scholarly journals Improving the Hybrid Photovoltaic/Thermal System Performance Using Water-Cooling Technique and Zn-H2O Nanofluid

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Hashim A. Hussein ◽  
Ali H. Numan ◽  
Ruaa A. Abdulrahman
Keyword(s):  
Flow Rate ◽  
Rear Surface ◽  
Weather Conditions ◽  
Energy Output ◽  
Thermal System ◽  
Water Cooling ◽  
Electrical Efficiency ◽  
Optimum Flow Rate ◽  
Photovoltaic Thermal System ◽  
Cooling Technique

This paper presented the improvement of the performance of the photovoltaic panels under Iraqi weather conditions. The biggest problem is the heat stored inside the PV cells during operation in summer season. A new design of an active cooling technique which consists of a small heat exchanger and water circulating pipes placed at the PV rear surface is implemented. Nanofluids (Zn-H2O) with five concentration ratios (0.1, 0.2, 0.3, 0.4, and 0.5%) are prepared and optimized. The experimental results showed that the increase in output power is achieved. It was found that, without any cooling, the measuring of the PV temperature was 76°C in 12 June 2016; therefore, the conversion efficiency does not exceed more than 5.5%. The photovoltaic/thermal system was operated under active water cooling technique. The temperature dropped from 76 to 70°C. This led to increase in the electrical efficiency of 6.5% at an optimum flow rate of 2 L/min, and the thermal efficiency was 60%. While using a nanofluid (Zn-H2O) optimum concentration ratio of 0.3% and a flow rate of 2 L/min, the temperature dropped more significantly to 58°C. This led to the increase in the electrical efficiency of 7.8%. The current innovative technique approved that the heat extracted from the PV cells contributed to the increase of the overall energy output.

scholarly journals Design of a Hybrid Photovoltaic Thermal System in Lebanon

2018 ◽  
Vol 171 ◽  
pp. 02002
Author(s):  
Elie Karam ◽  
Patrick Moukarzel ◽  
Maya Chamoun ◽  
Charbel Habchi ◽  
Charbel Bou-Mosleh
Keyword(s):  
Power Output ◽  
Electrical Power ◽  
Hot Water ◽  
Thermal System ◽  
Conduction Model ◽  
Electrical Efficiency ◽  
Pv Module ◽  
Temperature Loss ◽  
Photovoltaic Thermal System ◽  
Electrical Power Output

Due to global warming and the high toxic gas emissions of traditional power generation methods, renewable energy has become a very active topic in many applications. This study focuses on one versatile type of solar energy: Hybrid Photovoltaic Thermal System (hybrid PV/T). Hybrid PV/T combines both PV and thermal application and by doing this the efficiency of the system will increase by taking advantage of the temperature loss from PV module. The solar radiation and heat will be harnessed to deliver electricity and hot water simultaneously. In the present study a solar system is designed to recycle the heat and improve the temperature loss from PV module in order to supply both electricity and domestic hot water. The project was tested twice in Zouk Mosbeh - Lebanon; on May 18, 2016, and June 7, 2016. The average electrical efficiency was around 11.5% with an average electrical power output of 174.22 W, while with cooling, the average electrical efficiency reaches 11% with a power output of 200 W. The temperature increases by about 7 degrees Celsius from the inlet. The 1D conduction model is also performed in order to design the hybrid PV/T system.

scholarly journals Characteristics Study of Photovoltaic Thermal System with Emphasis on Energy Efficiency

2018 ◽  
Vol 152 ◽  
pp. 01003
Author(s):  
Chuah Yee Yong ◽  
Mohammad Taghi Hajibeigy ◽  
Chockalingam Aravind Vaithilingam ◽  
Rashmi Gangasa Walvekar
Keyword(s):  
Experimental Data ◽  
Energy Efficiency ◽  
Solar Energy ◽  
Thermal Energy ◽  
Heat Energy ◽  
Thermal System ◽  
Electrical Efficiency ◽  
Pv Panel ◽  
Photovoltaic Thermal System ◽  
Lower Temperature

Solar energy is typically collected through photovoltaic (PV) to generate electricity or through thermal collectors as heat energy, they are generally utilised separately. This project is done with the purpose of integrating the two systems to improve the energy efficiency. The idea of this photovoltaic-thermal (PVT) setup design is to simultaneously cool the PV panel so it can operate at a lower temperature thus higher electrical efficiency and also store the thermal energy. The experimental data shows that the PVT setup increased the electrical efficiency of the standard PV setup from 1.64% to 2.15%. The integration of the thermal collector also allowed 37.25% of solar energy to be stored as thermal energy. The standard PV setup harnessed only 1.64% of the solar energy, whereas the PVT setup achieved 39.4%. Different flowrates were tested to determine its effects on the PVT setup’s electrical and thermal efficiency. The various flowrate does not significantly impact the electrical efficiency since it did not significantly impact the cooling of the panel. The various flowrates resulted in fluctuating thermal efficiencies, the relation between the two is inconclusive in this project.

scholarly journals Experimental study on a high concentration photovoltaic/thermal system with plane mirrors array

