Hobby greenhouses
polycarbonate panels
Cellular Polycarbonate Greenhouses Complete building system for turn-key green houses Natural vegetables produced by yourself, without fertilizers
Greenhouse description polycarbonate covering Metallic structure, U, Z and L profiles made of zinc plated steel, S 235, IP high resistance screws, class 8.8, zinc plated. The metallic structure is approved by the MLPAT (ministry of public works and site arrangement). Snow resistance: 200 kg/m2, wind resistance: 0,6 Kpa/m2, according to the designing code: CR 1-1-3-2012, according to the regulation: CR 1-1-4-2012, earthquake resistance: 0,32g (site acceleration, according to the norm P100-1-2013. Metallic structure, ridged roof and vertical walls. The metallic structure with the above mentioned dimensions is made of metallic profiles, type S 235, being corrosion protected by zinc plating. The metallic structure is made of piles, beams, wedges, struts, vertical and horizontal bracings. The frames are fastened into reinforced concrete sleeve foundations according to the structure’s technical design. The structure is calculated according to the norms in force. The resistance of the metallic structure has been calculated in such a way as to support the further installation of solar panels on the roof of this greenhouse.
Standard sizes: 300 m2, width: 14 m, length: 22 m, rain shadow height: 2.4 m, ridge height: 3.3 m
Snow resistant Wind resistant Earthquake resistant
Equipment of the polycarbonate covered hobby greenhouse Polycarbonate characteristics:
The walls will be provided with 4 natural ventilation air flaps, automatically opened by means of hydraulic actuators (automatically opened at 25°C and closed at 17°C). The roof is plated with 10 mm transparent cellular polycarbonate. The walls are covered with 6 mm thick transparent cellular polycarbonate.
UV- protection against aging due to solar rays;
The 1600 x 2010 mm pedestrian door is made of zinc coated steel, plated
Produced by the co-extrusion procedure with laminated UV-absorbers; this technical procedure leads to a durable transparency of the polycarbonate
with 6 mm thick polycarbonate.
panels and a high resistance to impact.
ends, with longitudinal tubes at every 60 cm, equipped with individual taps,
Optional: automatic drip feed irrigation system, ½” in the field and 1” at the fastened on the ground, provided with humidity sensors, automatic starting
Light transmission: 83% (76% for glass); Thermal transfer: 2.8 W/m2 °K (glass: 5.4 W/m2 °K)
depending on the soil humidity, combined with hour/day setting system. The irrigation system is made up of a drip feed hose, (the distance between the dripping points being of 20 cm), soil humidity sensor and taps. The irrigation system is connected to the client’s water source (min. 1 atm.)
Cellular polycarbonate
Heating system!
The heating system is not included in the price but it can be supplied on demand
Heated greenhouses for out-of-season vegetable production There heating
are
different
systems.
greenhouse They
differ
according to the used fuel, such as: -Wood, sawdust, coal cakes, pellets; -Gas, propane gas in tanks; -Geothermal hot water; -Steam from cogeneration stations; -Heat pumps – water/water, water/ air, air/air (adequate for heating and cooling).
According to the chosen fuel can be structured the thermal plant, the thermal carrier distribution system (tubes for liquid heat carrier and air metallic piping in case of distribution by mechanical ventilation) in the greenhouse and the transfer of thermal energy towards the plants (ducts, registers, radiators, fan convectors). The cellular polycarbonate used for covering green houses ensures thermal insulation much more efficiently than glass or other materials, the joints are tight and there is a maximum greenhouse effect. Thanks to the high thermal insulation, the caloric requirements during winter, at ∆T 45 (outside -20°C, inside 25°C) do not exceed 50W/m3 that can be obtained by a station of about 40-46 KW in case of our greenhouse. The KW economy is important as compared to the glass green houses or foil greenhouses where we need 160W/m3 to obtain a similar ∆T.
