Closed Recirculation

The arrangement for closed recirculation is shown in Fig. 4.40. It over­comes many of the problems encountered with the open system. Typical appli­cations include engine cooling and heat rejection from refrigeration plant.

Advantages

1. Compared with the open system, the average cooling water temperature drop is small, only in the 6-8 °C range.

2. Provided no water losses occur due to pipeline leaks, the cost of water treatment is at a minimum.

Disadvantages

1. Corrosion and fouling will occur, though normally considerably less than that experienced in the open system.

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