Automatic opening of vents in a greenhouse - buy a ready-made automatic ventilation system or make it yourself? How to make greenhouse doors and vents auto-opening: craftsmen show Do-it-yourself gas lift for a greenhouse

The design of all greenhouses is almost the same: under the influence of sunlight, the air inside warms up, which promotes the rapid growth of heat-loving plants.

Thanks to greenhouses, plants can easily survive temperature changes, both day and night.

But in addition to heat, all greenhouse plants require daily ventilation. If a summer resident lives at his dacha all season, then it is not a difficult task for him to ventilate his greenhouses every day, but for those who visit their site intermittently, this can be a big problem.

Let's look at some of the most effective ways to implement automatic ventilation of greenhouses with your own hands, and also figure out why ventilation of greenhouses is so necessary?

Why is it necessary to ventilate the greenhouse?

The dream of any summer resident is a “smart” greenhouse equipped with an automatic ventilation system.

Greenhouse plants are characterized by their excessive susceptibility to overheating, which can slow down the growth of plants or even kill them.

It is very important that on hot summer days the greenhouse vents are open, since some plants simply do not bear fruit at temperatures in the greenhouse above +32 °C, and if the temperature reaches +40 °C, the plants die altogether.

In addition to all this, various microorganisms and fungi harmful to greenhouse plants will quickly multiply in an unventilated room in hot, stagnant air.

Therefore, it is imperative to organize ventilation in the greenhouse in order to create a comfortable habitat for plants!

Types of automatic ventilation

All modern devices designed to create an automatic ventilation system for greenhouses are divided into several categories:

• independent (autonomous) mechanisms;
• automated energy-dependent systems.

Most energy-dependent systems are powered by electricity, but they can also be powered by solar panels or other energy sources.

The main element of such a system is a thermal relay with specified parameters. With its help, fans are automatically turned on to blow exhaust air outside and supply fresh air inside the greenhouse.

Advantages of a volatile ventilation system:

• the high power of the system allows it to be used in greenhouses of almost any size;
• thanks to special sensors, greenhouses are ventilated at the most optimal time;
• This system is very compact and high-tech.

Do you want to build it yourself? Then you will be interested in studying the detailed instructions regarding this issue.

Warmth, as well as fresh air, are very important for the quality cultivation of seedlings and vegetables. How to make heating in a greenhouse with your own hands.

Disadvantages of volatile ventilation systems:

• a possible failure in the electrical network can cause the death of plants, so there is a need to install an additional (backup) energy source;
• failure of system components in most cases requires “unit” repair;
• Such a system requires money for power supply.

In addition to energy-dependent forced ventilation systems for greenhouses, there are more simplified autonomous versions that do not require a power source to operate.

An automated greenhouse ventilation system is considered the best option for those who visit their dacha periodically.

Modern devices of this type allow you to create a favorable microclimate for plants even when you are not at the dacha.

We create a ventilation system with our own hands

Automatic ventilation of a greenhouse with your own hands can be implemented based on:

• pneumatic drive;
• hydraulic cylinder;
• metal plates.

The video shows the use of a thermal drive to automatically ventilate a greenhouse.

Application of hydraulic cylinder

The operating principle of such a device is based on the expansion of liquid under the influence of warm sunlight.

When the temperature increases, air displaces liquid from one container to another (smaller one). Due to the increased weight of the smaller container, the transom opens.

As the temperature decreases, the liquid is drawn back into the vessel, the outer container becomes lighter, which causes the transom to close.

The advantage of such a system is its absolute autonomy, high durability and reliability. The system does not require electricity to operate.

Among the disadvantages, one can highlight the fact that if the air temperature drops sharply, the vents simply do not have time to close. It is also impossible to use this system with side transoms.

The modern market of hydraulic cylinders is represented by a wide range of devices, but the operating principle is the same for all.

