Abstract
Food market in Asia is expanding at dramatic rate. In the near future, there will be about 400 million rich people who will eat raw vegetables as well as Japanese people, which is a great business opportunity for the farmer in Japan who has the know-how to produce high-quality vegetables. However, the weather conditions in Asia, especially in south-east Asia, can induce poor growth of plants because of its distinctive high temperature and humidity. In this case, putting a light shielding material on the outside of film can be a good method for cooling the greenhouse. In this study, the authors investigated the effects of some greenhouse shielding sheets on the environment of greenhouse in hot and humid regions of Asia. Consequently, it became possible to analyze the degree of suppression of the temperature rise of the greenhouse due to absorption of heat rays using shielding materials for the greenhouse at high temperature and its mechanism. It was suggested that focusing on the physical value of the film such as absorption rate is important by this simulation.
Highlights
Today, Japan is lagging far behind countries such as Netherlands in agricultural products export and energy use in agriculture
There are some problems in the cultivation by plant factory, especially greenhouse type of plant factory, in hot and humid area
The authors built a model and performed the simulations to examine the effectiveness of shielding materials as a cooling method for controlling the environment in greenhouse in hot and humid area
Summary
Japan is lagging far behind countries such as Netherlands in agricultural products export and energy use in agriculture. It is said that in the near future, there are about 400 million rich people who will eat raw vegetables as well as Japanese people This is a good opportunity for Japan that has know-how to produce high-quality vegetables to expand its exports. Watering, which is the cooling method using the vaporization heat, is insufficient because water does not evaporate much because of the high humidity in Southeast Asia. There is a problem in the cooling method by introducing shielding material. When shielding material is introduced, it is expected that the rise of temperature by the heat from sunlight decreases because the heat energy entering the greenhouse from sunlight decreases. By introducing shielding material, the heat shielded by the film is absorbed into the film that causes the rise of temperature of film. Shielding sunlight can cause the shortage of the amount of light which is necessary for the growth of plants that can induce poor growth of plants. (Hamamoto et al, 2000)
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