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30m~2槽式太阳能集热器性能模拟研究 总被引:2,自引:0,他引:2
本文针对30 m~2槽式太阳能集热试验装置,对太阳能集热器的性能进行了模拟。分析了太阳能集热器光热转化过程,建立了太阳能能量转换与传递模型,并开发了模拟计算程序,研究了集热器关键结构参数和运行参数对集热性能的影响规律。具体考察了太阳辐照强度、工质流量、环境风速、吸热管管径等对集热效率的影响。结果表明:太阳能集热器的集热效率随太阳辐照强度的增加而增大,随工质流量的增加而增大,存在最佳的吸热管管径使得集热效率最大。研究结果将为太阳能集热器的设计提供参考依据。 相似文献
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集管系统在各类换热系统中具有广泛的运用,支管流量分配不均是集管系统的基本问题,流量分配不均对集管系统泵功消耗有较大的影响,因此集管系统内部流量分配的准确预测及优化至关重要。本文以常见的平板太阳能集热器为研究对象分析集管系统流量分布不均的问题,应用经典流体力学公式,通过连续性方程、能量守恒及动量守恒定律建立系统内部压力、流动阻力以及流量分配通用数学模型,编写C程序数值求解集热器系统压力与流量的分布规律并进行实验验证,结果表明:通过建立流量分配模型可以准确预测集管系统内的流动状况。集热器系统压力流量分布的理论预测模型具有广泛的适用性,对预测工业锅炉系统、太阳能集热系统及各种集管系统的流动阻力、流量分配及压力分布具有重要的借鉴意义。 相似文献
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太阳能与冷热电联产系统集成 总被引:1,自引:0,他引:1
本文研究太阳能与冷热电联产系统集成,增加槽式太阳能集热器,利用中低温太阳能.在相对节能率的基础上提出全年相对节能率,并采用全年相对节能率评价新系统,用以确定最佳太阳能集热器面积.用软件Aspen Plus模拟流程,装机容量275 kW时,太阳能集热器面积增加,新系统的全年相对节能率先增加后减少,最大全年节能率值为32.7%,而常规系统的全年节能率为30.7%,新系统较常规系统的全年节能率相对提高了6.5%,最佳太阳能集热面积为350 m2.对于不同装机容量,设计最佳太阳能集热器面积;对于同一装机容量,讨论太阳辐射强度及日照时间对最佳太阳能集热面积的影响. 相似文献
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《工程热物理学报》2021,42(8):2048-2059
针对太阳能供暖系统占地面积大、高寒地区供暖效果不稳定情况,本文利用TRNSYS搭建实验系统仿真模型,以空气源热泵或电加热作为辅助热源进行对比分析与优化。系统能耗、辅热量与房间热舒适性设定为目标值,通过响应曲面法分析集热器面积、集热器倾角及供暖循环泵流量等对目标值的影响,从而对工况进行优化。太阳能与空气源热泵互补供暖系统最优工况为:集热倾角43.71°、空气源热泵功率6.47 kW、供暖泵流量4.08 m~3/h;对应目标值能耗4799.11 kWh、热泵辅助加热量16953.3 kWh、PPD_19.84%、PPD_2 9.62%。太阳能与电加热互补供暖系统最优工况为:集热倾角50°、电加热功率25.77kW、供暖泵流量6 m~3/h;对应目标值能耗18075.6 kWh、电加热辅助加热量17698.75 kWh、PPD_1 9.62%、PPD2 9.35%。经对比分析可知太阳能与空气源热泵互补供暖在高寒地区更具优势。 相似文献
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文中通过对变频控制直接膨胀式太阳能热泵的数值模拟,指出PV/T- SAHP系统实现变频控制从而解决太阳能热泵集热器面积与压缩机的容量不匹配的关键问题是找到系统集热/蒸发器的MSS线.为变工况下太阳能热泵系统的研究提供参考. 相似文献
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《工程热物理学报》2020,(8)
针对呼和浩特地区太阳能毛细管网供暖系统运行特性,搭建了太阳能毛细管网供暖系统,对系统进行理论与实验研究,测试该系统对室内热环境的影响。研究结果表明:在较为晴朗的天气情况下,太阳能集热器典型日平均集热功率为7.12 kW、集热效率为50.5%。储热水箱保温效果良好的情况下,毛细管供暖系统在典型日平均供暖效率为38.9%。毛细管网供暖房间室内早晚温差较大,导致各层温度分布较不均匀;相较于室外环境与未供暖房间,平均温度分别提高了16.68℃和8.84℃。通过房间热舒适性分析,多数时间室内具有较好的热舒适性,但在中午时间段内需根据情况进行适当的流量调节。该研究为太阳能毛细管网系统在高寒地区推广应用提供了研究基础。 相似文献
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P. J. Pigram R. N. Lamb B. J. Wood R. E. Collins 《Applied Physics A: Materials Science & Processing》1991,52(2):145-150
The composition of a reactively sputtered graded stainless steel/carbon cermet with a copper base layer has been studied using Auger electron spectroscopy/argon ion depth profiling and X-ray photoelectron spectroscopy. The interlayer structure of newly deposited films is independent of the underlying substrate but exhibits strong substrate interactions following baking at 670K for 60 min. Similar behaviour is found in films aged in air at room temperature over a period of months. Metal oxide substrates are most reactive, causing oxidation within the film. This type of multilayer cermet is used in solar collectors as a spectrally selective film. The implications of these findings for the long term integrity and performance of the thermal solar collectors are discussed. 相似文献
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Yu. P. Rylov 《Technical Physics》2003,48(11):1480-1485