Procedures
cultivating procedures
THE CULTIVATING PROCEDURE Yellow Cherry Tomatoes –Ciliegia Gialia and Cherry Principe Borghese
Yellow Cherry Tomatoes –Ciliegia Gialia and Cherry Principe Borghese At the beginning of January, the growing procedure of tomato seedlings will be started. The purchased and ecologically certified tomato seeds will be disinfected against several diseases. The disinfected seeds will be planted in recipients which contain a layer for sowing formed of a mixture of mould, virgin soil (furrow soil) and river sand, in the following ratios: 60%, 20% and 20%. The seeds sown in the green house will be kept at a constant temperature of 20 - 25 °C. After the tomatoes start growing, they will benefit of more artificial light and moderate wetting. By the end of February, the tomato seedlings can be planted by rows in the greenhouse. Before planting the tomato seedlings, the soil has to be prepared by adding compost and mould, by disinfecting the field and by soil crumbling and loosening. The seedlings will be planted on double rows, mechanically, by means of a planter device with 2 rows. The distance between the double rows is of 60 cm, 100 cm respectively. The distance between plants in a row is of 40 cm. After planting, the drip feed hoses will be manually placed on rows and the technical biodegradable mulching material. The tomato plants will be first tied with disinfected strings. While the plants are growing, the shoots should be constantly pulled out, the tomato plants will be fastened to the strings by clips, the lower leaves will be removed and the tips of stems should be trimmed. The irrigation process takes place differently, in several stages during a day, according to the flowering period, while fruits are formed, the tomato plants get a water surplus, after the tip of the plants will be cut off, the water quantity will be reduced. By means of the irrigation system, we spread liquid treacle for the soil fertilization. The tomato flowers will be fecundated by means of both bumble bees and by shaking and moving the plants.
Rufy Roof Engineering
Procedures
cultivating procedures
Cherry Tomatoes and Arugula – continued At the end of June we have the first crop of tomatoes. The fruit are harvested by cutting the base of the fruit bunch. After harvesting, the tomatoes are placed in cardboard boxes, in 4 layers to be protected against squashing. The tomatoes are harvested weekly until the end of October. They are transported to local distributors by vehicles equipped with refrigeration systems. By the end of October, the tomato cultures will be discarded, the irrigation hoses will be rolled up and the remaining tomato plants will be crushed and incorporated into the soil by means of disc motor-hoes.
At the end of October arugula will be cultivated in green houses. The ecological seeds of arugula are sown by means of the mechanical sowing machine in loose and well crumbled soil by the discs of the motor – hoes. 150 cm wide lots should be sown; the dripirrigation hoses will be laid on those lots. The distance between rows per lot is of 15 cm.
During the half of December, the external arugula leaves will be harvested. The arugula leaves will be picked up by hand, two days per week. The picked arugula leaves will be transported on the same day to the distributors packed and sold.
in order to be
The arugula leaves will be transported in special boxes by a refrigerating truck. During the half of January the arugula plants will be discarded and the remains will be buried into the soil for composting.
COMMERCIALIZING OBTAINED PRODUCTS
Wetting should be done once a week by means of the drip irrigation system.
The Yellow cherry tomatoes –Ciliegia Gialia, Cherry
The density of the arugula plants should be reduced.
Principe Borghese and the arugula leaves will be commercialized to the distributors in your area. The cherry tomatoes and arugula leaves are used for the preparation of healthy salads, being more and more appreciated by the Romanians and there is an ever growing demand for
these products.
Design “(1) Construction works are allowed only if a building or demolishing permit has been issued, according to the existing law, at the request of the owner of a real right on a building – site and/or constructions identified by a land register number, unless otherwise specified by the law. (2) Civil engineering and industrial buildings including those for supporting installations and technological, agricultural or any other equipment can be achieved only if the building permit issued according to the law in force concerning designing and execution of buildings will be observed.” Designs carried out by us:
DTAC (design for authorizing building works) DTOE (technical documenta8on for organizing the execu8on
of
works)
PT - DE (technical design and execu8on details) Designing, building, moun/ng, installa/on and workmanship. The green will be erected by personnel skilled in our company.
house
GREENHOUSE DESIGNING For the building of green houses on the territory of Romania it is necessary that you have a design, as required by the law. You should get a planning cer8ficate and a building permit before star8ng the building works.
