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A novel concentrating photovoltaic/thermal solar system combined with thermoelectric module in an integrated design
, Article Renewable Energy ; Volume 113 , 2017 , Pages 822-834 ; 09601481 (ISSN) ; Shafii, M. B ; Jafari mosleh, H ; Sharif University of Technology
Elsevier Ltd
2017
Abstract
The use of solar energy concentration systems for achieving performance enhancements in the Photovoltaic/thermal hybrid solar systems and reduction of initial costs is an idea that has been studied for years. In this article a new structure for parabolic trough photovoltaic/thermal collector is proposed and its thermal and electrical performances are experimentally investigated. The receiver of this concentrator contains a triangular channel with an outer surface covered with photovoltaic cells and thermoelectric modules with a specific arrangement so that in addition to absorbing heat, a larger portion of the solar radiation is directly converted to electricity. Hence, the performance of...
Energy performance and economic feasibility of hot spring-based district heating system – A case study
, Article Energy ; Volume 211 , 2020 ; Hakkaki Fard, A ; Jafari Mosleh, H ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
As a versatile platform for integrating renewable energies, District Heating systems (DHSs) offer a pragmatic approach toward an environmentally benign and sustainable future. This paper puts forward the feasibility evaluation of using geothermal hot spring source Heat pumps (HPs) for district heating of a village situated in the north-west of Iran, with a cold mountain climate. Solar collectors are also integrated into the DHS as a supplementary heat source. To this aim, three different renewable-energy-based district heating scenarios, viz. a Ground-Source-HP-based (GSHP), a combined GSHP-flat-plate-solar-collector (GSHP-SFPC), and a combined GSHP-linear-parabolic-solar-collector...
Linear parabolic trough solar power plant assisted with latent thermal energy storage system: A dynamic simulation
, Article Applied Thermal Engineering ; Volume 161 , 2019 ; 13594311 (ISSN) ; Ahmadi, R ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
One of the efficient solar energy harvesting technics is the parabolic trough concentrated solar power plant. However, if the concentrated solar power plant were not equipped with a storage system, the power plant capacity factor would be deficient. Latent thermal energy storage system using phase change material (PCM) is a high energy density storage system to provide durable energy with a constant temperature. In this study, first, a dynamic analysis is performed implementing TRNSYS software on the parabolic trough concentrated solar power plant located in Shiraz, Iran. Consequently, this system is assisted by the latent thermal energy storage system to improve its performance and capacity...
Evaluation of a cooling system integrated with different phase change materials and its effect on peak load shaving
, Article International Journal of Energy Research ; Volume 45, Issue 7 , 2021 , Pages 10425-10449 ; 0363907X (ISSN) ; Kavian, S ; Jafari Mosleh, H ; Shafii, M. B ; Sharif University of Technology
John Wiley and Sons Ltd
2021
Abstract
In this study, a vapor-compression cooling system utilizing different phase change materials (PCMs) has been studied whereby the electricity consumption peak load is shifted. More specifically, the dynamic performance of cooling systems with and without using PCM is evaluated for the hottest day of the year. The proposed system uses the cooling energy to freeze, or “discharge” the PCM during nighttime when the cooling load is minimally needed and uses the stored thermal energy during the peak load hours by melting, or “charging” the PCM. This leads to better performance during peak load hours when higher cooling loads are needed. Different PCMs including oleic acid, SP224A, CL, CaCl2·6H2O...
Dynamic simulation of a trigeneration system using an absorption cooling system and building integrated photovoltaic thermal solar collectors
, Article Journal of Building Engineering ; Volume 43 , November , 2021 ; 23527102 (ISSN) ; Fayaz, R ; Delfani, S ; Jafari Mosleh, H ; Karami, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Solar systems are the most promising technologies to reduce building energy consumption. In recent years, one of the popular solar technologies is building integrated photovoltaic-thermal collectors, because of profitability and no need for separate architectural space. In this study, a new combination of glazed building integrated photovoltaic thermal solar collectors and an absorption cooling system, as a trigeneration system, to provide thermal and electrical energy demands of a case study residential building, is proposed. Dynamic simulation of the proposed system is performed using the TRNSYS-MATLAB co-simulator. Because there is no model for the glazed photovoltaic thermal solar...
