Development and Research of a Promising Pumpless Liquid Cooling System for Reciprocating Compressors

Round 1

Reviewer 1 Report

o   The abstract should include more quantity results.

o   It is surprising that 37 papers were cited in the absence of Energies Journal. If the authors were unable to locate any references in this journal, the paper is most likely out of scope. Please thoroughly review and include references to the Energies journal's knowledge body. This provides readers with a sense of continuity and allows them to pace your paper in relation to what the journal has been publishing, greatly increasing the impact of your article.

 

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Author Response

Response to reviewers:

Dear Reviewers and Editor, thank you for reviewing this manuscript. Your comments have been very helpful and improved this manuscript. Please find below the details we addressed them. You may also refer to the highlighted and tracked version of the revised manuscript.

Reviewer #1: 

1. The abstract should include more quantity results.

• Thank you for your comment. We added abstract.

2. It is surprising that 37 papers were cited in the absence of Energies Journal. If the authors were unable to locate any references in this journal, the paper is most likely out of scope. Please thoroughly review and include references to the Energies journal's knowledge body. This provides readers with a sense of continuity and allows them to pace your paper in relation to what the journal has been publishing, greatly increasing the impact of your article.

• We agree with the remark. In References, we have added links to articles from the journal Energy.

Once again, we thank you for the time you put in reviewing our paper and look forward to meeting your expectations. Since your inputs have been precious, in the eventuality of a publication, we would like to acknowledge your contribution explicitly.

The authors.

Reviewer 2 Report

1. The comparison and differences between the two groups of pump-free liquid cooling systems in the introduction are insufficient, so relevant content can be added appropriately.

2. Confirm whether "ΔZ=Z1-Z2" needs to be changed to "ΔZ=Z₁-Z₂".

3. The conclusion should not be limited to the statement of experimental results, but should reflect innovative findings.

4. Pay attention to tenses, diction and grammar.

Comments for author File: Comments.docx

Author Response

Response to reviewers:

Dear Reviewers and Editor, thank you for reviewing this manuscript. Your comments have been very helpful and improved this manuscript. Please find below the details we addressed them. You may also refer to the highlighted and tracked version of the revised manuscript.

Reviewer #2: 

1. The comparison and differences between the two groups of pump-free liquid cooling systems in the introduction are insufficient, so relevant content can be added appropriately.

• Thank you for your comment. In the introduction, we have added a description of two groups of pumpless liquid cooling systems.

2. Confirm whether "ΔZ=Z1-Z2" needs to be changed to "ΔZ=Z₁-Z₂"

• Agree with the comment. The text has been amended.

3. The conclusion should not be limited to the statement of experimental results, but should reflect innovative findings. 

• Agree with the comment. We have revised the conclusion 

4. Pay attention to tenses, diction and grammar

• Corrections have been made to the text. If the language is still not clear enough, we would appreciate if you point us to specific suggestions that we should improve in the next round of revision.

Once again, we thank you for the time you put in reviewing our paper and look forward to meeting your expectations. Since your inputs have been precious, in the eventuality of a publication, we would like to acknowledge your contribution explicitly.

The authors.

Reviewer 3 Report

This is an interesting paper that explains a new design of cooling system for compressors without the need for external pump. Although the concept is interesting, the way it is explained is a little difficult to understand. Figure 1 is too intense and there are too many things shown in a single figure that distracts from the main purpose of the figure. It is suggested that Figure 1 should be simplified figure. Further figure 1 shows many labels that don’t make any sense without clear explanation. For example, what is Tc, Vc, Pc ?

 

It is important to explain equations 1 to 9 with reference to the Figure 1 or similar to relate them to the proposed system.

 

Please explain how you developed equations 10, 11 and 12? If these equations are from literature, then where is the reference. If these were developed as part of this study, then explain how these equations were developed.

 

Further when you say equation 11 is for oil, what is the type or classification of the oil and similarly what is the composition of the antifreeze for equation 12?

