Mild hypothermia phase change heat storing and heat releasing system for greenhouse

Abstract

The invention belongs to the technical field of agricultural greenhouse environmental control, and particularly relates to a mild hypothermia phase change heat storing and heat releasing system for agreenhouse. A mild hypothermia phase change material matching with greenhouse environmental characteristics and crop demands with different phase change temperatures is adopted by the system, the material is combined and used to achieve the purposes of sufficient collecting and storing of daylight surplus heat in the greenhouse and the gradient supplying of heat needed at night, a phase change heat storing technology, a mild hypothermia phase change material combination technology and a solar energy utilization technology are organically combined to solve the problems of insufficient heat releasing staying power at the latter half of the night, excessively long delay of heat releasing and the like of the system, and bad weather conditions can be better coped with to ensure an appropriate crop growing environment in the greenhouse.

Description

technical field [0001] The invention belongs to the technical field of greenhouse environment control for facility agriculture, and in particular relates to a subnormal low-temperature phase change heat storage and release system for greenhouses. Background technique [0002] With the development of social economy and the improvement of people's living standards, the people's demand for agricultural products is growing rapidly, and the demand for off-season agricultural products is increasing day by day, so the role of greenhouses in agriculture is increasing. [0003] Greenhouse crop production is an important mode of modern agricultural production. Compared with field crop production, its production process is less affected by external climate changes. At the same time, the microclimate environment in the greenhouse can be controlled according to the needs of crop growth. However, in actual production, even in winter, the temperature is often too high during the day becaus...

AI Technical Summary

Problems solved by technology

The needs of greenhouses are different from those of general buildings. For example, the minimum nighttime temperature of fruit and vegetable crops in common greenhouses should not be lower than 10-15°C. Phase change materials with a change temperature above 20°C are poorly compatible with the intervals that need to be supplemented by greenhouses, often resulting in a low phase change rate during daytime heat storage, and when heat is released at night, the heat release time is too early and the heat release is insufficient in the second half of the night , or problems such as heat release time lag

On the other hand, the single type of phase change materials commonly used in the greenhouse field is often unable to completely match the characteristics of the temperature change process of the greenhouse at night. If the material is modified, it is difficult to meet the requirements for its various performances, and at the same time greatly increases the cost. and there is a certain risk

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