scholarly journals Overview of the hybrid solar system

2020 ◽  
Vol 14 (1) ◽  
pp. 100-108
Author(s):  
Mohammed Alktranee ◽  
Péter Bencs
Keyword(s):  
Hybrid Systems ◽  
Thermal Energy ◽  
Rural Areas ◽  
Electric Energy ◽  
Operating Conditions ◽  
Solar Thermal ◽  
Geothermal System ◽  
Pv Panel ◽  
Separate System ◽  
Continuous Power

This paper investigates the uses of solar energy systems in various applications to define the most appropriate system that has highly efficient and reliable. Most of the urban even rural areas that suffer from lack of continuous power supplies it prefer to depend on hybrid systems like solar/wind systems, solar/geothermal system and solar/diesel-battery systems. Investigation indicates that hybrid systems could meet the required loads in different proportions depending on the operating conditions and components of the hybrid system compare with the separate system but has complexity regarding their components of the system with the high initial cost Moreover, Utilize hybrid solar/thermal system is more sufficient than had systems that mentioned as a result of the improvements at his parts to increase the overall efficiency by use PCM, nanofluid or a mix of PCM - nanofluid as cooling the PV panel to keep the efficiency of the solar cells and increase thermal energy. Thus, hybrid solar/thermal systems had proven effective to meet the required loads of electric energy and good capacity to provide thermal energy simultaneously without toxic emissions with a negligible complexity of its components.

Improvement of the Electric Energy Quality While Using a Super-Compensator

2013 ◽  
Vol 313-314 ◽  
pp. 858-864
Author(s):  
A. Rahmouni ◽  
B. Mazari ◽  
C. Benachaiba
Keyword(s):  
Control Method ◽  
Electric Energy ◽  
Electrical Energy ◽  
Active Filter ◽  
Operating Conditions ◽  
Load Current ◽  
Highly Efficient ◽  
Continuous Power

This paper is a contribution to improve the quality of the electrical energy, of which we study a new compensator that is a combination between a parallel active filter and an UPQC. The two FAP parts use a method of identification of the disruptive currents taking as a basis on calculates it of the reference currents from the components fundamental of the load current relative to the active and reactive continuous powers. that is based on the calculated reference currents from the fundamental components of the load current on the active and the reactive continuous power. That is metered to demonstrate the reliability and effectiveness of this compensator. We were compared it with the UPQC under the same operating conditions. The results of this work have shown that this new control method and highly efficient and super- compensator also gave satisfactory results compared to the UPQC in the case where the load is doubled.

scholarly journals Selection of low temperature thermal power cycles

2020 ◽  
pp. 165-165
Author(s):  
Mukundjee Pandey ◽  
Biranchi Padhi ◽  
Ipsita Mishra
Keyword(s):  
Low Temperature ◽  
Thermal Energy ◽  
High Efficiency ◽  
Thermal Power ◽  
Organic Rankine Cycle ◽  
Operating Conditions ◽  
Solar Thermal ◽  
Heat Extraction ◽  
Solar Thermal Energy ◽  
Kalina Cycle

In today?s world, we are facing the problem of fossil fuel depletion along with its cost continuously increasing. Also, it is getting difficult to live in a pollution free environment. Solar energy is one of the most abundantly and freely available form of energy. Out of the various ways to harness solar en-ergy, solar thermal energy is the most efficient as compared to photo-voltaic technology. There are various cycles to convert the solar thermal energy to mechanical work, but Kalina cycle (KC) is one of the best candidates for high efficiency considerations. Therefore, the authors have proposed a novel KC having the double separator arrangements to increase the amount of ammonia vapors at the inlet of turbine, and hence have tried to minimize the pumping power for Double Separator Kalina Cycle (DS-KC) by reducing the fraction of gas/vapors through it. Here, in this paper we have tried to com-pare Organic Rankine Cycle (ORC), Brayton Cycle (BC) and Double Sepa-rator Kalina Cycle (DS-KC) for low temperature heat extraction from para-bolic trough collectors having arc-circular plug with slits (PTC). The effect of different operating conditions; like the number of PTCs, mass flow rate of fluids in different cycles, pressure difference in turbine are analyzed. The ef-fect of these different operating conditions on different parameters like net work done, heat lost by condenser, thermal efficiency and installation cost per unit kW for DS-KC, ORC and BC are studied.

