Industrial greenhouses usually equipped with special ventilation systems, and small greenhouses in suburban areas replace them with conventional ventilation. If in summer the access of the freshest air to the greenhouses is done almost all the time, then the colder it is outside, the more strictly it is necessary to watch the opening of the windows and the air temperature in the greenhouse. For this purpose, special machines are made.

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The most common in installation and operation are electronic automatic devices for opening window leaves. They consist of a temperature sensor and an electric motor. As the temperature rises to the indicated level, the sensor activates the engine, which sets the window in motion. When the temperature drops to a suitable level, a reverse process occurs. The only disadvantage of such a device is the requirement for a constant power supply, not all greenhouses are provided with it.

Do-it-yourself automatic window for a greenhouse

Reviews:

Galina Dovgan

Galina Dovgan writes: the piston from what? how many liters of oil? is there air in the tank? thanks

More harmoniously, thermal actuators fit into the design of greenhouses made of cellular polycarbonate. The vents made of this material are quite light, so that even a home-made device can control them. At the same time, polycarbonate is quite reliable, so that it can be used to make a strong window, applicable for repeated opening and closing cycles.

The advantages of electronic drives include high power and the ability to create programmable mental systems that include a huge number of a wide variety of sensors and allow you to most correctly determine the ventilation mode of the greenhouse.

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At normal temperature inside the greenhouse, the hydraulic cylinder rod is retracted, and the window is closed. When the temperature rises, the body of the hydraulic cylinder heats up and transfers heat to the oil, which expands and extends the rod, which slowly pushes the window usually upwards, so that it opens smoothly

To make a hydraulic receiver from a steel pipe, turning and sealed, preferably gas, welding will be required. With a hydraulic cylinder working volume of 15 ml, a hydraulic receiver volume of about 600 ml is needed, which corresponds to a pipe with a diameter of 40 mm and a length of 400 mm.

To make a device for opening the vents, you will need minimal costs. It can be a hydraulic system, in which ordinary plastic bottles work. There are many of them in any home. The service life of this design is more than 3 years.

The window leaf itself can be installed vertically on the side surface of the wall. In some embodiments, self-opening transoms cut horizontally into the roof of a polycarbonate greenhouse. The smaller bottle is fixed on the upper, lighter part of the window. As the pusher acts on the working fluid, the window will begin to swing open.

Do-it-yourself hydraulic automatic window opener for greenhouses makes it simple, in fact, these are 2 containers filled with liquid, connected by a hose. The flask from below is sealed and partially filled with air, the other compartment is filled with air, it plays the role of a thermostat. The flask at the top is a weighting agent. The sun is hot, the temperature in the greenhouses is rising, the air in the first flask expands, displacing the liquid, which flows through the hose into the upper container, it fills up, gets heavier, the window opens. The air cools - the opposite effect occurs.

We visually mark the greenhouse in height into 3 parts, at the very top we will install a window. We examine the frame, the openings should be located between the supporting elements. For example, a window for an arched greenhouse will be ergonomic and convenient if it is arranged between the upper and the next lower crossbar, under the highest point of the arc.

I had another problem, when heated, the rod was extended to the end, under very high pressure and with further heating, there was nowhere for the oil to expand, it began to tear the tank. Therefore, I had to introduce an air bubble into the tank to compensate for the expansion. Try it, you will succeed.

Well thought out. Well, everything is done very simply and neatly. There are actually a couple of questions. Do you need to wash the mechanism for each window or is one enough for everything? and second, does the wind blow open windows? Why barrels 3 l? after all, its volume does not play a role for the output of the cylinder, except that the less working fluid, the more sensitive the mechanism will be, but this is not necessary?

Editor Greenhouses and greenhouses 16772

The main purpose of building a polycarbonate greenhouse with your own hands is to provide plants with heat, which allows you to grow them when the weather is not favorable outside the walls of the structure. Plants react poorly to both high and low temperatures. Timely open windows in a polycarbonate greenhouse and elementary ventilation will help protect them from such negativity. But the rhythm of modern life does not allow us to sit near the windows and wait when we need to open or close them.

The automation used for this purpose makes it possible not to constantly monitor these operations. For example, a thermal drive automatically opens the vents when the temperature rises, and closes them when it drops. That is why home craftsmen are trying to figure out how to make ventilation in a polycarbonate greenhouse automatic. After all, it is enough to make and install the same thermal drive with your own hands only once in order to avoid many problems in the future, and even reduce watering of plants.

What to prefer thermal drive or electronics?

