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| Active Heating Technology and Equipment for Chinese Solar Greenhouse |
| ZHOU Changji |
| Academy of Agricultural Planning and Engineering，Ministry of Agriculture and Rural Affairs（MARA），Beijing 100125，China |
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Abstract Solar greenhouse is a high-efficiency energy-saving one，mainly relying on solar energy and efficient heat preservation function of its exterior protected construction to maintain normal growth temperature required by indoor crops．Under normal weather conditions，the solar greenhouse can efficiently receive and storage solar energy in daytime，tightly insulate and slowly release thermal energy at night through optimized design．In most areas of Northern China，production can be safely conducted without additional heating at all．But，in some severe-cold and high-latitude areas；when encountering with extreme weather conditions like haze，dust，snowstorm，severe cold，successive cloudy days，etc.；and when planting high-quality crops requiring reliable environment，temporary short-term heating is necessary so as to ensure the normal growth of vegetable crops．This paper summarized the current active heating technology and support equipment used in domestic solar greenhouses，according to different types of energy heating sources，including solar energy，electric energy，biomass energy，etc. clean energies，and traditional fossil energies，like coal，diesel，natural gas，etc．Thus，technical support is provided for designing and management of solar greenhouses in China．
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Received: 16 January 2023
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