Exergy analysis of solar radiation processes

2013 ◽  
pp. 25-114
Keyword(s):  
Solar Radiation ◽  
Exergy Analysis ◽  
Radiation Processes

scholarly journals Energy and exergy analysis of air based photovoltaic thermal (PVT) collector: a review

2019 ◽  
Vol 9 (1) ◽  
pp. 109 ◽  
Author(s):  
Ahmad Fudholi ◽  
Mariyam Fazleena Musthafa ◽  
Abrar Ridwan ◽  
Rado Yendra ◽  
Ari Pani Desvina ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Flat Plate ◽  
Solar Collector ◽  
Exergy Analysis ◽  
Exergy Efficiency ◽  
Pv Panel ◽  
Energy And Exergy ◽  
Energy And Exergy Analysis ◽  
Flat Plate Solar Collector

<span lang="EN-US">Photovoltaic thermal (PVT) collectors convert solar radiation directly to both electrical and thermal energies. A PVT collector basiccaly combines the functions of a flat plate solar collector and those of a PV panel. This review presents thermodinamics fundamentals, descriptions, and previous works conducted on energy and exergy analysis of air based PVT collector. Studies in 2010 to 2018 of the energy and exergy analysis of air based PVT collectors are summarized. The energy and exergy efficiency of air based PVT collector ranges from 31% to 94% and 8.7% to 18%, respectively. In addition, flat plate solar collector is presented. Studies conducted on air based PVT collectors are reviewed.</span>

Thermodynamic Performance of a Photovoltaic System

2008 ◽  
Author(s):  
Anand S. Joshi ◽  
Ibrahim Dincer ◽  
Bale V. Reddy
Keyword(s):  
Solar Radiation ◽  
Fill Factor ◽  
Exergy Analysis ◽  
Power Conversion ◽  
Thermodynamic Characteristics ◽  
Photovoltaic System ◽  
Pv System ◽  
Pv Panel ◽  
Thermodynamic Performance ◽  
Current Area

In this paper, an attempt is made to investigate the thermodynamic characteristics of a photovoltaic (PV) system based on exergy. A new efficiency is developed that is useful in studying the PV performance and possible improvements. Exergy analysis is applied to a PV system and its components, in order to evaluate the effect of various parameters e.g., voltage, current, area of the PV panel, fill factor and ambient temperature on exergy efficiency. Effect of solar radiation on power conversion efficiency is also evaluated.

Exergetic Efficiencies and the Exergy Content of Terrestrial Solar Radiation

2004 ◽  
Vol 126 (1) ◽  
pp. 673-676 ◽  
Author(s):  
Sean E. Wright ◽  
Marc A. Rosen
Keyword(s):  
Solar Radiation ◽  
Exergy Analysis ◽  
Second Law Of Thermodynamics ◽  
Second Law ◽  
Radiative Fluxes ◽  
Solar Engineering ◽  
Practical Performance ◽  
Maximum Work ◽  
Energy Conversion Devices ◽  
Better Than

In the field of solar engineering the practical performance of solar energy conversion devices is generally evaluated strictly on an energy (first law) basis. However, the second law of thermodynamics determines the maximum work potential or exergy content of radiative fluxes independent of any conceptual device. The work in this paper quantifies the effect of directional and spectral distribution of terrestrial solar radiation (SR) on its exergy content. This is particularly important as the thermodynamic character of terrestrial SR is very different from that of blackbody radiation (BR). Exergetic (second law) efficiencies compare the work output of a device to the exergy content of the radiative source flux rather than its energy flux. As a result, exergetic efficiencies reveal that the performance of devices in practice is always better than what is indicated by the corresponding energy efficiency. The results presented in this paper introduce the benefits of using exergy analysis for solar cell design, performance evaluation and optimization.

scholarly journals Experimental and model validation of photovoltaic-thermal (PVT) air collector: exergy analysis

2021 ◽  
Vol 12 (1) ◽  
pp. 10-17
Author(s):  
Ahmad Fudholi ◽  
Mariyam Fazleena Musthafa ◽  
Goh Li Jin ◽  
Rudi Darussalam ◽  
Ahmad Rajani ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Mass Flow ◽  
Exergy Analysis ◽  
Experimental Studies ◽  
Energy Balance Equation ◽  
Experimental Results ◽  
Inversion Method ◽  
Outlet Temperature ◽  
Pv Module

