Application of nanofluid to improve the thermal performance of horizontal spiral coil utilized in solar ponds: Geometric study

Solar energy is being used in many ways, but the easiest to trap solar energy is solar pond. Solar Ponds absorb the solar energy and the absorbed solar energy will be taken away by a streaming fluid. A non-convective solar pond has been constructed to investigate the temperature variations of it, in the weather conditions of Pachapalayam, Coimbatore. Solar pond with a surface area of 1.7m2, a depth of 0.5m has been built-up and an inflexible surface is maintained at the bottom using a dark-colored (blackened) HDPE sheet, thermo styrene for capturing the heat in a good amount. Measurement of the temperature at depths of 0.05, 0.1. 0.2, 0.25, 0.3, 0.35, 0.4 0.45, m from the base of the pond and ambient temperature were taken using washer type thermocouples. Solar radiations were taken during a period of 10 days of experimentation using a solar power meter. In this experimental work investigated the performance of solar pond with NaCl salt and coal cinder

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Computer simulation modelling, thermal performance and design optimisation for solar ponds in Greece

Solar & Wind Technology ◽

10.1016/0741-983x(88)90062-8 ◽

1988 ◽

Vol 5 (6) ◽

pp. 645-652 ◽

Cited By ~ 13

Author(s):

P.T. Tsilingiris

Keyword(s):

Computer Simulation ◽

Thermal Performance ◽

Simulation Modelling ◽

Design Optimisation ◽

Solar Ponds

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Thermal Performance Improvement of Solar Parabolic Dish System Using Modified Spiral Coil Tubular Receiver

International Journal of Photoenergy ◽

10.1155/2021/4517923 ◽

2021 ◽

Vol 2021 ◽

pp. 1-18

Author(s):

Rajkumar Malviya ◽

Prashant V. Baredar ◽

Anil Kumar

Keyword(s):

Thermal Performance ◽

Maximum Efficiency ◽

Working Fluid ◽

Outlet Temperature ◽

Anodized Aluminum ◽

Innovative Design ◽

Spiral Coil ◽

Parabolic Dish ◽

Turbulence Effect ◽

Solar Thermal Applications

The present research intends to design an efficient receiver for solar thermal applications with a solar dish concentrator system. Thermal and dynamic analysis is carried out for different convolutions of a spiral coil, and experiments are performed for testing the modified absorber. Experimental results are validated for the spiral absorber with numerical results. Three receivers of different numbers of convolutions are analyzed, and simulation steps are performed for these receivers to make improvements in the system efficiency. Finally, 5 convolutions of a spiral coil tubular absorber are taken for the modified design of the system. Absorber position for every spiral convolution is kept at the focus of the concentrated solar dish collector to achieve maximum efficiency. Material used for the reflective surface is anodized aluminum and copper for the absorber. The diameter of the aperture for the parabolic dish collector is 1.4 m. The maximum absorber temperature for May month comes out to be 296°C, and the maximum working fluid outlet temperature is found to be 294.2°C which is near to simulating temperature of 289.59°C and 288.15°C, respectively. This innovative design of the absorber consists of a feature of a 5 mm extension to the spiral tube at the exit and entry; hence, the turbulence effect could be overcome. Experimental thermal efficiency was found the highest (i.e., η th max = 75.98 % ) for May. This work emphasizes on improving thermal performance by obtaining optimum absorber size using convolution strategy. Investigation of 5 convolutions of spiral coil tubular absorber with extended ends for obtaining optimum performance than existing work is the superiority of this work.

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