The apparatus was a cylindrical vessel equipped with two blades and baffles, cooled in an ice bath. Use of a scraped surface exchanger prevents the accumulation of significant build up of solid deposits. What is a scraped surface heat exchanger and what does it. Terlotherms scraped surface heat exchanger heat transfer. Contherm scrapedsurface heat exchanger heat transfer solutions for low to high fouling products applications the contherm scrapedsurface heat exchanger sshe has found use within many different processes and applications for manufacturing food, chemicals, pharmaceuticals, cosmetics, health and beauty products, etc. Pdf operation and maintenance manual scraped surface. Litre service scraped surface heat exchanger, sshe repair. Scraped surface heat exchanger is selected to provide optimum performance in each individual application and thus assure that the product is vigorously agitated and continuously removed from the heat transfer wall.
The same process is observed in scraped surface heat exchangers both in theory 37,38 and in the experiment 29,39,40. Its unique design offers impressive flexibility in heating and cooling operations for numerous products, with or without particles. The extremely versatile kelstream scraped surface heat exchanger can be used for all thin, medium and high viscous products. Markets these can be heated and cooled inline in a controlled way. It was found that part of this effect was the result of a change in temperature of the scraped. Contherm is a unique heat exchanger with a tangential in let which means product flows naturally through the heat. This scraped surface heat exchanger easily processes different types products, such as yoghurt fruit, soups, sauces, eggs, fudge or mascara and other products and applications. Pdf the heat transfer coefficient and the power consumption of a laboratory scrapedsurface heat exchanger sshe were measured when it was used for. These heat exchangers are preferred because of their capability to process heatsensitive, viscous, or. It can operate with a wide range of media products. Pdf heat transfer and power consumption in a scrapedsurface. Scraped surface heat exchangers are used for processes likely to result in the substantial deposition of suspended solids on the heattransfer surface. Make fryma koruma, type swtc7, no 100245, new 2008, material stainless steel 1.
In this kind of heat exchanger, the inlet and the outlet are difficult to clean due to their particular. A heat transfer model of a scraped surface heat exchanger for ice cream 541 3. Contherm scraped surface heat exchanger sshe mechinox. The dual rototex dr series scraped surface heat exchangerevaporator is designed to heat, cool or concentrate a wide variety of products particularly highly viscous, proteinaceous or heat sensitive liquids which tend to stick to or foul a heat transfer surface. A heat transfer model of a scraped surface heat exchanger. Pdf effective scraping in a scraped surface heat exchanger. For heating of high viscosity products with or without particles, the scraped surface heat ex changer the sshe is the most suitable heat exchanger. It can be used in a broad range of processing environments, including. Continuous, gentle indirect uht treatment unit with scraped surface heat exchanger for viscous products, with or without particles, that keeps sensitive product in motion.
Operation and maintenance manual scraped surface heat exchanger read and understand this manual prior to installing, operating or servicing this equipment. Scraped surface heat exchanger technology in crystallization. Scraped surface heat exchangers hrs heat exchangers. The trusted brands of apv, gerstenberg schroder and waukesha cherryburrell each serve a multitude of applications allowing spx to meet most any customer demand. Scraped surface heat exchangers mix the fluid vigorously, which increases the amount of fluid coming into contact with the heat exchange surface. Scraped surface heat exchanger were designed to improve upon issues that their predecessors were having problems with. In addition, residence time distribution of product in a scrapedsurface heat exchanger sshe and a holding tube withwithout particulates is discussed.
University of toronto o copynght by alexander chito chong 2001. The kelstream sshe is commonly utilized in aseptic processing of foodstuffs. The seeds scraped from the surface of a sshe get warmed from the stream of product in the machine and, rather than getting a few seeds growing into large crystals, millions of small crystals are produced. A dimensional analysis roberto cuevas authors cuevas, cheryan, and porter are, respectively, graduate research assistant, associate professor of food engineering, and professor assistant, dept of food science, dairy manufactures building, univ. Heat transfer with freezing in a scraped surface heat. This increases the heat transfer rates and reduces the surface area required.
How the contherm scraped surface heat exchanger works. Pyle and others published effective scraping in a scraped surface heat exchanger. See how it works in below animation, showing some of the unique features you will obtain by using a contherm. Scraped surface heat exchangers spx covers the full range of scraped surface heat exchangers sshe from the low pressure to the high pressure ranges. The experiments showed the approach of dimensionless temperature deviated greatly from the theoretical prediction. As product crystallizes on the heat transfer wall, the scraper blades remove it and keep the surface clean. The last resort selection among of the all range of alfa laval heat exchangers for viscous, particulated, sticky and sensitive fluids as a solution maker heating, cooling and evaporation. Scraped surface heat exchanger, newtonian fluid, inner wall temperature, bulk fluid temperature. The contherm max utilizes both an inner and outer heat transfer surface, ensuring a lowshear 2inch 51 mm product path. Alfa laval contherm scraped surface heat exchangers. Suspension melt crystallization in tubular and scraped. Surface heat exchanger under ultra high temperature conditions. Most technologies in direct heat transfer use tubes or flat surface. Armstrong chemtecs continuous scraped surface heat exchanger is a double pipe element that is generally used in cooling crystallization and viscous cooling duties.