Solar energy is a renewable energy that can produce heat via a thermal system and generate electricity via a photovoltaic (PV) module. A photovoltaic-thermal (PVT) collector is a system that has a PV module combined with a thermal collector system. The PVT collector is a popular technology for harvesting solar energy. A PVT collector can generate both electrical and thermal energies simultaneously. The study aims to validate the PV and outlet temperature for various mass flow rates and solar radiation. To develop a predictive model, a steady-state energy analysis of a PVT air collector was performed. An energy balance equation was solved using the matrix inversion method. The theoretical model was developed and validated against the experimental results, which have a similar trend and are consistent with the experimental results. On the other hand, the validated model was used to study the performances of PVT air collectors using exergy analysis for the mass flow rate ranging from 0.007 kg/s to 0.07 kg/s and solar radiation ranging from 385 W/m2 to 820 W/m2. The result from the mathematical model was found to be consistent with the experimental data with an accuracy of about 95 %. The average PVT exergy efficiency was found to be 12.7 % and 12.0 % for the theoretical and experimental studies, respectively.

Optimization of Operating Parameters of a Solar Ejector Refrigeration System on Exergy Analysis

2012 ◽  
Vol 178-181 ◽  
pp. 37-41
Author(s):  
Li Yuan Yin ◽  
Qi Tian ◽  
Fei Fei Zhang
Keyword(s):  
Solar Radiation ◽  
Exergy Analysis ◽  
Exergy Efficiency ◽  
Operating Conditions ◽  
Operating Parameters ◽  
Condensation Temperature ◽  
Refrigeration Cycle ◽  
Refrigeration System ◽  
Irreversible Loss ◽  
Evaporation Temperature

Exergy analysis is used as a tool to analyze the performance of a refrigeration system. In this paper, it is based on the following conditions: the solar radiation is set as 750 W/m2, the refrigerating capacity is 10 kW, R141b is fixed as the refrigerant in the refrigeration cycle and ambient temperature to be the reference temperature is 31°C. The exergy analysis results of the solar ejector refrigeration system shows that irreversible loss comes from all components and depends on the operating temperatures. The exergy efficiency increases with the condensation temperature’s decrease or the evaporation temperature’s increase. In the specific evaporation temperature and condensation temperature, the optimum generating temperature can be get when the system exergy efficiency is at its maximum. For the operating conditions in this paper, the optimum generating temperature is 95°C.

Assessing the WRF-Solar model performance using satellite-derived irradiance from the National Solar Radiation Database

2021 ◽  
Author(s):  
Jaemo Yang ◽  
Ju-Hye Kim ◽  
Manajit Sengupta ◽  
Jimy Dudhia
Keyword(s):  
Solar Radiation ◽  
Weather Prediction ◽  
Model Performance ◽  
Absolute Error ◽  
Forecast Errors ◽  
Grid Spacing ◽  
Radiative Effects ◽  
High Quality ◽  
Radiation Processes ◽  
Nwp Model

Abstract WRF-Solar is a numerical weather prediction (NWP) model specifically designed to meet the increasing demand for accurate solar irradiance forecasting. The model provides flexibility in the representation of the aerosol-cloud-radiation processes. This flexibility can be argued to make more difficult to improve the model’s performance due to the necessity of inspecting different configurations. To alleviate this, WRF-Solar has a reference configuration to use it as a benchmark in sensitivity experiments. However, the scarcity of high-quality ground observations is a handicap to accurately quantify the model performance. An alternative to ground observations are satellite irradiance retrievals. Herein we analyze the adequacy of the National Solar Radiation Database (NSRDB) to validate the WRF-Solar performance using high-quality global horizontal irradiance (GHI) observations across the CONUS. Based on the sufficient performance of NSRDB, we further analyze the WRF-Solar forecast errors across the CONUS, the growth of the forecasting errors as a function of the lead time, sensitivities to the grid spacing, and to the representation of the radiative effects of unresolved clouds. Our results based on WRF-Solar forecasts spanning the year of 2018 reveal a 7% median degradation of the mean absolute error (MAE) from the first to the second daytime period. Reducing the grid spacing from 9 km to 3 km leads to a 4% improvement in the MAE, whereas activating the radiative effects of unresolved clouds is desirable over most of the CONUS even at 3 km of grid spacing. A systematic overestimation of the GHI is found. These results illustrate the potential of GHI retrievals to contribute increasing the WRF-Solar performance.

Report Details Solar Radiation Alert and Recommendations

Space Weather ◽  
2006 ◽  
Vol 4 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Tracy Staedter
Keyword(s):  
Solar Radiation
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