Cooling and ventilation

Greenhouse fan and pad system is part of the Evaporative Cooling System. Its function is that by sucking the exhaust fans, water particles enter the air from the cellulose pads installed on the other side of the greenhouse, and these particles absorb the ambient heat to evaporate, thus cooling their air path. / p>

The main advantage of this system compared to the fogger and the fan is that in the fogger, water with low EC and TDS must be used, but in the pad, by observing a 2 to 3 percent water consumption during the operation of the pad, it is possible. It used low quality water.

This greenhouse cooling system uses air drainage fans, cellulose pads, storage tanks and backpackers, pumps, water pipes and filters, drainage and return equipment, and The top and bottom frames of cellulose pads (galvanized or aluminum) are formed.

The structure and formulation of the pads make it impossible to make it in many countries, despite its many advantages. Today, due to the special production technology of this product, only a limited number of companies are engaged in its quality production. Therefore, selecting and using cellulose pads requires sufficient knowledge and experience. The use of cellulose pads that are only similar in appearance to the original samples not only deprives the greenhouse owner of its benefits, but also imposes a high cost on the employer.

as well as the variety of drainage fans Air and their capacities have made the design of fan and pad system play a role in temperature control as well as cost management.

In designing this system, you must first ensure the efficiency of this system according to the humidity and temperature of the area. Because this system has the lowest efficiency in high humidity conditions and is the most effective cooling method in hot and dry areas. Of course, in the northern regions of Iran in spring and autumn the humidity is less than the annual maximum and also in summer during the hot hours of the day due to the greater humidity capacity of hot air, the humidity percentage decreases slightly and the possibility of limited use of this cooling system. p>

Some of the parameters in calculating the amount of exhaust air, as well as the number of fans, pads and…, are:

  • 1- Light intensity
  • 2- Required pad thickness
  • 3- Altitude
  • 4- Calculation of inflow and pressure of inlet water and how to distribute water
  • 5- Calculation of water tanks
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  • 6- Start and end temperature difference
  • 7- How to install and place the fan in the greenhouse
  • 8- Stiff distance (pad) from the fan

    • Of course, designing a basic and practical system of fan and pad at a reasonable price does not end here, adjusting and reducing the intensity of sunlight by the canopy, in addition Creating suitable plant growth conditions will cause maximum efficiency of the cooling system and prevent the temperature from increasing in the distance between the pad and the fan.

    In greenhouses where the distance between the fan and the pad is between 30 and 60 meters, it will have better efficiency. D and other lengths in addition to increasing the cost may make it impossible to run the system properly, in which case the fan and fogger system is a more suitable option.

    Crop rows form a wall The pad and fan must be installed at the beginning and end of the crop rows, otherwise the crop rows will block the air movement of the system, otherwise the calculations will change.

    Two adjacent greenhouses should not place the greenhouse pad in front of the other greenhouse fan. Otherwise, the two greenhouses should be 15 meters apart. In case the fans of two adjacent greenhouses are facing each other, the fans should be installed relative to each other.

Fog system, fogger, fogger

Fogging system is an effective and efficient mechanism for cooling and supplying greenhouse moisture, which is designed according to the type of product and row of crops and other equipment with different pressures and directions.

As human beings, we try to live in a comfortable environment and tend to struggle when we are upset. The same is true of plants. It is very important to create an environment that is ideal for any plant you want to grow. When the humidity level is low, photosynthesis (the process used by plants to harness energy from sunlight to chemical energy) slows down or even stops altogether. By preventing stressful environments, plants can exchange moisture, oxygen, and carbon dioxide. (About one-twentieth to one-third the diameter of a human hair) Using different spray nozzles, it distributes them evenly throughout the environment and above the product. Due to their small size and lightness, these particles evaporate by rapidly absorbing the heat in the space, cooling the space and increasing the humidity. It will not wet the product, which is the most effective way to control the temperature and humidity in this system, so that the water evaporates before reaching the plant.

Some of the advantages and effects of the misting system:

  • Easier temperature control in the greenhouse environment
  • Product growth uniformity throughout the greenhouse area
  • Faster growth of shrubs and produce
  • Larger flowers and colors Brighter in the production of cut flowers
  • increases the quantity and quality of the product and more comfort.
  • One of the advantages of the spray is that the growth of bacteria is minimized. / li>

A misting system is responsible for optimizing and fine-tuning humidity and temperature, which allows more moisture to be absorbed by the leaves of crops and plants. Spray systems are one of the most effective methods for uniform cooling of the greenhouse. Temperature drops of up to 5 ° C occur in shady greenhouses and 7 ° C in shaded greenhouses.

The spray system can also increase the humidity level inside the greenhouse from 50% to 90%. Therefore, there is no more excess moisture in your greenhouse. High-pressure spraying can generate moisture almost immediately, minimizing bacterial growth or damage to crops and flowers.

Greenhouse exhaust fan

In the section of greenhouse fan and pad system, detailed explanations about the efficiency of this system and these fans were provided. In this section, we will give a brief explanation about the types of greenhouse exhaust fans and the specifications and price of the greenhouse fan. p>

First of all, we need to know the meaning of the word greenhouse exhaust fan. Exhaust Fan is a technique that, unlike blower fans, draws air in and out of the environment.

These fans By sucking the greenhouse air which is humidified by passing through the cellulose pad system or by sucking the greenhouse air which has absorbed the moisture by the misting system, in addition to refreshing and removing the old air, it also cools the ambient air.

This suction is done by powerful motors that open the dampers using air force (weight fan) or through centrifuge (clutch fan).

