Increase the pressure with annular space heat exchangers Annular space heat exchangers, such
treatment (sometimes as many as 20 or
as the HRS AS Series, work by passing
30 elements), the product needs to be
the product through the gap between
pumped at considerable pressure. The
the inner and outer tubes (the annular
physical properties of such fruit purees
space), which makes them suitable for
mean that this high-pressure handling
thick, highly viscous products such as
does not adversely affect the quality of
fruit purees, thick sauces, honey and
the product.
syrups. For such applications, HRS offers The advantage of such a design is
a high-pressure version of the AS
that it ensures even heating or cooling
Series. This includes thicker tube walls
of the product, while the use of HRS
around the product, while the service
corrugated tube technology increases
fluid (usually water or steam) remains
heat transfer and energy efficiency, as
be achieved as standard on the product
at standard pressures of around 10
well as reducing product fouling on the
side, but for some applications even
bar. The design means that process
tube surfaces.
higher pressures are required.
pressures of up to 150 bar can be
HRS produces both a three- and
One common example is the
of the heat exchanger, making it ideal
four-tube version of the AS Series (the
sterilisation of tomato puree using
for applications such as pasteurising
AS 3 and AS 4) to facilitate different
multiple heat exchanger modules.
and sterilising tomato and strawberry
arrangements and couplings of service
Because of its viscous nature and the
purees.
fluid. The thicker wall on the AS 4 series
number of heat exchanger modules
means that up to 25 bar of pressure can
that may be involved in large-scale
accommodated on the product side
10 FDPP - www.fdpp.co.uk
www.hrs-heatexchangers.com
