Thermal Performance Improvement Study of a Solar Collector with Compound Parabolic Concentrator
30 Nov 2018-European Journal of Engineering Research and Science (European Open Access Publishing (Europa Publishing))-Vol. 3, Iss: 11, pp 78-82
TL;DR: In this paper, a 0.81m2 solar collector with a compound parabolic concentrator was used to achieve better thermal performance compared with a flat plate collector with reflector.
Abstract: Heating water with solar energy is easy and effective in both domestic and industrial areas. The initial implementation cost of a solar-water-heating system is high but long term use of it makes it cost effective. For geographical location, Bangladesh is very suitable for using it. In a solar collector system, collector area is an important design factor. To achieve better thermal performance, 0.81m2 solar collector was used in this study. Commonly used flat plate collector takes more space to be installed. In Bangladesh, space on the roofs of houses and industries are limited and so there is a little scope to use flat plate collector system. Compound parabolic collector can solve this problem. Solar collector with compound parabolic collector needs less space than flat plate collector with reflector. When compound parabolic concentrator was attached with the solar collector, thermal performance improves. Compare with other alternatives that improve thermal efficiency, compound parabolic concentrator shows better thermal performance. Compare thermal efficiency of the consecutive three months. In this system, when water flow rate increase, outlet water temperature decrease but thermal efficiency increases. It is also observed that when solar intensity increases, thermal efficiency also increases likewise when solar intensity decreases, thermal efficiency also decreases. In this research, outputs of different similar researches are compared to show the effectiveness of the compound parabolic concentrator based solar collector. The compound parabolic concentrator reflects more solar radiation, eventually directs it to the collector and increased the difference between the inlet and outlet water temperature.
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References
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01 Jan 2015
12,972 citations
"Thermal Performance Improvement Stu..." refers background in this paper
...The result shown that this system is more effective for application of solar energy [6] A....
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TL;DR: A survey of the various types of solar thermal collectors and applications is presented in this paper, where an analysis of the environmental problems related to the use of conventional sources of energy is presented and the benefits offered by renewable energy systems are outlined.
2,620 citations
"Thermal Performance Improvement Stu..." refers background in this paper
...Where, x is the thickness of the insulation and K is the insulation thermal conductivity [10]....
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TL;DR: In this paper, the state-of-the-art on flat plate PV/T collector classification, design and performance evaluation of water, air and combination of water and/or air based.
Abstract: Flat plate photovoltaic/thermal (PV/T) solar collector produces both thermal energy and electricity simultaneously. This paper presents the state-of-the-art on flat plate PV/T collector classification, design and performance evaluation of water, air and combination of water and/or air based. This review also covers the future development of flat plate PV/T solar collector on building integrated photovoltaic (BIPV) and building integrated photovoltaic/thermal (BIPVT) applications. Different designs feature and performance of flat plate PV/T solar collectors have been compared and discussed. Future research and development (R&D) works have been elaborated. The tube and sheet design is the simplest and easiest to be manufactured, even though, the efficiency is 2% lower compared to other types of collectors such as, channel, free flow and two-absorber. It is clear from the review that for both air and water based PV/T solar collectors, the important key factors that influenced the efficiency of the system are the area where the collector covered, the number of passes and the gap between the absorber collector and solar cells. From the literature review, it is obvious that the flat plate PV/T solar collector is an alternative promising system for low-energy applications in residential, industrial and commercial buildings. Other possible areas for the future works of BIPVT are also mentioned.
363 citations
TL;DR: In this paper, the electrical and thermal performances of photovoltaic thermal (PVT) water collectors were determined under 500-800 W/m2 solar radiation levels, and the results showed that the spiral flow absorber exhibited the highest performance at a solar radiation level of 800-W/m 2 and mass flow rate of 0.041 kg/s.
353 citations
TL;DR: In this paper, a solar reflector was used with the solar collector to increase the reflectivity of the collector, and the reflector concentrates both direct and diffuse radiation of the sun toward the collector.
140 citations
Additional excerpts
...Bhowmik, which shows similar thermal efficiency [12]....
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