A stationary evacuated collector with integrated concentrator

Snail, Keith A.; O’Gallagher, J.; Winston, R.

doi:10.1016/0038-092x(84)90196-8

Cited by 36 publications

(12 citation statements)

References 11 publications

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“…And thus, a tracker may be required, consequentially increasing the expenses, which is undesired. In order to obtain a reasonably large concentration ratio, and meanwhile, permit stationary operation throughout the year, θ c is chosen to be 35°as the acceptance half angle of the current CPC collector [22].…”

Section: The Acceptance Half Angle (θ C ) Of the Cpc Collectormentioning

confidence: 99%

“…Modified integrated compound parabolic solar concentrator L. Chen, J.-X. Chen and X.-R. Zhang loss because of the gap between the absorber and the reflector [22]. The values for the optical properties of the collector are shown in Table II.…”

Section: Optical Efficiency Of the Cpc Collectormentioning

confidence: 99%

“…For research aspect, since 1980s, many researchers focused on the improvement of thermal performance and geometric designs of CPCs. For example, O'Gallagher et al [21,22] proposed a new evacuated collector with circular receiver inside CPC system, where the concentrator is sealed to maintain its inner vacuum status and analyzed into detail the basic optic and thermal efficiencies. Since the first trough solar power plant in 1984, more than 10 trough solar power plants were established in California of the USA, ranging from 14 to 80 MW (with the total amount around 350 MW and accounting for 80% percent of the world total amount), and they are now still working there.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation on the optical and thermal performance of a modified integrated compound parabolic solar concentrator

Chen

Zhang

2015

Int. J. Energy Res.

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SUMMARYIn this study, two dimensional parabolic collectors with tubular absorber are systematically analyzed. For more effective practical design, modifications are made in the profile of the collector, for example, truncating the reflector to a lower height, making a gap between the absorber and the reflector, maintaining a vacuum space inside the collector, and so on. By using ray tracing method, a numerical model is developed to study the performance of the modified collector. In the analysis, Beijing city is taken as one basic case; the collector orientation effect is discussed in a quantitative way. It is found that east-west orientation is best for the current collector. Seasonal collector performances are carefully simulated for different latitude conditions in this study. The results indicate that it is better to regulate the collector once in a season. The optimal collector slope angles for different periods are also identified in this study.

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Section: The Acceptance Half Angle (θ C ) Of the Cpc Collectormentioning

confidence: 99%

Section: Optical Efficiency Of the Cpc Collectormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical simulation on the optical and thermal performance of a modified integrated compound parabolic solar concentrator

Chen

Zhang

2015

Int. J. Energy Res.

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“…The thermal efficiency of the solar concentrator can be obtained by the ratio of the useful energy gain to the incident radiation on the aperture of concentrator. In this case, the thermal efficiency can be expressed as [7][8][9]: …”

Section: Figure 2 Organic Rankine Cycle Using a Non-imaging Concentrmentioning

confidence: 99%

Evaluation of an Organic Rankine Cycle Using a Non-Imaging Solar Concentrator for Different Working Fluids

Ustaoğlu

Okajima²,

Zhang³

et al. 2015

A P J Eng Sci

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The Organic Rankine Cycle (ORC) is a feasible technology that can be applied for small-scale power generation in residential and commercial buildings. However, a solar thermal power plant may not compete with that of a thermal power plant using conventional heat source such as coal or natural gas but environmental impact. On the other hand, the cost of a power plant may be reduced by improving the system performance. Using non-imaging concentrators can eliminate the necessity of sun tracking system. Covering the concentrators by evacuated glass tube can reduce the heat loss from the absorber, and improves the effective life-cycle of optical components. Therefore, a nonimaging concentrator was considered as a steam generator of solar power plant. In order to evaluate the system performance, simulations were conducted by using aspen HYSYS software for different working fluids. The maximum performance is obtained for the case of R-141b for the pressure difference of 39 bars to be 15.3%. The best performance improvement is attained for water and R-141b to be about 8.2% and 7.8%, respectively. The working fluid, R-141b shows a better performance due to its lower boiling point and may be preferable for small scale applications.

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“…Johannsen [1] has discussed about the improvements due to regenerating solar collectors. A multiple layer solar collector [2], evacuated and concentrating collectors [3] can also improve the performance of the overall system. Several investigations have also been reported to improve the performance of solar water heating systems employing standard collectors and storage tank.…”

Section: Introductionmentioning

confidence: 99%