It is worth noting that a conventional thermal actuator has one significant drawback, it reacts too slowly to a change temperature regime in a greenhouse. So with a sharp change in it, you have to carry out manual ventilation, and sometimes urgent watering to save the plants from the heat. But using, for example, an electric thermal actuator, it is possible to open the transom within one minute. But this option also has a drawback, which lies in the fact that when using it, it should be possible to connect such a thermal actuator to the mains, and it is quite difficult to install such a system with your own hands without special skills.

But when choosing an acceptable automatic device for greenhouses built of polycarbonate, you need to take into account that although the oil thermal actuator works too slowly, it is much more reliable than various kinds of electronics. And in order to speed up the heating of the oil poured into the thermal actuator, you can, for example, think about how to reduce its thickness. This can be achieved if you decide to assemble a thermal drive with your own hands, use an automobile gas shock absorber or a cylinder from an office chair as a container.

How to assemble a simple hydraulic machine

For a do-it-yourself vent, which could function as a hydraulic machine, the knowledge of physics obtained at school is enough. The simplest machine that allows you to organize ventilation is a device that works on the principle of hydraulics. It is not difficult to make and assemble such a machine with your own hands. The principle of its work is as follows:

• when the sun's rays begin to heat a hermetically sealed large container suspended in the upper part of the greenhouse, where, as a rule, it is especially hot, from its heat, the liquid in it will also begin to heat up;
• under the pressure that it will create by its expansion when heated, the liquid will flow into a smaller container;
• under the weight of a heavy small container, a gradual opening of the window will begin;
• as soon as a gradual cooling of the air occurs inside the polycarbonate greenhouse after sufficient ventilation, everything will be repeated in the reverse order.

The most pleasant thing in this matter can be considered that it is possible to make such a device that provides an automatic method of ventilation with minimal cost. For example, a mechanism made by its crayfish from plastic bottles can serve as a similar hydraulic system. This material can be found in every home in a considerable amount. Moreover, such a simple system will last for three years, without any diagnostics.

So, when creating a system that will allow automatic ventilation of the greenhouse, the following will be used:

• a large five-liter plastic bottle, which can be wrapped in black plastic wrap to increase efficiency, thanks to this wrapping, the temperature in it can rise to about 80 degrees;
• a small plastic bottle of 1.5 liters;
• rubber stoppers for hermetic closing of bottles;
• it is more convenient to connect the bottles with a tube from a medical dropper, the ends of which are easy to insert into rubber stoppers. For successful work of the system, it is necessary to ensure its complete tightness, so the tubes should be fixed with hot-melt adhesive, but on the condition that free communication is maintained between the bottles through the tube.

There are several ways to fix the window with your own hands: vertically on the edge on the wall or horizontally in the roof of a polycarbonate greenhouse. It is advisable to think about making the bottom of the window a little heavier than the rest of the structural elements, then it will slam itself under the weight of its own weight. A smaller plastic bottle must be fixed on the lightened part of the window so that it provokes the opening of the window with its increasing weight from the moment when water begins to flow into it.

For hanging bottles, the necks should be at the bottom. To ensure the necessary ventilation with the bottle system, you need to try to correctly determine the temperature at which it will function properly, as well as the height of the large container, because the higher it can be hung, the sooner the automation will work and the sooner the ventilation will begin. The proposed hydraulic mechanism will make it possible to set up automatic opening of a window in a greenhouse weighing 4-5 kg.

Such simple devices have been able to prove themselves well in the greenhouses of many gardeners and are widely used by them in personal plots.

Although the word "greenhouse" comes from "warmth", overheating the plants in it is much more dangerous than cooling them down. That is why elementary ventilation of the greenhouse is so necessary, which drives stagnant air, regulates humidity (which is especially important for tomatoes and cucumbers) and hardens seedlings. True, not everyone wants to run several times a day to raise and close the windows. And therefore, someone attaches a mother-in-law with a pole for this business, and someone makes automatic vents for greenhouses with their own hands. Everything is quite simple in fact: a little school knowledge of physics, good schemes and our advice - and a self-made automatic window will give odds to any expensive store.

How to make a small hydraulic machine?

The hydraulic automatic window for the greenhouse is a simple and understandable device even for a child. Of course, it will not be able to raise the roof of the greenhouse, but it will successfully open a window of almost any size and weight. The device itself is quite simple both in manufacturing and assembly.

