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Journal of Thermal Analysis and Calorimetry

, Volume 122, Issue 2, pp 893–905 | Cite as

Thermodynamic optimization and chemical exergy quantification for absorption-based refrigeration system

  • A. Gupta
  • Y. Anand
  • S. Anand
  • S. K. Tyagi
Article

Abstract

The present article suggests a thermodynamic analysis of flat-plate collector-based single-effect ammonia–water vapor absorption refrigeration system. The investigation involves the development of numerical and computational model based on physical and chemical exergies for the analysis of single-effect absorption systems. The investigation revealed that various operating parameters influence COP, exergy loss in different components as well as exergy efficiency. The COPcooling, COPheating and exergy efficiency show a decreasing trend with an increase in the generator temperature (60–100 °C) and lie in the range of 0.398–0.435, 1.39–1.43 and 0.1421–0.2975, respectively. The COPcooling and COPheating show an increasing trend with an increase in the evaporator temperature, whereas exergy efficiency shows a decreasing trend with an increase in the evaporator temperature. However, The COPcooling, COPheating and exergy efficiency show a decreasing trend with an increase in absorber and condenser temperature. The variation in physical \( (\varPsi_{\text{loss}}^{\text{PH}} ) \) and chemical exergy losses \( (\varPsi_{\text{loss}}^{\text{CH}} ) \) with ambient temperature has also been discussed in the analysis. It is noticed that the highest percentage of non-dimensional physical and chemical exergy losses are found to be in the generator. The second worst component from the non-dimensional physical and chemical irreversibility viewpoints is the absorber, followed by solution heat exchanger, evaporator and condenser.

Keywords

Absorption refrigeration system Coefficient of performance Exergy analysis Exergetic efficiency Physical and chemical exergies 

Abbreviations

EES

Engineering Equation Solver

FPC

Flat-plate collector

List of symbols

COP

Coefficient of performance

\( \dot{m} \)

Mass flow rate of refrigerant (kg s−1)

h

Enthalpy (kJ kg−1)

s

Entropy (kJ kg−1 K−1)

\( \dot{Q} \)

Heat flow (kJ s−1)

p

Pressure (bar)

T

Temperature (K)

\( \dot{W} \)

Power consumption (kJ s−1)

\( \psi \)

Exergy (kJ s−1)

1–10

Different state points in a system

PR valve

Pressure-reducing valve

Greek symbols

ε

Effectiveness of heat exchanger

η

Efficiency

Subscripts

G

Generator

E

Evaporator

A

Absorber

C

Condenser

P

Pump

SHE

Solution heat exchanger

Loss

Loss

i, in

Inside

o, out

Ambient, outside, reference

ND

Non-dimensional

ref

Refrigerant

abs

Absorbent

Superscripts

PH

Physical

CH

Chemical

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2015

Authors and Affiliations

  1. 1.School of Energy ManagementShri Mata Vaishno Devi UniversityKatraIndia
  2. 2.Sardar Swaran Singh National Institute of Renewable EnergyKapurthalaIndia

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