The cylinder filled with liquid (paraffin, oil) has a retractable rod at one end. When the oil expands from the high temperature inside the greenhouse, the rod is forced out and pushes the window.

The higher the temperature in the greenhouse, the more the oil expands and the more the rod extends, opening the window wider. When the oil temperature in the cylinder drops, the window closes.

The video shows one of the possible DIY options for automatically ventilating a greenhouse.

Ventilation using a pneumatic drive

The basis of the operation of such a system is the expansion energy of heated air. In order to make a pneumatic drive for an automatic greenhouse ventilation system, you will need to prepare:

• piston with foam rod;
• rubber connecting hose;
• an old metal canister or any other container for air;
• a cylinder with a diameter of 20 cm with a soldered bottom;
• plastisol ball;
• pulley;
• cord (required for the bowstring);
• rocker.

The rod guide should be attached to the top of the cylinder. To connect to the hose, you need to drill a hole in the bottom.

The pneumatic installation used to create a ventilation system for greenhouses works on the following principle: the air in the canister is heated under the influence of sunlight.

This causes the ball to inflate, which lifts the piston with the rod and, acting on the rocker arm, causes the bowstring to be pulled. Thus, the window swings open. The reverse process of closing the window occurs as a result of compression of the liquid due to a decrease in temperature.

The photo shows a greenhouse ventilation made using a pneumatic drive with your own hands

Use of bimetallic plates

Structurally, this system is made of metal plates that have different expansion coefficients. When the plate heats up, it increases in size and bends strongly, which helps open the window. Reverse process occurs when the plate cools.

In order to make such a device for automatically ventilating greenhouses, you will need metal strips and a planed board (inch).

At the bottom of the greenhouse, you need to attach both parts, and between the metal plate and the stand (slightly lower than ½ the length of the plate), insert a block and fasten everything tightly. The vents are connected to the metal strip using hinges (bolts inserted into the tube).

The advantage of bimetallic plates: ease of manufacture and low cost.

Main disadvantage: the system's power is low, it will be impossible to open a large window using this method.

Operating principle of a bimetallic strip.

Bottom line

In order to maintain a favorable microclimate for greenhouse plants, it is necessary to ensure ventilation of greenhouses (preferably automatic). The ventilation system can be either vents in the roof and walls of structures, or entire transoms that open automatically.

For small greenhouses, greenhouses and greenhouses, a simple ventilation system (consisting of several vents located at different levels and open doors) is sufficient.

But for a large-sized greenhouse it is necessary to organize a special automatic ventilation system along with through blowing with several doors opening simultaneously (in automatic mode).

Such a system will be ideal for narrow and long greenhouses in which air circulation is difficult.

It is best to install a complex ventilation system in the greenhouse with special temperature and humidity sensors.

But for a small plot of land, you can design an automatic greenhouse ventilation system with your own hands using simple but reliable mechanisms.

Then all the plantings will simply die. Some people try to open the greenhouse early so that it does not have time to get too hot from the inside. Then they close it early to keep the warm air inside the greenhouse longer. eliminates the need to constantly monitor the temperature inside the greenhouse.

The system of automatic opening of greenhouse doors serves for timely ventilation. It is not always possible to open and close a greenhouse in time, so devices for automatically opening doors or vents are very popular. These devices are based on the principle of heating the contents of a container under the influence of the environment. In other words, if the greenhouse is very hot, the container placed inside will heat up. The temperature of the liquid inside the device increases. Due to the expansion of the liquid volume from heating, the opening mechanism is driven.

This is how ventilation is carried out. When the temperature in the greenhouse drops, the reverse process occurs. Ventilation of the greenhouse occurs at the moment when it is really needed.

The automatic greenhouse door opening system can be installed both on greenhouse doors and on vents. The massiveness of the structure depends on the weight of the door (window). If the greenhouse is large, then there may be several such devices.

There are several models of automatic opening devices on the market.

