Thermodynamic Analysis and Comparison of Two Novel Organic Rankine Systems based on Solar Loop Heat Pipe Evaporator
V.
Beygzadeh
Department of Mechanical Engineering, Faculty of Engineering, Urmia University of Technology, P.O. Box 57155-419, Band Road, Urmia, Iran
author
S.
Khalil Arya
Department of Mechanical Engineering, faculty of engineering, Urmia University, P.O. Box 165, 11km Sero Road, Urmia, Iran
author
I.
Mirzaee
Department of Mechanical Engineering, faculty of engineering, Urmia University, P.O. Box 165, 11km Sero Road, Urmia, Iran
author
G.
Miri
Department of Business Management, National Iranian Oil Refining & Distribution Company, P.O. Box 15815/3499, 4 Varsho Street, Tehran, Iran
author
V.
Zare
Department of Mechanical Engineering, Faculty of Engineering, Urmia University of Technology, P.O. Box 57155-419, Band Road, Urmia, Iran
author
text
article
2018
eng
A comprehensive thermodynamic analysis and performance comparison of two solar ORC systems for electricity generation is reported. Energy and exergy analyses are used to characterize the exergy destruction rate in any component and estimate solar ORC systems performance. The systems considered are solar ORC system with single stage turbine and solar ORC system with double stage turbine. A computer simulation program using EES software is developed to model the solar ORC systems. The solar ORC systems provide electricity during the hours of solar radiation. The analysis involves the specification of effects of varying ORC evaporators pinch point, varying ambient temperature and varying ORC turbines inlet pressure on the energetic and exergetic performance of the solar ORC systems. This study shows that the solar ORC system with double stage turbine has the higher performance. The results also showed that the main source of the exergy destruction is the solar loop heat pipe evaporator for both considered systems. Other main sources of exergy destruction are the ORC turbines; and the ORC evaporators for both considered systems.
Journal of Solar Energy Research
University of Tehran
2588-3097
3
v.
3
no.
2018
177
186
https://jser.ut.ac.ir/article_68641_00170d7cdf527d25d68f27b3220c5899.pdf
Thermodynamic Analysis of Using Parabolic Trough Solar Collectors for Power and Heating Generation at the Engineering Faculty of Urmia University in Iran
M.
Abdollahi Haghghi
Faculty of Mechanical Engineering, Urmia University, Urmia, Iran
author
S.M.
Pesteei
Faculty of Mechanical Engineering, Urmia University, Urmia, Iran
author
A.
Chitsaz
Faculty of Mechanical Engineering, Urmia University, Urmia, Iran
author
text
article
2018
eng
In the present paper, the energetic and exegetic analysis of using parabolic trough solar collectors (PTSC) subsystem with an organic Rankine cycle (ORC) at the engineering faculty of Urmia University that located in Nazlou regain as a case study is carried out. The task of this cycle is to provide the heating load and electrical power of the building. Firstly the energy demand of the building is calculated. Then, by considering the geographic location and weather conditions information of Nazlou, a cycle that fits with it, in three solar radiation modes is designed. These modes are the solar mode, the solar and storage mode, and the storage mode. According to results, total heating load and electrical power rate of the building are 1253.2 kW and 1500 kW, respectively. This energy demand can be provided by 250 and 500 number of PTSC in the solar mode and the solar and storage mode, respectively. PTSC outlet temperature and its efficiency during the year are between 470-660 K and 53-56%, respectively. Heating cogeneration and electrical power energy efficiencies in the first and third mode are around 95% and 15% and in the second mode are around 45% and 7.5%, respectively. Heating cogeneration, electrical power and ORC exergy efficiencies are around 18.5%, 9.5%, and 9% in the first and third mode, respectively. For second mode these values are around 9%, 4.5%, and 4%, respectively. Also, the major exergy destruction rate is occurred in the PTSC and ORC evaporator.
Journal of Solar Energy Research
University of Tehran
2588-3097
3
v.
3
no.
2018
187
200
https://jser.ut.ac.ir/article_68642_837b242199492f6753f3fa70d7fb1078.pdf
Electrification of a Tourist Village Using Hybrid Renewable Energy Systems, Sarakhiyeh in Iran
M.
Jahangiri
Department of Mechanical Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
author
A.
Haghani
Department of Mechanical Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
author
S.
Heidarian
Department of Mathematics, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
author
A.
Alidadi Shamsabadi
Young Researchers and Elite Club, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
author
L.M.
Pomares
Qatar Environment & Energy Research Institute, Hamad Bin Khalifa University, P.O. Box 5825, Doha, Qatar
author
text
article
2018
eng
Tourism paves the way for employment and income development in many countries. In southern provinces of Iran, especially Khuzestan, however, despite their high potential, tourism is only restricted to Nowruz (New Year) and there is no appropriate conditions for tourism. The development of suitable tourist infrastructures and construction of recreational places can terminate the Nowruz monopoly of tourism to witness the extensive presence of visitors at all times of the year. According to the above notes and in line with the construction of a tourist settlement in Sarakhiyeh village and noting that different scenarios of hybrid renewable energies have not been used to electrification of a tourist village in Iran so far, this paper uses HOMER to study the electrification of this village using renewable energies wind, solar, biomass, and fuel cell. The studied parameters are net present cost (NPC), cost of energy (COE), the surplus electricity produced and the emissions produced during the year. Results indicated that in the most cost-effective, which was related to the biomass/solar cell scenario with a price/kWh of $ 0.339, 49% of energy requirement was provided by solar cells which seemed reasonable given the high radiation potential of Khuzestan province. The result of this study can accelerate the development of Khuzestan and other southern provinces of Iran with similar climate conditions.
