Daylight greenhouse building orientation simplification design calculation method

A solar greenhouse, design and calculation technology, applied in calculations, special data processing applications, instruments, etc., can solve problems such as large value range, large method differences, and poor referenceability

Active Publication Date: 2017-12-15
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] At present, my country has not yet formed a guiding design method for the orientation of solar greenhouse buildings. It is more based on experience. The value ran...

Method used

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  • Daylight greenhouse building orientation simplification design calculation method
  • Daylight greenhouse building orientation simplification design calculation method
  • Daylight greenhouse building orientation simplification design calculation method

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Embodiment Construction

[0029] The present invention will be further described below by taking the Beijing area as an example.

[0030] 1. The longitude of the Beijing area is 116.3°E, and the latitude is 39.9°N; the critical period for winter vegetable production in solar greenhouses is from November 1 to February 28 of the following year.

[0031] 2. According to formula (1) and formula (2), calculate the daily sunrise time and sunset time during the critical period of winter vegetable production in the local solar greenhouse. Taking the big cold day as an example, the date ordinal number is 21,

[0032]

[0033]

[0034] 2. According to formula (3) and formula (4), calculate the opening and closing time of the roof insulation cover in front of the solar greenhouse every day during the local off-season production period, taking the severe cold day as an example

[0035]

[0036] 3. Calculate the value of the declination angle δ every day during the local off-season production period accord...

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Abstract

The invention provides a daylight greenhouse building orientation simplification design calculation method, and belongs to the field of facility agriculture building energy-saving design. With the control target that a greenhouse front roof accumulated intercepted total solar radiation amount in the critical period for daylight greenhouse overwintering out-of-season production of thermophilic fruits and vegetables being the largest and with the greenhouse sunshine time and the sunshine quality being the constraint condition, a design calculation simplification model of the daylight greenhouse building optimal orientation based on a mathematical extreme value theory is constructed. Through the model, an optimization design recommended value of the daylight greenhouse building orientation in regions with different geological latitudes can be given. The daylight greenhouse building orientation simplification design calculation method provides an important theoretical basis for formulating relevant design standards or norms in China. When the geological latitude of an engineering field and the vegetable production critical production period which needs to be ensured by a greenhouse are determined, according to the daylight greenhouse building orientation simplification design calculation method, the optimization design value of the daylight greenhouse building optimal orientation can be obtained through calculation, and the daylight greenhouse energy-saving effect is remarkable under the optimal building orientation.

Description

technical field [0001] The invention relates to a solar greenhouse building orientation design technology, a solar greenhouse building orientation optimization design method for efficiently utilizing solar energy according to climate characteristics in different geographical latitude regions, and belongs to the field of energy-saving design of facility agricultural buildings. Background technique [0002] The solar greenhouse is a facility agricultural building that relies on passively receiving solar heat to maintain the ambient temperature in the greenhouse to meet the production needs of off-season overwintering vegetable crops. The building orientation of the solar greenhouse not only directly affects the acceptable sunshine time of the solar greenhouse in a day, but also affects the area of ​​the solar greenhouse wall and the ground illuminated by sunlight during the effective sunshine time (also called the spot area). Due to the dynamic change characteristics of solar ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 陈超李印李娜杨枫光凌浩恕马彩雯孙超韩枫涛
Owner BEIJING UNIV OF TECH
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