scholarly journals Experimental study on the thermal performance of a solar collector and the effect of the tilt angle on the collector efficiency

2018 ◽  
Vol 454 ◽  
pp. 012135
Author(s):  
A R Alkumait ◽  
F M Abed ◽  
Mina A. Nashat
Keyword(s):  
Experimental Study ◽  
Thermal Performance ◽  
Tilt Angle ◽  
Solar Collector ◽  
Collector Efficiency

scholarly journals EXPERIMENTAL STUDY OF STEAM GENERATION BY PARABOLIC TROUGH CONCENTRATOR WITH TWO AXES TRACKING

2021 ◽  
Vol 25 (Special) ◽  
pp. 2-15-2-24
Author(s):  
Yasameen S. Raheema ◽  
◽  
Bashar O. Bedaiwi ◽  
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Thermal Performance ◽  
System Performance ◽  
Solar Collector ◽  
Solar Concentrator ◽  
Steam Generation ◽  
Parabolic Trough ◽  
Parabolic Trough Solar Collector ◽  
Practical Investigation

This paper describes an experimental model for estimating parabolic trough solar collector performance, as the Arduino micro-controller technology was applied to improve the optical and thermal efficiency of the system. The receiving tubes of different internal diameters (2mm, 6mm) were implemented to evaluate system performance. The practical investigation of the solar concentrator was conducted to generate steam at moderate temperatures, as the experiments were executed in Baghdad with geographical coordinates (33° 18' N, 44° 21' E) during specific days. The results showed the effectiveness of small diameters, as the significant enhancement of thermal performance was at a flow rate of 8 L/h and receiver tube diameters of 2 mm, as the improvement was 30% compared to 6 mm tubes.

Experimental and numerical assessments of the effects of vacuum and solar film on the performance of low concentration eccentric solar collector

2021 ◽  
pp. 1-19
Author(s):  
Mavd P. R. Teles ◽  
K.A.R. Ismail
Keyword(s):  
Thermal Performance ◽  
Solar Collector ◽  
High Efficiency ◽  
Numerical Code ◽  
Working Fluid ◽  
Solar Collectors ◽  
Low Concentration ◽  
Lack Of Information ◽  
Collector Efficiency ◽  
Volume Method

Abstract Low concentration collectors are usually recommended for water heating and refrigeration systems. The literature reveals lack of information on numerical modeling, experimental data, and thermal performance of eccentric evacuated double tube solar collectors. This study is focused on eccentric solar collectors since this arrangement allows adequate concentration for achieving relatively high temperatures while having small size and occupying less space. The effects of the vacuum in the annular space and reflective film on the enhancement of working fluid heating and overall thermal performance were also assessed. An in-house numerical code using finite volume method was used to discretize the conservation equations and the predictions were validated by experimental results obtained from an experimental rig that was constructed and instrumented for outdoor tests. The experiments were performed in the city of Campinas-Brazil during the autumn season. The investigated versions of the eccentric double tube solar collector include a version with a reflective film and vacuum, a second version with a reflective film but without vacuum, a third arrangement without a reflective film but with vacuum and finally a version without both a reflective film and vacuum. The results showed that the version with reflective film and vacuum demonstrated high efficiency achieving 89%. The lowest efficiency of 42% was achieved by the version without both reflective film and vacuum. The comparative analysis of the four versions shows that the incorporation of reflective film increases the collector efficiency by 28%, while the vacuum increases the efficiency by about 1.3%.

scholarly journals Experimental Study of Innovative Indirect Solar Dryers

2021 ◽  
Vol 39 (4) ◽  
pp. 1313-1320
Author(s):  
Tadahmun A. Yassen ◽  
Manar S.M. Al-Jethelah ◽  
Hussam S. Dheyab
Keyword(s):  
Experimental Study ◽  
Flat Plate ◽  
Air Temperature ◽  
Thermal Performance ◽  
Solar Collector ◽  
Temperature Variations ◽  
Testing Method ◽  
Solar Dryer ◽  
Flat Plate Solar Collector ◽  
Drying Chamber

The present work experimentally studied two novel solar dryers’ designs, novel indirect solar dryer (NISD) and novel mixed indirect solar dryer (NMISD). The purpose behind this work is to compare the thermal performance of the proposed dryers with that of a traditional indirect solar dryer (TISD). The testing method involved building and thermally testing the three dryers. The NISD is a novel drying chamber with three absorbed surfaces. The NMISD consisted of a flat plate solar collector and NISD. The air temperature at the drying chamber entrance increased by 60% and 68% for the TISD and NMISD, respectively. In the lower space of the drying chamber, the air temperature was decreased by 35% while increased by 39% for the NISD and NMISD, respectively, compared to the TISD. The air temperature in the upper space of the drying chamber increased by 14% and 49% for the NISD and NMISD, respectively, compared to the TISD. The temperature variations through the drying chamber were -26%, 33%, and 3% in the TISD, NISD, and NMISD, respectively. The thermal efficiencies of the NISD and NMISD were 9% and 55%, respectively, higher than the TISD’s.

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