How it works? That's how. A sealed metal container from heating by direct sunlight will begin to transfer its heat inside, air and liquid. Expanding, the liquid will create pressure inside the container, and thus flow into another smaller container - a liter jar. Under the weight of the jar, the leaf of the window will begin to descend through the block, transferring force to it at the point of attachment of the bowstring. As soon as the air cools inside the greenhouse, the reverse process will occur.

And the best part is that such a device is made for automatic ventilation with a minimum of costs. So, in the course will go:

• empty metal four-liter container from under automobile oil;
• cork made of dense foam or rubber (you can also use metal, specially ordered from a familiar welder) for hermetic closing;
• tubes for transfusion of liquid, which can be plastic or aluminum. The length of each must be calculated so that it is easy to put on a flexible and thin rubber hose from the outside, and inside it could not touch the bottom of the container. The tubes themselves can either be soldered to the container, or threaded and secured with two nuts - then the tube should be shorter, but then it must be in the liquid.

So, here is the process of making an automatic window for a greenhouse:

Step 1. Insert a tube into the prepared empty sealed container.

Step 2. The container is filled with liquid by about 40%. Antifreeze, water, and even automotive waste oil can be used as a liquid.

Step 3. The filler neck must be tightly closed and firmly fixed on the upper crossbar of the greenhouse - as it is convenient.

Step 4. In a small container, it is also necessary to insert a tube, and drill a hole with a diameter of 2-4 mm in the lid. By the way, the smaller the hole, the less the liquid will evaporate later.

Step 5 Liquid is poured through the pipe a little higher than the level of overlap of the lower opening of the pipe - about 1 cm.

Step 6. Now you need to fix the seam that connects the small container and the desired point of the transom with the help of a bowstring.

Step 7 Using a soft rubber hose, the containers are connected into one system.

It remains now only to configure the ventilation device. This should be done only at normal temperature, when the window is closed. Through trial and error, it is necessary to adjust the machine, while balancing the force of opening the window itself with the weight of the liquid filled with it. But in order to be able to automatically open heavier vents, it is necessary to increase the weight of the jar with another load, while not changing the existing ratio of the poured liquid.

By the way, if the load is chosen correctly, then it will be easy to open quite massive vents with the help of the whole structure. And in order for the window itself to close under its own weight, its lower bar must be made heavier than the upper one or the center of rotation must be shifted from the middle by 5 cm upwards.

In general, the automatic opening of the window in the greenhouse can be the most different options, and the above example is simply the most convenient. The main thing is not to forget to pour a little machine oil into the container every 20 days - it is necessary to reduce the evaporation of the liquid.

But, if a personal greenhouse is by no means small in size, it will be problematic to ventilate it with only one window. After all, on hot days it is important that the cooler air outside gets in quickly enough, and the temperature inside does not go off scale. And for this, you already need to open at least a frame with an area of ​​5 square meters. And for this purpose, according to the principle described above, it is also possible to make a more serious hydraulic ventilation system with your own hands, spending no more than 2000 rubles on everything. Simply, the container needs to be found through more acquaintances, and the hydraulic cylinder from the aircraft landing gear is ideal in this regard. As a result, the entire design of the automatic ventilator will turn out to be about 100 kg, but it will work properly for many years, without requiring any special trouble.

The easiest machine for small designs

For very small greenhouses, you can make an extremely primitive, but reliable device for automatically closing and opening windows. It will be a simple hydraulic cylinder that works great on the most ordinary machine oil, even dirty. And it works accurately and efficiently. To do this, it is necessary to pour 800-1000 g of oil into it and put it under the roof of a greenhouse or greenhouse. As soon as the air temperature in the greenhouse begins to rise from 20° to 35°, the piston will easily lift a part of the roof of the greenhouse above it by all 15 cm, which can weigh up to 10 kg. Those. no problem on hot days, 2-3 frames connected together will rise. And it is easy to make such a hydraulic cylinder - the main thing is that oil does not leak between the walls and the piston of the structure, but the piston does not move too tight. But in general, the operation of such a hydraulic cylinder is trouble-free - as soon as the temperature inside the greenhouse begins to rise, the frames will immediately open a little, as soon as clouds come in, they will close.

Automatic window vent with plastic bottles

A simple automatic ventilation system has also proven itself well today, for which all you need is a couple of used plastic soda bottles. But such a system works surprisingly well and has long been tested in more than one greenhouse. So here's what to do.

Step 1. Making parts

To build this unusual system, you will need plastic bottles 1.5 liters and 6 liters. In their covers, you need to install fittings for a thin tube from a medical dropper. You can also glue the details of the dropper to the lids using eloxide. The main thing is that two bottles then freely communicate with each other through this tube.

