Review Reports

Round 1

Reviewer 1 Report

According to OPEC data, the average daily oil consumption is expected to increase by 10.2 million barrels during the period from 2021 to 2040 to reach 109.4 barrels per day by the year 2040. This trend can lead to the depletion of sources of light crude oil. To cover the deficit, alternative raw materials are being sought such as oil shale. The development of new heaters or the improvement of existing ones necessary for the effective production of valuable products from oil shale directly in situ is relevant and interesting.

Small remarks:

1) Figures 4 (page 6 line 167), 7 (page 7 line 190), 9 (page 8 line 211) it would be desirable to increase especially the values of the axes and the legend. 

2) Figures 5 and 6 should probably be better combined to show how the inside diameter affects temperature and pressure.

3) Table 1 (page 9 line 234) should be corrected to table 2.

Author Response

Manuscript number:  applsci-1898774 

Paper title:  Heat Transfer Performance of a Downhole Electric Tubular Resistive

Heater

Authors:  Yu Chen, Hao Zeng, Jianli Wang, Haoran Chen, Jianjun Zhu

 

Firstly, we gratefully appreciate the reviewers for their helpful comments and suggestions. We have taken your comment seriously and revised our paper thoroughly. The answers to your recommendations are as follows.

Reviewer 1#

According to OPEC data, the average daily oil consumption is expected to increase by 10.2 million barrels during the period from 2021 to 2040 to reach 109.4 barrels per day by the year 2040. This trend can lead to the depletion of sources of light crude oil. To cover the deficit, alternative raw materials are being sought such as oil shale. The development of new heaters or the improvement of existing ones necessary for the effective production of valuable products from oil shale directly in situ is relevant and interesting.

Small remarks:

Comment 1: Figures 4 (page 6 line 167), 7 (page 7 line 190), 9 (page 8 line 211) it would be desirable to increase especially the values of the axes and the legend. 

Answer:

Thank you for your suggestions.

The figures mentioned, including figures 4, 7, and 9, are updated accordingly.

Comment 2: Figures 5 and 6 should probably be better combined to show how the inside diameter affects temperature and pressure.

Answer:

Thank you for your suggestions.

Figures 5 and 6 are combined in the revised manuscript. Also, the temperature contours presented in figures 8 and 10 are revised accordingly.

Comment 3: Table 1 (page 9 line 234) should be corrected to table 2.

Answer:

Thank you for your detailed corrections.

It is our mistake, and the table number is corrected accordingly. 

Author Response File: Author Response.pdf

Reviewer 2 Report

The authors presented a numerical study on the Heat Transfer Performance of a Downhole Electric Tubular Resistive Heater.

The used turbulence model is to be justified.

Why the energy and momentum equations are time-independent, but the transport equation is time-dependent?

 The boundary conditions are to be expressed mathematically.

A figure presenting the used mesh is to be added.

Have you considered a 2D or 3D configuration.

Results related to flow structure are to be added.

Some quantitative findings are to be added to the conclusion.

The main issue of this paper is that very high temperatures are reached without considering the effects of buoyancy force and radiation. To be explained and justified.

 

 

 

Author Response

Manuscript number:  applsci-1898774 

Paper title:  Heat Transfer Performance of a Downhole Electric Tubular Resistive

Heater

Authors:  Yu Chen, Hao Zeng, Jianli Wang, Haoran Chen, Jianjun Zhu

 

Firstly, we gratefully appreciate the reviewers for their helpful comments and suggestions. We have taken your comment seriously and revised our paper thoroughly. The answers to your recommendations are seen in the attachment.

Author Response File: Author Response.pdf

Reviewer 3 Report

Manuscript ID:  applsci-1898774

Title: Heat Transfer Performance of a Downhole Electric Tubular Resistive Heater

The authors proposed a downhole electric resistive heater for the oil shale in-situ resorting. No exact validation is presented for the results. The authors should answer the following major comments before the final decision.

 ·         Variables must be defined right after the formula

·         Present validation test for the result by depicting comparative figures.

·         In Figure 4C, why is the variation trend not regular?

·         Enrich abstract and conclusion sections with more quantitative data from the research.

·         Expand figure captions so figures are almost self-explanatory.

·         Referring to the following paper related to heat transfer improvement in the heat exchangers will be useful to enrich the introduction: 10.1016/j.icheatmasstransfer.2022.106098; 10.1016/j.ultsonch.2018.10.032;

 

·         Writing needs improvement. Also, each section should open with a paragraph or two explaining what to expect.

Author Response

Manuscript number:  applsci-1898774 

Paper title:  Heat Transfer Performance of a Downhole Electric Tubular Resistive

Heater

Authors:  Yu Chen, Hao Zeng, Jianli Wang, Haoran Chen, Jianjun Zhu

 

Firstly, we gratefully appreciate the reviewers for their helpful comments and suggestions. We have taken your comment seriously and revised our paper thoroughly. The answers to your recommendations are seen in the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

After revision, the paper can be accepted for publication.

Reviewer 3 Report

All the comments are adressed.