The performance of a scrapedsurface heat exchanger is greatly affected by the way in which ice crystallization occurs on the sshes walls e. The dynamic scraped surface heat exchanger dsshe was designed to face some problems found in other types of heat exchangers. Kelstream scraped surface heat exchanger sshe kelstream builds scraped surface heat exchangers for inline cooling or heating of your product. Many prepared food products would quickly foul normal types of heat exchangers, because theyre viscous or sticky, contain particles or alter state when heated. Heat transfer with freezing in a scraped surface heat exchanger. Scraped surface heat exchanger the kelstream scraped surface heat exchanger is a vertical heat exchanger used for inline heating andor cooling of medium to high viscous products. Contherm max scrapedsurface heat exchanger design the contherm max doublewall scrapedsurface heat exchanger sshe features 4. A sshe provides a constant rate of heat transfer because the film at the product wall is continually being scraped away by its blades. The contherm scraped surface heat exchanger range is able to deal with the kinds of products where other types of heat exchangers are known to clog or foul. Borsig process heat exchanger gmbh supplies scraped surface exchangers for any desired throughput and thermal capacity with inside tube diameters of 6 inches, 8 inches, 10 inches and 12 inches.
Principles features scraped surface heat exchanger terlotherm. The votator ii is the newest design of scraped surface heat exchangers. The terlotherm scraped surface heat exchanger sshe has special design features which makes it ideal for heating and cooling products that impair good heat transfer. The leak flow velocity was subcritical and directed opposite to the working chamber displacement. Alfa laval contherm scraped surface heat exchangers abs. Product specifications votator scraped surface heat exchanger components are manufactured in a variety of configurations and materials so that each unit.
The terlotherm scraped surface heat exchanger is available in a range from 0. Hrs heat exchangers designs and manufactures scraped surface heat exchangers for applications where either one or both of the following problems require special solutions. The product is pumped into the lower end of the vertical heat exchanger and flows through the cylinder. Keywords scraped surface heat exchanger, overall heat transfer coefficient, blade. Internal flow field and heat transfer investigation inside.
Unicus can have series or parallel flow configuration depending on the application. Pdf heat transfer with freezing in a scraped surface heat. Scraped surface heat exchangers incorporate an internal mechanism which periodically removes the product from the heat transfer wall. Operation and maintenance manual scraped surface heat exchanger. Alfa laval contherm scrape surface heat exchanger youtube. Tetra pak indirect uht unit pff with scraped surface heat. It is a combination of design features from the proven votator family, thermutator heat exchangers, and new innovations resulting in a rugged, economical, and hygienic heat exchanger that can be used for heating and cooling products of a.
Cleanabilty study of a scraped surface heat exchanger. Thermal analysis of scraped surface heat exchanger used in. Specify a heat exchanger how to specify a heat exchanger. Borsig scraped surface exchanger in the workshop borsig process gas waste heat boiler borsig scraped surface exchanger ready for shipment. Heat transfer occurs across the wall of the inner pipe as the coolant flows in the annulus between the outer pipe and the inner pipe containing the process fluid. Pdf heat transfer with freezing in a scraped surface. It is widely used within the food and personal care industries.
However, the relative complexity of such processes increases the investment costs and the need for maintenance. Operation and maintenance manual scraped surface heat. In scrapedsurface heat exchangers, the product enters the cylinder at the bottom and flows upwards. Two concentric heat exchange surfaces to provide optimum heat transfer.
Design and calculation can be based on the national standards applicable at the place of installation. Contherm scrapedsurface heat exchanger sshe product applications the contherm sshe is particularly suited for processing viscous, sticky or chunky containing particulates products that are to be pumped. Thermal analysis of scraped surface heat exchanger used. They accounted for the thermodynamic pmperties of ice slurry in the development of. The alfa laval contherm scrapedsurface heat exchangers provide consistent heating or cooling of a wide variety of products such as food, healthand beautyaidproducts. The votators superior heat transfer performance and ability to handle a wide range of viscosities makes it the clear choices over tubular or massive plate heat. Scraped surface heat exchangers waukesha cherryburrell pdf.
We supply scraped surface exchangers for each required volume flow and thermal capacity of inner pipe dimensions of 6 inch, 8 inch, 10 inch, 12 inch and any other special size, which might be required. It is a combination of design features from the proven votator family, thermutator heat exchangers, and new innovations resulting in a rugged, economical, and hygienic heat exchanger that can be used for heating and. The three biggest advantages of the terlotherm scraped surface heat exchanger are. Scraped surface and tubular heat exchangers alfa laval contherm the alfa laval contherm scraped surface heat exchanger sshe handles any viscous, sticky andor heatsensitive process fluids as long as they are pumpable.
62 46 1308 1413 1062 64 194 248 1407 1030 678 931 345 1207 1443 275 523 1348 1308 639 534 775 950 1144 485 1163 139 520 1191 187 1223 517 1096 1167 951 535