Plate heat exchangers

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Plate heat exchangers

Plate heat exchangers for industrial purposes

The plate heat exchanger’s unique design provides maximum heat exchange area in comparison to its size. The product range has equipment available in many materials to be able to fulfil our client’s needs from low flows up to flows of 4500 m3/h per unit.

CAMpreq together with SPX APV in Denmark will help you through the process of chosing the model which suits the application best. And we can provide service both on site or in SPX APV’s own work shop in Kolding Denmark when required.

APV plate heat exchangers are available in several different models and designs within these types:

  • Gasket type
  • Semi-welded
  • Brazed type

Gasket type plate heat exchangers

The product range today consists of plates ranging from 0,01 up to 4,6 m2 heat exchange area per plate. Part of the APV product range are equipped with their own developed and patented special “Easy Clip” gasket holders which make gasket replacement much more simple and quick to perform, and without any requirements for adhesives, glues etc.

The plate guide bar has been specially developed to improve weight distribution equally and perfectly straight in order to increase life time and general availability as well as simplify maintenance.

Semi welded plate heat exchangers – for gases or dangerous media

Semi welded plate heat exchangers are used for aggressive media such as H2SO4 or cooling agents such as ammonia or freon.

With its special design by name ParaWeld every second plate is equipped with a normal plate packing and the others are welded with only one o-ring per plate on the product side.

Brazed plate heat exchangers

We have a wide range of compact brazed type plate heat exchangers which are especially suited for heating of water, district heating, gas boiler and sun heating applications. Very commonly used in the district cooling circuits outer end, i.e. in the building towards which the heat exchange is done from the central system grid.

Service and maintenance of many different types and brands

Through APV’s very exprienced and knowledgable service personnel, we can provide first class service both on site or in APV’s own work shop in Kolding, Denmark.

They are able to service not only their own models and brand of plate heat echangers, but also many of their competitor’s models and brands. They stockpile different sizes of plates, gaskets, frames and other parts and have equipment and pressure plates to enable test pressuring of the plate packs before delivery to client.

Gasked type plate heat exchangers are by design very compact and with a large heat transfer surface.

The plates and gaskets can be selected in a number of different materials. It is actually the type of fluid and the performance of the exchanger that is indicative.

To optimize pressure drop and performance, you can choose from a number of different options. You can, among other things, work with the number of passes (see picture below) in the exchanger and angles on the individual plates’ herringbone pattern.

Want to know more about plate heat exchangers?

Johan Stangvik

+46- 31 36 36 128

When configuring plate heat exchangers, it usually ends up in a balance between heat transfer versus pressure drop.

An example is so-called “narrow” plate changer data, where there is a difference of only a few degrees between the hot side’s outlet temperature and the cold side’s inlet temperature. This requires more heat transfer area (more plates), and if the difference between the hot side’s and cold side’s incoming and outgoing temperatures also increases, longer plates are also needed. That is, they will be larger and thus more expensive.

Another problem area may be that, in some cases, there is too little pressure drop across the exchanger. This results in the flow not being high enough to cover the entire heat transfer surface. Something you must also remember is that the pressure drop does not only apply to the heat-transferring surfaces, both the inlets and outlets themselves are affected by pressure drops. As always, these pressure drops depend on the flow rate, which can be calculated using the inlet diameter and the flow.

Coatings are another area that affects heat exchangers in general and plate heat exchangers in particular due to their construction. These can be, for example, limescale deposits, which are common if the liquid is water, or liquids with particles of varying size and characteristics. This is in practice inevitable and is more a question of when it will occur instead of if.

This can often be taken into account when configuring the exchanger, and in these cases do one or more of the following:

  • Take into account coatings through the so-called “fouling factor”, which in principle provides a certain supercooling capacity and extends the time before the need for cleaning.
  • Configure the unit with relatively high “shear stress”, which means that you have higher turbulence between the plates, which in itself has a self-cleaning effect. However, at the expense of a slightly higher back pressure, which is inevitable in that context.

Cleaning can also take place in a “chemical” way through so-called CIP (Cleaning In Place) where the choice of cleaning liquid depends on the type of coating that occurs. The difference between this type of cleaning and purely physical cleaning is that it does not require the disassembly of the plate heat exchanger.

If you choose to clean the heat exchanger by disassembling the plates, you should remember to go through the gaskets carefully as well. It can sometimes even be recommended to replace the gaskets when the plates have been dismantled anyway, to be sure that they will not leak. Always use the manual if you do this yourself. And if you need help with carrying out renovation / cleaning of your plate heat exchanger, we can offer this through various partners.

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