how does the heat energy flow into the greenhouse?
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Answer:
The heat loss or gain in a greenhouse occurs in 4 different ways: conduction, convection, radiation and infiltration.
Conduction occurs when heat is transferred between two bodies in direct contact.
Convection occurs when the heat is transferred via a fluid like water or air to the surface of an object.
Radiation occurs when the heat is transferred without any physical contact or with the help of a fluid (e.g. solar radiation).
Infiltration occurs when there is an exchange or leakage of air between the inside and the outside.