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The performance assessment of a refrigeration system which exists on a cargo vessel influenced by seawater-intake temperature

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Abstract

The effects of the seawater-intake temperature on the performance of the refrigeration system which exists on a cargo vessel were introduced in this study. The performance of the real refrigeration system was analysed by using both conventional and advanced exergy analyses and exergoeconomic evaluation. First, a parametric study with different seawater-intake temperatures was carried out by applying conventional exergy and advanced exergy analyses to the refrigeration system considered to identify the pinch point components and processes with high irreversibilities. Then, advanced exergy analyses were applied to overcome technological and physical limitations to increase the knowledge about the refrigeration system. The exergetic efficiency of the refrigeration system was calculated based on varying seawater-intake temperature which enters the condenser while other operating parameters are kept constant. Seawater-intake temperatures were selected in terms of regional seawater temperatures which are assumed to be in the vessel route. As a result of the study, it was determined that the hot entry of the seawater into the condenser causes a reduction in the exergetic efficiency of the refrigeration system. The gap between real system exergetic efficiency and the unavoidable cycle exergetic efficiency increased as the pinch point temperature differences increased in the condenser by approximately 16%. Some of the exergy destruction in the refrigeration system components was unavoidable and constrained by technological and physical limitations. Based on the findings in this study, it has been shown that the greatest improvement in the exergetic efficiency of the cooling system can be achieved by improving the condenser and compressor.

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Abbreviations

\(\dot{E}\) :

Exergy (kW)

e :

Specific exergy (kJkg−1)

h :

Enthalpy (kJkg−1)

\(\dot{m}\) :

Mass flow rate (kgs-1)

\(\dot{Q}\) :

Heat (W)

P :

Pressure (kPa)

s:

Entropy (kJkg−1K−1)

T :

Temperature (K)

\(\dot{W}\) :

Power (kW)

ΔP :

Pressure drop (kPa)

ΔT :

Temperature differences (K)

ε:

Exergy efficiency (%)

y :

Exergy destruction ratio (%)

x :

Quality ratio (%)

AV:

Avoidable

CD:

Condenser

CM:

Compressor

D:

Destruction

EN:

Endogenous

EV:

Evaporator

EX:

Exogenous

F:

Fuel

in:

Inlet

k:

Component

L:

Loss, liquid

LT:

Low temperature

M:

Mechanic

mex:

Mexogenous

MT:

Medium temperature

0:

Dead state

Out:

Outlet

P:

Product

R:

Real

T:

Thermal

Th:

Theory

Tot:

Total

TV:

Throttling valve

UN:

Unavoidable

V:

Vapour

W:

Water

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Acknowledgements

The authors would like to thank Prof. Dr. Teoman AYHAN for his valuable comments, which have been utilized in improving the quality of the paper. Also, the authors would like to thank NCCB NAVIGATION S.A. Company for the technical data to the present research.

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Authors and Affiliations

  1. Programme of Marine Engineering, Ordu University, Ordu, 52400, Turkey

    Cihan Nacak

  2. Department of Naval Architecture and Marine Engineering, Karadeniz Technical University, Trabzon, 61530, Turkey

    Betül Saraç

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  1. Cihan Nacak
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Correspondence to Betül Saraç.

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Nacak, C., Saraç, B. The performance assessment of a refrigeration system which exists on a cargo vessel influenced by seawater-intake temperature. J Therm Anal Calorim 146, 1229–1243 (2021). https://doi.org/10.1007/s10973-020-10060-y

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