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Abstract

In cooling plants which work with water as both primary and secondary coolant, it is customary for use to be made of both an evaporator and a condenser which must be supplied wi5th water in the form of e.g. a spray for achieving an effective heat exchange, and out of regard for the effectiveness it is necessary for a continuous deaeration of the water to be carried out, which is effected by the sucking of air direct from the condenser, possibly supplemented with an external NCG condenser or by leading the supply water through a pre-deaerator under vacuum. With the invention it has been found possible to configure both the evaporator and the condenser with associated deaeration/pre-deaeration units in a fully integrated manner, namely by mounting a pair of sieve plates in a vacuum container for the dividing of the container into an upper supply- and distribution chamber, a centremost pre-deaeration chamber (one or more), and a bottom chamber in the form of an evaporator- and a condenser chamber respectively. From the sieve plates, the water will flow down in many thin jets, which in the deaerator chamber can be pre-deaerated by a moderate suction pressure for independent air separation, while the thin jets introduced into the bottom chamber can create effective heat exchange therein. The exchange of heat can be made additionally effective by use of a jet-breaking insert in the form of e.g. a net in the bottom chamber. The sucking of air from the condenser and from the pre-deaeration stages is arranged with stepwise air concentration units and pumps for minimizing the necessary vacuum pump capacity and energy consumption.

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