Design

The highest level of technical development, professionalism, as well as a clear organization of the production process guarantee our customers the timely delivery of materials that meet international standards for commercial greenhouse facilities, as well as installation at a high-quality level. We are pleased to offer to your attention  the 5th generation Active Climate greenhouse of Venlo  type and arched Gothic greenhouses with film and polycarbonate coating and a bay width of 9.6 m and 12.8 m. Designs of this type are widespread throughout the world and have certainly proved their worth by their reliability. During the construction, high-quality materials are used. All steel parts of the structure are galvanized, which extends the service life and protects the material from corrosion.

In the construction of the foundation, we use support structures of the Zeus type, which are installed on a reinforced concrete layer.

This design of greenhouses provides for ventilation windows. Their area is at least 25% of the total, which makes it possible to maintain the optimal intake of outdoor air to maintain optimal temperature conditions during intense solar radiation.

One of the important parameters of greenhouses is their high light transmission. This effect is achieved due to the optimal placement of the heating system and the verified design parameters that impede the entry of light into the greenhouse. This makes it possible to provide plants with an optimal level of lighting.

Project specification

  • Model:  NIVA -1280
  • Greenhouse type: block
  • Grow tray level height: 4.5 m
  • Ridge height: 8 m
  • Bay width: 12.8 m
  • Distance between outside posts: 2.5 m
  • Distance between inside posts: 5.0 m
  • Distance between arches: 2.5 m
  • Roof covering material:double polyethylene with blowing between the film layers
  • Perimeter coating material: polycarbonate

Structural load

  • Wind: 130 km/hour
  • Trellis load: 25 kg/m²
  • Snow: 40 cm of fresh snow, 470 N/m²
  • Load margin: 1.25

Specifications

  • All structural parts are fully hot-dip galvanized with the use of Sendzimir method, Z-275 g/m² and Z-450 g/m².
  • All steel structures of the greenhouse are manufactured in accordance with the specifications of UNE 36.130/91.
  • One-year manufacturing defects warranty for all equipment.

Project specification

  • Model:  NIVA -1280
  • Greenhouse type: block
  • Grow tray level height: 4.5 m
  • Ridge height: 8 m
  • Bay width: 12.8 m
  • Distance between outside posts: 2.5 m
  • Distance between inside posts: 5.0 m
  • Distance between arches: 2.5 m
  • Roof covering material: double polyethylene with blowing between the film layers
  • Perimeter covering material: double polyethylene with blowing between the film layers

Structural load

  • Wind: 130 km/hour
  • Trellis load: 25 kg/m²
  • Snow: 40 cm of fresh snow, 470 N/m²
  • Load margin: 1.25

Specifications

  • All structural parts are fully hot-dip galvanized with the use of Sendzimir method, Z-275 g/m² and Z-450 g/m².
  • All steel structures of the greenhouse are manufactured in accordance with the specifications of UNE 36.130/91.
  • One-year manufacturing defects warranty for all equipment.

Service premises

For the effective functioning of the greenhouse complex, appropriately designed service rooms are essential. At the design stage, wishes regarding the internal movement system and the growing methods used are taken into account.

 

Service rooms include:

1. Boiler-house and mixing room, according to verified design parameters of heating and irrigation.

2. Sorting room designed according to the area depending on the set of equipment (sorting units, lines, manual sorting)

3. Warehouses
  • chillers
  • storages
  • inventory warehouses

Heating system

When implementing an integrated project, the heating system is essential. It is the nervous system of the modern greenhouse economy which should operate reliably. The company has a wide range of materials and equipment.


Modern gas and solid fuel boilers
Suspended heating systems
Heat accumulation systems
Condensing units
Carbon dioxide meters
Pumps, valves and other equipment

 

The entire central heating system is designed according to the Tigelman principle, which means that equal resistance will exist throughout the circuit and an optimal heat distribution in the system will be achieved.

