Reciprocating Action Solves Tough Heat Exchange Challenges

Scraped surface heat exchangers have been used for difficult warmth transfer purposes involving viscous fluids or the place fouling is an issue, similar to evaporation processes. The commonest type of scraped surface warmth exchanger (SSHE) uses a rotating shaft with blades or augers which scrape the surface of the tube. The popular HRS R Series relies on this method. However, the design just isn’t optimum for every situation, and so HRS developed the Unicus Series of reciprocating scraped surface heat exchangers.
The Unicus Series of reciprocating scraped floor warmth exchangers is good for viscous products similar to cream and tomato juice, in addition to merchandise containing fruit pieces or particles.
The HRS Unicus Series is specifically designed to provide the improved heat transfer of a conventional SSHE, but with a delicate action to preserve the quality and integrity of delicate food merchandise corresponding to cheese, yoghurt, ice cream, meat paste, and products containing complete pieces of fruits or greens. Over the years, a number of totally different scraper designs have been developed, meaning that each software, from processing curds to heating sauce or pasteurizing fruit compotes can be dealt with in the most environment friendly yet light means attainable. Other purposes the place the Unicus Series has been helpful embrace dealing with meat slurry and mince, and processing yeast-malt extracts.
The hygienic design uses a patented stainless-steel scraping mechanism that strikes hydraulically backwards and forwards inside every inside tube. The motion performs two key capabilities: it minimizes potential fouling by keeping the tube wall clean and also creates turbulence throughout the materials. Together, these actions increase the rate of heat transfer within the materials, creating a extremely efficient process that’s best for viscous and excessive fouling supplies.
Since they’re managed separately, the velocity of the scrapers can be optimized for a particular product being processed, so that materials that are vulnerable to shear stress or strain injury (such as lotions and custards) can be handled delicately to prevent damage while still providing excessive ranges of heat switch. The Unicus Series has proven notably useful in handling viscous food products the place texture and consistency are necessary attributes. For example, some lotions or sauces might shear when subjected to excess strain, making them unusable. The Unicus implies that effective warmth switch could be carried out at low pressures which overcomes these problems.
Each Unicus SSHE consists of three parts: a hydraulic cylinder and energy pack (although in smaller units a pneumatic cylinder could be supplied instead), a separation chamber to ensure hygiene and preserve product separation from the motor, and the heat exchanger itself. The heat exchanger consists of a number of tubes, every of which contains a stainless-steel rod to which the suitable scraping parts are fitted. Using a range of food-safe supplies together with Teflon and PEEK (polyether ether ketone), these present completely different internal geometry setups in accordance with the applying, corresponding to 120-degree scrapers for large particulates and 360-degree scrapers for viscous fluids with out particulates.
Roadmap can be totally scalable by growing the shell diameter and including more inside tubes from a single tube up to eighty in a single shell. A key function is the specifically designed seals which separate the inner tube from the separation chamber, tailor-made to the product utility. These seals forestall leakage of the product and ensure inside and exterior hygiene. A standard range of models for meals processing provide heat switch areas from 7 to 107 sq. ft, while bigger fashions up to practically 1,300 square toes may be made for particular makes use of.
One space the place the Unicus Series excels is in evaporation functions, where the prevention of fouling is particularly essential. HRS has a specific version of the Unicus to be used in evaporation items where quantity discount of the material is essential. The scraping action keeps the heat switch surfaces clean in order that Unicus evaporators can concentrate supplies to a stage that’s unattainable using traditional technologies. Unicus evaporators can be used in multi-effect setups or in combination with mechanical vapor recompression.
Matt Hale is international gross sales and advertising director for HRS Heat Exchangers. Located in Atlanta, Georgia, HRS Heat Exchangers is part of the HRS Group, which operates at the forefront of thermal technology, offering revolutionary warmth switch solutions worldwide across a various vary of industries. With forty years’ expertise in the food and beverage sector, specializing in the design and manufacture of an intensive range of turnkey techniques and components, incorporating corrugated tubular, and scraped floor heat exchanger technology, HRS items are compliant with international design and industry requirements.For extra information, go to

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