Evaluation and comparison of performance of a solar pebble absorber collector with a conventional flat plate collector

Author(s):  
N. Channa Keshava Naik ◽  
K.S. Shashi Shekar
Author(s):  
DALWADI M.D. ◽  
NAIK H.K. ◽  
PADHIAR R.D. ◽  
RANA S.S. ◽  
CHAVDA N.K. ◽  
...  

2018 ◽  
Author(s):  
M. T. Nitsas ◽  
I. P. Koronaki ◽  
L. Prentza

The utilization of solar energy in thermal energy systems was and always be one of the most effective alternative to conventional energy resources. Energy efficiency is widely used as one of the most important parameters in order to evaluate and compare thermal systems including solar collectors. Nevertheless, the first law of thermodynamics is not solely capable of describing the quantitative and qualitative performance of such systems and thus exergy efficiency is used so as to introduce the systems’ quality. In this work, the performance of a flat plate solar collector using water based nanofluids of different nanoparticle types as a working fluid is analyzed theoretically under the climatic conditions in Greece based on the First and Second Law of Thermodynamics. A mathematical model is built and the model equations are solved iteratively in a MATLAB code. The energy and exergy efficiencies as well as the collector losses coefficient for various parameters such as the inlet temperature, the particles concentration and type are determined. Moreover, a dynamic model is built so as to determine the performance of a flat plate collector working with nanofluids and the useful energy that can be stored in a water tank. The exergy destruction and exergy leakage are determined for a typical day in summer during which high temperatures and solar intensity values are common for the Greek climate.


1981 ◽  
Vol 103 (4) ◽  
pp. 291-298 ◽  
Author(s):  
P. Raghuraman

Two separate one-dimensional analyses have been developed for the prediction of the thermal and electrical performance of both liquid and air flat-plate, photovoltaic/thermal (PV/T) collectors. The analyses account for the temperature difference between the primary insolation absorber (the photovoltaic cells) and secondary absorber (a thermal absorber flat plate). The results of the analyses are compared with test measurements, and therefrom design recommendations are made to maximize the total energy extracted from the collectors.


2021 ◽  
pp. 100028
Author(s):  
L. Syam Sundar ◽  
V. Punnaiah ◽  
Manoj K. Singh ◽  
António M.B. Pereira ◽  
António C.M. Sousa

Solar Energy ◽  
1996 ◽  
Vol 58 (1-3) ◽  
pp. 45-48 ◽  
Author(s):  
N. Benz ◽  
Th. Beikircher ◽  
B. Aghazadeh

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