 

Boiler-house equipment
 
Boiler equipment can be different, both in type of fuel, and in set tasks that must be solved during operation. The boiler will be connected to the central manifold, which will be located in the boiler-house. We provide the whole set of materials necessary for a complete installation in the boiler-house. Connection of the manifold with boilers will be made with the use of supply and return line, with the installation of automatic deaerators
To adjust the pressure change when the volume of water in the system changes, a pressure maintenance tank will be installed in the boiler-house.
Pressure maintenance tank
To adjust the pressure change when the volume of water in the system changes, a pressure maintenance tank will be installed in the boiler-house. The pressure maintenance tank will be connected to the turning line on the manifold.
Manifold
The main manifold will be mounted in the boiler-house. Connection of the manifold with boilers will be made by the supply and return line, in which automatic deaerators will be installed.

Pipe-rail heating system

A pipe-rail heating system will be installed in the greenhouse. It is the lower heating circuit and at the same time serves as transport lines for moving trolleys between the rows. This system is installed at a height of 11 cm from the floor with the help of special securing stands. Typically, pipes with a diameter of 51 to 60 mm are used for this system, which are connected to distribution lines along the end cover.

Tray heating system and growth pipe system.
The tray heating system is located in the plane of the upper horizontal structures and is designed to prevent freezing on the roof glass and snow melting in the upper gutters. A steel pipe is used for it, suspended on hooks under the gutters. All pipes will be connected to the transport pipes along the end wall.
Heating pipes are connected in parallel with the upper and lower circuits of the heating system, so that the upper pipes are connected to the tent (upper) circuit, the lower pipes to the pipe-rail (lower) circuit.
СО2 installation
 
A condenser is needed to cool СО2. It will be located behind the boiler in the boiler-house. The control panel required for its operation will be mounted on the burner panel. The condenser circulation system is connected to the return pipes by means of rotary dampers. To spread СО2 in the greenhouse, a fan will be mounted on a steel frame with all the necessary additional materials. Together with СО2 equipment, a sensor is installed to measure the CO level. To obtain the optimal proportion between clean air and exhaust gas, a temperature controller is installed.

Curtaining system

The curtaining system is designed to reduce the air temperature in the greenhouse during periods with excessive solar radiation - shading of plants, as well as heat loss in the cold season, creating a more uniform and favorable temperature regime for plants throughout the entire area of the greenhouse. The design of the curtaining system allows the polymer screen to be moved simultaneously in all bays. The geared motor is kinematically connected to rack gearboxes mounted on trusses in the central part of the greenhouse. The shield is opened (closed) as necessary remotely using button or in automatic mode.

Energy-saving installations, created as part of an integral project, make it possible to optimally place them, as well as average annual energy savings of up to 30%. There are two types of drive gears for curtaining systems: a rack-and-pinion system and a wire rope system. When using the rack and pinion system, the movement system consists of a gear wheel and a rack, and when using a wire rope - a shaft and a wire rope.
Depending on the type of crop grown, we offer you various types of canvases. Also, if necessary, installation of a double curtaining system is possible.

Watering and drainage system

For plant growth, an important, balanced nutrition plays an important role, which, under the conditions of low-volume technology of closed soil, can be provided by a technologically thought-out and professionally executed irrigation system. With its help the plants get all the necessary nutrients and minerals. It consists of a number of units and systems, each of which is separately responsible for the operation of the entire irrigation complex, controls the path of nutrients from concentrated mixtures to a ready-made balanced solution.
The drip watering system includes:
  • Solution assembly
  • Distribution network
  • Capillaries and drippers
  • Pump installation
  • Irrigation installation
  • Flushing line
  • Drain collection system
  • Water supply tanks
Solution assembly 
 
