Exergy analysis of single effect absorption refrigeration systems: The heat exchange aspect

Joybari, Mahmood Mastani; Haghighat, Fariborz

doi:10.1016/j.enconman.2016.08.029

Cited by 32 publications

(2 citation statements)

References 34 publications

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“…Exergy efficiency is another important indicator to the performance of heat exchanger, which reveals the quality of the usable energy transfer [33][34][35]. Since the working temperature of fluids in the evaporator is below the environmental temperature (assumed to be 293 K), cold exergy is transferred from the cold fluid to the two hot fluids.…”

Section: Basic Equations Based On Segment Design Methodsmentioning

confidence: 99%

Theoretical analysis for heat exchange performance of transcritical nitrogen evaporator used for liquid air energy storage

Song

Al‐Duri

et al. 2018

Applied Thermal Engineering

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In view of violent changes of thermo-physical properties, the segmental design method is adopted to explore the heat exchange performances of the transcritical nitrogen (T-N 2) evaporator used for liquid air energy storage, in which cold N 2 is heated up successively by hot propane and methanol in two wide temperature sections. The local heat capacity rate ratio between cold and hot fluids has crucial effects on the local heat exchange performance of evaporator, such as local effectiveness, local entransy dissipation, and local required heat conductance or local heat transfer rate. They have extremums near the positions where the local heat capacity rate ratio equals one, but their optimal values need to be determined by combining the changing trend of the local heat capacity rate ratio. The total heat exchange performance of evaporator is evaluated using total entransy dissipation and total exergy efficiency. When the heat load is fixed, the total performance is improved with the decrease in the mass flow rate of methanol, but at the expense of the required total heat conductance; The total performance can be optimized by precisely tailoring the heat load ratios between the two temperature sections. When the heat conductance is given, the optimum total performance can be obtained by adjusting the mass flow rate of hot fluids at a fixed heat conductance ratio; Increasing the heat conductance ratio of the low temperature section can further elevate the optimum total performance whereas the affordable heat load or the outlet temperature of N 2 is notably decreased. Increasing N 2 pressure elevates the total performance of evaporator but diminishes the extractable cold amount from the liquid N 2 in the same temperature rise. This work is beneficial for selection of key parameters to achieve optimal operation of the T-N 2 evaporator.

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Section: Basic Equations Based On Segment Design Methodsmentioning

confidence: 99%

Theoretical analysis for heat exchange performance of transcritical nitrogen evaporator used for liquid air energy storage

Song

Al‐Duri

et al. 2018

Applied Thermal Engineering

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“…Exergy analysis is also applied to identify the unit with the highest percent of exergy destruction in refrigeration systems [26]. Joybari and Haghighat [27] suggested the cooling tower of single effect absorption refrigeration systems should be modified with lower cooling water mass flow rate and higher cooling water temperature according to the exergy analysis results. Wu et al [28] performed exergy and economic analysis to illustrate the system performance of proposed hybrid source heat pump system.…”

Section: Literature Reviewmentioning

confidence: 99%

Exergy analysis and multi-objective optimisation for energy system: a case study of a separation process in ethylene manufacturing

Shen

Wang

Huang

et al. 2021

Journal of Industrial and Engineering Chemistry

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In chemical industry, most processes face the challenge of high energy consumption.The approach presented in this study can reduce the energy footprint and increase efficiency. The energy system of a separation process in ethylene manufacturing is used to demonstrate the effectiveness of the approach. The chilling train system of the separation process in a typical ethylene plant consumes most cooling and provides appropriate feed for distillation columns. The steady state simulation of system was presented and the simulation results were proved accurate. The conventional exergy analysis identifies that Dephlegmator No.1 (a heat exchange and mass transfer device) has the highest exergy destruction (1401.28 kW). Based on advanced exergy analysis, Dephlegmator No.1 has the highest rate of avoidable exergy destruction (89.04 %). Finally, a multiobjective optimisation aiming to maximise system exergy efficiency and to minimise operational cost was performed and the Pareto frontier was obtained. The optimized exergy efficiency is 79.53 % (improved by 0.61 %) and the operational cost is 0.02031 yuan/kg (saved by 11.19 %). This study will guide future research to reduce energy consumption in process manufacturing.

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Comparative Exergetic Analysis of Vapour Absorption Refrigeration System Using Three Different Absorbent Refrigerant Fluids: LiBr–H2O, LiCl–H2O, and NH3–H2O

Kumar,

Ambikesh

2024

Lecture Notes in Mechanical Engineering

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Exergy analysis of single effect absorption refrigeration systems: The heat exchange aspect

Cited by 32 publications

References 34 publications

Theoretical analysis for heat exchange performance of transcritical nitrogen evaporator used for liquid air energy storage

Theoretical analysis for heat exchange performance of transcritical nitrogen evaporator used for liquid air energy storage

Exergy analysis and multi-objective optimisation for energy system: a case study of a separation process in ethylene manufacturing

Comparative Exergetic Analysis of Vapour Absorption Refrigeration System Using Three Different Absorbent Refrigerant Fluids: LiBr–H2O, LiCl–H2O, and NH3–H2O

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