Abstract
A high energy, efficient, harmonious, ecological greenhouse has been highlighted by advanced future agricultural technology recently. This greenhouse is essential for expanding the production cycle toward growth conditions through combined thermal environmental control. However, it has a negative effect on farming income via huge energy supply expenses. Because not only production income, but operating costs related to thermal load for thermal environment control is important in farming income, it needs studies such as a harmonious ecological greenhouse using natural ventilation control. This study is simulated for energy consumption and thermal environmental conditions in a three-layered greenhouse by natural ventilation using window opening. A virtual 3D model of a three-layered greenhouse was designed based on the real one in the Gangneung area. This 3D model was used to calculate a thermal environment state such as indoor temperature, relative humidity, and thermal load in the case of a window opening rate from 0 to 100%. There was also a heat exchange operated for heating or cooling controlled by various setting temperatures. The results show that the cooling load can be reduced by natural ventilation control in the summer season, and the heat exchange capacity for heating can also be simulated for growth conditions in the winter season.
Highlights
As the proportion of farmers using greenhouses has increased recently, studies on the farm household income of domestic and foreign greenhouses have been actively carried out
Heating the facilities is necessary in winter and cooling is required to avoid high temperatures and humidity in summer, enormous energy costs are required in order to control the thermal environment according to the growth conditions and it is a factor that hurts the profits of farm households, so it is necessary to establish various energy saving measures for the facilities
The cooling load of the enclosed greenhouse and the cooling load by natural ventilation control were found to be 56,386 kW and 47,859 kW, respectively, so it was confirmed that the cooling load can be reduced by approximately 17.82% (8,527 kW) when natural ventilation control is used
Summary
As the proportion of farmers using greenhouses has increased recently, studies on the farm household income of domestic and foreign greenhouses have been actively carried out. In Korea, as in other countries, combined thermal environment control technology for the greenhouse to increase the productivity of cultivated crops through the smart farm is necessary in order to improve the profitability of farm households. Heating the facilities is necessary in winter and cooling is required to avoid high temperatures and humidity in summer, enormous energy costs are required in order to control the thermal environment according to the growth conditions and it is a factor that hurts the profits of farm households, so it is necessary to establish various energy saving measures for the facilities. A disadvantage of renewable energy sources is that they may not be able to supply energy in a timely manner due to the volatility of the output This problem may lead to a shortage of supply energy as well as failure to supply necessary energy in a timely manner
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