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longzai铜虫 (小有名气)
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Reviewers' comments: Reviewer #1: Page 3 lines 15: Please show a comparison of the COP between ejector-absorption or expander-absorption cycle and the novel proposed cycle. Because the cycle aims at getting a higher COP as the authors mentioned. Can the cycle get a higher COP than these combined ejector-absorption or expander-absorption cycles? This point is significant. However, the authors are compared the COP of the novel cycle among simple cycles those are a conventional single effect cycle and a conventional two stage cycle in the section 4. This is a kind of practice calculation. It is not enough to say the useful results. Why doesn't the authors compare the novel cycle with an advanced cycle? Cycle description: In order to understand the cycle can be driven with thermo dynamically, please describe the novel cycle with pointing out the state number among their elements on T-s diagram and P-T diagram. Reviewer #2: The authors have proposed a novel absorption refrigeration cycle with an expander-compressor in order to improve the performance of a conventional ammonia-water based absorption refrigeration cycle. The performance of the proposed system is compared to that of both single and two stage absorption refrigeration cycles. The work is interesting. However, this reviewer suggests suggest the acceptance of the paper provided that the authors made the amendments (Required Amendments) as suggested below. Strength of the paper 1. The innovation of this paper is the coupling of expander- compressor which results in the improvement in performance. 2. The proposed system can be powered by low grade heat sources. Main weakness of the paper 1. The mathematical modeling of this paper is only based on first law of thermodynamics and it is too simple. Moreover, it can be found in any related text book. 2. Overall efficiency of the expander-compressor of 0.8 and 1, which is difficult to attain in reality. 3. Maximum COP of the present system is about 0.105 (as shown in Fig. 2) which is very low. Required Amendments 1. More details of the modeling should be introduced from the rigor of classical thermodynamics. 2. In Figure 3, the plot of COP versus evaporation temperature should be in the range of -10oC to 20oC so that the reader can see the advantage of the proposed cycle clearly. 3. The reference section is incomplete. Should cite the following papers among other relevant papers: (a) M. Hultén, T. Berntsson, The compression/absorption cycle - influence of some major parameters on COP and a comparison with the compression cycle, International Journal of Refrigeration, Volume 22, No. 2, pp. 91-106, 1999. (b) R. Ayala et al., Ammonia/Lithium nitrate absorption/compression refrigeration cycle. Part II. Experimental, Applied Thermal Engineering, Volume 18, No. 8, pp. 661-670, 1998 (c) L. Åhlby, NH3/H2O---LiBr as working fluid for the compression/absorption cycle, International Journal of Refrigeration, Volume 16, No. 4, pp. 265-273, 1993, (d) H.Y. Kim et al., Development of a slug flow absorber working with ammonia-water mixture: Part 1. Flow characterization and experimental investigation, International Journal of Refrigeration, Vol. 26, No. 5, pp. 508-515, 2003. (e) H.Y. Kim et al., Development of a slug flow absorber working with ammonia-water mixture: Part 2. Data reduction model for local heat and mass transfer characterization, International Journal of Refrigeration, Vol. 26, No. 6, pp. 698-706, 2003. 4. Reference 6 of the present version is incomplete. 5. English language should be improved. 6. Should require clear statement about the advantage of the proposed system over other conventional system. ------------------------------------------------------------------ 编辑的意思是大修，第一个审稿人可能对我做的东西不是很明白，提的问题不是很对路，不知道是不是没有仔细看还是真的不懂。决定跟他进行比较礼貌的说明。 第二个审稿人应该是内行。 不知道这样的情况是好事坏？投的第一篇国外的杂志。 [ Last edited by longzai on 2010-1-5 at 18:56 ] |
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longzai
铜虫 (小有名气)
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longzai
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longzai
铜虫 (小有名气)
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6楼2010-01-05 19:38:56