scholarly journals Investigation of Solar Hybrid Electric/Thermal System with Radiation Concentrator and Thermoelectric Generator

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Edgar Arturo Chávez Urbiola ◽  
Yuri Vorobiev
Keyword(s):  
Solar Radiation ◽  
Cooling System ◽  
Electrical Energy ◽  
Thermal System ◽  
Thermoelectric Generators ◽  
Cold Side ◽  
Thermal Systems ◽  
Running Water ◽  
Concentrated Solar Radiation ◽  
Radiation Sensors

An experimental study of a solar-concentrating system based on thermoelectric generators (TEGs) was performed. The system included an electrical generating unit with 6 serially connected TEGs using a traditional semiconductor material, Bi2Te3, which was illuminated by concentrated solar radiation on one side and cooled by running water on the other side. A sun-tracking concentrator with a mosaic set of mirrors was used; its orientation towards the sun was achieved with two pairs of radiation sensors, a differential amplifier, and two servomotors. The hot side of the TEGs at midday has a temperature of around 200°C, and the cold side is approximately 50°C. The thermosiphon cooling system was designed to absorb the heat passing through the TEGs and provide optimal working conditions. The system generates 20 W of electrical energy and 200 W of thermal energy stored in water with a temperature of around 50°C. The hybrid system studied can be considered as an alternative to photovoltaic/thermal systems, especially in countries with abundant solar radiation, such as Mexico, China, and India.

scholarly journals Fabrication and performance analysis of concentrated hybrid photovoltaic system

2018 ◽  
Vol 144 ◽  
pp. 04023
Author(s):  
Krishna Murthy ◽  
Ajay Daniel ◽  
Lanvin Concessao ◽  
Habbie Alex Roy ◽  
A. Ganesha
Keyword(s):  
Solar Radiation ◽  
Waste Heat ◽  
Cooling System ◽  
Photovoltaic System ◽  
Photovoltaic Module ◽  
Performance Study ◽  
Drastic Increase ◽  
Concentrated Solar Radiation ◽  
And Performance ◽  
Set Up

Sun is the most important source of renewable source of energy. During the past few decades there has been an ever-increasing interest in Photovoltaic (PV) cells as it directly converts solar radiation into electricity. This paper involves the performance study of photovoltaic system under concentrated solar radiation. The main problem with the concentration solar energy is the drastic increase in temperature of the photovoltaic module resulting in a decrease in performance efficiency of the system. This problem of overheating of the system can be overcome by providing cooling which would ensure operation of the module in the optimal temperature range. Hence, the setup would function as a hybrid model serving the dual purpose of power generation while also utilizing the waste heat for water heating applications. The experimental set up consist of a novel arrangement of concentrator and reflector and the cooling system. The Hybrid Photovoltaic System was repeatedly tested under real time conditions on several days. A comparison was drawn between the results obtained from direct exposure of a standard photovoltaic module to that obtained from the hybrid system in order to better understand the improvement in performance parameters. The study shown a significant improvement of output of standard photovoltaic module under the concentrated solar radiation.

A Refrigerator without Compressor Powered by Solar Energy

2016 ◽  
Vol 8 (01) ◽  
pp. 06-10
Author(s):  
Ashutosh Rai ◽  
Pankaj Kumar Yadav ◽  
Awdhesh Gupta
Keyword(s):  
Solar Energy ◽  
Heat Sink ◽  
Cooling System ◽  
Electrical Energy ◽  
Aluminum Plate ◽  
Thermoelectric Device ◽  
Thermoelectric Devices ◽  
Cold Side ◽  
Peltier Module ◽  
Very High

Thermoelectric refrigerator with an inner volume of 10 litre (approx.) has been designed and tested, whose cold system is composed of a Peltier and a fan (i.e. heat sink).Analysis of a its performance in different conditions has been carried out with this prototype. Thermoelectric devices are capable of converting electrical energy into thermal heat pumping at a very high efficiency.The cooling system is made up of one thermoelectric device, composed of a Peltier module (40 watt) with its hot side in contact with a heat sink and aluminum plate in contact with the cold side.

scholarly journals Kinerja Lemari Pendingin Alami yang digunakan Sesuai Kondisi Cuaca di Kota Medan

2018 ◽  
Vol 19 (2) ◽  
Author(s):  
Tulus Buhanuddin Sitorus ◽  
Farida Arianil ◽  
Tekad Sitepu
Keyword(s):  
Solar Radiation ◽  
Cooling System ◽  
Weather Conditions ◽  
Electrical Energy ◽  
Maximum Efficiency ◽  
Temperature Changes ◽  
Direct Evaporative Cooling ◽  
Evaporative Cooling System ◽  
Teak Wood ◽  
Vegetables And Fruits

