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Comprehensive performance analysis and optimization of 1,3-dimethylimidazolylium dimethylphosphate-water binary mixture for a single effect absorption refrigeration system

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Abstract

The energy and exergy analyses of the absorption refrigeration system (ARS) using H2O-[mmim][DMP] mixture were investigated for a wide range of temperature. The equilibrium Dühring (P-T-XIL) and enthalpy (h-T-XIL) of mixture were assessed using the excess Gibbs free non-random two liquid (NRTL) model for a temperature range ??? of 20°C to 140°C and XIL from 0.1 to 0.9. The performance validation of the ARS cycle showed a better coefficient of performance (COP) of 0.834 for H2O-[mmim][DMP] in comparison to NH3-H2O, H2O-LiBr, H2O-[emim][DMP], and H2O-[emim][BF4]. Further, ARS performances with various operating temperatures of the absorber (Ta), condenser (Tc), generator (Tg), and evaporator (Te) were simulated and optimized for a maximum COP and exergetic COP (ECOP). The effects of Tg from 50°C to 150°C and Ta and Tc from 30°C to 50°C on COP and ECOP, the Xa, Xg, and circulation ratio (CR) of the ARS were evaluated and optimized for Te from 5°C to 15°C. The optimization revealed that Tg needed to achieve a maximum COP which was more than that for a maximum ECOP. Therefore, this investigation provides criteria to select low grade heat source temperature. Most of the series flow of the cases of cooling water from the condenser to the absorber was found to be better than the absorber to the condenser.

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Abbreviations

τ :

NRTL parameter

γ 1 :

Activity coefficient of water

α :

Temperature independent NRTL model parameter

C p :

Specific heat capacity at constant pressure /(kJ·(kg·K)−1)

g :

Gibbs energy

h :

Enthalpy/(kJ·kg−1)

m :

Mass flow rate/(kg·s−1)

p 1 :

Partial pressure of H2O/kPa

P :

Total vapor pressure/kPa

\(P_1^{{\rm{sat}}}\) :

Saturation pressure of H2O

Q :

Heat load/kW

R :

Gas constant/(kJ·(kmol·K)−1)

T :

Temperature/°C

X IL :

Mass fraction of IL into a binary mixture

x 1 :

Mole fraction of H2O into a binary mixture

1,2,3:

State points

a:

Absorber

c:

Condenser

E:

Excess

e:

Evaporator

g:

Generator

max:

Maximum

ARS:

Absorption refrigeration and cooling system

ARD:

Average relative deviation

COP:

Energetic coefficient of performance

CR:

Mixture circulation ratio

ECOP:

Exergetic coefficient of performance

LiBr:

Lithium bromide

[mmim][DMP]:

1,3-dimethylimidazolylium dimethylphosphate

[emim][DMP]:

1-ethyl-3-methylimidazolium dimethyl phosphate

[emim][BF4]:

1-ethyl-3-methylimidazolium tetrafluoroborate

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Acknowledgements

This work was jointly supported by Qatar University International Research Collaboration Co Fund (Grant No. IRCC-2019-012).

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Authors and Affiliations

  1. Collage of Engineering, Qatar University, Doha, 2713, Qatar

    Gorakshnath Takalkar & Ahmad K. Sleiti

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  1. Gorakshnath Takalkar
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Correspondence to Gorakshnath Takalkar or Ahmad K. Sleiti.

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Takalkar, G., Sleiti, A.K. Comprehensive performance analysis and optimization of 1,3-dimethylimidazolylium dimethylphosphate-water binary mixture for a single effect absorption refrigeration system. Front. Energy 16, 521–535 (2022). https://doi.org/10.1007/s11708-021-0720-9

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  • DOI: https://doi.org/10.1007/s11708-021-0720-9

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