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Which heat exchanger used for heating and cooling viscous, sticky and lumpy products?

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Which heat exchanger used for heating and cooling viscous, sticky and lumpy products?

(a) Plate heat exchanger

(b) Tubular heat exchanger

(c) Scraped surface heat exchanger

(d) Spray dryer

The question was posed to me at a job interview.

My doubt is from Heat Exchangers in chapter Building Blocks of Dairy Processing of Dairy Engineering

1 Answer

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Right answer is (c) Scraped surface heat exchanger

The explanation: The scraped-surface heat exchange is designed for heating and cooling viscous, sticky and lumpy products and for crystallization of products. The operating pressures on the product side are high, often as much as 40 bar. All products that can be pumped can therefore be treated.

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