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7/28/2019 Sterilohm
1/2
Ohmic heating units or the ood, dairy and beverage industries
SterilOhm
Application
The SterilOhm heating units rom Ala Laval Astepo are based
on a unique technology that uses an electric current to ensurerapid uniorm heating o pumpable ood and beverages. Ohmic
heating technology is especially useul in conjunction with the
pasteurization or sterilization o products containing large parti-
cles in cases where it is essential that the nal product retains its
nutritious values, vitamin content and taste.
SterilOhm heating units are widely used in processing o a
wide variety o ruits and vegetables, prepared oods, cheese,
liquid eggs, ready-to-eat dishes, sauces, juices, etc.
Design
The SterilOhm unit has a power capacity o 60 kW ((80
HP) and can be combined in series with up to 5 units or
heating inputs in greater volumes. Each SterilOhm unit
consist o a transormer, annular electrodes and sotware
that automatically adjusts voltages to match dierent product
conductivities. The pipework consist o lengths o insulated
Pyrex or Tefon pipe with an uniorm diameter o 1-4 inches
(25,4-101,6 mm) which ensures an unobstructed product
throughfow. Depending on product viscosity and the size o
any particles present in the product being heated, SterilOhm
units are available or mounting either horizontally or vertically.
In order to secure the requested heat treatment, the outlet
temperature is sel-regulated once set. SterilOhm units can
be delivered as complete integrated system in a processing
line with pumps aseptic cooling sections, automation control
systems, aseptic tanks, etc. to comply with individual
customer specications.
Working principle
The pumpable ood product is lead into the insulated pipe
where it is heated up to the required temperature via two
electrodes (+ and -) that transer the electrical current to
the product. Due to the electrical resistance o the product
and the resultant Joule eect, the electricity heats up all the
product being held inside the pipe, at the same time. This
means the heating eect is uniormly distributed throughout
all the material within the length o pipe, regardless o the
specications and characteristics o the product.
The benets o SterilOhm heating units include:
Heatingtheentirevolumeoftheproductatthesametime
ensures that the the carrier liquid and any particles are heated
at the same rate, thus preventing any over- or undercooking
Therapidheatingandlowpressureensurestheintegrityof
any particles within the product
Thegentlenessoftheheatingprocessthatmakessurethe
end-product retains its nutritious values, vitamins, colour
and taste
Accurate,rapid-reactingtemperaturecontrol
Noneedforlonglengthsofpipingandhigh-pressurepumps
reducing the cost and complexity o heating installations
Easycleaninginbetweenstart-ups.
Complete processing line with SterilOhm heating unit, automated control unit, pumps, aseptic cooling section and tanks.
7/28/2019 Sterilohm
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PFT00411EN1108
How contact Ala Laval
Up-to-date Ala Laval contact
details or all countries are
always available on our website
at www.alalaval.com.
Ala Laval reserves the right to change specications without prior notication.
Note:TheowratedependsonDeltaT.AlfaLavalAstepocanprovidespecicestimates/capacitymodulesonrequestbasedoneachclientsdataforproductdetails, needed capacities required, etc.
Balance
tank
SIP cooler
+ - +
+ - +
Holding
Heating
Ohmic heaterPump
Cooling media
Cooling media
Treated product out
Cooling
Cold
water
Cooling media
Product in
Specications
Schematic fow diagram or an Ohmic heating installation
120 kW SterilOhm unit in horizontal conguration or use with products containing
particulates.
30 kW SterilOhm pilot unit in vertical conguration or use with
viscous products. As an option vertical units can also be supplied
with a Swep surace system (patent pending) or products where
ouling can be a problem.
SterilOhm Ohmic pilot SterilOhm 1 SterilOhm 2 SterilOhm 3 SterilOhm 4 SterilOhm 5
Power capacity 30 kW (40 HP) 60 kW (80 HP) 120 kW (160 HP) 180 kW (240 HP) 240 kW (320 HP) 300 kW (400 HP)
Power supply 400V 50Hz 400V 50Hz 400V 50Hz 400V 50Hz 400V 50Hz 400V 50Hz
Output 20 KHz 20 KHz 20 KHz 20 KHz 20 KHz 20 KHz