1. Dusya-San.
   • cost – 1530 rubles;
   • manufacturer – Belarus;
   • warranty - 1 year;
   • lifting power – up to 7 kg;
   • filler – oil.
   Provides automatic opening of vents in the greenhouse, can be installed only in one plane, since the fastenings are not equipped. The mechanism is not resistant to strong winds. Not suitable for installation on greenhouse doors due to lifting power limitations.
2. Thermal drive.
   • cost – 1500 rubles;
   • manufacturer – Denmark;
   • warranty – 10 years;
   • lifting power – up to 20 kg;
   • filler – fusible wax.
   Very easy to install and remove. Suitable for installation on greenhouse doors. Mounted in any plane due to rotating fasteners. You cannot try to close the door manually with such a device, it will simply break. Before closing the door, you need to remove the latch; to do this, the locking spring on the latch is raised slightly.
3. Ufopar.
   • manufacturer – Russia;
   • lifting power – up to 100 kg.
   • filler – oil.
   The device is a hydraulic cylinder filled with oil. The device is quite heavy, difficult to install, and responds slowly to increases and decreases in temperature in the greenhouse due to its large volume. The oil does not immediately warm up and cool down. The advantage is a large load capacity, thanks to which massive doors are held.

There are also electronic devices that allow you to control the temperature in the greenhouse. These devices are expensive, so most summer residents use hydraulic devices based on physical properties.

How to make such a door yourself

The operating principle of all hydraulic devices is the same, and the design is simple. To save money, you can create a device for opening the door in the greenhouse yourself. To make automatic opening of greenhouse doors, you will need materials that can be found at every dacha.

• 2 containers (of different sizes);
• a stopper for sealing the container (can be made from a piece of foam or rubber);
• a tube for draining liquid (plastic or metal, suitable for a dropper);
• hose.

The manufacturing process of a device for opening doors in a greenhouse:

1. To begin, we tightly fasten one of the ends of the tube to the container. Use sealant.
2. Fill the container 40% with liquid: water, antifreeze, machine oil. Oil or antifreeze is preferable, since they do not evaporate like water, and you do not have to constantly add liquid.
3. We securely secure the closed container in the greenhouse.
4. We take a second container with a smaller size. We insert a plug into it. We insert a hose into the plug through the hole. The connection must be tight.
5. Liquid is also added to this container, the level of which should be 1 cm above the cut of the tube.
6. Both containers are connected with a tube.
7. The tube connecting the containers must hang freely in any position of the door. Plants should not touch it either for the system to work.

How the device works

• When displaces liquid under pressure. When heated, it flows into another container (which has a smaller volume);
• the overflowing liquid increases the weight of the second container;
• We connect the container to the window/door using a cord. The container sinking under the weight will open the window/door.
• When the temperature inside the greenhouse decreases, the reverse process will begin.

Adjusting the automatic opening mechanism

Self-opening doors must be adjusted. This means adjustment depending on the weight of the door.

The heavier the door, the more liquid is poured into the container!

If it is very heavy, adjustment cannot be made by endlessly increasing the volume of liquid in the container. To do this, you can make the lower beam on the door heavier and control the weight by shifting the center of rotation.

Adjustment work must be carried out in warm weather!

Automatic window opening

The door to the greenhouse can be in the form of a window, horizontal. Automatic opening of greenhouse doors is carried out using a hydraulic device, regardless of the design. To ensure that the door closes tightly, a counterweight is used on the outside. Closing occurs under the weight of a counterweight.

The opening of the windows in the greenhouse must be limited with a rope, otherwise if the window is opened to the limit, it will turn over.

A homemade automatic opening system can work for years until the components wear out.

When the greenhouse has already been built and its new inhabitants are planted in it, amateur gardeners may experience annoying disappointment. Their pets in the greenhouse, instead of growing and pleasing the owner, often begin to wither, wither and get sick.

Why is it necessary to ventilate a greenhouse and how to organize it?

