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Research on the Active Solar Heating System of Greenhouse in Intense Cold Area

Author: YuXueJiang
Tutor: LiuXiaoYan
School: Northeast University of Petroleum
Course: Heating, Gas Supply , Ventilating and Air Conditioning
Keywords: Solar greenhouse Solar Collector system Thermal storage Numerical Simulation
CLC: S625
Type: Master's thesis
Year: 2011
Downloads: 108
Quote: 0
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Abstract


Cold regions of the solar greenhouse has conducted in-depth research . Daqing region , for example , the analysis of the sunlight greenhouse nighttime low temperatures of the cold regions of the crop and its reasons . On this basis , a set of active solar heating system design , the system is divided into three main parts: the collector part , part of the thermal energy storage and heating parts . The solar greenhouse night temperature and ground temperature increased , the solar greenhouse crops to safe winter at the same time , increase the amount of crop output . The main work is as follows : 1. Heat storage of several analysis , the choice of water as a storage medium is a sensible heat storage . Greenhouse heat transfer analysis , determined that greenhouse heat load in each period of the heating season , on this basis, to determine the specifications of the greenhouse in the water tank and the insulation structure . 2. Combined the the Daqing location and characteristics sunshine , set up a semi- fixed solar collectors can be adjusted . According to the change in angle of the different months of solar rays , by the inclination of the collector to be adjusted , so that the collector be able to maintain a higher long - term collector efficiency . 8.3% semi-fixed adjustable collector allows the collector collector efficiency heating solar greenhouse at night to collect more heat . According to the the greenhouse nighttime heat demand , calculate the collector area should be arranged . Heating part of the design chosen is close to the ground circuitous laying heating coil, while improving the greenhouse temperature , the soil temperature can be maintained . Greenhouse environment to simulate different heating pipeline laying way to determine the length of the pipeline , from the distance between the ground level and the pipeline . Meanwhile, we simulated the greenhouse temperature field under several different conditions , analysis of the reasonableness of the addition of active solar heating system active solar heating system can improve the greenhouse temperature at night 3-5 ℃, a crops the growth of the security environment. (4) the active solar heating systems used in the greenhouse benefit analysis . The operation of the system provides the appropriate temperature for crop growth , compared with the burning of coal and other heating annual cost savings of around $ 800 , to reduce emissions of carbon monoxide , sulfur dioxide and other harmful gases and impurities .

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CLC: > Agricultural Sciences > Gardening > Horticultural ( protected cultivation ) > Greenhouse
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