Journal of Solar Energy Research
University of Tehran
2588-3097
3
v.
3
no.
2018
201
211
https://jser.ut.ac.ir/article_68643_89e6602cdafd04a133f7350ea80b2bd7.pdf
Optimum Design of an Electrolytic Capacitor-less Grid-tied Solar Microinverter
M.
Akbari Nodehi
Department of Electrical Engineering, Faculty of Electrical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran
author
text
article
2018
eng
This paper studies two types of functions for single state Solar Micro Inverter connected to a network without Electrolyte Capacitor: Continuous and Discontinues. In order to recognize the advantages of both functions and to develop the Inverter for Photovoltaic applications connected to a decentralized network; those two functions are analysed and compared.The purpose of the optimum design of these structures is a micro-inverter with the smallest possible volume to deliver maximum power to the electricity network and extensive utilization of photovoltaic energy. Using electrolyte capacitor in usual structures of Micro-Inverter circuits will lead to decrease in life span of circuits. In order to remove electrolytic capacitor, circuit analysis methods can be used for energy storage. Using the Inverter function in boundary state led to decrease in tensions imposed on Inverter’s components compared to Discontinues state. Results of simulation in PSIM confirm the accuracy of analysis and designs done for 100 (W) Inverter with input DC voltage of 27 (V) and rms voltage 100 (V).
Journal of Solar Energy Research
University of Tehran
2588-3097
3
v.
3
no.
2018
213
220
https://jser.ut.ac.ir/article_68644_914f71c6b7aa99d07ba8154343162fd6.pdf
Vitaminized Dye-sensitized Solar Cell
F.
Mousavi
Faculty of Chemistry, Razi University, Kermanshah, Iran
author
M.
Shamsipur
Faculty of Chemistry, Razi University, Kermanshah, Iran
author
A.
Taherpour
Faculty of Chemistry, Razi University, Kermanshah, Iran
author
text
article
2018
eng
Gaining solar energy by the valence electrons of the dye molecules is the first motive force to rule a dye-sensitized solar cell (DSC). This admits the importance of the dye molecule and its features, from the electronic states till the absorbance and the functional groups, to anchor to the nanostructured semiconductor photoanode, attain solar energy and finally convert it into electricity. To this purpose, the current study introduces cyanocobalamin (B12 vitamin) to play this role in DSCs. From one side, density functional theory (DFT) reveals the energy of the highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO), and the bandgap of B12 vitamin as -7.4, -4.9, and 2.5 eV, respectively. On the other side, the experimental ultraviolet-visible (UV-Vis) spectroscopy on B12 solution represents its broad absorption spectrum in this region. These results show that the proposing dye perfectly matches the electronic domino of the DSC device. Furthermore, this study discloses the matching semiconductors, redox shuttles, and counter electrodes (CEs) to construct B12-vitaminized dye-sensitized solar cells.
Journal of Solar Energy Research
University of Tehran
2588-3097
3
v.
3
no.
2018
221
226
https://jser.ut.ac.ir/article_68645_68525d136d944915fc336809aa77a062.pdf
Experimental Energy and Exergy Analysis of a Flat Plate Solar Water Heater to Find Optimum Collector Mass Flow Rate
S.
Khanmohammadi
Department of Mechanical Engineering, Kermanshah University of Technology, Kermanshah, Iran
author
F.
Veysi
Department of Mechanical Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran
author
S.
Amini
Department of Mechanical Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran
author
text
article
2018
eng
This paper presents the experimental study of a flat plate solar collector to find the optimum flow rate of collector with variation of daily solar radiation intensity. The procedure of ASHRAE standard was used for testing the thermal performance of flat-plate solar collector. Results show that using optimal collector flow rate can improve energy and exergy efficiency of SWH. Furthermore, results show that in no load on storage tank overall energy efficiency can improve between 0.25 % and 7 %. In addition, calculations show an increment between 0.18 % and 1.12% for overall exergy efficiency. In the 36 L/h, and 52 L/h and 72 L/h thermal load on storage tank overall energy and exergy efficiency show a reasonable increment with using optimum flow rate of collector. Finally, these experimental analysis results can be a base for design a collector flow rate controller to have a more efficient SWH.
Journal of Solar Energy Research
University of Tehran
2588-3097
3
v.
3
no.
2018
227
236
https://jser.ut.ac.ir/article_68646_3ca465a96960bbdd49fe115053702546.pdf
Research in the Past, Present and Future Solar Electric Aircraft
F.
Mohammadi
Electrical and Computer Engineering Department, University of Windsor, ON N9B 1K3, Canada
author
text
article
2018
eng
Due to the increased use in vehicles that are operated by internal combustion (IC) engines, several challenges associated with climate change and global warming have appeared. The best alternative to face with those challenges is to use the vehicles which do not require fuels and IC engines. Electric vehicles are being well-designed, developed and produced to be more effective every day. In the field of aviation, new aircraft which run on full-electric-energy are being developed which is expected to change the conventional travel way. Those aircraft use batteries, ultra-capacitors, fuel-cells to drive motors which are connected to propellers. With the proper development in the field of electric aviation, the aforementioned issues can be reduced, and eventually mitigated. In this paper, the past developments in this field of electric aviation, present electric aircraft flying in the sky, and the future projects that are intended and/or projected to change the aviation industry are discussed. Also, the different designs associated with electric aircraft are discussed along with their advantages and disadvantages. This paper demonstrates the promising movements of the aviation industry toward the more reliable and efficient solar electric aircraft and reducing emissions.
Journal of Solar Energy Research
University of Tehran
2588-3097
3
v.
3
no.
2018
237
248
https://jser.ut.ac.ir/article_68648_1071e6850fb3d7baeab60f1541d437ad.pdf