The thing is that simply raising the air temperature to increase plant growth is not enough. In the greenhouse you need to create the desired temperature and humidity conditions. Both temperature and humidity should not exceed comfortable values. The sun very quickly increases the air temperature in the greenhouse; on hotter days it rises to 60-70 degrees, and at the same time the humidity increases greatly. Poor plants in such an environment can simply boil. And different plants like different humidity conditions. While cucumbers and peppers tolerate high humidity well, tomatoes love drier air. The air temperature in the greenhouse should be in the range of 25-35 degrees, otherwise the greenhouse turns for its inhabitants not into a home where they are cared for, but into a torture chamber.

Manual ventilation

To lower the temperature and humidity, ventilate the greenhouse. For this purpose, special windows and two doors are usually provided. Hot air leaves the greenhouse and allows cooler air to enter. But this process needs to be monitored regularly. On normal days, the greenhouse is opened in the morning and closed in the evening. And if the weather is changeable, because it often happens: either rain or suddenly bright sun, then you have to open and close the greenhouse several times a day.

And for many summer residents, who can only come to the site on weekends, such a ventilation regime becomes impossible. In addition, even if it is possible to live at the dacha in the summer, all the same, when you go away during the day on business or to work, you are worried all day long by the thought that it will suddenly rain and suddenly become colder.

Automating greenhouse ventilation can help solve this problem. Now it is often used by those who have a greenhouse. There are different possibilities. You can buy a ready-made system. You can make it yourself. Let's look at the main automation options.

Automated ventilation

Automated ventilation can be organized in several ways. The main ones:

• automatic electronic systems;
• automatic autonomous systems.

Automatic electronic systems

Advantages:

• High level of accuracy;
• The ability to create a full cycle of plant care including watering;
• High reliability.

Flaws:

• Very high cost;
• For self-production you need appropriate knowledge;
• Dependence on electricity.

Automated electronic systems are based on the use of sensors and relays. These systems are offered ready-made, made to order, and you can do it yourself if you have certain knowledge and patience. Despite their great attractiveness, their installation is not always advisable. They are installed in farms where they purposefully grow vegetables and plants year-round. And a serious disadvantage is their dependence on electricity.

Autonomous automatic systems

These are devices that use the properties of materials to change their volume and size with changes in temperature. Thus, the physical properties of the material are used and no additional sources are required to power these systems, which is why they are called autonomous.

Main types of autonomous systems:

Advantages:

• Availability;
• Independence from power supply;
• Possibility to make it yourself.

Flaws:

• Fairly high cost;
• Manufacturing requires special skills and tools.

Autonomous systems are:

• Hydraulic;
• Two-component.

Hydraulics use the properties of gases and liquids to expand when heated. The principle of hydraulic cylinders is used. Compressed air, freon, paraffin, water, machine oil, etc. are used as expander substances.

Various types of these devices are commercially available. You can also make them yourself from purchased components or make them yourself, including using old shock absorbers. But these jobs require certain skills in working in a metal shop, being able to use welding and work with metal. In addition, in homemade oil cylinders you need to be able to accurately fit the parts so that the oil does not leak.

Two-component devices use the properties of two materials to change their length differently when heated. Use bi-metal or metal-wood. A plate made of a material that expands faster when heated becomes longer and pushes out (opens) the transom. When cooling, the reverse process occurs.

Simple automatic ventilation systems that you can make yourself

Advantages:

• Lightweight and simple to manufacture;
• Autonomy;
• Easy adjustment;
• Environmental friendliness.

Flaws:

• Relatively small carrying capacity.

But summer is already on the doorstep, hot days are approaching, and the issue of daily ventilation of the greenhouse becomes very relevant. And it needs to be solved urgently and without large additional costs. And there is such a way. There is a simple and convenient way to make greenhouse ventilation automated and autonomous. And at the same time, you don’t need to go anywhere and buy expensive components, which saves both time and money. You can make do with improvised means.

