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Experimental performance investigation of a shell and tube heat exchanger by exergy based sensitivity analysis

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Abstract

Heat exchangers are used extensively in many industrial branches, primarily so in chemical and energy sectors. They also have important household usage as they are used in central and local heating systems. Any betterment on heat exchangers will serve greatly in preserving our already dwindling and costly energy resources. Strong approach of exergy analysis -which helps find out where the first steps should be taken in determining sources of inefficiencies and how to remedy them- will be used as a means to this end. The maximum useful work that can be harnessed from systems relationships with its environment is defined as exergy. In this study, the inlet and outlet flow rate values of fluids and temperature of hot stream both on shell and tube parts of a shell-tube heat exchange system have been inspected and their effects on the exergy efficiency of this thermal system have been analyzed. It is seen that the combination of high tube side inlet temperature, low shell side flow rate and high tube side flow rate are found to be the optimum for this experimental system with reaching 75, 65, and 32 % efficiencies respectively. Selecting operating conditions suitable to this behavior will help to increase the overall efficiency of shell-tube heat exchange systems and cause an increment in energy conservation.

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Abbreviations

Ex:

Exergy (kW)

G:

Gibbs free energy (kJ/kg)

H:

Enthalpy (kJ/kg)

S:

Entropy (kJ/kg K)

T:

Temperature (K, °C)

P:

Pressure (bar, atm)

c:

Specific heat (kJ/kg K)

v m :

Volume (L, m3)

x :

Composition (−)

ν :

Stoichiometric constant (−)

Q :

Heat (kW)

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Authors and Affiliations

  1. Department of Chemical Engineering, Yuzuncu Yıl University, 65080, Van, Turkey

    Suha Orçun Mert & Alper Reis

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  1. Suha Orçun Mert
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  2. Alper Reis
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Correspondence to Suha Orçun Mert.

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Mert, S.O., Reis, A. Experimental performance investigation of a shell and tube heat exchanger by exergy based sensitivity analysis. Heat Mass Transfer 52, 1117–1123 (2016). https://doi.org/10.1007/s00231-015-1636-x

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