Ground assisted enhanced greenhouse roof truss solar energy heat collecting and releasing system and regulating and controlling method

Abstract

The invention discloses a ground assisted enhanced greenhouse roof truss solar energy heat collecting and releasing system and a regulating and controlling method, and belongs to the field of environmental control of facility agricultural engineering. A ground pipe network system, an underground water storage reservoir and a control system are added in a greenhouse roof truss solar energy heat collecting and releasing system; the greenhouse roof truss solar energy heat collecting and releasing system is divided into three independent pipe network systems, namely, an upper chord, a lower chordand the ground pipe network, which are respectively provided with independent water pumps and can operate separately; the function of the upper chord of a roof truss is regulated to have a heat collecting function so as to avoid that heat losses easily through the roof; the heat collecting and releasing system is used for storing heat during the day and meanwhile used for releasing heat during thenight; timed and staged regulating and controlling is realized; a heat releasing position is more reasonable through a combined heat releasing mode of the ground pipe network and the lower chord of the roof truss; targeted heating of crop roots and canopy space is realized; the utilization rate of the stored heat is improved. The problem of insufficient heat storage of the system in a specific period, such as a crop seedling period, is solved pertinently.

Description

technical field [0001] The invention belongs to the field of facility agricultural engineering environment control, in particular to a ground-assisted enhanced greenhouse roof truss solar energy collection and release system and a control method. Background technique [0002] Since the reform and opening up, the economy has continued to develop rapidly, and people's demand for facility planting products has greatly increased. my country's greenhouse construction has entered a period of rapid development. The solar greenhouse is a form of greenhouse independently developed by my country. Its structural characteristics are that the south roof uses transparent plastic film as the main light-transmitting covering material, and the east and west gables, north wall, and north roof are heat-insulating and heat-storing structures. During the day, part of the solar energy entering the greenhouse through the light-transmitting surface is absorbed and stored by the wall and soil; at ni...

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Problems solved by technology

However, it was discovered during use that there are still two problems with this system. One is that the number of greenhouse roof trusses is limited, and the heat collection needs to be improved during the day; It is not ideal, and the heat utilization efficiency is not high; the third is that the upper chord of the roof truss is in contact with the film of the light-transmitting surface, and the light-transmitting surface is the place with the weakest thermal insulation capacity at night, so a large part of the heat emitted

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