Definition - What does Recirculation mean?

Recirculation is the reintroduction of fluid into a cycle of circulation. It reduces the cost of operations and increases efficiency.

Water recirculation is the processes of using the same water more than once in a system. The water must leave the system and re-enter it or be used in a different system. Water recirculation reduces the need to take in new water.

Corrosionpedia explains Recirculation

Recirculation is circulating something again for reuse, or recycling to minimize process cost and increase efficiency. For example, recirculating water is a way of reducing the load of organic waste in the water and of increasing the amount of oxygen in the water. Effluent is treated in a wastewater treatment plant through recirculation, where it is piped back to the beginning of the treatment process and added to the raw wastewater.

A recirculation pump can be used in a system to ensure that hot water is always available as close to the consumption point as possible, in order to reduce water wastage and to increase comfort. A recirculation system can save thousands of gallons of fresh water annually.

All cooling towers offer the potential for recirculation, the extent of which depends primarily upon the entering and exiting air velocities, and their relationship to each other. Higher entering velocities increase the potential for recirculation, while higher exit velocities decrease its opportunity.

Recirculation is very important in many systems where water recirculates through the cooling pipes for absorbing heat so that system can run uninterrupted, like:

  • Air conditioners
  • Refrigerators
  • Heat exchangers

Recirculation is very common in industrial and mining applications. In mining industries, almost all of the recirculated water (98%) is used for process activities. In thermal-electric power, the recirculation rate is 16%.

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