共查询到18条相似文献,搜索用时 328 毫秒
1.
2.
太阳能集热器工度的优化计算 总被引:1,自引:0,他引:1
依据槽形抛物镜-管簇结构腔体式吸收器太阳能集热器的热阻网络和建立的集热器Yung效率优化模型,以工作介质比热为参变量,计算了集热器长度的最优设计值。 相似文献
3.
介绍太阳能直供毛细管辐射供暖系统的原理、组成和流程。利用TRNSYS软件建立系统瞬时仿真模型,在通过实际测试验证模型准确可靠的前提下,更改建筑模型参数得出天津地区太阳能集热面积与供暖面积之比与建筑物的耗热量指标的对应关系,得到低能耗建筑的耗热量指标对应的太阳能集热面积与供暖面积之比。在太阳能直供毛细管辐射供暖系统的太阳能保证率达到100%,太阳能集热器集热效率为45%,建筑物耗热量指标在9.5 W/m2左右,供暖室内设计温度为18℃的条件下,1 m2的太阳能集热器面积可以负担4 m2的建筑面积的供暖负荷。 相似文献
4.
为了提升太阳能在建筑能源供给体系中的比重,形式多样的太阳能集热设备及其系统在建筑领域得到了广泛应用。基于机理分析法,建立了具有单层玻璃盖板的管板式太阳能平板集热器的稳态传热模型。并且针对集热管间距、集热管内径、工质入口温度和工质质量流量等关键参数对集热器集热效率的影响特性进行了数值模拟与分析。结果表明,建立的该稳态传热模型是可行的;此外,在其余参数值保持不变的情况下,减小集热管间距或增加集热管内径均可使集热器瞬时效率增大;增大工质入口温度会导致集热器瞬时效率下降;而增大工质质量流量会提升集热器瞬时效率。这些结论对于太阳能平板集热器在太阳能建筑一体化的实际应用中,具有一定的参考作用。 相似文献
5.
6.
7.
8.
9.
10.
《Planning》2014,(4):12-14
作为最常用的一类平板型空气集热器,V型波纹吸热板空气集热器近年来被广泛应用和研究.采用相同几何尺寸(长2m,宽1m)的波形板,构成四种不同流道的交叉V型吸热板-底板太阳能空气集热器,应用太阳载荷模型,利用FLUENT软件,对集热器在倾角为30°,入口空气流量为60m3/h的工况进行了三维数值模拟,得到集热器不同位置的温度场、吸热板中心宽度0.5m处的平均努赛尔数和瞬时效率,并对其进行了对比分析,得出空气集热器的V型吸热板横向放置、底板纵向放置结构的瞬时效率最高. 相似文献
11.
12.
文章介绍了带有相变蓄热水箱的太阳能热泵系统的运行实验。该系统是在原有的太阳能一土壤源热泵的基础上通过增加一个蓄热装置建立起来,包含太阳能集热器、相变蓄热水箱、双热源(太阳能和土壤)热泵以及末端装置(风机盘管)四个主要部分实验在供暖期末期进行,在整个实验阶段,系统供暖满足率为0.6,平均供热COP达到6.5。 相似文献
13.
14.
Thermal performance analysis of the glass evacuated tube solar collector with U-tube 总被引:1,自引:0,他引:1
In this paper, based on the energy balance for the glass evacuated tube solar collector with U-tube, the thermal performance of the individual glass evacuated tube solar collector is investigated by analytical method. The solar collector considered in this study is a two-layered glass evacuated tube, and the absorber film is deposited in the outer surface of the absorber tube. The heat loss coefficient and heat efficiency factor are analyzed using one-dimensional analytical solution. And the influence of air layer between the absorber tube and the copper fin on the heat efficiency is also studied. The results show that the function relation of the heat loss coefficient of the glass evacuated tube solar collector with temperature difference between the absorbing coating surface and the ambient air is nonlinear. In the different ambient temperatures, the heat loss coefficient of the solar collector should be calculated by different expressions. The heat efficiency factor will be subject to influence of air layer between absorber tube and the copper fin. Specially, the influence is remarkable when the heat loss coefficient of the collector is large. When the synthetical conductance amounts to 5 W/m K, the solar collector efficiency decreases 10%, and the outlet fluid temperature decreases 16% compared with the case which the air thermal resistance is neglected. And the surface temperature of the absorbing coating increases 30 °C due to the effect of air thermal resistance. So the surface temperature of the absorbing coating is an important parameter to evaluate the thermal performance of the glass evacuated tube solar collector. 相似文献
15.
被动式太阳房的围护结构既是收集太阳能的集热器,又是蓄热器和散热器,是一种方便、节约的采暖方式,但是太阳房集热效率较低也给其推广造成了一定的负面影响。经对某小学校舍进行研究后认为,只要选用科学合理的集热方式和构造措施,提高太阳房的集热效率,改善保温性能,减少热量消耗,加强维护,可以使太阳房的供暖效率得到大幅度提高。 相似文献
16.
The overall thermal performance of a solar water heating (SWH) system is significantly affected by the mismatch between the temporal distribution of solar radiation and the heating load. Therefore, a favorable correlation between the collector and storage size should be generated based on the dynamic characteristics of the system. This study focuses on the optimal matching of solar collector area with storage volume for an SWH system (with short-term heat storage capability) for a space heating application. A simplified model of an SWH system based on hourly energy flow is established. System control strategy is integrated into the model in a simple manner without sacrificing computing speed. Based on this model, the combined effect of collector area and storage volume on system thermal performance and economy is analyzed, and a simple procedure for determining the optimal system size is illustrated. A case study showed that for an SWH system utilized for space heating application, the optimized ratio between storage volume and collector area is dependent on the total collector area of the system, and is dominated by the requirement of overheating prevention. The minimum storage volume for a specific collector area that can prevent the storage tank from being overheated can be adopted as the optimum storage volume for that collector area. The optimum ratio between storage volume and collector area increases as the collector area increases. Therefore, a trade-off between heat collection and heat loss has to be made while attempting to increase solar fraction by improving collector area. 相似文献
17.
简要介绍了北美目前最大的跨季太阳能储存项目——加拿大0kotoks小镇的太阳能小区建设,对其太阳能供热系统的工作原理及利用土壤床作为储能体进行大规模跨季节太阳能储存的方法进行了分析。该项目根据不同季节可利用太阳能数量的不同,分别设置了短期(临时)太阳能储箱(STTS)及跨季节太阳能储存箱(BTES),以提高太阳能的利用率。其中,BTES的效率可达50%以上。小区太阳能家用热水系统(DWH)可满足住户60%的热水需求,而太阳能采暖系统则可满足90%采暖要求;建成后每幢住宅每年可减排5t温室气体,整个小区可减排260t/年。 相似文献
18.
结合西宁地区的气象资料,计算太阳能系统集热量与建筑热负荷之间的相对关系;并分析太阳能热泵为热源的地板辐射供暖系统在实际应用中的可行性.提出利用建筑消防水池作为太阳能热泵为热源的地板辐射供暖系统蓄热水池的一些现点. 相似文献