نتایج جستجو برای: solar energy frams

تعداد نتایج: 757545  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده مهندسی برق و کامپیوتر 1391

many mobile and off-grid devices include electronics and other electrical consumers like servo drives, which need a quite low supply power. since the price for photovoltaic modules drops continuously, photovoltaic power supply is interesting in more and more applications. in solar powered systems, a battery is needed to store energy for the night and cloudy periods. the power electronics of suc...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده برق و کامپیوتر 1392

abstract nowadaysphotovoltaic solar cells (pvs) areacknowledged the fastest growing energy technology in the word, however, they only account for only fraction of current global renewable energy capacity. it isrecognized that this incomplete market penetration has been largely a result of the technology’sexcessive cost. so researchers are trying to find innovative, economic way with theaim of ...

Journal: :محیط شناسی 0
سیدجمال فرج ا... حسینی دانشیار گروه ترویج وآموزش کشاورزی دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران، زهرا سلطانی کارشناس ارشد ترویج و آموزش کشاورزی دانشگاه آزاد اسلامی واحد بیرجند فرشته غیاثوند غیاثی استادیار دانشکدة کشاورزی دانشگاه آزاد اسلامی واحد تاکستان

pastures play an important role in protecting environment and ecosystems. unfortunately more than 40 percent of pasturess in the world have been destroyed and 20 percent of destroyed pastures are located in developing countries. application of solar energy could significantly contribute to preserving the pastures. the main purpose of this study was to examine the role of solar energy in protect...

Journal: :energy equipment and systems 2014
mohammad safari farshad torabi

passive solar systems such as solar chimneys need solar radiation in order to work. therefore, they cannot present stable natural ventilation when solar energy vanishes: to have a more robust and stable condition, solar energy should be stored during the day and released back during the night. phase change materials can save additional thermal energy during the day and release it during the nig...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - پژوهشکده فنی و مهندسی 1386

چکیده ندارد.

Journal: :international journal of advanced biological and biomedical research 2014
alireza dehghanpour farashah amir hossein halabian m. fallahpour

in recent decades, due to increasing prices of fossil fuels and environmental pollution resulting from the increased energy demand, researches on renewable energy sources have attracted lots of researcher’s attention. limited investing sources and environmental issues are important factors effecting electricity generation sector. minimizing costs and environmental damages are issues being consi...

Journal: :international journal of energy and environmental engineering 2011
sunday olayinka

in this study, estimation of global and diffuse solar radiations of selected cities in nigeria was carried out to assess the feasibility of solar energy utilization. the results of this work show the variation of direct and diffuse component of solar radiation in summer and winter months. the contribution of diffuse solar radiation is high during the monsoon months whereas sky conditions are cl...

Journal: :journal of optoelectronical nano structures 0
sayed mohammad sadegh hashemi nassab department ofelectrical engineering, fasa branch, islamic azad university, fasa, iran. mohsen imanieh department ofelectrical engineering, fasa branch, islamic azad university, fasa, iran. abbas kamaly department ofelectrical engineering, fasa branch, islamic azad university, fasa, iran.

the main problemswith the use of fossil fuels is the restrictions on their access and the detrimental consequences of their use which causes a threat to human health and quality of life. consequently, the use of other energy sources has become necessary. renewable energy as a permanent and clean energy source is an answer to this problem. one such energy source includes photovoltaic solar energ...

Journal: :energy equipment and systems 0
alireza noorpoor graduate faculty of environment, university of tehran, tehran, iran parisa heidarnejad graduate faculty of environment, university of tehran, tehran, iran nasim hashemian graduate faculty of environment, university of tehran, tehran, iran amir ghasemi graduate faculty of environment, university of tehran, tehran, iran

integrated energy systems utilizing renewable sources are sustainable and environmentally substitutes for conventional fossil-fired energy systems. a new multigeneration plant with two inputs, such as biomass and solar energy, and four useful outputs, such as cooling, heating, power, and distilled water, is presented and investigated in this paper. the proposed system includes evacuated tube so...

Journal: :international journal of nano dimension 0
sh. delfani department of installations, building and housing research center (bhrc), tehran, po box 13145-1696, iran. m. karami school of mechanical engineering, college of engineering, university of tehran, tehran, po box 14395-515, iran. m. a. akhavan bahabadi school of mechanical engineering, college of engineering, university of tehran, tehran, po box 14395-515, iran.

in the present work, a prototype of a new type of solar collectors, which called direct absorption solar collector, was built and its thermal performance is experimentally compared with conventional flat plate solar collector under transient and steady state conditions. different volume fractions of multi wall carbon nanotubes in water and ethylene glycol mixture (70%:30% in volume) were used a...

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