High heat transfer coefficients

Because SCHMIDT plate heat exchangers develop extremely high heat transfer coefficients (up to 7000 W/m2 K) they require low surface areas and have low capital cost.

The continuous in-house development programme coupled to basic research work done in cooperation with Universities was and is, the basis of the optimited profiles of our SIGMA heat exchanger plates.

Optimised heat recovery

With high heat transfer coefficients and favourable flow characteristics SIGMA plate heat exchangers designed for counter current flow with product temperature differenes of less than 1”ĘC make heat recovery in excess of 96% technically and economically viable.

Low liquids content

As the gap between two plates is small, a plate heat exchanger contains only low quantites of processed product in comparison to a tubular heat exchanger. The product remains in the plate heat exchanger only for a short time and the process can be easily stopped or the temperatere can be changed quickly with minimum damage to the product. The weight of a plate heat exchanger is considerably less than that of a tubular heat exchanger for the same duties.

Compact construction

The concept of the plate heat exchanger and the special compact construction of SCHAMIDT units allow the housing of large heat exchanging surface areas in a very compact, space-saving frame. In comparison with a tubular heat exchanger with the same performance considerably less space is required and no additional space is necessary for opening the plate heat exchanger.

No missing of the product

The sealing system of the SIGMA heat exchanger plates is designed for double sealing of the flow channels. This prevents the two process fluids from mixing, If there are any leakages at the gasket aroud the plate or the port areas, the leakage is to atmosphere and becomes detectable.

SIGMA-sealing system


Under the gasket groove the heat exchanger plates are reinforced on both sides. The profile on both sides grants an exact placement of the gaskets and a stability of the plate package, especially for large plate types.


With SCHMIDT plate heat exchangers changes to the processing conditions can be readily accommodated. For this purpose the plate arrangement can be changed, plates can be added or removed.

It is possible for the initial calculations of the unit to provide for future operating conditions. It is also possible to install several sections into one frame and permit flow continuity in processes involving several process steps (e.g. pasteurisation). Different products can be processed in different sections within the same unit.

Low fouling

Fouling of the heat transfer surfaces of a SCHMIDT plate heat exchanger is extraordinarily low. This is a result of good product distribution, constant velocity profile and smooth plate surfaces. The high induced turbulence gives a selfcleaning effect which prevents fouling.

Easy maintenance

SCHMIDT plate heat exchangers can easily be mainteained and cleaned. The unit can be cleaned without dismantling by cleaning in place (CIP) systems, by reverse flow cleaning or by addition of suitable cleaning soulutions.

It is easy to inspect the plate surfaces, to regasket plates or to clean them mechanically. Removing the closing bolts makes the plate package easily accessible.

A comparative presentation