Off-Design of a Pumped Thermal Energy Storage Based on Closed Brayton Cycles

2021 ◽  
Author(s):  
Guido Francesco Frate ◽  
Luigia Paternostro ◽  
Lorenzo Ferrari ◽  
Umberto Desideri
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Electric Energy ◽  
Packed Bed ◽  
Operating Conditions ◽  
Part Load ◽  
Storage Technologies ◽  
Thermodynamical Behavior ◽  
The Impact

Abstract The growth of renewable energy source requires reliable, durable and cheap storage technologies. In this field, the Pumped Thermal Energy Storage (PTES), is drawing some interest as it appears not to be affected by geographical limitations and use very cheap materials. PTES is less efficient than pumped hydro and batteries, but it could achieve satisfactory efficiencies, show better economic performance and be characterized by negligible environmental impacts. A PTES stores the electric energy as thermal exergy in solid packed beds, by operating two closed Brayton cycles, one for charging and the other one for discharging. Although PTES thermodynamical behavior is well understood, the interaction between the components is rarely investigated. This study investigates the impact of packed-bed behavior on turbomachines operating conditions. In this way, PTES off-design and part-load performance are estimated. A control strategy especially suited for closed Brayton cycles, i.e. the inventory control, is used to control the system. As it resulted, PTES is characterized by an excellent part-load performance, which might be a significant advantage over the competing technologies. However, the off-design operation induced by the packed-bed thermal behavior might significantly reduce the system performance and, in particular, that of the discharge phase.

scholarly journals Multifunctional [(CH₃)₃S][FeCl4] Plastic Crystal for Solar Thermal and Electric Energy Storage

2020 ◽  
Author(s):  
Jorge Salgado-Beceiro ◽  
Juan Manuel Bermudez Garcia ◽  
Antonio Llamas-Saiz ◽  
Socorro Castro-Garcia ◽  
Maria Antonia Señaris-Rodriguez ◽  
...  
Keyword(s):  
Phase Transition ◽  
Energy Storage ◽  
Thermal Energy ◽  
Electric Energy ◽  
Magnetic Behaviour ◽  
Solar Thermal ◽  
Plastic Crystal ◽  
Solar Thermal Energy ◽  
Electric Energy Storage ◽  
Multifunctional Properties

In this work, we report a new halometallate [(CH3)3S][FeCl4] with plastic crystal behaviour as a new material for multi-energy storage. This material undergoes a first-order solid-solid plastic crystal phase transition near room temperature with a relatively large latent heat (~40 kJ kg-1) and an operational temperature for storing and releasing thermal energy between 42 oC (315 K) and 29 oC (302 K), very appropriate for solar thermal energy storage. In addition, the dielectric, magnetization and electron spin resonance studies reveal that this material exhibits multifunctional properties with temperature-induced reversible changes in its dielectric, conducting and magnetic behaviour associated with the phase transition. Also, the dielectric permitivity increases sharply up to 5 times when inducing the phase transition, which can be exploited to store electric energy into a capacitor. Therefore, [(CH3)3S][FeCl4] is a very interesting compound with coexistence of multifunctional properties that can be useful for both solar thermal and electric energy storage.

scholarly journals Cacao roasting in rural areas of Peru using concentrated solar thermal energy: experimental results

2016 ◽  
Vol 1 ◽  
pp. 8
Author(s):  
François Veynandt ◽  
Juan Pablo Perez Panduro ◽  
Jorge Elías Soria Navarro ◽  
Miguel Hadzich
Keyword(s):  
Thermal Energy ◽  
Rural Areas ◽  
Experimental Results ◽  
Solar Thermal ◽  
Solar Thermal Energy

Off-Design of a Pumped Thermal Energy Storage Based On Closed Brayton Cycles

2021 ◽  
Author(s):  
Guido Francesco Frate ◽  
Luigia Paternostro ◽  
Lorenzo Ferrari ◽  
Umberto Desideri
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Electric Energy ◽  
Packed Bed ◽  
Operating Conditions ◽  
Part Load ◽  
Storage Technologies ◽  
Thermodynamical Behavior ◽  
The Impact

Abstract The growth of renewable energy source requires reliable, durable and cheap storage technologies. In this field, the Pumped Thermal Energy Storage (PTES), is drawing some interest as it appears not to be affected by geographical limitations and use very cheap materials. PTES is less efficient than pumped hydro and batteries, but it could achieve satisfactory efficiencies, show better economic performance and be characterized by negligible environmental impacts. A PTES stores the electric energy as thermal exergy in solid packed beds, by operating two closed Brayton cycles, one for charging and the other one for discharging. Although PTES thermodynamical behavior is well understood, the interaction between the components is rarely investigated. This study investigates the impact of packed-bed behavior on turbomachines operating conditions. In this way, PTES off-design and part-load performance are estimated. A control strategy especially suited for closed Brayton cycles, i.e. the inventory control, is used to control the system. As it resulted, PTES is characterized by an excellent part-load performance, which might be a significant advantage over the competing technologies. However, the off-design operation induced by the packed-bed thermal behavior might significantly reduce the system performance and, in particular, that of the discharge phase.

