Groen Process Equipement offers two main styles of heat exchangers / evaporators.

DR Scraped Surface:    
 DR Series 
                        Thin Film:    
 Series 372 & 696 

The DR Series Scraped Surface Heat Exchanger / Evaporator is designed to heat, cool, or concentrate wide variety of products, including highly viscous or heat sensitive products such as caramel. The DR Series achieves extremely high heat transfer rates by incorporating jackets on both the inner and outer walls of a narrow product annulus. This dual-jacketed design provides twice the heat transfer area of conventional scraped surface heat exchangers of the same size. During operation, the inner and outer wall of the product annulus are continuously scraped by rotor mounted blades, which prevents sticking or product scorching. These scraper blades also provide even heat transfer and homogeneity of product during continuous processing batch runs.

The Model DR is sized by height and diameter to your output requirements and concentration needs of the product. See the table below for some of the available sizes and their effective heat transfer area.

Watch GPE Process DR Scraped Surface Heat Exchanger Video

Sized To Your Production Requirements:

Length Heat Transfer Surface Area (ft2)
24" 5.2 12.6

36" 7.9 18.9 28.3 37.7 47.1

48" 10.4 25.1 37.7 50.3 62.8 75.4 88
31.4 47.1 62.8 78.5 94.3 110
37.7 56.6 75.4 94.3 113.1 132

109.9 132 154

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The Groen 372/696 Thin Film Evaporator is designed to concentrate many types of products from as low as 4% solids up to 99.5% solids, with out the necessity of preheating the product or using a vacuum. The Series 372 and 696 units consist of one or more parallel tube concentrator elements. Each tube is dual jacketed to provide a heat transfer surface on both the inner and outer walls of the narrow product annulus. By spreading product feeds in a turbulent, thin film between two heat surfaces, extremely high heat transfer rates can be achieved.

Model 372 evaporator tubes have a 3" diameter product annulus, are 72" long and deliver 9.4 square feet of heat transfer surface area. Model 696 evaporator tubes have a 6" diameter product annulus, are 96" long and have 26 square feet of heat transfer area. Additional tubes can be added to expand production capacity.

Some Typical Production Rates:

End Product Ingredient Feed  % Solids   Lbs/hour* 
 Caramel Corn Coating  sugar, brown sugar, corn syrup, butter 94 - 98 430
 Simple Candy/Syrup  liquid sugar 82 400
Hard Candy sugar / corn syrup 87 360
Sorbital Sorbital gums 99.5 600
Starch Base starch, water condiment varies 1500-2000
*Output for a single 372 tube

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