Ammonia lithium nitrate and ammonia sodium thiocyanate double effect absorption refrigeration systems: Thermodynamic analysis

•Double effect absorption refrigeration systems are studied.•Ammonia lithium nitrate and ammonia sodium thiocyanate are used as working fluid.•Linear equation for specific heat of solution are obtained from correlating the experimental data.•The COP of double effect systems are maximum 60% more than...

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Bibliographic Details
Published in:Applied thermal engineering 2018-06, Vol.138, p.374-385
Main Authors: Garousi Farshi, L., Asadi, S.
Format: Article
Language:English
Subjects:
Absorption
Ammonia
Ammonia lithium nitrate
Ammonia sodium thiocyanate
Configuration management
Crystallization
Double effect absorption refrigeration
Efficiency
Enthalpy
Error analysis
Exergy
Linear equations
Lithium
Nitrates
Parameters
Refrigeration
Sodium thiocyanate
Thermodynamic analysis
Thermodynamics
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Summary:•Double effect absorption refrigeration systems are studied.•Ammonia lithium nitrate and ammonia sodium thiocyanate are used as working fluid.•Linear equation for specific heat of solution are obtained from correlating the experimental data.•The COP of double effect systems are maximum 60% more than that for single effect systems.•The exergetic efficiency is maximum 16% less than that for single effect cycles. This paper presents a comparison of the performance for three configurations of double effect absorption refrigeration systems with single effect one using ammonia lithium nitrate (NH3/LiNO3) and ammonia sodium thiocyanate (NH3/NaSCN) as working solutions. The effect of operating parameters on COP and exergetic efficiency of the cycles is investigated. In order to avoid error in estimation of solutions enthalpy and entropy at high temperatures, linear equations for specific heat of solutions are obtained from correlating the experimental data. Furthermore, the effects of operating parameters on crystallization possibility are studied. The COP of double effect systems are maximum 60% more, but exergetic efficiency is maximum 16% less than those for single effect cycles. The NH3/LiNO3 systems compared to the NH3/NaSCN systems can perform at lower generator temperatures with higher COP and exergetic efficiency. Operating range of NH3/LiNO3 system is wider, since it is limited for NH3/NaSCN cycle because of crystallization occurrence.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2018.04.079