Dairy Processing - September/October 2023 - 66

EQUIPMENT
The right
P
FIT
Scraped surface heat exchangers can provide flexibility and speed.
by Michael Gordon | dairyprocessing@sosland.com
roducing any type of food or beverage product likely
involves heat treatment, which means the use of heat
exchangers. Choosing the right heat exchanger, however,
is highly dependent on the characteristics of the product - from
its viscosity to the size of the particles. By matching the choice
of technology to a specific application, it's possible to achieve
reliable and efficient heat transfer, which in turn ensures
consistent product quality and helps to improve the overall
efficiency of an operation.
Optimizing heat treatment to fit a product application is
critical for ensuring food safety and quality - as well as for costeffective
and sustainable processing.
Reciprocal heat exchangers are suitable for viscous products
which require gentle handling, while rotating is more suitable
for products which benefit from vigorous handling or mixing.
The type of heat exchanger will also be influenced by the
rise of fall in temperature required and the heating or cooling
medium employed.
While tubular heat exchangers are useful for many dairy
product applications, some more challenging processes - such
as pasteurizing or cooling thick, viscous, sticky or particulate
products - require a more robust solution, such as scraped
surface heat exchangers.
Scraped surface heat exchangers (SSHEs) typically consist
of two key components within the tube: the scrapers and a
scraper bar.
First, the scrapers work to constantly remove product from
the tube surface to prevent the build-up of a fouling layer, which
would otherwise reduce heat transfer.
Second, the scraper provides a mixing action within the
product as it passes through the heat exchanger, ensuring that
heating or cooling occurs evenly within the product. Many
designs actually help push the product through the tube,
ensuring even flow and heat transfer.
OTHER CONSIDERATIONS
Because of the increased resistance within the tube, SSHEs
can create much higher pressure drops than open tube heat
exchangers. A higher-pressure drop means more pressure and
energy is required to operate the equipment, and in some cases
the higher pressure can create a shearing force which physically
splits or damages the product.
66 SEP-OCT 2023 | DAIRYPROCESSING.COM
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Dairy Processing - September/October 2023

Table of Contents for the Digital Edition of Dairy Processing - September/October 2023

Dairy Processing - September/October 2023 - Intro
Dairy Processing - September/October 2023 - 1
Dairy Processing - September/October 2023 - 2
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