scholarly journals Multifunctional [(CH₃)₃S][FeCl4] Plastic Crystal for Solar Thermal and Electric Energy Storage

2020 ◽  
Author(s):  
Jorge Salgado-Beceiro ◽  
Juan Manuel Bermudez Garcia ◽  
Antonio Llamas-Saiz ◽  
Socorro Castro-Garcia ◽  
Maria Antonia Señaris-Rodriguez ◽  
...  
Keyword(s):  
Phase Transition ◽  
Energy Storage ◽  
Thermal Energy ◽  
Electric Energy ◽  
Magnetic Behaviour ◽  
Solar Thermal ◽  
Plastic Crystal ◽  
Solar Thermal Energy ◽  
Electric Energy Storage ◽  
Multifunctional Properties

In this work, we report a new halometallate [(CH3)3S][FeCl4] with plastic crystal behaviour as a new material for multi-energy storage. This material undergoes a first-order solid-solid plastic crystal phase transition near room temperature with a relatively large latent heat (~40 kJ kg-1) and an operational temperature for storing and releasing thermal energy between 42 oC (315 K) and 29 oC (302 K), very appropriate for solar thermal energy storage. In addition, the dielectric, magnetization and electron spin resonance studies reveal that this material exhibits multifunctional properties with temperature-induced reversible changes in its dielectric, conducting and magnetic behaviour associated with the phase transition. Also, the dielectric permitivity increases sharply up to 5 times when inducing the phase transition, which can be exploited to store electric energy into a capacitor. Therefore, [(CH3)3S][FeCl4] is a very interesting compound with coexistence of multifunctional properties that can be useful for both solar thermal and electric energy storage.

scholarly journals Thermodynamic Optimization of Electrical and Thermal Energy Production of PV Panels and Potential for Valorization of the PV Low-Grade Thermal Energy into Cold

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 498
Author(s):  
Anis Idir ◽  
Maxime Perier-Muzet ◽  
David Aymé-Perrot ◽  
Driss Stitou
Keyword(s):  
Thermal Energy ◽  
Operating Conditions ◽  
Gas Absorption ◽  
Coefficient Of Performance ◽  
Low Grade ◽  
Back Side ◽  
Pv Panel ◽  
Recovery Potential ◽  
Potential Improvement ◽  
Refrigeration Machine

In the present study, the evaluation of potential improvement of the overall efficiency of a common PV panel, valorizing the heat extracted by a heat exchanger that is integrated on its back side, either into work using an endoreversible Carnot engine or into cold by using an endoreversible tri-thermal machine consisting of a heat-driven refrigeration machine operating between three temperature sources and sink (such as a liquid/gas absorption machine), was carried out. A simplified thermodynamic analysis of the PV/thermal collector shows that there are two optimal operating temperatures and of the panels, which maximize either the thermal exergy or the overall exergy of the PV panel, respectively. The cold produced by the endoreversible tri-thermal machine during the operating conditions of the PV/thermal collector at is higher with a coefficient of performance (COP) of 0.24 thanks to the higher heat recovery potential. In the case of using the cold produced by a tri-thermal machine to actively cool of an additional PV panel in order to increase its electrical performances, the operating conditions at the optimal temperature provide a larger and more stable gain: the gain is about 12.2% compared with the conventional PV panel when the operating temperature of the second cooled panel varies from 15 to 35 °C.

Pyrazolium Phase Change Materials for Solar-Thermal and Wind Energy Storage

2019 ◽  
Author(s):  
Karolina Matuszek ◽  
R. Vijayaraghavan ◽  
Craig Forsyth ◽  
Surianarayanan Mahadevan ◽  
Mega Kar ◽  
...  
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
High Efficiency ◽  
Scale Up ◽  
Solar Thermal ◽  
Energy Storage Materials ◽  
Solar Thermal Energy ◽  
Storage Materials

Renewable energy has the ultimate capacity to resolve the environmental and scarcity challenges of the world’s energy supplies. However, both the utility of these sources and the economics of their implementation are strongly limited by their intermittent nature; inexpensive means of energy storage therefore needs to be part of the design. Distributed thermal energy storage is surprisingly underdeveloped in this context, in part due to the lack of advanced storage materials. Here, we describe a novel family of thermal energy storage materials based on pyrazolium cation, that operate in the 100-220°C temperature range, offering safe, inexpensive capacity, opening new pathways for high efficiency collection and storage of both solar-thermal energy, as well as excess wind power. We probe the molecular origins of the high thermal energy storage capacity of these ionic materials and demonstrate extended cycling that provides a basis for further scale up and development.

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