Ven­ti­la­tion in a green­house is not a fad, but a neces­si­ty, because the cor­rect tem­per­a­ture regime plays one of the most impor­tant roles in the suc­cess­ful cul­ti­va­tion of var­i­ous crops.

Water­ing, loos­en­ing the soil and time­ly exter­mi­na­tion of weeds are no less impor­tant, but the green­house effect that occurs when moist air is heat­ed can destroy an unripe crop in a mat­ter of hours. Warm and humid air is an ide­al micro­cli­mate for the devel­op­ment of most fun­gal dis­eases, and also makes it pos­si­ble for an unlim­it­ed amount of path­o­gen­ic microflo­ra to devel­op in the soil.


To avoid these con­se­quences that are detri­men­tal to the crop, time­ly ven­ti­la­tion of green­hous­es is nec­es­sary, which will reduce the tem­per­a­ture and humid­i­ty of the air inside the struc­ture. Also, when air­ing, fresh air enters, which is essen­tial for good plant growth.

The easiest way to ventilate greenhouses

The sim­plest and most inex­pen­sive way is to man­u­al­ly ven­ti­late green­hous­es. Each green­house struc­tural­ly has dif­fer­ent win­dows and tran­soms. By installing a ther­mome­ter and a hygrom­e­ter in the build­ing, you your­self, based on their read­ings, will be able to open or cov­er the tran­soms, cre­at­ing nat­ur­al sup­ply and exhaust ven­ti­la­tion in the green­house.

By inde­pen­dent­ly adjust­ing the num­ber and area of ​​​​open­ings, you can quite effec­tive­ly ven­ti­late the green­house, focus­ing on the direc­tion of the wind and the exter­nal air tem­per­a­ture. Like every­thing, man­u­al ven­ti­la­tion has its advan­tages and dis­ad­van­tages. The main advan­tage of this method is its low cost. You do not need to buy devices, but you can focus on your expe­ri­ence.

Independently open and close windows and doors when the temperature changesAny­one who has grown plants in a green­house at least once knows that one has to open and close the win­dows a dozen times a day. And here you can’t “break away” from this les­son. And there can be no ques­tion of leav­ing.

Automatic ventilation

Using the expe­ri­ence of sum­mer res­i­dents and sim­ple devices, you can eas­i­ly arrange nat­ur­al ven­ti­la­tion in auto­mat­ic mode. How good is automa­tion? Yes to every­one: you will not eas­i­ly cre­ate the nec­es­sary con­di­tions for the growth of plants, but you will also make sure that the ven­ti­la­tion is car­ried out depend­ing on the crop that you will grow in the green­house. And it is espe­cial­ly pleas­ant that the sys­tem will prac­ti­cal­ly not need to be mon­i­tored.

To date, there are four ways to auto­mate the ven­ti­la­tion of green­hous­es:

  1. Using elec­tri­cal equip­ment and sys­tems for ven­ti­la­tion.
  2. By installing hydraulic ven­ti­la­tion automa­tion sys­tems in the green­house.
  3. Mount­ing bimetal­lic ven­ti­la­tion sys­tems.
  4. Inte­grat­ing auto­mat­ed vents into the design of the green­house.

Electrical devices for automatic ventilation

The sim­plest auto­mat­ic device for arrang­ing a green­house with nat­ur­al exhaust ven­ti­la­tion is a ther­mo­stat with a fan con­nect­ed to it. The prin­ci­ple of oper­a­tion of this sim­ple mech­a­nism is as fol­lows: when the tem­per­a­ture ris­es, the relay is acti­vat­ed and starts the exhaust fan. It will cre­ate a small vac­u­um and suck out heat­ed air from the struc­ture, and fresh air will flow in its place, through nat­ur­al leaks in the green­house struc­ture.

If you pro­vide for the auto­mat­ic open­ing of the win­dow at the oppo­site end of the green­house when the fan is turned on, then you can make more effi­cient ven­ti­la­tion. The fan will dri­ve cool air into the build­ing and low­er the tem­per­a­ture and humid­i­ty in the green­house much faster.

Exhaust fan for polycarbonate greenhouseThis ven­ti­la­tion design allows you to quite accu­rate­ly set the para­me­ters for turn­ing on and off the equip­ment. Hav­ing some­what com­pli­cat­ed the design, you can con­fig­ure the fan so that it cre­ates a cer­tain force of air flow depend­ing on the tem­per­a­ture inside the green­house.

But such a sim­ple and effec­tive design is not with­out draw­backs. First and fore­most is the depen­dence on elec­tric­i­ty. The sec­ond dis­ad­van­tage of elec­tri­cal equip­ment for ven­ti­la­tion sys­tems is the com­plex instal­la­tion of dri­ves for auto­mat­i­cal­ly open­ing or clos­ing ven­ti­la­tion tran­soms. Many will say that such sys­tems are reli­able and when estab­lish­ing alter­na­tive sources of elec­tric­i­ty, depen­dence on a sud­den black­out dis­ap­pears.

