Comment on ``first and second law analysis of ammonia/salt absorption refrigeration systems by L. Garousi Farshi et al. [Int. J. refrigeration 40 (2014) 111-121]”

Singh, Dheerendra Vikram; Verma, Tikendra Nath

doi:10.1016/j.ijrefrig.2019.09.018

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“…They found the maximum coefficient of performance from the system at high generator/evaporator but low condenser/absorber temperatures. Singh and Verma 14,15 commented on a research paper that was published by L. Garousi Farshi et al on the first‐ and second‐law analyses of ammonia/salt absorption refrigeration systems. According to them, Garousi Farshi et al used a wrong mathematical expression to predict the thermodynamic properties of working fluids and also validated it wrongly.…”

Section: Introductionmentioning

confidence: 99%

“…They found that the mathematical expression of internal irreversibility is wrong and advised them to correct it. Singh and Verma 14,15 discussed about the published research paper on thermodynamic analyses of ammonia/sodium thiocyanate absorption system, and this paper was published by Linghui Zhu and Junjie Gu. Sarafraz et al 18 used silver‐coconut oil as a nanofluid and analyzed the thermal performance of a HEx.…”

Section: Introductionmentioning

confidence: 99%

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Experimental exergy and entransy analyses on designed and fabricated crossflow heat exchanger

et al. 2020

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A crossflow heat exchanger (CFHEx) is designed and fabricated in a workshop. For designing this heat exchanger (HEx), the number of passes, frontal areas, HEx volumes, heat transfer areas, free‐flow areas, ratios of minimum free‐flow area to frontal area, densities, mass flow rates of flowing fluids, maximum/minimum heat capacities, heat capacity ratio, outlet temperatures of hot/cold fluids, average temperatures, mass velocities, Reynolds numbers, and convective heat transfer coefficients are evaluated by considering Colburn/friction factors. After fabrication of the HEx, effectiveness, exergy destruction, entransy dissipation, entransy dissipation‐based thermal resistance, entransy dissipation number, and entransy effectiveness for hot/cold fluids sides are found at different flow rates and inlet temperatures of fluids. By experimental results, optimum operating conditions are found, which gives maximum effectiveness and entransy effectiveness but minimum rates of exergy destruction, entransy dissipation, entransy dissipation‐based thermal resistance, and entransy dissipation number for the fabricated CFHEx. This study is concluded as follows: minimum exergy destruction and entransy dissipation rates (ie, 3.061 kJ/s·K and 1125.44 kJ·K/s, respectively) are found during experiment 2. Maximum entransy effectiveness of hot/cold fluids (ie, 0.689/0.21) is achieved in experiment 1. Moderate values of entransy dissipation number (ie, 4.689), entransy dissipation‐based thermal resistance (ie, 0.04 s·K/J), exergy destruction (ie, 3.845 kJ/s·K), and entransy dissipation (ie, 1374.04 kJ·K/s) rates are found during experiment 1. Maximum effectiveness (ie, 0.4) for the fabricated HEx is also obtained through experiment 1. After comparative analyses, it is found that experiment 1 provides optimum results, which shows the best performance of the fabricated HEx.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%