| 摘要 |
PURPOSE: A duct device of a greenhouse is provided to discharge cold air and heated air through a duct laid under the floor of the greenhouse to maintain the internal temperature of the greenhouse uniform to thereby reduce thermal shock applied to plants. CONSTITUTION: A duct device of a greenhouse comprises branch ducts(122), a main duct(121), an air-conditioner, and heat supply source. The branch ducts are arranged on the floor of the greenhouse and include exhaust holes. The ends of the branch ducts are connected to the main duct. The air-conditioner is located inside or outside the greenhouse, connected to the main duct and blows cold air or hot air to the main duct. The heat supply source is connected to the air-conditioner and absorbs heat from the air passing through the air-conditioner or emits heat. A plurality of air-conditioners is connected in parallel through a circulation line. The heat supply circle is connected to the circulation line such that refrigerant circulates the air-conditioners along the circulation line.
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