A modified solar desalination system using evacuated tube collector
, Article Desalination ; Volume 396 , 2016 , Pages 30-38 ; 00119164 (ISSN) ; Jahangiri Mamouri, S ; Lotfi, M. M ; Jafari Mosleh, H ; Sharif University of Technology
Elsevier
2016
Abstract
Solar energy is turning to one of the important types of clean energies, due to its availability, and its potential for wide range of applications. In this work, a new passive solar desalination system is introduced, which benefits from excellences of twin-glass evacuated tube collectors. For the first time, the evacuated tube collector is not only used as the solar thermal collector, but also as a basin to heat the water. Hence, the thermal resistance between the collector and basin is virtually eliminated. Results show a considerable increase in the rate of desalinated water production and the maximum production reaches up to 0.83 kg/(m2·h). It was observed that the maximum rate of the...
A year-round dynamic simulation of a solar combined, ejector cooling, heating and power generation system
, Article Applied Thermal Engineering ; Volume 153 , 2019 , Pages 1-14 ; 13594311 (ISSN) ; Hakkaki Fard, A ; DaqiqShirazi, M ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
In this study, a year-round dynamic simulation of a Combined Cooling, Heating and Power generation (CCHP) system has been performed. The proposed system is composed of an ejector cooling system, an Organic Rankine Cycle (ORC), a solar collector field, heat exchangers and hot and cold storage tanks. It is considered that, a portion of the system input energy is provided by a solar collector field and an auxiliary heater supplies the extra required energy. The dynamic simulation of the introduced CCHP system is performed. The developed model is used to evaluate a year-round performance of the system for a residential building located in Tehran. The obtained results indicated that the proposed...
Design, Manufacture and Study of a Desalination System with Heat Pipe and PTC
, M.Sc. Thesis Sharif University of Technology ; Behshad Shafii, Mohammad (Supervisor)
Abstract
According to studies on solar stills, there has been designed an industrial solar still with a linear parabolic through collector (PTC) having higher efficiency than similar systems. Linear PTC coupled with heat pipe is very effective for increasing the efficiency of solar still. This system includes a parabolic trough collector functions by focusing the sunlight on a heat pipe and absorption of heat by a heat pipe. To minimize heat loss, heat pipe is embedded in an evacuated tube collector. By absorbing the heat, the working fluid of the heat pipe (ethanol) will be evaporated and due to its reduced density, it moves upwards and attains to the condenser. The external part of the condenser is...
An experimental investigation into the melting of phase change material using Fe3O4 magnetic nanoparticles under magnetic field
, Article Journal of Thermal Analysis and Calorimetry ; Volume 146, Issue 1 , 2021 , Pages 381-392 ; 13886150 (ISSN) ; Aghababaei, A ; Mohammadi, O ; Jafari Mosleh, H ; Shafii, M. B ; Ahmadi, M. H ; Sharif University of Technology
Springer Science and Business Media B.V
2021
Abstract
The low thermal conductivity of phase change materials has resulted in prolonged melting and freezing processes (charge and discharge) in these materials. This problem has limited the application of these materials in the field of thermal energy storage. In the present study, the effects of adding Fe3O4 magnetic nanoparticles at various concentrations as well as applying the magnetic field on the melting process of paraffin as phase change material have been experimentally studied. Thereupon, a cubic chamber in which the left wall applied a constant heat flux was used. At the optimum concentration of nanoparticles (1 mass%), the constant magnetic field with the intensities of 0.01 T and...
Experimental and numerical investigation of using pulsating heat pipes instead of fins in air-cooled heat exchangers
, Article Energy Conversion and Management ; Volume 181 , 2019 , Pages 653-662 ; 01968904 (ISSN) ; Bijarchi, M. A ; Shafii, M. B ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
The goal of this study is the experimental and numerical investigation of using pulsating heat pipes (PHPs) as substitutes for fins in a typical air-cooled heat exchanger. Due to the small temperature difference between the cooling air and internal airflow in the case study, it was necessary that appropriate PHPs with the capability to work in small temperature difference conditions be investigated and an appropriate working fluid be selected. After reviewing various studies, R134a was selected as the best working fluid from the heat transfer standpoint. Afterward, a testing device was designed and fabricated. Additionally, in order to predict the behaviors of the main tubes with pulsating...
