Design And Experiment Of Small Closed Growth System For Plants

Long term workers in the desert region,such as ocean sailing,desert,polar and wilderness areas,are prone to negative emotions such as fatigue,tension,stress,confusion,anger and uneasiness due to the existence of isolated and dry in these areas,and such negative emotions will seriously affect the work efficiency and health of the people.Many psychologists have found that green plants can effectively regulate the negative emotions of people,so planting green plants in these special areas is essential to improve people’s living conditions,but workers in these areas tend to work hard,with the needs of plants,but lack of time and energy to manage the plant.Therefore,developing a plant growth system with unmanned and self-sustaining ability to ensure normal survival of plants over a period of time has market prospects.Due to the lack of power supply in the desert area,the plant growth system should adopt unconventional power supply mode.At present,the research on self-sustaining plant growth system at home and abroad is only in the national space exploration project.And they are all large projects.However,there are few reports on the small civilian size and self-sustaining plant growth system.To solve the above problems,this paper constructs a self-sustaining plant growth system test device to explore the energy supply and internal environment maintenance of self-sustaining plant growth system.The device uses photovoltaic power supply,and is designed to use in environment of high temperature area.In this paper,the three-dimensional simulation software SolidWorks is used to design the structure of the cultivating room.The test object is selected as the spathiphyllum kochii,and the structure of the cultivating room is optimized through the experiment.Finally,the volume of the cultivation room is 5.625×10~3cm~3.After the cultivation room was completed,the thermal capacity of the breeding room was analyzed.According to the heat capacity,the cooling capacity needed to maintain the indoor temperature and humidity environment was calculated.Accordingly,the suitable refrigerating machine was selected and the environmental control system composed of cooling system and drip irrigation system was designed.Then,according to the average daily power consumption of the self-sustaining plant growth system,the capacity of photovoltaic power generation system is calculated,and the photovoltaic power generation system is designed.In order to guarantee the survival cycle of spathiphyllum kochii in the cultivating room,this paper designs a control system based on STC89C52 MCU,which can monitor and control the indoor environment in real time,and ensure the survival of the spathiphyllum kochii in the plant growth system.Firstly,this paper designed the self-sustaining plant growth system based on the theoretical analysis.After that,the performance test of the power supply system and the performance test of the whole machine working.The experimental results showed that the temperature and humidity of the indoor environment of the 5.625×10~3cm~3 cultivating room was maintained,and the cooling system was required to be controlled by 367.5~490W for the cooling system.The temperature can be maintained at 31~39℃and the relative humidity is maintained at 72%~85%.When the total power consumption of the system is552Wh,the weather condition is"three sunny days and two cloudy days"in Guangzhou area,the photovoltaic power system is required to provide 350W effective power generation power,and the design capacity of the battery should be 200Ah.The test results also verify that the cooling has a basic balance between the cooling capacity of the cooling system and the self holding plant growth system.The energy supply balance between the electrical energy provided by the photovoltaic power generation system and the power consumption of the system is balanced.The spathiphyllum kochii placed in in the cultivating room is growing well during the 7 days design cycle.The test device runs stably and meets the basic design requirements.The research results can provide a basic technical reference for the design of self-sustaining plant growth system based on photovoltaic.