Iridescent vessels

What is especially important and pleasant is that, thanks to its simple design, it can be made by anyone who does not have any skills in plumbing. At the same time, it works reliably and does not require constant maintenance and does not require complex adjustments. All materials used in the system are completely safe to use.

It can be used on windows, both in the side walls and on the roof. The system can be left for the winter, after the winter the water thaws and everything works again. The main thing is that the tightness of the joints does not collapse.

Manufacturing

To create the system you will need:

• two containers, one large, the second small;
• connecting hose - the length depends on the distance from the expansion tank to the transom plus any free hanging;
• fitting - a small metal tube with a diameter equal to the diameter of the hose;
• sealant.

The volume of the containers depends on the weight of the transom. For small, lightweight windows, it is enough to take plastic bottles with a volume of 4-6 liters large and 1.5-2 liters small. You can use a catheter from an IV or a rubber hose as a hose. The length of the hose should be such that it hangs freely without tension in any position of the window.

The large container (expansion tank) must be hermetically sealed. To do this, you can use its own lid, just secure it with sealant. For a better and more reliable connection of the hose and containers, a fitting is inserted into the lid - a small metal tube. You can cut a thread at one end of the tube and screw it into the cap. A hose is put on the other end of the fitting. Before closing the tank, fill it with water so that ¾ of the air volume remains in the tank (for a 6 liter bottle you need to fill 1.5 liters of water) and close it tightly. All joints of the part must be carefully sealed.

The hose is connected to a small bottle in the same way. A very small hole with a diameter of 1-2mm is made at the top of the bottle for air to escape. A small amount of water is poured into the bottle so that it covers the tube inserted into the cap. Thus, the containers are connected as communicating vessels. Here it must be said that bottles can be hung upside down or upside down. But in any case, the edge of the overflow tube must be covered with water.

The expansion tank must be placed in the place where the temperature will be measured, usually under the roof of the greenhouse. And close to the window that this device will open. For better heating, the tank can be painted black or wrapped in black film. A small bottle is hung from the top of the transom frame.

Window Features.

The window itself (transom) should open around a horizontal axis in the center of the window. The axis should be slightly higher than the middle of the window in height so that the top part is slightly shorter than the bottom.

Principle of operation

Under the influence of temperature, the air in the expansion tank will begin to expand and will squeeze water into the small bottle. The weight of the bottle increases and the window will begin to open under its weight. When the outside temperature drops in the evening, the air in the tank will cool and compress. The water from the small bottle will begin to flow back, the bottle will no longer act as a weight on the transom and the window will close.

To better return the window to its original position, a small counterweight can be attached to the lower frame. For this purpose, you can use a spring or a dense rubber strip, which, when the window is opened, will be in a slightly stretched state and, when the weight of the bottle is weakened, will work as tightening the window back to its original position.

On the window frame, you need to install clamps for the maximum window opening size so that the window does not tip over.

System adjustment

The system is adjusted by selecting the volume of the container for the heated air. You can make two containers for one window. You can also choose a place for the expansion tank in that part of the greenhouse and on the side that heats up faster and the process of opening the windows was started on time. The width and speed of opening windows can be adjusted by attaching a weight to the bottom of the window and making the window open more slowly or not so widely. That is, there is the opportunity to very individually adjust the ventilation mode depending on the needs and size of the window. After observing the temperature in the greenhouse at which the windows begin to open and close, you need to adjust the system to achieve the desired indicators.

You can increase the lifting force of the system (with the same volumes of containers) and force a heavier window to open. To do this, you can attach a weight to the top of the transom. It will create more force and help the bottle open the window. Thus, using different combinations of weights, the system can be adjusted to the desired parameters.

To maintain this system, you need to add water to the bottle once every 3 weeks, because... it gradually evaporates.

Reviews from the forum:

Igor P.