A review on the applications of micro-/nano-encapsulated phase change material slurry in heat transfer and thermal storage systems
, Article Journal of Thermal Analysis and Calorimetry ; 2020 ; Mahmoudian, A ; Mohammadi, O ; Shafii, M. B ; Jafari Mosleh, H ; Zandieh, M ; Ahmadi, M. H ; Sharif University of Technology
Springer Netherlands
2020
Abstract
In modern heat transfer systems, thermal storage not only causes the balance between demand and supply, but also improves the heat transfer efficiency in these systems. In the present study, a comprehensive review of the applications of micro- or nano-encapsulated phase change slurries (MPCMs/NPCMs), as well as their effects on thermal storage and heat transfer enhancement, has been conducted. MPCMs/NPCMs have a myriad of applications and various usages such as pipe and channel flows, photovoltaic/thermal, solar heaters, air conditioning systems, storage tanks and heat pipes that have been categorized and studied. It was found that there are many advantageous adding MPCM/NPCM to the base...
A review on the applications of micro-/nano-encapsulated phase change material slurry in heat transfer and thermal storage systems
, Article Journal of Thermal Analysis and Calorimetry ; Volume 145, Issue 2 , 2021 , Pages 245-268 ; 13886150 (ISSN) ; Mahmoudian, A ; Mohammadi, O ; Shafii, M. B ; Jafari Mosleh, H ; Zandieh, M ; Ahmadi, M. H ; Sharif University of Technology
Springer Science and Business Media B.V
2021
Abstract
In modern heat transfer systems, thermal storage not only causes the balance between demand and supply, but also improves the heat transfer efficiency in these systems. In the present study, a comprehensive review of the applications of micro- or nano-encapsulated phase change slurries (MPCMs/NPCMs), as well as their effects on thermal storage and heat transfer enhancement, has been conducted. MPCMs/NPCMs have a myriad of applications and various usages such as pipe and channel flows, photovoltaic/thermal, solar heaters, air conditioning systems, storage tanks and heat pipes that have been categorized and studied. It was found that there are many advantageous adding MPCM/NPCM to the base...
A new desalination system using a combination of heat pipe, evacuated tube and parabolic through collector
, Article Energy Conversion and Management ; Volume 99 , July , 2015 , Pages 141-150 ; 01968904 (ISSN) ; Mamouri, S. J ; Shafii, M. B ; Hakim Sima, A ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
The solar collectors have been commonly used in desalination systems. Recent investigations show that the use of a linear parabolic through collector in solar stills can improve the efficiency of a desalination system. In this work, a combination of a heat pipe and a twin-glass evacuated tube collector is utilized with a parabolic through collector. Results show that the rate of production and efficiency can reach to 0.27 kg/(m2 h) and 22.1% when aluminum conducting foils are used in the space between the heat pipe and the twin-glass evacuated tube collector to transfer heat from the tube collector to the heat pipe. When oil is used as a medium for the transfer of heat, filling the space...
Dynamic simulation of a solar ejector-based trigeneration system using TRNSYS-EES co-simulator
, Article Energy Science and Engineering ; Volume 10, Issue 3 , 2022 , Pages 707-725 ; 20500505 (ISSN) ; Jafari Mosleh, H ; Karami, M ; Sharif University of Technology
John Wiley and Sons Ltd
2022
Abstract
In this paper, a new configuration of a solar combined cooling, heating, and power (CCHP) system is proposed to recover the waste thermal energy of a steam power plant, which provides the cooling and heating needs of an apartment complex located in Tehran. The required energy of the system is supplied by the parabolic trough solar collectors (PTCs) and, if necessary, an auxiliary heater is also used. An ejector refrigeration cycle (ERC) and a steam Rankine cycle are used for cooling and power generation, respectively. The cycle is dynamically modeled over a year using a TRNSYS-EES co-simulator. It is found that the highest Rankine cycle efficiency is obtained in the cold months (January)...
Experimental evaluation of a vapor compression cycle integrated with a phase change material storage tank based on two strategies
, Article Energy Reports ; Volume 10 , 2023 , Pages 850-863 ; 23524847 (ISSN) ; Jafari Mosleh, H ; Shafii, M. B ; Sharif University of Technology
Elsevier Ltd
2023
Abstract
In this survey, the integration of a vapor compression cycle with a phase change material (PCM) storage tank has been evaluated experimentally during the hottest days of five cities with different weather conditions: Tehran, Ramsar Hamedan, Bushehr, and Ahvaz. The temperature conditions for outdoor (condenser, compressor, etc.) and indoor (evaporator) air conditioning units are provided with the help of two separated test chambers and a controller system. The desired system has been examined based on two scenarios. In each scenario, the system is assessed for the conventional air conditioning (AC) system (with no PCM involved) and the AC plus PCM unit. Based on scenario 1 operating strategy,...