 
Designed for the preparation of a nutrient solution with a given EU concentration and optimal pH value by mixing two or more master solutions and acid. After filtration, the finished solution is fed into the drip network according to the program set by the computer, with constant measurement and control of the conductivity and pH of the solution. The control unit allows you to automatically, according to a given program, change the concentration of the nutrient solution during the day. In addition, it daily calculates the averaged characteristics of the solution, its volume and the time of irrigation through each valve and saves these data for six months for monitoring and analysis.
Distribution network
The distribution network ensures a uniform flow of solution to each plant using a complex of pipelines and drippers. The nutrient solution from the solution assembly enters the main PVC pipeline. Then, through the control valve and the computer-controlled solenoid valve, the solution enters the PVC dispensing pipe. The dispensing pipeline through tees is connected to polyethylene sleeves on which droppers are mounted with the capacity required for a particular crop. A network fragment connected via an electromagnetic valve can operate according to an individual program.

Drippers and capillaries

 One of the most convenient forms of irrigation in closed ground conditions is drip watering. Mats with a substrate are often used as a medium for growing various types of vegetables (cucumbers, tomatoes, etc.). The nutrient solution in the mats with the substrate is served using droppers.

There are many versions of the dripper itself, which choice depends on the type and volume of the surface to be watered (for example, the size of the pot or other container), the needs of the plant itself, etc.

Water tanks

  • clean water storage tanks
  • drainage water storage tanks
For storage of irrigation water, we offer you galvanized tanks made of corrugated sheet for storing a one-day supply of water based on the calculation, for example, for tomato - 10 l/sq.m/day, for roses - 5 l/sq.m/day.

Computer and electrical installations

The automated microclimate control system is designed to control the climate in the greenhouse and monitor the external weather conditions, analyze the data and carry out calculations to maintain the specified microclimate and СО2 concentration in the greenhouse. The developed operating modes of the system allow coordinated control of heating circuits, ventilating windows, feeding СО2, a curtaining system, fans for forced air circulation and other operations depending on the specified parameters.

A single computer network is created; its software functions will include:
  • Multi-climate software
  • English software
  • Control of boiler equipment
  • Control of drip watering system and mixer-dispenser with automatic maintenance of a given composition of nutrient solution
  • Monitoring meteorological conditions
  • Maintaining the set temperature, if necessary, in several climate compartments, using hot water temperature sensors and temperature and relative humidity sensors in the climate compartments of the greenhouse
  • Automatic control of the curtaining mechanism
  • Automatic control of ventilating window electric actuators
  • СО2 measurement, recording and metering
  • Automatic fan control, sequential ventilation

Ventilation

The air recirculation system in the greenhouse is designed for its artificial mixing in order to more evenly distribute the temperature layers, reduce overheating of plants, activate physiological processes in plants, eliminate zones with high humidity, especially during periods when natural ventilation through the ventilating windows is impossible or ineffective. The system includes axial fans and electrical equipment. The fans operate in automatic mode.
If there is no air circulation, the difference in temperature and relative humidity may increase. Open ventilating windows ensure this ventilation. If the ventilating windows are closed, the climate in the greenhouse will be uneven and therefore not optimal. For this reason, we offer you a recirculation fan system

 

Assimilation supplementary lighting
As you know, without light, the life of plants and photosynthesis process important for their life are impossible. Different crops need different amounts of light. The first group includes vegetables such as peppers, lettuce, cucumbers, tomatoes, etc. They should be continuously lit at least 10 hours a day. Representatives of the second group are dill, parsley, onions, etc. The supplementary electric lighting systems are provided for artificial illumination of crops up to a level from 6,000 thousand lux up to 20,000 thousand lux depending on the needs of plants and technology features.
There are several methods, in particular:
  • Cyclic lighting to stimulate the development of plants by changing the duration of the day and night
  • Assimilation lighting to accelerate plant growth
  • Lighting to achieve improved shape
The application of the above methods has many advantages, such as:
  • The growing season is reduced
  • The quality of produced vegetables and flowers is improved
  • Increased yield
  • The area of the greenhouse is used more efficiently
The required number of lighting fixtures is selected depending on the design of the greenhouse, the height at which the lighting fixtures will be suspended, as well as the lighting voltage for a specific crop.