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日光溫室中空板水循環(huán)集放熱系統(tǒng)設(shè)計(jì)與集熱性能試驗(yàn)
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現(xiàn)代農(nóng)業(yè)產(chǎn)業(yè)技術(shù)體系建設(shè)專項(xiàng)資金項(xiàng)目(CARS-23-C02)


Test on Heat-collecting Performance of Solar Heat Collection and Release System with Water Cycling inside Hollow Plates in Chinese Solar Greenhouse
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    摘要:

    針對(duì)現(xiàn)有日光溫室內(nèi)置式水循環(huán)集放熱裝置存在的集熱能力不足的問題,設(shè)計(jì)了中空板水循環(huán)太陽能集放熱系統(tǒng),通過理論分析,結(jié)合日光溫室熱環(huán)境模擬預(yù)測軟件,驗(yàn)證系統(tǒng)可行性。理論計(jì)算表明,在室內(nèi)地面面積400m2聚苯板墻體日光溫室內(nèi),系統(tǒng)集熱總量可達(dá)350MJ,可供日光溫室2~3d的夜間放熱加溫。通過現(xiàn)場試驗(yàn)測試系統(tǒng)的集熱性能,試驗(yàn)結(jié)果表明:系統(tǒng)集熱效率最大可達(dá)0.93;晴天條件下的系統(tǒng)日蓄熱溫升約比陰天條件下高1倍;在太陽輻射較弱時(shí),中空板與室內(nèi)空氣的對(duì)流換熱對(duì)集熱效率影響顯著;在3.3~5.9m3/h的流量范圍內(nèi),系統(tǒng)集熱量隨著水流量增大而增加。中空板系統(tǒng)作為裝配式集熱系統(tǒng),建造成本低、簡單實(shí)用,不占用室內(nèi)栽培面積,適用于舊溫室改造。

    Abstract:

    A solar heat collection and release system with water cycling inside hollow plates was developed to address the problems currently existed in these built-in water cycling installations for solar heat collection and release in a Chinese solar greenhouse (CSG). The feasibility of the system was theoretically analyzed and verified by using a simulation software to predict the thermal environment in a CSG. According to the theoretical calculation, the amount of heat collected by the developed system, which was installed in the CSG with polystyrene wall and the indoor floor area of 400m2, can approach to approximately 350MJ, thereby being sufficient to enhance the indoor temperature for 2~3 nights in a CSG. The heat-collecting performance of the system was then preliminarily analyzed through a field test. The results showed that the collecting efficiency can maximally reach 0.93. During heat accumulation period, water temperature rise in a sunny day was approximately double than that in a cloudy day. The convective heat transfer between hollow plates and indoor air had a significant effect on the heat collecting efficiency when solar radiation was weakened. The collected heat from the system was increased with the increase of water flow in a range of 3.3~5.9m3/h. The hollow plate system investigated had lower construction cost and a simple practical design compared with conventional systems. Besides, this system did not occupy indoor cultivation area, which, as fabricated solar collector, was suitable for the transformation of traditional CSG.

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徐微微,馬承偉,宋衛(wèi)堂,程杰宇,王平智.日光溫室中空板水循環(huán)集放熱系統(tǒng)設(shè)計(jì)與集熱性能試驗(yàn)[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2018,49(7):326-334. XU Weiwei, MA Chengwei, SONG Weitang, CHENG Jieyu, WANG Pingzhi. Test on Heat-collecting Performance of Solar Heat Collection and Release System with Water Cycling inside Hollow Plates in Chinese Solar Greenhouse[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(7):326-334.

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  • 收稿日期:2018-03-20
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  • 在線發(fā)布日期: 2018-07-10
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