Using solar energy to supply energy for greenhouse planting can not only provide suitable environment for crop growth, but also reduce the carbon emissions of greenhouse energy consumption. Strawberry has high economic benifit and ornamental valus in greenhouse crops. The optimum temperature for the development of strawberry fruit is between 18~22 deg c. Therefore, the yield and quality of strawberry can be improved by constant heating in greenhouse.
The solar energy heat pump heating system is used in strawberry stereo cultivation. According to the demand of strawberry for light and temperature, the stepped heating system of greenhouse is designed and constructed. The heating pipe and strawberry stereo cultivation frame are effectively combined to study the heating energy efficiency of solar energy heat pump system and the optimum heating height range under the same heating conditions in order to improve strawberry quality and increase strawberry quality. The purpose of increasing production.
From the space efficiency of heating, when the solar heat pump system has the same heating coefficient in this type of single-layer polyethylene film greenhouse, the optimum heating height range is 1.0-1.5 m from the ground, which not only ensures the suitable temperature range for strawberry growth, but also avoids the situation that strawberry plants in the greenhouse are too high to be easily burned by solar radiation.
In the winter of low latitude plateau monsoon climate area in the north subtropical zone, solar energy heat pump system is used to heat strawberry greenhouse, which shortens the heating time of heat pump and saves power energy compared with heat pump alone. When the ambient temperature is 5-10 degree C, only 54.5% of the heat load of greenhouse is provided by the heating terminal equipment, which can effectively raise the temperature of greenhouse. In addition, the heating system also improves the yield and quality of greenhouse crops.