Reciprocating Action Solves Tough Heat Exchange Challenges

Scraped surface heat exchangers have been used for troublesome heat switch applications involving viscous fluids or the place fouling is a matter, similar to evaporation processes. The most common kind of scraped floor warmth exchanger (SSHE) uses a rotating shaft with blades or augers which scrape the floor of the tube. The popular HRS R Series is based on this method. However, Efficient isn’t optimum for every situation, and so HRS developed the Unicus Series of reciprocating scraped floor warmth exchangers.
The Unicus Series of reciprocating scraped floor heat exchangers is right for viscous products such as cream and tomato juice, in addition to products containing fruit pieces or particles.
The HRS Unicus Series is particularly designed to offer the improved heat transfer of a traditional SSHE, however with a delicate action to protect the standard and integrity of delicate meals merchandise corresponding to cheese, yoghurt, ice cream, meat paste, and merchandise containing complete pieces of fruits or vegetables. Over the years, a variety of completely different scraper designs have been developed, that means that every software, from processing curds to heating sauce or pasteurizing fruit compotes may be handled in essentially the most environment friendly yet gentle means attainable. Other applications the place the Unicus Series has been useful embody handling meat slurry and mince, and processing yeast-malt extracts.
The hygienic design uses a patented stainless-steel scraping mechanism that moves hydraulically back and forth within every inside tube. The motion performs two key functions: it minimizes potential fouling by maintaining the tube wall clear and also creates turbulence inside the material. Together, these actions enhance the rate of warmth switch within the materials, creating a highly environment friendly course of that is ideal for viscous and high fouling supplies.
Since they are managed individually, the speed of the scrapers could be optimized for a specific product being processed, so that materials which are susceptible to shear stress or strain damage (such as lotions and custards) could be handled delicately to forestall damage while nonetheless offering excessive levels of warmth switch. The Unicus Series has proven notably useful in handling viscous meals merchandise the place texture and consistency are important attributes. For instance, some creams or sauces may shear when subjected to excess pressure, making them unusable. The Unicus implies that effective heat switch can be carried out at low pressures which overcomes these problems.
Each Unicus SSHE consists of three parts: a hydraulic cylinder and power pack (although in smaller models a pneumatic cylinder could be supplied instead), a separation chamber to make sure hygiene and preserve product separation from the motor, and the heat exchanger itself. The heat exchanger consists of a variety of tubes, each of which incorporates a stainless-steel rod to which the suitable scraping parts are fitted. Using a spread of food-safe materials together with Teflon and PEEK (polyether ether ketone), these present totally different inside geometry setups in accordance with the application, corresponding to 120-degree scrapers for large particulates and 360-degree scrapers for viscous fluids with out particulates.
The Unicus Series can also be absolutely scalable by increasing the shell diameter and adding extra inside tubes from a single tube up to eighty in a single shell. A key feature is the specifically designed seals which separate the internal tube from the separation chamber, tailor-made to the product application. These seals forestall leakage of the product and ensure inner and exterior hygiene. A normal vary of fashions for food processing provide heat switch areas from 7 to 107 sq. ft, while larger fashions up to practically 1,300 sq. ft may be made for specific makes use of.
One space where the Unicus Series excels is in evaporation applications, the place the prevention of fouling is particularly important. HRS has a particular model of the Unicus to be used in evaporation units the place quantity reduction of the material is important. The scraping motion keeps the heat switch surfaces clear so that Unicus evaporators can focus supplies to a degree that’s unattainable using traditional applied sciences. Unicus evaporators can be used in multi-effect setups or together with mechanical vapor recompression.
Matt Hale is international sales and marketing 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 know-how, providing innovative warmth switch solutions worldwide throughout a various vary of industries. With forty years’ experience within the food and beverage sector, specializing within the design and manufacture of an extensive vary of turnkey methods and components, incorporating corrugated tubular, and scraped surface warmth exchanger know-how, HRS models are compliant with world design and trade requirements.For extra information, go to

Leave a Comment