引用本文:
【打印本页】   【下载PDF全文】   查看/发表评论  下载PDF阅读器  关闭
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 852次   下载 570 本文二维码信息
码上扫一扫!
分享到: 微信 更多
太阳能空气集放热系统在温室中的热性能研究
宋 磊1, 曹晏飞1, 王 浩,等1
西北农林科技大学 园艺学院 农业部西北设施园艺工程重点实验室
摘要:
【目的】设计一种太阳能空气集放热系统并在温室中进行实际测试,以此探究该系统的热性能表现,分析其各项性能参数,为后续改进优化太阳能空气集放热系统及其在温室中的应用提供依据。【方法】在太阳能平板集热器的基础上,通过给集热器加装用于基质升温的散热管道来进行太阳能空气集放热系统的设计,该系统以太阳能为热源,白天集热器收集太阳热能并实现对空气的加热,同时在管道风机的作用下通过空气循环将热空气输送到散热管道中释放热量,以此实现系统的集热和放热,从而提升基质温度。将日光温室用聚苯板分隔,以采用了太阳能空气集放热系统的隔间作为试验区域,以不采取任何措施的隔间作为对照区域,通过测定温室环境温度、集热器内部空气温度、散热管道温度、太阳辐射强度、空气流速和基质温度,分析空气流速、环境温度、太阳辐射强度对系统瞬时集热量和集热效率的影响,并分析集热器和散热管道从进气口到出气口各部位的温度变化,最后对该系统的整体热性能以及与温室对照区域基质的温度差异进行分析和比较。【结果】通过实测,空气流速为2.0 m/s时,太阳能空气集放热系统的集热效率和瞬时集热量最高,分别为67.7%和494.4 W/m2,在此流速下,集热器内空气温度平均提升27 ℃,散热管道进气口到出气口平均温差为16.2 ℃;系统集热效率还受环境温度和太阳辐射强度的影响,其随着二者的增加逐渐提高;系统运行期间,系统集热量为6.0~9.3 MJ/m2,放热量为4.7~6.8 MJ/m2,能量利用效率为73%~78.2%;典型晴天条件下,温室试验区域基质温度始终高于对照区域,平均高2.7 ℃。【结论】太阳能空气集放热系统性能表现优异,具有较高的集热效率和放热性能,同时具有较高的能量利用效率,适合在温室中进行推广应用。
关键词:  集放热系统;温室;热性能;集热效率  设施园艺
DOI:
分类号:
基金项目:陕西省重点研发计划项目(2019TSLNY01-03);陕西省农业科技创新转化项目(NYKJ-2019-YL06);现代农业产业技术体系建设专项(CARS-23-C05)
Thermal performance of a solar air collection and heat release system used in greenhouse
SONG Lei,CAO Yanfei,,WANG Hao,et al
Abstract:
【Objective】A solar air collection and heat release system was designed and tested in a greenhouse to explore its thermal performance and related parameters to provide evidence for its optimization and applications in greenhouses.【Method】The solar air collection and heat release system used solar energy as heat source and was based on solar flat-plate collector to collect solar energy.Hot air was sent to heat release pipe through air circulation and released heat under fan.The system realized heat collection and heat release for increasing substrate temperature.The test divided solar greenhouse with polystyrene board,a compartment with solar air collection and heat release system used as test area,and another compartment without any measures used as control area. The effects of air flow rate,ambient temperature, solar irradiance on instantaneous heat collection and heat collection efficiency of system were analyzed,and temperature changes of collector and heat release pipe from air inlet to outlet was analyzed by measuring ambient temperature of greenhouse,temperature of air inside collector,temperature of heat release pipe,solar irradiance,air velocity,substrate temperature.The overall thermal performance of the system and temperature difference of substrate between test area and control area were analyzed and compared.【Result】The maximum heat collection efficiency of system was 67.7% and the instantaneous heat collection was 494.4 W/m2.When air velocity was 2.0 m/s,the air temperature in collector increased by an average of 27 ℃,and the average temperature difference from air inlet to outlet of heat release pipe was 16.2 ℃.Heat collection efficiency of system was also affected by ambient temperature and solar irradiance,and it gradually increased with increase of ambient temperature and solar irradiance.During operation of system,heat collection of system was 6.0-9.3 MJ/m2,heat release of system was 4.7-6.8 MJ/m2,and energy utilization efficiency of system was 73%-78.2%.The substrate temperature in greenhouse test area was always higher than control area,with an average of 2.7 ℃ under typical sunny day.【Conclusion】The solar air collection and heat release system had excellent performance and high energy utilization efficiency with high heat collection efficiency and heat release performance.It is suitable for popularization and application in greenhouses.
Key words:  collection and heat release system  greenhouse  thermal performance  heat collection efficiency  protected horticulture