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Method for measuring transmissivity of direct light to covering layer of sunlight greenhouse

A technology of solar greenhouse and measurement method, which is applied in the field of agricultural environment, and can solve the problems of not considering the radian of the roof and the angle of direct solar radiation

Active Publication Date: 2018-01-30
INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the defect that the existing solar greenhouse direct light transmittance measurement method does not consider the roof radian and the direct solar radiation angle, the present invention provides a method for measuring the direct light transmittance of the covering layer of the solar greenhouse

Method used

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  • Method for measuring transmissivity of direct light to covering layer of sunlight greenhouse
  • Method for measuring transmissivity of direct light to covering layer of sunlight greenhouse
  • Method for measuring transmissivity of direct light to covering layer of sunlight greenhouse

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Embodiment 1

[0079] In this embodiment, the solar greenhouse has a span of 10m and a length of 60m. according to figure 1 As shown, the direct light transmittance of the covering layer of the solar greenhouse is determined by the following steps:

[0080] S1. Divide the covering layer into 6 tiny curved surfaces, each tiny curved surface is regarded as a micro-unit, and the micro-unit is approximately considered as a plane, and the angle between each micro-unit and the ground is calculated to obtain:

[0081]

[0082] Plane section, the section straight line length of each micro-unit is obtained as follows:

[0083] L 1 =0.85m,L 2 =0.91m, L 3 =0.87m, L 4 = 1.01m, L 5 =2.54m, L 6 =3.69m.

[0084] S2: The latitude of the greenhouse is 40°, and the azimuth of the greenhouse is 90°;

[0085] Calculated solar declination δ for the 74th day of the year;

[0086]

[0087] Divide the 24 hours on the 74th day by decimal system, the time interval is 15 minutes, and there are 96 nod...

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Abstract

The invention belongs to the technical field of agricultural environment, and particularly relates to a method for measuring transmissivity of direct light to a covering layer of a sunlight greenhouse. The method comprises the following steps of dividing the covering layer into a plurality of small curved surfaces as micro-units, considering each micro-unit as a plane, calculating an included angle between each plane and ground, and calculating an included angle between the sun direct light and a normal line of each micro-unit of the covering layer of the sunlight greenhouse according to the azimuth of the greenhouse, and the sun elevation angle and sun azimuth of the longitude of the greenhouse at the to-be-tested time point; calculating the transmissivity of each micro-unit, and weighting, so as to obtain the transmissivity of the direct light to the covering layer of the sunlight greenhouse, thereby instructing the production in the greenhouse. The method has the advantage that thecovering layer of the greenhouse is divided into multiple curved surfaces, and each curved surface is simplified into the plane, so that the change rule of the transmissivity of sun radiation direct light at each plane along with time is analyzed, the change rule of sun radiation direct light of the whole covering layer along with the time is comprehensively calculated, and then the influence to the transmissivity of sun radiation direct light by the covering material and the greenhouse structure can be more accurately reflected.

Description

technical field [0001] The invention belongs to the technical field of agricultural environment, and in particular relates to a method for measuring the direct light transmittance of a solar greenhouse covering layer. Background technique [0002] The solar greenhouse is a unique type of greenhouse structure in my country. It has outstanding advantages such as energy saving, high efficiency, and low cost. It has developed rapidly in the three north regions of my country in the past 20 years, and its regional scope has expanded to 32°-48° north latitude. , the cultivated area has grown from 3,000 ha in 1990 to more than 1 million ha in 2015. Reasonable greenhouse structure design is the technical basis for high efficiency and energy saving in solar greenhouses. For a long time, due to the lack of systematic research on the mechanism of temperature and light, the design and construction of solar greenhouses mostly rely on experience. The phenomenon of insufficient heat energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/59
Inventor 方慧杨其长张义程瑞锋李涛伍纲仝宇欣李琨
Owner INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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