Energy generation and storing electrical energy in an energy hybrid system consisting of solar thermal collector, Stirling engine and thermoelectric generator

The Cogeneration laboratory is a research facility in the University of Málaga (UMA) that allows for the behavioural study of a renewable energy installation combining solar resources and micro-CHP. Energy generation in the system is provided by a 3 kWp photovoltaic array, two solar thermal connectors and a Whispergen EU1 Stirling micro-CHP unit. Energy storage in the facility is provided by water tank and lithium-ion battery. This laboratory is managed through a programmable Mitsubishi PLC that permits the simulation of different thermal and electrical load profiles, as well as the mode of operation. The electrical energy management is controlled by the solar inverter. Environmental data, are measured using a top of the line weather station.The system’s real time status is logged through the programmable PLC. All this data is transferred and analysed in a purpose-built MATLAB-based software, where power and energy balances are conducted, efficiencies are calculated, and a CO2 emissions evaluation is studied.The CO2 emissions analysis is carried to evaluate the carbon dioxide emissions generated by the facility when the electrical and thermal demand are provided by the joint solar and micro-CHP system. These emissions come from the burning of natural gas in the micro-CHP Stirling engine, and the usage of electricity from the grid. With the current mode of operation, a reduction of up to 70% in CO2 emissions has been achieved, with an energy generation that exceeds the demand.

Download Full-text

An experimental study on energy generation with a photovoltaic (PV)–solar thermal hybrid system

Energy ◽

10.1016/j.energy.2008.03.005 ◽

2008 ◽

Vol 33 (8) ◽

pp. 1241-1245 ◽

Cited By ~ 81

Author(s):

Erzat Erdil ◽

Mustafa Ilkan ◽

Fuat Egelioglu

Keyword(s):

Experimental Study ◽

Hybrid System ◽

Energy Generation ◽

Solar Thermal

Download Full-text

Hybrid System Converting Solar Energy Into Electric Energy

Bulletin of Science and Practice ◽

10.33619/2414-2948/70/01 ◽

2021 ◽

Vol 7 (9) ◽

pp. 12-26

Author(s):

Yu. Ismanov ◽

N. Niyazov ◽

N. Dzhamankyzov

Keyword(s):

Mathematical Model ◽

Temperature Gradient ◽

Hybrid System ◽

Thermoelectric Generator ◽

Thermal Contact Resistance ◽

Thermal Contact ◽

Electrical Energy ◽

Operating Conditions ◽

Photovoltaic Module ◽

Optimal Operating

The article discusses a mathematical model of a hybrid system that combines photovoltaic and thermoelectric methods for converting concentrated solar energy into electrical energy. The specified mathematical model makes it possible to determine the temperatures of the photovoltaic module, as well as the temperature of the electrodes of the thermoelectric generator module. Optimal operating conditions have been determined for the hybrid system, taking into account the thermal contact resistance at the hot and cold sides of the thermoelectric generator. The simulation proceeded from the fact that only part of the absorbed solar radiation is converted into electricity due to the photoelectric effect, some part is lost due to radiation and convection from the upper surface of the photovoltaic module into the environment, and the rest is transferred to a thermoelectric generator connected to the lower part. photovoltaic module. A thermoelectric generator converts some of the thermal energy it receives from the photovoltaic module into electricity through the Seebeck effect, but most of it goes to the cooling system. The conversion of heat into electrical energy was based on the well-known Seebeck and Peltier effects. Along with these effects, such effects were taken into account as the formation of Joule heat due to the presence of electric current in the thermoelectric generator, Fourier thermal conductivity, as a consequence of the appearance of a temperature gradient in the transitions of a thermoelectric generator and Thomson heat, which arises both due to the presence of a temperature gradient, and electric current. The resulting model of the hybrid system makes it possible to study the effect of changing the temperature difference between the hot and cold electrodes of the thermoelectric generator and the resistance of the external circuit on the performance of the hybrid system. The model also allows the determination of the optimal operating conditions for the hybrid system, taking into account the thermal contact resistance on the hot and cold sides of the thermoelectric generator.