Step 2. Window design

In a greenhouse or a small greenhouse, you need to make a dormer-type window, where the axis will fall in the middle of the frame. The underside of such a window should be made a little heavier so that then the entire window closes under its own weight. And you can mount it horizontally on the roof of the greenhouse, and vertically on the end wall - here it will be more convenient. But on the lighter and shorter upper part of the window you need to hang a small bottle - it will open the window as soon as water from the larger one enters it.

Step 3: Hanging bottles

Hang the bottles with the holes down. Pour 1 liter of water into a large one and screw on the lid. And in the small one - make a small slot near the bottom so that the air comes out and enters freely.

Step 4. Adjustment of the window opening temperature point

To adjust the temperature point at which the opening of the window works, it is necessary to determine the height of the suspension of a large bottle - the higher it is, the earlier the window will open. In addition, you can initially create pressure in a 6-liter bottle by turning it empty with a cap with a hole up, pouring water through a small bottle and hanging it up again with a hole down.

During the day, a 6-liter bottle will begin to heat up, the air in it will expand in volume and displace water into a small one. The water in the small bottle will exceed the weight of the heavier one, the window will open, and in the evening, when it becomes cooler, the large bottle will cool down and suck in the water from the small one, due to which the window will close under its own weight. The most important thing is that the tube connecting the bottles always hangs freely, regardless of the position of the window, and growing plants (especially cucumbers) do not touch it.

These simple methods were invented by our compatriots and successfully tested on their greenhouses.

Many summer residents make a lot of efforts to get the best crop of crops grown in a greenhouse. To do this, everything must be taken into account. There are no trifles in this case. To ensure optimal ventilation, install an automatic window opener for the greenhouse. It will facilitate the work of farmers, as it will save them from constant monitoring of the level of humidity and temperature inside the greenhouse. What types of greenhouse window openers are available for sale? How to do, install such a device with your own hands? Let's talk about this in more detail.

The need for application

The greenhouse window opener is a fairly simple device. It gives its owners a lot of advantages. Maintenance of the greenhouse complex will be much easier.

For each culture, it is important to withstand certain conditions. Automatic ventilation will create the most favorable microclimate inside the greenhouse for those plants that are now grown in it. A properly installed and well-thought-out ventilation system will not only increase productivity, but also make life easier for the owners of the greenhouse. After all, they no longer need to carefully monitor the conditions inside it. There are 4 main types of such devices on sale, which are distinguished by the type of devices. In order to properly mount or make such a device yourself, you need to familiarize yourself with the most common of them.

electrical system

Automatic machines for opening greenhouse windows in automatic mode, according to the type of operation, are divided into mechanical and electrical. Both varieties have their advantages and disadvantages. For example, to automatically open the greenhouse windows, it reacts to temperature changes in the greenhouse or simply works in timer mode. Now there are such controllers that can be programmed and controlled using the Internet. The advantages of electric automatic machines for opening the end, side windows for the greenhouse include manufacturability, compactness and efficiency. They have great power.

The main disadvantage is the dependence on electricity. If there is a power failure in the machine, all plants may die. Therefore, they usually purchase a spare power unit. Also, the repair of such devices is quite expensive.

mechanical types

There are three types of greenhouse mechanisms. The automatic window opener horizontal or vertical can use the principle of linear expansion of metals under the influence of temperature. These are bimetallic systems, in the manufacture of which two different metals are used. For such devices it is very difficult to correctly set the required level of heat in the greenhouse.

It is quite simple to assemble the machine for the hydraulic opening of the greenhouse window on your own (for example, "Dusya-San" or "Will"). It does not depend on electricity, does not emit foreign odors. Instead, it creates coziness and comfort inside the greenhouse. The disadvantages of such systems include a large inertia, high cost, as well as temperature control only at the installation sites. The last variety is pneumatic mechanisms. They are based on the principle of accounting for thermal energy. They are easiest to make yourself. They are quite bulky and depend on the pressure in the atmosphere, but their cost is the lowest with absolute energy independence.

Types of organization of automatic ventilation

There are several ways in which you can organize automatic ventilation of the greenhouse. This must be taken into account when creating ideal conditions for plants inside the greenhouse. If the structure is quite large, ventilation should be carried out through 2 vents that are next to each other. In the case when the greenhouse has an elongated shape, an automatic machine is used to open the end window of the greenhouse. This is through blowing. Both doors open automatically.

