SONDEX A/S is a Danish company specialised in development, production and global marketing of plate heat exchangers and freshwater generators.

By means of technological innovation SONDEX has developed and designed a new generation of plate heat exchangers and freshwater generators.

With the big range of plate heat exchangers SONDEX has got the optimal technical solution for any possible task, with connection sizes from Ø 15 mm – Ø 500 mm covering a liquid flow of 50 l/hour – 2000 m3/hour. Our product range for freshwater generators covers capacities from 1-100 tons per 24 hours.

Subsidiaries and a global net of highly educated suppliers take care of sale and marketing of our products. The successive product development has made SONDEX a company with a very high growth rate.

The construction of the inlet part makes a perfect distribution of the liquids across the heating surface. The inlet part is increased and supplied with grooves preventing "dead spots" which may cause the growth of bacteria in the plate heat exchanger. The inlet with grooves secures a strong inlet part with a minimum of contact points.

The inlet parts are constructed with a leakage drained zone fulfilling the 3A specifications.

The plate pattern is constructed to obtain a high thermal efficiency. The pattern is available in two designs with different angle sizes giving high respectively low turbulent flow. Combining these in a plate pack an optimal plate composition can be calculated. The angle and fishbone pattern has appeared to make the best heat transmission by a given pressure drop.

In order to strengthen the gasket groove SONDEX "Sonder Flex Line" is supplied with deep steepedged grooves giving a perfect hold of the gasket. This means a long durability for gaskets as well as for plates.

The gasket is placed in the total protected gasket groove. This construction secures the elasticity of the gasket even after long time of clamping. The new generation of Sondex plate heat exchangers is developed with the glueless "Sonder Lock" gasket. The "Sonder Lock" gasket is fixed by strong rubber buttons which contrary to most glueless gaskets of today really fix the gasket in the groove.

Free Flow plates are designed for liquids containing fibres or other particles which may clog up a traditional plate heat exchanger. Sondex Free Flow plates are designed without metal contact between the plates in the liquid area giving a high turbulence and thus a high heat transmission coefficient and especially a long power time.

Semiwelded plates are built up in plate cassettes. A plate cassette is 2 plates welded together by means of laser welding. The advantage by this con-struction is on the one side that a welded space and on the other side a traditional space with gaskets making assembling and cleaning of this side easier. On the welded side there are two specially produced corner hole gaskets creating the tightening between the two cassettes. Thus the gasket is reduced to a minimum on the welded side.

The Sondex Sonder Safe system consists of two thin flow plates stamped together. The two plates form a pair of plates which allows possible leaks to be seen from outside between the two plates. This prevents a mixing of the products and warns about internal leaks.

Contrary to the traditional plate heat exchanger the brazed plate heat exchanger does not contain rubber gaskets and can thus operate continously at the temperatures from minus 180°C up to plus 200°C. The operating pressure can be as high as 30 bar.




Typical applications are:

1. District heating and heating and ventilation
2. Solar heating and airconditioning units
3. Heating pumps and heat recovering units
4. Hydraulic and fuel oil units

This heat exchanger works in the same way as an ordinary tubular unit, however, it is more efficient because plates have been used instead of tubes. The plates are laser/ TIG welded together to form a plate pack, which is then mounted inside a traditional cylindrical shell. Pressure rating: PN16 / PN25. Max temp.: Up to 250°C. The heat exchanger is produced as an all welded exchanger or with flanges as shown on the photo below. This makes manual cleaning possible.

The Sondex Fresh Water Generator utilizes the heat from diesel engine jacket cooling water to produce pure drinkable water by evaporating sea water under high vacuum, enabling the feed water to evaporate at temperatures below 48°C. Steam can also be used as the heat source instead of the hot jacket water.

SONDEX places its many years of experience from heat exchangers at your disposal. You will get the right solution at a competitive price.