Please use appropriate referencing style. Properly acknowledge the authors, you say "The authors of [12] ..." , it is suggested say "ACB and team (here ABC should be replaced by the name of the first author) ..." 

 

Check all the units are correct in the nomenclature.

Check the paper for language errors.

Author Response

Response to reviewers:

Dear Reviewers and Editor, thank you for reviewing this manuscript. Your comments have been very helpful and improved this manuscript. Please find below the details we addressed them. You may also refer to the highlighted and tracked version of the revised manuscript.

Reviewer #3: 

1. This is an interesting paper that explains a new design of cooling system for compressors without the need for external pump. Although the concept is interesting, the way it is explained is a little difficult to understand. Figure 1 is too intense and there are too many things shown in a single figure that distracts from the main purpose of the figure. It is suggested that Figure 1 should be simplified figure. Further figure 1 shows many labels that don’t make any sense without clear explanation. For example, what is Tc, Vc, Pc ?

• Figure 1 is a schematic diagram with the designation of the main thermodynamic parameters for cavities. The values Tc1, Vc1, Pc1, Gс1 are the values of temperature, volume, pressure and mass in the working cavity of the left cylinder, and the values Tc2, Vc2, Pc2, Gс2 are the values of temperature, volume, pressure and mass in the working cavity of the right cylinder. It does not seem appropriate to simplify the drawing, because it is a circuit diagram, and the applied parameters are necessary for understanding the equations below. , we added the definitions into Nomenclature of all thermodynamic parameters that were indicated in Figure 1.

2. It is important to explain equations 1 to 9 with reference to the Figure 1 or similar to relate them to the proposed system.

• Equations (1-9) are the basic equations of conservation of energy (equation 1), mass (equation 2), change in the volume of the working cavity of the cylinder (equation 3), equation of state (equations 4, 5), equation of the dynamics of the movement of the self-acting closure valve (equation 6), the Newton-Richmann equation for convective heat transfer (equation 7), the equation for determining the average temperature of the cylinder-piston group (equations 8, 9). It should be noted that this system of equations was used to determine the thermodynamic parameters in the working cavities of the left and right cylinders, as well as in the cavities of constant volume, in which there is no liquid 19 and 20. When performing thermodynamic calculations in cavities of constant volume, the equation (3) and equation (6) were excluded. Due to the fact that the calculation of the change in thermodynamic parameters in the cavities written above is the same, the system of equations (1) and (6) was written in the general form.

3. Please explain how you developed equations 10, 11 and 12? If these equations are from literature, then where is the reference. If these were developed as part of this study, then explain how these equations were developed. 

• These equations were obtained from the results of experimental studies by processing the least squares method.

4. Further when you say equation 11 is for oil, what is the type or classification of the oil and similarly what is the composition of the antifreeze for equation 12? 

• We used gear:

• oils ATF DEXRON III (С=2008 J/(kg*K)) [see DOI: 10.18698/0536-1044-2020-12-40-49; URL:http://izvuzmash.ru/articles/1808/1808.pdf.];
• antifreeze G-12 (see Table 1. Main parameters of the experimental sample).

5. Please use appropriate referencing style. Properly acknowledge the authors, you say "The authors of [12] ..." , it is suggested say "ACB and team (here ABC should be replaced by the name of the first author) ..." 

• Thanks for the comments. The introduction has been corrected.

6. Check all the units are correct in the nomenclature 

• Thanks for the comments. The dimension has been checked and corrected.

7. Check the paper for language errors 

• Corrections have been made to the text. If the language is still not clear enough, we would appreciate it if, in the next round of revision, you would point us to specific suggestions that we should improve.

Once again, we thank you for the time you put in reviewing our paper and look forward to meeting your expectations. Since your inputs have been precious, in the eventuality of a publication, we would like to acknowledge your contribution explicitly.

The authors.