Application of inductive forced heating as a new approach to food industry heat exchangers

A case study—Tomato paste pasteurization
Article

Abstract

Heat exchangers are one of the main equipment used in food industry because of their convenience to transfer energy to both auxiliary facilities and various food products. In food industry, there are several reasons for heat transfer such as pre-heating, pasteurizing and sterilizing in which heat exchangers require high amount of energy. On the other hand, as being a unique quality assurance unit heat exchangers should be cleaned easily and extensively. Having high operating costs due to energy consumption and requiring high investment cost due to ensure a reliable hygienic design make heat transfer units an expensive and energy-consuming unit. Therefore, developing new approaches to generate energy and transferring it hygienically with minimum loses will be an opportunity for the food industry. With the view of developing new equipment for industry, induction-driven heating system was investigated in this study and energy and exergy efficiencies were calculated and compared with conventional heat exchanger system. Selected food system was the tomato paste sterilization/pasteurization which is a part of tomato paste production line. After assumptions and theoretical calculations for both conventional application and inductive heating, it was found that inductive heating system has 95.00% energy efficiency and 46.56% second law efficiency while the conventional heating system with electric boiler has 75.43% energy efficiency and 16.63% exergy efficiency. As a consequence, inductive method was found more beneficial compared to a commercial method having higher energy and exergy efficiencies.

Keywords

Heat exchangers Food industry Efficiency Exergy analysis Induction heating 

List of symbols

\(\dot{E}\)

Energy rate (kW)

\(\dot{E}x\)

Exergy rate (kW)

\(h\)

Specific enthalpy (kJ kg−1)

\(\dot{m}\)

Mass flow rate (kg s−1)

\(P\)

Pressure (MPa)

\(s\)

Specific entropy (kJ kg−1 K−1)

\(\dot{S}\)

Entropy rate (kW K−1)

\(\dot{Q}\)

Heat transfer rate (kW)

V

Velocity (ms−2)

g

Gravitational acceleration (ms−2)

z

Elevation (m)

\(T\)

Temperature (K)

\(\dot{W}\)

Work rate power (kW)

\(\dot{I}\)

Irreversibility (kW)

Greek letters

\(\eta\)

Energy or first law efficiency (%)

\(\psi\)

Flow exergy (kJ kg−1)

\(\varepsilon\)

Exergy or second law efficiency (%)

Subscripts

CV

Control volume

dest

Destroyed, destruction

0

Restricted dead state

gen

Generation

in

Inlet

out

Outlet

b

Boundary

wf

Working fluid

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Engineering FacultyManisa Celal Bayar UniversityManisaTurkey
  2. 2.Department of Food Engineering, Engineering FacultyManisa Celal Bayar UniversityManisaTurkey

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