HRS Unicus - Scraped Surface Heat Exchangers

Scraped Surface Heat Exchangers

HRS Heat Exchangers designs and manufactures scraped surface heat exchangers for applications where either one or both of the following problems require special solutions: fouling causes heat transfer rates to drop and viscous fluids having very low heat transfer rates.


Fouling is a major problem in heat transfer technology. Fouling occurs when fluids degrade near the tube wall and layers of solids deposit or stick to the tube wall. These layers work as an insulator for heat transfer, causing performance to drop. Another form of fouling is crystallisation where, due to cooling or increasing concentration, components in the fluid change to the solid state and deposit on the heat exchanger surface.

To maintain heat transfer high these fouling layers need removal and that is where scraping of the heat transfer surface is required for optimal performance and increase ‘up time’.


In general, the more viscous the fluid, the lower the heat transfer is. This means that very viscous fluids require a very large heat transfer area. Scraped surface heat exchangers vigorously mix the fluid, which helps to move the fluid to and from the heat exchange surface. This increases heat transfer rates, so the total area required for heat exchange is reduced.


For difficult heat transfer applications, with high viscosities and where fouling can become a problem, the preferred option is a scraped surface heat exchanger. Scraped surface heat exchangers keep heat transfer high and the heat transfer surface is constantly cleaned.

HRS offers two technologies for scraped surface heat transfer: the patented HRS Unicus Series which reciprocates and R Series which rotates, each designed for specific needs.

Reciprocating Scraped Surface Heat Exchangers – HRS Unicus Series
HRS Unicus Series - Scraped Surface Heat Exchangers

Reciprocating Scraped Surface Heat Exchangers – HRS Unicus Series

The patented HRS Unicus Series is a scraped surface heat exchanger specially designed and developed to offer a solution for those difficult heat transfer applications where very viscous fluids are used or fouling appears.

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Rotating Scraped Surface Heat Exchangers – HRS R Series

Rotating Scraped Surface Heat Exchangers – HRS R Series

The HRS R Series is a scraped surface heat exchanger designed for the most difficult heat transfer applications, for example where very high viscosities and highly fouling fluids need heat treatment. Unlike the HRS Unicus Series, where the scraper movement is reciprocal, the HRS R Series technology uses a rotary scraper rod. This scraper rod can…

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