Optimization of the Design of a Greenhouse LED Luminaire with Immersion Cooling

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The study explores the design of high-intensity LED luminaires for modern agriculture, focusing on compact dimensions and new materials. A new material, PMS-5, is proposed as an immersion liquid with better thermal conductivity than HFE7200 and NS15. The study also highlights the importance of parameters like metal profile area, immersion liquid volume, wall thickness area, and external cylinder area in efficient top light LED luminaires. The study proposes various designs based on construction materials, technical performance, and actual operating conditions., in conclusion the study is interesting and can be considered for publication after minor revision comments are as follows.

1. Keywords: avoid using keywords which is already in title. 

2. authors are requested to clearly define the study goal in the introduction last para.

3.pl double check the Equations from 01-08 and give reference properly/

4. Discussion needs proper comparative assessment of present study with previously developed study and also prepare a table. 

5. It seems authors used AI during writing of the MS, is it? authors need to give consent

6. Conclusions seem like abstract please reframe with achieved highlight and perspectives.

Comments on the Quality of English Language

required editing

Author Response

We thank the reviewer for his careful reading of the manuscript and valuable comments that will improve the quality and significance of the article.

Comments 1: [Keywords: avoid using keywords which is already in title.]

Response 1: [Thank you for your valuable comment, which will allow you to find this job faster in the future. The keywords that appear in the title have been replaced with the following: liquid cooling; protected cultivation; artificial lighting.]

Comments 2: [Authors are requested to clearly define the study goal in the introduction last para.]

Response 2: [The text was reformulated and added to reveal the purpose of the article. Lines 84 to 87.]

Comments 3: [pl double check the Equations from 01-08 and give reference properly.]

Response 3: [We checked the references for the equations from 01-03, the correct references are set for these equations. References have been added for equations 4 and 5. Equations 06-08 are outlined by us.]

Comments 4: [Discussion needs proper comparative assessment of present study with previously developed study and also prepare a table.]

Response 4: [The discussions compare the HFE7200 immersion fluids and the PSM-5 liquid used by the authors, and clearly reflect the advantages and disadvantages of the PSM-5 liquid. The article also added the technical data of the compared liquids to the new table 3.]

Comments 5: [It seems authors used AI during writing of the MS, is it? authors need to give consent.]

Response 5: [Artificial intelligence was not used when writing the article.]

Comments 6: [Conclusions seem like abstract please reframe with achieved highlight and perspectives.]

Response 6: [The conclusions were rewrited and extended with more specific results.]

 

Reviewer 2 Report

Comments and Suggestions for Authors

Attached please find the comments.

Comments for author File: Comments.pdf

Author Response

We thank the reviewer for his careful reading of the manuscript and valuable comments that will improve the quality and significance of the article.

Comments 1: [Why was a value of 10 mm3 per unit volume chosen as the best value to evaluate? Please give calculations or references.]

Response 1: [For a simple and visual interpretation of indicators, values that are multiples of single-digit and decimal values are required. Therefore, it was important to choose a value that, firstly, would reflect the volumes of the substance most commonly found in the practical application of an LED luminaire, and secondly, these values are multiples of single values. In this regard, a value equal to 1 cm3 = 10 mm3 was chosen, which, as a single-digit (decimal) value, most often reflects the volumes encountered in the design of an LED luminaire.]

Comments 2: [Does Equation 9 contradict the upper and lower descriptions given in the correspondence? Please clarify.]

Response 2: [Thank you for noticing this typo. In equation 9, the area value should tend to the maximum. Equation 9 has been fixed.]

Comments 3: [There is a lack of data comparing the actual heat dissipation of the various LED luminaire designs mentioned in the paper (especially the design illustrated in Fig. 9), and whether the corresponding thermal resistance or heat dissipation calculations can be added to corroborate the viewpoints illustrated in this paper.]

Response 3: [The concept of the article was to obtain general dependencies reflecting thermal processes for one of the types of upper light LED luminaire with immersion cooling. And such dependencies (expressions 6-9) are obtained on the basis of conclusions and studies based on the known laws of thermal processes and empirical expressions, the confirmation of which is not required. That is, our research is based on studies previously conducted by other authors. The design proposed in Figure 9 is one of the most optimal options, based on the presented equations 6-9 and the experience of the research group. This design option is the most optimal from the point of view of the research group, an option that requires additional research and optimization, which is noted in the article (lines 364-365) and which is supposed to be shown in the following studies. Including such studies in this work would overload the article with information and would contradict the original concept. And we certainly agree with you that such studies are necessary and, as already noted, they will be reflected in the next work.]

Comments 4: [The paper lacks a description of the placement of the LED power supply unit in the actual application situation, which will affect the actual occupied area situation, please add.]

Response 4: [The power supply in the proposed design is supposed to be external and located outside the working areas of the LED luminaire. It is assumed that the power supply is placed at such a distance and in such a zone where its influence on the thermal and optical characteristics will be minimal.]

Comments 5: [In the earlier part of the text, it is said that whether glass or polycarbonate is used as the material for the transparent cylinder depends on a combination of circumstances, and in the following discussion, polycarbonate is used instead of glass, please add the reasons for the use of polycarbonate.]

Response 5: [From the authors' point of view, polycarbonate is a more preferable material, since it is cheaper and resistant to impact loads, respectively, the customer receives safer use (polycarbonate will not crack and liquid will not leak onto plants), safe and fast installation, it is easy to transport. But from the point of view of heat dissipation, glass is certainly more preferable.]