Greenhouse fan in Dimensions 100, 120 and 140 are produced with different powers, of which the exhaust fan 140 is the strongest, but of course the suction power of the fan, different companies are different from each other

Types of exhaust greenhouse fan in terms of mechanism: 140 2-fan weight damper type 140 with clutch or clutch damper The difference between these two types of fans is that in a damping fan or damper, the dampers open with air pressure, but in a clutch fan, the clutch mechanism opens the dampers as soon as the fan is turned on. In humid areas, this fan can be used to reduce or drain the greenhouse moisture and change the air in the greenhouse. And هستند are important points that must be paid attention to.

Calculate the number and type of fan suitable for each greenhouse

Calculate the number and type of fan suitable for each greenhouse It depends on a series of factors, some of which we will mention below:

  • 1- The minimum and maximum temperature of the greenhouse
  • 2- The relative humidity of the area
  • 3- Intensity of light flow based on luxury
  • 4- Intensity and direction of wind flow in the region
  • 5- Required temperature
  • 6- Fan height
  • 7- Pad width or thickness
  • 8- Structure height
  • 9- Length and width of greenhouse opening
  • 10- Height Culture medium
  • 11- Type of fan in terms of suction power, engine speed, fan dimensions and /

< b> Greenhouse dehumidifier

Greenhouse dehumidifier system consists of several exhaust fans with different dimensions are designed, usually a size 100 fan is used to view the price of the greenhouse dehumidifier to the store Visit our Internet, you will enter the store by clicking on the image at the bottom of the page.

It should be noted that this system is mostly used in structures that do not have roof vents.

Heating systems

Boiler and underfloor heating And underfloor heating)

Underfloor heating system and hot water boiler

This greenhouse heating system (Boilers and underfloor heating) is one of the most modern and suitable greenhouse heating systems.

It is also a hassle-free and low-consumption system with excellent efficiency for greenhouse crops, especially hydroponic crops.

This system consists of boilers, ground pumps, main temperature transfer pipes and sub-pipes, fittings and burners, and.

Boiler specifications and heating pipes

The greenhouses of this company have a capacity of 300,000 to 5,000,000 kcal / hr and are supplied with BS855 standard and Iranian national standard.

All sheets used in the manufacture of pressurized parts from The type of fireproof sheet is DIN17155-17MN4, which has a high tensile strength. Welding is performed according to WPS and PQR approved by the standard office and by skilled welders with E7018 electrodes with 300 ° C preheating or with automatic submerged arc welding machine, and with rock wool with a thickness of at least 100 mm and with stainless steel coating. Steel is coated.

The maximum allowable temperature of these boilers is 90 ° C. These boilers have a system and an explosion valve to prevent the combustion explosions of the burner. The floor and wall heating system as well as the greenhouse roof are of two types of seamless fireproof. These sheets are according to DIN17175-ST35.8 standard or steel seam.

Advantages:

  • 1- Uniform heating of the environment Greenhouse.
  • 2- Do not pollute the greenhouse air.
  • 3- Warm the bed.
  • 4- Save up to 40% in fuel consumption
  • 5- In case of plastic rupture or broken glass in a part of the greenhouse cover, less problem will be created for the product than hot air heaters
  • 6- By running the system on the walls, prevent We will also see the arrival of cold load from the walls
  • 7- By running the system on the roof, it can also be used as a rail to move the roof equipment
  • Combustion
  • 9- Having a central system for temperature control
  • 10- Efficiency above 85%

 

Greenhouse heater (greenhouse hot air oven)

Hot air oven (greenhouse cabinet heater) The heating system of a hot air oven or cabinet heater or greenhouse heater is suitable for heating greenhouses less than 5000 meters.

These heaters are provided with two types of upper and lower outlets with three modes of gas burner, diesel burner and dual burner. They are designed and made in the form of 3 passes, with insulation joints, ignition furnace made of steel sheet welded by argon welding method, with 2 axial fans with three-phase electric motor with 2 horsepower and aeration capacity of 32,000 cubic meters per hour and with panel Electrical control with thermostat.

Hot air transfer along the greenhouse is provided upon request.

Jet heater or rocket heater

Jet heater or (jet heater) Jet heater with greenhouse flue gas in various types of gas, diesel and dual fuel and with and without a tank with Different heating capacities and with domestic and foreign brands are offered for greenhouses with different dimensions, height and climate of different regions. The structure and body of the heaters are made of steel.

Heating the greenhouse protects sensitive plants from the worst winter weather. Jet heaters are safe and use pre-determined energy requirements.

Does your greenhouse need jet heaters?

Greenhouses allow gardeners to grow plants at temperatures Cool by trapping the sun’s energy inside and then using the soil beneath it to trap the radiant heat. However, some plants need more heat to grow, so you may need a jet heater.

Benefits and Specifications

      – Easy and low cost installation and maintenance
  • – No need for heater chamber, engine room and duct
  • – Less fuel consumption
  • -High efficiency
  • – Long life and low consumption
  • – Reduces power consumption by up to 70%
  • – Has more wind throw than other heating methods </li >
  • – Ability to install an ambient thermostat to control the temperature
  • – One year warranty and 10 years after sales service

Greenhouse hot water heater unit

The heating system of the greenhouse heater unit is operated by hot water sent from the engine room and by the boiler, and the fan of the device which is from It is an axial type and is fully static and dynamic balanced, with the least possible noise by passing air through the coil, it distributes heat on the surface of the greenhouse.

The structure of the unit heaters is made of galvanized steel and copper pipes Used in these units with a diameter of 8.5 inches and a surface Heat exchange with aluminum fin plate. The heat capacities of the heater unit are from 35,000 to 430,000 BTU per hour. Cheap underfloor heating system