2018 ◽  
Vol 22 (Suppl. 2) ◽  
pp. 517-525
Author(s):  
Haifei Chen ◽  
Jie Yang ◽  
Jie Ji ◽  
Wenzhu Huang ◽  
Gang Pei ◽  
...  
Keyword(s):  
Concentration Ratio ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Photovoltaic Module ◽  
Thermal System ◽  
Uniform Illumination ◽  
High Concentration ◽  
Electrical Efficiency ◽  
Photovoltaic Thermal System ◽  
The Cost

A high concentration photovoltaic/thermal system based on plane mirrors array has been developed and analyzed. It is found that the system with plane mirrors array not only can reduce the cost but also achieve a uniform illumination and adjustable concentration ratios. The system produces both electrical and thermal energy, with the electrical efficiency above 22% and the thermal efficiency above 47%. The experimental results show that the temperature coefficient of open circuit voltage in this photovoltaic module is around ?0.12 V/?C. Moreover, when the concentration ratio varies between 200 and 450, the decrease of electrical efficiency with the temperature is 0.08% per?C.

scholarly journals Experiment Investigation on Electrical and Thermal Performances of a Semitransparent Photovoltaic/Thermal System with Water Cooling

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Guiqiang Li ◽  
Gang Pei ◽  
Ming Yang ◽  
Jie Ji
Keyword(s):  
Thermal Efficiency ◽  
Electrical Power ◽  
Hot Water ◽  
Air Cooling ◽  
Thermal System ◽  
Water Cooling ◽  
Building Integrated Photovoltaic ◽  
Photovoltaic Thermal System ◽  
Set Up ◽  
T System

Different from the semitransparent building integrated photovoltaic/thermal (BIPV/T) system with air cooling, the semitransparent BIPV/T system with water cooling is rare, especially based on the silicon solar cells. In this paper, a semitransparent photovoltaic/thermal system (SPV/T) with water cooling was set up, which not only would provide the electrical power and hot water, but also could attain the natural illumination for the building. The PV efficiency, thermal efficiency, and exergy analysis were all adopted to illustrate the performance of SPV/T system. The results showed that the PV efficiency and the thermal efficiency were about 11.5% and 39.5%, respectively, on the typical sunny day. Furthermore, the PV and thermal efficiencies fit curves were made to demonstrate the SPV/T performance more comprehensively. The performance analysis indicated that the SPV/T system has a good application prospect for building.

scholarly journals Experimental Evaluation of a Flat Plate Solar Collector Under Hail City Climate

2018 ◽  
Vol 8 (2) ◽  
pp. 2750-2754
Author(s):  
N. Ben Khedher
Keyword(s):  
Flat Plate ◽  
Flow Rate ◽  
Solar Collector ◽  
Weather Conditions ◽  
Water Heater ◽  
Optimum Flow Rate ◽  
Water Heaters ◽  
Flat Plate Solar Collector ◽  
Flat Plate Collector ◽  
Solar Water Heaters

Flat plate solar water heaters are widely used for water heating in low-temperature residential applications. In this paper the thermal performance of a solar flat plate water heater under Hail weather conditions (latitude 27°52΄N longitude ‎41°69΄E) was experimentally investigated. Fluid was circulated through the imbedded copper tubes in the flat plate collector and inlet and outlet temperatures of the fluid were noted at five minute intervals. The experimental-time was between 9:00AM-15:00PM. A study was carried out experimentally to present the efficiency curves of a flat plate solar collector at different flow rates. ASHRAE standard 93-2003 was followed for calculation of instantaneous efficiency of solar collector. Result shows that the flow rate of the circulating fluid highly influence the thermal efficiency of the solar collector. Optimum flow rate of 2.5L/min leads to maximum collector efficiency.

scholarly journals Experimental and numerical investigation of a novel photovoltaic/thermal system using micro-channel flat loop heat pipe (PV/T-MCFLHP)

2020 ◽  
Vol 15 (4) ◽  
pp. 513-527 ◽  
Author(s):  
Fucheng Chen ◽  
Menglong Hu ◽  
Ali Badiei ◽  
Min Yu ◽  
Zicong Huang ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Heat Pipe ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Filling Ratio ◽  
Thermal System ◽  
Loop Heat Pipe ◽  
Micro Channel ◽  
Photovoltaic Thermal System ◽  
Simulated Solar Radiation

Abstract In this paper, a novel photovoltaic/thermal system using micro-channel flat loop heat pipe (PV/T-MCFLHP) is proposed, and the thermal and electrical performance of the system is investigated theoretically and experimentally. The variations of temperatures were analysed, and the efficiency of the system was calculated under different conditions, i.e. simulated solar radiation, water flow rate and refrigerant filling ratio. The maximum overall efficiency of the system was found to be 51.3%, the thermal efficiency 43.8% and the electrical efficiency 7.5% with the refrigerant filling ratio of 25%, simulated solar radiation of 800 W/m2 and water flow rate of 400 L/h. Test results were compared with simulation results, and the recorded average error was 10.2%.

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