ORIGINAL_ARTICLE
Climatic Design of a Residential Villa and Finding Suitable Solar Heating Technology to Meet Thermal Needs in the Cold Climate of Iran
The aim of the present work is to make maximum use of environmental potentials in order to save energy consumption and increase the quality of comfort in residential space through the design of buildings in accordance with the cold climate in Iran. Also, providing part of the heat needs of the building under study by solar energy is another way to reduce energy consumption. According to studies, and despite the fact that Iran has a high potential to use solar energy, so far no studies have been conducted on the climatic design of residential villas in cold climates with the approach of using solar water heaters. Also, the study of six different solar technologies to find the optimal system and also the one-year dynamic analysis of the optimal system are other innovations of the present work. In the present work, initially, with the help of the recommendations provided by Climate Consultant 5.5 software, a residential villa has been designed in accordance with the cold climate of Iran. Then, using TSOL 5.5 software, six systems based on solar heating and boiler have been examined to meet the thermal needs of the villa. After finding the optimal heating system, a one-year dynamic analysis was performed on it. By examining the climatic parameters, the strategies needed to ensure the comfort of the residents were implemented on a psychometric chart. The orientation of the building, the depression in the ground, etc. were among the suggestions to make the design of the villa compatible with the climate. The results of reviewing six solar heating systems showed that the solar system, including a hybrid tank with an internal heat exchanger, with the lowest number of collectors, had the highest heat efficiency and was able to provide 41.5% of the annual heat required by the villa.
https://jser.ut.ac.ir/article_83119_afee03e8569d9a8b551ed0d8940a7977.pdf
2021-10-01
865
882
10.22059/jser.2021.312996.1183
climatic design
Domestic hot water
Space heating
SWH
TSOL software
Maryam
Khalili
m.khalili@iaushk.ac.ir
1
Department of Mechanical Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
LEAD_AUTHOR
ORIGINAL_ARTICLE
Solar Panel Efficiency Enhancement Using Water Filter
Efficiency reduction of photovoltaic cells caused by increasing temperature, is an important issue that restricts their use in the middle of the day especially in summer. A new cost-effective method to increase the solar cell efficiency is presented to alleviate the problem. A combination of 40 fiberglass small cells are used in the form of a panel to perform the experimental tests. Water is used as absorbent of heat to reduce high temperature effects on the panel and the test results show that the panel efficiency is increased using the suggested method by amount of at least 16.8%. A 300W halogen lamp is regarded as the light source throughout the experiments.
https://jser.ut.ac.ir/article_83126_3067052f2587b37d9d9ce22799245083.pdf
2021-10-01
883
886
10.22059/jser.2020.298493.1143
solar cell
Efficiency
solar panel
photovoltaic cell
Hadiseh
Babazadeh
h.babazadeh@uut.ac.ir
1
Faculty of Electrical Engineering, Urmia University of Technology, Urmia, Iran
LEAD_AUTHOR
Sobhan
Javan
sobhanjvn@gmail.com
2
Faculty of Electrical Engineering, Urmia University of Technology, Urmia, Iran
AUTHOR
ORIGINAL_ARTICLE
The Influence of the Geographical Location on the Preventive Replacement of Renewable Energy Devices
In this article- we study devices that derive energy from natural process (sun, wind, winter, soil, etc.) and that are replenished constantly such as fans generating electric power and solar energy devices. However, all devices are exposed to damage over time resulting in the accumulation of the damage caused by climatic fluctuations (Every geographical area is characterized by bad weather characteristics that leave damage to the device; like wind, rain and humidity) that lead to the failure of the device. These devices receive energy directly from nature in order to supply it to other systems (mechanical, electrical, etc.). A failure of the device reduces electrical-mechanical production. The companies manufacture renewable energy devices and export them to other countries in various geographical locations. The devices are used to provide electrical current in these countries. These companies seek to develop long-term protection plans against the device failure. A failed device becomes ineligible even for recycling in these companies. Therefore, the cost of the device failure and forced replacement becomes too expensive for these companies. Because of this, companies tend to find the optimal time to replace the device shortly before failure to reduce the cost of failure. In this experiment we study a device that is subject to shocks and calculate the optimal time for preventive replacement of a said device. As an example a solar energy device exposed to shocks resulting from climate fluctuations. We place this device in three different geographical locations (desert, tropical, and temperate), and calculate the optimal time for preventive replacement of the device. Finally, the results from these three locations are compared.
