فهرست مطالب

Journal of Solar Energy Research
Volume:3 Issue: 2, Spring 2018

  • تاریخ انتشار: 1397/01/12
  • تعداد عناوین: 8
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  • S. Samadzadeh *, A. Raoufpanah, E. Gholamian Pages 83-90
    The aim of this paper is to propose a solar based energy system for the provision of heating, electricity and fresh water. The proposed system in this study consists of four main parts: a geothermal based Organic Rankine cycle, a diesel engine, PVT panels and reverse osmosis desalination unit. The system is comprehensively studied from energy, exergy and exergoeconomic viewpoints. Accordingly, parametric study is performed to examine the influence of the effective parameters on the performance and economic indicators and also on the fresh water production. The results show that, by increasing the turbine inlet pressure, the fresh water prodcution rate would increase by 1.3 ton/day. Moreover, increasing the turbine inlet pressure can increase the total power output by around 800 kW. The exergoeconomic results indicate that increasing the mass flow rate of the geothermal brine increases the total cost rate by 200 $/h.
    Keywords: PVT, RO, diesel engine, ORC, exergoeconomic
  • V. Beygzadeh *, Sh. Khalil Arya, I. Mirzaee, Gh. Miri, V. Zare Pages 91-106
    A comprehensive energy and exergy analysis is reported of a novel solar thermal CHP system for three Operation modes. Energy and exergy analyses are used to characterize the exergy destruction rate in any ingredient and estimate solar thermal CHP cycle performance. The system comprising a solar loop heat pipe evaporator, an auxiliary pump, two ORC evaporators, two storage tanks, a storage pump, a storage heat exchanger, an ORC turbine, an electrical generator, a process heat exchanger, a regenerator, a domestic water preheater (ORC cycle condenser) and an ORC pump. A computer simulation program using EES software is developed to model the solar thermal CHP system. The solar thermal CHP system simultaneously provides heating and electricity during the summer. The analysis involves the specification of effects of varying ORC evaporator pinch point, varying ambient temperature and varying ORC turbine inlet pressure on the energetic and exergetic performance of the solar thermal CHP system for three operation modes. The performance parameters calculated are exergy destruction, energetic and exergetic efficiencies. The results showed that, for the solar and solar and storages operation modes, the main source of the exergy destruction is the solar loop heat pipe evaporator and the storage mode has maximum exergy efficiency and minimum exergy destruction rate.
    Keywords: Energy Efficiency, exergy efficiency, solar, RORC, CHP
  • SH. Sanni *, K. Mohammed Pages 107-114
    This study presents a RETScreen based economic analysis of switching from grid electricity to solar photovoltaic (PV) system for a medium sized residential building located in Ado ekiti, Nigeria. The building has an existing 2kW solar PV system in place. Input parameters in RETScreen included the solar energy resources, cost and financial data. Two cases were evaluated using the maximum unit price of electricity for a forecasted 10-year period as the cost of grid purchase. The first case considered 24hr availability of electricity from the grid and results show that the PV system has an equity payback period of 9.4 years with an internal rate of return (IRR) of 15.3%. The second case took into consideration the epileptic nature of grid electricity in Nigeria. This condition increased the equity payback period to 16 years and 7% IRR. This shows that a solar PV is more economically rewarding in location with reliable grid electricity and relatively cheap cost of electricity.
    Keywords: Equity payback, Grid electricity, Internal rate of return, renewable energy, RETScreen, Solar photovoltaic
  • M.M. Moghadasi * Pages 115-121
    The solar radiation received by earth surface is one of the most applicable parameter that is usable in hydrology, agriculture, architecture and passive houses , climatology and meteorological modeling. Many different experimental equations had been suggested by researchers to estimate this parameter in different climates. This study aimed to calibrate existing model and develop a new model for estimating global solar radiation data using commonly and available measured meteorological records such as two well-known solar radiation models Angstrom-Prescott and Allen were calibrated and eight new empirical global solar radiation models were developed. Three statistical parameters Root Mean Square Error (RMSE), Nash-Sutcliffe equation (NSE) and Mean Bias Error (MBE) have been used to estimate error and model validation. The results showed that, the value of RMSE, NSE, MBE and Rs2 for Rs3 model got the highest rank with 44.59, 43.36, -594.92 and 0.9933, respectively. All models were calibrated based on available meteorological data and sunshine hours and validated using daily measured solar radiation data in (2008–2015) at meterological station of Kermanshah city located at the west of iran.
