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Enhancing the thermal performance of diffusion absorption refrigeration system by using magnesium aluminate spinel oxide compound nanoparticles: an experimental investigation

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Abstract

This article aims to enhance the efficiency of Diffusion Absorption Refrigeration (DAR) systems which operate at low efficiency. This study experimentally investigates the effect of passive heat transfer enhancement by using various nanofluids as working fluids including ammonia/water couple with different rates of magnesium oxide aluminate spinel (MgOAl2O3) particles. The tests have been carried at the same ambient conditions to obtain reliable results. Additionally, nanofluid has been prepared and tested in two different particle concentration (1% and 2%). Adding nanoparticles to the base fluid (25% ammonia/water) can make an important positive effect in increasing heat transfer by extending surface area and heat capacity of the fluid. Experimental results showed that using nanofluid as working fluid in DAR system results in faster evaporation which decreases operation time and increases heat transfer in generator. Moreover, the DAR system containing 2% concentration of nanofluid solution led to a 37.4% increase in performance coefficient (COP) and a 44.2% increase in exergetic performance coefficient (ECOP) compared to the DAR system without nano particles.

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Abbreviations

Cp :

specific heat capacity (J kg−1 K−1)

h :

specific enthalpy (kJ kg−1)

\( \dot{m} \) :

mass flow rate (kgs−1)

p:

pressure (bar)

q h :

power of generator (W)

q rf :

heat transported from rectifier (W)

\( \dot{\mathrm{Q}} \) :

heat exchanged (W)

T:

temperature (°C)

WR :

total uncertainty (%)

w1, w2, wn :

uncertainties in the independent variables

x :

mass fraction of the solution (−)

\( \mathsf{evap} \) :

Evaporator

\( \mathsf{h} \) :

Heater

\( \mathrm{g}-\mathrm{v} \) :

generator-vapor

g − w:

generator-water (water by weak solution)

\( \mathsf{o} \) :

ambient

\( \mathsf{rf} \) :

Rectifier

rf − w:

rectifier-water (water by solution)

\( \mathsf{rf}-\mathsf{v} \) :

rectifier-vapor

1, 2, 4a…:

system’s point designation.

\( \mathsf{CFCs} \) :

Chlorofluorocarbons

COP:

Coefficient of Performance

DAR:

Diffusion Absorption Refrigeration

\( \mathsf{DMAC} \) :

Dimethylacetamide

ECOP:

Exergetic Coefficient of Performance

HCFCs:

Hydro Chloro Fluoro Carbons

\( \mathsf{He} \) :

Helium

MgOAl2O3 :

Magnesium oxide aluminate spinel

SDBS:

Sodium Dodecyl Benzene Sulfonate

SHE:

Solution Heat Exchanger

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Authors and Affiliations

  1. Energy Systems Engineering, Gazi University, Ankara, Turkey

    Adnan Sözen

  2. Energy Systems Engineering, Muğla Sıtkı Koçman University, Muğla, Turkey

    Ali Keçebaş & Emine Yağız Gürbüz

  3. Natural and Applied Science Institute, Gazi University, Ankara, Turkey

    Emine Yağız Gürbüz

Authors
  1. Adnan Sözen
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  2. Ali Keçebaş
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  3. Emine Yağız Gürbüz
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Correspondence to Emine Yağız Gürbüz.

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Sözen, A., Keçebaş, A. & Gürbüz, E.Y. Enhancing the thermal performance of diffusion absorption refrigeration system by using magnesium aluminate spinel oxide compound nanoparticles: an experimental investigation. Heat Mass Transfer 57, 1583–1592 (2021). https://doi.org/10.1007/s00231-021-03046-5

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