https://jser.ut.ac.ir/article_83149_9b5e1964014c5dcd5d8e45ff02d862de.pdf
2021-10-01
887
897
10.22059/jser.2021.312136.1179
Preventive replacement
compulsory replacement
solar energy devices
tolerance limit
climate fluctuations
Ali
Ezzedine
al_ez661@mail.um.ac.ir
1
1Department of Statistics, Faculty of Mathematical Sciences, Ferdowsi University of Mashhad, Iran
LEAD_AUTHOR
Abdolhamid
Rezaei Roknabadi
rezaei@um.ac.ir
2
Department of Statistics, Faculty of Mathematical Sciences, Ferdowsi University of Mashhad, Iran
AUTHOR
Gholam Reza
Mohtashami Borzadaran
grmohtashami@um.ac.ir
3
Department of Statistics, Faculty of Mathematical Sciences, Ferdowsi University of Mashhad, Iran
AUTHOR
ORIGINAL_ARTICLE
Control of Three-Phase Buck-Type Dynamic Capacitor Using the Model Predictive Control Method for Dynamic Compensation of the Reactive Power and Load Current Harmonics
Dynamic capacitor (DCAP), as a shunt power quality device, corrects the power factor of the load and reduces the total harmonic distortion (THD) of the source current. A novel control method was presented based on the model predictive control (MPC) to control a three-phase three-wire buck-type DCAP. The injected current of DCAP is the control variable, which must be controlled by two power electronic switches of DCAP. MPC controller minimized the absolute value of the difference between a reference current and a DCAP current in the prediction horizon. The reference current consisted of two distinct parts, i.e., reactive power compensator (RPC), and harmonic current eliminator (HCE), based on the fundamental component of the load current. Also, a prediction model (PM) was proposed to calculate state variables of the DCAP based on their previous values, state of the switches, and prediction values of the grid voltage. The proposed PM was extracted from the linearized differential equations of the DCAP. All DCAP components, such as capacitors and inductors of the inner and outer filters, were modeled in the proposed PM. Unlike the PI controller, the proposed MPC has fewer control parameters and can use in extensive operational conditions. The simulation results in MATLAB software showed the superiority of the proposed method compared with the even harmonic modulation (EHM) method on a three-phase DCAP.
https://jser.ut.ac.ir/article_83232_9c803b77489350b3e3e0546f5fd434c9.pdf
2021-10-01
898
912
10.22059/jser.2021.313910.1185
Buck-Type Dynamic Capacitor (DCAP)
Model Predictive Control (MPC)
Reactive Power Compensator (RPC)
Harmonic Current Eliminator (HCE)
Vahid
Soori
soori_vahid@yahoo.com
1
Department of Electrical Engineering, University of Kashan, Kashan, Iran
AUTHOR
Abbas
Ketabi
aketabi@kashanu.ac.ir
2
Department of Electrical Engineering, University of Kashan, Kashan, Iran
LEAD_AUTHOR
Abolfazl
Halvaei Niasera
halvaei@kashanu.ac.ir
3
Department of Electrical Engineering, University of Kashan, Kashan, Iran
AUTHOR
ORIGINAL_ARTICLE
Assessment of wet compression integrated with air-film blade cooling in gas turbine power plants
The output power, energy, and exergy efficiencies of gas turbines significantly decrease by rising ambient temperatures during the warm weather periods. The utilization of evaporative inlet cooling in gas turbine cycles increases its performance, which is extremely useful when trying to meet the increasing electrical power demands and offsetting shortages during peak load times, especially in these warm periods. With this mind the present study focuses on the thermodynamics of a gas turbine equipped with wet compression system and integrated with air-film blade cooling, to address the importance gas turbine efficiency. The results of the investigated basic and modified cycles presents that for a turbine inlet temperature of 1400 oC, an ambient temperature of 45 oC, and a relative humidity of 15%, adding an evaporative cooler to a simple gas turbine cycle leads to an approximate 21% increase in specific work, from 331 to 273.7 kJ/kg air, compared to the simple cycle. The exergy analysis indicates that the highest exergy destruction occurs in the combustion chamber, owing to the large temperature differences and the highly irreversible exothermic chemical reactions.
https://jser.ut.ac.ir/article_83244_3863be0443f647737aaabd0bf7105073.pdf
2021-10-01
913
922
10.22059/jser.2021.326490.1210
Air-film cooling blade
Energy
Exergy
Gas Turbine
Wet compression
Hassan
Athari
h.athari@efc.ac.ir
1
Department of Mechanical Engineering, Elm-o-Fann University College of Science and Technology, Urmia, Iran
AUTHOR
Mostafa
Delpisheh
mdelpisheh@alumni.iust.ac.ir
2
School of Mechanical Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
AUTHOR
Maghsoud
Abdollahi Haghghi
st_m.abdollahihaghi@urmia.ac.ir
3
Department of Mechanical Engineering, Urmia University, Urmia, Iran
LEAD_AUTHOR
Yusef
Rahimi
yusef.rahimi2021@gmail.com
4
Department of Mechanical Engineering, Elm-o-Fann University College of Science and Technology, Urmia, Iran
AUTHOR
ORIGINAL_ARTICLE
AN Experimental Study of the Performance of a Solar Flat Plate Collector with Triangular Geometry
The flat plate collector is the most famous and simplest type of solar collectors that is used as a water heater. In this study, a solar flat plate collector with triangular geometry and with zigzag and non-riser tubes was experimentally examined. To assess the collector, the ASHRAE standard was used in hot and dry climate conditions. The test site was located in southwestern Iran and was tested in the early months from March to June 2020. The measured parameters include the environmental and thermal parameters of the collector and the fluid, and the best data have been selected and presented. The results of the study showed that the collector had a suitable efficiency; the lowest recorded value was 32% and the highest was 58.9 %. Hence, It could be used as a solar water heating system in both domestic and industrial sectors. In the pressure drop testing, the results showed that in all flow rates used, the pressure drop in the collector was less than 0.1 bar. Also, the performance of the collector was presented based on environmental variables such as temperature and radiation, as well as fluid variables such as input temperature and flow rate.
https://jser.ut.ac.ir/article_84310_9b68f7b0ad6491462205977eff47cd17.pdf
2021-10-01
923
936
10.22059/jser.2020.311364.1178
Flat plate
Triangular solar collector
Efficiency
Experimental
Mojtaba
Moravej
moravej60@pnu.ac.ir
1
Department of Mechanical Engineering, Payame Noor University, Iran.
LEAD_AUTHOR