Scraped surface warmth exchangers have been used for difficult heat transfer applications involving viscous fluids or where fouling is an issue, such as evaporation processes. The commonest type of scraped surface heat exchanger (SSHE) makes use of a rotating shaft with blades or augers which scrape the surface of the tube. The well-liked HRS R Series relies on this method. However, the design just isn’t optimal for every situation, and so HRS developed the Unicus Series of reciprocating scraped floor heat exchangers.
The Unicus Series of reciprocating scraped floor warmth exchangers is ideal for viscous merchandise corresponding to cream and tomato juice, in addition to merchandise containing fruit pieces or particles.
The HRS Unicus Series is particularly designed to provide 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 products containing complete pieces of fruits or greens. Over the years, a selection of totally different scraper designs have been developed, which means that every utility, from processing curds to heating sauce or pasteurizing fruit compotes may be dealt with in probably the most environment friendly yet mild way possible. Other functions the place the Unicus Series has been beneficial include dealing with 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 each interior tube. The motion performs two key functions: it minimizes potential fouling by maintaining the tube wall clear and also creates turbulence inside the materials. Together, these actions improve the speed of warmth switch within the material, creating a extremely efficient process that is ideal for viscous and excessive fouling materials.
Since they are controlled separately, the velocity of the scrapers can be optimized for a specific product being processed, in order that materials that are vulnerable to shear stress or pressure harm (such as creams and custards) can be dealt with delicately to forestall damage while nonetheless providing high levels of heat switch. The Unicus Series has proven particularly helpful in handling viscous meals products the place texture and consistency are necessary attributes. For example, some lotions or sauces could shear when subjected to extra stress, making them unusable. The Unicus signifies that effective warmth switch can be carried out at low pressures which overcomes these problems.
Each Unicus SSHE consists of three components: a hydraulic cylinder and power pack (although in smaller units a pneumatic cylinder can be provided instead), a separation chamber to make sure hygiene and preserve product separation from the motor, and the heat exchanger itself. The warmth exchanger consists of a quantity of tubes, every of which accommodates a stainless-steel rod to which the suitable scraping components are fitted. Using pressure gauge วัด แรง ดัน น้ำ of food-safe supplies including Teflon and PEEK (polyether ether ketone), these present totally different inside geometry setups according to the appliance, similar to 120-degree scrapers for big particulates and 360-degree scrapers for viscous fluids without particulates.
The Unicus Series can be fully scalable by growing the shell diameter and adding more interior tubes from a single tube as a lot as eighty in one shell. A key characteristic is the specially designed seals which separate the internal tube from the separation chamber, tailor-made to the product utility. These seals forestall leakage of the product and guarantee inside and exterior hygiene. A normal range of models for food processing provide warmth switch areas from 7 to 107 sq. ft, whereas larger fashions as much as practically 1,300 square toes may be made for specific makes use of.
One space the place the Unicus Series excels is in evaporation purposes, where the prevention of fouling is particularly important. HRS has a specific version of the Unicus for use in evaporation units where volume discount of the fabric is crucial. The scraping motion retains the warmth switch surfaces clean so that Unicus evaporators can concentrate materials to a stage that’s unattainable using conventional applied sciences. Unicus evaporators can be used in multi-effect setups or in combination with mechanical vapor recompression.
Matt Hale is international 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 expertise, providing progressive warmth transfer options worldwide across a diverse vary of industries. With forty years’ expertise in the meals and beverage sector, specializing in the design and manufacture of an extensive range of turnkey techniques and elements, incorporating corrugated tubular, and scraped floor heat exchanger know-how, HRS items are compliant with international design and business standards.For extra data, go to