One application in a direct evaporative cooling system was a natural cooler. The advantages of this system were not using the electrical energy and so far also environmentally. This research aims to obtain a performance analysis of the natural cooler as a store for vegetables and fruits in Medan city. The materials for natural cooler consists of teak wood and gunny. The experiments were conducted during seven days in the open air, which were exposed to the solar radiation. The parameter measurement on the weather was using HOBO devices and to record the temperature changes for vegetables or even fruits is using its acquisition data. The results showed that the maximum efficiency of the natural cooler could be obtained  for 43.79%  in the average air temperature of 30.51oC, the air humidity average is 85.12%  with  average solar radiation of 183.98 W/m2.  Experimental data were showing that the condition of  freshness on vegetables or even on  fruits was heavily influenced by weather conditions

Energieautarke Kühlung von Lineardirektantrieben*/Experimental investigation of self-sufficient cooling systems for linear direct drives of machine tools - Recuperation of the thermal losses in linear motors with thermoelectric generators

2017 ◽  
Vol 107 (05) ◽  
pp. 359-365
Author(s):  
E. Prof. Uhlmann ◽  
S. Salein
Keyword(s):  
Energy Harvesting ◽  
Machine Tools ◽  
Cooling System ◽  
Electric Energy ◽  
Electrical Energy ◽  
Efficient Solutions ◽  
Air Cooling ◽  
Thermoelectric Generators ◽  
Cooling Systems ◽  
Linear Motors

Das wachsende Bewusstsein für eine umweltgerechte und damit nachhaltige Fertigung sowie steigende Energiepreise führen zur erhöhten Nachfrage nach energieeffizienten Lösungsansätzen für langlebige Produktionsmittel. Die Energierückgewinnung von thermischen Verlusten durch thermoelektrische Generatoren stellt hierfür einen innovativen Ansatz dar. Das als Energy Harvesting bekannte Konzept wird am Institut für Werkzeugmaschinen und Fabrikbetrieb (IWF) der Technischen Universität Berlin auf seine Eignung zur Erhöhung der Energieeffizienz von hochdynamischen Werkzeugmaschinen untersucht. Der Fachbeitrag präsentiert experimentelle Ergebnisse zur Rückgewinnung von thermischen Verlusten eines Linearmotors. Die im Wärmefluss platzierten thermoelektrischen Generatoren generieren eine elektrische Leistung, die direkt zur Versorgung des Motorkühlsystems genutzt wird. Die Ergebnisse zeigen, dass die elektrischen Verbraucher eines Wasser- und Luftkühlsystems aus der rückgewonnenen Energie der thermoelektrischen Module betrieben werden können.   The growing awareness for environmentally friendly and sustainable production as well as the increase of energy costs leads to a rising demand for energy efficient solutions for long-life production facilities. An innovative approach in this field is the recuperation of energy from thermal loss through thermoelectric generators. The proof of applicability to use an energy harvesting concept in order to increase the energy efficiency of highly dynamic machine tools with linear direct drives is part of a research objective at the Institute for Machine Tools and Factory Management (IWF) of the Technische Universität Berlin. The present paper investigates experimentally the recuperation of thermal losses in linear direct drives. Thermoelectric generators are placed in the heat flow to convert heat into electric energy which is directly supplied to the cooling system of a device. Experimental results show the feasibility to operate the electrical loads of water and air cooling systems by the electrical energy harvested from thermoelectric generators.

scholarly journals Performance Comparison Between Hot Mirror and Cold Mirror as a Beam Splitter on Photovoltaic - Thermoelectric Generator Hybrid Using LabVIEW Simulator

2021 ◽  
Vol 39 (5) ◽  
pp. 1609-1617
Author(s):  
Zuryati Djafar ◽  
Andi Zahirah Salsabila ◽  
Wahyu H. Piarah
Keyword(s):  
Solar Radiation ◽  
Thermoelectric Generator ◽  
Beam Splitter ◽  
Radiation Spectrum ◽  
Electrical Energy ◽  
Fresnel Lens ◽  
Performance Comparison ◽  
Spectral Irradiance ◽  
Thermoelectric Generators ◽  
Labview Program

Solar energy can be converted into electrical energy using photovoltaic (PV) and thermoelectric generators (TEG). In order to increase the effectiveness of energy absorption, a hot mirror or cold mirror spectrum separator is used. In this study, a simulation was carried out to see the effect of the cold mirror and hot mirror spectrum separator on the performance of the PV-TEG hybrid. Simulations are carried out using the LabVIEW program. The standard for the solar radiation spectrum used is AM1.5D. The incoming radiation is transmitted using a Fresnel lens to make it more focused and then transmitted to a cold mirror or hot mirror, where the spectral irradiance will be halved. Spectral irradiance with a wavelength of 400-690 nm will be directed to PV and a wavelength of 710-1150 nm will be directed to TEG. From the PV-TEG hybrid modeling and simulation using the LabVIEW program, the resulting power and efficiency are 240.635 W/m2 and 27% respectively for cold mirror and 228.835 W/m2 and 25.76% for hot mirror.