You can use the machine for window vents in the wall, which have special devices. The windows are at different heights. The most accurate ventilation systems use temperature and humidity sensors. It is also possible to do it yourself.

Manufacturers overview

Today they are very popular automatic systems ventilation of a domestic manufacturer. Their cost is lower than foreign ones, and the functionality and quality are in no way inferior to them.

The automatic window opener for greenhouses "Dusya-San" is very popular among summer residents. It maintains the temperature inside the greenhouse at +16 - +25 degrees. It is applied to window leaves weighing up to 7 kg. For a more powerful opening of doors and windows, Ufopar products are used (reinforcement on the stem reaches 100 kg), Tuymazy (the sash rises to a height of up to 40 cm), Termovent (opening up to 45 cm upwards). Some manufacturers have resorted to a little trick. For example, the Volya greenhouse window opener is designed exclusively for the designs of this manufacturer. This should be taken into account when purchasing such a product.

Do-it-yourself machine

There are techniques proven by experienced gardeners that ensure high-quality ventilation of the greenhouse. The principle of operation of such devices is clear.

Do-it-yourself automatic window opener for greenhouses is quite simple to make. For this, a sealed metal container is used. It transfers heat from the heating of the sun's rays inside. There are air and liquid. The substance creates pressure inside the container when expanding. Thus, the liquid flows into a liter jar. Under its weight, the window will fall. This procedure occurs through a block that transmits force at the point of attachment of the twine. When it becomes cool enough inside the greenhouse, the process will stop and go to reverse side. The production of the system will require a minimum of resources.

A few secrets

Do-it-yourself window opener for greenhouses is made according to a certain scheme. To do this, a tube is inserted into a pre-prepared container (empty and sealed). Through it, liquid is transferred to the vessel, which should fill 40% of the internal volume. It can be water, antifreeze or used engine oil. After filling the container, it is tightly closed and fixed firmly on the upper crossbar of the greenhouse.

In a liter jar, a hole is drilled in the lid into which a tube is inserted. Better to keep it small. So the liquid will evaporate less subsequently. Water or oil is poured through the tube. The level should be 1 cm higher than the border of the blocked lower opening of the tribe. Then a seam is fixed, connecting the small container with a twine and the correctly selected point of the transom. Both containers are connected to single system with a flexible hose.

Setting

After installation, the greenhouse window opener should be set at normal temperature and the greenhouse sash closed. Here the procedure requires the use of trial and error for the right balance.

If the window is too heavy, then the structure should be reinforced with the weight of the jar. The ratio of the poured liquid does not change. If you find the right balance, using this method, you can also open rather bulky windows. They will close under their own weight. To do this, the lower bar of the frame must be heavier than the upper.

After familiarizing yourself with such a device as an automatic machine for opening a greenhouse window, you can purchase the most suitable option or make a similar system with your own hands. Given all the conditions that are inherent in a particular greenhouse, you can create ideal conditions for a variety of types of crops.

The technology of growing plants in closed ground provides for the formation of a special microclimate in the premises. And one of the devices that ensure that all parameters are maintained at the proper level is an automatic window opener for greenhouses. This device contributes to the most efficient ventilation, and also normalizes the temperature and humidity conditions.

Today, there are many modifications of such devices, ranging from the most primitive handicraft levers to factory thermal actuators. Below we will consider the principles by which they function, and describe how to make an automatic window in the greenhouse on your own.

Greenhouse ventilation basics

Why are vents needed?

In the presence of high-quality heating and airtight glazing, it is quite simple to choose the optimal temperature regime and air humidity in the greenhouse. However, the main difficulty lies in maintaining all parameters at a certain level, because the composition of the air, its moisture content and temperature are influenced by both external and internal factors.

At the same time, we should not forget that different plants require different growing conditions, which also complicates our task. Partially, thermostats on heating appliances help to cope with this problem, but sometimes they are not enough.

Note! An increase in temperature by 10 0 C significantly accelerates plant growth. At the same time, as soon as the temperature rises to 38-40 0 C, most crops begin to wither, and soon die. This explains the need for strict control of the microclimate.

The easiest way to normalize the climate in a greenhouse is periodic ventilation. Naturally, in summer time air must be supplied to the greenhouse almost constantly, while in autumn, winter or early spring, the influx from outside must be strictly dosed.

To ensure ventilation in industrial greenhouses and greenhouses, entire ventilation systems are installed. For a private house, such costs will be unbearable, so you just have to make small windows in the walls and roofs.

