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| A High Insulation Solar Greenhouse‘Double Film-Double Blanket-Double Chamber’—Suitable for Usage In Extremely Cold Region |
| ZHOU Changji1 ，SUN Zhaowen2 ，XU Zhe2 |
| 1 Academy of Agricultural Planning and Engineering，MARA，Beijing 100125，China；2 Mudanjiang Zhongheng Technology Co.，Ltd.，Mudanjiang 157000，Heilongjiang，China |
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Abstract In order to further improve the light and temperature performance of Chinese solar greenhouse，and enable the over winter vegetable production in areas north of 50° N with extreme temperature below -40 ℃，yet having no auxiliary heating，this paper proposed a ‘double film-double blanket-double chamber’（D-FBC）high insulation greenhouse after reserch innovation．The lighting roof angle of the greenhouse reached 53.82°，and horizontal projection ratio of front and rear roofs was less than 1∶1．The overall lighting and insulation capacity of the greenhouse were significantly improved．At the same time，the supporting greenhouse basic insulation + lighting surface ‘double film-double blanket-double chamber’thermal insulation + back wall water column passive heat storage + gas water heat exchange ground soil active heat storage and release system all had helped maintaining the greenhouse indoor temperature above 9 ℃，even when the outdoor extreme temperatures was below -48 ℃．Thus，safe over winter vegetable production in Tahe County，Heilongjiang Province，at 52° north latitude was successfully realized．
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Received: 14 June 2023
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