how does greenhouse works

The mechanism and the physical principles of the greenhouse function

Wouldn’t you agree that it makes no sense to look into buying a system without having an idea how it works (at least on the basic level)? By learning and understanding the principle of the greenhouse, you will be able to use its full capability and get the maximum benefits from it.
The most simple homemade plastic film greenhouses or complex industrial greenhouses – they all function on the basis of the same basic principles.

The principle of the greenhouse

At the heart of the functioning of the greenhouse lie simple principles of physics – thermal radiation and heat exchange. The greenhouse collects the incoming heat from the outside, turns it into heat, and keeps the warm air. That allows gardeners to keep a certain stable temperature levels inside the greenhouse, creating the most favorable environment for the growth and livelihoods of horticultural crops.
In addition, the greenhouse protects both from the effects of the external environment – for example, weather conditions such as wind, hail or snow, and from pests like beetles, locusts and domestic and wild animals that could eat or damage your plants.

Greenhouse adjacent to the building

Getting heat inside the greenhouse

The main task of the greenhouse is to utilize the thermal radiation received from the outside from the sun’s rays and / or artificial sources. Inside the walls of the greenhouse, thermal radiation turns into heat, heating the greenhouse from the inside.
This could be compared to the similar effect you could feel by closing all the windows inside the car on a hot summer day. If you do not start the engine and turn on the A/C, within only a few seconds the temperature inside your car will get significantly higher than outside and within minutes it would could get extremely hot. This is because sunlight is heating the interior of your cabin, and there is now way to get the hot air outside with your doors closed.

The materials from which the greenhouses are made also affect the ability to retain heat and regulate the temperature inside the greenhouse. For example, polycarbonate is excellent as a material for a greenhouse due to its high coefficient of thermal expansion and high thermal stability. The greenhouse is a sealed room, and this makes it impossible for the air to circulate between the inner room of the greenhouse and the environment.

The air circulation equalizes the temperature difference, which could negate the main function of the greenhouse especially during cold day. Without open air circulation and with well insulated walls, the air inside your greenhouse can quickly heat up creating ideal conditions for plant growth.


Temperature regulation in the greenhouse

Thermal radiation quickly heats the air inside the greenhouse and slowly heats up the soil. Warm air, in turn, contributes to the production and, most importantly, soil conservation of heat. Due to its organic properties, the soil is able to retain heat for a very long time, even when the source of thermal radiation becomes inactive. For example, in a simple greenhouse without heating, the soil heated by the sun in the average day keeps the heat received during the night.

But if the greenhouse is getting heated up infinitely, the temperature inside could soon become unsuitable for plants. The matter is that the function of a greenhouse promotes completely automatic thermoregulation.

According to the laws of physics, the soil heats up in the daytime due to the fact that the air temperature in the greenhouse during the day is high. At night, when the temperature of the air without sunlight drops, the soil begins to give the stored heat by heating the air. Such a simple cycle creates a constant temperature regime inside the greenhouse.

In more advanced greenhouses, additional heating means are also used, which makes it possible to control and regulate the thermoregulation without looking back at the weather. But even with heaters, the basic principle of obtaining-saving-recuperation of heat remains the same.

smart greenhouse - automated heating and cooling


Protection against external influences

Another important purpose of the greenhouse is to protect your garden crops from the adverse effects of the external environment. In this respect, greenhouses perform the same function for plants as the house – for a person. Such protection is especially important in the autumn-winter season.

The greenhouse protects:

  • From the wind, which brings dust and seeds of weeds, blows out seedlings, and a strong wind can damage the plant and even tear it from the root. Strong greenhouses with a strong hull – the only outlet for windy regions (a well-made greenhouse will withstand a small storm).
  • From precipitation. For example, by protecting plants from the rain, you yourself control how much water they will receive.
  • Most pests. You will not need to treat plants with chemicals harmful to plants and to you. Of course, it’s impossible to prevent a single bug from entering the greenhouse, if only because some harmful insects can move underground, but significantly reduce the “presence” of pests on your vegetables, the greenhouse is fully capable.

buy pvc greenhouse kit

Every agriculture enthusiasts and gardener will agree that the greenhouse is something every gardener should have. Not only it will protect your plants, it will also give ability to extend your growing season and in some regions grow year around.

Have you decided to buy a greenhouse? Choose the right model in ClimaPod Greenhouse online-store here.

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