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Heat and Mass Transfer

, Volume 54, Issue 3, pp 867–873 | Cite as

Thermal performances of a “black box” heat exchanger in district heating system

  • Srbislav B. Genić
  • Branislav M. Jaćimović
  • Uroš M. Milovančević
  • Miloš M. Ivošević
  • Milena M. Otović
  • Milan I. Antić
Original
  • 113 Downloads

Abstract

The procedure for field testing of plate heat exchanger, considered as a black box, is presented in the paper. After the field measurements have been conducted, simple but unambiguous procedure has been used to establish heat performance parameters including the heat duty and fouling factor. Advantage of hereby presented method is that it can be used for analysis of any other similar heat transfer equipment.

Nomenclature

a, A, b, B, c

parameters

cp

specific heat capacities of fluid, [Jkg−1 K−1]

dh

hydraulic diameter, [m]

k

overall heat transfer coefficient, [Wm−1 K−1]

m

mass flow rate, [kgs−1]

NTU

number of transfer units, [−]

Nu

Nusselt number, [−]

P

heat effectiveness parameter, [−]

Pr

Prandtl number, [−]

Q

heat duty, [W]

R

fouling factor, [m2KW−1]

R

ratio of heat equivalents, [−]

Re

Reynolds number, [−]

Rtot

total fouling factor, [m2KW−1]

SHE

heat exchanger surface area, [m2]

sQ

deviation of heat duty, [W]

t

temperature, [°C]

W

channel width, [m]

w

velocity, [ms−1]

Greek symbols

α

heat transfer coefficient, [Wm−2 K−1]

δ

distance between plates, [m]

δpl

plate thickness, [m]

ΔsQ

dispersion of heat duty, [−]

Δtav

mean logarithmic temperature difference, [°C]

λ

thermal conductivity of fluid, [Wm−1 K−1)]

λpl

thermal conductivity of plate, [Wm−1 K−1)]

μ

dynamic viscosity, [kg/(m·s)]

ρ

density, [kgm−3]

Indexes

1

hot fluid

2

cold fluid

c

correlated

in

inlet

m

measured value

nom

nominal

out

outlet

Notes

Acknowledgments

The research work is funded by Ministry of Education, Science and Technological Development of Republic of Serbia.

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Faculty of Mechanical EngineeringUniversity of BelgradeBelgradeSerbia

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