共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
4.
5.
A building-integrated multifunctional PV/T solar window has been developed and evaluated. It is constructed of PV cells laminated on solar absorbers placed in a window behind the glazing. To reduce the cost of the solar electricity, tiltable reflectors have been introduced in the construction to focus radiation onto the solar cells. The reflectors render the possibility of controlling the amount of radiation transmitted into the building. The insulated reflectors also reduce the thermal losses through the window. A model for simulation of the electric and hot water production was developed. The model can perform yearly energy simulations where different features such as shading of the cells or effects of the glazing can be included or excluded. The simulation can be run with the reflectors in an active, up right, position or in a passive, horizontal, position. The simulation program was calibrated against measurements on a prototype solar window placed in Lund in the south of Sweden and against a solar window built into a single family house, Solgården, in Älvkarleö in the central part of Sweden. The results from the simulation shows that the solar window annually produces about 35% more electric energy per unit cell area compared to a vertical flat PV module. 相似文献
6.
7.
T91管屏埋弧焊裂纹分析及焊接试验 总被引:1,自引:0,他引:1
介绍了T91钢用于炉膛膜式管屏的埋弧焊焊接过程中出现的典型裂纹,综合各种因素对裂纹的形成原理进行了分析.通过试验证实对于拘束应力大的T91管屏,埋弧焊拼排可通过多层焊获得合格的T91管屏.按此工艺生产多台CFB锅炉T91管屏,投运锅炉运行情况良好. 相似文献
8.
T/P91钢焊接质量控制至关重要,从影响焊接质量的5个因素着手,结合多年来的焊接实践经验,分别阐述了人员、设备、材料、工艺、环境等方面的控制要点,指出了容易产生缺陷的关键点,并对不同焊接方法的质量控制过程进行了详述,分析了焊接工艺对接头性能的影响,最后对预防和消除不合格焊缝提出了控制措施. 相似文献
9.
10.
11.
大力神130型焦炉煤气燃气轮机点火升速期间出现AL_T5_TC_Fail(T5热电偶故障)报警、CL_5_TC_Fail(多个E热电偶故障)并且导致停机。对各个相关系统进行检查分析,提出解决办法。最终发现该故障原因为部分喷嘴堵塞,故障检查可为同类机组提供参考。 相似文献
12.
本文介绍了循环流化床中SA-213T91管子膜式壁管屏制造的工艺技术以及在制造过程中需要注意的问题。 相似文献
13.
对T形墩消力池的水力特性及体型进行了试验研究,并结合工程实例及前人的试验,给出了T形墩消力池水力特性的经验公式,可作为工程设计参考和应用。 相似文献
14.
15.
提出一种真空玻璃盖板平板式PV/T集热器,建立了真空玻璃和单层玻璃盖板PV/T集热器的传热模型,并分别搭建了两种PV/T热水系统的实验平台进行模型的实验验证。预测结果与实验测量结果的均方根偏差(RMSD)在0.71% ~ 11.17%之间。利用数学模型模拟了真空玻璃与单层玻璃盖板PV/T集热器在合肥冬季的热、电性能,并比较了两者性能的差异。模拟结果表明真空玻璃盖板PV/T集热器的顶部热损失平均为22 W,而单层玻璃盖板PV/T集热器热损失平均为107 W。使用真空玻璃盖板能显著减少PV/T集热器的顶部热损失。真空玻璃盖板PV/T集热器相对单层玻璃盖板PV/T集热器的全天热效率提高了5.68%,二者分别为41.76%和36.08%,全天电效率分别为11.76%和12.79%,相差1.03%。 相似文献
16.
Excess temperatures on installed photovoltaic (PV) modules lead to efficiency loss and PV cooling protects them from this undesirable efficiency drop. Both water and air have been used for PV cooling through a thermal unit attached to the back of the module yielding photovoltaic/thermal (PV/T) collector, but air is preferred due to minimal use of material and low operating cost despite its poor thermo-physical properties. This study investigates the performance of two low cost heat extraction improvement modifications in the channel of a PV/T air system to achieve higher thermal output and PV cooling so as to keep the electrical efficiency at acceptable level. The use of thin flat metal sheet suspended at the middle or finned back wall of an air channel in the PV/T air configuration are the suggested methods. A theoretical model is developed and validated against experimental data, where good agreement between the predicted results and measured data were achieved. The validated model was then used to study the effect of the channel depth, channel length and mass flow rate on electrical and thermal efficiency, PV cooling and pressure drop for both improved and typical PV/T air systems and their results were compared. Both experimental and theoretical results show that the suggested modifications improve the performance of the PV/T air system. 相似文献
17.
PV/T电、热联产系统在理想条件下的性能简化分析 总被引:2,自引:0,他引:2
对PV/T电、热联产系统的输出性能作了简化分析,对不带玻璃盖板和带玻璃盖板的PV/T系统在一般风速(2m/s)和较大风速(5m/s)两种情况下的输出性能进行了比较。分析表明,虽然不带玻璃盖板的PV/T系统的光伏转换效率要比带玻璃盖板系统的高出10%左右,但对风速为5m/s的情况,其热能输出已微乎其微。分析结果还表明,在两种风速条件下,带玻璃盖板的PV/T系统的可用能(Exergy)转换效率ηΣ,2nd均高于不带玻璃盖板的PV/T系统。 相似文献
18.
19.