Abstract
            Solar parabolic trough collector is one of the most efficient and an effective technology to deal with environmental pollution and it has gained much attention due to the recent energy demand. The solar parabolic trough collector is one of the most promising techniques for absorbing the heat from the sun. This heat is utilized for electricity generation and other industrial heating applications. This paper describes the theoretical and experimental assessment of performance of the circular and elliptical absorbers used in solar parabolic trough collector. The absorber tube of parabolic trough collector is used to transfer the heat to the working fluid. The working fluid considered over here is water which is the best operating medium in direct steam generation. The mass flow rate of water in absorber tube is analyzed in 3 stages as 0.016, 0.024 and 0.030 kg/s respectively. The experimental test is done in Chennai-Tamilnadu, Southern part of India which experiences a superior temperature throughout the year. The experiment is conducted for the period of one year from June 2015 to May 2016. The performance improvement focuses on collector efficiency, useful heat transfer rate, outlet temperature of working fluid, temperature gradient, overall heat transfer rate and the thermal losses.
Highlights
In the recent decades solar energy with the advancement in technology became the best energy resource for reducing the power demand from the non-renewable sources like coal, petroleum products etc
The experimentally found result as shown in fig.2 reveals that the proposed system with the elliptical absorber has high heat transfer rate when compared to the ordinary circular absorber
The solar radiation is utilized maximum in the elliptical absorber resulting in better outlet temperature and comparatively high temperature gradient
Summary
In the recent decades solar energy with the advancement in technology became the best energy resource for reducing the power demand from the non-renewable sources like coal, petroleum products etc. Michael Geyer and Eckhard Lupfert have proposed and experimentally constructed Euro Trough (ET) parabolic collector ET100 and ET150 for high performance with the standard receiver and reflecting mirror panel They added a finite element analysis validation with their experimental work and concluded that their proposed system has reduced weight and cost reduction [7]. Finite Volume Method (FVM) is employed in direct steam generation thermal plant, for improving the heat transfer rate in absorber computational fluid dynamics study has been done and the results are evaluated with the experimental value [11]. The various studies have been done on the performance improvement on absorber of SPTC for various purposes like heating applications and mainly for power generation In this present study elliptical absorber was designed, constructed and investigated theoretically and experimentally under different water mass flow rate and inlet water temperature
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