Performance Assessment of Low-Temperature Solar Collector with Fullerenes C60 Manufactured at Low Cost in an Emerging Country

Round 1

Reviewer 1 Report

Dear authors:

1. Strengthen the introductory section with some authors who work and compare mixtures of nanofluids with water against only water as working fluid.
2. According to the results, the size of the nanoparticle is of the utmost importance, therefore: How do you have control of the particle size of the nanofluid when it is produced, if it is ground manually?
3. What is the procedure to determine when the nanoparticle has the right size?
4. Has any comparison been made of the properties of its nanoparticle with respect to those reported in the literature? If so, attach it.
5. Attach the details of the specialized software in which the simulation was performed. Since it is of utmost importance for the results.
6. According to the authors, the LTSC is a collector capable of using direct absorption. What type of simulator was used to carry out the experimental tests?. Since in the images it is observed inside a closed space.
7. Add image of the experimental setup. Where the LTSC can be observed.
8. Figures 7a and 7b must be adjusted to show the results with a larger scale. (Edit axis scale)
9. Figure 8 should be adjusted in the same way as figure 7. To improve the quality of the displayed results.
10. Figure 3 could be avoided, it does not provide data of interest.
11. The title of the work could be modified, since it is more focused on the production of the nanoparticle than on the performance of the LTSC.
12. Strengthen the conclusion section with new perspectives on nanoparticles and their manufacture.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

Performance assessment of low temperature solar collector with Fullerenes C60 in an emerging country is very interesting paper. Some improvement is required!

 Line 79: as well as black metal oxide particles (which type of metal oxide?)

Line 96: ultrasound treatment is recommended (which type of Ultrasound treatment; Which device? What is a frequency of ultrasound?)

Line 110: of water-based Al2O2 ( or Al₂O₃)

Line 189: Thermochermophysical properties of water and nanoparticles at 300 K [25]. (Why surface tension of water is not included in this table?)

Line 212: With this device, thin sheets of C60 macromolecules (Fullerene C60 Nanomaterial) are produced by hand? What are safety measure during working with nanoparticles? These particles are very active. During grinding it can be flammable.

Line 324: Volume fraction [] to write Volume fraction [%]

Line 340: Please to write an unit for x-axis for Figure 11.

Line 414: Please to write for Figure 16. Efficiency [%]  instead Efficiency []

Conclusion

 Line 426: it is possible to produce carbon nanoparticles at a low cost and in an accessible manner, (what is with safety and production rate)

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

Low temperature solar collectors with C60 nanostructures. Good topic to explore.

 

Figure 5 could be obtained with better quality?

 

In figure 7, you should have a zoom in between 700 and 1100 W/m2 for better view of the data points.

Modify format of Figure 8, as you have it in Figure 7.

Figure 12 b should be improved, the numbers in red are very limited to be seen...

I would recommend you to search for more recent references (>2020).

Also, reveiw your english grammar and "conectivity" among your manuscript parragraphs.

 

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

The authors made the changes based on the comments and the quality of the work increased.