“When I had a dacha, I made one like this. I could only come to the dacha once a week. I used glass jars back then. Everything worked perfectly, reacting even to temporary cloudiness. I just periodically added water to the jar.”

Victor Z.

“I assembled a system from bottles. Works. You can add machine oil to it so that the water does not evaporate so much. They say you can also pour antifreeze into it. But it’s somehow safer with water.”

Other options.

Using this same principle, the system can be designed in various ways. This makes it possible to easily adapt it to a specific greenhouse. Attach the bottle not to the frame, but tie it to a cord and throw it over a roller (reel).

This way you can get different options, even to the point that you can open windows not only with rotation around the central horizontal axis, but also around the vertical one.

You can also open windows with fastenings on the top frame and on the side.

You need to understand the principle of operation and correctly select the volume of the vessels, taking into account friction losses of the cord along the coils. You can even teach the system to open the door. The system is really very flexible.

Piston cylinder

This is a method that uses the principle of expansion of heated air.

Manufacturing:

For production you will need:

• Large capacity - expansion tank (this can be an old canister), approximate volume - 15-25 liters
• Rubber ball or volleyball tube
• A plastic cylinder with a diameter slightly larger than a ball
• Piston (can be made of any dense material, for example, dense foam)
• Metal or wooden rod
• Metal or wooden lever
• Roller (reel).

Manufacturing an expansion tank. The container can be plastic or metal. Holes are made in it for inserting the hose. It is best to insert the hose through a metal tube (fitting), which can be melted or screwed into the cap of the container. The stopper should fit tightly into the container. The joints are carefully sealed so that no air escapes.

To make a piston cylinder, you can take any thin sheet of plastic (it could be leftover polycarbonate), roll it into a pipe and make something like a tube - solder the bottom on one side of the pipe, and on the other side make a lid with a hole into which a guide for walking is inserted stock Make a piston from dense foam plastic or wood according to the size of the internal diameter of the cylinder so that it fits quite tightly to the walls, but at the same time slides smoothly along them. We attach a rod to the piston and insert it into the cylinder. The upper part of the rod rests on the lever. The connection between the rod and the lever should not be rigid, but such that the lever can slide along the top of the rod. The upper part of the rod can be in the form of a slingshot or a loop into which the lever is inserted. Or you can make a groove in the lever itself in which the top of the rod will move. It is better to make the lever in the shape of an arc. This improves the sliding trajectory and there will be less resistance in the operation of the system itself, and accordingly the useful force for opening the window will increase.

One end of the lever is fixed with a hinge to the greenhouse structure. A cord is attached to the other end, which will open the window. For proper operation of the tension cord, it is thrown over a roller (reel). The roller is placed so that it forms the position of the cord approximately perpendicular to the frame.

An implementation of this system can be seen in this video.

Principle of operation

When heated, the air in the tank expands and inflates the rubber ball, which in turn, increasing in volume, pushes the piston upward. The piston lifts the lever and this leads to tension on the cord, which opens the transom.

Adjustment of systems.

It is better to set up the system at a temperature of 15-20 degrees. First, attach the hose to the ball (ball) and inflate it. Then the second end of the hose is connected to the tank. The ball is placed in a cylinder and a piston is installed on it. The weight of the piston should be such that the ball deflates more than half. This creates compressed air in the tank and increases the lifting force of the installation.

Very important. No less than the correct sealing and strength of the covering material. Experienced gardeners often resort to automating greenhouse ventilation. This significantly saves time and effort on caring for the crop. A portable ventilation device can be assembled from scrap materials: a hydraulic cylinder or shock absorber of a car, an adjustment cylinder from a regular computer chair, and even from plastic bottles. The simplest and most reliable mechanisms can be assembled with your own hands from a shock absorber.

Engineering thought allowed greenhouse owners to breathe a sigh of relief. Now you don’t need to run to the building every time as soon as the sun starts to get hot. The thermal drive will automatically open the window for access to fresh air. Electric drives compete with these devices.

