Modeling of Novel Thermodynamic Cycles to Produce Power and Cooling Simultaneously
and Alejandro Pacheco 1Round 1
Reviewer 1 Report
The manuscript proposes two different cycles based on Goswami cycle by considering two ways of splitting the main flux of the working fluid. In the first one the main flux is splitted previsously to the entrance of the working fluid in the reheater and the turbine, while in the second one, the flux is splitted in the turbine. In both cases a condenser is considered.
The study is performed for different split ratios of the working fluid and provide results of power output, heat power absorbed in the evaporator, energy utilization factor, exergy efficiency and exergy lost.
The paper is well structured and the results are clearly presented, providing valuable results that can serve for the design of systems with different utilities, e.g., producing energy, waste heat recovery, reduction of energy consumption, etc. The results obtained can be used as a guide in order to design different strategies depending of the objetive pursued in every case.
It is also remarkable the efforts made by authors in providing a complete bibliography of the issue, which helps to clarify whcih is the novelty of the work.
These considerations, makes me tor ecommend the publication of this manuscript in Processes in the present form.
Author Response
Dear Reviewer 1.
Thank you very much for your positive comments about the paper.
Reviewer 2 Report
Coments are included in the attached pdf file
Comments for author File: 
Comments.pdf
Author Response
Response to Reviewer No. 2
Dear Reviewer, thank you very much for your comments in order to improve the quality of the paper.
Comment. “Line 151: The novelty….”
Response:
Taking into account your comments two more references were added to the manuscript and the following paragraph was added to the end of the introduction section.
“However, none of the articles presented in the literature reviewed are based on the Goswamy cycle adding only a condenser and an expansion valve to significantly increase the cooling effect by taking advantage of the latent heat of vaporization. Neither was any study found that analyzed the operation of the system based on flow extractions in the turbine at intermediate pressure or after the regenerator to increase the cooling effect. Therefore, in the present study, two novel cycles capable of producing power and cooling simultaneously are presented. The proposed cycles are analyzed and compared to each other and with the Goswami cycle reported in the literature.”
Comments regarding figures 1, 2 and 3.
Response:
Figures 1, 2 and 3 were again elaborated taking care of your comments.
Comment regarding Tables 1, 2 and 3.
Response:
You are right, that was a mistake and the assumption regarding to the isentropic pump was eliminated.
Comment. “Line 257: The different ……”.
Response:
All the subindexes in the text, tables and figures were corrected.
Comment. “Line 261: Figure 3 should be….”.
Response:
The number of the figure was changed.
Comments regarding figure 3 (Algorithm).
Response:
- The word “matter” was eliminated.
- The diagram was modified to include the mass flow rates which are of course necessary for the energy balances. Thanks for the observation.
- The diagram was modified to represent mainly Model III which needs an intermediate pressure which is obtained by fixing the condenser temperature in saturated liquid conditions.
- A reference was included regarding the correlations of the thermodynamic properties used for the ammonia and the ammonia-water mixture.
Comment. “The authors should include ….”.
Response:
Taking into account your comment a table containing all the information for the nominal case was included as an appendix.
Thanks again for all your comments and suggestions.
Author Response File: Author Response.pdf
Reviewer 3 Report
The article describes modeling of the Goswami cycle. The modeling is rather simple and assumes constant effectiveness of certain components. I encourage authors to add more realistic description of the turbine efficiency variation with pressure.
Other remarks
- Please provide comparison of the cycle parameters on working fluid properties graph
- please indicate SR in equations of the model
- figures are of poor quality, please update them, especially the cycle description is hard to understand
Author Response
Response to the Reviewer 3
Dear Reviewer, thank you very much for your comments and suggestions in order to improve the quality of the paper.
Comment. “I encourage authors to add …..”
Response:
Taking into account your comment we carried out more simulations to analyze the behavior of the system exergy efficiency as a function of the turbine efficiency and a new parameter defined as a pressure ratio. The results of the analysis are presented in Figures 17 and 18.
Comment. “Please provide comparison …..”
Response:
We are not sure if we understand your comment because fluid properties such as enthalpies, entropies and some others are not independent variables since they depend on temperatures, pressures, and concentrations. For that reason, we presented some of the graphs as a function of the main system temperatures and thanks to your suggestions we present now the exergy efficiency as a function of the pressure ratio, in figure 14. In case you require more analysis could you clarified a little bit, please?.
Comment. “Please indicate SR…….”
Response:
Taking into account your comment we added the SR equation in Tables 2 and 3.
Comment. “Figures are poor quality…”
Response:
Taking into account your comment, all the figures were again made to improve their quality.
Thanks again for all your comments and suggestions.
Round 2
Reviewer 2 Report
The authors have satisfactorily addressed my comments and have improved the paper notably. So, I consider that the manuscript is now ready for publication.
