Characterization and stability analysis of oil-based copper oxide nanofluids for medium temperature solar collectors

2019 ◽  
Vol 50 (3) ◽  
pp. 311-319 ◽  
Author(s):  
J. Akhter ◽  
S.I. Gilani ◽  
H.H. Al-kayiem ◽  
M. Ali ◽  
F. Masood
Keyword(s):  
Stability Analysis ◽  
Copper Oxide ◽  
Solar Collectors ◽  
Medium Temperature

scholarly journals Ray Tracing Study of Optical Characteristics of the Solar Image in the Receiver for a Thermal Solar Parabolic Dish Collector

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Saša R. Pavlovic ◽  
Velimir P. Stefanovic
Keyword(s):  
Ray Tracing ◽  
Low Cost ◽  
Optical Design ◽  
Solar Concentrator ◽  
Solar Collectors ◽  
Focal Distance ◽  
Medium Temperature ◽  
Parabolic Dish ◽  
Parabolic Dish Concentrator ◽  
Temperature Levels

This study presents the geometric aspects of the focal image for a solar parabolic concentrator (SPC) using the ray tracing technique to establish parameters that allow the designation of the most suitable geometry for coupling the SPC to absorber-receiver. The efficient conversion of solar radiation into heat at these temperature levels requires a use of concentrating solar collectors. In this paper detailed optical design of the solar parabolic dish concentrator is presented. The system has diameter D=3800 mm and focal distance f=2260 mm. The parabolic dish of the solar system consists of 11 curvilinear trapezoidal reflective petals. For the construction of the solar collectors, mild steel-sheet and square pipe were used as the shell support for the reflecting surfaces. This paper presents optical simulations of the parabolic solar concentrator unit using the ray tracing software TracePro. The total flux on the receiver and the distribution of irradiance for absorbing flux on center and periphery receiver are given. The goal of this paper is to present the optical design of a low-tech solar concentrator that can be used as a potentially low cost tool for laboratory scale research on the medium-temperature thermal processes, cooling, industrial processes, polygeneration systems, and so forth.

scholarly journals Towards a Standard Testing Methodology for Medium-temperature Solar Collectors with Variable Geometry

2014 ◽  
Vol 57 ◽  
pp. 2904-2913 ◽  
Author(s):  
Fabienne Sallaberry ◽  
Ramon Pujol-Nadal ◽  
Alberto Garcia de Jalón ◽  
Víctor Martínez-Moll
Keyword(s):  
Variable Geometry ◽  
Solar Collectors ◽  
Medium Temperature ◽  
Testing Methodology ◽  
Standard Testing

Thermal performance of a low and medium temperature flat plate solar collector when controlling the output-input temperature difference and the tilt angle

2021 ◽  
pp. 1-17
Author(s):  
García-Rincón Marco Antonio ◽  
Flores-Prieto José Jassón ◽  
Montoya-Márquez Orlando
Keyword(s):  
Flat Plate ◽  
Temperature Difference ◽  
Vertical Position ◽  
Solar Collectors ◽  
Medium Temperature ◽  
Joule Effect ◽  
Heat Flow Calorimetry ◽  
Flat Plate Solar Collector ◽  
Overall Heat Loss Coefficient ◽  
Indoor Conditions

Abstract This work presents a sensitivity analysis of the overall heat loss coefficient UL and the thermal efficiency η in low and medium temperature encapsulated flat plate solar collectors when controlling the output-input temperature difference ΔT and the angle of inclination β. The UL and η were determined using heat flow calorimetry at indoor conditions, emulating the solar radiation by the Joule effect and a PID control. The angle of inclination β range was 0-90°, and the ΔT range was 5.0-25.0 K. The ambient temperature and the mass flow rate were preset for each test. The UL experimental uncertainty was ±0.85 W/m2K for the inclination range of 0-45° and ±0.27 W/m2K for the inclination range of 45-90°. The results matched previous outcomes with a difference of up to 0.3 W/m2K. The UL behaved exponentially as β increased from horizontal to vertical position and linearly with ΔT. It was also observed that the UL and the efficiency were sensitive to the confined airflow variations. This model shows a sensitivity of low and medium temperature flat plate solar collectors, as the efficiency increased 140% when β was raised and 40% with ΔT.

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