A vent is an opening in a wall or roof slope that is closed by a sash. As a rule, they are made frame, which minimizes heat loss through the slots around the perimeter.

Most in a simple way temperature and humidity control is manual ventilation. However, this process is very time-consuming (especially if the greenhouse is located in a remote country house), therefore, automatic opening of the window in the greenhouse is actively used today.

Technology overview

To date, there are several technologies that allow you to control ventilation when growing plants in closed ground.

The most requested are:

• Electrical devices. They are the easiest to install, and therefore quite often used by novice gardeners. The basis of such a device is a temperature sensor located indoors. As soon as the parameters reach the desired values, the sensor activates the electric motor, and it either starts the fan or sets the window leaf in motion.
• A significant disadvantage of this solution is its dependence on a constant power supply. A power outage for several hours can put an end to the entire crop.

Note! You can, of course, supply each greenhouse with an uninterruptible power supply, but then you will need to purchase sufficiently energy-intensive models. And their price, frankly, is rather big!

• Hydraulic technology. The operation of such devices is based on the principle of expansion of a liquid when heated. Hydraulic levers, which provide automatic opening of the side windows in the greenhouse, are simple and reliable. In principle, there is simply nothing to break there: containers filled with liquid are located inside, and when the temperature rises, the hydraulic mechanism simply raises the transom.
• The disadvantage of such devices lies in the high inertia of the system: when the temperature drops, the sash does not return to its place immediately, and there is a risk of plants freezing.
• Compact factory ventilators work on the same principle, only oil is used instead of water in the tanks.

• Bimetal devices can also be used to provide ventilation. The principle of operation of the bimetallic lever is based on the unequal expansion of different metals with increasing temperature. The bimetallic pair installed inside the opening device reacts to changes in the temperature regime, and when a certain level of heating is reached, it lifts the transom sash on the roof.
• The main disadvantage of bimetallic devices lies in their low power: they cannot cope with heavy glass doors, therefore automatic windows for polycarbonate greenhouses are often adjusted with their help.

Ventilator installation

factory devices

On the market today you can find many modifications of devices that serve to automatically open windows and transoms in greenhouses.

However, most of them are designed according to a single principle:

• The basis of the system is a hydraulic cylinder. The volume of the cylinder can be different, since it is he who largely determines the power of the system, i.e. maximum opening weight.

• Inside the cylinder is oil or paraffin, which ensure the operation of the device when the temperature changes.
• A movable rod is fixed at one of the ends of the structure.

The device is installed as follows:

• Base with or on the window frame.
• We attach the stem to the leaf of the window in such a way that when it is fully extended, the window opens by about 30-40 cm.
• We fix the sash with safety chains or canvas tapes to avoid damage to the mechanism during gusts of wind.

Advice! For more accurate operation of the system, close the hydraulic cylinder housing with a sun screen. So the automation will only respond to the internal temperature of the greenhouse, and not to heating from direct sunlight.

The device works very simply: when the internal temperature rises, the oil or paraffin expands, and the stem pushes the window out. Cool air enters through the open sash, the temperature gradually decreases and the stem returns to its place.

Homemade designs

Quite popular among gardeners is also a self-made hydraulic automatic window for a greenhouse: you can literally assemble it with your own hands from improvised materials, and it works a little worse than branded models.

Handicraft construction: 1 - counterweight, 2 - sash, 3 - retainer, 4 - mount

This device is made like this:

• Pour 0.8 - 1 liter of water into a three-liter jar and roll it up with a lid. We insert a thin (5-7 mm) copper tube into the lid and solder the connection for complete tightness. The tube should not reach the bottom by a few millimeters.
• We put a flexible rubber or PVC hose of the appropriate diameter on the copper tube.
• We connect the hose with a jar with a volume of 0.8 - 1 l through a polyethylene lid.

Do-it-yourself similar automatic vents for greenhouses are assembled according to the following scheme:

• We fix the vent leaf in the frame on a rotating central axis.
• We hang a small jar from the top of the sash, and balance the bottom with a bar - a counterweight.
• We fix a large jar under the ceiling of the greenhouse.

Now, when the temperature rises, water from a large can will flow into a small one, and with its own weight, the sash will turn on the axial mount. Closing the window occurs in the reverse order.

Despite the apparent simplicity, such a device works almost flawlessly. The instruction manual recommends only monitoring the water level in the system, and topping up if necessary.

Output

Whatever technology you choose, in any case, pretty soon you will be able to make sure that the automatic opening of the window in the greenhouse saves you a lot of time (