These are more complex devices with precise sensors that require fairly deep knowledge in creating electrical networks. Without power (batteries, 220V network) they will not work.

Thermal actuators for ventilating greenhouses are more autonomous. However, when making them yourself, they require high precision and painstaking care.

The principle of operation of the mechanics is simple and is based on heating the oil or other substance:

1. Any substance that actively expands when heated and contracts when cooled is suitable.
2. When heated, it pushes out the piston.
3. The piston opens the ventilation window.
4. When the air temperature drops, the piston pulls the greenhouse window back.

Thermal drive from a car shock absorber: assembly procedure

To assemble a device for ventilating greenhouses according to this scheme, you will need:

• shock absorber piston or car gas spring;
• a metal pipe a little more than 2 m in length;
• thread cutting device;
• plumbing plugs - 2 pcs.;
• bolt for brake hose with dimensions 10x1.25 (Zhiguli);
• paronite gaskets;
• oil.

The gas piston consists of:

• pneumatic support housings;
• a piston inside it;
• epoxy glue;
• stock

Diagram of hydraulic tank and hydraulic cylinder

Algorithm for assembling a thermal drive for ventilating greenhouses:

1. Prepare a couple of pieces of metal pipe. Length - 1 m each. Cut the threads and connect them with a tee. Screw regular plumbing plugs onto the free ends.
2. Remove the pin in the lower segment of the shock absorber. Make a through hole in the bottom with an 8.5 mm drill. Make a carving in this place too.
3. There is a blind hole in the middle of the bolt. Drill right through it.
4. You also need to make a 10 mm hole in the plug. Insert a bolt into it and secure it with a nut. There will still be a small section left of the bolt - screw the shock absorber thread onto it. Soften all connections using gaskets.
5. The plug itself should be screwed into the tee.

Advice. It is permissible to use a plug with internal thread. In this case, it must be connected to the tee using a drive using a lock nut.

In order for the system in the greenhouse to work, you first need to fill it with oil. Fill from one end of the pipe, having first unscrewed the plug located there. Then move the device rod to the lower position and release all excess air from the shock absorber. Return the blind screw to its place and proceed to install the drive directly in the greenhouse. You can attach it in any convenient way, even with wire. The main thing is to be reliable.

Advice. It is quite possible to attach the immovable parts of the structure directly above the planting. They can become a convenient support for tying up plants in a greenhouse.

What you need to know before using a thermostat in a greenhouse

1. In order for the rod to freely raise and lower the window, you need to make a stop for it on the frame. There is no need to screw the device tightly: you may always need to ventilate the greenhouse manually.
2. Do not install locks or other obstacles on windows or doors that will interfere with the normal operation of the device.
3. Remove the drive in the fall. Frost may damage the device.
4. Every spring, lubricate the moving parts of the structure with oil.

The thermal device is inert compared to electronics. The latter, using a temperature sensor, responds to the slightest thermal fluctuations. The oil needs time to warm up. The thicker the reacting layer, the slower the substance expands and the greenhouse window opens. To avoid mistakes, carefully study the installation sequence from the photo or video.

Automatic greenhouse ventilation: video

To maintain a stable temperature inside the greenhouse, many gardeners install an automatic greenhouse window opener. This device makes the life of an ordinary gardener much easier, since as temperatures increase or fluctuate, many greenhouse crops begin to bear fruit worse, and not every owner of a summer cottage is able to check the microclimate every hour. .

To regulate the temperature in a greenhouse or conservatory, modern models of these structures are equipped with vents or transoms located on the side or on the ceiling of the greenhouse. A window for a greenhouse is necessary for uniform ventilation and cooling of the space inside. Contrary to popular belief, an open door does not prevent growing crops from overheating because air does not circulate properly. .

Its undoubted advantage is that a well-installed and self-calibrated automatic ventilation system practically does not require the participation of the gardener, retaining the required amount of heat in the greenhouse.

