JWP - Single StageFresh Water GeneratorThe JWP series converts seawater to freshwater by vacuum

distillation for use on ships and rigs or at remote onshore

locations. This single-stage automatic series is ideal for

capacities from 0.5 to 35 m3/24 h and, upon request, up to

100 m3/24 h.

High quality freshwater

Corrosion­resistant Alfa Laval JWP freshwater generators provide high

quality freshwater with low content of dissolved solids (salinity). This ensures

the supply of pure water, which can be used directly as make­up for steam

boilers.

Long freshwater generator lifespan

To ensure long equipment lifetime, Alfa Laval JWP freshwater generators

come with high­grade, corrosion­resistant materials, such as titanium plates.

Simple freshwater generator installation

Compact and lightweight, Alfa Laval JWP freshwater generators are easy to

install and assemble onsite.

Low operation and maintenance costs

Start­and­forget operation, combined with easy access to the interior,

minimizes man­hours required for operation and maintenance, making Alfa

Laval JWP freshwater generators easy to operate and maintain.

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JWP ­ Single Stage Fresh Water Generator

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JWP freshwater generator range

Designed for automatic operation with continuous control of freshwater

quality, the Alfa Laval JWP freshwater generator range comprises:

Upon request, Alfa Laval can tailor JWP freshwater generators with

capacities up to 100 m3/24 h.

The freshwater generator can be dimensioned to suit any jacket water

temperature from 55° to 95°C and any cooling water temperature required.

The quantity of freshwater produced can be altered simply by varying the

number of plates in the heat exchanger assemblies.

Related industries

How it works

JWP freshwater generator equipment

The Alfa Laval JWP unit consists of a fresh water generator, including titanium plate heat exchangers for evaporator and condenser,

generator shell, two­stage brine/air ejector, freshwater pump, freshwater control sensor and frame.

Operating principle

The feed water to be distilled is taken from the flow of seawater coolant from the condenser outlet (1). It enters the evaporator (10)

where it evaporates at approximately 40° to 60°C as it passes between plates that are heated by the heating medium.

The evaporating temperature corresponds to a vacuum of 85–95%, maintained by the brine air ejector (not shown). The vapours

generated pass through a demister, where any drops of seawater entrained are removed and fall due to gravity to the brine sump in the

bottom of the generator chamber. The clean freshwater vapours continue to the condenser (9), where they condense into freshwater as

they pass between the cold plates cooled by the cooling water.

Additional equipment necessary for operation

JWP­16 freshwater generator for capacities from 0.5 to 10 m3/24 h,depending on the heating medium and cooling water temperatures

JWP­26 freshwater generator for capacities from 4 to 35 m3/24 h,depending on the heating medium and cooling water temperatures

Documents

Product leaflets

Optional freshwater generator equipment

Combined cooling and ejector water pump with electric motor.Manual starter box with motor starters and salinometer (JWP­16 only)Control panel with motor starters and salinometer (JWP­26 only)Anti­scale chemical dosing unit for feed water for heating medium temperatures that exceed 75°C.

Hot water loop module for steam boosting of jacket waterFreshwater pH adjustment (rehardening) filterFreshwater disinfection equipmentExtended control panel with motor starters and salinometer (JWP­26 only)Individual single motor starters and salinometer (JWP­26 only)

Seawater feed1.

Heating medium in2.

Heating out3.

Seawater cooling in4.

Seawater cooling out5.

Freshwater out6.

Evaporated steam7.

Demister8.

Condenser9.

Evaporator10.

Brine out11.

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