The scraped surface heat exchangers consist of a jacketed cylinder with a rotating dasher holding rows of scrapper blades. A unique Heat Exchanger is specifically designed for processing thick, high viscosity materials and for heat exchanging a variety of specially heat sensitive products like fruit pulps of mangoes, papayas, guavas, peaches and juice concentrates. The product is pumped through the cylinder while the heating or cooling medium is circulated between the cylinder and the jacket. The medium can be steam, water or a refrigerant. The continuous scraping action exerted on the heat transfer surface ensures uniform heating of the contents and prevents product fouling/burn-out. It is also heavily used for materials that solidify at the wall temperatures. The Rotary Scraped Surface Heat Exchanger consists of a stainless steel tube, suitably jacketted in a carbon steel jacket insulated from outside and covered with stainless steel sheathing. The stainless steel centre shaft of the heat exchanger is fitted with teflon scrapers which scrape the internal surface of the heat exchanger continuously. The positive displacement pump ensures constant product infeed. Cleaning procedures for these units are simple and easy at the end of a run, without any need to dismantle the product contact parts for inspection. The unit is complete with motor and necessary fittings. Optional extras included with these fittings are starter, temperature controller and recorder, and automatic product flow control. Depending upon the capacity requirement, multiple units can be supplied in series or parallel working arrangement. Heat Exchangers can also be used as an efficient product cooler, by using a suitable coolant. With appropriate modifications such as addition of necessary flash chamber, barometric/semi-barometric condenser with vaccum pump, etc., the heat exchanger can also be used as a thin film evaporator mainly for concentration of thick, viscous, delicate and heat sensitive products.