scholarly journals Gas Flow in Hot Porous Materials: The Solar Air Receiver and Spin-Off Applications

2006 ◽  
Author(s):  
Thomas Fend ◽  
Bernhard Hoffschmidt ◽  
Oliver Reutter ◽  
Jo¨rg Sauerhering ◽  
Robert Pitz-Paal
Keyword(s):  
Solar Radiation ◽  
Porous Materials ◽  
Gas Flow ◽  
Flow Instability ◽  
Cooling System ◽  
Cross Flow ◽  
Ceramic Materials ◽  
Turbine Cooling ◽  
Concentrated Solar Radiation ◽  
Micrometer Scale

This article presents an overview on research results from various projects, which deal with one common problem: gas flow in hot porous materials. First, the solar air receiver, which converts concentrated solar radiation into heat in an air circuit, is described as far as the basic principle and the materials employed are concerned. Then, results from experiments in concentrated solar radiation are presented. Materials employed in these applications are extruded ceramic materials as well as metal and ceramic foams with pore sizes on the milli- and micrometer scale. As it turned out, the material properties significantly influence the efficiency of the solar air receiver. It is shown, that under specific conditions flow instability occurs, which may lead to a thermal overload of the material. Measures to avoid these overloads are proposed. Two approaches how to predict gas flow theoretically are reported. Additionally, it is shown, how material quantities such as pressure drop characteristics influence the flow behaviour and the temperature distribution inside the material. Finally, before a conclusion is given, two further applications, which have been dealt with because similar phenomena occur, are reported: an advanced cross flow particle filter and a gas turbine cooling system.

scholarly journals Water-Cooled Thermoelectric Generators for Improved Net Output Power: A Review

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8329
Author(s):  
Björn Pfeiffelmann ◽  
Ali Cemal Benim ◽  
Franz Joos
Keyword(s):  
Output Power ◽  
Waste Heat ◽  
Cooling System ◽  
Electrical Energy ◽  
Air Cooling ◽  
Thermoelectric Generators ◽  
Water Cooling ◽  
Active Cooling ◽  
Microchannel Cooling ◽  
Low Efficiency

Thermoelectric generators (TEGs) have the ability to convert waste heat into electrical energy under unfavorable conditions and are becoming increasingly popular in academia, but have not yet achieved a broad commercial success, due to the still comparably low efficiency. To increase the efficiency and economic viability of TEGs, research is performed on the materials on one hand and on the system connection on the other. In the latter case, the net output power of the cooling system plays a key role. At first glance, passive cooling seems preferable to active cooling because it does not affect the net electrical output power. However, as shown in the present review, the active cooling is to be preferred for net output power. The situation is similar in air and water-cooling. Even though air-cooling is easier to set up, the water-cooling should be preferred to achieve higher net output power. It is shown that microchannel cooling has similar hydraulic performance to conventional cooling and inserts increase the net output power of TEG. As the review reveals that active water-cooling should be the method of choice to achieve high net output power, it also shows that a careful optimization is necessary to exploit the potential.

Performansi aktual modul photovoltaik dengan pengarah matahari

2018 ◽  
Vol 12 (2) ◽  
pp. 98 ◽  
Author(s):  
Jalaluddin . ◽  
Baharuddin Mire
Keyword(s):  
Solar Radiation ◽  
Local Time ◽  
Performance Characteristic ◽  
Electrical Energy ◽  
Photovoltaic Module ◽  
Experiment Data ◽  
Actual Performance ◽  
Pv Module ◽  
Solar Tracking ◽  
Pv Modules

Actual performance of photovoltaic module with solar tracking is presented. Solar radiation can be converted into electrical energy using photovoltaic (PV) modules. Performance of polycristalline silicon PV modules with and without solar tracking are investigated experimentally. The PV module with dimension 698 x 518 x 25 mm has maximum power and voltage is 45 Watt and 18 Volt respectively. Based on the experiment data, it is concluded that the performance of PV module with solar tracking increases in the morning and afternoon compared with that of fixed PV module. It increases about 18 % in the morning from 10:00 to 12:00 and in the afternoon from 13:30 to 14:00 (local time). This study also shows the daily performance characteristic of the two PV modules. Using PV module with solar tracking provides a better performance than fixed PV module. 

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