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Exergy destruction analysis of a vortices generator in a gas liquid finned tube heat exchanger: an experimental study

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Abstract

In the present work, the effect of using different shapes of vortices generator (VG) on a gas liquid finned heat exchanger is investigated experimentally with irreversibility analysis. In this project the ambient air with mass flow rates of 0.047–0.072 kg/s is forced across the finned tube heat exchanger. Hot water with constant flow rate of 240 L/h is circulated inside heat exchanger tubes with inlet temperature range of 45–73 °C. The tests are carried out on the flat finned heat exchanger and then repeated on the VG finned heat exchanger. The results show that using the vortex generator can decrease the ratio of air side irreversibility to heat transfer (ASIHR) of the heat exchanger. Also the results show that the IASIHR is >1.05 for all air mass flow rates, which means that ASIHR for the initial heat exchanger is higher than 5 % greater than that of improved heat exchanger.

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Abbreviations

ASIHR:

Irreversibility to heat transfer ratio of air side

c :

Specific heat of water (J/kg K)

c p :

Specific heat of air at constant pressure (J/kg K)

\( \dot{E} \) :

Exergy transfer rate (W)

h :

Enthalpy (J/kg)

(h 2 − h 3):

Air side pressure drop (mm w.g.)

IASIHR:

Improved irreversibility to heat transfer ratio of air side

\( \dot{I} \) :

Irreversibility rate (W)

\( \dot{m} \) :

Mass flow rate (kg/s)

\( \dot{Q} \) :

Heat transfer rate (W)

R :

Gas constant (J/kg K)

s :

Entropy (J/kg K)

T :

Temperature (K)

VG:

Vortices generator

\( \Delta \dot{E} \) :

Change of exergy transfer rate (W)

ΔP :

Pressure drop (Pa)

ΔT :

Temperature difference (K)

Δφ :

Change of specific flow exergy (J/kg)

ɛ exergy :

Exergy transfer effectiveness (%)

ɛ HE :

Heat exchanger effectiveness (%)

ν :

Specific volume of water (m3/kg)

φ :

Specific flow exergy (J/kg)

a:

Air

AS:

Air side

HE:

Heat exchanger

i:

Inlet

max:

Maximum possible

o:

Outlet

w:

Water

with VG:

Heat exchanger with mounted VGs on its fin surfaces

without VG:

Flat finned tube heat exchanger

0:

The surrounding state

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Authors and Affiliations

  1. Faculty of Mechanical and Energy Engineering, Shahid Beheshti University, A.C., Tehran, Iran

    I. Khazaee

  2. Mechanical Engineering Department, Engineering Faculty, Ferdowsi University of Mashhad, P.O. Box 9177948944-1111, Mashhad, Iran

    M. Ghazikhani, S. M. S. Monazzam & H. Takdehghan

Authors
  1. M. Ghazikhani
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  2. I. Khazaee
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  3. S. M. S. Monazzam
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  4. H. Takdehghan
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Correspondence to I. Khazaee.

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Ghazikhani, M., Khazaee, I., Monazzam, S.M.S. et al. Exergy destruction analysis of a vortices generator in a gas liquid finned tube heat exchanger: an experimental study. Heat Mass Transfer 52, 2531–2539 (2016). https://doi.org/10.1007/s00231-016-1762-0

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  • DOI: https://doi.org/10.1007/s00231-016-1762-0

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