Green House Shading The tomatoes require 40 – 60% shading during the summer months
Soil Humidity – pH – Radiations THE MOSTLY USED SHADING SYSTEM IS THE SHADING NET WHICH IS COMMERCIALIZED ACCORDING TO THE SHADING DEGREE (30 – 70 %). THE PURPOSE OF THIS SYSTEM IS TO FILTER THE SUN RAYS. DURING JULY – AUGUST THE SUN RAYS, I.E. THE SOLAR RADIATION IS MUCH TOO STRONG FOR THE MAJORITY OF VEGETABLES. THE SAID RADIATION CAN BE MEASURED BY A LIGHT SENSOR WHICH IS EXTREMELY ACCESSIBLE.
The humidity of the soil where the seedlings of tomatoes or other vegetables are planted should be checked on a regular basis because only by the drip irrigation system can the necessary water be supplied. The drip irrigation system can be checked manually, by taps, or automatically by humidity sensors and automatic valves/taps placed on the water supply system. The pH value should be adapted to the soil type. Soils with pH values ranging between 5.5 and 7 are to be preferred. The solar radiations are controlled by shading using resistant UV nets which have different light transfer coefficients. Polycarbonate is a luminescent collector of solar radiations with a maximum green house effect. During the weak illumination period (90% of the time), polycarbonate amplifies and distributes the light to the green house. During the months of July and August, the radiations are much too high so that the accumulated heat is very high (no matter how much we ventilate the area), therefore it is necessary to use the shading net that functions as a solar barrier. The shading degree differs according to the area of the construction; there is a difference between the north and south of the country. For a more precise estimate, the solar radiations should be measured by a special sensor.
The hobby greenhouse
is the perfect choice for lovers of
gardening who want to eat fresh and high quality vegetables all the year round. The greenhouse can be used for: -Early cultures of seedlings (for green houses and cultures in open fields); -Cultures of various vegetables, for personal consumption; -Storage of plants and flowers in pots; -Installing solar panels on the green house roof (for producing electric power).
PURPOSE OF HOBBY GREENHOUSES
Cultures of seedlings. The hobby greenhouse is a tight construction which does not allow for heat losses; therefore by the end of January seedlings can be started . The disinfected vegetables seeds will be sown in trays filled with a mixture of garden mould, furrow soil and sand (or peat). For the seeds germination, the trays should be covered with a plastic foil. Seedlings of cabbage, tomatoes, cucumbers can be obtained and later on planted in the green house or in an external garden in open field. Vegetable cultures. You can grow vegetables and herbs all the year round in the hobby greenhouse. In the month of December green onion, green garlic, lettuce, spinach, arugula, etc. will be started. At the beginning of march after the cultures of onion, garlic, lettuce, radishes, spinach, arugula have been removed completely or partly, tomatoes, green beans and early cucumbers will be planted. In April Kapia peppers and gogoshary peppers will be planted. At the beginning of June, tomatoes, cucumbers, peppers, etc. will be weekly harvested for personal consumption. In October the vegetable cultures will be removed and incorporated into the soil. By using ecological cultivating methods, the environment and the health of the consumers of products obtained in green houses will be protected. Storage of perennial plants and pot flowers. As the pot flowers are sensitive to cold and affected by high differences of temperature between day and night, they will be stored in the green house. Green house arrangement during the winter season. The green house can be transformed into a closed pavilion, a place for spending free time, protected against the cold weather, a place to relax during the cold winter. It is possible to install an electric station with solar panels on the roof of the green house. The resistance of the metallic structure has been calculated since the design stage to enable further installation of solar panels on the roof.
Rufy Roof Engineering
Automatic opening of windows and air flaps by means of hydraulic actuators Stainless
Hydraulic
actuators
The hydraulic actuator is a revolutionary system used for opening the flaps for natural ventilation. These flaps do not use electric power and they don’t need to be opened by hand – their operation is quite simple, when the inner temperature of the green house reaches 25°C, they start opening and when the temperature decreases below 17°C, they close automatically. The actuator is equipped with a pressurized metallic piston which contains a mineral which expands at high temperature pushing the central piston which gradually opens the windows. When the temperature decreases, the minerals get smaller, a spring closes the ventilation and resets the piston. The opening and closing operations are done gradually, enabling the transfer of the air flow necessary for cooling the green house. Compared to the electrical linear actuator systems, the costs are much reduced because neither electrical devices, nor sensor central stations are necessary. Natural ventilation is extremely important for a green house; thanks to the hydraulic actuators ventilation is done during the day and the air flaps no longer remain open during the night as it happened before when someone forgot to close them, the destruction of cultures is thus avoided.