In addition, the mechanisms are very simple and therefore reliable. : .

• Bimetallic, that is, consisting of two metal plates, one for fastening, the second -. As the air temperature inside the greenhouse rises, the metal of one plate expands, and the frame automatically opens the window leaf. After the air temperature drops, the metal contracts and the window falls back. This machine is suitable for small amateur greenhouses, but due to its size and low power it is not used in large-scale greenhouses, the transoms of which are made of glass, wood or other heavy materials;
• . The basis of the system is a cylinder into which a viscous liquid, for example oil or antifreeze, is pumped under pressure. As the temperature in the greenhouse rises, the liquid expands and presses on the piston, which actuates the lever that opens the window or transom. Such systems have greater power compared to bimetallic ones, and therefore are suitable for ventilating greenhouses with large doors;
• The electrical system for ventilation of greenhouses is the most advanced and expensive. It operates from the mains, and therefore can be installed even on heavy glass transoms of great length and weight. Another advantage of the ventilation system is the presence of an electronic thermometer, which means it is possible to program the closing and opening of the transom automatically when the air in the greenhouse warms up to a certain temperature.

All three systems are autonomous and do not require human intervention. .

It is necessary to install autonomous bimetallic or hydraulic systems at the top, right under the ceiling of the greenhouse, since warm air collects at the top and the temperature can be measured more accurately. – .

How to make an automatic window opener with your own hands

But, since hydraulic devices are very simple in design, many summer residents assemble them with their own hands.

• Purchase a device of a suitable model;
• Choose a suitable place in the greenhouse to install the mechanism so that ventilation is most effective;
• Based on the instructions, attach the device to the window or transom. For fastening it is necessary to use suitable screws, and if the greenhouse is made of polycarbonate, then you need to mount the machine very carefully so as not to damage the coating;
• Calibrate the system for the most effective automatic ventilation.

Factory-built systems are usually sold ready-to-use. Calibration is needed only for those mechanisms that were assembled with their own hands from scrap materials. .

New electronic sensors do not require calibration. When starting up for the first time, the owner just needs to set the operating temperature range, and then the system itself will monitor ventilation and proper air circulation. The newest models are even equipped with a fan that regulates air flow.

• Metal canister, painted black, 3-5 liters in volume, with a tight lid;
• Thin rubber hose;
• A piston, a lever and several line mounts.

To create an automatic window opener for greenhouses with your own hands, you need to:

• Insert a flexible rubber tube into the hole in the canister. Carefully coat the joint with sealant;
• A piston of suitable size is inserted into a tightly closed box, and an inflated ball placed on a rubber tube is placed under it;
• One end of the lever is attached to the wall, the other to the upper end of the piston. Here, to the free end of the lever, a fishing line is attached that opens and closes the sash;
• The canister and the box with the piston are attached to the wall of the greenhouse.

: The black-painted canister heats up as the temperature inside the greenhouse rises. The air, expanding from heat, inflates the balloon, which pushes the piston. . . This simplest pneumatic device clearly illustrates the automatic opening of windows and transoms, and independent regulation of the temperature inside the greenhouse. Similarly, the same mechanisms are used to operate more complex devices that can be purchased in stores.

Gardeners who grow the same crops for several years in a row know how temperature changes and changes in humidity affect the growth and speed of fruit ripening. If the temperature in the greenhouse is only 10 degrees higher than the recommended one, the tomatoes will become sterile, and the cucumbers will produce a huge number of leaves, but will not be able to form fruits. No less destructive is a sharp change in temperature: dew, condensation of moisture from the air, is the cause of many diseases and a significant reduction in yield. .

Automatic opening and closing of the window will help maintain a stable microclimate in the greenhouse, which will have a beneficial effect on the health of the plants and the number of fruits. And modern automatic systems that allow full control of the thermoregulation process will relieve the gardener of unnecessary worries and worries.