Download Full-text

Concentrated evacuated tubes for solar-thermal energy generation using stirling engine

2012 IEEE Energytech ◽

10.1109/energytech.2012.6304625 ◽

2012 ◽

Cited By ~ 2

Author(s):

Achintya Madduri ◽

Denise Loeder ◽

Nic Beutler ◽

Mike He ◽

Seth Sanders

Keyword(s):

Thermal Energy ◽

Energy Generation ◽

Stirling Engine ◽

Solar Thermal ◽

Solar Thermal Energy ◽

Evacuated Tubes

Download Full-text

Simulasi Sistem Hibrid Pembangkit Energi Surya, Angin, dan Generator Untuk Mengoptimalkan Pemanfaatan Daya Energi Terbarukan

CIRCUIT Jurnal Ilmiah Pendidikan Teknik Elektro ◽

10.22373/crc.v1i1.1381 ◽

2017 ◽

Vol 1 (1) ◽

Author(s):

Hendrayana Hendrayana

Keyword(s):

Renewable Energy ◽

Hybrid System ◽

Wind Turbines ◽

Alternative Energy ◽

Circuit Simulation ◽

Electrical Energy ◽

Energy Generation ◽

Solar Panels ◽

Power Deficit ◽

Renewable Energy Generation

Electrical energy crisis related to the increasing population in an area will increase the electrical energy customers. Besides diminishing reserves of fossil energy that is required of alternative energy from renewable energy sources. The problem is in incorporating a potential source of renewable energy with a generator needs power generation hybrid, the hybrid system with a generator as backup energy utilization is less than optimal because when there was a deficit power generator takes over all of the power wasted in renewable energy generation. The purpose of study is to produce a hybrid system design between the generation of solar energy, wind energy and generator as support (support) when the power deficit in energy of renewable generator. Research Method in the design of hybrid system is a design block diagram consisting of solar panels, wind turbines, inverters, and generator. At this stage it has produced research outputs in the form of models of hybrid renewable energy generation systems and generators, then make a circuit simulation and measurement. The results of this research is a hybrid system that works adaptive- connected the generator to the system when the power deficit or increase the load to provide power support on renewable energy generation. This hybrid system with a capacity of 3.5 kW less power than the previous system with the composition generator 5.7 kW 2.2 kW of renewable energy consists of a 1 kW solar panels, wind turbines 1.3 kW and 1.3 kW generator voltage at 310V DC bus coupling, the voltage on the bus coupling AC 220V / 50 Hz, total load current at 16A. The percentage utilization of renewable energy rose from 11.73% to 24,94% and generator utilization fell from 24.50% to 16.74%.

Download Full-text

Performance Analysis of Multi-Layer Thermoelectric Generators to be Used in a Thermoelectric Generator-Stirling Engine Hybrid System

Volume 6A: Energy ◽

10.1115/imece2015-53320 ◽

2015 ◽

Author(s):

Mohammed Waliur Rahman ◽

Khamid Mahkamov

Keyword(s):

Performance Analysis ◽

Low Temperature ◽

Hybrid System ◽

Temperature Difference ◽

Thermoelectric Generator ◽

Thermal Flux ◽

Stirling Engine ◽

Total Power ◽

Thermoelectric Generators ◽

Study Results

This paper demonstrates the performance analysis of various arrangements of thermoelectric generators to be used for the combination of a Low Temperature Difference Stirling Engine-Thermoelectric Generator hybrid system. To estimate whether the deployed Stirling Engines will perform on satisfactory level it is necessary to determine if a sufficient thermal flux can be provided to the heating part of the Low Temperature Difference Stirling Engine (LTD SE) from the “cold” side of the thermoelectric generator or their combination. This paper reports study results on the performance of a single layer and a cascaded two-layer thermoelectric generator made up of bulk material. These two generators were connected in series and in parallel to produce the combined thermoelectric module operating as a three-layer generator. Also computational data on the temperature distribution across the layers has been obtained using Finite Element Analysis as a part of ANSYS software. Results obtained demonstrate that both the single and two-layer generators provide sufficient heat flux to drive LTD SEs but the total power output from the two-layer generator-Stirling Engine system is considerable higher when the engine is coupled to a single and three-layered thermoelectric generator.

Download Full-text