Comments 6: [The references should be expanded. Some new literatures might be help the authors to further deepen the understanding of reaction mechanism as well as newest developing in this field (Journal of Environmental Management, 2023, 326: 116790 Regeneration mechanism of a novel high-performance biochar mercury adsorbent directionally modified by multimetal multilayer loading).]

Response 6: [Thank you for your valuable opinion. We have added a number of new references. Unfortunately, we did not quite understand in what context it was possible to add the publication you mentioned (Journal of Environmental Management, 2023, 326: 116790 Regeneration mechanism of a novel high-performance biochar mercury adsorbent directionally modified by multimetal multilayer loading. If you had written in more detail in what context it should be related to our work, we would have definitely added it.]

Reviewer 3 Report

Comments and Suggestions for Authors

The whole process of the paper is in design and theoretical analysis, without any test, or even simulation experiment, which can not explain the advantages and feasibility of the research. It is suggested to design the test submission again.

Author Response

We thank the reviewer for a careful reading of the manuscript and valuable comments that will improve the quality and significance of the article.

Comments : [The whole process of the paper is in design and theoretical analysis, without any test, or even simulation experiment, which can not explain the advantages and feasibility of the research. It is suggested to design the test submission again.]

Response : [The concept of the article assumed theoretical studies based on well-known thermal laws and empirical expressions. In this regard, the basis for the presented calculations and the obtained dependencies and expressions were the studies of other authors, including their experimental work.]

 

 

Reviewer 4 Report

Comments and Suggestions for Authors

The paper titled “Optimization of the design of a greenhouse LED luminaire with immersion cooling” offers valuable insights and is likely to capture the attention of researchers in the field. In this paper, the theoretical evaluation of the influence of different materials on the efficiency of removal of thermal energy from LEDs was shown. At the same time, there were proposed designs that provide both, maximum effective cooling of the light source and designs whose efficiency is somewhat reduced in order to achieve better operational performance. These work will have important implications for agricultural production.

In addition, the observation that the author introduces us well to the existing problems and deficiencies of the current LSD, which the author does very well in the introduction section of the manuscript, is commendable.

While the manuscript is straightforward and can be acceptable, there are some areas that could benefit from further clarification and revision. Therefore, the authors are encouraged to carefully review the feedback provided below and make modifications accordingly：

General comments:

1）The correct writing format of the paper title should be "Optimization of the Design of　 A　Greenhouse LED Luminaire with Immersion Cooling".

2）I want to know if the author considered the life of the tube in designing and improving the LED material. This is actually very important, does it have its life improved compared to the previous material?

3）As we all know, the requirements of agricultural production for devices often take into account its cost input. The authors should make a simple assessment of them.

In short, I am satisfied with the writing and content of this manuscript. In particular, the discussion of the results is well done and does not require significant changes. However, I suggest that the writing format of all references should be examined. You can refer to Stewart et al. 's article for targeted modification.（Batista, E.R.; May, A.; Procópio, S.O.; Assalin, M.R.; Quevedo, H.D.; Binhardi, N.; Queiroz, S.C.N. Use of Conyza canadensis L. Extracts as Biostimulant in Cyclamen persicum Mill. AgriEngineering 2024, 6, 2926–2941. doi.org/10.3390/ agriengineering6030168).

Author Response

We thank the reviewer for a careful reading of the manuscript and valuable comments that will improve the quality and significance of the article.

Comments 1: [The correct writing format of the paper title should be "Optimization of the Design of　 A　Greenhouse LED Luminaire with Immersion Cooling".]

Response 1: [Thank you for your valuable edits. We have reworked the title format.]

Comments 2: [I want to know if the author considered the life of the tube in designing and improving the LED material. This is actually very important, does it have its life improved compared to the previous material?]

Response 2: [We also agree with the importance of the idea of assessing the impact of the study on the service life of the LED luminaire. It is safe to say that immersion cooling of LED luminaire will improve the removal of thermal energy, and therefore increase the service life of the developed LED luminaire. This is also evidenced by the studies conducted by other authors. However, in our work, we did not conduct a quantitative assessment of this factor, since this would lead to a significant increase in the volume of additional information in the article. Such a topic should be studied in a separate study.]

Comments 3: [As we all know, the requirements of agricultural production for devices often take into account its cost input. The authors should make a simple assessment of them.]

Response 3: [In general, the cost of the LED luminaire requires a separate assessment, but the following aspects can be highlighted. The key ones are two. The first allows for better cooling of the LEDs, which means increasing their service life and delaying the replacement of the equipment. The second aspect allows, due to better cooling, to increase the intensity of the luminous flux from the LEDs and/or reduce their dimensions, which will reduce the number of LED luminaires required to achieve the desired intensity, and therefore the overall price of the lighting equipment. Also, a smaller number of LED luminaires and smaller dimensions will allow for less shading of the sun in a limited space and thereby achieve a higher crop yield.]

Comments : [In short, I am satisfied with the writing and content of this manuscript. In particular, the discussion of the results is well done and does not require significant changes. However, I suggest that the writing format of all references should be examined. You can refer to Stewart et al. 's article for targeted modification.（Batista, E.R.; May, A.; Procópio, S.O.; Assalin, M.R.; Quevedo, H.D.; Binhardi, N.; Queiroz, S.C.N. Use of Conyza canadensis L. Extracts as Biostimulant in Cyclamen persicum Mill. AgriEngineering 2024, 6, 2926–2941. doi.org/10.3390/ agriengineering6030168).]

Response : [Thank you for your high assessment of our work. We checked the format of the links and made corrections to the links.]

Round 2

Reviewer 2 Report

Comments and Suggestions for Authors

All the questions have been answered satisfactorily. I think the manuscript can be published in its present form.

Reviewer 3 Report

Comments and Suggestions for Authors

None