Direct Absorption Solar Collector: Use of Nanofluids and Biodegradable Colloids

Nguyen, Linna V.; Kosinski, Pawel; Balakin, Boris V.; Kosinska, Anna

doi:10.2139/ssrn.4341388

Cited by 1 publication

(6 citation statements)

References 38 publications

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“…Generally, as also discussed in 17 , the actual temperature increase observed in the experiments is lower than the one obtained from the simulations. The halogen lamps not only heat the fluid through radiation absorption but also raises the temperature of the glass wall in the pipe system, leading to higher heat transfer to the fluid due to the radiating lamps.…”

Section: Simulation Resultsmentioning

confidence: 58%

“…Here, we compare our results with those reported in the literature. For instance, in our previous paper 17 , we investigated the performance of a DASC consisting of a set of pipes irradiated by a halogen lamp. In line with the current study, we used the same type of nanofluid, and the maximum performance of the setup was also observed at concentrations around 0.005-0.010%.…”

Section: Resultsmentioning

confidence: 99%

“…In our latest research, as described in 17 , we determined that K base was 186 m −1 for the same type of halogen lamp (i.e., the wavelength spectrum) and a fluid depth of 5 mm. However, in another paper of ours, as cited in 15 , we estimated K base to be 37 m −1 for larger fluid depths.…”

Section: Resultsmentioning

confidence: 99%

“…Then, the suspension was subjected to treatment in a Branson 3510 (130 W, 40 kHz) ultrasonic bath for an hour. It should be noted that this method has been used in our previous studies, such as [15][16][17] . This technique produces homogeneous nanofluids that remain stable for at least several months.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…The selection of the extinction coefficient is generally not straightforward in mathematical modelling. In addition to the fluid properties and light wavelength, this coefficient also depends on the fluid depth subject to irradiation, due to the Rayleigh scattering (for more information, see 17 ). Therefore, following 17 , we tested these values of the coefficient: 186 m −1 for water (corresponding to the lowest nanoparticle concentrations), 730 m −1 for the optimum concentration corresponding to 0.005-0.010%, and, for comparison, 5000 m −1 , which mimics significantly higher concentrations.…”

Section: Modellingmentioning

confidence: 99%

See 4 more Smart Citations

Exploring the use of nanofluids in pump-free systems for solar thermal applications

Kosinska

Balakin

Kosinski

2023

Preprint

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By using nanofluids as a working fluid in pump-free designs, thermal energy systems can become more efficient and have reduced maintenance costs, ultimately extending the system’s lifespan. In this paper, our goal is to investigate unsteady phenomena in the irradiation process and highlight their significance. To accomplish this, we conducted a series of experiments using a square loop of glass pipes filled with carbon black nanofluids and irradiated with a halo-gen lamp to simulate solar irradiation. The resulting convective motion of the nanofluids allowed us to observe the performance of different concentrations of carbon black, with 0.005-0.01 wt.% proving to be the most effective. Additionally , we identified unsteady processes that occur at the beginning of the process or when the irradiation changes. Finally, we employed computational fluid dynamics simulations to gain further insight into these phenomena.

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Section: Simulation Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%