A comprehensive comparative investigation on solar heating and cooling technologies from a thermo-economic viewpoint—A dynamic simulation
, Article Energy Science and Engineering ; December , 2020 ; Behnam, P ; Abbasi Kamazani, M ; Mohammadi, O ; Kavian, S ; Ahmadi, P ; Rosen, M. A ; Sharif University of Technology
John Wiley and Sons Ltd
2020
Abstract
The yearly thermo-economic performance is dynamically investigated for three solar heating and cooling systems: solar heating and absorption cooling (SHAC), solar heating and ejector cooling (SHEC), and heating and solar vapor compression cooling (HSVC). First, the effects of important design parameters on the thermo-economic performance of the systems to supply the heating and cooling loads of the building are evaluated. The systems are parametrically analyzed with the weather conditions of Tehran, Iran. The results show that the life cycle costs (LCC) of the SHAC and HSVC systems are alike and much lower than those of the SHEC system. The HSVC system exhibits the best performance from...
A comprehensive comparative investigation on solar heating and cooling technologies from a thermo-economic viewpoint—A dynamic simulation
, Article Energy Science and Engineering ; Volume 9, Issue 5 , 2021 , Pages 724-742 ; 20500505 (ISSN) ; Behnam, P ; Abbasi Kamazani, M ; Mohammadi, O ; Kavian, S ; Ahmadi, P ; Rosen, M. A ; Sharif University of Technology
John Wiley and Sons Ltd
2021
Abstract
The yearly thermo-economic performance is dynamically investigated for three solar heating and cooling systems: solar heating and absorption cooling (SHAC), solar heating and ejector cooling (SHEC), and heating and solar vapor compression cooling (HSVC). First, the effects of important design parameters on the thermo-economic performance of the systems to supply the heating and cooling loads of the building are evaluated. The systems are parametrically analyzed with the weather conditions of Tehran, Iran. The results show that the life cycle costs (LCC) of the SHAC and HSVC systems are alike and much lower than those of the SHEC system. The HSVC system exhibits the best performance from...
Performance analysis and transient simulation of a vapor compression cooling system integrated with phase change material as thermal energy storage for electric peak load shaving
, Article Journal of Energy Storage ; Volume 35 , 2021 ; 2352152X (ISSN) ; Jafari Mosleh, H ; Kavian, S ; Shafii, M. B ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
A vapor-compression cooling system utilizing PCM is studied whereby the electricity consumption peak load is shifted. More specifically, the dynamic performance of the cooling system with and without PCM is evaluated and is presented with details on the hottest day of the year in Tehran, Iran. The proposed system uses the cooling energy to freeze or “discharge” the PCM during nighttime when the cooling load is minimally needed and uses the stored cooling energy during the peak load hours by melting or “charging” the PCM. This leads to better performance during the peak load hours when higher cooling loads are required. Oleic acid was chosen as PCM. The simulation was performed in EES...
Fibre position effects on the operation of opto-pair fibre displacement sensors
, Article Optics and Laser Technology ; Volume 43, Issue 4 , 2011 , Pages 814-819 ; 00303992 (ISSN) ; Golnabi, H ; Sharif University of Technology
2011
Abstract
In this article, two optical-fibre probes used in displacement measurements are reported. In one arrangement, two optical fibres with protective buffer jackets are placed together, while in the second arrangement, the protective buffer jackets are removed and the two fibres are placed with the claddings in contact, with a concomitant smaller centrecentre distance. As the core and cladding diameters are the same in both probes, the effect of the centrecentre distance on double-fibre designs can be investigated. The reflected output powers are recorded for the probes as a function of the axial distance from a reflective surface. A theoretical model is also implemented, which considers the...
Simulation of three different double-fiber probes for reflection sensing
, Article Journal of Applied Sciences ; Volume 10, Issue 1 , 2010 , Pages 20-28 ; 18125654 (ISSN) ; Golnabi, H ; Sharif University of Technology
2010
Abstract
In this study simulation results for three double-fiber optical designs for the reflection measurements are reported. Modeling is perused for three cases namely Equal Fibers (EF), transmitter fiber shorter (TS) and receiver fiber shorter (RS) designs. By proper modeling and written programs the operations of such symmetric double-fiber probes are simulated and the role of different crucial parameters such as fiber-to-fiber distance (t), fiber core radius (r) and fiber Numerical Aperture (NA) are investigated. In the second study simulation results for the transmitter fiber shorter and receiver fiber shorter designs are investigated for different fiber length differences (w). Finally...