    Keywords: Angstrom equation, Solar radiation, sunshine hours, Climatic data
  • P. Mazaheri Salehi *, D. Solyali Pages 123-133
    In recent years renewable energy i.e. wind and solar energy has received worldwide attention. The determination of the photovoltaic system is dependent on various factors mostly to cost, complexity and efficiency. One of the most interesting areas among the various research area in solar photovoltaic (PV) system is extracting maximum power from solar PV system. The maximum power point tracking (MPPT) is the control algorithm that adjusts the power interfaces automatically and produces the most power available. In this study, multiple maximum power point techniques for solar PV systems are presented. The MPPT methods are discussed as follows: tracking speed, algorithm complexity, dynamic tracking under partial shading condition and hardware implementation. A significant corresponding table has been presented at the end of this paper to simplify the classification of the different methods for practicing engineers as well as for new researchers.
    Keywords: MPPT, Solar cells, PV, Classical methods, Soft computing methods
  • S. Pahlavan, M. Jahangiri *, A. Alidadi Shamsabadi, A. Khechekhouche Pages 135-146
    According to the statistics announced by Algeria’s Ministry of Energy and Mine, residential and service sectors account for 40% of total energy consumption of the country of which a huge amount is dedicated to space heating and sanitary hot water. Therefore, using solar water heater (SWH) for providing a major part of this energy demand seems necessary in line with socio-economic development and continuous improvement of standards of living. Applications such as space and water heating are not well-developed in Algeria and no need to say that using energy management software packages is an excellent solution for enhancing management applications of energy development-based systems. Therefore current study uses TSOL and MeteoSyn software packages to investigate the potential of using SWHs for a residential apartment in 37 stations in Algeria. Results indicated that In Salah, Tamanrasset, and Adrar stations that respectively accounted for 85.6%, 81.2%, and 76,7% of total thermal demand provision were the most suitable ones for SWH usage. Also, given the results it can be observed that in case of using SWH in 37 stations, 150160 kWh of thermal energy for space heating and 99861 kWh for sanitary hot water is produced which, due to not using fossil fuels for generating this thermal energy, savings up to 56783 kg in CO2 emissions are obtainable annually.
    Keywords: Buffer tank, Heating load, Average daily consumption, Heated useable area
  • A. Ullah, S. Bangash *, S. Rahman Pages 147-153
    This paper intended to examine the impact of solar electrification on education attainment in rural areas of Bajaur Agency. The household survey was conducted by using a recall method for collecting the primary data through structured questionnaire. The data was analysed through regression model as well as through descriptive statistics. The solar energy has provided direct and indirect benefits to the plotted households in the study area of Bajaur Agency, Pakistan. The result reveals that, the study hours of students had increased after the installation of solar energy system. There was significant improvement in social activities which were earlier limited to day time. Moreover, a slight increase in income activities was also noticed due to increase in working hours. Thus, solar energy has improved the study hours and had a direct impact on human capital of the rural households. So, it is viable system and should be extended to such other inaccessible communities.
    Keywords: Solar energy, Education Attainment, Human capital, Study Hours, Rural Areas
  • M. Ouria *, S. Sayyah, A. Azami Pages 155-163
    In this paper, the features and types of lighting in different environments have been reviewed to highlight their effects on the biological human body. Secondly, strategies for domesticating healthy daylight in buildings and design of light sources have been graphically presented to define their critical zones. Next, the mechanism of body organs against light considered in different environments with different values. Finally, the rate of antidepressants consumption and average hours of sunlight per year in the most populous cities of twenty-one countries presented that shows an inverse relationship between antidepressants consumption and average hours of sunlight. Inappropriate lighting may harm physiological systems such as the visual, the nervous and the endocrine, the pineal, and the pituitary systems, as well as cardiac activity and skin conductance. It is noticeable that each problem creates or increases stress and depression. Natural daylight produces serotonin which is called the happiness hormone. Therefore, the rate of depression among residents of southern blocks, who absorb more daylight, is less than other blocks in winter. The most effective factor to obtain daylight and its pertinent quality is appropriate orientation. On the other hand, indoor lighting quality defines the level of visual comfort, which is measured and evaluated under the Relative Visual (RV) Performance model.
    Keywords: Natural Lighting Electromagnetic Spectrum, RVP, Biological Human Body, Stress