How does an artificial greenhouse works? Explain in brief.
Answers
Answer:
Artificial green house,
Explanation:
Greenhouses create a sheltered environment for plants by using solar radiation to trap heat. This system of heating and circulating air helps to create an artificial environment in a greenhouse that can sustain plants when the outdoor temperature is too cool or variable.
Explanation:
Greenhouses create a sheltered environment for plants by using solar radiation to trap heat. This system of heating and circulating air helps to create an artificial environment in a greenhouse that can sustain plants when the outdoor temperature is too cool or variable. Heat enters the greenhouse through its covering of glass or plastic and starts to warm the objects, soil and plants inside. The warmed air near the soil begins to rise and is immediately replaced with cooler surrounding air that starts to heat up. This cycle raises the temperature inside the greenhouse more rapidly than the air outside, creating a sheltered, warmer microclimate.
In temperate climates, the sun might do all the heating in the greenhouse, but where the temperatures plummet, artificial heat may be necessary to maintain temperatures above freezing. Where some greenhouses have access to central heat from the main building, others have to rely on natural or bottled gas, heating coils or heating fans. These will usually work in conjunction with a thermostat. Because heat is one of the biggest expenses of keeping a greenhouse, other sources of energy are always being explored, like the use of solar batteries or animals as heat sources.This makes it possible to keep a greenhouse warm, but it also can cause problems with overheating. In order to keep plants from getting too hot, some method of heat control is necessary. Vents that allow the lighter, hotter air to exit the greenhouse near the roof and cooler air to enter closer to ground level act as air conditioning. Proper ventilation keeps the air in a greenhouse circulating. This helps maintain a stable temperature and also cycles the carbon dioxide (CO2) that plants need for photosynthesis [source: Martell]. Generally, greenhouses have at least two vents, one on or near the roof and one on the lower half of the structure. Mechanical ventilators can also help maintain good airflow and heat control by opening and closing the vents automatically when the temperature in the greenhouse changes.
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