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Chemical and Process Engineering Resources

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Category: Heat Transfer Technology
Question: How are plate heat exchangers used in an ammonia refrigeration system?
Keywords: plate,heat,exchangers,ammonia,flooding
Answer: Plate heat exchangers are pretty widely used In ammonia refrigeration systems, and they can be much smaller than the equivalent tubular exchanger. They work best flooded.A flooded exchanger system needs a way to separate the liquid from the vapor. A typical system has a vessel which acts as knockout drum, accumulator and header tank in one, along with the heat exchanger. Liquid ammonia flows from the vessel to the exchanger, and liquid/vapor is returned to the middle of the drum. Vapor is removed from the top of the drum. The liquid/vapor mixture from the exchanger has a lower density than the liquid entering the exchanger, so gravity provides the driving force to circulate the refrigerant.