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Zigzag tube in heat treatment is used for which purpose?(a) Fouling(b) Standardization(c) Holding for a long holding time(d) DiscardThis question was addressed to me by my school principal while I was bunking the class.The query is from Heat Exchangers topic in section Building Blocks of Dairy Processing of Dairy Engineering

Answer»

Correct answer is (c) Holding for a long holding time

The explanation: Correct heat treatment requires that the milk is held for a specified time at PASTEURIZATION temperature. This is DONE in an external holding CELL. A holding cell usually consists of a pipe arranged in a spiral or zigzag pattern and often covered by a metal shroud to PREVENT people from being burned if they touch the holding cell.



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