They will say — and it will turn out to be right, but solar pan­els, as an alter­na­tive pow­er source, are expen­sive and have a rather low effi­cien­cy, and a wind gen­er­a­tor occu­pies a large area, is expen­sive and requires wind. Based on the fore­go­ing, such devices can­not be con­sid­ered as a com­plete replace­ment for the elec­tri­cal net­work.

Hydraulic ventilation automation systems

This inge­nious inven­tion oper­ates on the prin­ci­ple of com­mu­ni­cat­ing ves­sels, one of which is locat­ed in the green­house and is con­nect­ed to a sys­tem of levers and a tran­som. The sec­ond ves­sel is installed on the out­side of the green­house and is con­nect­ed to the first hose. That’s the whole struc­ture. The sys­tem works like this: when the tem­per­a­ture ris­es, it affects the liq­uid inside the ves­sel locat­ed in the green­house, it expands and opens the win­dow through the sys­tem of levers. The con­tain­er, locat­ed on the out­side of the struc­ture, com­pen­sates for the pres­sure, slow­ing down the sharp open­ing of the win­dow. As the tem­per­a­ture drops, it also affects the liq­uid and every­thing hap­pens in the reverse order.

Such automa­tion of ven­ti­la­tion cre­ates effec­tive nat­ur­al ven­ti­la­tion of the green­house, which is suf­fi­cient to main­tain the desired tem­per­a­ture bal­ance. In addi­tion, the advan­tage of the sys­tem is com­plete ener­gy inde­pen­dence and the almost com­plete absence of the need for con­stant super­vi­sion.

But even here it was not with­out draw­backs, the main of which is the slow open­ing and clos­ing of the ven­ti­la­tion win­dows. The fact is that with a sharp increase in tem­per­a­ture, the iner­tia of the mech­a­nism can play a trick on you, which will lead to over­heat­ing of the air and the death of the crop.

How to choose a hydraulic mechanism for arranging ventilation

Para­dox­i­cal­ly, despite the rather seri­ous short­com­ings of hydraulic ven­ti­la­tion sys­tems, there is an increased demand for them from gar­den­ers. And demand cre­ates sup­ply, so there are a myr­i­ad of options for such devices from dif­fer­ent man­u­fac­tur­ers. What fac­tors to look for when choos­ing this unit?

  • Price cat­e­go­ry. Effi­cient hydraulic devices cost a lot. Their price varies from 1.5 thou­sand rubles. up to 3.5 thou­sand rubles for one piece. And they are need­ed for each win­dow.
  • Each such unit is designed to lift a win­dow of a cer­tain weight, so before buy­ing the mod­el you like, ask the sell­er how much it can lift and whether it has enough pow­er to lift the win­dow of your green­house.
  • The hydraulic lift has a cer­tain mass, so imme­di­ate­ly decide how many kilo­grams your green­house struc­ture can with­stand.
  • Anoth­er impor­tant fac­tor to be deter­mined before buy­ing this device is whether it can be con­fig­ured to oper­ate at a cer­tain tem­per­a­ture.

If you imme­di­ate­ly deter­mine which device you need before buy­ing, then the effi­cien­cy of its work is guar­an­teed to you.

Mas­ter’s advice:
Each hydraulic open­er has a spe­cif­ic open­ing angle. When buy­ing, pay spe­cial atten­tion to this.

Mak­ing ven­ti­la­tion with the help of such a device is very sim­ple and not finan­cial­ly expen­sive. The win­dow open­ing mech­a­nism con­sists of a lever and two bimetal­lic plates, which have dif­fer­ent expan­sion coef­fi­cients. In sim­ple terms, it works like this: when the tem­per­a­ture ris­es, one of the plates bends, and push­ing the lever opens the win­dow. When the tem­per­a­ture drops, the plate returns to its orig­i­nal posi­tion and the win­dow clos­es.

Sim­ple, cheap, cheer­ful, but not with­out flaws. In such a sys­tem, it is dif­fi­cult to cal­cu­late the cor­re­spon­dence of plate buck­ling to a cer­tain tem­per­a­ture.

Air vents for automatically ventilating the greenhouse

This is a new trend in the arrange­ment of auto­mat­ic nat­ur­al ven­ti­la­tion in green­hous­es. The auto­mat­ic win­dow leaf con­sists of an oil cylin­der and a pis­ton, which acts as a tran­som push­er. When heat­ed, the oil in the cylin­der expands and push­es out the pis­ton, which opens the tran­som. With “exact­ly the oppo­site” every­thing hap­pens when the tem­per­a­ture drops. Since we know from the physics course that oil can­not be com­pressed, the push­er pis­ton can lift quite a seri­ous weight.

A won­der­ful and effec­tive inven­tion, and most impor­tant­ly — afford­able. A sim­ple device to install, it will per­fect­ly replace the some­what out­dat­ed, but effec­tive auto­mat­ic sup­ply ven­ti­la­tion.

If you’re a fan of grow­ing ear­ly fresh veg­eta­bles or flow­ers, then get seri­ous about build­ing a ven­ti­la­tion sys­tem in your green­house, which is essen­tial for grow­ing most crops.

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