The cheapening of solar energy reception and concentration is of primary importance for its effective use. Conventional preformed parabolic reflectors are too bulky and heavy for the shape of their surface to be maintained by load-bearing frameworks. The fabrication of elastically deformed thin-film or thin-sheet reflectors is considered in terms of the classical elasticity theory. It is shown that the solar energy concentration ratio achievable in receivers made by this technology is comparable to that in present-day collectors used in solar power plants; however, collectors made by the new technology may be much cheaper. 相似文献
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In this paper the performances of inhomogeneous dielectric slabs as solar light collectors for both illumination and solar energy applications are analysed. 相似文献
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This work presents an experimental study of the thermal-hydraulic characteristics in a flat-plate solar collector with two different geometries of helical coil inserts. Isothermal pressure drop tests are conducted in a horizontal tube using water as working fluid to obtain the fully developed Fanning friction factor for a range of Reynolds number Re = 80–8,000. Heat transfer tests are performed in the solar collector loop using a mixture of propylene-glycol and water at 30 wt%, covering the ranges Pr = 16–28 and Re = 140–600. A significant decrease in the temperature of the absorber is observed when the appropriate wire coil is selected for the given flow conditions, proving the beneficial effect of this type of insert device for the augmentation of the thermal efficiency in flat-plate solar collectors. 相似文献
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Parabolic trough collectors generate thermal energy from solar energy. Especially, they are very convenient for applications in high temperature solar power systems. To determine the design parameters, parabolic trough collectors must be analysed with optical analysis. In addition, thermodynamics (energy and exergy) analysis in the development of an energy efficient system must be achieved. Solar radiation passes through Earth's atmosphere until it reaches on Earth's surface and is focused from the parabolic trough collector to the tube receiver with a transparent insulated envelope. A11 of them constitute a complex mechanism. We investigate the geometry of parabolic trough reflector and characteristics of solar radiation to the reflecting surface through Earth's atmosphere, and calculate the collecting totM energy in the receiver. The parabolic trough collector, of which design parameters are given, is analysed in regard to the energy and exergy analysis considering the meteorological specification in May, June, July and August in 1sparta/TUrkey, and the results are presented. 相似文献
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太阳能强化自然通风理论分析及其在生态建筑中的应用 总被引:11,自引:0,他引:11
生态建筑作为建筑节能的一个全新设计理念,旨在最大限度地利用风能、太阳能等自然能源,削减不可再生能源的耗费。将太阳能烟囱、Trombe墙以及太阳能空气集热器等构件与生态建筑一体化设计安装能够取得较好的效果。本文以太阳能烟囱为例对太阳能强化自然通风的原理进行了理论分析与模拟计算。同时,介绍了较为典型的三种太阳能强化自然通风的复合能量系统。 相似文献