共查询到19条相似文献，搜索用时 187 毫秒
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太阳能热水器倾角的设计方案 总被引：3，自引：0，他引：3
通过研究太阳能热水器倾角与热效率的关系,运用光学定律,几何知识,首先计算出太阳能热水器的最优倾角.其次设计合理的太阳能热水器的倾角以解决用户夏天热水用不完,冬天热水又不够用的实际问题.最后确定了一年调节两次热水器倾角的最佳时间.此研究方案可以解决不同地区不同日期不同情况下的太阳能热水器倾角的设计. 相似文献
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徐婧 《江苏广播电视大学学报》2012,23(5):56-58
对于固定式太阳电池方阵,不同倾角直接影响到太阳能电池方阵接收到的太阳辐射量。为使光伏方阵效率最大化,需要对太阳能光伏电板的倾角进行设计及优化,选择太阳电池方阵的最佳倾角。在前人的简化模型基础上提出更精确的太阳能光伏电池板倾角优化算法,并在使用《天文算法》中的复杂算法得出的高精度太阳位置的基础上自建模型加入晴雨时长系数修正,通过对直接辐射时长的比较提高算法精度。实践证明,经过优化的方法为太阳能设备效率优化提高了精确度。 相似文献
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《赤峰学院学报(自然科学版)》2016,(17)
为促进可再生能源的发展,对严寒地区某示范工程进行土壤源热泵-太阳能供能系统进行设计,得出所需的太阳能集热面积.与传统常规能源系统相比,计算出本示范工程土壤源热泵-太阳能供能系统中太阳能集热系统的年节能量和因节省常规能源而减少的二氧化碳、烟尘、二氧化硫和氮氧化物排放量.可见,严寒地区土壤源热泵系统采用太阳能集热系统进行补热具有很高的节能和环保效益. 相似文献
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光伏发电作为充分利用太阳能的一种有效方式,其功率调节、电能质量、电压稳定和无功补偿问题一直是研究人员关注的焦点。为了充分利用太阳能资源,使光伏发电系统输出最大功率,一方面根据地理和气象信息通过物理跟踪时期使光伏阵列工作在最佳的朝向和倾角;另一方面通过对光伏阵列工作点电压的调节使其工作在最大功率点。 相似文献
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以刚察县扎苏合10 MW光伏电站为例,给出固定可调式支架的结构形式,并根据光伏电站所在地的全年光照情况,将全年时间分成若干段,计算出固定时间段内发电量最大的电池板倾角。得到按季节调整的最优角度为10°、28°、52°、62°,并分析不同角度下太阳能支架结构的受力情况。结果表明,固定可调式支架在不同倾角情况下,中间立柱与横梁连接处需加强处理。建议青海省新建光伏电站中采用固定可调式支架,对太阳能电波板的倾角进行月调、季调或半年调。 相似文献
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风能和太阳能都是安全可靠的可再生能源。现在大多采用风光互补发电系统,结合太阳能发电和风力发电的优点进行互补发电。尽管如此,在多数地区仍有发电量与用电量错峰的情况,比如受天气影响,太阳能和风能发电可能在某些时段达到高峰,某些时段跌入低谷。但是该地区的工业生产用电和百姓生活用电产生的耗电量可能刚好与此相反。在一些自然环境恶劣的地区,电力供应也不稳定。这其实可以采用重力储能技术解决。 相似文献
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《家用空气源热泵辅助型太阳能热水系统技术条件》中对整机综合制热性能系数（COP）试验的平均环境温度和全天太阳能辐照量给出了一定变化范围,为研究这一变化对整机综合COP的影响,将整机的性能试验分两个阶段进行,其中太阳能热水系统加热段在户外进行,空气源热泵加热段在环境温度可控的环境试验室进行。试验表明在标准规定的变化范围内,平均环境温度的变化及全天辐照量的变化对空气源热泵辅助太阳能热水系统整机综合COP有较大影响．其中因平均环境温度的变化及全天辐照量的变化对太阳能热水系统性能影响而引起整机综合COP的变化较小．而因平均环境温度的变化对空气源热泵性能的影响而引起整机综合COP的变化最大可达40％左右。据此对该标准的试验方法、试验条件提出了修改建议。 相似文献
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根据太阳运动轨迹,结合集热器盖板的辐射传输理论,在地平坐标系内建立太阳光动态入射矢量与半透明介质的一体化光束传输模型。研究结果表明,夏季建筑南墙整日太阳照射强度弱,而西墙下午太阳照射强且时间长;集热器月阶段性最佳倾角约为当地纬度与该月太阳赤纬之差,年均最佳倾斜角约为当地纬度值（福州26°）。 相似文献
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It is promising to simultaneously develop multiple products through the combined utilization of sea-water by solar chimney technology. A small scale experimental system was set up. The collector temperature, the seawater temperature, and the temperature and humidity of the airflow under the collector were measured. Thermal network analysis of the system was carried out. The results show that the airflow is nearly saturated at the entrance of the chimney, and the mean dry-bulb and wet-bulb temperatures of the airflow have increased by 8.4℃ and 9.6℃ respectively. The radiation heat transfer between the collector and the sky is the biggest heat loss in the system, which is up to 29.1% on average of the solar energy. However, the water evaporation heat is about 23.6% on average of the solar energy. To reduce the heat loss and enhance the water evaporation, it is necessary to reduce the emissivity and thermal conductivity of the collector and increase the evaporation areas. 相似文献
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The charging characteristics of the valve-regulated lead acid (VRLA) battery driven by solar energy were experimentally studied
through the pressure-control method in this paper. The aims of the research were to increase charging efficiency to make the
most of solar energy and to improve charging quality to prolong life of battery. The charging process of a 12 V 12 A·h VRLA
battery has been tested under the mode of a stand-alone photovoltaic (PV) system. Results show that the pressure-control method
