Electric Heat Exchangers0 pages

HEAT EXCHANGERS
Application: Heating of Forced Convection Fluids

Figure 1: Typical Sketch of an electrical heat exchanger

GENERAL CHARACTERISTICS

TECHNICAL DATA

Heat Exchangers are the best solution to heat fluids
flowing in forced convection.
Electrical Heat Exchangers operate in the same way
as fluid/fluid heat exchanger but the hot side
consists of armoured electrical heaters in direct
contact with the fluid to be heated. An optimum heat
exchange is obtained employing appropriate baffles
whose design is tailored to exploit at best the heat
released by the electrical resistances.

Heat Exchanger can be manufactured with carbon
steel or stainless steel shell:
1
2
3
4
5-6

(see also Figure 1)

Power supply cable inlet
Eyelets for heat exchanger hoisting or moving
Supporting frames for mechanical fixation
Thermal insulation (if requested)
Drain connections

Thanks to the specific characteristics of the heaters,
the Electrical Heat Exchangers are very compact in
size and support a very precise control of the fluid
outlet temperature. These systems, in fact, are
characterised by a minimum thermal inertia of the
hot side of the exchanger, thus providing a very fast
response to the process needs and a finely
controlled outlet temperature. This is especially true
if SCR’ (Solid Control Relais) are employed in the
s
control system.
These products are designed by our technical
department on the basis of customer provided
functional requirements. Design is supported by
purpose-developed software that allow both the
definition of the design parameters and the
verification of the corresponding thermodynamic
performances. The analysis yields a precise picture
of the heat exchanger operating conditions. The
iteration between design and analysis lead to define:

Fluid Electric Heaters

If requested by customer specifications, mechanical
verification
calculations,
for
the
structurally
significant parts (coupling flanges and shell), are
provided in the frame of the order. They fulfil the
requirements of European (PED 97/23/EC),
American (ASME VIII div.1) and are executed
following national (VSR, AD2000, etc.) standards.

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Issue 2004

1. the specific power
2. the requested number and type of baffles as well
as the resulting pressure drops
3. the maximum sheath temperature and,
consequently, the safety devices to be used
4. the materials to be used in the construction
5. The heat exchanger main dimensions
6. the thermodynamic behaviour of the heat
exchanger in the different operational conditions
that are foreseen

The manufacturing experience built up in several
years of operation in the market, copying with the
most different applications, enables us to suggest to
our customers materials and technical solutions
which are best suited to the application of interest.
The results of the thermodynamic calculations,
performed to prove the capability of the heat
exchanger to operate as requested, are provided
already as part of the offer.