames in hothouses in height of 4 m. Speed of moving of air in a hothouse is braked because of plants; because of what worsens teploobmen. This effect is much higher in low hothouses, than in the high. Difference, respectively, 5 % and 2,5 %.
High hothouses are ideal when using a zashtorivaniye and systems of a drop irrigation (tumanoobrazovaniye and irrigation systems)
The space in a hothouse in height 6m and above promotes creation of the best climate in a hothouse when using the above-named technical installations. Issleyodovany confirmed this statement stated earlier by vegetable growers. The reasons called above, are the major and gollandyosky vegetable growers want to have for cultivation of tomatoes, pepper and cucumbers only hothouses of 6 m and above. When using an energy saving zashtorivaniye the difference of temperatures over rasteyoniya is insignificant, in comparison with, if an energy saving zashtorivaniye not ispolzuetsya. Power consumption decreases more than for 60 % at completely closed system of a zayoshtorivaniye.
Power consumption is identical irrespective of height of columns provided that the energy saving zashtorivaniye is used
High hothouses are ideal when using lamps of a dosvechivaniye
The hothouse height when using lamps of a dosvetka is very important. In order that poluchit good distribution of light over plants, the lamp of a dosvetka is rather highly over plants and doesn’t put them damages. Therefore, the hothouse is higher, the this effect is higher.
Construction of hothouses with height of columns of 6 m has clear considerable advantages to cultivation and collecting a healthy and high-grade crop. It is natural that all this has direct influence on productivity (at observance of all necessary requirements and tekhnoloyogiya) and reach 90 kg with 1 sq.m.
Fuller information on projects and construction of hothouses of the Dutch turnkey firm "Beters" can be received on telefonu27-65-64.