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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.

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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