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“R” in the below equation refers to what?

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in Dairy Engineering by (789k points)
“R” in the below equation refers to what?

(a) Recycle

(b) Regeneration efficiency

(c) Regression

(d) Reuse

The question was posed to me during a job interview.

My question comes from Heat Exchangers in division Building Blocks of Dairy Processing of Dairy Engineering

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Right choice is (b) Regeneration efficiency

The best explanation: We can take the simplest operating profile – heat treatment of raw milk –as an example. Using this formula: where R = regenerative efficiency %, tr = milk temperature after regeneration, ti = temperature of raw incoming milk, tp = pasteurization and temperature.

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