The polycarbonate panels are protected against aging produced by the destructive action of the sun rays. These polycarbonate panels are produced by the co-extrusion process with laminated UV absorbers. This technique makes sure that the polycarbonate panels
ROOF SYSTEMS AND POLYCARBONATE WALLS The thickness of the polycarbonate panels used for the green house roof is of 10 mm, the wall thickness is of 6 mm. They are UV protected against aging caused by solar rays. The polycarbonate panels are produced by co-extrusion with laminated UV absorbers. Due to this technique, the polycarbonate panels keep their transparency having at the same time a high impact resistance. Luminous transmission: 83% (76% for glass); Thermal transfer: 2.8 W/m2 째 K (glass 5,4 W/m2 째 K; Impact resistance: 2 KG without damages, hail resistance; U and H polycarbonate profiles are available for panel joining. These profiles have a protection role, i.e. of panel joining. Guarantee The polycarbonate panels have a 10 year guarantee since their delivery, against yellowing aging and hail. If you need a higher insulation and additional resistance, we can offer you polycarbonate panels with several rooms with a thickness ranging from 16, 20 to 60 mm.
keep their transparency features having a high impact resistance. Due to the reliability of the panels , they can be used in an extremely large range of areas. The part protected by co-extrusion against UV is separated by a foil with the product name on it.
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Polycarbonate Hobby Greenhouse Budget – Costs In this chapter the elements included in the green house costs can be identified. These costs have been established in Euro
Description
U/M
Quantity Unit price
Value without VAT
Design, DTAC stage
m2
300
0 €
Metallic structure*
m2
300
0 €
Concrete sleeves for pillars (0,2 x 0,8)
piece
27
0 €
Entrance door**
piece
1
0 €
Windows in lateral walls fitted with hydraulic actuators (automatic opening)
piece
4
0 €
10 mm roof polycarbonate together with H10 profiles and self drilling screws with washers
m2
554,4
0 €
6 mm wall polycarbonate together with H6 profiles and self drilling screws with washers
m2
100,8
0 €
Chute between naves)**
ml.
23
0 €
Sheet metal ridges***
ml.
46
0 €
Gable brackets***
ml.
67
0 €
Workmanship for mounting delivered materials
m2
300
0 € subtotal
0 €
VAT
0 €
Grand total
0 €
*metallic structure formed of zinc plated U, Z and L profiles fastened in gussets of thick steel sheet of 5 mm, primed and painted, fitted with high resistance screws. The roof and wall panels will be fastened by self drilling screws. ** the door is made up of metallic, zinc plated L profiles, sized 1600 x 2010 mm, plated with 6 mm thick polycarbonate. *** materials made of steel sheet, zinc plated and painted with polyester – thickness 25 µm (microns)
Rufy Roof Engineering
For additional information, please contact us at : Tel: +40371.077.111 +40726.676.633 Email: office@sere-natura.ro
Web: www.sere-natura.ro
OUR COMPANY OFFERS YOU POWER EFFICIENT BUILDING SYSTEMS FOR GREEN HOUSES AND ANNEXES (COOLING CHAMBERS, WASHING AND PACKING ROOMS). THE METALLIC STRUCTURES HAVE BEEN SPECIALLY DESIGNED FOR ROMANIA TAKING INTO ACCOUNT THE NORMS FOR SNOW LOADS, WIND AND EARTHQUAKES.THE WORKS ARE TURN KEY AND THERE IS A GUARANTEE WITH FAST INTERVENTION IN CASE OF NECESSITY. THE USED MATERIALS HAVE BEEN CAREFULLY CHOSEN TO ENSURE HIGH QUALITY PRODUCTS FOR LONG TERM UTILIZATION.
RUFY ROOF ENGINEERING LTD Hermes Business Campus, Blvd. Dimitrie Pompeiu, No. 5-7, Floor 2, sector 2, RO-020335, Bucharest, Romania. Tel: +40371.077.111 +40726.676.633 Email: office@sere-natura.ro Web: www.sere-natura.ro