can effectively control PV charging of the VRLA battery and make the best of PV cells through the maximum power point tracking
(MPPT). The damage of VRLA battery by excess oxygen accumulation can be avoided through the inner pressure control of VRLA
battery. Parameters such as solar radiation intensity, charging power, inner pressure of the battery, and charging current
and voltage during the charging process were measured and analyzed. 相似文献
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用分子动力理论导出了辐射场施于静止帆和运动帆的压强,并从动力学观点讨论了辐射场与帆之间的能量转换效率,同时指出了文[1]存在的一些问题. 相似文献
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目前,世界正在面临寻找替代能源以减少对常规能源的依赖,太阳能便是一个很好的解决方案。但是太阳能辐射强度和环境温度对太阳能电池技术参数和输出特性有很大影响,这里采用了太阳能电池的实用化的工程数学模型,在Matlab/Simulink的仿真系统中,建立了太阳能电池阵列的仿真模型,便于运用到太阳能的开发研究工作中。 相似文献
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根据广州1市2007-2011年的逐日太阳辐射和日照时间观测数据,对广州市的月太阳总辐射、散射辐射、水平面直射辐射以及每月日最大总辐射辐照度历年平均值进行了计算。分析了广州市太阳辐射量的变化特征,根据Angstrom—Prescott模型,推导出了太阳总辐射月均值及日值的估算经验公式,对所得到的经验公式运用平均百分误差、平均偏差、均方根误差进行了误差分析,结果表明能满足工程应用的要求。 相似文献
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With rising standards of living, the per capita energy consumption is increasing rapidly all over the world. The limited reserves of fossil fuels may be exhausted by the middle of the next century. This crisis situation has forced technologists to turn to alternate sources of energy, like wind energy, ocean thermal energy and solar energy. All the above forms of energy are indirectly derived from solar energy. In this article a short account of the amount of solar radiation reaching the earth, its spectral distribution and its interaction with the earth’s atmosphere is presented. A brief discussion is given on hydro-power, wind-power and ocean thermal energy conversion as indirect techniques of utilization of solar energy. Solar energy can also be directly converted into heat and electricity. Techniques for such direct conversion, with special reference to photovoltaic generation of electricity, are also described in this article. 相似文献
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A. K. Shukla 《Resonance》2006,11(7):42-50
The intensity of solar radiation in the Earth’s direction from the Sun is approximately 1353 kW/m2, a number also called the ‘solar constant’. Accordingly, it is estimated that Earth receives about 96 billion kilowatts from
the Sun each second. If this colossal and unlimited energy could be more fully utilized, our dependence on fast dwindling
fossil cache will be drastically reduced. Solar energy is available in various forms such as direct solar radiation, wind,
wave power, rain (in the form of hydropower), photosynthesis and ocean thermal gradients. Among these, the direct conversion
of sunlight into electricity is clean and attractive. This article highlights various routes to directly harness electricity
from sunlight.
An erratum to this article is available at . 相似文献
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A. K. Shukla 《Resonance》2011,16(12):1294-1302
The intensity of solar radiation in the Earth’s direction from the Sun is approximately 1.361 kW/m2, a number also called the ‘solar constant’. Accordingly, it is estimated that the power Earth receives is about 96 billion
kilowatts from the Sun each second. If this colossal and unlimited energy could be more fully utilized, our dependence on
fast dwindling fossil cache will be drastically reduced. Solar energy is available in various forms such as direct solar radiation,
wind, wave power, rain (in the form of hydropower), photosynthesis and ocean thermal gradients. Among these, the direct conversion
of sunlight into electricity is clean and attractive. This article highlights various routes to directly harness electricity
from sunlight. 相似文献