Solar energy heat collecting and storing system of agricultural greenhouse

Abstract

The invention discloses an active solar energy greenhouse heat collecting and storing system which combines a north wall of an agricultural greenhouse with solar energy heat collecting and phase change heat storing. A solar energy heat absorbing plate and a heat storing unit provided with phase change heat storing material are integrated on the north wall of the agricultural greenhouse. In the daytime, the sunlight irradiates on the heat absorbing plate, the solar radiant energy is converted into the heat energy, and the heat is transferred to the heat storing unit after the heat absorbing plate is heated. The phase change material in the heat storing unit is molten after being heated and the heat is stored. At night, the heat storing unit slowly radiates heat to the greenhouse through radiation; when the temperature is too low, a fan is started to drive the air to flow so as to lead the heat to be radiated quickly from the heat storing unit for heating the greenhouse at night, thereby achieving the purpose of heat storing in the daytime and heating at night for the agricultural greenhouse. The invention has the advantages of simple structure, small occupied area and high thermal efficiency and can effectively improve the night temperature of the agricultural greenhouse and further improves the crop yield by full use of the solar energy and the heat insulating performance of the greenhouse under the premise of consuming few conventional energy resources (electric energy of the fan).

Description

1. Technical field [0001] The invention relates to solar heat utilization and agricultural greenhouse technology, in particular to a solar greenhouse heat storage system that combines solar heat collection and phase change heat storage technology and is applied to agricultural greenhouses. 2. Background technology [0002] Human beings have been using solar energy for a long time. The invention of various selective absorbing coatings and thermal insulation materials enables people to use solar energy efficiently to provide domestic hot water and building heating. However, in the field of agricultural greenhouses, the utilization of solar energy is still relatively low, basically limited to passively receiving solar radiation. If it is possible to actively absorb solar energy and heat in the greenhouse during the day, and store the heat for heating the greenhouse at night, the production efficiency and utilization level of the solar greenhouse will be greatly improved. [00...

AI Technical Summary

Problems solved by technology

However, the roof of the greenhouse needs to be transparent, and the area for installing solar collectors is limited, and the path taken by the hot air is too long, resulting in a large heat loss

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